碳源类型对SBR反硝化过程NO_2^--N累积的影响

Study on the Effect of Carbon Source on Nitrite-Nitrogen Accumulation in the Denitrification of the Biological Nitrogen Removal in Sequencing Batch Reactor(SBR)

以厌氧预处理的城市垃圾渗滤液为对象,采用序批式活性污泥法(SBR)反应器,通过向四个平行SBR反应器分别投加甲醇,乙醇,乙酸钠,丙酸钠和葡萄糖5种碳源,基于批次试验,考察了碳源类型对生物脱氮反硝化过程亚硝态氮(NO_2^--N)累积的影响.试验表明:除葡萄糖外,以甲醇,乙醇,乙酸钠和丙酸钠为碳源时,NO_2^--N均发生明显累积.在NO_2^--N积累段,以乙醇为碳源的NO_2^--N累积速率和硝态氮(NO_3^--N)还原速率最快,以甲醇和丙酸钠为碳源时NO_2^--N累积速率和NO_3^--N还原速率最慢.在NO_3^--N还原段,除葡萄糖外,4种碳源(甲醇,乙醇,乙酸钠和丙酸钠)均获得了彻底反硝化.

Nitrite-nitrogen accumulation during the denitrification of landfill leachate by anaerobic pretreatment was investigated. Experimental results clearly showecl treat mtrlte nnrogen accumu- lated during the denitrificaiton in the sequencing batch reactor （SBR） by using methanol, ethanol, sodium acetate, sodium propionate and glucose, respectively, as carbon sources. However, nitrate was not reduced and nitrite accumulation was not observed when using glucose as carbon sources. During nitrite accumulation phase of denitrification,nitrite accumulation rate and nitrate reduction rate using ethanol as carbon source were the fastest,while nitrite accumulation rate using metha- nol as carbon source and nitrate reduction rate using sodium propionate as carbon source were the slowest. When methanol, ethanol, sodium acetate and sodium propionate were used as carbon sources,respectively, nitrate was denitrified completely during the phase of nitrite reduction.