|HU Xiu-ren, YANG Dong-hai, BIAN Bo.Distribution Characteristics and It’s Influence of Heavy Metals in Raw and Anaerobically Digested Pig Slurry[J].Environmental Monitoring and Forewarning,2019,11(4):48-53
|关键词: 猪饲料 养猪粪污 厌氧消化 重金属 形态变化 太湖流域
|Distribution Characteristics and It’s Influence of Heavy Metals in Raw and Anaerobically Digested Pig Slurry
HU Xiu-ren, YANG Dong-hai, BIAN Bo
1.School of Environment, Nanjing Normal University, Nanjing,Jiangsu 210023, China，2.School of Environment, Tong Jing University, Shanghai, 200092, China
|To study the morphological changes of heavy metals in anaerobic digestion process and its influencing factors, centralized anaerobic digestion treatment was carried out on the manure collected from a typical pig farming area in the Taihu Lake Basin, and the total and morphological characteristics of heavy metals in pig feed, pig manure and biogas fertilizer were analyzed. The results showed that the content of heavy metals in pig feed was different in different breeding stages. The contents of Cu, Zn and Cd in piglet feed and pig manure were higher, while Cr and Ni were the highest in feed and pig manure in the late stage of growth and fattening pig. In pig manure, Cu is mainly in organically bound state, Zn is mainly in Fe Mn oxide bound state, Pb and Cr are mainly in residual state, and Ni is mainly in Fe Mn oxide bound state and carbonate bound state. The average values of Cu and Zn in biogas slurry were 1.59 and 1.40 times of that in pig manure, and the average values of Cu and Zn in biogas residue were 1.58 and 1.37 times of that in pig manure in regulating pond. The concentration of heavy metals in biogas slurry appeared a relative concentration effect. pH, DOC and organic matter were the main factors affecting the change of heavy metals in anaerobic digestion process.
|Key words: Pig feed Pig slurry Anaerobically digestion Heavy metals Morphological change Taihu Lake Basin