title: Effect of aeration rate, moisture content and composting period on availability of copper and lead during pig manure composting.
abstract: Pollution by heavy metals, such as copper and lead, has become a limiting factor for the land application of faecal manures, such as pig manure. This study was conducted to investigate the influence of composting process parameters, including aeration rate, moisture content and composting period, on the distribution of heavy metal species during composting, and to select an optimal parameter for copper and lead inactivation. Results showed that the distribution ratios of exchangeable fractions of copper and lead had a bigger decrease under conditions of aeration rate, 0.1 m(3) min(-1) m(-3), an initial moisture content of 65% and composting period of 50 days. Suboptimal composting process conditions could lead to increased availability of heavy metals. Statistical analysis indicated that the aeration rate was the main factor affecting copper and lead inactivation, while the effects of moisture content and composting period were not significant. The rates of reduction of copper-exchangeable fractions and lead-exchangeable fractions were positively correlated with increased pH. The optimal parameters for reducing heavy metal bioavailability during pig manure composting were aeration rate, 0.1 m(3) min(-1) m(-3), initial moisture content, 65%, and composting period, 20 days.
authors.affiliation: Chinese Academy of Agricultural Engineering, Beijing, China China Key Laboratory of Energy Resource Utilization From Agriculture Residue, Ministry of Agriculture, Beijing, China.
authors.forename: Yujun
authors.initials: Y
authors.lastname: Shen
authors.affiliation: Chinese Academy of Agricultural Engineering, Beijing, China China Key Laboratory of Energy Resource Utilization From Agriculture Residue, Ministry of Agriculture, Beijing, China.
authors.forename: Lixin
authors.initials: L
authors.lastname: Zhao
authors.affiliation: Chinese Academy of Agricultural Engineering, Beijing, China China Key Laboratory of Energy Resource Utilization From Agriculture Residue, Ministry of Agriculture, Beijing, China newmhb7209@163.com.
authors.forename: Haibo
authors.initials: H
authors.lastname: Meng
authors.affiliation: Chinese Academy of Agricultural Engineering, Beijing, China China Key Laboratory of Energy Resource Utilization From Agriculture Residue, Ministry of Agriculture, Beijing, China.
authors.forename: Yueqing
authors.initials: Y
authors.lastname: Hou
authors.affiliation: Chinese Academy of Agricultural Engineering, Beijing, China China Key Laboratory of Energy Resource Utilization From Agriculture Residue, Ministry of Agriculture, Beijing, China.
authors.forename: Haibin
authors.initials: H
authors.lastname: Zhou
authors.affiliation: Rural Energy & Environment Agency, Ministry of Agriculture, Beijing, China.
authors.forename: Fei
authors.initials: F
authors.lastname: Wang
authors.affiliation: Chinese Academy of Agricultural Engineering, Beijing, China China Key Laboratory of Energy Resource Utilization From Agriculture Residue, Ministry of Agriculture, Beijing, China.
authors.forename: Hongsheng
authors.initials: H
authors.lastname: Cheng
authors.affiliation: China Key Laboratory of Non-point Source Pollution Control, Ministry of Agriculture, Beijing, China.
authors.forename: Hongbin
authors.initials: H
authors.lastname: Liu
mesh_terms: D000388:Air; D000818:Animals; D003300:Copper / Q000032:analysis* / Q000493:pharmacokinetics; D005308:Fertilizers; D006863:Hydrogen-Ion Concentration; D007854:Lead / Q000032:analysis* / Q000493:pharmacokinetics; D008372:Manure / Q000032:analysis; D017744:Medical Waste Disposal / Q000295:instrumentation / Q000379:methods*; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants / Q000032:analysis / Q000493:pharmacokinetics; D034421:Sus scrofa; D013696:Temperature
chemical_list: D005308:Fertilizers; D008372:Manure; D017744:Medical Waste Disposal; D012987:Soil; D012989:Soil Pollutants; D007854:Lead; D003300:Copper
keywords: Composting; aeration rate; composting period; copper; heavy metal; lead; moisture content