二段上流式曝气生物滤池去除高标准景观补给水中氮磷营养物

ENHANCED NITROGEN AND PHOSPHORUS REMOVAL WITH A TWO-STAGE SUBMERGED BIOFILTER FOR RECLAIMED WATER WITH THE STRINGENT STANDARDS FOR SCENIC ENVIRONMENT USE

虑及回用水中营养物质对水体富营养化的不利影响,许多地区对景观补给水的氮磷含量制定了极为严格的标准。本研究考察了作为三级处理工艺的二段上流式曝气生物滤池在硝化、反硝化、化学除磷效率等方面的相关影响因素及工艺的可行性,并进行了设计参数的优化。试验结果表明,此二段上流式曝气生物滤池的最后出水可满足回用水总氮小于2mg/L,总磷小于0.3mg/L的严格要求,且其较高的处理效率使得反应器可在较高的水力负荷下仍接近完全硝化与反硝化;在反应器的处理能力内,硝化和反硝化反应可以在较高的滤速下达到更好的处理效果;本工艺在抗水力负荷冲击方面有较大的优势。

The correlative affecting factors and the applicability of technological process were investigated in respects of nitrification, denitrification and chmical phosphorus removal etc. by two-stage up-flow aeration biological filter, and the design parameter were optimized. It was shown that the final effluent from the biological filter could meet the strict requirements of TN in reclaimed water being less than 2mg/L, TP being less than 0.3mg/L, and its higher treating efficiency made the reactor approaching full nitrification and denitrification under a higher hydraulic load; within the treating capacity of the reactor, nitrification and denitrification reactions might attain better treating effect of higher filtration speed; the technological process had greater superiority in respect to hydraulic load impact resistance.