低碳城市污水反硝化除磷若干影响因素的试验研究

广州地区城市污水碳量严重偏低、碳氮磷比例失调,其同步脱氮除磷一直是个难题,为此以SBR法进行反硝化除磷影响因素的试验研究.试验表明:缺氧段硝酸盐负荷决定反硝化吸磷效果,在硝酸盐足量情况下,缺氧除磷率达到99.4%.通过对ORP与pH的在线监测发现,ORP无法作为缺氧吸磷过程的控制参数,pH可以指示缺氧吸磷情况.以亚硝酸盐氮作为电子受体研究发现,15 mg/L以下的亚硝酸盐氮可以作为电子受体进行吸磷作用,当亚硝酸盐氮浓度达到23.8 mg/L时,反硝化吸磷受到了明显的抑制;厌氧初始pH在6～8变化时,厌氧释磷量随着pH的升高而增加,pH变化只影响厌氧释磷量,不影响释磷速率.缺氧初始pH降到6时,反硝化吸磷效果变差,缺氧段pH偏碱性条件下,反硝化除磷仍能够稳定进行.

Study on affecting factors to phosphorus removal from urban wastewater with low carbon source in denitrifying process

The disproportion of C,N and P and low carbon source in the urban wastewater in Guangzhou region are always a puzzle for nitrogen and phosphorus removal.Based on this,this paper studied the affecting factors to phosphorus removal in SBR operating in denitrifying process.The experiments showed that the nitrate load in anoxic phase determined the effect of phosphorus removal,the efficiency of phosphorus removal can be 99.4% when nitrate was enough.The on-line monitoring of ORP and pH disclosed that ORP can't be the controlling parameter under anoxic condition,and pH can reflect the condition of phosphorus uptake in anoxic phase.Nitrite less than 15 mg/L could be electron acceptor.When nitrite concentration reached 23.8 mg/L,both the denitrification and phosphorus uptake were inhibited.When pH varied from 6 to 8 in anaerobic phase,the quantity of phosphorus release increased.The variation of pH only had effect on the quantity of phosphorus release,no effect on the velocity of phosphorus release.In anoxic phase,when pH reached 6,phosphorus uptake got bad,when pH was little alkalic,phosphorus removal operated in steady state.