中国猪业2025，Vol.20Issue(6)：80-88,9.DOI:10.16174/j.issn.1673-4645.2025.06.009
猪粪水沼气发酵后理化特性变化及农用风险评估
Changes in physicochemical properties and agricultural application risk assessment of pig manure after biogas fermentation
摘要
Abstract
In order to analysis the changes in fertilizer efficiency,heavy metal residues,and sanitary indicators of pig manure before and after biogas fermentation,and to assess its agricultural risks,liquid samples were collected from temporary storage ponds and final sedimentation ponds of three large-scale pig farms in Hunan Province.The changes in heavy metal residues(Cu,Zn,Pb,Cr,Cd,As,Hg),nutrient elements(TN,TP,TK),parasite eggs,faecal coliforms counts,and seed germination index were detected in accordance with relevant industry standards.The single-factor pollution index and Nemerow comprehensive pollution index methods were used to evaluate the agricultural risks of biogas fertilizer.The results showed that the highest residual concentrations of heavy metals in pig ma-nure were Zn and Cu,with maximum levels of 19 793.00 μg/L and 6 521.30 μg/L,respectively,while Hg was undetectable in all sam-ples.After biogas fermentation,the residual concentrations of Zn,Cu,Pb,As,Cr,and Cd significantly decreased.The removal rates were:Zn(81.66％～90.87％),Cu(86.32％～92.86％),Pb(85.26％～91.18％),As(76.07％～83.67％),Cr(89.46％～90.65％)and Cd(81.16％～97.56％).Nutrient elements-total nitrogen(TN),total phosphorus(TP),and total potassium(TK)—showed losses(P＜0.01),with concentrations ranked as TK＞TN＞TP.TK content ranged from 164.00 mg/L to 615.00 mg/L,TN from 29.50 mg/L to 116.50 mg/L,and TP from 1.32 mg/L to 8.78 mg/L.The removal rates of hookworm eggs and roundworm eggs reached 100％,while faecal coliforms removal rates were 95.75％～98.62％.The seed germination index of the fermented manure was 76.05％～77.20％.The single-factor pollution index for Pb,Cr,As,and Cd in the biogas manure range was 0.02～0.33,all indicating clean levels with low agricultural risk.However,for Zn and Cu,the single-factor pollution indices were 0.16～2.32 and 0.14～2.06 respectively,with Nemerow comprehensive pollution indices of 2.52 and 2.21,representing moderate pollution,which posed a potential risk for agricultural irrigation.These results demonstrated that after biogas fermentation,the concentration of heavy metals in pig manure water tends to decrease.However,resid-ual heavy metals(Zn and Cu)still posed potential risks for irrigation purposes.It was recommended that the application rate of biogas manure be controlled appropriately when used for land application.关键词
猪粪水/沼气发酵/重金属残留/无害化/风险评估Key words
pig manure/biogas fermentation/heavy metal residues/sanitization/risk assessment分类
农业科技引用本文复制引用
邱美珍,张星,周桑扬,阳美霞,刘莹莹,刘启红..猪粪水沼气发酵后理化特性变化及农用风险评估[J].中国猪业,2025,20(6):80-88,9.基金项目
湖南省生猪产业技术体系项目(HARS-05) （HARS-05）
湖南省农业科技创新项目(2025CX53) （2025CX53）
