Fenton氧化-序批式膜生物反应器耦合处理干法腈纶废水

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)。

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

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 H₂O₂, 20.0 mmol/L Fe²⁺, pH 3.0 and 120 min 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 BOD₅/COD ratio increased from 0.32 to 0.69. As for the biological treatment, the mixture liquor of Fenton effluent and acrylonitrile 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. Without carbon source supplement, the effluent COD and NH₄⁺-N concentrations were 117 mg/L and 1.7 mg/L, respectively, which could steadily meet the National Discharge Standard of China of Grade I (GB8978-1996).