摘要
在SBR中通过投加颗粒活性炭并设置生物选择器以促进好氧颗粒污泥(AGS)的形成,并研究出水回流对系统稳定性的影响,为AGS工艺的发展提供技术支持。由于操作不当及蚊蝇幼虫大量繁殖,导致第一次培养在20 d时发生污泥膨胀。第二次培养时接种污水处理厂剩余污泥,设置厌氧生物选择器并投加20 g活性炭,在第3天即观察到新生的长丝状生物膜及不规则的AGS,21 d时几乎全部以菌胶团及AGS的形式存在,25 d时SV30/SV5、SVI、MLSS及含水率分别为83.03%、40.64 m L/g、6.7 g/L及97.90%,反应器对COD、TIN及TP的去除率保持在90%以上。随着回流量的增大,系统的稳定性受到一定冲击,导致污泥理化特性及出水水质发生异常波动。为减小外部冲击的影响,微生物通过增加或减少EPS的分泌以适应新的环境,使得自第22天开始污泥理化特性逐渐趋稳。而出水氨氮和SS浓度明显升高,主要是混合液盐度的增加导致絮体难以下沉,引起出水SS的升高及污泥龄的减小,从而削弱了反应器的硝化能力。
In order to promote the formation of aerobic granular sludge （ AGS）, granular activated carbon was added and biological selector was employed in a lab-scale SBR, and the effect of effluent re- flux on the stability of the system was investigated, which could provide technical support for the develop- ment of AGS technology. Due to improper operation and over-b bulking took place on the 20th day during the first cultivation. reeding of mosquito and fly larvae, sludge Excess activated sludge from municipal wastewater treatment plant was inoculated during the second cultivation, while anaerobic biological selec- tor was employed and 20 g of activated carbon was added. New biofilm and irregular AGS appeared on the 34 day, and the reactor was full of zoogloea and AGS on the 21st day. SV30/SV5, SVI, MLSS and water content of the sludge were 83.03%, 40.64 mL/g, 6.7 g/L and 97.90% on the 25th day, while the removal rates of COD, TIN and TP were all over 90%. With the increase of reflux volume, the stabil- ity of the system was affected, which led to abnormal fluctuation of physical and chemical properties ofthe sludge and effluent quality. To reduce the influence of external shocks, microorganisms secreted more or less EPS to adapt to the new environment, physical and chemical properties of the sludge tended to be stable since the 22na day. On the other hand, ammonia nitrogen and SS of the effluent rose obviously. The increase of salinity led to poor settlement of floc sludge, which caused the increase of effluent SS and the decrease of the sludge age, thus weakening the nitrification ability of the reactor.
出处
《中国给水排水》
CAS
CSCD
北大核心
2016年第21期17-22,27,共7页
China Water & Wastewater
基金
江西省教育厅科技项目(GJJ150627)
