为解决填埋场扩容扩建工程中所面临的污泥坑内市政污泥含水率高、强度低的问题，本文提出了硫酸亚铁协同胶凝材料(石灰、粉煤灰和水泥)原位固化填埋污泥的方法，并利用响应面法对该协同固化方法进行掺量优化。研究结果表明，硫酸亚铁与胶凝材料均能降低固化污泥的含水率，其中石灰、水泥的降低效果更加显著；固化污泥的无侧限抗压强度(UCS)随硫酸亚铁、水泥掺量的增加而增大，随石灰掺量先增大后减小，但基本不随粉煤灰掺量发生变化；由响应面法得出的二次多项式模型能较准确地预测出固化污泥的含水率和UCS，经验证其预测值与试验值之间的相对误差小于20%；在本文设置的约束条件下，推荐的优化方案R7(硫酸亚铁= 8%，石灰= 6%，粉煤灰= 10%，水泥= 11%)中固化污泥的含水率由360.3%降低至131.5%、UCS由0增大到317.0 kPa，满足填埋处置规定以及机械进场要求。

In order to solve the problems of high water content and low strength of municipal sludge in the landfill, a synergistic method using ferrous sulfate and cementitious materials (such as lime, fly ash, and cement) was proposed to solidify landfilled sludge in-situ, and its reagent dosage was further optimized by the response surface method (RSM). The results showed that both ferrous sulfate and cementitious materials could reduce the water content of solidified sludge, but the reduction effect of lime and cement was more significant; the unconfined compressive strength (UCS) of solidified sludge increased with ferrous sulfate dosage and cement dosage, but first increased and then decreased with lime dosage, and basically did not change with fly ash; the quadratic polynomial model obtained by RSM could accurately predict the water content and UCS of solidified sludge, and it was verified that the relative error between the predicted value and the experimental value was less than 20%; under the constraints set in this study, the water content of solidified sludge in the recommended solution R7 (ferrous sulfate = 8%, lime = 6%, fly ash = 10%, and cement = 11%) reduced from 360.3% to 131.5%, and UCS increased from 0 to 317.0 kPa, which met the requirements of landfill disposal and mechanical entry.

TU375.4

国家重点研发计划（2019YFC1806003）