School of Environmental and Municipal Engineering,Tianjin Chengjian University
The National Natural Science Foundation of China
为了确定SBR强化生物除磷(EBPR)颗粒污泥系统的启动方法及其影响条件, 对生物除磷工艺的实际应用提供理论基础.采用有效容积为12LSBR反应器,以乙酸钠为碳源, KH2PO4为磷源,对颗粒EBPR系统的启动及除磷性能?污泥颗粒化过程进行了研究.结果表明,当进水碳磷比过低(C:P=200:15)碳源不足时,并且存在其他异养菌竞争碳源,让除磷效率较低.与25℃相比,15℃条件下污泥EPS含量增加.此外,在15℃使得有助于污泥颗粒化的蛋白质(PN)含量增加更为显著,污泥粒径增长明显.且低温更利于传统EBPR系统中主要负责生物除磷的微生物红环菌属(Rhodocyclus)的生长,使其成为系统优势菌种,提高除磷效率。
In order to determine the start-up method and influence conditions of SBR enhanced biological phosphorus removal (EBPR) granular sludge system and provide theoretical basis for the practical application of EBPR. The start-up and phosphorus removal performance of granular EBPR system and the process of sludge granulation were studied in SBR reactor with an working volume of 12L where sodium acetate was used as carbon source and KH2PO4 was used as phosphorus source. The results showed that when the ratio of carbon to phosphorus in influent water was in lower level(C:P=200:15), and there were other heterotrophic bacteria, the phosphorus removal efficiencies were lower. Compared with 25 ℃, 15 ℃ will increase EPS content of sludge, EPS content of sludge at 25℃ was more than that at 15℃. Moreover, the increase of protein (PN) content was more obvious at 15℃, which was beneficial to the sludge granulation , obvious increase of sludge particle size .And low temperature more favorable for the growth of Rhodocyclus which is mainly responsible for biological phosphorus removal in traditional EBPR system. So that Rhodocyclus became the dominant bacteria in the system and improved the phosphorus removal efficiencies.