基于污染物超低排放与蛋白质源污泥增量的污水处理工艺对比研究

为了实现污水处理的深度脱氮除磷及蛋白质源污泥增量,分别采用生物吸附/A~2O和生物吸附/MBR/硫铁自养反硝化工艺进行对比试验研究.结果表明,生物吸附工艺可以快速富集进水中的大部分有机物,剩余污泥采用厌氧发酵方式处理,用于生产优质碳源.两套污水处理工艺均获得了优质水质,出水氨氮、总氮和总磷分别达到5、7和0.4 mg·L~(-1)以下.优质碳源投加到A~2O和MBR工艺段,碳源环境的改善使得污泥增长率和氮的同化比例显著提高,第4阶段污泥产率分别达到0.59和0.49 g·g~(-1)(以每g COD产VSS量(g)计),氮的同化率分别达到66%和59%.此外,污泥中蛋白质及氨基酸含量也显著增长,A~2O工艺段增长率分别为34.7%和31.2%,MBR工艺段相应的增长率分别为19.7%和18.3%,实现了蛋白质源污泥的增量,为污泥资源化利用提供了优质原料.

Comparative study of wastewater treatment processes based on contaminants removal and protein increment from sludge

In order to realize the advanced nitrogen and phosphorus removal in domestic sewage treatment and the increment of protein source in sludge, the comparative study of biological adsorption-A²O and 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 through biological adsorption process. The sludge produced during biological adsorption process was then transformed to carbon source by anaerobic fermentation technology, after which the carbon sources were subsequently added to the A²O and MBR sections. Both two processes achieved high quality effluent, and the effluent concentration of ammonia nitrogen, total nitrogen and total phosphorus were below 5, 7 and 0.4 mg·L^-1, respectively. In addition, the improvement of the carbon source resultes in a significant increase of sludge growth rate and nitrogen assimilation ratio. In the fourth stage, the sludge growth rate and the nitrogen assimilation ratio of the two processes reached 0.59 g·g^-1 and 66%, 0.49 g·g^-1 and 59%, respectively. Moreover, the sludge protein and amino acid contents also significantly increased, the growth rates were 34.7% and 31.2% in A²O section, and the corresponding growth rate of 19.7% and 18.3% in MBR section, which obtains great increment of protein source in sludge and provides high-quality raw materials for the use of sludge resources.