CAJ | 학술논문

为处理低碳氮比城市污水,在30～35℃、不调节pH值(7.01～8.33)的条件下,通过人为添加氨氮控制游离氨浓度(25 mg·L~(-1)),在SBR中6 d内成功启动了短程硝化反硝化.对比实验结果表明,短程硝化反硝化在处理低C/N比城市污水时的总氮脱除效果要优于传统的全程硝化反硝化,当反应器运行稳定后,溶解氧的浓度和高游离氨不再是影响NO_2~--N浓度累积的主要因素,NO_2~--N/NO_x~--N始终保持在80%以上.为了进一步提高短程硝化反硝化的脱氮效率,利用污泥厌氧水解产物替代10%进水,为反硝化阶段提供附加的部分碳源,两工艺联合后处理效果良好,出水TN平均浓度和去除率分别为13.39 mg·L~(-1)和74.9%,出水水质符合排放标准的要求.
위처리저탄담비성시오수,재30～35℃、불조절pH치(7.01～8.33)적조건하,통과인위첨가안담공제유리안농도(25 mg·L~(-1)),재SBR중6 d내성공계동료단정초화반초화.대비실험결과표명,단정초화반초화재처리저C/N비성시오수시적총담탈제효과요우우전통적전정초화반초화,당반응기운행은정후,용해양적농도화고유리안불재시영향NO_2~--N농도루적적주요인소,NO_2~--N/NO_x~--N시종보지재80%이상.위료진일보제고단정초화반초화적탈담효솔,이용오니염양수해산물체대10%진수,위반초화계단제공부가적부분탄원,량공예연합후처리효과량호,출수TN평균농도화거제솔분별위13.39 mg·L~(-1)화74.9%,출수수질부합배방표준적요구.
In order to achieve nitrogen removal in treating municipal wastewater with low C/N ratio, a shortcut nitrification-denitrification process was successfully developed in a sequencing batch reactor (SBR) in 6 days with the operation conditions of working at 30～35℃, without pH control (7.01～8.33) and maintaining a high concentration of free ammonia (FA, 25 mg·L~(-1)) by adding NH4+-N. The experiment results show that the total nitrogen removal efficiency of shortcut nitrification-denitrification is superior to that of the traditional nitrification-denitrification in treating municipal wastewater with low C/N ratio. It was also found that dissolved oxygen (DO) and FA do not affect accumulation of NO_2~--N when the operation is stabilized, and the NO_2~--N/NO_x~--N ratio could be maintained over 80%. In order to enhance the nitrogen removal efficiency of the shortcut nitrification-denitrification, 10% of SBR influent is replaced with the products of sludge anaerobic hydrolysis for supplying extra part of the carbon sources for denitrification. The total nitrogen removal efficiency of the combined process is 74.9%. The total nitrogen concentration in the effluent is 13.39 mg·L~(-1), which meets the quality requirement of the discharge standards.