Amount Of Salt Research Articles

Direct Synthesis of Mixed-Metal Paddle-Wheel Metal-Organic Frameworks with Controlled Metal Ratios under Ambient Conditions.

Currently, synthesizing mixed-metal metal-organic frameworks (MM-MOFs) in a single step remains a challenge due to the varying reactivities of different metal cations. This often results in the formation of mixtures of monometallic MOFs or MM-MOFs with nonstoichiometric metal ratios. A promising approach to overcoming this issue is the controlled precursor method, which uses prebuilt polynuclear complexes with structures similar to the secondary building units (SBUs) of the desired MOFs. In this study, we report that metal acetates can serve as natural prebuilt SBUs, enabling the controlled synthesis of MBDs ([M2(BDC)2DABCO]n, M = metal, BDC = 1,4-benzenedicarboxylic acid, DABCO = 1,4-diazabicyclo[2,2,2]octane) under ambient conditions. By exploiting the fact that metal acetates readily form soluble paddle-wheel dimers similar to the SBUs of MBDs, we achieve the direct synthesis of mixed-metal MBDs at room temperature. The metal ratios (Zn, Co, and Ni) in the resulting MBDs are controllable, and the production yields exceed 90%. The use of metal acetates facilitates the fast and uniform nucleation of MBDs, regardless of the metal cations involved. This similarity in nucleation rates leads to the formation of bimetallic and trimetallic MBDs with predefined metal ratios and homogeneous metal distribution while maintaining the quality of the MOFs. Importantly, this strategy offers an efficient pathway for synthesizing mixed metal MBDs using stoichiometric amounts of metal salts without toxic additives, high energy consumption, and complex synthesis steps.

Why river islands are formed after every big city

The perennial rivers have high and wide catchment areas that supply water continuously to the rivers. So, all through the year, they get water for their activities. Large cities emerge around such rivers and congregate as huge urban clusters like Delhi, Varanasi, and Patna. It was quite interesting to note that in all the big rivers like the Ganges, after crossing all big cities are invariably present, big river islands. The perceived cause of this is the heavy deposits by the people, or the slowing down of the river as it flattens up. The cause of the river islands is only partly the dirt thrown into the river by the people but largely because of the soap detergents and acids that produce large amounts of salts leading to precipitate and coagulation through a process called Cataphoresis of the colloidal impurities while crossing the cities. Since the river is slender in the cities due to concertized/solid embankment the flow is fairly fast. So, the whole material is pushed beyond the precincts of the cities. But as the river meanders beyond the city's ambit it spreads wider and slows down. So it gives enough opportunity to the colloids to settle down over some time the same enlarges to form River Island.

Effect of Na versus Ca Sulfate Salts on the Hydration of Calcium Sulfoaluminate Clinker.

This paper examined how the amount (5% or 20%) and type (CaSO4 or Na2SO4) of sulphate salt affect the hydration of calcium sulphoaluminate clinker (KCSA). The mechanical behavior of the pastes was determined at 1, 3, 28, and 90 days, the heat flow and total heat were measured with isothermal conduction calorimetry, and the reaction products were characterized using X-ray diffraction (XRD), differential thermal analysis/thermogravimetry (DTA/TG) and scanning electron microscopy (SEM). The results obtained indicated that both the amount of sulphate salt (5% or 20%) and its type (CaSO4 or Na2SO4) affect the hydration kinetics, type of reaction products formed, and development of mechanical strength. The incorporation of CaSO4 has a positive effect on the development of the mechanical strength of KCSA. However, Na2SO4 can also produce adverse side effects at older ages. The presence of Na2SO4 increases pH values, which partly destabilizes the ettringite formed, thereby favoring carbonation and thenardite precipitation, which can cause the specimens to crack and break.

ELECTROPERSULFATE TREATMENT OF OIL PRODUCTION WASTE

A study on the possibility of implementing electropersulfate treatment of waste from the oil industry has been conducted. The dynamics of the volt-ampere characteristics during the transmission of electric current through the soil containing reservoir water and oil, with the introduction of persulfate salt, has been studied.The experiment made it possible to give a preliminary assessment of the possibility of using electropersulfate cleaning. The fairly high rate of electrophysical and electrochemical processes is associated, among other things, with the ability of potassium persulfate to actively oxidize components in the treated environment. The presence of formation water in the soil, which increases the humidity and the amount of salts dissociated into ions, and accordingly increases the conductivity of the soil, can accelerate the process. In addition, the use of iron electrodes promotes the activation of potassium persulfate, as does an increase in soil temperature during electrical treatment. In general, the presented experience allowed us to conclude that soil purification by electrical cleaning using potassium persulfate is suitable. At the same time, an important task for future research is to determine the optimal parameters of the minimum reasonable (in terms of time, amount of charge passed through the medium, dose of introduced persulfate) treatment using electroactivated persulfate salts.

Deep eutectic solvent-based ferrofluid for vortex-assisted liquid-liquid microextraction of nonsteroidal anti-inflammatory drugs from environmental waters

A novel ferrofluid of Fe3O4 nanoparticles and a deep eutectic solvent (DES) composed of menthol and pentanoic acid was introduced as a green microextraction medium. The ferrofluid was successfully used as an extractant for vortex-assisted liquid-liquid microextraction (VALLME) of nonsteroidal anti-inflammatory drugs (NSAIDs) in environmental waters prior to their determination by HPLC-DAD. Once the ferrofluid was dispersed in the sample by vortex agitation, phase separation could be easily achieved by placing a neodymium magnet next to the tube, which eliminated the centrifugation step and simplified the operational procedure. As a result, the sample pretreatment took only ≈2 min. The experimental parameters, including pH, nanoparticle amount, ferrofluid volume, vortex time, salt amount, and disruptive solvent type and its volume, were optimized stepwise. The method showed linear behavior for all NSAIDs from 5 to 100 μg/L, with limit of detection values and enrichment factors in the ranges of 1.68–2.05 μg/L and 38.9–50.6, respectively. Intra- and Inter-day accuracies obtained from the analysis of spiked river, lake, and tap water samples at low and high-quality control levels (20 and 80 μg/L) ranged from 90.3% to 108.0%, with relative standard deviations less than <12.3%. The results of this study demonstrate that the use of DES-based ferrofluid in VALLME can be considered a simple, environmentally friendly, and reliable alternative for the determination of NSAIDs in environmental waters.

Heterogeneous electron transfer of ferrocene in acetonitrile-LiTFSI highly concentrated electrolyte

Highly concentrated electrolytes (HCE) are mixtures of equivalent or near-equivalent amounts of salt and solvent displaying a liquid phase at room temperature. HCE have intensively studied for application in energy storage devices with a particular focus on batteries since the demonstration of the lack of reactivity of lithium metal in an acetonitrile HCE. The lack of "free" solvent molecules in HCE is responsible for their stability. This feature also suggests that heterogeneous electron transfer (ET) in HCE could be different from conventional electrolytes because of the importance of solvent reorganization during ET. Thus, we investigated the heterogeneous electron transfer of the ferrocenium/ferrocene (Fc+/Fc) redox couple as a function of concentration of the salt Li bis(trifluoromethanesulfonyl)imide in acetonitrile, a model system for HCE. We show that while the diffusivity of Fc (Shoup-Szabo) follows the trend with viscosity (η) expected from the Stokes-Einstein relation over the entire concentration range, the ET rate constant (k0) variation with η on the other hand diverges from ideality. Using Raman spectroscopy in the solution and on the surface (EC-SERS), we show that the most likely cause for the difference in ET rate constant between dilute and highly concentrated electrolytes involves a strong coordination of the ferrocenium with the complexes found in HCE. This new knowledge highlights the importance of increasing fundamental research on the topic of electrochemistry in HCE.

Ultra-processing markers are more prevalent in plant-based meat products as compared to their meat-based counterparts in a German food market analysis.

To compare ultra-processing markers and nutrient composition in plant-based meat products (PBMP) with equivalent meat-based products (MBP). A total of 282 PBMP and 149 MBP within 18 product categories were assessed. Based on the NOVA classification, 33 ultra-processing markers were identified and six ultra-processing bullet categories were defined, that is flavour, flavour enhancer, sweetener, colour, other cosmetic additives and non-culinary ingredients. The ingredient lists were analysed concerning these ultra-processing markers and ultra-processing bullet categories, as well as nutrient composition, for all PBMP and MBP. Differences between PBMP and MBP were assessed using chi-square and Mann-Whitney U tests, respectively. Cross-sectional analysis. 282 PBMP and 149 MBP. The percentage of ultra-processed food (UPF) items was significantly higher in PBMP (88 %) as compared to MBP (52 %) (P < 0·0001). The proportion of UPF items was numerically higher in 15 out of 18 product categories with differences in six categories reaching statistical significance (P < 0·05). Flavour, flavour enhancer, colour, other cosmetic additives and non-culinary ingredients were significantly more prevalent in PBMP as compared to MBP (P < 0·0001). Concerning nutrient composition, median energy, total fat, saturated fat and protein content were significantly lower, whereas the amounts of carbohydrate, sugar, fibre and salt were significantly higher in PBMP (P < 0·05). Ultra-processing markers are significantly more prevalent in PBMP as compared to MBP. Since UPF intake has been convincingly linked to metabolic and CVD, substituting MBP with PBMP might have negative net health effects.

Biochar from brown algae: Production, activation, and characterisation

Biochar has shown promise in combining water treatment and soil enhancement with long term carbon sequestration. Biochar performance depends on the feedstock and the pyrolysis process conditions. In this study, we conducted biochar production, activation, and characterisation from the brown algae Laminaria digitata, Saccharina latissima, Saccorhiza polyschides, Himanthalia elongata, and pelagic sargassum for several potential applications. Our results showed that these seaweeds, as harvested and without washing, contained significant amount of salt that needs to be removed to improve biochar quality for application in water treatment. However, presence of salts may confer advantages in certain catalytic processes. X-ray computed micro-tomography analysis shows the formation of porosity as a result of pyrolysis and biochar activation. Chemical activation successfully improved the biochar quality, in particular the available surface area for water and soil remediation. These results pave the way to extend applications of brown algae derived activated biochars.

Improving the technology for the production of raw dried beef products

The relevance of this work lies in the need to reduce the negative impact on human health of sodium nitrite (food additive E250), which is added to meat products, in particular to raw dried sausages, in order to accelerate their maturation and give them the shades familiar to consumers. The aim of the work is to improve the technology for the production of raw dried beef products based on the use of modern biotechnological approaches, sea salt and the natural colouring agent betanin, and beetroot juice as a substitute for sodium nitrite. This goal was achieved through the implementation of a mixed salting method, whereby the surface of the meat semi-product was rubbed with a reduced amount of salt, including 0.0005 kilograms of sodium nitrite per kilogram of meat weight, compared to standard technology, and the rest of the salting mixture, which contained 0.0045 sodium nitrite, was injected deep into the semi-product as an aqueous solution. The source of nitrite was beetroot juice rich in nitrate ion, 0.03 dm3 of which contained 0.0052 kilograms of sodium nitrate, sufficient to synthesize 0.0045 kilograms of nitrite ion per kilogram of meat raw material. The chosen salting method reduced the amount of sodium nitrite from 0.015 to 0.005 kilograms per kilogram of meat product compared to the classical method, and the addition of beetroot juice made it possible to give the product a uniform colour throughout. Contamination of the product with dangerous microflora was prevented by adding a preparation containing bacteria of the Pediococcus acidilactici and Staphylococcus carnosus strains to the syringe solution. A positive effect of Pediococcus acidilactici was found, which was achieved by accelerating the pH of the meat mass to 5.0÷5.5, which stopped the growth of most dangerous microorganisms, including Shigella spp., Salmonella spp., Clostridium difficile and Escherichia coli. The product was protected from the development of Listeria monocytogenes bacteria by bacteria of the Staphylococcus carnosus strain. The proposed technology can be used in the food industry in the manufacture of raw meat products, which will significantly reduce the negative impact of sodium nitrite on human health

MATHEMATICAL ANALYSIS OF THE SORPTION PROCESS OF MINE WATER PURIFICATION

Contaminated mine water with a large amount of salts makes underground and surface water sources unsuitable for household and drinking needs. Already in 2016, there was a shortage of drinking water in the Rostov region. Water from surface sources does not meet the hygienic requirements for chemical parameters in 36.1% of the samples taken. Water from underground sources in terms of color, turbidity, total hardness, dry residue, content of iron ions, manganese, hydrogen sulfide, nitrates, ammonia, chlorides, sulfates, magnesium, sodium did not meet the required standards in 72.2% of cases. Due to the need for huge expenses for the purification of highly mineralized waters and the poor development of cheap technologies for the neutralization of large volumes, attempts to purify discharged or flowing mine waters to a safe level turn out to be practically fruitless. In this article, studies were carried out to reduce the concentration of dissolved ions of heavy metals (iron, manganese, copper and zinc) in mine wastewater by sorption in a static mode (charring) using rice husk biochar with electromagnetic treatment. The authors proposed a method for pre-treatment of the sorbent from rice husk biochar in an electromagnetic field at a process activation unit. The results of laboratory tests confirmed the high efficiency of the sorbent for the removal of heavy metal ions from mine waters. On the basis of the results obtained, optimization of the sorption purification of mine waters in the mode of carbonization was carried out using the method of mathematical planning of the experiment (full factorial experiment FFE 2k). The factors most influencing the efficiency of mine wastewater treatment from iron and zinc ions have been identified. With a probability of 0.95, the proposed models are adequate, and they can be used to describe the sorption process when using the studied sorbent to remove heavy metal ions (iron, zinc, etc.), while the optimal concentration of the sorbent from rice husks is within 0.5 mg/l. With an increase and decrease in the concentration of the sorbent above the optimal values, the efficiency of sorption decreases, and this affects the iron to a greater extent. In general, the obtained sorbent has a chemical composition similar to that of activated carbon (the most widely used sorbent for water purification), but at the same time it is a cheap production waste, which confirms its efficiency, both technological and economic, when used to purify natural and waste water. With the introduction of the proposed treatment scheme for mine water treatment facilities, it is expected that the concentrations of dissolved heavy metal ions, in particular, iron, zinc, manganese, will decrease to the concentration of the discharge into the reservoir.

Green preparation of high entropy ceramics (Y0.2Sm0.2Eu0.2Er0.2Yb0.2)2SiO5 with low thermal conductivity by molten salt synthesis

High entropy rare earth silicate ceramics have been widely studied as potential material for environmental barrier coatings (EBCs). At present, the synthesis method of high entropy rare earth silicate ceramics is generally solid state reaction method, which has some problems such as high energy consumption, low efficiency and low purity of synthesized products. In order to solve these problems, high entropy (Y0.2Sm0.2Eu0.2Er0.2Yb0.2)2SiO5 was prepared by molten salt synthesis (MSS). By adjusting the reaction temperature and the amount of molten salt, it was found that the pure high entropy (Y0.2Sm0.2Eu0.2Er0.2Yb0.2)2SiO5 ceramic powders could be synthesized at 1400 °C when Na2SO4 and K2SO4 are selected as molten salts(Na+:K+ = 1:1), and the mass ratio of molten salt to reactant is 1: 1. The molten salt synthesis significantly reduced the reaction temperature and accelerated the reaction rate. The prepared high entropy (Y0.2Sm0.2Eu0.2Er0.2Yb0.2)2SiO5 has a monoclinic X2-type Re2SiO5 structure and a low thermal conductivity of 0.96 ± 0.03 W m-1 K-1 due to the high entropy effect. This can be explained by the existence of high concentration oxygen vacancies and the highly disordered arrangement of multicomponent cations in a unique high entropy configuration. This material also shows good infrared reflectance, which makes (Y0.2Sm0.2Eu0.2Er0.2Yb0.2)2SiO5 a potential environmental barrier coating material.

Adaptive laboratory evolution of Rhodococcus rhodochrous DSM6263 for chlorophenol degradation under hypersaline condition

BackgroundNormally, a salt amount greater than 3.5% (w/v) is defined as hypersaline. Large amounts of hypersaline wastewater containing organic pollutants need to be treated before it can be discharged into the environment. The most critical aspect of the biological treatment of saline wastewater is the inhibitory/toxic effect exerted on bacterial metabolism by high salt concentrations. Although efforts have been dedicated to improving the performance through the use of salt-tolerant or halophilic bacteria, the diversities of the strains and the range of substrate spectrum remain limited, especially in chlorophenol wastewater treatment.ResultsIn this study, a salt-tolerant chlorophenol-degrading strain was generated from Rhodococcus rhodochrous DSM6263, an original aniline degrader, by adaptive laboratory evolution. The evolved strain R. rhodochrous CP-8 could tolerant 8% NaCl with 4-chlorophenol degradation capacity. The synonymous mutation in phosphodiesterase of strain CP-8 may retard the hydrolysis of cyclic adenosine monophosphate (cAMP), which is a key factor reported in the osmoregulation. The experimentally verified up-regulation of intracellular cAMP level in the evolved strain CP-8 contributes to the improvement of growth phenotype under high osmotic condition. Additionally, a point mutant of the catechol 1,2-dioxygenase, CatAN211S, was revealed to show the 1.9-fold increment on activity, which the mechanism was well explained by molecular docking analysis.ConclusionsThis study developed one chlorophenol-degrading strain with extraordinary capacity of salt tolerance, which showed great application potential in hypersaline chlorophenol wastewater treatment. The synonymous mutation in phosphodiesterase resulted in the change of intracellular cAMP concentration and then increase the osmotic tolerance in the evolved strain. The catechol 1,2-dioxygenase mutant with improved activity also facilitated chlorophenol removal since it is the key enzyme in the degradation pathway.

Clean Energy Transition through the Sustainable Exploration and Use of Lithium in Oman: Potential and Challenges

This study is probably the first of its kind to explore the potential and challenges of developing a clean energy transition through sustainable exploration and the use of lithium in Oman’s mining industry. This study explains how growing energy and environmental concerns significantly intensify interest in electric vehicles and hybrid electric vehicles, consequently increasing the demand for lithium exploration and production. Whereas Umm as Samim and Mahout are usually identified as major resources for a potential lithium commodity, this study uses statistical data from Oman’s National Center of Statistics and Information (NCSI) to determine the quantity and value of salt, lithium production, and sales to assess their commercial viability. The findings reveal that Oman has huge potential for lithium exploitation and production, considering the enormous quantities of spodumene and seawater salt with high-grade lithium available, developing efficient regulations and rules to protect investors’ rights, and reducing the environmental risks associated with the production and recycling of lithium-ion batteries. The realization of this potential cannot be attained until serious challenges in the country’s regulations, environmental hazards, and investment strategy are overcome. This study concludes by offering some practical and policy implications.

An investigation into synthesis and characterization of Ag-nanoparticles using green chemistry, and their antibacterial properties

The quest for new nano-systems is ongoing to provide tailored nanoparticle systems for commercial purposes. The ability to manage their size and morphology leads to an advantage over other characteristics, therefore, a stable generation system is considered critical for their applications. We employed rose plant leaves extract to generate Ag-NPs via silver nitrate (AgNO3) as a basic ingredient in this study. The procedure was executed for multiple concentrations of the plant extract, as well as varying amounts of salt, and for different time periods. All of the different steps resulted in the development of Ag-NPs. The emergence of an absorption peak at 425 nm in UV-Vis spectroscopic spectra, and the presence of spherical particles visualized through SEM provided evidence of the creation of small-sized Ag-NPs. Finally, using the spread plate method, the antibacterial activity of Ag-NPs was investigated, and it was discovered that Ag-NPs exhibit high antibacterial activity against the four bacterial strains.

Design of spherical agglomeration via salt-induced liquid–liquid phase separation

In this study, a novel strategy for spherical agglomeration via salt-induced liquid–liquid phase separation (SI–SA) was developed. SI–SA technology achieves phase separation in the miscible binary anti-solvent crystallization system by adding certain amounts of salts, avoiding the use of toxic bridging liquids. Water–organic solvent–salt systems that induced phase separation were selected using phase separation experiments. The wetting performance of the organic solvent was estimated by droplet experiments, and organic solvents with stronger wettability for crystals than water would be selected for further verification. Spherical agglomeration experiments were designed based on the ternary phase diagrams of these selected systems. Water–organic solvent–salt systems of benzoic acid were selected, starting with six organic solvents and four salts. A total number of 16 water–organic solvents–salt systems were effectively predicted using the SI–SA strategy. The in-situ process analysis tool indicated that the formation of spherical particles of benzoic acid underwent a process of crystallization, phase separation, wetting, two-step agglomeration, and consolidation. The stirring rate and mass ratio of salt to final crystals were found to be important for controlling the morphology and particle size of the spherical crystals. The spherical particles of aspirin and salicylic acid were successfully predicted in different systems via SI–SA technology, demonstrating the universality and potential usage of SI–SA technology in industry.

Study on thermal behavior of hazardous substances in the process of preparing corundum from black aluminum dross

The black aluminum dross (BAD) from aluminum recycling industry is considered to be a hazardous material due to containing a large amount of AlN and fluoride salt. The potential environmental problems caused by BAD restrict the sustainable development of the aluminum recycling industry. A calcining-leaching process for preparing α-Al2O3 by using BAD is proposed in this paper. The transformation mechanism of toxic substances is discussed in detail based on the analysis of TG-DTG-DSC&MS. The results show that the reaction between AlN and O2 occurs in the range of 500–1000 °C. Most of the gaseous products are N2, and there is also a small amount of NO. The average conversion rate is 0.087 mg/min. The average volatilization rate of chloride salt in BAD under Ar atmosphere is 0.065 mg/min, and the average volatilization rate under Ar + O2 atmosphere is 0.089 mg/min, which is slightly higher than that of pure Ar atmosphere. The BAD processed by calcination-leaching process contain more than 95 % corundum and magnesia-aluminum spinel, which can be used as high-quality raw materials for the preparation of refractory materials.

Salt Intake Estimation from Urine Samples in South Asian Population: Scoping Review.

The World Health Organization recommended reducing one's salt intake below 5 g/day to prevent disability and death from cardiovascular and other chronic diseases. This review aimed to identify salt estimation at the population level in South Asian countries, namely Afghanistan, Bangladesh, Bhutan, India, Nepal, Pakistan, and Sri Lanka. We searched electronic databases and government websites for the literature and reports published between January 2011 and October 2021 and also consulted key informants for unpublished reports. We included studies that assessed salt intake from urinary sodium excretion, either spot urine or a 24 h urine sample, on a minimum of 100 samples in South Asian countries. We included 12 studies meeting the criteria after screening 2043 studies, out of which five followed nationally representative methods. This review revealed that salt intake in South Asian countries ranges from 6.7-13.3 g/day. The reported lowest level of salt intake was in Bangladesh and India, and the highest one was in Nepal. The estimated salt intake reported in the nationally representative studies were ranging from 8 g/day (in India) to 12.1 g/day (in Afghanistan). Salt consumption in men (8.9-12.5 g/day) was reported higher than in women (7.1-12.5 g/day). Despite the global target of population salt intake reduction, people in South Asian countries consume a much higher amount of salt than the WHO-recommended level.

Insight into the reaction characteristics of H2-reduction decomposition of gypsum: Experimental and isothermal kinetic analysis

In addition to its primary component, calcium sulfate, industrial by-product gypsum also contains trace amounts of heavy metals and soluble salts. When accumulated or landfilled over an extended period, this can lead to soil and groundwater pollution. Utilizing the H2 reduction decomposition of industrial by-product gypsum not only addresses the challenge of managing this waste but also offers a low CO2 emission method for producing quicklime. This study investigates the influence of reaction temperature, H2 concentration, and the PCO2/PH2 partial pressure ratio on the reductive decomposition of CaSO4 through experimental analysis. Subsequently, it delves into the kinetic characteristics of CaO production from the reductive decomposition of CaSO4 by H2, employing isothermal kinetic approaches. Finally, the feasibility of employing industrial by-product gypsum reduction and decomposition technology for quicklime preparation is explored. The results reveal that CaSO4 can be entirely decomposed into CaO when the temperature exceeds 1000 °C, H2 concentration is ≥ 2%, and the PCO2/PH2 ≥ 8. The interaction of CaS with CaSO4 is identified as the primary secondary reaction within the intermediate product CaS. When CaSO4 is decomposed in an atmosphere comprising 2% H2, 20% CO2, and N2, the apparent activation energies for the reaction, as determined by both the model-free and model-fitting methods, are 41.56 kJ/mol and 49.34 kJ/mol, respectively, with a modified reaction order of n = 1.748 and a modified model function of G(α) = [−ln (1-α)]0.572. Furthermore, the overall reaction rate is governed by the nucleation and growth rates of CaO. Lastly, the product quicklime obtained from the reductive decomposition of desulfurization gypsum and phosphogypsum using H2 contains over 90% CaO, complete absence of CaS, and conforms to the first-grade construction quicklime standards.

Irrigation Water – Quality Issues, Limits, and Way Forward

Depending on how groundwater has been collected and used, the severity of the rainfall, and the following aquifer recharge, the quality of irrigation fluids differs between regions, nations, and even towns. In hot, arid regions with limited rainfall, the salinity of groundwater used for agriculture rises, limiting the variety of crops that may be produced. Therefore, determining the quality of the irrigation water is essential. How well water works for irrigation relies on how much and what kinds of soluble salts are present in the solution. In regard to the four fundamental standards of water salinity (electrical conductivity), sodium risk (sodium adsorption ratio-SAR), residual sodium carbonates (RSC), and ion toxicity, the amount and make-up of soluble salts in a solution are reviewed. We talk about the risks associated with boron and chlorides. For convenience, several plant species' boron tolerance levels are given. The updated water quality diagram created by the US Salinity Laboratory Staff in 1954 is the most significant section of this review. The salinity of most irrigation fluids is more than 2250 S cm-1, which is not represented in this picture. The water classification diagram was expanded to include salinities up to 30,000 S cm-1 in order to handle EC values larger than 2250 S cm-1. The categories for salinity and sodicity presented here can be used to select and manage crops in an educated manner. Methods for controlling water sodicity with gypsum and lowering water salinity by combining different waters are described with examples.

Treatment of Produced Water Using Microalgae

Produced water is one of the key attractions in the oil fields, where formation water rises to the surface along with the crude oil and is then separated to prevent many problems that may arise during transportation. Nevertheless, the created water is occasionally injected into a man-made lake inside the fields. The sands, creatures, vegetation, and formation water are all contaminated by the lake's water. Because produced water contains minerals and inorganic salts, effective treatment of this water is crucial. This study was conducted to examine how treating produced water with organic elements like freshwater algae affected the amount of salts in the formation water. Two types of freshwater algae namely: Oedogonium algae , Zygnema algae, were used.&#x0D; Electrical Conductivity (E.C), pH, total dissolved solids (TDS), and salinity were measured before and after the treatment at different times intervals ( on day one, the fourth day, and the seventh day). The results showed that Oedogonium algae have positive effects on the first day, whereas TDS decreased from 5364 mg/l to 1381 mg/l, pH changed from 7.13 to 8.7, E.C decreased from 10.95 ms/cm to 2.818 ms/cm, and salinity decreased from 6.2 ppt to 1.6 ppt. The treated produced water was used for irrigation of plants and as a drinking water for animals without any detrimental effects.