Optimum Coagulant Dose Research Articles

The influence of environmental factor on the coagulation enhanced ultrafiltration of algae-laden water: Role of two anionic surfactants to the separation performance

With the acceleration of urbanization and the improvement of people's living standards, more chemicals that humans rely on are entering the city and surrounding water bodies. Anionic surfactants are one of the essential products for human beings. It is also one of the inducements that cause the eutrophication. The algae-laden water caused by eutrophication is a headache in the traditional water treatment process. To solve the problem, ultrafitration combined process was widely investigated to treat the algae-laden water. The presence of stimuli, low concentration anionic surfactant, probably interfere the performance of ultrafiltration process during algae-laden water treatment. In this study, the influence of two typical anionic surfactants, sodium dodecyl sulfate (SDS) and sodium dodecyl benzene sulfonate (LAS), on the performance of coagulation-enhanced ultrafiltration was investigated. The aluminum sulfate hydrate and iron sulfate hydrate were respectively employed as coagulant. Based on the residual turbidity and zeta potential, 4 mg/L Al and 8 mg/L Fe were determined as the optimal coagulant dosage. The floc morphology confirmed that Al-algae flocs with lower fractal dimension (Df) were looser and more porous compared to Fe-algae flocs. More coagulant was depleted by LAS due to the better hydrophobicity of LAS. During the filtration process, LAS caused a larger flux reduction compared with SDS regardless of the coagulant that was used. More organic compounds penetrate into membrane pores and block the pores with the presence of LAS since algal cell aggregation was weakened. Finally, the rejection of organic compounds by the coagulation-enhanced ultrafiltration process was studied, and the co-existing surfactants can cause effluent deterioration. Therefore, the presence of surfactants has a negative effect to the ultrafiltration treatment of algae-laden water.

Prediction of the optimal dosage of coagulants in water treatment plants through developing models based on artificial neural network fuzzy inference system (ANFIS).

Coagulation and flocculation are the prominent processes and unit-operations in water treatment plants. One of the most challenging operations in water treatment process is determining of the coagulant dose. The Jar-test method is usually used to determine the coagulant dose. Considering that this traditional method is time consuming, associated with human error and highly affected by raw water quality fluctuations. In this study, artificial fuzzy neural network (ANFIS) according to subtractive clustering (SUB) method was applied in order to determine the optimal dose of coagulant in the water treatment plants. Adopting SUB method tend to moderate the number of rules and the interconnections besides enhancing the model responsibility and smart model recognition. The amount of pH, turbidity of raw water influent, alkalinity, temperature, and electrical conductivity were collected as input data. The results of modeling by ANFIS with correlation coefficients of 0.85 and 0.84 and RMSE 1.32 and 1.83, respectively, for alum and polyaluminum chloride (PAC) coagulant dose, indicated that ANFIS is an effective method for determination of the optimal coagulation dose in the water treatment plant.

Treat-ability of Manihot esculenta Peel Extract as Coagulant Aid for Stabilised Leachate

Agro-waste can be commercialised into another useful product such as natural coagulant for wastewater treatment. The purpose of this study was to quantify the ability of agro-waste (Manihot esculenta peel extract (MEP)) as an aid alongside the utilisation of chemical coagulant (polyaluminium chloride (PAC)) based on the removal percentages of selected parameters at the optimum coagulant dosage and pH of stabilised leachate. Series of jar tests were used to compare the leachate treatments using single and the dual coagulant of PAC and MEP with respective standard methods to analyse the removal parameters, i.e., Colorimetric (APHA Method:5220 C, HACH Method:8000) for chemical oxygen demand (COD), Conductimetric (APHA Method: 4500-N, HACH Method: 8038) for ammonia nitrogen (AN), Nephelometric (APHA Method:2130) for turbidity, Spectrophotometric (APHA Method: 2120 B, HACH Method: 8025) for colour, and Gravimetric (APHA Method:2540 D, HACH Method:630) for suspended solids (SS). Leachate treatment using the application of single PAC coagulant at the optimum conditions of 3,750 mg/L dosage and pH 6.0 of leachate managed to remove about 54.1%, 28%, 91.1%, 98%, and 98% for COD, AN, turbidity, colour, and SS, respectively. Meanwhile, by using dual coagulant at the optimum dosages of 3,500 mg/L (PAC) and 250 mg/L (MEP), and pH 7.0 of leachate, the treatment achieved higher removal except for the colour parameter. The final removal outcomes of this study were 58.3% of COD, 34% of AN, 96.9% of turbidity, 92.1% of colour, and 99% of SS. The application of MEP as coagulant aid also managed to reduce the aluminium (Al) content in PAC dosage from 577.5 mg/L to 539.0 mg/L without affecting much of its efficiency.

Wastewater treatment from potato processing industry using Moringa Oleifera-based coagulant

Potato is the third most important food crop on the planet. The potato processing industry produces a variety of food products and has high effluent generation with high organic load and solids content. These must be treated before being disposed of in water bodies. One of the options for treatment of industrial effluents widely studied in the literature is the use of natural coagulants. In this context, this work aims to evaluate the efficiency of effluent treatment of a potato processing industry in Brazil through the use of coagulants based on Moringa Oleifera. Five flocculation essays (Jar Essay) were performed, evaluating the use of Moringa Oleifera both in direct use (flour crushed) and in saline solution, for different coagulant mass and volume values. Turbidity removal rates close to 93% were obtained when using Moringa Oleifera in saline as a coagulant, which is the most efficient use of Moringa seeds compared to their direct use. BOD (Biochemical Oxygen Demand) removal was also high, with values around 90%. The Moringa planting area required for effluent treatment of the studied industry is 1.14 ha. The obtained results allowed the identification of the optimal coagulant dosages to be used and demonstrate the feasibility of using Moringa Oleifera to treat potato processing effluent.

Polyaluminium chloride dosing effects on coagulation performance: case study, Barekese, Ghana

Abstract Alum, the predominant coagulant in conventional drinking water treatment schemes, has various disadvantages including the production of large volumes of sludge, lowering water pH (requiring pH adjustment using lime), limited coagulation pH range of 6.5 to 8.0, etc. At the Barekese Water Treatment Plant in Ghana, an alternative, the polyelectrolyte – polyaluminium chloride (PAC) is also used in coagulation but limited information is available on the operating conditions required to achieve better performance than alum-based coagulation. The aim of this study was to determine the optimal coagulant dose, mixing speed and operating pH for enhanced performance in water treatment. The effects on the treatment process of three different sets of mixing speed pairs – 180/40, 180/25 and 150/25 revolutions per minute (fast/slow) – in a pH range of 6.5 to 8.0 were investigated. The mixing speed and PAC dose yielding the best coagulation were 150/25 rpm and 15 mg/L respectively. The optimal pH range for PAC coagulation performance was 7.5 to 8.0.

Influence of the powdered moringa oleifera seed extract on the characteristics of greywater

Introduction: Moringa oleifera, commonly known as the drumstick tree, is a fast-growing tree native to the tropic and subtopic regions, especially the Himalayas. Moringa oleifera has been used for generations to treat and prevent diseases including diabetes and heart diseases. The issue of greywater recycling and reuse raise attention in past decades, and it is performing a rapid growth on the global level today (1). For the treatment of greywater, there are many remedial techniques available, but coagulation is considered the best option because of its effective cost, simplicity in design, and ease of operation. Sometimes it seems to be very expensive technology due to the causer of the cost of commercial coagulant used (2). Attempts have been made to use treated water for non-potable use such as gardening, irrigation, toilet flushing, concrete production. Reusing wastewater by natural materials is an effective method for sustaining the use of water as other purposes. Methods: In this study, the greywater has been treated using Moringa oleifera seed extract among all other natural materials. The objective of this research is to evaluate the efficiency of Moringa oleifera to treatment greywater by varying the mixing time, pH, coagulant dose, and mixing speed. The Moringa oleifera seed powdered were collected, dried, ground to the coarse powdered, and extract has been prepared. The treated samples were analyzed for Chemical Oxygen Demand (COD), Biological Oxygen Demand (BOD), Turbidity, Total suspended solids (TSS). Results & Discussions: The treatment shows an efficient reduction of performance parameters such as COD (71.2%), BOD (85.3%), Turbidity (98.8%), and TSS (89%). The optimum pH found for this both coagulants to studied wastewater is in the range of 6-8. The optimum dose found to be almost the same for the filtration and without filtration coagulant used for the wastewater. While in the case of filtrate extract, a lower dose of coagulant was required. The optimum dose of coagulant was observed as 400 mg/L and 500 g/L for filtration and without filtration extract, respectively. The COD analysis of treated samples at optimized operational parameters revealed a bit decreasing trend of COD. However, a sign of bit increased levels of COD is also observed in some of the samples using Moringa oleifera as a coagulant. Conclusions: The concentration of examined parameters in the study were reported to be decreased when treated with moringa oleifera. The application of the obtained treated wastewater for the gardening purposes is recommended. Keywords: Moringa oleifera, Greywater, Natural materials, Coagulant

Development of model in removal of phosphorus using natural coagulants

ABSTRACT In this paper, an endeavour is made to study the feasibility of natural coagulants like Cicer arietinum, Dolichos lablab, Maize seeds, Moringa oleifera seeds, Okra seeds, Orange peel, Peanut seeds, Roselle seeds, Sapodilla seeds and Strychonos potatorum seeds on the reduction of phosphorous content from Industrial wastewater. The batch coagulation test was done to identify the optimum coagulant dosage, pH level at which the removal efficiency is high, mixing time and floc settling time required for the removal of phosphorous in the wastewater. A chart was plotted between the removal efficiency of all the chosen coagulants corresponding to the dosage, pH, mixing time and settling time. The removal percentage of phosphorous is more for Moringa oleifera seeds with 93%, followed by Strychonos potatorum seeds with 89% and Sapodilla seeds with 83% demonstrates the minimum phosphorous removal from the wastewater as 37%. Moringa oleifera seeds can be utilised as an effective coagulant for the removal of phosphorous from the wastewater. The maximum percentage removal efficiency of phosphorous was achieved by Moringa oleifera seeds for the coagulant dosage 5.8 mL, pH of 7, mixing time of 30 minutes, settling time of 30 minute and the final phosphorus concentration of 306.1 mg/L was achieved. Also, the corresponding values of pH, optimum coagulant dosage, mixing time and settling time for the phosphorus removal vary according to each chosen coagulants. Based on this study, a model was developed in accordance with the coagulation dosage and concentration of phosphorus. The overall regression accuracy of the Langmuir hypothesis model was identified as r 2 = 0.94.

Potential of Strychnos Potatorum and Eirchorrnia Crassipes in Treating Dyeing Industry Waste

The research aim is to the treatment of industrial dyeing waste water for the analysis of improved water treatment using natural coagulants. For waste water treatment, natural coagulants such as Strychnos potatorum (nirmali seeds) and Eirchorrnia crassipes (water hyacinth) are used. We have test the various properties of dyeing waste water before and after treatment like pH, sulphates, chlorides, total solids, total suspended solids (TSS), total dissolved solids (TDS), acidity, alkalinity, optimum coagulant dosage (jar apparatus), biological oxygen demand (BOD) and chemical oxygen demand (COD) .The test results showed that natural coagulants produce better results when used alone or in conjunction with the chemical coagulant alum. Since the natural coagulant generates less floc, the cost of sludge treatment is reduced. Water hyacinth outperforms nirmali seed in terms of natural coagulants. Natural coagulants may be used to manage and treat the dyeing waste water, anywhere there is an abundance of it.

The Effectiveness of Moringa oleifera L. Seeds as A Biocoagulant in Reducing Liquid Waste of The Soft Drink Industry

The liquid waste of the soft drink industry usually uses as raw materials in the form of sugar as a flavoring with glucose as the main raw material. Thus, it is not surprising that this waste contains a lot of organic materials. Companies generally use an aerobic system to control contamination that may occur due to the high organic content contained in waste. The purpose of this study was to provide another alternative in controlling liquid industrial waste pollution by using natural coagulants in terms of reducing COD, TSS, turbidity, and pH with various doses of moringa seed coagulants. This research was conducted by finding the optimum dose of coagulant in reducing COD, TSS, turbidity and pH values. Based on the research results, the optimum dose obtained was 1.5 grams of moringa seed coagulant which can reduce TSS by 89%, turbidity 65% and COD by 88%. From these results it can be concluded that using the moringa seed coagulant can improve the quality of liquid waste in the soft drink industry. Keywords: moringa seed s, bio coagulant , liquid waste industry, COD, TSS

Development of Natural Coagulant for Turbidity Removal Created from Marine Product Solid Waste

The presence of scallop shells, one of the marine products, increases the problem of solid waste disposal. This material is disposed to landfill without proper use, making it necessary to develop natural coagulant made from scallop shells. This research aimed to investigate the ability of scallop shells as a natural coagulant to remove turbidity. The scallop shell was used to produce chitosan, then adopted as a natural coagulant compared to a commercial product. Water turbidity, river water, and batik wastewater were examined using different coagulant doses, solution pH, and turbidity concentration. Based on data from this study, scallop shell-based chitosan has a high ability to reduce turbidity concentration in water. To remove artificial turbidity in water (14 NTU), the optimum coagulant dose was 150 mg/L and solution pH was 6. The ability of natural coagulants to remove river water turbidity (81 NTU) and batik was 72% and 87% respectively. The performance of commercial coagulant to remove artificial turbidity, river water, and batik wastewater was similar to the natural coagulant, making this novel natural coagulant a promising coagulant for water and wastewater treatment in the near future. Furthermore, massive production of natural coagulant can also solve the problem of scallop shell solid waste generation.

Pilot-scale field study for vanadium removal from mining-influenced waters using an iron-based sorbent

This study investigated the removal of vanadium from mining waters at a closed mine site (Mustavaara, Finland) using granular ferric oxyhydroxide (CFH-12) on pilot scale. Two filter systems, pilot A and pilot B, were placed in different streams, where the influent in pilot A contained a higher and very variable vanadium concentration (6.46–99.1 mg/L), while the pilot B treated influent had lower vanadium concentrations (0.443–2.33 mg/L). The operation periods were 51 days for pilot A and 127 days for pilot B. Water quality analyses revealed that vanadium was efficiently captured in the filter system in both pilots. X-ray fluorescence analysis revealed that the filter beds were not fully saturated with vanadium. X-ray photoelectron spectroscopy confirmed that oxidised vanadium (5+) existed in the used CFH-12 and the carbon content in the used material had increased due to the adsorbed organic compounds. For comparison, lab-scale coagulation experiments were conducted using ferric sulphate for the influent of pilot A (the sampled batch contained 15.9 mg/L V). The optimum coagulant dosage was 350 mg/L (>93% vanadium removal) at the original pH (7.8–7.9) of the influent, whereas the required coagulant amount decreased when the influent pH was adjusted to 4.6–4.8.

Performance intensification of the coagulation process in drinking water treatment

Surface water pollution has increased, owing to industrial development and population growth. Consequently, it is important to find alternative drinking water treatment strategies, which cater for changes in the quality of raw water. This study compared the efficiency of different coagulants in treating raw water that feeds a drinking water treatment plant (WTP). Using jar testing equipment and a number of physicochemical parameters, an investigation was conducted to establish optimum conditions for aluminium chloride (A), ferric chloride (B), and chitosan (C), and their performance compared with aluminium sulphate (D), which is the coagulant used at the WTP. The turbidity removal efficiencies for the single coagulants were in the order: B (95.7%) > A (94.7%) > C (94.4%), at optimum coagulant doses of 60, 50, and 0.6 mg/L, respectively. The coagulants achieved high removal efficiencies for turbidity, total dissolved solids (TDS), ultraviolet absorbance at 254 nm (UV254) and conductivity under acidic conditions. For dual coagulants, there was a gradual increase in the removal efficiencies of the tested parameters with increasing pH. Combined coagulants were more effective compared to single coagulants, with highest removal efficiencies being exhibited by the A/C combination. Overall, the coagulants proved to be suitable alternatives to D, since they had comparable performances.

The Utilization of Sedimentation Pond Acid Mine Drainage Sludge as Coagulant to Reduce COD and TSS Concentration in Domestic Wastewater

Acid mine drainage (AMD) treatment leaves residue in the form of sludge that contains large amounts of metal, silica, ferric, and alum. This research aims to determine the capabilities that AMD sludge-synthesized coagulant has in reducing COD and TSS concentration in domestic wastewater. The domestic wastewater sample used in this research is an artificial domestic wastewater with a COD concentration of 285 mg/l and a TSS concentration of 245.31 mg/l. After going through Acidification process, AMD sludge coagulant contains Si (43.66%), Fe (30.02%), dan Al (12.35%). A jar test is then performed in order to determine the optimal coagulant dosage. In this process, a coagulant dosage of 40 mg/; 60 mg/l; 80 mg/l; 100 mg/l; 140 mg/l; 180 mg/l; and 200 mg/l was used with 100 mg/l being the optimal coagulant dosage. The AMD sludge containing the optimal coagulant dosage of 100 mg/l is found to be able to reduce COD concentration by 34.74% and TSS concentration by 95.63% from the tested domestic wastewater sample. This research can illustrate the vast potential that the AMD sludge has as a coagulant.

Effect of coagulation pretreatment on the performance of gravity-driven membrane filtration with Yangtze River water

Gravity-driven membrane (GDM) filtration is promising for decentralized drinking water treatments. To improve the permeability and permeate quality of GDM process, three GDM systems (in-line coagulation system, pre-coagulation system, and system without coagulation as control) were operated in parallel at 65 mbar for 63 days to evaluate the effects of coagulation on flux development, permeate quality, composition and structure of the biofouling layer. The optimal dose of coagulant (polyaluminium chloride) was determined as 4 mg/L. The stable flux increased by 140% and 210% in the in-line coagulation and pre-coagulation systems compared to that of the control system, respectively. Dissolved organic compounds were removed by 31.9% and 29.4% in the in-line coagulation and pre-coagulation systems, while the control system showed a poor removal efficiency (5%). The effective removal of organics from raw water by coagulation resulted in less substrates available in the biofouling layers, thus affecting the production of extracellular polymeric substances (EPS) by limiting the biological processes. The EPS content in the biofouling layer of pre-coagulation system was the lowest, consistent with the highest flux. And such nutrient-poor biofouling layers modified the microbial community, changing the dominant bacteria from Firmicutes to Actinobacteria, thereby affecting the flux. Loose and heterogeneous biofouling layers with numerous holes and cracks were observed under coagulation conditions, which was conducive to the passage of water. All systems exhibited excellent ammonia removal efficiency (96%), but coagulation extended the start-up time for nitrification from 3 days to 5 days. Overall, these results demonstrate that coagulation can improve the GDM filtration performance, and the pre-coagulation system is globally optimal.

Multi-Response Optimization of Coagulation and Flocculation of Olive Mill Wastewater: Statistical Approach

Olive oil production is one of the important industrial sectors within the agro-food framework of the Mediterranean region, economically important to the people working in this sector, although there is also a threat to the environment due to residues. The main wastes of the olive oil extraction process are olive mill wastewater (OMW) and olive husks which also require proper treatment before dismissal. In this research work, the main goal is to introduce grey relational analysis, a technique for multi-response optimization, to the coagulation and flocculation process of OMW to select the optimum coagulant dosage. The coagulation and flocculation process was carried out by adding aluminum sulfate (Alum) to the waste stream in different dosages, starting from 100 to 2000 mg/L. In previous research work, optimization of this process on OMW was briefly discussed, but there is no literature available that reports the optimal coagulant dosage verified through the grey relational analysis method; therefore, this method was applied for selecting the best operating conditions for lowering a combination of multi-responses such as chemical oxygen demand (COD), total organic carbon (TOC), total phenols and turbidity. From the analysis, the 600 mg/L coagulant dosage appears to be top ranked, which obtained a higher grey relational grade. The implementation of statistical techniques in OMW treatment can enhance the efficiency of this process, which in turn supports the preparation of waste streams for further purification processes in a sustainable way.

Full-scale trials to achieve low total phosphorus in effluents from sewage treatment works

The tightening of phosphorus (P) standards has forced the UK water industry to identify options to improve P removal in sewage treatment works. This article presents results of 12-month trials testing three technologies at full-scale: a membrane bioreactor (MBR), a continuous backwash up-flow sand filter (CBUSF) and a high-rate compressible media filter (HRCMF). The aim of the trial was to determine the lowest total phosphorus (TP) concentrations that these systems can consistently achieve under stable operating conditions. MBR is a mature technology combining biological treatment with membrane filtration for solids removal. CBUSF uses granular media deep filtration as removal process while HRCMF uses a synthetic fibre compressible media to retain solids and both technologies are typically applied as tertiary treatments in combination with chemical P removal. The lowest TP effluent concentration was recorded for CBUSF (0.22 mg P/L) while the highest TP removal was recorded for MBR (95 ± 3 %). HRCMF delivered the poorest performance (32 ± 26 % TP removal, 1.7 mg P/L average TP effluent), attributed to limited chemical TP binding and solids removal under the conditions tested. Factors affecting P removal performance during the trial were the identification of the optimal coagulant dose to bind soluble P, the formation of solids that can be removed by the separation unit, insufficient reaction time for the coagulation process and the carryover of coagulant into the final effluent. The trials gave valuable insights to address the implementation of new technologies or upgrade existing assets' performance.

Enhanced coagulation coupled with heavy metal capturing for heavy metals removal from coal gasification brine and a novel mathematical model

The wastewater reuse and industrial salt recovery from coal gasification brine (CGB) is the last step for the zero liquid discharge (ZLD) of coal chemical wastewater, and the heavy metals removal is the key limiting factor for the ZLD process. In this research, heavy metals were removed by using the enhanced coagulation coupled with heavy metal capturing technology. Step by step, the optimal type and dosage of chelating agent and flocculant, as well as the optimal coagulant dosage was determined via the single-factor method. Additionally, the impacts of critical water quality parameters (temperature, pH, salinity and organics, etc.) on the removal of heavy metals were also investigated. Finally, the model targeted the removal of total arsenic (As) was constructed by four-factor quadratic regression orthogonal rotation combination design. The initial heavy metal concentration, the amount of heavy metal chelating agents (HMCAs), the amount of flocculant and the amount of coagulant were taken as independent variables, while the total As concentration of effluent was taken as the dependent variable, obtaining the significant regression equation: Y =0.1165 + 0.04187x1-0.01829x3+0.00941x22+0.0116x32-0.00719x2x3 (F2 = 264.22380, p＜0.01). The results demonstrated that appropriate amount of HMCAs and flocculant determined removal efficiency of heavy metals.

Competitiveness in removing copper, zinc and chromium trivalent in plating industrial effluent by using hydroxide precipitation versus sulphide precipitation

Plating industry wastewater is one of the processes that may contain various types of heavy metals. The most common heavy metals that mostly found are copper, nickel, cadmium, chromium, silver, zinc, and lead. In this study, three types of metals which are copper, zinc and chromium trivalent were removed using hydroxide precipitation and sulphide precipitation. Both performances of the method were observed and compared. A jar test was used to determine the optimum pH, coagulant dosage and precipitant dosage. The coagulant and precipitant used in this experiment was ferric chloride (FeCl3), poly aluminium chloride (PAC), sodium hydroxide (hydroxide precipitant) and sodium sulphide (sulphide precipitation) respectively. In order to remove chromium trivalent, sodium metabisulfite was used to reduce chromium hexavalent to chromium trivalent. Based on the result, hydroxide precipitation can remove 86.61% of copper, 99.81% of zinc and 99.99% of chromium trivalent. While, for sulphide precipitation, 93.91% of copper, 99.37% of zinc and 99.99% of chromium trivalent were removed. Therefore, sulphide precipitation can remove better mixed heavy metals, thus it also produces less total suspended solid compared to hydroxide precipitation.

Enhancement of electroflotation using Musa acuminate peel as biocoagulant on the wastewater treatment of chemical laboratory

In this study, the combined biocoagulation electroflotation process using Musa acuminate peel coagulant was evaluated using chemical laboratory wastewater as water sample. The effectiveness of the combined biocoagulation electroflotation process was seen based on the proportion of turbidity removal (%) and the proportion of TDS removal (%). The results showed that the proportion of turbidity reduction in chemical laboratory waste was 98,23% and the proportion of TDS disposal was 28,85% using an optimum coagulant dose of 0,5g/500 mL of chemical laboratory wastewater.

OPTIMIZATION OF THE DRINKING WATER TREATMENT PROCESS OF A SUGAR PLANT STATION IN COTE DIVOIRE

This article presents an optimization of the drinking water treatment process at the SUCRIVOIRE treatment station. The objective is to optimize the coagulation and flocculation process (fundamental process of the treatment of said plant)by determining the optimal dosages of the products injected and then proposes a program for calculating the optimal dose of coagulant in order to automatically determine the optimal dose of the latter according to the raw water quality. This contribution has the advantage of saving the user from any calculations the latter simply enters the characteristics of the raw effluent using the physical interface of the program in order to obtain the optimum corresponding coagulant concentration. For the determination of the optimal coagulant doses, we performed Jar-Test flocculation tests in the laboratory over a period of three months. The results made it possible to set up a polynomial regression model of the optimal dose of alumina sulfate as a function of the raw water parameters. A program for calculating the optimal dose of coagulant was carried out on Visual Basic. The optimal doses of coagulant obtained vary from 25, 35, 40 and 45 mg/l depending on the characteristics of the raw effluent. The model obtained is: . Finally, verification tests were carried out using this model on the process. The results obtained meet the WHO drinkability standards for all parameters for a settling time of two hours.