Enhancement for anaerobic digestion of sewage sludge pretreated by microwave and its combined processes

To improve anaerobic digestion and dewatering of sludge, impacts of sludge pretreated by microwave (MW) and its combined processes on sludge anaerobic digestion and dewatering were investigated. The results showed that microwave and its combined processes could effectively enhance anaerobic sludge d...

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Bibliographic Details
Published inHuanjing kexue Vol. 35; no. 9; p. 3455
Main Authors Liu, Ji-bao, Ni, Xiao-tang, Wei, Yuan-song, Tong, Juan, Wang, Ya-wei
Format Journal Article
LanguageChinese
Published China 01.09.2014
Subjects
Biodegradation, Environmental
Hydrogen Peroxide - chemistry
Methane - chemistry
Microwaves
Particle Size
Sewage
Waste Disposal, Fluid - methods
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Summary:To improve anaerobic digestion and dewatering of sludge, impacts of sludge pretreated by microwave (MW) and its combined processes on sludge anaerobic digestion and dewatering were investigated. The results showed that microwave and its combined processes could effectively enhance anaerobic sludge digestion. Not only the cumulative methane production in the test of the MW-H2O2-alkaline (0. 2) was increased by 13. 34% compared with the control, but also its methane production rate was much higher than that of the control. Compared with the single MW process, the addition of both H2O2 and alkaline enhanced the solubilization of particle COD( >0. 45 micron) , indicating that synergistically generated soluble organics were faster to biodegrade which resulted in the enhancement of anaerobic digestion. The MW-acid process was effective in improving sludge dewaterability, e. g. , Capillary Suction Time (CST) at only 9. 85 s. The improvement of sludge dewatering was significantly correlated with sludge physical prope
ISSN:0250-3301
DOI:10.13227/j.hjkx.2014.09.029