XIAODong-jie,LIULi-zhu,LIFang-zhi.Analysis on Thermal Energy of a Sludge Treatment Project Adopting Thermal Hydrolysis and Anaerobic Digestion Process[J].China Water & Wastewater,2023,39(11):122-126.
Analysis on Thermal Energy of a Sludge Treatment Project Adopting Thermal Hydrolysis and Anaerobic Digestion Process
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第39卷
Number:
第11期
Page:
122-126
Column:
Date of publication:
2023-06-01
- Abstract:
- This paper collected the actual operational data of a municipal sludge centralized disposal project with process consisting of thermal hydrolysis, high temperature anaerobic digestion, plate frame dewatering and belt drying in a natural year, such as the quality of sludge, biogas yield and thermal energy consumption of each section, and analyzed the variation of sludge quality and the thermal energy balance under different operational modes. The organic matter and solid content of the sludge changed seasonally. When the sludge with organic matter content of 30%-46.16% was treated in the whole process chain, biogas with volume of 19-92 m3 should be added to treat each ton of dry sludge (DS), so that the project could achieve thermal energy balance. When the belt drying was not operated, the organic matter content of the sludge should be higher than 36.88% to achieve the thermal energy balance of the system. The ash-cleaning outside the season of high humidity effectively avoided the short?term reduction of boiler thermal efficiency caused by ash accumulation on boiler heating surface and prevented the overall corrosion of heating surface caused by moisture regain of accumulated ash.
Last Update:
2023-06-01