厨余发酵液作为中试A/O-MBR外增碳源的脱氮特性

利用厨余发酵液作为A/O-MBR的外增碳源,考察在不同发酵液投加量和水力停留时间(HRT)条件下的脱氮性能以及膜污染特点.结果表明,发酵液的反硝化速率和COD利用率与乙酸钠接近,比葡萄糖高.通过A/O-MBR的运行发现,厨余发酵液作为碳源能够增强微生物活性,强化反硝化过程,从而提高脱氮效率.TN的去除效率随着发酵液投加量的增加而增大.发酵液投加前后,反应器内的EPS并没有积累,膜污染速率变化较小.化学清洗可以有效地去除膜污染物质,恢复膜通量.同时,延长HRT有助于提高脱氮效率和缓解膜污染.

Characteristics of nitrogen removal in a pilot-scale A/O-MBR with Fermentation Liquid of Food Waste (FLFW) as external carbon sources

Fermentation liquid of food waste (FLFW) was applied as external carbon to a pilot-scale A/O-MBR to explore the characteristics of nitrogen removal and membrane fouling under different dosage and HRT. Results demonstrated that FLFW and sodium acetate characterized similar specific denitrification rate (SDNR) and COD utilization efficiency, but both of them are higher than that of glucose. It was also found that the FLFW can stimulate the activity of biomass and enhance denitrification processes significantly, which further improved nitrogen removal. The TN removal efficiencies increased with the addition of FLFW. In addition, after adding FLFW, the EPS did not accumulate in reactor and the membrane fouling rate (FR) increased slightly. Chemical clean can effectively remove membrane foulants and recover the permeability. Lengthening the HRT was more advantageous in nitrogen removal and membrane fouling control.