制革污泥生物沥浸液中铬回收的方法与效果研究  

Recovery of chromium from tannery sludge bioleachate

作　　者：廖岳华[1] 周立祥[1] 刘秀海[1] 宋兴伟[1] 

机构地区：[1]南京农业大学资源与环境学院,南京210095

出　　处：《环境工程学报》2007年第10期104-107,共4页Chinese Journal of Environmental Engineering

基　　金：教育部新世纪优秀人才支持计划(NCET-04-0505)

摘　　要：对制革污泥生物沥浸液加碱沉淀回收Cr时碱的类型与用量、加碱后混合液的沉降速度、沉降比以及上层清液悬浮性固体(SS)及Cr含量与pH关系等进行了研究。结果表明,氧化镁和氧化钙均能很好地沉淀制革污泥经生物沥浸处理后所得的铬液,而液碱效果较差。综合沉淀效果和经济成本考虑,氧化钙作沉淀剂更为合适。将含Cr 720 mg/L的铬液调至pH 7.0,消耗氧化钙的质量浓度为10.0 g CaO/L铬液,能使Cr从液相完全去除,混合液的沉降比达40%。Chromium（ Ⅲ） in tannery sludge bioleachate can be precipitated through addition of different alkaline. The effects of addition of CaO, MgO and liquid caustic soda （NaOH） on the Cr recovery （ including the dosage of added alkaline, the precipitation speed and ratio of the bioleachate after addition of different alka- line, and the content of suspended substances （SS） and Cr in the upper solution） were studied. The results indicated that the addition of CaO or MgO resulted in a higher Cr recovery than liquid caustic soda. Taking precipitation efficiency and economical cost into account, addition of CaO is more suitable than MgO in the chromium （ Ⅲ） recovery process. The dosage of 10.0 g/L for CaO added in chromium（ Ⅲ ） containing bioleachate could adjust pH 1.6 in the initial bioleachate to pH 7 and Cr（Ⅲ） concentration of 720 mg/L in the initial bioleachate to 0 mg/L with almost 100% of Cr（Ⅲ ） recovery.

关 键 词：制革污泥 生物沥浸液 铬 回收 

分 类 号：X794[环境科学与工程—环境工程]