生物吸附/MBR/硫铁自养反硝化组合工艺运行特性及蛋白质源污泥增量研究

为实现污水处理的深度脱氮除磷及蛋白质源污泥增量,进行了生物吸附/MBR/硫铁自养反硝化组合工艺处理城镇污水的试验研究.结果表明,生物吸附池可以快速富集进水中的大部分有机物,COD平均去除率为55.1%,剩余污泥采用厌氧发酵方式处理,用于生产优质碳源.通过组合工艺系统中的硝化、硫自养反硝化及铁屑除磷作用,出水氨氮、总氮和总磷分别达到1、5和0.4 mg·L~(-1)以下.优质碳源投加到MBR工艺段,碳源环境的改善使得污泥增长率从0.17 g VSS/g COD提高至0.49 g VSS/g COD,进水中总氮的同化比例从40%提高至59%.此外,污泥中蛋白质及氨基酸含量也显著增长,增长率分别为18.3%和19.7%.组合工艺在获得高排放标准水质的同时,实现了高蛋白质源污泥的增量,可为污泥资源化利用提供优质原料.

The performance and protein source sludge increment of a combined biological adsorption-MBR-Sulfur/iron autotrophic denitrification process

In order to realize the advanced nitrogen and phosphorus removal in domestic sewage treatment and the increment of protein source in sludge, a combined process of biological adsorption/MBR/sulfur-iron autotrophic denitrification was carried out. The experimental results show that the majority of organic matter in influent can be rapidly transferred to the sludge by biological adsorption process, and the average removal rate of COD was 55.1%. The sludge produced by biological adsorption process was then transformed to carbon source by anaerobic fermentation technology, and the concentration of ammonia nitrogen, total nitrogen and total phosphorus in effluent were 1, 5 and 0.4 mg·L^-1, respectively, through nitrification in MBR process, sulfur autotrophic denitrification and phosphorus removal by iron. Furthermore, sludge growth rate increased from 0.17 g VSS/g COD to 0.49 g VSS/g COD and nitrogen assimilation ratio drastically increased from 40% to 59% due to the addition of high-quality carbon source in MBR process. In addition, both of the protein content and amino acid content in sludge increased significantly, and the growth rates were 18.3% and 19.7%, respectively. With the achievement of good effluent, the combined process obtained great increment of high protein source sludge, which provides high-quality raw materials for the use of sludge resources.