摘要
针对在处理碱法烟气脱硫所产生的高浓度硫酸盐废水过程中存在的碳源不足问题,探究了以剩余污泥热碱解液作为硫酸盐还原菌混合菌群(SRBs)碳源的可行性。通过SRBs对在不同条件下破解剩余污泥产生的热碱解液的利用效果,确定最利于SRBs利用的剩余污泥热碱解条件为:pH=13,T=70℃,破解时间为10 h;最佳硫酸盐(SO_(4)^(2-))去除反应的工艺参数为:pH=7,T=35℃,ρ(COD)=10000 mg/L,ρ(SO_(4)^(2-))=2500 mg/L。在最佳反应条件下,SO_(4)^(2-)去除率可以达到90%以上,COD利用率达到80%。将SRBs利用污泥热碱解液作为碳源去除SO_(4)^(2-)的效果与4种SRBs常见碳源(乳酸钠、丙酸钠、乙酸钠和葡萄糖)进行对比,实验证明:5种碳源均可被SRBs利用,热碱解液为碳源时SO_(4)^(2-)去除率最高,乳酸钠次之,乙酸钠最低。研究证明剩余污泥热碱解液可以作为SRBs的优质碳源,这可为处理SO_(4)^(2-)废水和污泥资源化处置提供新思路。
This study aimed at the problem of insufficient carbon sources during the treatment of sulfate wastewater and explored the feasibility of using the alkaline-thermal hydrolysate of residual sludge as the carbon source of sulfate-reducing bacteria(SRBs).Batch experimental results showed that the optimum sludge pretreatment conditions were T=70℃,initial pH=13 and t=10 h,and the optimal parameters for SO_(4)^(2-)removal by SRBs wereρ(COD)=10000 mg/L,ρ(SO_(4)^(2-))=2500 mg/L,initial pH=7,and T=35℃.Under this condition,the removal efficiency of SO_(4)^(2-)reached 90%above,and the utilization efficiency ofρ(COD)reached 80%.The SO_(4)^(2-)removal efficiency with sludge alkaline-thermal hydrolase was compared with four other SRBs common carbon sources(sodium lactate,sodium propionate,sodium acetate,and glucose),and the experiment showed that the removal efficiency of SO_(4)^(2-)using sludge hydrolysate as SRBs carbon source was higher than other carbon sources.The research confirmed that the residual sludge alkaline-thermal hydrolysate can be used as the carbon source of SRBs,which provided favorable support for the treatment of SO_(4)^(2-)wastewater and utilization of residual sludge.
作者
崔甜甜
周集体
金若菲
李鑫
CUI Tiantian;ZHOU Jiti;JIN Ruofei;LI Xin(Key Laboratory of Industrial Ecological and Environmental Engineering of Ministry of Education,Dalian University of Technology,Dalian 116024,China)
出处
《环境工程》
CAS
CSCD
2024年第2期23-31,共9页
Environmental Engineering
基金
精细化工和新材料“循环利用石化废弃物减碳工艺技术开发”(2022YF13GX061)。
关键词
污泥热碱解
剩余污泥
硫酸盐还原菌
硫酸盐废水
外加碳源
alkaline-thermal hydrolysate
residual sludge
SRBs
sulfate wastewater
supplementary carbon source
