颗粒污泥膜生物反应器同步硝化反硝化

在本实验条件下,厌氧-好氧序批式颗粒污泥膜生物反应器(GMBR)处理人工配水,结果表明,GMBR具有良好的有机物去除及脱氮效果,当进水TOC及氨氮分别为160.9～308.4mg/L、29.8～83.6mg/L时,GMBR的TOC、氨氮及总氮去除率分别为65.7%～98.6%、85.4%～98.9%及66.1%～95.1%.对于GMBR典型周期TOC、胞内聚β-羟基丁酸(PHB)、氨氮、硝酸盐氮及亚硝酸盐氮变化进行分析,结果表明,有机物主要在厌氧阶段去除并以胞内多聚物PHB形式储存,氨氮在好氧阶段经由同步硝化反硝化(SND)去除,并且反硝化碳源主要来自胞内储存物质PHB.以外源溶解性基质及胞内储存物质为碳源的批式实验表明,以外源基质为碳源的缺氧反硝化速率为胞内储存物质的4.2倍;以外源基质及胞内PHB为碳源的好氧SND效率分别为49.9%、82.5%.胞内储存物质PHB的慢速降解特性使得硝化与反硝化过程能够同步进行.

Synchronous nitrification denitrification in granular sludge membrane bioreactor

Anaerobic-aerobic sequencing batch granular sludge membrane bioreactor(GMBR) possessed good organics and nitrogen removal effects. TOC, ammonium nitrogen and total nitrogen removal rates of GMBR were 65.7%~98.6%, 85.4%~98.9% and 66.1%~95.1% respectively when influent TOC, ammonium nitrogen were 160.9~308.4mg/L and 29.8~83.6mg/L respectively. Analyzing the variation of TOC, intracellular PHB, ammonium, nitrogen nitrite and nitrate nitrogen in typical cycle in GMBR. Organic substance was removed mainly in anaerobic stage and stored as intracellular polymer PHB form, and ammonium nitrogen was removed via synchronous nitrification denitrification in aerobic stage and denitrification soma come mainly from intercellular storing substance PHB. The batch tests using extra source soluble basic substance and intracellular stored substance as carbon source showed that anoxic denitrification rate of using extra source was 4.2 times of that using stored substance as carbon source; and aerobic SND efficiencies of extracellular basic substance and intracellular PHB as carbon source were 49.9% and 82.5% respectively. The slow degradation character of PHB intercellular stored substance made the nitrification and denitrification processes capable to carry and synchronically; thus, good SND effect could be obtained.