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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。
Micro-polluted raw water was treated with membrane bioreactor (MBR) and powdered activated carbon-membrane bioreactor (PAC-MBR). The effects of two-stage water infiltration on decontamination efficiency and initial concentration of organic matter and ammonia nitrogen Effect of process decontamination characteristics. The results showed that the content of organic matter in influent had a significant effect on the decontamination of MBR and PAC-MBR. When CODMn was increased from (3.67 ± 0.11) mg / L to (4.11 ± 0.23) mg / L, The CODMn removal rates increased from (23.1 ± 9.8)% and (37.6 ± 5.5)% to (35.4 ± 12.6)% and (43.1 ± 17.0)%, respectively. The concentration of NH3-N in each process effluent was less than 0.4 mg / L during the two stages, and the NO2 - N concentration in effluent from continuous operation was as low as (7.5 ± 5.8) μg / L and (6.1 ± 3.6) μg / L, significantly lower than the average (76.9 ± 7.6) μg / L in raw water. PAC PAC-MBR process also found that PAC extended the contact time of microorganisms and organic matter, and provided a carrier for the growth of microorganisms, which can effectively increase the total oxygen consumption rate (SOUR) of the bacteria and make the critical value of the organic concentration in the biological treatment system Reduce, so as to effectively improve the entire biological treatment system of organic matter and ammonia nitrogen removal rate.