Goel R, Tokutomi T, Yasui H
Kurita Water Industries, Research and Development Center, 7-1, Wakamiya, Morinosato, Atsugi, Kanagawa, Japan 243-0124.
Water Sci Technol. 2003;47(12):207-14.
Source minimization of excess sludge production by economical means can be considered an attractive option to deal with the problem of sludge disposal under strict disposal standards. In this paper long-term operational results for a process that combines the oxidative ozone pretreatment with anaerobic sludge digestion are described. The ozone pretreatment solubilized around 19% and 37% of the solids at 0.015 and 0.05 gO3/gTS ozone dose. The solubilization ratios during ozonation did not show any significant difference for the sludge concentrations ranging from 1.8-2.6%. The TVS concentrations after ozone treatment were observed to be about 3% lower than the feed sludge concentrations suggesting only partial mineralization during ozonation. The ozone pretreatment resulted in improved solid reduction efficiencies during anaerobic digestion leading to higher methane recovery. The TVS removal efficiencies during anaerobic digestion were observed to increase by a maximum of 35-90% depending on the applied ozone dose during ozone pretreatment. The improvement in TVS degradation efficiency at different applied ozone doses correlated well with the extent of solubilization during ozonation. Long-term data also suggested that biomass acclimation to ozonated sludge was necessary before higher degradation efficiencies could be achieved.
通过经济手段实现剩余污泥产量的源头最小化，可以被视为在严格处置标准下解决污泥处置问题的一个有吸引力的选择。本文描述了一种将臭氧氧化预处理与厌氧污泥消化相结合的工艺的长期运行结果。在臭氧投加量为0.015和0.05 gO3/gTS时，臭氧预处理分别溶解了约19%和37%的固体。对于1.8 - 2.6%的污泥浓度范围，臭氧化过程中的溶解率没有显示出任何显著差异。观察到臭氧处理后的总挥发性固体（TVS）浓度比进料污泥浓度低约3%，这表明在臭氧化过程中只有部分矿化。臭氧预处理提高了厌氧消化过程中的固体减量效率，从而导致更高的甲烷回收率。观察到厌氧消化过程中的TVS去除效率根据臭氧预处理期间施加的臭氧剂量最多提高35 - 90%。不同臭氧剂量下TVS降解效率的提高与臭氧化过程中的溶解程度密切相关。长期数据还表明，在实现更高的降解效率之前，生物量适应臭氧处理后的污泥是必要的。
