热水解处理制革污泥过程中总Cr的转移与稳定性研究  

Study on migration and stability of total Cr in tannery sludge by thermal hydrolysis treatment

作　　者：符成龙[1] 麻红磊[1] 池涌[1] 严建华[1] 倪明江[1] 

机构地区：[1]浙江大学能源清洁利用国家重点实验室,浙江杭州310027

出　　处：《浙江大学学报（工学版）》2013年第9期1631-1636,共6页Journal of Zhejiang University：Engineering Science

基　　金：水体污染控制与治理科技重大专项资助项目(2009ZX07317-003);国家"973"重点基础研究发展规划资助项目(2011CB201506)

摘　　要：采用热水解法研究了不同热水解温度和酸性条件下,制革污泥中重金属总铬的转移特性及浸出毒性变化.结果表明:pH对制革污泥中Cr的溶出起主要作用,H2SO4调节pH为2.5和1.5时,常温水解预处理对污泥中Cr的转移率分别达到了56%和91%.热水解温度的提高不利于Cr向液相转移,当pH=2.5时,180℃热水解后的水解液中Cr的质量分数比常温条件下降低了70%以上.热水解处理促进污泥中Cr的稳定,且随着热水解温度的升高,Cr的浸出毒性显著降低,180℃热水解Cr的稳定化率达93.2%,而常温下只有50.8%,因此,可采用常温H2SO4浸取+热水解联合处理的方法,实验结果表明:Cr的转移和稳定化效果均较好,污泥中Cr向液相的转移率高于90%,固相中Cr的浸出毒性显著降低,稳定化率超过95%.The migration characteristics and leaching toxicity of total Cr in tannery sludge were studied at different thermal hydrolysis temperatures and acid conditions. The results show that pH plays a leading role in migration of Cr from solid phase to liquid phase. At pH=2.5 and 1.5 adjusted by H2SO4, the mi- gration rate of Cr can reach 56% and 91% at room temperature. The rise of thermal hydrolysis tempera- ture will worsen the migration of Cr to hydrolysate. At pH of 2.5, the concentration of Cr in hydrolysate is reduced over 70% at 180 ~C compared to room temperature. Thermal hydrolysis promotes the stability of Cr, and the leaching toxicity of Cr is significantly reduced as temperature rises. At 180 ~C, the stabiliza- tion rate of Cr increases to 93.2%, while at room temperature it is only 50.8%. By H2SO4 extraction at room temperature and subsequently thermal hydrolysis, this combined method obtains good results of the migration and stability of Cr. more than 90% of Cr is dissolved into liquid phase, the leaching toxicity of Cr is lowered evidently and the stabilization rate is more than 95 %.

关 键 词：制革污泥 硫酸 热水解 重金属 铬 

分 类 号：X705[环境科学与工程—环境工程]