Speciation and transformation of heavy metals during vermicomposting of animal manure

Baoyi Lv; Meiyan Xing; Jian Yang

doi:10.1016/j.biortech.2016.03.015

Speciation and transformation of heavy metals during vermicomposting of animal manure

Bioresour Technol. 2016 Jun:209:397-401. doi: 10.1016/j.biortech.2016.03.015. Epub 2016 Mar 5.

Authors

Baoyi Lv¹, Meiyan Xing², Jian Yang³

Affiliations

¹ College of Ocean Science and Engineering, Shanghai Maritime University, Shanghai 201306, China; Institute of Biofilm Technology, Key Laboratory of Yangtze River Water Environment, Ministry of Education, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China.
² Institute of Biofilm Technology, Key Laboratory of Yangtze River Water Environment, Ministry of Education, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China. Electronic address: xingmeiyan@tongji.edu.cn.
³ Institute of Biofilm Technology, Key Laboratory of Yangtze River Water Environment, Ministry of Education, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China.

PMID: 26976060
DOI: 10.1016/j.biortech.2016.03.015

Abstract

This work was conducted to evaluate the effects of vermicomposting on the speciation and mobility of heavy metals (Zn, Pb, Cr, and Cu) in cattle dung (CD) and pig manure (PM) using tessier sequential extraction method. Results showed that the pH, total organic carbon and C/N ratio were reduced, while the electric conductivity and humic acid increased after 90days vermicomposting. Moreover, the addition of earthworm could accelerate organic stabilization in vermicomposting. The total heavy metals in final vermicompost from CD and PM were higher than the initial values and the control without worms. Sequential extraction indicated that vermicomposting decreased the migration and availability of heavy metals, and the earthworm could reduce the mobile fraction, while increase the stable fraction of heavy metals. Furthermore, these results indicated that vermicomposting played a positive role in stabilizing heavy metals in the treatment of animal manure.

Keywords: Animal manure; Heavy metal; Sequential extraction; Stabilization; Vermicomposting.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Animals
Biodegradation, Environmental
Cattle
Electric Conductivity
Humic Substances / analysis
Manure*
Metals, Heavy / analysis
Metals, Heavy / chemistry*
Oligochaeta / metabolism*
Soil Pollutants / analysis
Soil Pollutants / chemistry*
Swine

Substances

Humic Substances
Manure
Metals, Heavy
Soil Pollutants