摘要
将经过Fenton氧化预处理后的污泥进行资源化利用前需进一步降低其重金属含量,采用人工湿地进一步处理Fenton氧化污泥,考察了其在人工湿地处理过程中重金属的去除及迁移转化情况.结果表明,Fenton氧化污泥经人工湿地处理后,Cu、Zn和Ni的去除率分别达到78.3%、63.3%和25.4%,而Mn的去除效果较差.人工湿地处理降低了Fenton氧化污泥中Cu、Mn、Zn和Ni的生物有效态含量.人工湿地基质中各重金属含量随基质深度增加而增加,Cu、Mn、Zn和Ni在基质中的含量分别为18.00 mg/kg、382.75 mg/kg、127.25mg/kg和121.75mg/kg.Fenton氧化污泥湿地系统中植物根系和茎叶组织对重金属富集贡献率分别为0.23%和0.43%.Fenton氧化污泥抑制了黄花菖蒲根系生长,其根系和茎叶的干重较对照分别减少了77.8%和83.2%.
Fenton oxidation treatment can improve the dewatering performance of sludge,but the total amount of heavy metals was not changed and the content of biological effective form increased in the sludge.So,further treatment must be taken for sludge resource.Constructed wetlands were used to treat the Fenton oxidation sludge,and the removal rate and transformation of heavy metal were studied.The results showed that the removal rates of Cu,Zn and Ni were 78.3%,63.3%and 25.4%,respectively,but Mn was less removed.The biological availability of Cu,Mn,Zn and Ni in the Fenton oxidation sludge was reduced after the constructed wetland treatment.The heavy metals concentration in the substrate of Fenton sludge treated constructed wetland increased with substrate depth.The average concentrations of Cu,Mn,Zn and Ni in the substrate were 18.00 mg/kg,382.75 mg/kg,127.25 mg/kg and 121.75 mg/kg.The contribution rate of plant to heavy metal enrichment was 0.23% ~0.43% in Fenton oxidation sludge treatment system.It＇s remarkable that Fenton oxidation sludge inhibited plant growth,and the dry weight of the plant roots and stems decreased by 77.8% and 83.2% respectively.The results provide support for the treatment of heavy metals in sewage sludge pretreated by Fenton oxidation.
作者
姚巧凤
徐大勇
陈伟华
操沛沛
程维明
洪亚军
YAO Qiaofeng;XU Dayong;CHEN Weihua;CAO Peipei;CHENG Weiming;HONG Yajun(College of Biological and Chemical Engineering,Anhui Polytechnic University, Wuhu 241000, China;School of Chemistry and Chemical Engineering,Shangrao Normal University,Shangrao 334000 China;Chery Automobile Co., Ltd., Wuhu, 241009, China)
出处
《安徽工程大学学报》
CAS
2018年第2期1-7,共7页
Journal of Anhui Polytechnic University
基金
国家自然科学基金资助项目(51408001)
