城市污水处理厂剩余污泥热值估算方法研究

Study on estimating caloric value of excess sludge from municipal wastewater treatment plants

污水处理厂剩余污泥所具有的热值是衡量其能量利用价值的重要指标。目前的热值分析方法检测步骤繁琐、成本高,在污水处理厂的实际应用中有一定的困难。以北京市5座污水处理厂的剩余污泥为研究对象,通过测量污泥样品的挥发性固体(VS)与总固体(TS)含量和污泥的热值,发现污泥的VS/TS与污泥热值具有良好的线性关系,由此确定出估算污泥热值的计算公式。并采用多座污水处理厂的污泥数据对公式的适用性进行验证。对比分析表明,该公式能较准确地估算污泥热值,且其操作和所需仪器设备更为简单,能够根据污水处理厂日常对VS和TS的分析值快速估算污泥的热值。

The caloric value of excess sludge from wastewater treatment plants （WWTPs） has been regarded as an important index to its potential energy ulitization evaluation. However, the current caloric value analysis and measure method is complicated and costly, so there are still some difficutlies for its practical application in wastewater treatment plants. In this paper, the volatile solid （VS）, total solid （TS） and caloric value of excess sewage sludge from five WWTPs in Beijing were studied. The results showed that there was a significant linear correlation between VS/TS and caloric value. Based on this relationship, the estimation formula of excess sludge caloric value was determined, and sludge data from several WWTPs were used to test its applicability. The contrastive analysis showed that this formula could predict the caloric value of sludge relatively precisely, its operation and required equipments were more simple and it could quickly estimate the caloric value of sludge according to the VS and TS in daily WWTPs operation.