臭氧氧化破解污泥影响因素试验研究

Effects of Influencing Factors on Sludge Disintegration during Ozonation

采用自制的臭氧污泥接触反应柱,考察了不同污泥浓度和臭氧投加量下臭氧破解污泥的情况;分析了臭氧氧化破解污泥的直接和间接反应所占总破解反应的比率。试验结果表明,当臭氧进气质量浓度为31mg/L,初始污泥质量浓度为2000～6000mg/L时,臭氧破解污泥的效果较好,初始污泥浓度的变化对臭氧氧化破解污泥效果的影响较小。当初始污泥质量浓度为2300mg/L,臭氧进气质量浓度分别为7.44,13.0,31.2mg/L时,在相同的臭氧破解时间内,污泥破解率随臭氧投加量的增大而升高,臭氧投加量越大,对应的污泥破解率越高,臭氧进气浓度越低,则污泥达到破解完全所需时间越长。臭氧分解形成羟基自由基的间接反应对臭氧破解污泥的贡献率为73.5%,而臭氧直接反应的贡献率仅为26.5%。

A novel artificial sludge-ozone contactor was adopted to investigate effects from ozone dose on sludge disintegration rate and sludge characteristics. Sludge disintegration effects caused by indirect or direct ozonation were studied under certain experimental conditions, where inlet ozone concentration registered 31 mg/L, sludge samples ranged from 2 000 mg/L to 6 000 mg/L. Results indicated that sludge disintegration process very well and the impacts from sludge concentration appeared to be negligible, whiIe for sludge concentration registered 2 300 mg/L, ozone inlet concentration registered 7.44, 13.0, 31.2 mg/L respectively, sludge disintegration rate increased with the rise of ozone does, the same contact time holding the same. Results showed, the higher the inlet ozone level,the higher disintegration rate. While the inlet ozone concentration reduced, more contact time required to achieve fair disintegration results. Indirect reaction appeared to be the primary reason for sludge disintegration which accounting for 73.5 % sludge disintegration, while direct reaction only accounted for 26.5.