酸碱改性粉煤灰对SBR反应器处理氨氮废水的影响

Influence of Acid and Alkali Modified Fly Ash on Handling Ammonia Nitrogen Wastewater by SBR Reactor

利用1 mol/L盐酸和1 mol/L Na OH溶液对粉煤灰进行酸碱改性,将改性前后的粉煤灰加入处理模拟氨氮废水的SBR反应器中,反应器菌源来自于污水处理厂生化池活性污泥,逐渐提高进水NH+4-N质量浓度,检测反应器NH+4-N质量浓度及反应器中污泥质量浓度、优势菌群丰度.实验结果表明,当反应器运行40 d,进水NH+4-N质量浓度为861. 1 mg/L时,R3(添加经酸碱改性粉煤灰)反应器、R2(添加未改性粉煤灰)反应器、R1(未添加粉煤灰)反应器NH+4-N去除率分别为100%,98. 76%,91. 87%;利用蛋白质质量浓度间接表征三个反应器中的污泥质量浓度,R3反应器中蛋白质质量浓度最高为829. 08 mg/L,R2次之为789. 37mg/L,R1最小为154. 2 mg/L.此外,高通量测序结果显示R3反应器中硝化菌和亚硝化菌群丰度均高于R1,R2反应器中菌群丰度.

The fly ash was acid or alkali modified with 1 mol/L hydrochloric acid and 1 mol/L NaOH solution.The modified and non-modified fly ash were added into the SBR reactor for simulating the treatment of ammonia nitrogen wastewater.The bacteria in the reactor were taken from the activated sludge of a biochemical pool in a sewage treatment plant.The concentration of the influent NH4^+-N was increased gradually.Then,the concentration of NH4^+-N in the effluent of the reactor,the sludge concentration and the abundance of the dominant bacteria were all measured.The experimental results show that after the reactors has run for 40 days with an influent NH4^+-N concentration of 861.1 mg/L,the removal rate of NH4^+-N of R3 reactor(adding acid-base modified fly ash),R2 reactor(adding unmodified fly ash)and R1 reactor(without adding fly ash)are 100%,98.76%and 91.87%,respectively.If the concentration of sludge in the three reactors is indirectly characterized by protein concentration,the concentration of protein in the R3 reactor,R2 reactor and R1 reactor are 829.08 mg/L,789.37 mg/L and 154.2 mg/L,respectively.In addition,the high throughput sequencing results show that the abundance of nitrifying bacteria and nitrifying bacteria in R3 reactor is higher than that in R1 and R2 reactor.