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秸秆作为硫酸盐还原体系替代C源的可行性及其影响因子
吴开轩,吴昭君,孙庆业
0
(安徽大学资源与环境工程学院,合肥 230601; 安徽省矿山生态修复工程实验室,合肥 230601)
摘要:
为降低硫酸盐还原菌(SRB)处理酸性废水的经济成本,以乳酸钠作对照,分析了3种秸秆浸提液替代乳酸钠作为C源的可行性,同时探究了不同C源、C源定期投加、ρ(COD)/ρ(SO42-)、初始pH和重金属浓度对硫酸盐还原体系的影响。结果表明:3种秸秆浸提液均可作为替代C源,其中大豆秸秆浸提液作C源对硫酸盐还原的效果最好;定期投加C源、提高ρ(COD)/ρ(SO42-)对各C源体系硫酸盐还原有促进作用;降低初始pH、提高重金属浓度对硫酸盐还原有抑制作用;Mn(Ⅱ)浓度升高对各C源体系SO42-去除效果影响不大,在低浓度Cu(Ⅱ)、Fe(Ⅲ)条件下,乳酸钠体系SO42-去除率高于3种秸秆体系,而在较高浓度Cu(Ⅱ)、Fe(Ⅲ)条件下,3种秸秆体系SO42-去除率高于乳酸钠体系。可利用秸秆浸提液作为低成本C源,为处理较高浓度重金属酸性废水提供经济可行的理论参考。
关键词:  碳源  影响因子  硫酸盐还原  重金属  废水治理
DOI:10.13610/j.cnki.1672-352x.20211105.001
基金项目:安徽省农业生态环保与质量安全产业技术体系专项(AHCYJSTX-15)资助。
Feasibility of straw as a substitute carbon source for sulfate reduction system and its influencing factors
WU Kaixuan,WU Zhaojun,SUN Qingye
(School of Resource and Environmental Engineering, Anhui University, Hefei 230601; Anhui Province Mine Ecological Restoration Engineering Laboratory, Hefei 230601)
Abstract:
In order to reduce the economic cost of the acidic wastewater treatment by sulfate-reducing bacteria(SRB), sodium lactate was used as the control carbon source, the feasibility of three straw extracts replacing sodium lactate as carbon source was analyzed, and the effects of different carbon sources, regular addition of carbon source, ρ(COD)/ρ(SO42-), initial pH, and heavy metal concentration on sulfate reduction system were investigated. The results showed that all the three straw extracts could be used as alternative carbon sources to remove SO42-, among which soybean straw extracts had the best removal effect; adding carbon sources regularly and increasing ρ(COD)/ρ(SO42-)had the original promoting effect on sulfate of each carbon source system; reducing the initial pH and increasing the concentration of heavy metals can inhibit the effect of sulfate reduction; The increase of Mn(Ⅱ)content has little effect on sulfate removal, at low concentration of Cu(Ⅱ),Fe(Ⅲ)conditions, The SO42- removal rate of sodium lactate system was higher than that of the three straw systems, and in the relatively high concentration of Cu(Ⅱ),Fe(Ⅲ)conditions, the SO42- removal rate of the three straw systems was higher than that of the sodium lactate system. Straw extract can be used as a low-cost carbon source to provide an economic and feasible theoretical reference for the treatment of acidic wastewater with high concentration of heavy metals.
Key words:  carbon source  impact factor  wastewater treatment  heavy metal  sulfate reduction

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