NaHSO_(3)活化KMnO_(4)氧化去除水中嗅味物质的优化控制

Performance optimization of permanganate/bisulfite process for removing odor compounds in water

二甲基异莰醇(2-MIB)和土臭素(GSM)等嗅味物质引起的饮用水嗅味问题是供水行业普遍关注的热点问题。围绕水中2-MIB和GSM的有效去除,研究了亚硫酸氢钠(BS)活化高锰酸钾(PM)对两种物质的氧化降解特性,优化了PM/BS体系的药剂投加方式,解析了常见水质因子对PM/BS体系去除2-MIB和GSM效果的影响。结果表明,PM/BS体系能有效氧化去除水中的2-MIB和GSM,但加药方式、药剂浓度比和PM投加量对氧化效果具有显著影响,多次投加比单次集中投加更有利于2-MIB和GSM的氧化去除,纯水条件下适宜的药剂浓度比和PM投加量分别为1∶5和50μmol/L,2-MIB和GSM去除率可分别达到96%和98%以上。水体pH与HCO_(3)^-对降解效果具有重要影响,pH为6.8的中性微偏酸性条件最有利于2-MIB和GSM的氧化去除;HCO_(3)^-升高会显著抑制PM/BS体系对2-MIB和GSM的氧化去除。水中Cl-浓度未对PM/BS体系氧化降解2-MIB和GSM的效能产生明显影响。实际原水条件下PM/BS体系对2-MIB和GSM的氧化去除效果减弱,但去除率仍能达到44.8%和56.7%,表现出较好的应用潜力。

Taste and odor problem caused by typical odorants such as 2-methylisoborneol(2-MIB)and geosmin(GSM)is an important topic of general concern in water supply industry.Aiming at effective removal of 2-MIB and GSM,the degradation characteristics of 2-MIB and GSM by permanganate/bisulfite(PM/BS)process and the dosing mode of PM/BS were studied.Meanwhile,the effects of common water quality factors on the degradation of 2-MIB and GSM by PM/BS process were investigated.The results showed that PM/BS process could effectively remove 2-MIB and GSM.However,the reactant dosing mode,reactant ratio and PM dosage had significant effects on the removal efficiencies.It was found that multiple-step dosing was more efficient than single-centralized dosing.The PM/BS ratio and PM dosage were optimized as 1∶5 and 50μmol/L,and the removal efficiencies of over 96%and 98%were achieved for 2-MIB and GSM in pure water condition,respectively.Bicarbonate and pH also exhibited significant influence on the removal of 2-MIB and GSM,the most favorable pH for PM/BS process was 6.8,and the increase of bicarbonate content could significantly inhibit the oxidative removal of 2-MIB and GSM.On the other hand,chloride ion had little effect on the removal of 2-MIB and GSM.Though removal of 2-MIB and GSM by PM/BS process were decreased in actual raw water,the removal efficiencies still reached to 44.8%and 56.7%,respectively,displaying good application potential for the PM/BS process.