Decrease In Filtration Rate Research Articles

Evaluation of shell powders of bush mango and hamburger bean as eco-friendly fluid loss control additives in water-based drilling mud

The use of agro-based additives in drilling mud to reduce fluid loss and improve the rheological properties of mud has gained enormous attention owing to its biodegradability and low cost. This study evaluates the effects of shell powders of hamburger bean and bush mango as eco-friendly and cheap filtration control additives in water-based mud. Samples were formulated with different concentrations (5 g, 10 g, 15 g, and 20 g) of the shell powders to determine their effects on the filtration and rheological properties of the mud. From the results, both hamburger beans and bush mango shell powders improved the rheological properties of the fluid. Meanwhile, only 15 and 20 g of Bush mango shell powders reduce fluid loss by 10.5 and 13.2%, respectively. Similarly, the addition of 5 g, 10 g, 15 g, and 20 g of hamburger bean shell powders reduced fluid loss by 1.4, 8.82, 14.71, and 20.6%, respectively. Both Bush Mango and Hamburger Beans shell powders based mud produced cake thickness between 1.2 and 1.8 mm. The research demonstrates that Hamburger Beans shell powders provides a progressive decrease in filtration rate as the content increases, and it stand as a cheap and eco-friendly alternative additive for the enhancement of rheological and filtration properties in water-based drilling fluids.

Spatial and Temporal Variability in Bioswale Infiltration Rate Observed during Full-Scale Infiltration Tests: Case Study in Riga Latvia

Urban nature-based solutions (NBSs) are widely implemented to collect, store, and infiltrate stormwater. This study addressed infiltration rate as a measure of the performance of bioretention solutions. Quick scan research was conducted, starting with mapping over 25 locations of implemented green infrastructure in Riga, Latvia. Basic information, such as location, characteristics, as well as photos and videos, has been uploaded to the open-source database ClimateScan. From this, eight bioswales installed in the period 2017–2022 were selected for hydraulic testing, measuring the infiltration capacity of bio-retention solutions. The results show a high temporal and spatial variation of infiltration rate for the bioswales, even those developed with similar designs: 0.1 to 7.7 m/d, mean 2.0 m/d, coefficient of variation 1.0. The infiltration capacity decreased after saturation: a 30% to 58% decrease in infiltration rate after refilling storage volume. The variation in infiltration rate as well as infiltration rate decrease on saturation is similar to other full-scale studies done internationally. The infiltration rate of most bioswales falls within the range specified by international guidelines, all swales empty within 48 h. Most bioswales empty several times within one day, questioning the effectiveness of water retention and water availability for dry periods. The results are of importance for stakeholders involved in the implementation of NBS and will be used to set up Latvian guidelines for design, construction, and maintenance.

An Evaluation of the Relationship between Membrane Properties and the Fouling Mechanism Based on a Blocking Filtration Model

Microfiltration plays an increasingly important role in various fields. Consequently, elucidating the mechanism of membrane fouling has emerged as a pivotal issue that needs to be resolved. In this study, a blocking filtration model was employed to evaluate the effects of membrane properties on the fouling mechanism during the microfiltration of representative polysaccharides, namely sodium alginate, pectin, and xanthan gum. Microfiltration membranes composed of hydrophilic and hydrophobic PVDF, mixed cellulose ester, as well as hydrophilic and hydrophobic PTFE were used as filter media. The flux decline behavior was significantly affected by the membrane properties, with hydrophilic membranes exhibiting a slower decrease in filtration rate. The model analysis revealed a correlation between the blocking characteristic values and the membrane properties. Although the blocking index n showed membrane material dependence, the values of this parameter remained consistent across various filtration conditions, including the wettability of the membrane surface, solute concentration, and pressure (pectin: n = 1.86, 1.85, 1.50, and 1.50 for hydrophilic PVDF, hydrophobic PVDF, hydrophilic PTFE, and hydrophobic PTFE, respectively). The resistance coefficient k was influenced by the characteristics of the membrane surface; the k values of the hydrophobic membranes were higher than those of the hydrophilic ones (pectin: k = 0.00084, 0.00725, 0.00714, and 0.0384 s1−n/cm2−n for hydrophilic PVDF, hydrophobic PVDF, hydrophilic PTFE, and hydrophobic PTFE, respectively). The model calculations, based on the values of n and k, demonstrated a relatively good agreement with the experimental data.

Tire particles and their leachates reduce the filtration rate of the mussel Mytilus edulis

Microplastics (MPs) are found in aquatic environments all over the world. Among MPs, tire wear particles (TWPs) are a major contributor to microplastic pollution, and their effects on marine ecosystems are of emerging concern. The blue mussel (Mytilus edulis) is a keystone species in coastal ecosystems with a high risk of exposure to microplastic pollution as the microplastics often overlap in size with the plankton consumed by mussels. In the present study, we investigated the effect of tire particles and their leachates on the filtration rates of M. edulis after short (72 h) and long-term (3 weeks) exposure. Acute exposure to leachates alone causes a significant decrease in the filtration rates of M. edulis with a low observed effect concentration (LOEC) of 1.25 g L−1 and a median effect concentration (EC50) = 3 g L−1. At a concentration of 1.25 g L−1, the filtration rate was reduced compared to the control on average by 38% when mussels were exposed to either TWP or leachates for 72 h. Similarly, mussels exposed to tire particles or their leachates for 3 weeks showed a 46% reduction in filtration rates, compared to the control group. A non-significant difference in filtration rate decrease was found between leachates alone or TWP, which indicates that leachates are the main responsible for the observed toxicity. Our findings indicate that elevated levels of TWP pollution can cause an adverse impact on M. edulis. This could disrupt the natural grazing pressure exerted by M. edulis on phytoplankton, potentially leading to an increased likelihood of algal blooms and hypoxia occurrence in coastal ecosystems.

Multi-biomarker approach for the (eco)toxicity of UV-filter environmental pollution on the Mediterranean mussel Mytilus galloprovincialis in a multiple stressor context. The case of 4-MBC under salinity shifts.

Marine-coastal ecosystems are rapidly transforming because of climate change (CC). At the same time, the impacts of emerging organic contaminants (i.e., organic UV-filters) on these ecosystems are intensifying. In the Mediterranean, the consequences of these disturbances are occurring at a fast pace making this area a potential sentinel site to be investigated. While singular effects of organic UV-filters or CC-related factors on marine biota have been relatively described, their combined impact is still largely unknown. Thus, the objective of this study was to assess the long-term responses of the Mediterranean mussel Mytilus galloprovincialis towards anticipated salinity changes (decreases-S20 or increases-S40) when exposed to environmentally relevant concentrations of the UV-filter 4-methylbenzylidene camphor (4-MBC). An integrated multi-biomarker approach was applied, featuring general and oxidative stress, antioxidant and biotransformation enzyme capacity, energy metabolism, genotoxicity, and neurotoxicity biomarkers. Results showed that both projected salinities, considered separately, exerted non-negligible impacts on mussels' health status, with greater biological impairments found at S 40. Combining both stressors resulted in an evident increase in mussels' susceptibility to the UV-filter, which exacerbated the toxicity of 4-MBC. The dominant influence of salinity in the climate change-contaminant interaction played a crucial role in this outcome. The most severe scenario occurred when S 20 was combined with 4-MBC. In this situation, mussels exhibited a decrease in filtration rate, metabolic capacity and deployment of energy reserves increased, with an upregulation of biotransformation and inhibition of antioxidant enzyme activities. This exposure also led to the observation of cellular and DNA damage, as well as an increase in AChE activity. Furthermore, salinity-dependent bioaccumulation patterns were evaluated revealing that the lowest values in contaminated mussels are found at S 20. Overall, the present findings provide evidence that projected CC/pollutant scenarios may represent high risks for mussels’ populations, with global relevant implications for the ecosystem level.

Effects of Soil Particle Structure on the Distribution and Transport of Soil Water and Salt

Unsaturated zones are critical for water and material exchange between groundwater and surface ecosystems. Understanding the migration patterns of soil water and salts in these zones can offer theoretical support for maintaining the equilibrium between groundwater and surface ecosystems in Northwestern China’s salinized regions. This study explores the correlation between soil particle composition and soil water and salt distribution at a test site in the lower reaches of the Shiyang River basin. It analyzes the way in which water and salt patterns vary with different soil structures over various timescales. The results indicate that lithological profiles with similar structures but varying fine particle contents exhibit distinct water–salt variation patterns. Higher fine particle content leads to increased water and total dissolved solid content, but a decreased infiltration rate. When the middle layer has the highest fine content, soil evaporation is partially inhibited. The more complex the lithologic structure, the less effective irrigation is in leaching salt. However, when the lithologic structure remains constant, fine particle content has minimal impact on salt leaching.

Screening for renal impairment in viral hepatopathy B: it is time to begin.

The aim of this study was to assess the value of routine screening for renal damage in cases of B viral infection, by looking for proteinuria and elevated creatinemia. We investigate the frequency and associated factors of renal impairment in patients with viral B hepatopathy. Pathological albuminuria was confirmed in 44.73%. The chronic kidney disease with slightly decreased filtration rate was found in 21.05%. In multivariate analysis, only BMI was an independent factor for pathological albuminuria (p=0.013) and only age was an independent predictor of chronic kidney disease (p=0.056). Urine dipstick and creatinemia are useful for routine screening in viral B hepatopathy especially in the elderly and overweight.

Biochemical and behavioral effects of zinc oxide nanorods on the freshwater mussel Potomida littoralis

ABSTRACT Our study aimed to investigate the impact of nano-zinc oxide (nZnO), a widely used pollutant in industry, pharmaceuticals, and personal care products, on the behavior and oxidative stress of freshwater mussels (Potomida littoralis) an indicator species and also a model non-target organism in ecotoxicology. To this end mussels were exposed to nZnO (50 and 100 µg/L) and Zn2+ from ZnSO4 (50 and 100 µg/L) for 7 days. ZnSO4 was used for comparison purposes and to determine if the toxicity of nZnO was due to the release of ions into the aquatic environment. We evaluated changes in oxidative stress markers, including catalase (CAT), glutathione-S-transferase (GST), acetylcholinesterase (AChE), and malondialdehyde (MDA) levels, on the mussel gills and digestive glands. Additionally, the effect of nZnO on the filtration rate of bivalves was studied. The findings showed that the mussel tissue’s different parameters were significantly affected by exposure to various concentrations of nZnO, causing changes in their behavior that led to a decrease in filtration rate. Additionally, noteworthy increments were observed in CAT activity, AChE activity, and MDA levels, whereas GST activity displayed a decreasing trend, implying that oxidative stress contributes to the toxicity of nZnO. The purpose of this review is to present a framework for comprehending the toxicological impacts of nanoparticles from an environmental standpoint. Additionally, it includes novel information about the connections between nanoparticles (NPs) and bivalve species.

Residential Building Energy Conservation in Mediterranean Climate Zone by Integrating Passive Solar and Energy Efficiency Design Strategies

Residential buildings have a list of functions, and one of the top priories is the thermal comfort of its occupants. Thermal comfort can be one of the measurements of successful building performance, and it can be addressed in various ways to provide a good quality indoor climate. The way to address the need for thermal comfort determines the consumption and conservation of energy. Adapting passive strategies and thermal mass to a building can reduce energy consumption significantly. Applying these strategies to a building does not need additional investment from the initial capital, and renovating a building to implement the strategy will cut the energy usage of a building and save the additional financing of new technology for heating and cooling, ventilation, and so on. In this study, two residential buildings located in North Cyprus with the same geographical location, climate zone, and different construction materials were studied. The study aimed to make a technical test to reduce energy consumption and improve energy conservation in the building by applying passive solar and energy efficiency design strategies (PSEEDS). The thermal mass has been used and discussed as an improbable energy technique alongside other insulation materials and shading devices. The article discusses and compares the energy consumption and thermal comfort of traditional Mediterranean houses with contemporary houses. The study uses 2D drawings, 3D modeling, and energy simulation programs to evaluate energy consumption in both real and assumed scenarios. The study finds that traditional Mediterranean homes, with their thick walls and built-in shading mechanisms, require less energy for heating and cooling than contemporary houses. The implementation of passive solar energy efficient design strategies (PSEEDS) significantly reduces energy consumption in both types of houses, but traditional Mediterranean houses still show more efficiency due to their higher thermal mass. The research demonstrates that improving windows, examining the orientation of the structure, altering shade devices, and decreasing infiltration rates can reduce overall energy consumption by up to 34.71% To sum up, in this study, PSEEDS, the performance of thermal mass, and pre-design measures significantly decrease energy consumption. In addition, implementing passive strategies during a renovation of a building also compensates for the investment and lifecycle cost of new technologies and energy usage.

ANALYZING THE EFFECTS OF LAND USE / COVER CHANGE (LULCC) SIMULATION ON FLOODING: A CASE STUDY IN LAS NIEVES, AGUSAN DEL NORTE, MINDANAO, PHILIPPINES

Abstract. The municipality of Las Nieves, located in Agusan del Norte, Mindanao, Philippines, has experienced floods and flood-related damages in the floodplain region in recent years. Despite the best intentions of planning and implementing projects anchored in its comprehensive land use plans, recurring flooding significantly impacts its residents. Due to its growing population, changes in land cover are inevitable. The changes can result in increased overland flow and decreased infiltration rates. This study was conducted to determine and quantify the effect of changing the land use/land cover (LULC) on the flooding condition in the municipality. Base LULC map was generated using Sentinel-2 image captured in 2021. Support Vector Machine classifier was used in the classification resulting in an accuracy of 94.07%. The 2021 LULC map was the reference for predicting future LULCs for 2025 and 2029 implemented in MOLUSCE and was utilized for flood simulation. HEC-HMS and HEC-RAS were used to generate flood depth maps of different extreme rainfall scenarios. The results showed that as the rainfall event increased, the extent of affected LULC areas also increased. Based on the rainfall impact assessment results, the annual cropland was the most impacted LULC class across the various LULC classes. The class open forest is the least affected class for 2021, 2025, and 2029. However, the barren was the least affected in the scenario-based build-up increase. These assessments are especially pertinent because storm-related rains have been increasingly severe recently and will continue due to climate change. The simulations and flood mapping knowledge can inform and empower the Local Government Unit of Las Nieves. It will guide them in developing informed decision frameworks for mitigating significant land surface variabilities and adapting effective future land use plans to reduce the adverse effects of flooding.

Influence of rheology in the filtration of leach slurry generated by alkaline pressure leaching of a limestone ore

The Nuclear Power Plant, which uses uranium as a fuel, is considered as a clean source of energy with low carbon footprint and less environmental damage. In processing the uranium ore, the filtration of alkaline leach slurry generated by oxidative pressure leaching is a challenge due to very fine grind size coupled with high total dissolved solutes (TDS). The present study aimed at improving and understanding the filtration of the leach slurry with the help of slurry rheology. The effect of solid concentration, temperature, particle size, and dosages of dewatering aids on the rheological behavior of the slurry and the filtration performance was investigated. The slurry rheology was delineated by the Herschel–Bulkley model, temperature effects were incorporated using the Arrhenius type model, and particle size distribution (PSD) was represented by the Rosin–Rammler PSD model. The dosages of dewatering aids were compared using rheological parameters. It was found that the filtration rate decreases as solid concentration increases (10 to 75%, w/w) due to an increase in the shear stress (9.93 to 757 Pa at 1400 s−1). The leach slurry showed shear thickening at ≤ 60% solids (w/w) and shear thinning at ≥ 70% solids. The maximum solid packing volume fraction was found to be 0.59 and 0.54 at 1300 and 441 s−1, respectively. Increase in filtration rate was observed at elevated temperatures as the apparent viscosity (at 1300 s−1) decreased from 0.0195 Pa.s at 20 °C to 0.0135 Pa.s at 70 °C. The fluid flow activation energy was determined to be 5.5 and 7.1 kJ/mol at 1110 s−1 for 50 and 73% solid concentration (w/w), respectively. When the particle size (d90) was changed from 66 to 42 µm, a decrease in filtration rate was observed due to an increase in apparent viscosity from 0.0120 to 0.0163 Pa.s at 1400 s−1. The high molecular weight polyacrylamide based non-ionic synthetic flocculant N 100 and non-ionic biodegradable polysaccharide surfactant guar gum formed flocs through the bridging mechanism and gave best flocculation results, and therefore selected. The present work helps the researchers in better understanding and improving the filtration process of ore slurries.

The resemblance between flow patterns in submerged or open-to-air outlet hydrophobic capillary tubes and water infiltration in hydrophobic porous media

• Similar infiltration patterns were found for a hydrophobic capillary tube and porous media. • A convex-shaped meniscus propagation was observed along a hydrophobic capillary tube at a low water driving head. • Modified Lucas-Washburn equation failed to predict the invasion of a hydrophobic tube at low inlet pressure. Porous media (PM) flow is essential in many natural and industrial processes. The PM can be either hydrophilic or hydrophobic, substantially affecting its imbibition and flow. As opposed to a decreasing infiltration rate with time (concave shape) in hydrophilic PM, an increasing rate with time (convex shape) has been observed in hydrophobic PM. A commonly accepted mechanism to explain the convex infiltration pattern is still lacking. The current study elucidates the latter by focusing on flow in hydrophobic capillary tubes under different boundary conditions. A convex-shape meniscus propagation in a hydrophobic capillary tube was observed for low ponded water depth at the tube inlet, whereas a concave shape propagation was observed for high ponded water depths. To the best of our awareness, such a finding is innovative. Once the meniscus reached the tube outlet, the hydraulic conductivity of the hydrophobic tube depended on the driving head for an open-to-air outlet while having a constant value for a submerged one. The saturated hydraulic conductivity for an open-to-air capillary tube depends on the ratio between ponded water depth and tube water-entry head, R 0 , and reaches a constant value measured for a submerged tube for R 0 > 20.8. While successfully predicting the wetting-front propagation for R 0 > 20.8, the modified Lucas-Washburn (LW) equation with slip boundary condition failed to predict the convex infiltration patterns. The observed infiltration patterns in hydrophobic porous media in general and soils in particular, seem inherent since capillary tubes are fundamental units in such media. Moreover, flow in PM has been frequently modeled using a bundle of nonuniform capillary tubes. The failure of the modified LW equation to predict the measured data for R 0 < 20.8 calls for a new approach to model water flow in hydrophobic tubes and PM.

Effect of LULC changes on surface runoff in Brahmani river basin using Soil and Water Assessment Tool (SWAT)

Understanding the rainfall-runoff process is critical for estimating water availability. The study's major goal is to use a hydrological model (Arc SWAT) to calculate an estimate and surface runoff the influence of LULCC (Land Use Land Cover Changes) in the Brahmani River Basin from 1983 to 2019. Two distinct loss models were used to simulate runoff: the Green-Ampt model (GA) and the Soil Conservation Services Curve Number (SCS-CN) model. As input data to the model, different maps such as the elevation map, drainage map, slope map, land cover map/land use, and soil map of the watersheds are created using GIS technologies and remote sensing. At five observing stations in Keonjhar, Swampatana, Rengali, Akhuapada, and Indupur, the runoff was simulated. Due to a decrease in infiltration rate, runoff increased by 6.06 percent during this period. In the SCS-CN and GA approaches, the coefficient of determination (R2) is 0.89 and 0.87and the Nash-Sutcliffe efficiency (NSE) is 0.86 and 0.85, respectively, when comparing observed and calculated data. In the Brahmani River Basin, the SCS model performed better than the GA model.

Leading Factors of Progression in Patients with Cardiac Amyloidosis

Aim. To describe prognostic meaning of cardiac and other principal clinical manifestations of systemic AL-amyloidosis in their interrelations.Material and methods. It has been made long-time survival analysis of 147 patients with systemic AL-amyloidosis. In the special investigation group (n=58) of AL (n=55) and ATTR (n=3) amyloidotic cardiopathy patients there were evaluated prognostically important structural and functional changes in myocardium with standard and impulse-wave tissue dopplerometric echocardiography in comparison with NTproBNP serum levels.Results. Even though significantly increased nowadays surviving of AL-amylodotic patients (Me=90 months) it has been found that as at previously time orthostatic hypotension and amyloid cardiopathy are being most severe initial syndromes (median 25 months), but after 1 year from diagnosis influence of these syndromes on surviving had decreased and most low surviving was more common in patients with CKD 3-5 (median 28 months). Influence of CKD 3-5 on surviving was associated predominantly with intracardial hemodynamics deterioration. Together with decreased systolic shortening strain rate (48,5%) decreased filtration rate (47,9%) was second of main factors contributing into NTproBNP increasing in effective multiple regression model (R=0,702, F(4,21)=5,095, p=0,005). NTproBNP level in less degree depended on renal clearance.Conclusion. Heart damage is one of the most prognostically unfavorable manifestations of systemic amyloidosis due to a sharp deterioration in the elastic properties of the myocardium, in the process of further development of amyloidosis, the leading factor in progression is the deterioration of the profile of cardiorenal interactions, the marker of which is the level of NTproBNP.

GAMBARAN DUKUNGAN KELUARGA TERHADAP KEPATUHAN PASIEN GAGAL GINJAL KRONIK MENJALANI HEMODIALISIS DI RSUP HAJI ADAM MALIK MEDAN TAHUN 2021

Chronic kidney failure is kidney damage that causes the kidneys to be unable to remove toxins and waste products from the blood, characterized by the presence of protein in the urine and a decrease in the glomerular filtration rate, lasting more than 3 months. Family support is an attitude of action and family acceptance of supportive family members who are always ready to provide help and assistance if needed, in this case the acceptance of family support will know that there are other people who pay attention, appreciate and love them. Obedience is obedience or disobedience to orders, rules and discipline. Changes in individual attitudes and behavior start from the stage of compliance, identification, then internalization. Hemodialysis is a life-saving procedure performed by nephrology nurses to patients with impaired kidney function. The purpose of the study was to determine the description of family support for patients undergoing hemodialysis at Haji Adam Malik General Hospital Medan in 2021. This study used a descriptive method. The population in this study were all patients with chronic renal failure undergoing hemodialysis. The sampling technique used was consecutive sampling as many as 74 respondents. The results of research conducted at Haji Adam Malik General Hospital Medan as follows: family support for chronic kidney failure patients undergoing hemodialysis at Haji Adam Malik General Hospital Medan are mostly good categories as many as 70 respondents (94.6%), chronic kidney failure patient compliance in undergoing hemodialysis at Haji Adam Malik General Hospital in Medan, most of the good categories were 48 respondents (48.9%). Family support for patients and patient compliance with hemodialysis are in the good category, strongly supported by education because the higher a person's education, the faster he understands about the condition of the disease he is experiencing.

Evaluation of changes in the content of biochemical parameters and protein fractions in blood serum of workers employed at an enterprise for underground mining of chrome ores

Underground mining of chrome ores is characterized by constant exposure to chemical factors on production workers, which leads to the occurrence of pathological changes on the part of critical organs and systems. The aim of the study is to assess changes in the content of biochemical parameters and protein fractions in the blood serum of workers employed at an enterprise for underground mining of chrome ores. The content of chromium in the air of the working area and the blood of workers was assessed, a number of biochemical parameters were investigated by unified biochemical methods (IgE specific to chromium, ALAT, γ-HT, creatinine, β2-microglobulin in blood serum, β2-microglobulin in urine, calculation of the glomerular filtration rate) and protein fractions in blood serum using electrophoresis of proteins in agarose gel, modeling of cause-and-effect relationships was carried out. The workers of the mine mining of chromium ores showed a significant increase in the level of chromium in the blood up to 1.3 times, an increase in the level of IgE specific to chromium up to 1.6 times, the activity of ALAT and γ-HT in the blood serum up to 1.3 times, the level of β2-microglobulins in blood serum and urine up to 1.6 times, serum creatinine level, decrease in glomerular filtration rate, increase in serum β-globulin and γ-globulin level relative to similar indicators among employees of the enterprise employed outside the influence of a chemical factor. The constant presence of chromium compounds in the air of the working area leads to an increased concentration of chromium in the blood of workers. An increase in the activity of ALAT and γ-HT in the blood serum, the level of β2-microglobulins in the blood serum and urine, the level of creatinine and IgE specific to chromium in the blood serum, and a decrease in the glomerular filtration rate were found. Changes in protein fractions in blood serum (increase in the level of β-globulins and γ-globulins) were revealed in workers at the mine mining of chromium ores. Ethics. When conducting the study, the authors were guided by the ethical principles of medical research with human participation as a subject, set out in the Declaration of Helsinki by the World Medical Association of the last revision and received informed voluntary consent from each employee to participate in the survey.

Impact of biological clogging and pretreatments on the operation of soil aquifer treatments for wastewater reclamation

Globally, sustainable water management is required to minimize water security, and soil aquifer treatments (SATs) are widely applied in wastewater reclamation. Clogging problems limit the sustainable operation of SATs (i.e., the decrease of infiltration rate), and Physical clogging has been widely studied. However, the effect of biological clogging on the operation of SATs is still unclear. Thus, this study focuses on the effects of biological clogging in an SAT system and demonstrates that the clogging process in an SAT column. In this study, the infiltration rate in the A2O ​+ ​NaN3 water column decreased slightly, to 6–7 ​cm/h with an average rate of 0.01 ​cm/h per month after 240 ​d, compared with an average rate of 0.3 ​cm/h per month in the columns fed by filtered A2O water. The fastest reduction in infiltration rate, caused by biological clogging, occurred in the first 60 ​d and corresponded to the highest reduction in hydraulic conductivity of 0–2.5 ​cm layer. For alleviating clogging, this study illustrated that removing suspended solids from A2O water by filtration helped reduce approximately 25% of polysaccharides and heterotrophic bacteria. In comparison, pre-ozonation of A2O water helped to reduce approximately 70% of the biomass in the surface layer of the A2O ​+ ​O3 column. Thus, ozonation of wastewater effluent helps control biological clogging in SAT.

Ранняя диагностика хронической болезни почек у детей: проблемы и решения

The urgency of the problem of searching for sensitive and specific biomarkers of nephron damage in various pathological conditions is due to the increasing prevalence of chronic kidney disease in children. Currently, chronic kidney disease is determined by a decrease in the glomerular filtration rate, however, this indicator is quite variable, and its fluctuations depend on many factors, such as age, features of the disease, nutrition, and physical activity. The article presents an overview of research on the problem of early diagnosis of chronic kidney disease in children. The advantages and disadvantages of early biomarkers of kidney damage are described, which include NGAL, KIM-1, VEGF, TIMP-1, Type IV collagen, serum creatinine, cystatin C. The conducted studies demonstrate the high diagnostic value of cystatin C in the initial stages of chronic kidney disease.

Application Of Murottal Therapy Of The Qur'an Surah Ar-Rahman As A Nursing Intervention In Tn.A With Decreasing Heart Output

Chronic kidney failure is a condition in which the kidneys experience a decrease in the glomerular filtration rate (GFR) which causes the kidneys to be unable to filter metabolic wastes to be removed and cause these metabolic wastes to accumulate in the body. The main trigger factor for kidney disease and kidney failure is an increase in blood pressure or vice versa when kidney function is impaired/kidney failure, blood pressure can also increase. Murottal Al-Qur'an Surah Ar-Rahman therapy is one of the interventions that can be done to reduce high blood pressure. Murottal Al-Qur'an therapy in this paper was carried out 3 times for 3 visits to post hemodialysis clients with a time of 10 minutes per session on clients with chronic kidney failure. The purpose of this paper is the application of the Surah Ar-Rahman Murottal Al-Qur'an Therapy intervention aimed at clients with nursing diagnoses of decreased cardiac output. Where the condition of the client before the nursing intervention experienced dizziness and headaches marked by an increase in blood pressure after hemodialysis, namely blood pressure: 191/83 mmHg, then after the intervention of Murottal Al-Qur'an Surah Ar-Rahman Therapy there was a decrease in blood pressure marked by the condition the client becomes relaxed and calm without any complaints with a final blood pressure measurement of 130/80 mmHg. So it can be concluded that murottal Al-Qur'an Surah Ar-Rahman therapy can reduce the increase in blood pressure in patients with chronic kidney failure post hemodialysis.

Leptin and adiponectin in patients with chronic kidney disease and secondary hyperparathyroidism

Background. The results of studies evaluating the levels of adiponectin, leptin and their ratios in chronic kidney disease (CKD) are conflicting. It is assumed that hyperleptinemia and changes in adiponectin clearance are consequences of a decrease in the glomerular filtration rate, they exacerbate renal impairment and may affect the prognosis of survival due to cardiovascular events. It is known that secondary hyperaparathyroidism is the most frequent complication of CKD, which not only affects calcium-phosphorus metabolism and bone tissue, but also contributes to the development of pathological processes involving other hormonal and metabolic markers. Of greatest interest is the assessment of adipocytokine levels in the development of secondary hyperparathyroidism against the background of CKD as an independent factor of increasing cardiovascular risks. The purpose of the study was to assess adipocytokine levels (adiponectin, leptin) and their ratios in patients with different stages of chronic kidney disease and their relationship with manifestations of secondary hyperparathyroidism. Materials and methods. This cross-sectional study enrolled 160 people with CKD and 40 healthy individuals as a comparison group. Results. Leptin level reduction and an increase in the proportion of patients with hypoleptinemia with a decrease in the glomerular filtration rate were found, which may be an important factor determining nutritional status. Correlations were revealed between leptin level, body mass index (ρ = 0.411) and patients’ age (ρ = 0.189), as well as between leptin/adiponectin and adiponectin/leptin ratios (ρ = 0.395 and ρ = –0.395) and body mass index in patients with CKD persisting in subgroups by stage of renal failure. A relationship was found with sex for leptin and a decrease in its levels below normal values in both men and women. Conclusions. The proportion of patients with hyperadiponectinemia was significantly higher among those with end-stage CKD compared to patients with stages 1–2. There was no statistically significant relationship between adipocytokine and parathyroid hormone levels and the presence of secondary hyperparathyroidism in patients examined.