Simultaneous nitrogen and phosphorus recovery from sludge-fermentation liquid mixture and application of the fermentation liquid to enhance municipal wastewater biological nutrient removal.
Simultaneous nitrogen and phosphorus recovery from sludge-fermentation liquid mixture and application of the fermentation liquid to enhance municipal wastewater biological nutrient removal.
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DOI：
10.1021/es9005948
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发表时间：
2009-07
影响因子：
11.4
通讯作者：
Chao Zhang;Yinguang Chen
中科院分区：
文献类型：
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作者：
Chao Zhang;Yinguang Chen
近年来，废液活性污泥（WAS）发酵生产短链脂肪酸（SCFAs）备受关注，因为废水处理厂（WWTP）产生的废弃生物固体可重复利用，产生的SCFAs可用于促进生物营养物去除（BNR）。通常，在WAS发酵后，将发酵液分离，然后回收WAS发酵过程中释放的铵和磷，以防止氮和磷对WWTP的负荷增加。作为传统工艺的替代方案，本文研究了在污泥-液分离前鸟粪石形成过程中铵磷的回收，及其对后续污泥-液过滤分离的积极影响。首先，利用响应面法（RSM）对WAS发酵液中铵磷的回收条件进行了优化。然后，研究了铵磷回收对污泥过滤脱水的影响。与未回收铵、磷污泥相比，回收铵、磷污泥的比过滤阻力（SRF）、毛细吸力时间（CST）和过滤后污泥体积分别降低了96.9、99.6%和88.7%。第三，探讨了铵磷回收显著提高污泥脱水能力的机理。鸟粪石的形成、5电位的中和、铵磷回收过程中添加的镁离子的增加、污泥聚合物质的减少等因素导致污泥脱水效果的改善。最后，将发酵液作为BNR的附加碳源，显著提高了营养物的去除效率。
Recently, waste activated sludge (WAS) fermentation for short-chain fatty acids (SCFAs) production has drawn much attention because the waste biosolids produced in wastewater treatment plants (WWTP) can be reused, and the produced SCFAs can be applied to promote biological nutrient removal (BNR). Usually, after WAS fermentation, the fermentation liquid is separated and then the recovery of ammonium and phosphorus, which are released during WAS fermentation, is conducted to prevent the increase of nitrogen and phosphorus loadings to WWTP. As an alternative to the traditional process, this paper investigated the recovery of ammonium and phosphorus in the formation of struvite before sludge-liquid separation, and its positive effecton the following sludge-liquid filtration separation. First, the conditions for ammonium and phosphorus recovery from the WAS fermentation mixture were optimized by response surface methodology (RSM). Then, the effect of ammonium and phosphorus recovery on sludge filtration dewatering was investigated. With ammonium and phosphorus recovery, it was observed that the specific resistance to filtration (SRF), the capillary suction time (CST), and the sludge volume after filtration reduced by 96.9, 99.6, and 88.7%, respectively, compared with no ammonium and phosphorus recovered sludge. Third, the mechanisms for ammonium and phosphorus recovery significantly enhancing sludge dewatering capacity were investigated. The formation of struvite, the neutralization of 5 potential, the increase of magnesium ion, which was added during ammonium and phosphorus recovery, and the decrease of sludge polymeric substance caused the improvement of sludge dewatering. Finally, the fermentation liquid was used as the additional carbon source of BNR, and the nutrient removal efficiency was obviously enhanced.