膜生物反应器与粉末活性炭-膜生物反应器除污染特性对比研究

COMPARISON OF THE PERFORMANCE OF MEMBRANE BIOREACTOR AND POWDERED ACTIVATED CARBON-MEMBRANE BIOREACTOR

采用膜生物反应器(MBR)和粉末活性炭-膜生物反应器(PAC-MBR)两种工艺处理微污染原水,考察了两阶段进水情况下的除污染效能及初始有机物和氨氮质量浓度对各工艺除污染特性的影响。结果表明,进水有机物含量对MBR和PAC-MBR除污染的效果有较大的影响,当CODMn由(3.67±0.11)mg/L增加至(4.11±0.23)mg/L时,两种工艺对CODMn的去除率分别由(23.1±9.8)%和(37.6±5.5)%增加至(35.4±12.6)%和(43.1±17.0)%。两个阶段各工艺出水的NH3-N质量浓度均小于0.4 mg/L,且系统连续运行过程中出水的NO2--N质量浓度分别低至(7.5±5.8)μg/L和(6.1±3.6)μg/L,显著低于原水中的平均值(76.9±7.6)μg/L。同时发现PAC-MBR工艺中PAC延长了微生物与有机物的接触时间,并为微生物生长提供了载体,可有效提高细菌的总耗氧速率(SOUR),并使生物处理系统中的有机物浓度的临界值降低,从而有效提高整个生物处理系统中有机物和氨氮的去除率。

Membrane bioreactor（MBR） and powdered activated carbon-membrane bioreactor （PAC-MBR） systems were used for treating micro-polluted raw water, and a two-stage study was conducted to systematically investigate the performance of the two systems and the effects of influent organic content and, initial concentration of ammoniaon on it. The study showed that with the regular influent concentrations of CODMn increasing from （3.67±0.11） mg/L to （4.11±0.23） mg/L, CODMn removal increased from （23.1 ±9.8）% and （37.6±5.5）% to （35.4±12.6）% and （43.1±17.0）% from MBR and PAC-MBR systems, respectively. The effluent concentrations 0f NH3-N at two stages were less than 0.4 mg/L, and MBR and PAC-MBR normally had a NO2-N of （7.5±5.8）μg/L and （6.1±3.6）μg/L, respectively, significantly lower than the average of the raw water. In the PAC-MBR process, PAC extended the contact time of organics and ammonia and provided a carrier for microbial growth, then increased the oxygen uptake rate for the total bacteria and reduced the critical value for influent organic content, therefore effectively improved the removal of organics and ammonia.