污泥焚烧底灰的理化性质及再利用技术

摘要

The problem of disposal and utilization of bottom ash of sewage sludge incineration in sludge incineration process must be solved. In this paper,the physicochemical properties in terms of particle size,shear,compression consolidation,permeability,heavy metals content of two different kinds of bottom ash of sewage sludge incineration were studied and compared with the original sewage sludge properties to analyze the effect of incineration on sewage sludge treatment. The reuse technology of bottom ash of sewage sludge incineration was also explored based on its physicochemical properties. The results show that bottom ash of sewage sludge incineration belongs to sandy soil,and the shear strength significantly increases after the incineration,which can reach 76. 23 ~80. 03 kPa;the heavy metal content is over standard,while the heavy metal leaching amount is less than the corresponding standard limit. It can be used in subgrade materials,CO2 capture and sea reclamation.%污泥焚烧底灰的处理处置与资源化利用是污泥焚烧过程中必须解决的难题。该文通过对两种不同的污泥焚烧底灰的粒径、抗剪、压缩固结性、渗透性以及重金属含量等理化性质进行了研究，并将其与原生污泥性质进行对比，分析焚烧处理对污泥理化性质的影响，并进一步根据焚烧底灰性质，探索其再利用途径。结果表明污泥焚烧底灰属于砂土，且抗剪强度较污泥焚烧前有明显增大，可达76．23～80．03 kPa；重金属含量有所超标，但重金属浸出量均小于相应标准限定值，可进行路基材料、CO2捕集、填海造陆等再利用。