基于DO和ORP的短程硝化SBR控制方法研究

对在污水处理过程中,短程硝化-反硝化面临着亚硝酸氧化菌(NOB)增殖导致系统运行问题,研究运行了一个短程硝化-反硝化序批式活性污泥反应器(SBR),以溶解氧(DO)含量和氧化还原电位(ORP)作为控制参数,利用控制系统调节好氧硝化和缺氧反硝化的反应时间,以实现氮的去除并抑制NOB的生长.结果表明,在实验条件下(温度29~30℃,pH为8~9,污泥停留时间14d),处理的高NH4^+-N含量(质量浓度500-750mg/L)的废水经过2个月的运行,成功地抑制了NOB的生长,并启动了短程硝化-反硝化SBR.SBR出水中NH4^+-N的质量浓度低于1mg/L,NO2^--N的积累率(NAR)维持在98%以上。

Study on the Control Method of Nitritation SBR Based on the DO and ORP

In order to solve the problem of nitrite oxidizing bacteria(NOB) proliferation during nitritation-denitrification process in wastewater treatment.A control method for ammonium oxidizing bacteria(AOB) improvement and NOB repression by adopting the signals of DO and ORP via nitritationdenitrification process in SBR was studied. The results showed that, under the controlled operation conditions(temperature of 29~30 ℃, p H of 8~9, SRT of14 d), a control system for lab-scale nitritation/denitrification SBR treating an ammonium rich synthetic wastewater(mass concentration of NH4+-N about 500~750 mg/L) was presented. During the two months of operation, the SBR demonstrated better performance in nitrogen removal and NOB inhibition during the whole operation period, specifically, NH4+-N was less than 1 mg/L in the effluent of SBR, and the nitrite accumulation rate(NAR) was more than 98%.