globalchange  > 气候变化事实与影响
DOI: 10.1016/j.watres.2019.02.015
Scopus ID: 2-s2.0-85062174686
Research on the variations of organics and heavy metals in municipal sludge with additive acetic acid and modified phosphogypsum
Author: Dai Q.; Ma L.; Ren N.; Ning P.; Guo Z.; Xie L.
Source Publication: Water Research
ISSN: 431354
Publishing Year: 2019
Volume: 155
pages begin: 42
pages end: 55
Language: 英语
Keyword: Degradation ; Heavy metals ; Immobilization ; Municipal sludge ; Risk
English Abstract: Concentration and fraction distribution of organics and heavy metals in municipal sludge treated by modified phosphogypsum and acetic acid (signed as MPG/HAC) were studied. The results showed that MPG/HAC conditioning significantly produce synergistic enhancement effect to dissolution of unstable heavy metals wrapped in the stable colloid network. Simultaneously, after conditioning, about 45.16% of organics such as proteins, polysaccharides and humic acid in supernatant was degraded, thus dissociating large amount of active group which accelerated immobilization of dissolved heavy metals and weaken its toxicity. In addition, MPG with a porous structure could adsorb unstable heavy metals and transform them into residual fraction, leading to a considerable decrease in their mobility risk level. Besides, linear regression models showed that a strong oxidizability of sludge, and destruction of colloidal network could greatly promote dissolution of unstable heavy metals. Simultaneously, sludge oxidizability and organics degradation rate, and disintegration of extracellular polymeric substances (EPS) layer highly accelerate immobilization of unstable metals. Excepting Cd, environmental risk of Cr, Cu, Pb, Zn, Ni and As can be effectively weakened after conditioning. Additionally, MPG/HAC conditioning might be appropriate for stabilization of Cd, Cr and Zn in water supply sludge, especially for Zn. © 2019 Elsevier Ltd
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Document Type: 期刊论文
Appears in Collections:气候变化事实与影响

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Affiliation: Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, Yunnan 650500, China

Recommended Citation:
Dai Q.,Ma L.,Ren N.,et al. Research on the variations of organics and heavy metals in municipal sludge with additive acetic acid and modified phosphogypsum[J]. Water Research,2019-01-01,155
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