Treatment of wastewater from the textile industry

A description is given of the plant for treatment of waste waters from a textile mill in Cyprus. Treatment included screening, pre-aeration, air flotation for removal of oil and grease, coagulation with ferrous sulphate and hydrated lime, the activated sludge process, and chlorination. The effluent then received tertiary treatment by high-rate, multi-layer, granular filtration in 2 pressure filters in series, with addition of chlorine, alum, and polymer, before use for irrigation. The composition of the waste water before and after the different stages of treatment, and the provisional standards for treated waste waters for irrigation of various types of vegetation and crops, are tabulated.