通过优化络合和混凝从受污染水中去除镉。
Removal of cadmium from contaminated by optimized complexation and coagulation.
作者信息
Wang Yi, Wang Chen, Cheng Wei, Bian Yinbing, Guo Peng
机构信息
Hubei Academy of Agricultural Sciences Institute of Agricultural Products Processing and Nuclear Agriculture Technology Research Wuhan 430064 China.
Institute of Applied Mycology Huazhong Agricultural University Wuhan 430070 China.
出版信息
Food Sci Nutr. 2016 May 31;5(2):215-222. doi: 10.1002/fsn3.384. eCollection 2017 Mar.
Heavy metal pollution is a serious problem for ; however, the treatment of contaminated has seldom been studied. This study investigated the removal of cadmium (Cd) from contaminated and its lentinan by complexation and coagulation. Some influencing factors, such as pH, medical dosage, and preoxidation were examined. Cd complexation from contaminated . was shown to be more efficient under acidic conditions (pH 5.0), with a clearance rate of 80.47% in 25 mmol/L EDTA and 78.45% in 25 mmol/L sodium citrate. The Cd content in the lentinan of the contaminated was markedly lower than that in the powdered mushroom (2.77 mg/kg vs. 19.49 mg/kg) and was easier to remove. The maximum Cd clearance rate (96.3%) for lentinan was obtained using an optimized process that involved preoxidation with 0.5 mg/L KMnO, complexing with 25 mmol/L EDTA and 25 mmol/L sodium citrate, and coagulation with 50 mg/L activated carbon (AC) at pH 10.0.
重金属污染对[具体对象]来说是个严重问题；然而，对受污染[具体对象]的处理却鲜有研究。本研究通过络合和混凝法研究了从受污染[具体对象]及其香菇多糖中去除镉（Cd）的情况。考察了一些影响因素，如pH值、药剂用量和预氧化等。结果表明，受污染[具体对象]中的Cd络合在酸性条件（pH 5.0）下更有效，在25 mmol/L乙二胺四乙酸（EDTA）中的清除率为80.47%，在25 mmol/L柠檬酸钠中的清除率为78.45%。受污染[具体对象]的香菇多糖中的Cd含量明显低于香菇粉中的Cd含量（2.77 mg/kg对19.49 mg/kg），且更易于去除。通过优化工艺，即先用0.5 mg/L高锰酸钾预氧化、再与25 mmol/L EDTA和25 mmol/L柠檬酸钠络合、最后在pH 10.0条件下用50 mg/L活性炭（AC）混凝，香菇多糖的最大Cd清除率可达96.3%。
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