摘要
电镀废水中通常含有大量的重金属元素,具有极强的危害性,电镀行业被认为是全球三大污染行业之一。实验室制备新型羧甲基纤维素钠桥联FeS材料并用其处理浙江省东阳市某电镀厂产生的高浓度含镍浓水,包括镍原水,镍初级处理水以及终处理水。主要流程为化学氧化破络、初次沉淀和羧甲基纤维素钠桥联FeS或Na_2S·9H_2O二次沉淀处理。通过对废水中镍以及铬、铜、铅、锌5种重金属去除效果的研究发现,当pH为9.5,羧甲基纤维素钠桥联FeS或Na_2S·9H_2O投加量为200 mg/L时,3种废水的总镍浓度均稳定低于0.1 mg/L,其他重金属的浓度也均达标,符合GB 21900-2008中对于铬、铜、镍、铅、锌的要求。比较2种材料的制备成本发现,处理1 t电镀废水Na_2S·9H_2O成本为0.81元,而羧甲基纤维素钠桥联FeS为0.63元,综合考虑各种因素,羧甲基纤维素钠桥联FeS相比较于Na_2S·9H_2O为一种更为经济适用、高效且环境影响小的材料,可大规模投入使用。
Electroplating is one of the most serious three polluting industries in the world due to the contamination of high concentrations of heavy metals. In this study, we investigated the effectiveness of a new class of carboxymethyl cellulose （CMC） bridged iron sulfide （CMC bridged FeS） for the removal of nickel in the electroplating raw water, primary treatment water, and ultimate treatment water. The treatment process consisted of chemical decomplexation with NaC10, first precipitation using NaOH, and secondary precipitation with the addition of Na2S ·9H2O or CMC bridged FeS. We found that when the dosage of Na2S ·9H20/CMC bridged FeS was 200 mg/L at pH 9.5, the total nickel concentration reached lower than 0.1 mg/L, meeting the environmental standards （GB 21900-2008）. Same results were also observed for other heavy metals, namely, Cr, Cu, Pb, Zn. The reagent cost of treating 1 t ofeleetroplating wastewater was 0.81 RMB for Na2S· 9H2O and 0.63 RMB for CMC bridged FeS, thus, the CMC bridged FeS was a more economic and effective sorbent, and it had lower environmental influence, which could be put into use in large scale.
出处
《水处理技术》
CAS
CSCD
北大核心
2017年第1期27-30,共4页
Technology of Water Treatment
基金
国家自然科学基金面上项目(31270544
41473070)
国家高技术研究发展计划(863)重大项目(2013AA06A205)
中欧环境可持续项目(DCI-ASIE/2013/323-550)
关键词
电镀废水
硫化亚铁
重金属
镍
electroplating wastewater
iron sulfide
heavy metals
nickel
