《Table 2 The concentration of heavy metals in different fermented raw materials》

  提示：宽带有限、当前游客访问压缩模式

本系列图表出处文件名：随高清版一同展现

《Application Status and Prospects of Biogas Fertilizer in Modern Agricultural Production》

1. 获取 高清版本忘记账户？点击这里登录

1. 下载图表忘记账户？点击这里登录

（mg/L）

Biogas fertilizer is a kind of quick-acting bio-organic compound fertilizer with strong nutrient ability，high nutrient utilization rate，bacteriostasis and enhancement of resistance.However，heavy metals of biogas fertilizer must be detected before application，and the excess biogas fertilizer should be treated harmlessly to ensure the safe return of biogas fertilizer to field.Li Jian et al.found that the content of As，Cr and Cd in the biogas residues of the mixed feeding method was found to be far higher than the pollutant indexes of NY/T 5018-2001，and the content of Hg was close to the limit value of the standard，but the content of heavy metals in the biogas residues of green feeding method was not beyond the limit value of the standard except Pb.The measurement standards of heavy metals in biogas liquid were vague.The heavy metals content in biogas liquid did not exceed the standard of organic fertilizer，but far exceeded the standard of irrigation water quality.Liu Sichen et al.[40]found that the content of heavy metals in the biogas liquid produced by different fermentation materials was significantly different，and the content of heavy metals in the biogas liquid from pig farms was higher than that from cattle farms（Table 2）.Ma Jieqiong et al.[41]found that the content of heavy metals in biogas liquid exceeded the national standard for comprehensive discharge of sewage and the standard for irrigation water quality.The main source of these pollutants was feed additive，and the suspended solids could be removed from biogas liquid by centrifugation，thus reducing the content of heavy metals in biogas liquid.Shi Yancai[42]found that the earthworm or earthworm with bacterial fertilizer could effectively reduce the ecological hazard of heavy metals.Chen Miao et al.[43]put forward that before applying biogas fertilizer，it is necessary to carry out harmless treatment and reduce the content of heavy metals in biogas fertilizer，and the concrete methods can refer to the remediation methods of heavy metals in soil，such as super-enriched plants，leachate，and fixative.