Application of municipal sewage sludge in the process of sintering brick
以城市污泥为掺料制备烧结砖

Municipal sewage sludge was used as the raw materials to produce sintered bricks,the physical and mechanical properties of the sintered brick under different contents of sludge and sintering temperatures were particularly analyzed.The results indicated that sewage sludge could be used as raw material to produce sintering brick,and both of the physical and mechanical properties of the sintered brick could meet the required standard under the conditions that the content of sludge was no more than 12% and the sintering temperature was 1 100 ℃.TCLP test was taken to examine the safety of sintered brick and the solidified effect to heavy metals(the content of sludge was 12% and the temperature was 1 100 ℃).It was indicated that the leaching toxicity of most heavy metals decreased after calcining at high temperature,which could meet the required standard and also be harmless to the environment;Zn had the best solidification effect while Cr had the worst.