Treatment Station Research Articles

Analysis of Water Dynamics at the Effluent Treatment Station of Cooperoque: Evaluation of Precipitation, Evaporation, and Infiltration of Effluent from a Milk Refrigeration Station

Purpose: The study aims to analyze water dynamics at the Cooperoque Effluent Treatment Station, focusing on the interactions between precipitation, evaporation, and effluent infiltration to enhance water resource management. Theoretical reference: The research references various studies and methodologies related to the quantification of evaporation from lakes and reservoirs, particularly in semi-arid regions, utilizing the Jensen-Haise Method for evaporation estimation. The research aligns with previous studies, such as Mallmann (2014), on water infiltration in soil management, emphasizing the importance of understanding water dynamics for sustainable resource management. Method: The study employs the Jensen-Haise Method to calculate evaporation rates, covering the period from January 2023 to October 2024. It examines the effects of precipitation, evaporation, and effluent infiltration on tank levels. Results and conclusion: The results reveal that tank levels are influenced by precipitation, evaporation, and effluent infiltration, with more significant declines during dry months and smaller reductions during periods of high precipitation. Evaporation rates, calculated using the Jensen-Haise Method, are higher in warmer months, contributing to lower tank levels, while these rates decrease in colder months. A notable anomaly occurred in May 2024 when effluent infiltration exceeded the volume of generated effluents and rainfall due to the activation of an irrigation system. Key findings indicate that lake levels drop more during dry months, with a significant negative water balance observed in May 2024 due to excessive infiltration during heavy rainfall. The study concludes that adaptive water management strategies are necessary to address climatic variations and improve the efficiency of the effluent treatment system. Implications of research: The research provides valuable insights for developing adaptive water management strategies to address climatic variations and improve the efficiency of effluent treatment systems. Continuous monitoring is emphasized as crucial for sustainable water resource management. Originality/value: The study highlights the complex interactions between precipitation, evaporation, and effluent dynamics, offering a foundation for improved water management practices and contributing to the preservation of regional water resources. The study contributes to the understanding of water dynamics at effluent treatment stations, offering practical insights for managing water resources effectively. It highlights the importance of adaptive strategies and continuous monitoring to maintain pond levels and optimize the treatment process.

Variability of drinking water for pigs and poutry the southern region of Brazil over a twelve – month period

The increase in global food demand has led to intensified production of pigs and poultry. In this context, water quality on farms needs to be monitored to ensure maximum production and animal welfare. This study aimed to evaluate the quality and variability of drinking water for animals over twelve months in properties in the Southern Region of Brazil. Physical, chemical, microbiological parameters, and the average rainfall index of nine water sources were observed. Variations in pH were noted among the evaluated water sources, as well as within the same source over monthly collections. A relationship between average rainfall and elevated iron levels was also demonstrated. Nitrate and nitrite levels exceeded Brazilian legislation at certain sampling points, posing risks to human and animal health. In 67.59% of samplings, total coliforms were present, and 59.26% showed the presence of Escherichia coli. The study highlighted the variability of water sources in the Southern Region of Brazil, reflecting the need for constant monitoring and treatment measures, such as water treatment stations, chlorination systems, and acidification in rural properties.

ROOT ANALYSIS OF LOSS STRUCTURAL INTEGRITY FOR OIL COOLING RADIATORS IN COMPRESSOR STATIONS PUMPING ASSOCIATED PETROLEUM GAS CONTAINING WET H2S

One of the main problems in the associated petroleum gas treatment is its further beneficial usage. Gases of the end stages of separation require special technical solutions when involving them in the production process due to low pressure. At the same time, gases of the first stages of separation by 70–90 % of the total amount are mainly used in gas processing plants. Gas of the end stages of separation contains components C3+ and higher from 400 to 2000 g/m3 and is a valuable petrochemical raw material. To transporting gas of the end stages of separation, compression is necessary to achieve sufficient pressure. When compressing gases of the end stages of separation, a significant amount of unstable condensate containing hydrocarbons C4–C12 and water is released. In addition, the end-stage gas is saturated with sulfur compounds (H2S and R-SH), which evaporate intensively from the crude oil after its heating from the end-stage separators of oil treatment. The equipment of compressor stations for gas treatment and transportation, as a rule, does not have protection against internal corrosion. Recently, failures of cooling system radiators, pipes of air gas cooling devices made of non-ferrous metal alloys have been recorded. Radiator failures are associated with the loss of their structural integrity. Oil stains without visible flows, cracks or pits appear on the outer surface of the radiator cooling channels, while in the channels of copper alloy channels radiators, clogging of individual channels is often observed over a short period of operation of the compressor station. Understanding the causes of leaks in liquid cooling radiators as part of compressor stations for pumping associated petroleum gas of the end stages of separation is an important aspect for ensuring reliable operation of process equipment and preventing possible emergency situations. The article reflects the results of studies aimed at identifying the causes of radiators structural integrity loss of oil cooling systems in the composition of block compressor stations for compression of associated petroleum gas containing hydrogen sulfide and moisture. Solutions and recommendation to minimize the risks of equipment failures of for compression stations are made.

Mathematical Models for Removal of Pharmaceutical Pollutants in Rehabilitated Treatment Plants

This paper aims to investigate appropriate mathematical models devoted to the optimization of some cleaning processes related to pharmaceutical contaminant removal. In our recent works, we found the rehabilitation of the existing cleaning plants as a viable solution for the removal of this type of micropollutants from waters by introducing efficient techniques such as adsorption on granulated active carbon filters and micro-, nano-, or ultrafiltration. To have these processes under better control and to assure the transfer from small- to large-scale treatment stations, specific mathematical models are necessary. Starting from Navier–Stokes equations and imposing proper boundary conditions, some mathematical physics problems are obtained for which adequate solving methods via variational methods and surjectivity results are proposed. The importance of these solution characterizations consists in their continuation in adequate numerical methods and the possibility to visualize the result by using a CFD program.

Hydrothermal carbonization of primary sewage sludge in a prototype reactor: Sensitivity analysis of key parameters for hydrochar and liquid phase upscaling and reuse

Hydrothermal carbonization (HTC) of untreated sewage sludge with high water content was evaluated as an alternative to usual wastewater treatment. This bold approach allowed bioproducts useful as biofuel and nutrient sources to be obtained directly from raw sludge. HTC experiments were performed in a scalable arrangement (technology readiness level >4) composed of a 10-liter high-pressure reactor. The influence of the experimental conditions, including temperature (180-220°C), reaction time (60-120min), and pH (6.5-12.0), was evaluated on nutrients and heavy metal distribution through the liquid phase by a 23 central composite design with a triple central point. The bioproducts were characterized by a set of six analytical techniques, and the results were refined by statistical procedures (Principal Component Analysis and Response Surface Methodology). pH is a variable that impacts bioproducts’ characteristics, making it a guiding factor for application. Basic pH promotes transfer of components from solid to liquid phase, while natural pH favors the heating value of hydrochars. Liquid phase is a carbon- and nitrogen-rich source that can be useful for plant nutrition, mainly due to the increase of ammonia nitrogen from 20.6 to 51.7wt.% under pH 6.5, and an expressive decrease of chemical oxygen demand from 32 to 6-16 mgO2L-1. The hydrochar can be considered a renewable solid fuel, reaching up to 12.43 MJ kg-1 under pH 6.5; the basic pH favored an increase in the O/C ratio and lower HHV values. HTC of primary sewage sludge can replace steps of a conventional treatment station and promotes treated wastewater reuse.

Evaluation of the Efficiency of Hospital Wastewater Treatment Systems and Stations in the Atlantic and Littoral Departments of Benin

Evaluation of the Efficiency of Hospital Wastewater Treatment Systems and Stations in the Atlantic and Littoral Departments of Benin

Pilot Study on the Possibility of Improving Water Treatment Sludge Management in Almaty

This article presents the results of a pilot study on the treatment of sludge from a water treatment plant in the city of Almaty, Republic of Kazakhstan, to ensure further disposal. The main objective of the study was to compare the efficiency of sludge drying by natural and artificial methods. The qualitative characteristics of the leachate from the dewatering unit, the chemical composition of the dried sludge and the granulometric analysis of the dried sludge were also studied. The greatest reduction in moisture content was recorded for drying in natural conditions (2.1%), but this process required the longest drying time. The leachate obtained from sludge dewatering was characterized by significant contamination (e.g., turbidity—55.65 on average, color—67.7, total Fe—5.15 mg/L, total N—79.6 mg/L, COD—311 mg/L, BOD—336.15 mg/L), which indicates the need for its pretreatment before further management in the technological system of the treatment station. The content of chemical substances contained in the dry residue of the sludge was also determined, of which aluminum was 0.94–13.8 mg/kg, silicon was 50.24–146.3 mg/kg, potassium was 1.72–5.51. mg/kg, calcium was 71.8–79.1 mg/kg, iron was 2.0–7.54 mg/kg and nickel was 0.9–4.4 mg/kg. A particle size analysis of the dried sludge showed that the majority fractions were fine and very fine sand, with a total of 20.2%, and silt and clay, with a total of 78.3%. Such properties justify the rationality of considering the reuse of dried sludge as a raw material for making, for example, construction materials or soil remediation material.

Preparation of a Map of Potential Areas For the Installation of a Sewage Treatment Plant in the Porto Murtinho/MS Region

Objective: The main objective is to prepare a thematic map to identify potential areas for the installation of a Sewage Treatment Station (ETE). Theoretical Framework: This study addresses the importance of selecting locations for the installation of ETEs, which prioritize environmental and social aspects, in which geotechnologies are presented as valuable tools for efficient and integrated analysis. Method: The methodology of this research was based on the acquisition and processing of geospatial and environmental data, complemented by the generation of thematic maps such as watercourses, areas subject to flooding, roads, land use and occupation, slope, soils and distances from the urban perimeter. Data integration through map algebra was performed in the QGIS software, in addition, WRPLOT View was used for the directional analysis of the winds in Porto Murtinho/MS. Results and Discussion: The results of this study indicate that the areas with the greatest potential for installation are mostly located within 1 (one) kilometer of the urban perimeter security strip. The analysis of the prevailing winds revealed that they form a corridor in the north/south direction, suggesting that the regions east of the city are more suitable for the implementation of the treatment system. Research Implications: The multifaceted approach, considering environmental and operational factors, makes it possible to identify suitable areas for ETEs. Originality/Value: This study was developed, highlighting that limiting factors are essential in identifying areas unsuitable for installing the structure, while non-limiting maps are essential for classifying the installation potential.

Design and Analysis of Small Fallen Leaf Collection, Crushing, and Recycling Vehicle

Leaf recycling, a crucial component of urban environmental protection, aims to systematically collect and reuse fallen leaves on streets. At present, fallen leaves are usually cleaned manually by sanitation workers, and environmental protection departments then use special cars to transport fallen leaves to treatment stations for incineration. This not only requires a significant amount of labor and material resources but also causes air pollution and wastes fallen leaves. In this study, a collecting, crushing, and recycling vehicle was designed to solve this problem. The proposed device significantly improves the efficiency of collecting fallen leaves and facilitates their secondary utilization. The design process is described in detail, including the working design of the entire device, static analysis, and transmission system design. The entire vehicle model was 3D printed to verify that the initial design concept satisfies the assembly and production requirements of the device.

ALUM SLUDGE AS A POTENTIAL ADSORBENT FOR REMOVING CD(II) AND NI(II) IONS FROM AQUEOUS SOLUTIONS – EQUILIBRIUM STUDIES

The present research evaluates the possibility of using alum sludge from water treatment stations(WTS) as an effective adsorbent for Ni(II) and Cd(II). The physicochemical properties weredetermined of four alum sludge, from WTS Czaniec (AS-C), WTS Kozłowa Góra (AS-K), WTSMaczki (AS-M), and WTS Będzin (AS-B). The adsorption of ions was investigated by batchexperiments at room temperature, a wide range of initial concentrations (1-1000 mg/L), and anadsorbent dose of 10 g/L. The experimental data were analysed by Freundlich, Langmuir andDubinin-Radushkevich isotherms, using linear and nonlinear regression analysis. All alum sludgeused in the study was found to have better binding capacities for Ni(II) ions than for Cd(II) ions.At the maximum initial concentration Ni(II) ions were bound in the following order: AS-K =>AS-B => AS-M => AS-C, while Cd(II) ions were bound in the following order: AS-B => AS-M=> AS-K => AS-C. The results indicated that the adsorption mechanism primarily involves ionexchange and also electrostatic interactions. It can be concluded that alum sludge is a promisingadsorption material for the removal of metal ions from aqueous solutions.

Investigation of the chemical and microbial quality of water supplied by treatment stations in Kerman city, Iran

ABSTRACT This study aimed to investigate the quality of water supplied in Kerman city, southeast Iran. Total hardness, nitrite, nitrate, total dissolved solids, electrical conductivity, total coliforms, fecal coliforms, and elements were measured in samples from five stations in four seasons in 2022. The concentration levels of (mg/L) As (0.42 ± 1.83), Cd (0.004 ± 0.01), Cu (2.51 ± 3.38), Ni (1.33 ± 0.86), and Pb (1.50 ± 2.11) were more than the standard. Total coliforms in samples (5.30 ± 7.87) were more than the national standard (0/100 mL) with a significant mean difference in seasons (p-value = 0.04). Fecal coliforms were detected in samples collected in autumn (2.00 ± 0.00/100 mL). The findings showed that water treatment in stations could not remove the toxic heavy metals of As, Pb, and Cd. But the microbial pollution was detected in some samples. Therefore, the use of these waters is generally not recommended. Further studies and comparisons with water quality in the distribution system can provide more useful results.

Treatment of Oily Effluents Using a Bacterial Cellulose Membrane as the Filter Bed

One of the main challenges in the treatment of industrial wastewater is the removal of oil-in-water emulsions, which are stable and therefore difficult to treat. Bacterial cellulose (BC) has structural characteristics that make it an ideal filtration membrane. Several research projects are underway to develop new materials, both biotechnological and traditional, for use in filter beds. The study examined the potential of a BC membrane filtration system for treating oily industrial wastewaters, an underexplored biomaterial in wastewater treatment. The results demonstrated that BC is highly effective at removing oily contaminants (~99%), reducing the colour and particulate matter of wastewater, as well as eliminating nearly the entire microbiological load (~99%). SEM, MEV, FTIR, XRD, and TGA confirmed the presence of oil in the interior of the membrane after filtration, characteristic peaks of its chemical composition, and a 40% reduction in crystallinity. TGA revealed an increase from three (pre-filtration) to five (post-filtration) stages of thermal degradation, indicating the retention of the contaminant in the BC. The mechanical tests demonstrated that the membrane has a tensile strength of 72.13 ± 8.22 MPa and tolerated elongation of up to 21.11 ± 4.81% prior to tearing. The BC membrane also exhibited excellent flexibility, as it could be folded >100 times at the same point without exhibiting signs of tearing. The BC surpasses traditional methods, such as activated charcoal and effluent treatment stations, in the removal of emulsified oils. The findings demonstrate that BC is promising for the treatment of industrial wastewaters, which is a field that requires continual technological innovations to mitigate the environmental impacts of the oil industry.

Toxic potential evaluation of liquid effluents discharged into nature by the university hospital centers (UHC) and mixed wastewater treatment station (WWTS) at Ouagadougou-Burkina Faso.

In Burkina Faso, several investigations have raised suspicions that hospital liquid effluents are the source of contaminants in porbeagle-culture products and surface water in urban and peri-urban areas. This study aimed to evaluate the hygienic quality of hospital liquid effluents discharged into nature by the UHC Bogodogo (UHC-BOG), Yalgado Ouédraogo (UHC-YO), and the WWTS of Kossodo (WWTS-KOS). Thus, 15 samples of liquid effluents (five per site) discharged into nature were collected. Within the physicochemical parameters, the pH, chemical oxygen demand (COD), biochemical oxygen demand (BOD5), suspended solids (TSS), conductivity, copper, iron, hafnium, silver, mercury, lead, and cadmium of these samples were determined using standard methods. The mean values of pH were 8.84 ± 0.42,8.06 ± 0.54, and 8.55 ± 0.53 for WWTS-KOS, UHC-BOG, and UHC-YO, respectively. Conductivity values were 1956.80 ± 81.30, 812.80 ± 45.22, and 956.00 ± 39.96 µS/cm, respectively. TSS were 338.20 ± 38.80, 45.00 ± 5.79, and 187.80 ± 27.58mg/L, respectively. COD were 274.80 ± 20.46, 35.00 ± 5.52, and 139.80 ± 25.53mg/L, respectively. BOD5 were 186.40 ± 68.68, 26.20 ± 4.82, and 81.80 ± 15.63mg/L, respectively. Mercury values were 1.93 ± 0.38, 4.04 ± 0.38, and 14.37 ± 1.65µg/L, respectively. Lead values were 434.70 ± 202.42, 310.50 ± 4.09, and 367.43 ± 94.01µg/L, respectively. Cadmium values were 79.59 ± 19.48, 109.94 ± 8.43, and 80.26 ± 7.85µg/L, respectively. Copper values were 27.66 ± 3.33, 30.84 ± 1.65, and 28.32 ± 2.36mg/L, respectively. Iron was detected only on the STEP-KOS with an average of 71.01 ± 37.83mg/L. Hafnium values were 50.27 ± 4.49 and 51.58 ± 4.61mg/L for WWTS-KOS and UHC-BOG, respectively. Silver values were 34.26 ± 3.06 for WWTS-KOS. On the three sites, the differences found were significant (p < 0.05). Liquid hospital effluents from Ouagadougou discharged into nature on the whole do not compile with the Burkinabè normative values for the discharge of wastewater into the environment.

Effect of Central Dialysis Fluid Delivery System (CDDS) using high flux dialyzer versus Regular Water Treatment Stations on Endotoxemia and Inflammatory Markers among Prevalent Patients on Regular Hemodialysis

Abstract Background and Objectives Translocated endotoxins derived either from intestinal bacteria or backfiltration, have a wide range of adverse effects on patients. Most end stage renal disease (ESRD) patients have systemic inflammation which increases the risk of morbidity and mortality. The central dialysis fluid delivery system (CDDS) has been used exclusively in Japan since 1960s, and now is being used in Ain Shams University. Our aim of the study is to evaluate the effect of (CDDS) versus single patient dialysis fluid delivery system (SPDDS) on endotoxemia and inflammatory markers among prevalent patients on regular hemodialysis (HD). Methods Eighty Patients were randomly selected from HD units, then divided into two groups, (group I) doing HD using CDDS water purification system at El Demerdash Hospital, (group II) using regular water purification system at Ain Shams University Specialized Hospital. Pre- dialysis and post-dialysis serum samples were obtained to measure endotoxin levels of both groups, as well as postdialysis serum samples were obtained to measure interleukin 6 (IL6) level and highly sensitive Creactive protein (Hs CRP). Results Circulating endotoxemia was most notable in group II, The mean predialysis endotoxin level in group I was 0.07 ± 0.05 Eu/mL, while in group II was 0.20 ± 0.07 Eu/mL and mean of post-dialysis endotoxin level in group I was 0.04 ± 0.02 Eu/mL, while in group II was 0.15 ± 0.03 Eu/mL. IL6 as well as Hs CRP levels were higher in group II in comparison to group I. Conclusion Our data showed significant reduction in circulating endotoxins in CDDS group.

Evaluation of the Drinking Water Quality Index in Dibis District – Kirkuk

In this study, a weighted mathematical model was utilized to evaluate the water quality of the filtration station in the Al-Dibs district. The assessment was conducted at five different sites from October 2023 to April 2024. Various characteristics of the water samples were measured, encompassing physical properties like turbidity, total suspended solids, total dissolved solids, and electrical conductivity. Additionally, chemical properties such as pH, total alkalinity, total hardness, calcium hardness, magnesium hardness, chloride, total nitrogen, and available phosphorus were analyzed. Bacterial properties, including total bacterial count, coliform bacteria, and fecal bacteria, were also assessed. The study monitored various sites along the Lower Zab River, including the raw water collection point, water pumping area, Oil Quarter, Diyarbakır Quarter, and Kolan Quarter. Results revealed unsatisfactory water quality at the raw water collection point, while excellent quality was observed at the other sites (2, 3, 4, 5). The water quality index rankings were as follows: 18.10, 17.61, 47.96, 30.40.These findings suggest that the water treatment station effectively produces water suitable for daily sanitary purposes.

Ultrasonic control of aquatic macrophytes in reservoirs: An integrated review

The excessive proliferation of cyanobacteria and aquatic macrophytes in water reservoirs has been a concern for governments, energy companies managing hydroelectric and thermal power plants, and local populations. These aquatic organisms, when overabundant, negatively impact the management of water for public supply and energy generation, obstructing intake systems and damaging water treatment stations. Ultrasound emerges as a potential technique for controlling these organisms. The aim of this study was to perform an integrative review by selecting articles published between 2020 and 2024, focusing on the efficacy and ecological implications of ultrasonic control on these aquatic populations. The methodology involved searching scientific databases, selecting 14 articles out of a total of 42, based on their relevance to the theme of ultrasonic control and its practical applicability. The results indicate that ultrasonic frequencies of 20 kHz collapsed gas vacuoles in these aquatic organisms within 40 seconds of exposure, demonstrating the potential application of this technique in controlling these organisms, although it is necessary to adjust the intensity according to the specific environmental conditions of the reservoir and the biology of the target organisms. However, exposure to ultrasound can release toxins, affect non-target organisms, and alter the aquatic community structure, resulting in negative impacts such as hypoxia and fish death. It highlights the need to adopt an adaptive model to adjust ultrasound parameters and integrate them with other management practices. The study emphasizes the importance of conducting laboratory-scale tests and continuous monitoring to optimize efficacy and minimize environmental risks. Future development of more efficient and less invasive ultrasonic transducers is also recommended, as well as interdisciplinary collaboration to promote more sustainable reservoir management.

Evaluation of Lead Ion in the Wastewater of the Lifting and Treatment Stations Using ICP-MS and CPE Methods

To pre-concentrate trace amounts of lead before determining it by UV-vis spectrophotometer, a new method for micelle-mediated phase separation has been created. The process depends on the extraction of lead from iodine media using Triton X-114 in the cloud point extraction method without the need for any chelating agents, where the optimal conditions for the method were achieved, which temperature 50 °C, pH 4, and 30 mmol L−1 concentration of KI, 0.3 mL of 2% (v/v) Triton X-114, and time of 10 min in the water bath. Linearity was followed between 1 and 16 µg/mL of lead concentration. The method's lead detection limit is 0.1 µg/mL and %RSD 3.633. Additionally, the interference impact of certain cations was evaluated. The proposed technique was successfully applied to determine the lead ion in the wastewater in ten different stations in the center and district of Al-Hur in Karbala City. The lead ion of the wastewater of the stations under study was also determined directly using inductively coupled plasma-mass spectrometry (ICP-MS) technology comparing its results with the new method and performing the statistical analysis of both methods. The p-value was less than 0.05, showing significant differences between both methods.

COMPARATIVE STUDY OF TWO DYNAMIC DECANTERS USED AT THE PASPANGA WATER TREATMENT PLANT IN BURKINA FASO: CASE OF ACCELATOR AND PULSATOR

Water is a basic resource for humans because their survival and some of their activities depend on it. There are several types of water depending on their sources including groundwater and surface water. In its natural state, most water needs to be treated before consumption. The National Water and Sanitation Office (ONEA) is one of the structures responsible at the national level for the purification of this water. The Paspanga water treatment station is an ONEA structure which exploits the water from the Loumbila and Ouaga 3 dams. This raw water follows an entire treatment process which involves the use of hydraulic structures such as decanters before being drinkable. The analysis of turbidity was carried out by nephelometry, pH and conductivity by electrochemistry, and organic matter by titrimetry. The results obtained made it possible to compare the accelator and pulsator decanters. For the same raw water we observed a drop in turbidity ranging from 58 to 83% for the accelator and from 51 to 75% for the pulsator. For a minimum average pH of the raw water of 6.76, the decanted water of the accelator has a minimum average pH of 6.49 and that of the pulsator of 6.46. For the same raw water we observed a drop in organic matter ranging from 22 to 52% for the accelator and from 16 to 41% for the pulsator. From all these results, it appears that the accelator is more efficient than the pulsator.

Effect of central dialysis fluid delivery system using high flux dialyzer versus regular water treatment stations on endotoxemia and inflammatory markers among prevalent patients on regular hemodialysis

Effect of central dialysis fluid delivery system using high flux dialyzer versus regular water treatment stations on endotoxemia and inflammatory markers among prevalent patients on regular hemodialysis

Physicochemical characterization of wastewater from the Niamey National Hospital (NNH) (Niger) and assessment of its impact on the environment

The Niamey National Hospital (NNH) is among the reference hospital in the Niamey region (Niger) to after the quality of care it offers to the population. However, these activities have a negative impact on the quality of the water of the river constituting one of the main sources of water supply for the population of Niamey and gardening activities. This study aims to determine the physicochemical quality of wastewater from the NNH activated sludge treatment plant and its impact on the environment. To carry out this study, twenty (20) wastewater samples were taken at the outlet of the NNH treatment station. The sampling lasted five (5) weeks to take into count fluctuations. The results obtained indicate that the average values of physicochemical parameters such as: the pH (6,91), temperature (27.825°C), conductivity (574.80 µS/cm) and certain heavy metals of this hospital are compliance with national and international standards for wastewater discharge. However, it was noted that the average values ​​obtained at the HNN for copper (1.982 mg/L); zinc (1.077 mg/L); in phosphorus (18.065 mg/L); DCO (808 mgO2/L) and DBO5 (442.5 mgO2/L) do not comply with national and international wastewater discharge standards. These abnormal levels must be treated before being released into the river.