期刊
CHEMICAL ENGINEERING JOURNAL
卷 433, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.134459
关键词
Aerobic digestion; Zero valent iron; Sludge degradation; Nitrogen removal; Dewaterability; Aerobic denitrification
资金
- Australian Research Council (ARC) Future Fellowship [FT160100195]
- Australian Research Council (ARC) [DE220100530]
- Australian Research Council [DE220100530] Funding Source: Australian Research Council
The effects of zero-valent iron (ZVI) on aerobic sludge digestion were studied, and it was found that ZVI greatly enhanced sludge degradation, nitrogen removal, and sludge dewaterability.
Zero-valent iron (ZVI), a low-cost metallic material, has been previously applied in effectively enhancing sewage sludge anaerobic digestion. However, the potential role of ZVI on aerobic digestion of sludge, a completely different sludge treatment method from anaerobic digestion, is still unknown. Herein, the effects of ZVI on the performance of aerobic sludge digestion were systematically studied, focusing on the sludge degradation, nitrogen removal and sludge dewaterability. Results showed ZVI greatly increased the volatile solids (VS) destruction from 27.0 & PLUSMN; 1.3% to 50.0 & PLUSMN; 1.0% and significantly enhanced the TCOD removal from 26.0 & PLUSMN; 1.2% to 47.9 & PLUSMN; 0.9% in aerobic digesters with different ZVI levels (0-20 g/L). The metabolic intermediate transformation steps of solubilization, hydrolysis and catabolism processes in aerobic digestion were all revealed to be enhanced by ZVI. More importantly, the aerobic digesters with higher ZVI levels achieved higher inorganic nitrogen removal, even with higher sludge degradation for ammonium release, due to the occurrence of both chemical and biological denitrification induced by ZVI. Correspondingly, the microbial compositions in the digesters with ZVI shifted towards the direction that was conducive to sludge degradation and nitrogen removal (e.g., aerobic denitrification) compared to control. Further, the dewaterability of the aerobically digested sludge was also improved with ZVI addition, supported by the reducing capillary suction time (CST) and negative surface potential.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据