HITNP同步除磷脱氮新工艺

HITNP同步除磷脱氮新工艺采用复合式活性污泥生物膜系统，避免了硝化菌和聚磷菌的污泥龄矛盾.利用反硝化除磷的“一碳两用”缓解原水碳源不足的矛盾.通过独特的硝化液回流方式，使全部污泥经历了释磷和聚磷循环，厌氧池污泥浓度是缺氧池污泥浓度的1.5～2倍，对进水中的大分子有机物降解效果好，厌氧池COD的去除率高，强化系统的除磷能力.以低碳氮比的生活污水为处理对象，长期的运行结果表明，该工艺出水中的总磷、氨氮、总氮和COD的去除率分别为91.1% 、88.7%、58.1%和88.6%.出水水质平均值为磷0.27 　mg/L，氨氮1.74 　mg/L，总氮17.30 　mg/L和COD 24.38 　mg/L.HITNP同步除磷脱氮新工艺具有稳定的同步除磷脱氮效果，出水达到国家城市污水厂污染物排放标准GB18918-2002一级B标准要求.

Simultaneous Phosphorus and Nitrogen Removal in Novel HITNP System

Simultaneous fixed-film nitrification,denitrification and enhanced phosphorus uptake were investigated in a lab-scale HITNP(Harbin Initiative Technology of Nitrogen and Phosphorus removal) configuration.This innovative nutrient removal process was a combined activated sludge and fixed-film process,worked with supernatant recycle regime.Hybrid activated sludge-biofilm reactor was applied in the experiment unit to solve the problem of overgrowing of slow growing nitrifiers by faster heterotrophs.High anaerobic sludge concentration originated from supernatant recycle and total anaerobic/aerobic sludge recycle of HITNP other than part sludge recycle of traditional A~2/O configuration contributed to high phosphorus removal efficiency.The purpose of the experiment was to examine phosphorus and nitrogen removal capacity of urban sewage by the HITNP system.Results of long term operation of HITNP working with low TKN/COD ratio domestic wastewater show effective phosphorus and nitrogen removal efficiency because it maximizes the utilization of organic substrate for phosphorus and nitrogen removal by simultaneous anoxic phosphorus uptake and denitrification.The removal efficiency and effluent concentration of TP,NH~ _4-N,TN and COD are 91.1%,88.7%,58.1%,88.6% and 0.27(mg/L),1.74(mg/L),17.30(mg/L) and 24.38(mg/L) in average,respectively.