投加介体强化低温污水生物反硝化脱氮的研究

Enhanced Biological Denitrification of Low-temperature Sewage by Adding Redox Mediator

污水的生物脱氮效果易受低温条件抑制,通过投加介体可以提高脱氮效果。在(10±1)℃的低温条件下,研究了投加不同浓度的介体1,2-萘醌-4-磺酸(NQS)对生物反硝化脱氮的影响。结果表明,随着介体投加浓度的增加,介体对脱氮效果的强化作用先升高后下降,当介体投加浓度为200μmol/L时对生物脱氮的强化效果最佳,脱氮效率与速率均达到最大,分别为96.7%和31.9 mg NO_x^--N/(g VSS·h),相比空白试验[56.5%和12 mg NO_x^--N/(g VSS·h)]分别提高了1.7和2.7倍。

Nitrogen removal from sewage is inhibited by low temperature, but it can be improved by adding redox mediators. At low temperature of （ 10 ± 1 ） ℃,the effects of adding different concentra- tions of redox mediator 1,2-naphthoquinone-4-sulfonic acid （NQS） on biological denitrification were studied. The results showed that the enhancement of denitrification by adding redox mediator increased first and then decreased with the increasing of redox mediator concentration. When the redox mediator concentration was 200 μ mol/L, optimal denitrification was achieved, and the highest denitrification effi- ciency and denitrification rate reached 96.7% and 31.9 mgNOx- -N/（ gVSS·h） respectively, which increased by 1.7 times and 2.7 times compared with the blank test results [56.5% and 12 mgNOx- - N/ （gVSS· h） 3.