【作者】 苏晴； 吴丹； 刘嘉烈； 包兵； 徐福银； 丁文川；

【Author】 Su Qing;Wu Dan;Liu Jialie;Bao Bing;Xu Fuyin;Ding Wenchuan;Chongqing Environmental Engineering Evaluation Center;Chongqing Agricultural Resources and Environmental Protection;Chongqing Landscape Architectural Science Institute;School of Construction and Environmental Engineering,Chongqing University;

【机构】 重庆市环境工程评估中心； 重庆市农业生态与资源保护站； 重庆市风景园林科学研究院； 重庆大学城市建设与环境工程学院；

【摘要】 将污泥和餐厨垃圾经热解、堆肥以及干化处理制备的有机改良剂加入Cd污染土壤进行原位修复,结果表明,在施加量50 g/kg下,修复60 d和330 d后,热解和堆肥产物可使土壤中Cd的稳定态比例较对照提高18.3~35.6百分点和14.7~27.6百分点,而干化产物在60 d时土壤Cd的稳定态较对照提高了11.5~14.8百分点,但330 d后其稳定态比例接近甚至低于对照。施加不同有机改良剂使土壤p H、CEC和有机质发生变化。相关性分析表明,土壤p H与土壤Cd的各形态之间存在显著相关关系。原料来源和处理方式影响有机改良剂对土壤Cd固定效果,其中采用污泥和餐厨垃圾热解处理制备生物炭改良剂是一种较好地选择。更多还原

【Abstract】 In this paper,incubation experiments were conducted to investigate the effects of organic amendments,which were produced from sewage sludge and food waste through pyrolysis,composting and drying processes,on stabilization of Cadmium( Cd) contaminated soil. The results showed that the pyrolytic and compost product additions increased stable Cd in soil( by18. 3% ~ 35. 6% for 60 d incubation period and 14. 7% ~ 27. 6% for 330 d incubation period) in comparison with control under the application amount of 50 g/kg. The drying product additions could increase stable Cd in soil by 11. 5% ~ 14. 8% in comparison with control during 60 d incubation,however,the stable Cd in amendments addition sample was even lower than that of control after 330 d incubation. The p H value,Cation exchange capacity( CEC) and Organic matter content of soil were varied after application of all amendments. The correlation analysis revealed the obvious correlationship between soil p H and Cd fractions. The results suggest that different processing techniques resulted in distinguishing properties of organic amendments from same matrix and thus impact their performances of Cd stabilization in soil. As far as environmental effects and risks to be concerned,biochars derived from sewage sludge and food waste could be promising organic amendments for Cd contaminated soil remediation.更多还原