Abstract:

Carbon emission during the sludge treatment and disposal process is an important source of carbon emission in the sewage treatment industry. The drying process can achieve the reduction and stabilization of sludge, reducing its adverse impact on the environment. Aiming at the problems of reduction and resourceization in the process of municipal sludge treatment, municipal sludge with water content of 40%-80% was taken as the research object, and a multi-dimensional evaluation of the disc drying and low-temperature drying technologies was carried out by comparing and analyzing the working principle, economic cost, carbon emission, and other indexes. The results showed that the low temperature drying technology had better condensate quality, lower wastewater treatment cost, less odor volume and simple composition. Disc drying technology process was mature, adapted to large-scale sludge disposal project, low investment cost, simple structure, small footprint, low performance decay rate, and stable operation. In addition, the carbon emission of low-temperature drying technology for treating per unit mass of sludge was 907.94 kg/t(calculated as CO₂-eq), while the carbon emission of disc drying was 1 262.80 kg/t(calculated as CO₂-eq). The effect of low-temperature belt drying technology in reducing the pollution and carbon was remarkable.

Key words: disc drying, low temperature belt drying, carbon emissions, municipal sludge, multi-dimensional assessment

摘要：

污泥处理处置过程中的碳排放是污水处理行业重要的碳排放来源。污泥干化过程可以实现污泥的减量化和稳定化，减少其对环境的不良影响。针对市政污泥处理过程中减量化和资源化问题，以含水率40%~80%的市政污泥为研究对象，通过对比分析圆盘干化和低温干化技术的工作原理、经济成本、碳排放等多个指标，对两种技术进行多维度评估。研究结果表明，低温干化技术冷凝水水质好，废水处理成本低，臭气量少且成分简单。圆盘干化技术工艺成熟，适应大型污泥处置工程，投资成本低，结构简单，占地面积小，性能衰减率低，运行稳定。此外，低温干化技术处理单位质量污泥的碳排放量（以CO₂-eq计）为907.94 kg/t，而圆盘干化的碳排放量（以CO₂-eq计）为1 262.80 kg/t，采用低温带式干化技术减污降碳效果显著。

关键词: 圆盘干化, 低温带式干化, 碳排放, 市政污泥, 多维度评估

CLC Number: 

• X703