Pre-treatment optimisation studies for secondary effluent reclamation with reverse osmosis |
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Authors: | López-Ramírez J A Sahuquillo S Sales D Quiroga J M |
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Affiliation: | Faculty of Marine and Environmental Sciences, Department of Chemical Engineering, Food Technology and Environment Technologies, University of Cádiz, Polígono Río San Pedro, s/n. 11510, Puerto Real, Cádiz, Spain. juanantonio.lopez@uca.es |
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Abstract: | Physical-chemical pre-treatment was used for the reverse osmosis unit for reclamation of secondary effluents. The pilot plant was equipped with a variety of tertiary treatment units to prevent fouling and biofouling of the cellulose-acetate reverse osmosis membranes used. The optimisation of pre-treatment involved application of various concentrations of lime to raise the pH to 10.3-12.1, and to stabilise the sludge generated, as well as different dosages of ferric chloride (15, 20, and 25 mg/L) for the coagulation and solid-liquid separation. Sodium hypochlorite (8 mg/L) and UV disinfection are used for microbiological control. The water quality obtained, under the optimum conditions (pH=10.5; FeCl(3): 25 mg/L; anionic flocculant: 0.5 mg/L; sodium hypochlorite: 8 mg/L) was high, showing an average conductivity of 66 microS/cm and low COD values 4 mg O(2)/L. The product water is suitable for injection into a groundwater aquifer to counteract seawater intrusion. |
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Keywords: | Cellulose-acetate membranes Lime clarification Pilot plant Reclamation Reuse Reverse osmosis |
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