title: Treatment of linear alkylbenzene sulfonate (LAS) wastewater by internal electrolysis--biological contact oxidation process.
abstract: Surfactant wastewater is usually difficult to treat due to its toxicity and poor biodegradability. A separate physico-chemical or biochemical treatment method achieves a satisfactory effect with difficulty. In this study, treatment of the wastewater collected from a daily chemical plant by the combination processes of Fe/C internal electrolysis and biological contact oxidation was investigated. For the internal electrolysis process, the optimal conditions were: pH = 4-5, Fe/C = (10-15):1, air-water ratio = (10-20):1 and hydraulic retention time (HRT)= 2 h. For the biological contact oxidation process, the optimal conditions were: HRT = 12 h, DO = 4.0-5.0 mg/L. Treated by the above combined processes, the effluent could meet the I-grade criteria specified in Integrated Wastewater Discharge Standard of China (GB 8978-1996). The results provide valuable information for full-scale linear alkylbenzene sulfonate wastewater treatment.
authors: State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tong]i University, Shanghai 200092, China.
authors: X Z
authors: XZ
authors: Cao
authors: Y M
authors: YM
authors: Li
mesh_terms: D017738:Alkanesulfonic Acids / Q000737:chemistry*; D001673:Biodegradation, Environmental; D002244:Carbon / Q000737:chemistry; D002681:China; D004572:Electrolysis; D006863:Hydrogen-Ion Concentration; D007501:Iron / Q000737:chemistry; D010084:Oxidation-Reduction; D014865:Waste Disposal, Fluid / Q000295:instrumentation / Q000379:methods*; D018508:Water Purification / Q000295:instrumentation / Q000379:methods*
chemical_list: D017738:Alkanesulfonic Acids; C030641:alkylbenzyl sulfonic acid; D002244:Carbon; D007501:Iron