NDLI: Extraction of Heavy Metals from Sewage Sludge with Phosphoric Acid

Content Provider	IEEE Xplore Digital Library
Author	Hua Zhang ZhiLiang Zhu YanLing Qiu RongHua Zhang JianFu Zhao
Copyright Year	2010
Abstract	On basis of chemical extraction technology, H3PO4 has been used to remove heavy metals from the industrial sewage sludge. At the laboratory scale, heavy metals Zn, Pb, Cd, Ni, Cr and Cu were extracted synchronously from the sewage sludge. The results showed that H3PO4 concentrations had a significant effect on the extraction efficiency of heavy metals. The extraction efficiency increased gradually with H3PO4 concentrations increasing, and 5% H3PO4 was the optimal condition with the extraction efficiency of six heavy metals for Zn 79.71%, Pb 99.1%, Cd 87.15%, Ni 70.57%, Cr 78.01%, and Cu 60.91%, respectively. The species distribution of heavy metals in sewage sludge played an important influence on the extraction of heavy metals. From the analysis of species distribution of heavy metals before and after extraction, it was found that the extraction of heavy metals except for Pb came mainly from four fractions that were, exchangeable, bounding to carbonates, bounding to iron and manganese oxides, and bounding to organic matter. However, the residual fraction of Pb can almost be extracted completely. It was presumed that the extraction of heavy metals was mainly controlled by three aspects: the effect of H3O+, the coordination reaction, and the precipitation reaction. On the synergistic effect of H3O+, the coordination reaction predominated in the process of extraction compared with the precipitation reaction.
Starting Page	1
Ending Page	5
File Size	277728
Page Count	5
File Format	PDF
ISBN	9781424447121
ISSN	21517622
DOI	10.1109/ICBBE.2010.5517230
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-06-18
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Chemical industry Biodegradable materials Chemical engineering Pollution control Soil Chromium Educational institutions Copper Zinc Chemical technology
Content Type	Text
Resource Type	Article

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