Fenton氧化-序批式膜生物反应器耦合处理干法腈纶废水

Treatment of dry-spun acrylic fiber wastewater by combined Fenton oxidation and sequencing batch membrane bioreactor

采用Fenton氧化-序批式膜生物反应器(SBMBR)组合工艺处理干法腈纶废水。结果表明,在废水初始pH值为3.0,H2O2投加量为90.0 mmol/L,Fe2+投加量为20.0 mmol/L,反应时间为2.0 h的条件下,Fenton氧化预处理对腈纶生产废水的COD去除率达到47.0%以上,COD由1 091 mg/L降至560 mg/L,废水的BOD5/COD由0.32升至0.69,废水的可生化性得到显著提高。Fenton处理出水与丙烯腈废水等比例混合后,采用SBMBR进行生化处理,在水力停留时间为24 h,90 min缺氧/150 min好氧交替运行的条件下,COD、NH4+-N和TN的平均去除率分别为71.7%、97.2%和47.4%,碳源不足是限制TN去除效果的主要影响因素。在无外加碳源的条件下,组合工艺处理后出水COD和NH4+-N浓度分别为117 mg/L和1.7 mg/L,出水水质可以稳定达到国家一级排放标准(GB8978-1996)。

A combined Fenton-sequencing batch membrane bioreactor （SBMBR） process was developed for the treatment of dry-spun acrylic fiber wastewater. Under the optimum conditions of 90.0 mmol/L H202 , 20.0 mmol/L Fe2~ , pH 3.0 and 120 rain reaction time, the COD of dry-spun acrylic fiber manufacturing wastewater decreased from 1 091 mg/L to 560 mg/L, corresponding to above 47.0% COD removal, and the BODs/COD ra- tio increased from 0.32 to 0.69. As for the biological treatment, the mixture liquor of Fenton effluent and acrylo- nitrile wastewater was fed to SBMBR system. Under the designed operation conditions of 90 min anoxic/150 min aerobic cyclic operation and HRT of 24 h, the average COD, NH4＋ -N and TN removal efficiencies were 71.7% , 97.2% and 47.4% , respectively. Lacking of carbon source was the main limiting factor for TN removal. With- out carbon source supplement, the effluent COD and NH4＋ -N concentrations were 117 mg/L and 1.7 mg/L, re- spectively, which could steadily meet the National Discharge Standard of China of Grade I （GB8978-1996）.