复合稳定剂对污泥中重金属的稳定化效能研究  

Effect of Composite Stabilizer on the Stability of Heavy Metal Containing Sludge

作　　者：张慧[1] 李金河 赵立伟 王晖 ZHANG Hui;LI Jinhe;ZHAO Liwei;WANG Hui(Tianjin Capital Environmental Protection Group Co.Ltd.,Tianjin 300381,China)

机构地区：[1]天津创业环保集团股份有限公司,天津300381

出　　处：《天津建设科技》2024年第4期56-61,共6页Tianjin Construction Science and Technology

摘　　要：重金属赋存是制约污泥资源化利用的重要因素。选取碳酸钙(CaCO3)、羟基磷灰石(HAP)和海泡石(Sepiolite)3种稳定剂,以污泥干重的2%、5%、10%投加到供试污泥中,21 d后,采用四分法取样分析浸出毒性及重金属形态,结果表明:3种稳定剂对Cd的稳定作用较弱;另外,HAP的投入量与As的稳定效果成反比。将3种稳定剂按比例复配后,以同样方法研究各组配比对污泥重金属稳定效果,结果表明:HAP∶sepiolite∶CaCO3(质量比)为1∶1∶1时效果最好;此时,污泥中Cd的稳定率达到了80%以上,As、Cr、Pb及Cu的浸出稳定率接近100%,只有Zn和Ni的稳定率与单一稳定剂时相比无明显变化;Cd、Cr、Pb及Cu的稳定态较之前单一稳定剂作用无明显变化甚至减少,但复合稳定剂可提高残渣态的比例;As、Zn和Ni的形态则未有明显变化;复合稳定剂间的协同作用,促使Cd、Cr、Pb及Cu的形态向更稳定态转化。The occurrence of heavy metals is an important factor restricting the utilization of sludge resources.The three stabilizers,calcium carbonate(CaCO3),hydroxyapatite(HAP),and sepiolite were selected and added to the tested sludge.The addition ratios were 2%,5%and 10%of the dry sludge weight.After 21 days,the leaching toxicity and heavy metal morphology were researched via the quartering method.The results indicate that the three stabilizers have weaker stabilizing effects on Cd.In addition,the total amount of HAP is inverse⁃ly proportional to the stability effect of As.Therefore,after compounding the three stabilizers in proportion,the effects of each group′s ratio on stabilization of heavy metals in sludge was explored using the same method.The results indicated that the best result achieved when the mass ratio of HAP to sepiolite to CaCO3 was 1∶1∶1.At this ratio,the stabilization rate of Cd in the sludge reached over 80%,and the leaching stabilization effi⁃ciencies of As,Cr,Pb and Cu were close to 100%.Only the stabilization efficiency of Zn and Ni showed no significant change compared to a single stabilizer.The stable states of Cd,Cr,Pb and Cu showed no signifi⁃cant change or even decrease compared to the previous single stabilizer.But the composite stabilizer can in⁃crease the proportion of residual states,the morphology of As,Zn and Ni did not show significant changes.The synergistic effect between composite stabilizers promotes the transformation of Cd,Cr,Pb and Cu forms to more stable states.

关 键 词：污泥 重金属 复合稳定剂 浸出稳定率 形态分析 

分 类 号：X703[环境科学与工程—环境工程]