ABSTRACT

In this study, a 30-days laboratory experiment was implemented to investigate the impact of additive biochar on the stabilization of heavy metals in chicken manure compost. Results showed that after the addition of rice straw-derived biochar, heavy metals were more stabilized except Cu, of which the residual fractions distinctly decreased due to the interaction with organic functional groups from biochar. Given the bioavailability of heavy metals, the biochar addition at a 10% proportion decreased the concentration of CaCl2-extractable Cr, Zn, Ni, and Cd. Besides, CaCl2-extractable As did not differ significantly between treatments with and without biochar addition. Furthermore, the CaCl2-extractable Cu was higher than the control, in agreement with the observed changes in speciation. Environment pollution assessment by integrating potential ecological risk assessment explicated the chicken manure compost reached avery high-risk pollution level, and decreased with biochar addition. Therein, Cd was the dominant pollutant with very high potential risk.

摘要

在这项研究中，进行了3​​0天的实验室实验，以研究添加剂生物炭对鸡粪堆肥中重金属稳定化的影响。结果表明，添加稻草源生物炭后，除铜外，重金属更加稳定，其中残留分数由于与生物炭中有机官能团的相互作用而明显减少。考虑到重金属的生物利用度，以10％的比例添加生物炭会降低CaCl2可萃取的Cr，Zn，Ni和Cd的浓度。此外，在添加和不添加生物炭的处理之间，CaCl2的可萃取砷没有显着差异。此外，与观察到的物种变化一致，CaCl2可萃取的Cu高于对照。结合潜在的生态风险评估进行环境污染评估，使鸡粪堆肥达到了平均高风险污染水平，并随着生物炭的添加而降低。其中，Cd是主要污染物，潜在风险很高。