Combination of ozonation, activated carbon, and biological aerated filter for advanced treatment of dyeing wastewater for reuse

• Published in: Environmental science and pollution research international Vol. 22; no. 11; pp. 8174 - 8181
• Main Author: Zou, Xiao-ling
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer-Verlag 01-06-2015; Springer Berlin Heidelberg; Springer Nature B.V
• Subjects: Activated carbon; Aquatic Pollution; Atmospheric Protection/Air Quality Control/Air Pollution; Biochemical oxygen demand; biodegradability; Biodegradation; biofilters; Biological; Biological Oxygen Demand Analysis; Carbon - chemistry; Chemical oxygen demand; chemical structure; Color; Coloring Agents - chemistry; Coloring Agents - toxicity; Cotton; Decomposition; Dyeing; Dyes; Earth and Environmental Science; Ecotoxicology; Effluents; Environment; Environmental Chemistry; Environmental Health; Environmental science; Experiments; Filtration - methods; Genotoxicity; Microorganisms; Mutagenicity Tests; Oxidants - chemistry; Ozonation; ozone; Ozone - chemistry; Performance evaluation; Pollutants; Recycling - methods; Research Article; Retention time; Reuse; Studies; Surfactants; Textile industry; Textiles; Waste Disposal, Fluid - methods; Waste Water - chemistry; Waste Water - toxicity; Waste Water Technology; wastewater; Wastewater reuse; Wastewater treatment; Water Management; Water Pollutants, Chemical - chemistry; Water Pollutants, Chemical - toxicity; Water Pollution Control; Water reuse; Water treatment; Ozonation; COD; Decolorization; Mineralization; Genotoxicity
• ISSN: 0944-1344; 1614-7499
• DOI: 10.1007/s11356-015-4423-9

Laboratorial scale experiments were performed to investigate and evaluate the performance and removal characteristics of organics, color, and genotoxicity by an integrated process including ozonation, activated carbon (AC), and biological aerated filter (BAF) for recycling biotreated dyeing wastewater (BTDW) collected from a cotton textile factory. Influent chemical oxygen demand (COD) in the range of 156 − 252 mg/L, 5-day biochemical oxygen demand (BOD₅) of 13.5 − 21.7 mg/L, and color of 58 − 76° were observed during the 20-day continuous operation. Outflows with average COD of 43 mg/L, BOD₅of 6.6 mg/L, and color of 5.6° were obtained after being decontaminated by the hybrid system with ozone dosage of 0.25 mg O₃ₐₚₚₗᵢₑd/mg COD₀, 40 min ozonation contact time, 30 min hydraulic retention time (HRT) for AC treatment, and 2.5 h HRT for BAF treatment. More than 82 % of the genotoxicity of BTDW was eliminated in the ozonation unit. The genotoxicity of the BAF effluent was less than 1.33 μg 4-nitroquinoline-N-oxide/L. Ozonation could change the organics molecular structures, destroy chromophores, increase the biodegradability, and obviously reduce the genotoxicity of BTDW. Results showed that the combined process could guarantee water reuse with high quality.