JINYi-xin,PANXiao-yue,HUANGJian-nan,et al.Research on Sludge Yield and Output of Municipal Wastewater Treatment Plant in a Coastal City of Southern Fujian[J].China Water & Wastewater,2024,40(22):40-46.
Research on Sludge Yield and Output of Municipal Wastewater Treatment Plant in a Coastal City of Southern Fujian
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第40卷
Number:
第22期
Page:
40-46
Column:
Date of publication:
2024-11-17
- Keywords:
- sewage treatment plant; sludge yield; sludge production; improvement of sewage quality and efficiency
- Abstract:
- In order to scientifically predict the sludge output, and help to form a complete harmless and resource-based sludge treatment system with complete facilities and safe operation, the empirical influencing factors and the development trend of sludge yield of 29 urban sewage treatment plants in a coastal city in southern Fujian were systematically studied. The 29 WWTPs have a total capacity of 123×104 m3/d, and the treatment process includes (improved) oxidation ditch, AO or AAO, CASS, etc.. With the improvement of sewage treatment quality and efficiency, the experienced sludge yield of the city increased from 1.11 tDS/104 m3 in 2020 to 1.25 tDS/104 m3 in 2021, which, however, remained slightly lower than the national average (1.62 tDS/104 m3). The relationship between sludge yield and influent BOD5 and temperature is not significant, which is mainly due to the regional characteristics of southern Fujian. Sludge yield of medium-scale sewage treatment plants using (improved) oxidation ditch process is the highest in the central part, and the sludge yield of medium-sized sewage treatment plants is generally higher than that of small-and large-scale sewage treatment plants. Though developing trends indicated a slight increase in average sludge yield yearly, it might be lower than that of the northern city in the long-term considering the regional characteristics of southern Fujian. It is suggested that the plan & design of sludge treatment facilities in similar areas should focus on the demands of large-and medium-scale sewage treatment plants, and fully reserve enough buffer space for various factors, including improvement of sewage treatment quality and efficiency, interception of initial rainwater, and upgrading and reconstruction of effluent, so as to response resiliently to shocks of climate change and rainfall, plan in uniformity and implement in stages. At the same time, it is suggested that the sludge requirements of the sewage treatment plant should be unified, which is conducive to the stable operation of the sludge treatment and disposal system.
Last Update:
2024-11-17