臭氧氧化烟气多种污染物协同脱除技术副产物亚硝酸盐的无害化处理  

Experimental research on harmless treatment for nitrites derived from multi-pollution absorption by ozone

作　　者：张明慧[1] 朱燕群[1] 马强[1] 徐超群[1] 周俊虎[1] 

机构地区：[1]浙江大学能源清洁利用国家重点实验室,浙江杭州310027

出　　处：《热力发电》2015年第6期42-46,共5页Thermal Power Generation

基　　金：国家重点基础研究发展计划(973计划)(2012CB214906);浙江省创新团队(2011R50017)

摘　　要：采用次氯酸钠氧化法对臭氧氧化烟气脱硫脱硝的副产物亚硝酸盐进行转化试验研究,得到了不同工况下亚硝酸盐的氧化反应特性.结果表明：在仅含 NO2－的溶液中加入等量次氯酸钠（NaClO）,亚硝酸盐氧化效率仅为60％~65％；氧化效率随着反应溶液 pH 值的降低而升高,弱酸性环境（pH＝5~7）中 NaClO 的氧化性最强；在25℃、溶液 pH 值为5~6的工况下, NaClO用量为理论需用量的1．1倍时,10 min 内可将 NaNO2完全氧化为 NaNO3,且过量的NaClO 可在24 h内完全分解.Based on the sodium hypochlorite oxidation method,the nitrite transformation experiments dur-ing multi-pollutants removal by ozone were carried out.The results indicated that the oxidation efficiency for the original solution containing nitrite anion was only 60% to 65% at the equivalent sodium hypochlo-rite.The oxidation efficiency increased with the decrease of solution pH value and reached its maximum in weak acidic environment（pH =5 ~7）.At 25 ℃ and with pH value of 5 ~ 6,the sodium nitrite was com-pletely transformed into sodium nitrate within 10 minutes at the equivalent ratio of 1.1.Moreover,the re-maining sodium hypochlorite could decompose thoroughly within 24 h.

关 键 词：烟气脱硫脱硝 氧化法 亚硝酸盐 pH 值 

分 类 号：TQ132.32[化学工程—无机化工]