采用SBR／MBBR法改造ICEAS工艺的效果分析

Efficiency Analysis of ICEAS Process Reconstruction Using SBR/MBBR

青岛某污水处理厂采用ICEAS工艺,由于进水中工业废水所占比例高达70%,致使可生化性较差;同时,连续进水、间歇排水的运行方式又使得部分碳源在曝气阶段被去除,系统的反硝化受限。为此,采用SBR/MBBR工艺对原ICEAS工艺进行升级改造,通过投加悬浮填料、增加搅拌器以提高生物脱氮能力。运行结果表明,连续式进水可以加速悬浮填料的挂膜;改造后的出水COD、SS、NH_4^+-N浓度均可达到《城镇污水处理厂污染物排放标准》的一级A标准;但在进水TN负荷较高的情况下需要投加少量的外碳源以提高脱氮能力;经改造后生物池的能耗下降了约9.85%。

ICEAS process was used in a sewage treatment plant of Qingdao. Because the proportion of industrial wastewater was up to 70% , the biodegradability was poor, and moreover, the operation mode of continuous influent and intermittent effluent made some carbon source removed in the aeration phase, the denitrification of the system was limited. Therefore, SBR and MBBR technologies were selected in upgrading reconstruction of ICEAS process to enhance biological nitrogen removal by using suspended carriers and adding stirrers. The operation results show that continuous influent can speed up the biofilm formation on the suspended carriers. The concentrations of COD, SS and NH4^＋ - N of the effluent can meet the first level A criteria specified in Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant （GB 18918 -2002） after the reconstruction. It takes a small amount of external carbon source to improve nitrogen removal capacity when the influent TN loading is high. The energy consumption of the bioreactor is reduced by 9.85% after the reconstruction.