一体式MBR处理洗浴污水的长期运行效果

Long-term Operation Performance of Full-scale Submerged Membrane Bioreactor for Bath Wastewater Treatment

建立了规模为240 m^3/d的一体式膜-生物反应器（SMBR）处理洗浴污水的示范工程,并进行了约450 d的跟踪监测。结果表明,当系统容积负荷为1.04～2.80 kgCOD/（m^3·d）时,SMBR的出水水质稳定,且达到《城市杂用水水质标准》（GB/T 18920-2002）的要求.出水COD＜35 mg/L、NH3-N＜2.0 mg/L、LAS＜0.3 mg/L,生物作用对上述3指标的去除率分别为46.9%～93.5%、68.1%～99.4%和94.5%～99.4%.膜的高效截留作用弥补了生物处理的不稳定性,强化了系统对COD的去除效果,但对NH3-N和LAS的进一步去除作用较小，膜表面的滤饼层和凝胶层是造成膜污染的主要因素,定期进行在线化学清洗可以有效恢复膜的过滤性能.

The long-term stability of reclaiming bath wastewater was investigated with a 240 m^3/d full-scale Submerged Membrane Bioreactor （SMBR）at volume load of 1.04 -2.80 kgCOD/（ m^3 · d）. The operation was continued for over 450 days. The quality of the effluent meets the wastewater reclamation standard of China： COD 〈 35 mg/L, NH3 - N 〈 2.0 mg/L, and LAS 〈 0.3 mg/L. Most pollutants in the influent are removed by the biological treatment, with 46.9% - 93.5 % of COD, 68.1% - 99.4% of NH3 -N and 94.5% -99.4% of LAS. Membrane separation offsets the unstable biological treatment of COD, but has a less effective NH3 - N and LAS removal. The main reason for membrane fouling is a sludge adhesion and a gel layer formation over the membrane surface. Periodical chemical cleaning is ef- fective for restoring the membrane filterability.