The addition of acid is used to achieve the proper pH unlike sweep treatment were the operator overdoses the coagulant to achieve the correct pH range. At pH values above 7, the removal performance of aluminum-based coagulants drops markedly. The raw tannery effluent was bluish-black in colour, mildly basic in nature, with high COD 4000mg/l and turbidity in the range 700NTU, was diluted and dosed with organic coagulants, AloeVera, MoringaOleifera and Cactus (O.ficus-indica).. Coagulation is an essential part of drinking water treatment process. The data sheets will mention the density as well as the percentage of alum (or other) in each product. Post-filtration pH adjustment may be necessary to optimize corrosion control and comply with other … An automated device for determining the coagulant dose is the Streaming Current Detector (SCD). A higher than the optimum dose of coagulant thus results in less turbidity removal. Introduction Turbidity is one of the important physical parameters of water that representing the amount of suspended solids, (Kawamura, 2000; Daneshvar, 2009). Will the natural alkalinity of water be sufficient to satisfy reaction with alum? BTJCM (Civil/Environmental) (OP) 3 Oct 18 08:05. At higher dosa-ges of the coagulant … Look it up now! optimal coagulant dose for a particular raw water. It was observed that the optimum dose for alum obtained through the traditional method was 12 mg/l, while the value for polymer was set constant at 0.020 mg/l. As evidenced with Fig. Epic Machines Recommended for you The goal of the lab was to determine the optimum coagulation dosage for alum and possibly soda ash for this water source. The turbidity value is proportional to the amount of colloid and suspended solids in water that cannot be deposited in usual ways. Optimum operation conditions were: an organic load of 25% of the total dose, total coagulants dose of 10 ppm, pH of 6 with an estimation of high turbidity value of 100 NTU. Ferric sulphate. Optimum pH for the coagulation operation obtained through traditional methods and RSM was 7.6. At this value (0), the coagulant dose can be said to be optimum. The optimum coagulant dosage in a coagulation process is pH dependent and should be established based on an on-site jar or pilot testing for the site-specific conditions of a given application. 2 and 3, with the corresponding amounts of R 2 and MSE shown in Table 4. Common criteria include supernatant turbidity after settling, and filtrationthrough filter papers. … The jar test may be briefly described as follows: A series of samples of water are placed on a special multiple stirrer and the samples, typically 800 ml in 1-litre beakers (or jars), are dosed with a range of coagulant, e.g. The amount of waste water that passes for 4 hours is 18000 liters. When the issue of the coagulant dosage is solved, the optimum pH range for coagulation is also a undergoing topic. However the turbidity values change temporarily on the water, affecting the effectiveness of this process, due to each turbidity value may need a different coagulant dose [2]. Through RSM optimization, the optimum dose for alum was 7 mg/l and for polymer was 0.004 mg/l. The model has also achieved reasonable accuracy in predicting the amount of the residual aluminum of the treated water with an R 2 of 0.93 and a MSE of 0.37 mg L −1.. Depending on the type of coagulant used, the dosage will vary. Ferric sulphate is available as a commercial water treatment coagulant in the form of an anhydrous material that may be transported and stored in wooden barrels. Polymers also reinforce flocs . It is used to agglomerate suspended solids together into larger bodies. In adsorption/charge neutralization, it is found that excessive dosage results in charge reversal and a negative effect on process performance. The enhanced coagulation process is used to remove natural organic matter by adjusting the pH and coagulant dose to remove the greatest amount of suspended matter during the treatment process. The students conducted various jar tests with UV254 to determine which chemical combination would produce the best finished water quality results. 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