【摘要】：BrO_3~-(溴酸鹽)作為飲用水中存在的2B級潛在致癌物已引起社會公眾的廣泛關注.微生物還原降解是一種凈化水中BrO_3~-的有效途徑.基于序批式試驗,研究了厭氧條件下微生物利用氫氣作為電子供體還原降解水中BrO_3~-的可行性及關鍵影響因素.結果表明,氫自養(yǎng)微生物能利用氫氣為電子供體、BrO_3~-為電子受體,將BrO_3~-完全還原成一種穩(wěn)定的無毒的終產物Br~-.在120 h的反應期內,ρ(BrO_3~-)從初始時的1.02 mg/L降至0.56 mg/L(去除率為44.5%),最高去除速率達0.26 mg/(L·d),出水ρ(Br~-)相應地升至0.29 mg/L.對照處理中,ρ(BrO_3~-)和ρ(Br~-)均沒有明顯的降低和升高趨勢.影響因素試驗表明,NO_3~--N和SO_4~(2-)作為常規(guī)氧化性污染物(電子受體),反硝化和SO_4~(2-)還原對BrO_3~-還原耗氫產生了競爭,致使BrO_3~-生物還原過程受到電子供體的競爭性抑制.反硝化對BrO_3~-還原效率的影響程度比SO_4~(2-)還原更加強烈.初始ρ(BrO_3~-)對氫自養(yǎng)微生物還原降解BrO_3~-效率有較大影響.氫自養(yǎng)微生物還原降解BrO_3~-最適宜的pH范圍處于7.0~7.5之間.研究顯示,利用氫氣作為電子供體的氫自養(yǎng)微生物將BrO_3~-還原成無毒的Br~-是一種較為可行的生物處理技術或手段.
[Abstract]:BrO_3~-(bromate) as a potential carcinogen of class 2B in drinking water has attracted wide public attention. Microbial reduction degradation is an effective way to purify BrO_3~ - in drinking water. Based on sequencing batch experiments, the feasibility and key of microbial reduction of BrO_3~ - in drinking water by hydrogen as an electron donor under anaerobic conditions were studied. The results showed that autotrophic hydrogen microorganisms could use hydrogen as electron donor and BrO_3~ - as electron acceptor to completely reduce BrO_3~ - to a stable and non-toxic end product Br ~-. During the 120 h reaction period, the BrO_3~-) decreased from 1.02 mg/L at the beginning to 0.56 mg/L (the removal rate was 44.5%) with the highest removal rate of 0.26 mg/L (d) and the effluent of 0.26 mg/L D. (Br~-) increased to 0.29 mg/L correspondingly. In the control treatment, there was no obvious trend of decrease and increase of P (BrO_3~-) and P (Br~-). Influencing factors test showed that NO_3~--N and SO_4~ (2-) as conventional oxidative pollutants (electron acceptors), denitrification and SO_4~ (2-) reduction competed for hydrogen consumption of BrO_3~ - reduction, resulting in BrO_3~ - biological reduction process suffered. The effect of denitrification on the reduction efficiency of BrO_3 ~ - is stronger than that of SO_4 ~ (2 -). Initial Rho (BrO_3 ~-) has a greater effect on the reduction efficiency of BrO_3 ~ - by hydrogen autotrophic microorganisms. The optimum pH range for the reduction of BrO_3 ~ - by hydrogen autotrophic microorganisms is between 7.0 and 7.5. Reduction of BrO_3~ - to non-toxic Br~ - by electron donor autotrophic microorganisms is a feasible biological treatment technology or means.
【作者單位】： 桂林理工大學環(huán)境科學與工程學院廣西環(huán)境污染控制理論與技術重點實驗室;桂林理工大學巖溶地區(qū)水污染控制與用水安全保障協(xié)同創(chuàng)新中心;同濟大學環(huán)境科學與工程學院污染控制與資源化研究國家重點實驗室;
【基金】：國家自然科學基金項目(51408146) 廣西自然科學基金項目(2016GXNSFAA380204;2016GXNSFBA380207)
【分類號】：TU991.2
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本文編號：2222925