HAN Mei-ling,ZHU Fen-fen,ZHANG Rong-yan,et al.Comparison of Two Sewage Sludge Low Temperature Drying Methods[J].China Water & Wastewater,2020,36(17 17):57-61.
Comparison of Two Sewage Sludge Low Temperature Drying Methods
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第36卷
Number:
17 17
Page:
57-61
Column:
Date of publication:
2020-09-01
- Abstract:
- Sewage sludge contains abundant organic matters. Lipid in the sludge can be extracted by Soxhlet extraction method and ultrasonic extraction method. Meanwhile, it is also found that this process could simultaneously reduce the moisture content of the sludge residue and achieve the effect of low-temperature drying of the sludge. The optimal reaction conditions of Soxhlet extraction and ultrasonic extraction were explored from different perspectives. The optimal reaction conditions of Soxhlet extraction method were as follows: volume ratio of n-hexane and ethanol of 1 ∶1, solid-liquid ratio of 1 ∶20, extraction temperature of 75 ℃, and extraction time of 8 hours. Under the above conditions, the extraction rate of lipid was up to 22%, and the moisture content of the sludge residue was reduced to 5%-10%. The optimal extraction conditions of ultrasonic extraction method were as follows: power density of 0.2 W/cm3, solidliquid ratio of 1 ∶20, extraction time of 30 min, and extraction temperature of 50 ℃. Under the optimal extraction conditions, the extraction rate of lipid could reach 22%, and the moisture content of the sludge residue could be reduced to 50%-60%.
Last Update:
2020-09-01