Dong Qirong, Parker Wayne, Dagnew Martha
Department of Civil and Environmental Engineering, University of Waterloo, 200 University Ave. West, Waterloo, Ontario N2L 3G1, Canada E-mail:
GE Water & Process Technologies, 3239 Dundas Street West, Oakville, Ontario L6M 4B2, Canada.
Water Sci Technol. 2018 May;2017(2):481-491. doi: 10.2166/wst.2018.175.
A transient study was conducted at pilot scale to assess the impact of Fe dosage on the dynamics of biological and membrane performance of an anaerobic membrane bioreactor (AnMBR) treating authentic municipal wastewater. A transient model of the AnMBR system was employed to assist with interpretation of the observed responses in the mixed liquor under different FeCl dosages. A high dosage (43 mg FeCl/L) resulted in a significant accumulation of fixed suspended solids and volatile suspended solids (VSS) and reduction of colloidal COD in the mixed liquor. The elevated dosages appeared to reduce the biodegradability of VSS that was present in the raw wastewater. Intermediate dosages of FeCl (21-12 mg/L) had less effect on these responses and did not appear to affect VSS biodegradation. Membrane performance was significantly affected by FeCl dosage as indicated by reversible resistance (RR) and physically irreversible resistance (IR). RR was closely related to the colloidal COD in the mixed liquor, thus responded quickly to Fe dosage. Physically, IR had a delayed response to changes in the colloidal COD concentrations in the mixed liquor and this was attributed to the effect of slow mass transfer of colloidal matter between the mixed liquor and the membrane.
进行了一项中试规模的瞬态研究，以评估铁剂量对处理实际城市污水的厌氧膜生物反应器（AnMBR）生物和膜性能动态的影响。采用AnMBR系统的瞬态模型来辅助解释不同FeCl剂量下混合液中观察到的响应。高剂量（43 mg FeCl/L）导致混合液中固定悬浮固体和挥发性悬浮固体（VSS）显著积累，胶体化学需氧量（COD）降低。较高剂量似乎降低了原废水中存在的VSS的生物降解性。中等剂量的FeCl（21 - 12 mg/L）对这些响应的影响较小，似乎也不影响VSS的生物降解。如可逆阻力（RR）和物理不可逆阻力（IR）所示，膜性能受FeCl剂量的显著影响。RR与混合液中的胶体COD密切相关，因此对铁剂量反应迅速。从物理角度来看，IR对混合液中胶体COD浓度变化的响应具有延迟性，这归因于胶体物质在混合液和膜之间缓慢传质的影响。
