新型生物沸石填料在污水深度处理中的应用研究

Application investigation on a new type of composite ball carrier in sewage reclamation and reuse

新型生物沸石填料为生物沸石和悬浮球填料有机组合在一起的一种新型悬浮球填料，与悬浮球填料相比该填料比表面积增加约2～4倍，约为711～1185m^-1，表面粗糙；在污水深度处理中，易于挂膜，且生物相高级、丰富、不易脱落；孔隙率为90％，不易堵塞．该新型填料长有的生物膜致密，沸石内部的孔穴中长有较多的原生物，有利于氨氮的转化．实验表明：填有该新型填料的曝气生物流化床在稳定状态处理城市污水厂二级出水时，出水CODcr质量浓度为10～36mg·L^-1,去除率为48％～81％；出水NH^＋ 4—N质量浓度可以保持不大于2mg·L^-1，去除率不小于89％．出水水质能满足再生水用于循环冷却水的水质要求．

A new bio-carrier with large specific surface area was made by combination of both suspended carrier and solid carrier. The specific surface area of this new type of combined ball carrier was 711 - 1 185 m^- 1 about 3- 5 times as large as than that of suspended carrier. During the advanced treatment process of domestic wastewater, biofilm generated on the surface easily and fast, and microbe was advanced, abundant and difficult to be brushed off. The new carrier with 90 % porosity was not easy to be plugged. It is dense biofilm on the surface and abundant protoplast growing in cavities of the zeolite that avail nitrogen removal. Experimental results show that a fluidized bed reactor with the new carrier can treat the secondary effluent very well in stable condition, after the treatment the CODcr concentration of effluent is from 10 mg·L^-1 to 36 mg·L^-1 with a removal rate in 48 % - 81% and the NH^＋ 4 -N concentration of effluent was no more than 2 mg·L^-1 with a removal rate of no lower than 89 %. It can be concluded that water quality after treatment can meet the criterion of cooling water quality.