钢渣用作砷污染地下水修复PRB介质的研究  

RESEARCH ON STEEL SLAG USED FOR REMEDIATION OF ARSENIC CONTAMINATED GROUNDWATER AS THE PRB FILLING

作　　者：江愍格[1] 廖国权[1,2] 李华[1,3] 程芳琴[3,4] 史永林[5] 

机构地区：[1]山西大学环境与资源学院,山西太原030006 [2]天津华能杨柳青热电有限责任公司,天津300380 [3]国家环境保护煤炭废弃物资源化高效利用技术重点实验室,山西太原030006 [4]山西大学资源与环境工程研究所,山西太原030006 [5]山西太钢不锈钢股份有限公司技术中心,山西太原030003

出　　处：《水处理技术》2012年第10期94-98,共5页Technology of Water Treatment

基　　金：山西省科技攻关(20090311072);山西省重大专项(20111101016);国际科技合作项目(S2011ZR0281);国家自然科学基金项目(20906053)

摘　　要：在分析钢渣的资源利用特性与污染风险的基础上,模拟研究钢渣作为可渗透反应墙(PRB)介质对砷污染地下水的去除性能,分析初始砷浓度、原水流速等对除砷性能的影响,并对钢渣用作砷污染地下水原位修复的PRB材料的可行性进行探索。结果表明,钢渣的主要元素为Ca、Fe、Si、Mg、Al,主要矿物质为Ca2SiO4和Ca3Mg(SiO4)2,利用钢渣碱度高,机械强度大,呈多孔结构,可作为良好的过滤性能和吸附材料;钢渣浸出液的pH、重金属与氟含量均低于我国危险废物浸出毒性鉴别标准,环境污染风险很小;在流量相同的情况下,钢渣PRB对砷的去除率在初始砷质量浓度0.1 mg/L时达到最大,流量为0.5 mL/min时,初始砷质量浓度对去除效果影响不明显,去除率均在96%以上;在初始砷质量浓度相同的情况下,钢渣PRB对砷的去除率随流量的增大而降低;整体上钢渣PRB对砷的去除率随处理水样量增加呈下降趋势,但处理水样量为3 L时,去除率最低仍可达90%以上。钢渣作为PRB材料处理高砷地下水成本低、稳定可靠、去除效率高,是一种具有广阔开发应用前景的PRB材料。Based on analyzing the utilization characteristics and the contamination risk of steel slag, the remediation of arsenic contaminated groundwater with steel slag ofPRB was simulated, andtheinfluenceofinitialarsenicconcentration, rawwaterflowratetotheperformanceofarsenicremovalwere studied, to explore the feasibility that the steel slag was used for remediation of the arsenic contaminated groundwater as the PRB filling. The results showed that the main elements of steel slag are Ca, Fe, Si, Mg, and AI, the main minerals as Ca2SiO4 and Ca3Mg（SiO4）2, because of the steel slag basicity and high mechanical strength also the porous structure, it can be used as a good filter performance and the adsorption material; The pH, heavy metals and fluorine content of the steel slag leaching solution were lower than China＇s hazardous waste leaching toxic identification standard, the risk of environmental pollution was relative small; In the same flow rate, arsenic removal of steel slag PRB in the initial arsenic 0.1 mg/L concentration was the biggest, when the flow rate was 0.5 mL/min, the influence of the initial concentration of arsenic removal rate was not obviously, the removal rate were above 96%; In the same initial concentration of arsenic, the arsenic removal of steel slag PRB decreased with increasing flow rate; Overall the steel slag PRB to the removal rate of arsenic with processing of increasing water drop, but processing water quantity to be 3 L, the lowest removal still can reach above 90%. Steel slag as PRB materials to handle high-arsenic groundwater was low cost, stable, reliable and high removal efficiency, and it was a broad prospect for the development and application of PRB materials.

关 键 词：钢渣 砷 9PRB 

分 类 号：X703.1[环境科学与工程—环境工程]