污泥间接热干化过程尾气排放特性及生成机理分析

Emission Characteristics and Formation Mechanism Analysis of Exhaust during Sludge Thermal Drying Process

通过对热干化前后污泥成分分析以及干化过程中尾气排放特性曲线测定,对污泥干化过程尾气的生成机理进行了分析。研究发现污泥经过干化之后,污泥的干基有机质和蛋白质含量均减小,污泥中的有机质是污泥干化过程中尾气生成的重要反应物。用基于傅立叶变换红外光谱的Gasmet DX-4000烟气分析仪对NH_3、CH_4、SO_23种主要气体污染物的排放进行实时测定,结果表明,NH_3是污泥间接热干化过程中产生的首要气体污染物,其排放与污泥中含有的蛋白质直接相关,CH_4和SO_2的排放与污泥中的蛋白质无关,是由污泥中含有的其他有机物反应产生。

Through the components analysis of the sludge before and after the thermal drying process and emission characteristics curves determination, the formation mechanism of the exhaust was analyzed. It was discovered that the organic matter and protein content of the sludge decreased after thermal drying. So the organic matter is the important reactant of exhausts formation. Sludge drying tests have been carried out on a small paddle drying machine. The exhaust NH3,CH4,CO2 which were the major pollutants were analyzed by Gasmet DX-4000. The results showed that NH3 is the primary pollutant during sludge thermal drying process, which is directly related to the protein in the sludge. CH4 and SO2 were generated through the reactions of other organic matters in the sludge.