团岛污水厂MBBR工艺的升级改造及运行效果

Design Features and Operational Effect of Tuandao WWTP Upgrading by MBBR in Qingdao

针对青岛市团岛污水处理厂升级改造过程中存在实际进水水质大大超过设计标准、出水水质标准提高、厂内已无发展用地等问题,对污水厂原有改良A2/O工艺进行改造;优先保证反硝化所需的缺氧区池容,硝化不足部分通过投加SPR-1生物填料来保证,将好氧段改造为生物膜—活性污泥复合工艺,填充率约为29%,悬浮污泥泥龄为5.5 d,生物膜泥龄约为24 d,曝气系统采用中小孔径穿孔管曝气,无需增购鼓风机;运行三年来,效果良好,抗冲击负荷能力强,可同时强化脱氮除磷,对难降解有机物具有一定的处理能力,主要水质指标均稳定达到一级A标准;整个系统内填料流化状态良好,并未出现填料的堆积及堵塞筛网,改造后系统的运行能耗与改造前基本相同,并未增加;该工艺可大幅减少工程量,具有运行费用低、运行管理简便、处理效果稳定等特点,可较好地解决市政污水厂升级改造中的难题。

To solve problems, such as much higher actual influent quality than design standards, stricter effluent discharge standard and no land for development in the Tuandao WWTP in Qiangdao City, the existing improved A2/O process of WWTP should be upgraded. It should be a priority to ensure anox- ic zone volume for denitrification, and lack of nitrification volume could be compensated by dosing SPR- 1 biological filter media. In the combined process of biofilm and activated sludge newly adopted in the aerobic zone, the filling rate is approximately 29% , suspended sludge age is 5.5 d, biofilm sludge age was approximately 24 d, and medium and small diameter perforated pipes are used in the aeration sys- tem, without addition of the blower. The system has operated well since being upgraded three years ago, with strong resistance to impact load. The removal of nitrogen and phosphorus could be enhanced simulta- neously, and refractory organics could be removed to some extent. The main quality indicators met thefirst level A criteria. There was good fluidized state of the filler in the whole system, tion and screens clogged did not appear. The operational energy consumption after u and filler accumula- pgrading was almost the same as before upgrading. The combined process could significantly reduce the work amount, with a low operation cost, easy operation and management, high process efficiency and stability. It can be used in solving problems of municipal sewage plant upgrading.