Journal
INTERNATIONAL BIODETERIORATION & BIODEGRADATION
Volume 129, Issue -, Pages 170-178Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ibiod.2018.02.008
Keywords
Waste activated sludge; Pretreatment; Fermentation; Volatile fatty acids; Dewaterability; Large-scale project
Funding
- National Natural Science Foundation of China [51678280]
- Ministry of Science and Technology [2014BAD24B03-02]
- Fundamental Research Funds for the Central Universities [JUSRP51633B]
- Postgraduate Research & Practice Innovation Program of Jiangsu Province [SJCX17-0499]
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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 (7.48 +/- 0.64 g VFAs/L) and thermo-CaO2 (7.91 +/- 0.56 g VFAs/L) were proved to be better than that with thermo-mixed alkali (6.93 +/- 0.63 g VFAs/L). Sludge pretreated with thereto-CaO2 presented the best dewaterability and the moisture content of the sludge cake could be reduced to as low as 63.4 +/- 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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