城市污水厂污泥快速好氧堆肥技术研究

以污泥静态堆肥工艺为基础,针对上海曲阳污水处理厂的脱水污泥进行动态好氧堆肥处理工艺研究,重点研究了控制参数和评价参数(温度、含水率、pH、水溶性有机碳和发芽指数等)变化规律.结果表明:污泥堆肥过程中,含水率、物料温度、水溶性有机碳、发芽指数等指标变化规律性强,效果指示性明显,均可选作堆肥腐熟度的表征参数或评价参数.在优化工艺条件下,通过添加适量的木屑和回流物料,控制物料初始含水率在60%±2%时,堆肥处理可以实现顺利升温并在>55℃维持4d,100%杀灭了病原菌;14d反应周期结束时,物料含水率显著降低,水溶性有机质降解50%左右,出料松散且无臭味,堆肥产品腐熟,卫生学指标达到了我国标准和美国EPA污泥产品A类标准.

Rapid and High-Efficient Composting Process of Municipal Sewage Sludge

Based on the static composting process of the municipal sewage sludge (MSS), the paper demonstrates the dynamic composting process of the MSS from Shanghai Quyang Municipal Wastewater Treatment Plant. The dynamics of different operational and evaluating indices during the treatment process are discussed, such as water content, temperature, pH, dissolved organic carbon (DOC) and germination index (GI) and so on. It is concluded that the water content of materials, temperature,DOC and GI can be interpreted as the evaluating indices of the maturation of MSS. Under optimized condition, when the water content of initial materials was adjusted to 60%2% with appropriate sawdust and recycled materials, the results indicated that the temperature of composting materials could reach >55 rapidly and last 4 days,thus 100% of the pathogens would be killed out. In the end of composting process, the water content of outputs was reduced exactly to about 35%, DOC could be decomposed by about 50%. The incompact, odorless, and almost mature output could meet the land application control standard of MSS and the class A standard of US EPA.