菌藻生物膜反应器内菌藻的培养方式和运行状况

Cultivation and Operation of Bacteria and Algae in Biofilm Photoreactor

为了解决传统活性污泥法对污水中TN去除率不高的问题,探究菌藻共生系统对TN的去除效果,将市政污水处理厂好氧池的活性污泥和二沉池壁的藻类接种至内置纤维填料的菌藻生物膜反应器中,以市政污水为进水进行菌藻的共同培养,分析了培养方式和曝气量对反应器中藻类生长情况以及出水水质的影响。结果表明,白天光照静沉+夜间曝气的培养方式能使菌藻去除更多的COD、TN和TP;曝气量为300 L/h的反应器内藻类含量比曝气量为800 L/h的更高。在曝气量为300 L/h、换水率为34.4%的条件下,曝气1 h+光照静沉1 h后,反应器对TN的去除率可达到64%~66%,高于传统的淹没式生物膜工艺。

To solve the problem of low TN removal efficiency in sewage by traditional activated sludge process,the removal of TN by a bacterial and algal symbiotic system was investigated.The activated sludge in an aerobic tank and algae on the wall of a secondary sedimentation tank of a municipal wastewater treatment plant were inoculated into the photobioreactor with built-in biological filler.The bacteria and algae were cultivated by feeding municipal sewage in the photobioreactor.The effects of cultivation strategy and aeration rate on the growth of algae and the effluent quality were analyzed.More COD,TN and TP could be removed by the cultivation method of lighting and static precipitation at daytime and aeration at night.The algal content in the reactor with an aeration rate of 300 L/h was higher than that in the reactor with an aeration rate of 800 L/h.Under the conditions of 300 L/h aeration rate and 34.4%water exchange rate,the removal efficiency of TN reached 64%-66%after 1 h aeration and 1 h lighting along with static precipitation,which was higher than that of the traditional submerged biofilm process.