富阳八一污水厂污泥在热电厂焚烧的可行性分析

Feasibility Analysis of Incineration of Sewage Sludge from Fuyang Bayi Wastewater Treatment Plant in a Power Plant

富阳八一污水处理厂95%的进水为附近40多家造纸厂排放的废水,针对污水厂污泥产量大(剩余污泥约5.2t/h,初沉污泥约16t/h)、填埋处理存在占地大且易产生二次污染的问题,分析了将污泥在热电厂进行焚烧的可行性,并探讨了污泥的输送和投加方式。结果表明,八一污水厂的剩余污泥可全部运到相邻的热电厂与煤进行混合焚烧,理论上每台流化床锅炉最多可以混合焚烧3.9t/h的剩余污泥,实际运行中应控制剩余污泥的投量为3.5t/h;建议污泥采用卡车和稠污泥泵共同输送的方式。污泥混合焚烧具有控制简单、污水厂和热电厂间协调工作较少的优点。

Ninety-five percent of the influent of Fuyang Bayi Wastewater Treatment Plant is from more than 40 paper mills nearby. Aimed at the large quantity of sewage sludge with primary sludge of 16 t/h and excess sludge of 5.2 t/h, large occupancy area of landfill disposal sites and secondary contamination, the feasibility of incineration of the sludge in a close power plant was analyzed. Besides, the methods to deliver and add the dewatered sludge were discussed. The results show that the all excess sludge can be delivered to the power plant for co-incineration together with coal. According to the calculation, every flui-dized bed boiler can theoretically co-incinerate an amount of up to 3.9 t excess sludge per hour. The addition of 3.5 t excess sludge per hour should be controlled in practice. It is suggested that the sludge is delivered with trucks and thick sludge pumps. The sludge co-incineration has advantages of simple control and less coordination work between the wastewater treatment plant and the power plant.