Mobilité et spéciation du chrome dans un système à phragmites australis de traitement des eaux usées de tanneries

L’objectif de ce travail est l’étude de la répartition, la migration, la spéciation et la biodisponibilité du Cr dans les différents horizons du sol au niveau d’un pilote à Phragmites australis (Cav.) Trin ex Steudel de traitement du rejet du tannage au chrome. Les résultats obtenus sont comparés à ceux d’un pilote non planté. La spéciation chimique du Cr total a été réalisée par cinq extractions séquentielles. L’extraction du chrome biodisponible est effectuée par CaCl2 (0,1 M). Les résultats de la répartition du Cr montrent que l’horizon superficiel renferme des teneurs élevées en Cr 80 % et que cette accumulation est statistiquement différente entre les deux pilotes (p<0,05) : 48 ± 4 g·kg-1 pour le système planté et 39 ± 7 g·kg-1 pour le système non planté. Les résultats de la spéciation chimique totale du Cr indiquent qu’il est très lié à la phase oxydable : 36 ± 10 % pour le système planté (PP) et 54 ± 9 % pour le système non planté (NPP). La teneur en Cr retenue dans la fraction résiduelle présente 26 ± 3 % et 25 ± 2 % respectivement pour le système PP et NPP. La proportion du Cr retenue dans la fraction carbonate est de 19,5 ± 5 % pour le système PP et 10,7 ± 5 % pour le système NPP. La part du Cr associée à la phase réductible présente 18 ± 6 % et 10 ± 4 % respectivement pour le système PP et NPP. Pour les deux pilotes le Cr total est peu échangeable et sa teneur biodisponible est faible. En outre, les résultats montrent que la présence de Phragmites australis a provoqué la libération partielle du Cr de la fraction organique mobile vers les formes carbonate et réductible relativement stables dans le système planté. Les résultats trouvés montrent que Phragmites australis présente une accumulation assez importante en Cr au niveau des racines : 1690 ± 124 mg·kg-1 en matière sèche. Le calcul du bilan global de l’épuration révèle que le Cr est surtout retenu par le sol (94 %) et que 5 % du Cr est prélevé par la plante. Cependant, la présence de Phragmites australis assure une porosité suffisante pour la percolation des eaux en traitement et permet le traitement d’un volume d’eau usée plus grand.The present study illustrates the distribution, mobility, bioavailability and speciation of total chromium (Cr) in the various strata of a constructed reed bed soil in comparison to unplanted soil under arid climate conditions. The operationally determined speciation of Cr was investigated using a five-step sequential extraction method using CaCl2 (0.1 M) to extract bioavailable Cr.The results indicated that there was a significant accumulation of total Cr, reaching 80% in the surface strata for the planted (PP) and unplanted (NPP) systems. Analysis of variance (ANOVA) showed a significant difference (p<0.05) in Cr accumulation in the surface of the soil between the PP system (48 ± 4 g·kg-1) and the NPP system (39 ± 7 g·kg‑1). The partitioning results indicated that the percentage of Cr in the exchangeable phase was very low. The Cr was mainly associated with the oxidizable phase: 36 ± 10% for the PP system and 54 ± 9% for the NPP system. The residual phase contained 26 ± 3%, 25 ± 2% of the Cr for the PP and NPP systems, respectively. The carbonate fraction represented 19.5 ± 5% for PP system and 10.7 ± 5% for NPP system, whereas the reducible fraction represented 18 ± 6% for the PP system and 10 ± 4% for the NPP system. The sequential extraction results showed that Phragmites australis had the ability to partially transfer Cr from the mobile oxidizable fraction to the less mobile reducible and carbonate fractions. Indeed, Cr was relatively unavailable to the plant but the results did show that Phragmites australis accumulated an appreciable amount of Cr in the roots (1690 mg·kg-1 dry matter). Furthermore, after 13 months, the soil had accumulated high amounts of chromium (94%) with only 5% of the Cr accumulated in Phragmites australis. The presence of plants ensures a sufficient porosity for the percolation of water for treatment, which makes it possible to treat a larger volume of wastewater and to reduce the required soil surface area needed for treatment

Élimination des polluants organiques des effluents de l’industrie oléicole par combinaison d’un filtre à sable et un lit planté

L’objectif de la présente étude consiste, d’une part, tester les performances d’un filtre à sable pour diminuer la charge organique des margines diluées à 50 % avec des eaux usées urbaines et, d’autre part, compléter le traitement par l’utilisation d’un mélange de plantes aquatiques composé de Phragmites australis, Typha latifolia et Arundo donax sous un régime d’écoulement vertical.Le pilote expérimental est composé d’un filtre à sable suivi d’un système planté. Le filtre à sable est rempli sur une épaisseur de 50 cm de sable et 10 cm de gravier en haut et en bas du pot. L’alimentation (4 cm•j‑1) se fait en bâchée avec une fréquence régulière de trois fois par semaine. Afin d’améliorer le processus de dégradation dans le filtre à sable, les margines ont été diluées avec des eaux usées urbaines à 50 %. La deuxième étape de traitement se compose d’un bac de capacité (1x1x1 m3) rempli sur une épaisseur de 20 cm de gravier et 60 cm de sol. Le bac est planté d’une combinaison de trois plantes : Phragmites australis, Typha latifolia et Arundo donax avec une densité de huit plants•m‑2 pour chaque plante. L’alimentation du bac se fait par des margines précédemment prétraitées en bâchée de 20 L avec une fréquence régulière de deux fois par semaine.Les résultats ont montré que le filtre à sable assure une neutralisation du pH qui passe de 4,79 à 7,68. L’enrichissement du sable par les micro-organismes permet d’avoir une minéralisation importante de la matière organique. Après dix semaines d’expérimentation, aucun signe de colmatage n’a été signalé, le taux de réduction des MES, de la DCO totale, de la DCO dissoute et des composés phénoliques est d’environ 70 %, 79 %, 76 % et 81 % respectivement. Le traitement subséquent par le mélange des trois plantes montre une augmentation du pH et de la conductivité électrique et une élimination importante de la DCO totale (99,7 %), de la DCO dissoute (99,5 %), des MES (94 %) et des polyphénols (95 %).À la lumière des résultats trouvés, on conclut que le traitement des margines par la combinaison de deux systèmes (filtre à sable et lit planté) permet une élimination importante de la charge organique des margines.The objective of this study consisted of testing the potential of a sand filter to decrease the organic pollutants in olive mill wastewater (OMW) diluted to 50% with domestic wastewater, and to polish the treatment by using a mixture of aquatic plants: Phragmites australis, Typha latifolia and Arundo donax. The experimental pilot consists of a sand filter followed by a planted system. The sand filter is filled with 50 cm of sand and 10 cm of gravel at the top and the bottom of the filter. The feed (4 cm•j‑1) is done sequentially according to a one-day wet / three days dry cycle. In order to activate the degradation processes in the sand filter, OMW are diluted to 50% with domestic wastewater. The second step of the treatment consists of a tank (1x1x1 m3) filled with 20 cm of gravel and 60 cm of soil planted with a mixture of aquatic plants at a density of 8 young plants•m‑2 for each plant and irrigated two times in the week by 20 L of pre-filtered OMW.The results show that the sand filter ensures a neutralization of the OMW pH, which passes from 4.79 to 7.68. The enrichment of the sand by the micro-organisms ensures an important mineralization of the organic matter. After ten weeks of operation of this system without clogging sign, the rate of abatement of the TSS, total COD, dissolved COD and phenolic compounds was about 70%, 79%, 76% and 81% respectively. Completion of the treatment by the mixture of three plants shows an increase in the pH, electric conductivity and a significant elimination of the total COD (99,7%), dissolved COD (99,5%), TSS (94%) and polyphenols (95%).With regard to OMW treatment efficiency, the treatment of the OMW by the combination of two systems (sand filter and planted system) results in a significant removal of the organic load of the OMW

Traitement des margines d’une huilerie moderne par infiltration-percolation sur un filtre à sable

Les différentes techniques d’extraction d’huile d’olive aboutissent à la formation des margines en quantités variables, allant de 400 à 500 L•t‑1 d’olives pour les unités traditionnelles et une tonne de margines•t‑1 d’olives pour les unités modernes.L’objectif de notre travail est de montrer la faisabilité du traitement des margines par la technique d’infiltration-percolation sur filtre à sable et d’étudier l’effet de la dilution des margines par des eaux usées urbaines à 50 % sur la stimulation de la biodégradation dans le filtre et sur les performances épuratoires de cette technique. Les effluents testés ont un pH très acide (4,93) et sont très chargés en matières organiques, en demande chimique en oxygène (DCO) (28 g d’O2•L‑1) et en polyphénols (1,42 g•L‑1). Après dilution à 50 % par les eaux usées urbaines, le pH augmente à 5,01, la DCO et les polyphénols diminuent respectivement à 25,58 g d’O2•L‑1 et 1,39 g•L‑1. Le traitement des margines brutes par le filtre à sable a permis une élimination de 36 % de la DCO brute, 33 % de la DCO dissoute, 53 % des polyphénols, 67 % de l’azote Kjeldahl (NTK) et 75 % de l’azote ammoniacal. Les essais de percolation des margines mélangées à 50 % avec les eaux usées urbaines dans une colonne de sable montrent une amélioration de l’efficacité quant à l’élimination de la DCO brute (76 %), de la DCO dissoute (92 %), des polyphénols (90 %), de NTK (50 %) et de l’ammonium (87 %).Industrial olive oil production is of fundamental economic importance for many countries from the Mediterranean Sea. However, during olive oil production, large amounts of polluted waters, known as olive mill wastewaters (OMW), are generated. Discharge of this effluent into receiving waters without treatment leads to serious environmental problems in these countries. Many studies have been undertaken to find efficient treatment systems and several techniques have been tested, but there have been few studies investigating sand filters for this type of effluent. The purpose of this work was to test the suitability of sand filters to treat olive mill wastewater, specifically by a 50% dilution of OMW with domestic wastewater. Results show that the initial OMW had an acidic pH (4.93) due to the presence of substances such as phenolic acids and fatty acids. The electrical conductivity was very low (9.6 mS•cm‑1) compared to that reported from urban effluents in Marrakech (Morocco). This OMW contained high amounts of phenolic substances (1.42 g•L‑1), total Chemical Oxygen Demand (28 g COD•L‑1) and dissolved Chemical Oxygen Demand (18 g COD•L‑1). During the first week, the treatment of the raw OMW with a sand filter allowed an increase of pH (from 4.93 to 7) and electrical conductivity (from 10.2 to 15.4 mS•cm‑1), and a reduction of the following parameters: total COD (36%), dissolved COD (33%), phenol contents (53%), total Kjeldahl nitrogen NTK (67%) and ammonium (75%). In a sand column, percolation of diluted OMW with domestic wastewater allowed an increase of pH (8.03) and significantly improved the removal efficiency of total COD (76%), dissolved COD (92%), phenols (90%), NTK (50%) and ammonium (87%)

Caractérisation des margines issues d’une huilerie moderne et essais de leur traitement par coagulation-floculation par la chaux et le sulfate d’aluminium.

L’objectif de ce travail est de réaliser une caractérisation complète des margines brutes et décantées et d’étudier la diminution de la charge organique et des polyphénols en utilisant les techniques de coagulation-floculation.Les essais de coagulation ont été réalisés à l’aide d’un banc de jar-test, constitué d’une série de six béchers. La série comporte une suspension témoin sans addition de coagulant ainsi que la même suspension soumise à des doses croissantes du coagulant (la chaux seule, le sulfate d’aluminium seul et la chaux combinée avec le sulfate d’aluminium).Les tests de coagulation-floculation montrent que l’application de sulfate d’aluminium à une dose de 1,5 g/L et à un pH entre 6,31-7,08 permet d’éliminer 40 % de la DCO, 27 % des MES et 41 % des polyphénols, tandis que l’application de la chaux à une dose de 20 g/L permet d’éliminer 43 %, 75 % et 50 % de la DCO, des polyphénols et des MES respectivement. La combinaison d’une dose de 1,5 g/L de sulfate d’aluminium et de 20 g/L de chaux permet de réduire 70,5 % des MES, 38 % de la DCO, 54 % des polyphénols et 61 % de la coloration.Il ressort de l’ensemble des résultats que le meilleur traitement par coagulation-floculation est obtenu par l’application de la chaux seule à une dose de 20 g/L et par la combinaison de 1,5 g/L de sulfate d’aluminium et de20 g/L de chaux.Olive mill wastewaters (OMW) are a significant source of environmental pollution, especially in important olive oil producing countries such as Spain, Italy, Greece, Tunisia, Morocco, Turkey, Lebanon, Syria and Portugal. When discharged into the environment, olive mill wastewaters create serious environmental problems, such as colouring of natural waters, alteration of soil quality, phytotoxicity and nuisance odours.Several methods have been reported for the removal of pollutants from these effluents. These technologies can be divided into three categories: biological, chemical and physical. Physical-chemical treatment is well known and has yielded promising results. Several authors have tested coagulation-flocculation techniques using different coagulants, such as aluminium sulphate, ferric chloride, ferric sulphate and lime, but there are few studies that have investigated the combined effect of a mixture of coagulants.The objectives of this work were to carry out a complete characterization of the raw and decanted olive mill wastewater, resulting from a modern unit located in the Marrakesh region, and to study the reduction in organic load and phenol content achievable by coagulation-flocculation using two different coagulants (lime, aluminium sulphate) and their combination. The quantity of sludge produced by the different coagulants was also determined.Coagulation tests were realized using jar test equipment in a series of six flasks. One flask corresponded to a control suspension without adding any coagulant. The other suspensions were treated with increasing coagulant concentrations of lime or aluminium sulphate, used separately (concentrations varying from 0 to 30 g/L and from 0 to 3 g/L, respectively) or in mixture. All solutions were stirred first for 3 min at 130 rpm, and then after the coagulant addition for 20 min at 30 rpm, followed by 1 h settling. Solution pH was adjusted to the desired value with sulphuric acid (4 N) or NaOH (5 N) before the coagulant was added. The supernatant was separated from the precipitate for analysis and the sludge was determined gravimetrically after drying at 100°C for 4h.Raw olive mill wastewaters are acidic (pH 4.55) and due to this low pH value biological treatment of OMW is limited. OMW are also highly saline (electric conductivity 8.4 mS/cm), due to the salting practiced to preserve olives during trituration. These effluents contain also high loads of Chemical Oxygen Demand (COD of 72 g/L) and toxic polyphenols (1.4 g/L). Comparison of the characteristics of the raw and decanted olive mill wastewater showed that decantation for 3 months did not seem to affect the physical-chemical characteristics of the studies olive mill effluent, except for the concentration of the total suspended solids (TSS), which passed from 57 to 32 g/L.Coagulation-flocculation tests showed that the application of aluminium sulphate without correction of the pH caused a small decrease of the pH from 4.67 to 4.54. The optimal elimination of the polyphenols (23%), TSS (24%) and colour (15%) was obtained with an amount of 1.5 g/L, whereas the optimum for elimination of COD (50%) was obtained with an amount of 1.8 g/L. These abatements demonstrate that the studied pH range did not allow very important elimination of the polluting loads, in particular for polyphenols. Adjust of the pH to 6.31-7.08 led to a slight improvement in the percentage of reduction of TSS (27%) and COD (40%), and the abatement of polyphenols passed from 23% to 41%. This application of aluminium sulphate alone generated only a small quantity of sludge, corresponding to the low degree of TSS removal. Lime application involved an increase in pH up to an addition of 15 g/L, after which the pH stabilized around 12. A lime application of 20 g/L resulted in the reduction of COD (43%), TSS (50%) and an important elimination of polyphenols (75%); sludge produced sludge after coagulation was significant (35 g/L).The successive addition of lime to 1.5 g/L of aluminium sulphate raised the pH, starting from an amount of 10 g/L, and induced a removal of TSS (71%), COD (38%), polyphenols (54%) and colour (61%) at a dose of 20 g/L of lime. The successive addition of aluminium sulphate to 15 g/L of lime involved only a slight variation of the pH and allowed the elimination of TSS (48%), COD (36%), polyphenols (35%) and colour (70%) at a dose of 3 g/L of aluminium sulphate. Comparison between the two coagulant combinations indicated that the best TSS removal was obtained for an amount of 1.5 g/L of aluminium sulphate and 20 g/L of lime, but with a production of 40 g/L of sludge. In the case of the elimination of colour, the best combination was obtained for a dose of 3 g/L aluminium sulphate and 15 g/L of lime, with a production of only 30 g/L of sludge. All in all, the best coagulation-flocculation was obtained by application of 20 g/L of lime (used alone) and by the combination of 1.5 g/L of aluminium sulphate and 20 g/L of lime, which gave a better elimination of the colloidal particles, a good reduction of the organic matter causing colour and the toxic polyphenols. The quantity of the sludge produced from the test with lime alone was 35 g/L, whereas the combination of lime and aluminium sulphate produced 40 g/L. Analysis of variance showed that the production of sludge for the two coagulants did not present statistically significant differences (p>0.05)

Soluble microbial products and performances assessment during OMW biological treatment by an activated sludge pilot

Olive mill wastewater (OMW) is currently one of the most serious environmental pollution problems, because of its high potential to contaminate surface and ground waters. Untreated OMWW is a major problem for the wastewater treatment plants (WWTP) based on activated sludge because of its phenolic compounds content which inhibit microbial activity and growth.This paper aims to assess the soluble microbial products (SMP) and treatment performances in activated sludge pilot plant (ASPP) depending the increasing OMW mass ratio F/M. The results highlight optimal performances of the system during the experiment. Indeed, the biomass concentration in bioreactor of ASPPwas high and reached5.71 gMLSS.L-1 for mixed liquor suspended solids (MLSS) and 4.86 gMLVSS.L-1for mixed liquor volatile suspended solids (MLVSS),the respirometric activity was very promising of about 9.95 mgO2.gmlvss-1.h-1which indicates good promptness of the biomass against the OMW increasing feedings. The results show also an important abatement of COD and polyphenols which both reached more than 90%. Moreover, HPLC analysis shows an important abatement of the most toxic polyphenols present in OMW, hydroxtyrosol and tyrosol.The SMP have a crucial importance for biological wastewater treatment systems because of their significant impacts on both treated effluent quality and treatment efficiency. In this study, their concentrations were significantly influenced by OMW increasing mass ratio F/M. Consequently, they reached a stable concentrations at end of the experimental study of 8 mg.L-1 for proteins and 17 mg.L-1 for polysaccharides

Traitement des eaux usées domestiques par un chenal algal à haut rendement (CAHR) agité par air lift sous climat semi-aride

De nombreux travaux de recherche ont montré l’efficacité des systèmes de traitement extensifs tels que le lagunage naturel et leur adaptabilité aux conditions climatiques et socio-économiques pour des pays comme le Maroc. Le lagunage à haut rendement est une variante de lagunage naturel qui a pu démontrer ses meilleurs performances épuratoires et son efficacité.Le but de la présente étude est : i) de déterminer les différents paramètres hydrauliques d’un chenal algal pilote fonctionnant avec un air lift; ii) d’étudier son fonctionnement et d’évaluer ses performances épuratoires (physicochimiques et bactériologiques), sous les conditions climatiques semi-arides de la ville de Marrakech. Il faut signaler que ce système d’agitation par air lift sera testé pour la première fois au Maroc.L’étude hydrodynamique a pu démontrer que les vitesses d’écoulement calculées pour le pilote fonctionnant avec un air lift rentrent dans la gamme des vitesses d’écoulement recommandées pour ce genre de système et avec d’autres systèmes d’agitation comme la roue à aubes qui est la plus souvent utilisée dans ce genre d’installation. Également, la capacité d’oxygénation du chenal est plus importante.L’étude physicochimique a porté sur le suivi des paramètres de charge organique (DCO et DBO5) et de nutriments (azote et phosphore), tout en utilisant des méthodes d’analyse standards. En matière de DBO5, la filière élimine environ 44 %, alors que les teneurs en DCO brute de l’effluent traité restent élevées. Dans ce genre de système (CAHR), on assiste à une transformation de la matière organique entrante sous forme de biomasse algale, ce qui explique les faibles performances du chenal en matière de DCO brute. Contrairement à la charge organique, le chenal a montré une efficacité remarquable dans l’élimination des nutriments (77 % pour PO4 et 90 % pour NH4).Arid and semi-arid climate areas such as Morocco are affected by water shortages, especially shortages in the water intended for irrigation. In this particular climatic context, the reuse of treated wastewater may partly contribute to solving this problem. Currently, a number of studies have shown the effectiveness of extensive treatment systems and their adaptability to Moroccan socio-economic conditions. The high rate algal pond (HRAP) is an efficient alternative to natural lagoons. The objective of this study was (i) to determine the various hydraulic parameters of a HRAP equipped with an air-lift agitation system, and (ii) to study its operation and to evaluate its performance (physico-chemical and bacteriological) under the semi-arid climatic conditions of Marrakech. The hydrodynamic study showed that the flow rates calculated for the pilot HRAP equipped with the air-lift met the flow range rates recommended for this installation and those of other agitation systems often used, such as the paddlewheel. The physico-chemical study related to the monitoring of organic load parameters (Chemical Oxygen Demand, COD; Biochemical Oxygen Demand, BOD5) and nutrients (nitrogen and phosphorus), was done in accordance to standard methods. For BOD5, the system eliminated approximately 44%, whereas total COD remained high. In the HRAP system, the transformation of the incoming organic matter into algal biomass was expected, and explains the weak performances of the HRAP with respect to total COD. In contrast to the results for the organic load, the pond system showed a remarkable efficiency for the elimination of nutrients (77% for PO4 and 90% for NH4)

reuse study of sustainable wastewater in agroforestry domain of marrakesh city

The current work aims to perform a feasibility study of sustainable urban wastewater reuse in agroforestry domain of Marrakesh city in order to assess the environmental and the sustainability of urban wastewater reuse in agroforestry irrigation. To this end, wastewater physicochemical characteristics from Marrakesh full-scale wastewater treatment plant, soil physicochemical analysis and climate analysis were investigated. Finally, treated urban wastewater potential production in Marrakesh WWTP and challenge related to its reuse are provided. The obtained results of the present study reveals the feasibility of this practice in Marrakesh region. Regarding the actual situation, climate analysis highlight that the local climatic conditions is an ultimate challenge for water resources; soil analysis reveals a loss of soil fertility due to the decline in soil organic matter. To face this condition, treated urban wastewater reuse is a sustainable and promising strategy to face water scarcity, enhance soil fertility, preserve natural resources, develop local products and improve living conditions of agriculture and farmers. Keywords: Urban wastewater, Physicochemical analysis, Wastewater reuse, Climate analysis, Arid climate, Marrakes

Speciation of Heavy Metals in the Soil and the Tailings, in the Zinc-Lead Sidi Bou Othmane Abandoned Mine

Mining activity is one of the most important sources of Heavy metals in the environment. In Marrakech region, functioning or abandoned mines represent a great hazard due to huge amounts of waste deposited in waste dumps and tailings often with high concentration of heavy metals pollution. These mining sites located near Marrakesh contain tailings abandoned for ten to twenty years. The present study was realized for the abandoned mine of Sidi Bou Othmane  in order: i) -To determine the total content of heavy metal in soil and Tailings, ii)-To carry out the chemical speciation, of heavy metals in the Tailing and in the samples of soil collected in the vicinity of the  mine. The pH, the electrical conductivity, Organic matter content and total carbonate content in all the samples (soil and Tailings) were measured using the standards methods, heavy metals concentration was determined by ICP-MS. Therefore, a sequential extraction scheme according to the BCR’s (Community Bureau of Reference) guidelines and total acid digestion were applied to soil and Tailings samples.  The results obtained showed that the abandoned mine of Sidi Bou Othmane still containing very important quantities of solid waste, these site can become potential source of pollution by releasing heavy metals. In this concern, 4 polluting heavy metals (Cd, Cu, Pb and Zn) were detected with concentrations exceeding those admitted for agricultural soil. For all heavy metals, the most contaminated sites were found in the vicinity of the mine, probably linked to weathering effect, the wind and the topography. Keywords: Soil, tailings, heavy metals, sequential extraction, speciation

Green chemistry for treatment of liquid discharges from a dyeing industry: bio coagulation and flocculation

Textile industry is among the highly polluting industries in water effluent. It consumes large quantities of water and chemicals compounds. These releases can have varying characteristics regarding their volumes and pollutants concentrations. Therefore, adverse effects can be observed as consequence on environment and biodiversity. According to the environmental protection regulations in Morocco, the treatment of this water before discharge is compulsorily to avoid pollution of surface and ground water. The aim of our study is the treatment of these effluents by a physicochemical process using coagulation / flocculation.  Two coagulants of different type and purity are used. The first one “aluminum sulfate” is a pure coagulants used on industrial scale. The second “alum stone” is excerpt from the nature of Moroccan desert. Beside, two flocculants are compared, a natural extract from cactus and a polymer synthesized (polyacrylamide). The comparative study between a pure coagulant and a biocoagulant, with the two flocculants, showed a very good absorbency rate of reduction (ABS), turbidity (T), chemical oxygen demand (DCO), dry matter (DM) and chemical elements (sodium, lithium, nitrogen, phosphorus, boron, and silicon). By the jar test treatment process, the optimal dose of coagulants and flocculants to use in the neutral pH treatment was identified. The optimal dose used gives 85% of abatement efficiency absorbance, 90 % for turbidity and 80% for the chemical oxygen demand. Moreover, the dry matter content is over 25% and over 90% for some chemical elements