EXPERIMENTAL STUDY OF ZINC CONTAMINATED SLUDGE SOLIDIFICATION WITH CEMENT AND SLAG
LIANG Shihua;NIU Jiuge;WANG Meng;LIU Yongjian;YIN Yingmei;School of Civil and Transportation Engineering,Guangdong University of Technology;Ministry of Transport and the South China Sea Flying the First Rescue Team;
Zinc is a common heavy metal pollutant. The environment will be damaged by the sludge contaminated by zinc. The paper analyzed the curing effect of slag on cement-soil by using different mixture ratios for cement-slag based on 15% cement standard additive. Through the unconfined compressive strength test,leaching experiment,and scanning electron microscopy; the paper analyzed the mechanical strength characteristics,stabilization effect of solidified and microstructure characteristics respectively. The results showed that the compressive strength of zinc polluted sludge cured by cement-slag increased with the increase of additive content and its age. The solidification effect of cement-slag and additive was better than single additive cement. Also,the stabilization and curing effects were better when the zinc polluted sludge with content was equal or less than 5 000 mg/kg. The effect of K2( 15% cement + 10% slag) on the solidification stability of zinc contaminated sludge was relatively good.