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浙江大学学报(工学版)
J4  2013, Vol. 47 Issue (9): 1631-1636    DOI: 10.3785/j.issn.1008-973X.2013.09.018
    
Study on migration and stability of total Cr
 in tannery sludge by thermal hydrolysis treatment
FU Cheng-long, MA Hong-lei, CHI Yong, YAN Jian-hua, NI Ming-jiang
State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
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Abstract  

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 migration rate of Cr can reach 56% and 91% at room temperature. The rise of thermal hydrolysis temperature 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 stabilization 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%.

Published: 01 September 2013
CLC:  X 705  
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Cite this article:

FU Cheng-long, MA Hong-lei, CHI Yong, YAN Jian-hua, NI Ming-jiang. Study on migration and stability of total Cr
 in tannery sludge by thermal hydrolysis treatment. J4, 2013, 47(9): 1631-1636.

URL:

http://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2013.09.018     OR     http://www.zjujournals.com/eng/Y2013/V47/I9/1631


热水解处理制革污泥过程中总Cr的转移与稳定性研究

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%.

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