YANGGeng,ZHANGGui-quan,SUZhi,et al.Effect and Parameters Optimization of Subcritical Hydrothermal Method for Treatment of Municipal Sludge[J].China Water & Wastewater,2022,38(23):95-99.
Effect and Parameters Optimization of Subcritical Hydrothermal Method for Treatment of Municipal Sludge
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第38卷
Number:
第23期
Page:
95-99
Column:
Date of publication:
2022-12-01
- Keywords:
- subcritical hydrothermal reaction; municipal sludge; COD; ammonia nitrogen; hydropyrolysis
- Abstract:
- The performance of subcritical hydrothermal technology (including two steps of hydropyrolysis and oxidation) for treating municipal sludge was investigated, and the process parameters were optimized based on actual engineering operation. The municipal sludge with moisture content of 90% was pyrolyzed at 250 ℃ and 5 MPa for 1 h. After the treatment, the SCOD in sludge centrifugal effluent was 33 780 mg/L. Under the same reaction conditions, when the oxidation coefficient was controlled at 1.5 for 1 h, the COD removal rate of the sludge centrifugal effluent reached 91.62%, the ammonia nitrogen concentration was 212 mg/L, and the leaching toxicity of heavy metals met the national standards. The results indicated that the above process parameters were reasonable. After the treatment, the liquid part of the sludge could be sent to the municipal wastewater treatment plant for treatment and discharge after meeting the discharge standard, and the solid part could be directly utilized as resources or disposed by sanitary landfill.
Last Update:
2022-12-01