SHIZu-hui,YEXin-tong,ZHANGYan,et al.Application of Sludge Digestion and Drying Technology in Zhengzhou New District WWTP[J].China Water & Wastewater,2024,40(16):116-120.
Application of Sludge Digestion and Drying Technology in Zhengzhou New District WWTP
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第40卷
Number:
第16期
Page:
116-120
Column:
Date of publication:
2024-08-17
- Keywords:
- Zhengzhou New District wastewater treatment plant; sludge digestion and drying; anaerobic digestion; biogas
- Abstract:
- The sludge treatment process of Zhengzhou New District wastewater treatment plant(WWTP) includes thickening, dewatering, digestion and drying. The sludge digestion capacity is 200 tDS/d and the drying capacity is 300 t/d (80% sludge water content), which have been running stably with high gas production rate since its completion. According to the function orientation, the system is divided into 3 major systems, such as sludge treatment, biogas utilization and heat recovery system. After anaerobic digestion of sludge, biogas is produced, and the heat energy obtained from the combustion of biogas is used to dry the remaining sludge after digestion. The high-temperature exhaust gas produced by drying is used to provide the energy needed to maintain the anaerobic temperature through heat recovery. The final dried sludge with less than 30% water content is obtained and shipped out for disposal and utilization, achieving the energy balance of the system and contributing to carbon emission reduction.
Last Update:
2024-08-17