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机构地区:[1]西安建筑科技大学环境与市政工程学院,陕西西安710055
出 处:《水处理技术》2014年第7期71-75,共5页Technology of Water Treatment
基 金:高等学校博士学科点专项科研基金(20116120110008);陕西省自然科学基础研究计划重点项目(2010JZ008);国家水体污染控制与治理科技重大专项(2009ZX07212-002-004-003)
摘 要:采用多级组合曝气生物滤池(MBAF)工艺在低温时对城市污水处理厂二级出水进行深度处理,研究了气水比及碱度对NH4^+-N、浊度及COD去除效果的影响,并确定优化工艺条件。结果表明,在水力负荷为5m^3/(m^2·h),进水NH4^+-N的质量浓度为30mg/L的条件下,当水温在12~20℃时,气水体积比由1:1增加到3:1时,NH4^+-N去除率增加了近30%,在气水比为3:1,碱度为428mg/L时达到最佳去除效果,去除率达到98.73%,出水NH4^+-N的质量浓度为0.38mg/L;由于二级出水可生化性较差,对COD的去除效率不高于30%。在浊度、COD、NH4^+-N含量及出水碱度均满足GB 50050-2007要求的条件下,MBAF优化气水体积比2:1、进水碱度为321mg/L。The multi-stage biological aerated filter (MBAF) was employed for tertiary treatment of municipal wastewater. The effects of gas/liquid ratio and alkalinity on the performance of the MBAF were investigated. The optimal operation conditions were also determined. The results show that, under the conditions of the hydraulic loading rate (HLR) of 5 m^3/(m^2·h) and the infiuent mass concentration of NH4^+-N is 30 mg/L, the NH4^+-N removal efficiency increases by 30% approximately with the gas/liquid ratio increased from 1:1 to 3:1 when the temperature ranged from 12-20 ℃. When the gas/liquid volume ratio is 3:1 and alkalinity is 428mg/L, the optimal NH4^+-N removal efficiency of 98.73% achieved, and mass concentration of NH4^+-N of effluent is below 0.38 mg/L. The COD removal efficiency is less than 30% due to the poor biodegradability of secondary effluent. While, the optimal gas/liquid volume ratio and the alkalinity are determined as 2:1 and 321 mg/L, respectively, for ensuring the COD, turbidity, content of NH4^+-N removal and the alkalinity of the effluent to meet the requirement of GB 50050-2007.
关 键 词:多级组合曝气生物滤池 二级出水 深度处理 气水比 碱度
分 类 号:X703.1[环境科学与工程—环境工程]
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