Abstract
A combined process including integrated ozone-BAFs (ozone biological aerated filters) and membrane filtration was first applied for recycling textile effluents in a cotton textile mill with capacity of 5000m3/d. Influent COD (chemical oxygen demand) in the range of 82–120mg/L, BOD5 (5-day biochemical oxygen demand) of 12.6–23.1mg/L, suspended solids (SSs) of 38–52mg/L and color of 32–64° were observed during operation. Outflows with COD⩽45mg/L, BOD5⩽7.6mg/L, SS⩽15mg/L, color⩽8° were obtained after being decontaminated by ozone-BAF with ozone dosage of 20–25mg/L. Besides, the average removal rates of PVA (polyvinyl alcohol) and UV254 were 100% and 73.4% respectively. Permeate water produced by RO (reverse osmosis) could be reused in dyeing and finishing processes, while the RO concentrates could be discharged directly under local regulations with COD⩽100mg/L, BOD5⩽21mg/L, SS⩽52mg/L, color⩽32°. Results showed that the combined process could guarantee water reuse with high quality, and solve the problem of RO concentrate disposal.
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