Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8843834 | International Biodeterioration & Biodegradation | 2018 | 9 Pages |
Abstract
The effects of three kinds of waste activated sludge (WAS) thermo-chemical pretreatments, including thermo-NaOH, thermo-mixed alkali and thermo-CaO2 pretreatments, on volatile fatty acids (VFAs) production and sludge dewaterability were investigated in a large-scale WAS anaerobic fermentation project. Performances of VFAs production of sludge pretreated with thermo-NaOH (7.48â¯Â±â¯0.64â¯g VFAs/L) and thermo-CaO2 (7.91â¯Â±â¯0.56â¯g VFAs/L) were proved to be better than that with thermo-mixed alkali (6.93â¯Â±â¯0.63â¯g VFAs/L). Sludge pretreated with thermo-CaO2 presented the best dewaterability and the moisture content of the sludge cake could be reduced to as low as 63.4â¯Â±â¯4.4% after dewatering by plate-and-frame filter press. Conversely, the dewaterability of sludge pretreated with thermo-NaOH was significantly deteriorated and the VFAs were hard to be recovered. Furthermore, the economic feasibility comparison of thermo-NaOH, thermo-mixed alkali and thermo-CaO2 pretreatments for WAS anaerobic fermentation showed that the net profits were 1.55, 34.44 and 38.69 USD/ton dewatered sludge, respectively. Thermo-mixed alkali and thermo-CaO2 pretreatments are promising pretreatment methods for the wide application of WAS anaerobic fermentation.
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Authors
Lei Yu, Wenduo Zhang, He Liu, Ganghui Wang, Hongbo Liu,