污水反硝化过程中亚硝酸盐的积累规律  

Characteristics of Nitrite Accumulation During Wastewater Denitrification

作　　者：付昆明[1] 曹相生[2] 孟雪征[2] 朱兆亮[3] 钱栋[2] 

机构地区：[1]北京建筑工程学院城市雨水系统与水环境省部共建教育部重点实验室,北京100044 [2]北京工业大学建工学院,水质科学与水环境恢复工程北京市重点实验室,北京100124 [3]山东建筑大学市政与环境工程学院,济南250101

出　　处：《环境科学》2011年第6期1660-1664,共5页Environmental Science

基　　金：国家自然科学基金项目(50808002);北京市科技新星计划项目(2008B11)

摘　　要：采用SBR反应器,以甲醇为碳源,研究了污水反硝化过程中的亚硝酸盐积累现象.在试验温度为14℃,初始pH值为7.33,污泥浓度为1 000 mg.L-1条件下,反硝化过程中出现了明显的亚硝酸盐积累,亚硝酸盐浓度随着硝酸盐的不断还原而逐渐增加,2.5 h时,硝酸盐基本消耗完毕,亚硝酸盐浓度达到最大值22.35 mg.L-1,亚硝酸盐积累率(生成的NO 2--N/初始NO 3--N)为43.2%,在此过程中,pH值开始缓慢上升,至2.67 h达到7.79.随后,亚硝酸盐浓度开始逐渐下降,并最终消耗完毕,在此过程中,pH值开始快速上升,并在硝酸盐消耗完毕时形成了一个明显的拐点,因而可作为硝酸盐耗尽的指示参数,至3.5 h时pH达到最大值8.35,最后略有下降.产生亚硝酸盐积累的原因是系统中硝酸盐的存在抑制了亚硝酸盐的还原,导致硝酸盐还原速率大于亚硝酸盐还原速率.Characteristics of nitrite accumulation during denitrification process were studied by using methanol as the sole organic carbon in a batch-scale sequencing batch reactor with synthetic wastewater.Under the condition of temperature was 14℃,initial pH value was 7.33 and sludge concentration was 1 000 mg·L-1,nitrite accumulated significantly during denitrification process.Nitrite concentration increased gradually with nitrate reduction and reached its maximum value of 22.35 mg·L-1 in 2.5 h when nitrate reduction was almost completed,the amount of accumulated nitrite was equivalent to 43.2% of the amount of initial nitrate.During this period,pH value gradually increased to 7.79 in 2.67 h.Then accumulated nitrite kept decreasing until to zero.When the concentration of nitrate reduced to zero,the increasing rate of pH rise dramatically,formed a breakpoint of pH curve.Therefore,the breakpoint of pH curve can be used as an indicator to show the end of nitrate reductive reaction.The pH value reached its maximum value of 8.35 in 3.5 h and decreased a little afterward.The reason for the accumulation of nitrite is the inhibition of nitrate on nitrite reductive reaction,caused the reductive rate of nitrate was more than that of nitrite.

关 键 词：亚硝酸盐积累 反硝化 甲醇 污水处理 厌氧氨氧化 

分 类 号：X701.3[环境科学与工程—环境工程]