Effect of organic matter on phosphorus recovery from sewage sludge subjected to microwave hybrid pretreatment.
Effect of organic matter on phosphorus recovery from sewage sludge subjected to microwave hybrid pretreatment.
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DOI：
10.1016/j.jes.2015.10.008
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发表时间：
2016
影响因子：
6.9
通讯作者：
Yawei Wang;Q. Xiao;Hui-zhou Zhong;Xiang Zheng;Yuansong Wei
中科院分区：
文献类型：
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作者：
Yawei Wang;Q. Xiao;Hui-zhou Zhong;Xiang Zheng;Yuansong Wei
微波（MW）复合工艺能够破坏复杂的废弃活性污泥的絮凝结构，并有助于促进以鸟粪石形式回收磷。为了优化鸟粪石产量，本研究（1）比较了微波、微波-酸、微波-碱、微波-H2 O2和微波-H2 O2-碱混合处理的物质释放特性。结果表明，污泥预处理可以实现碳、氮、磷、钙、镁离子的选择性释放。MW-H2 O2是推荐的污泥预处理工艺，用于以鸟粪石形式回收磷。上清液中Mg 2+：NH 4 +-N：PO 43 −-P的比例为1.2：2.9：1。(2)为了明确有机质对鸟粪石回收率的影响，分析了鸟粪石中有机质的组成和分子量分布。低分子量COD有利于氨氮和磷酸盐的去除，滤后的鸟粪石晶体（< 1 kDa）纯度较高。因此，本研究揭示了在污泥鸟粪石结晶过程中考虑高分子量有机物干扰效应的必要性。
Microwave (MW) hybrid processes are able to disrupt the flocculent structure of complex waste activated sludge, and help promote the recovery of phosphorus as struvite. In this study, to optimize struvite yield, (1) the characteristics of matter released in MW-hybrid treatments were compared, including MW, MW-acid, MW-alkali, MW-H2O2, and MW-H2O2-alkali. The results showed that selective release of carbon, nitrogen, phosphorus, Ca2 +, and Mg2 +achieved by sludge pretreatment using MW-hybrid processes. MW-H2O2is the recommended sludge pretreatment process for phosphorus recovery in the form of struvite. The ratio of Mg2 +:NH4+-N:PO43 −-P was 1.2:2.9:1 in the supernatant. (2) To clarify the effects of organic matter on struvite recovery, the composition and molecular weight distribution of organic matters were analyzed. Low molecular weight COD was found to facilitate the removal rate of NH4+-N and PO43-Pviacrystallization, and the amorphous struvite crystals (< 1 kDa) from the filtered solutions had high purity. Therefore, the present study reveals the necessity of taking into consideration the interference effect of high molecular weight organic matters during struvite crystallization from sewage sludge.