WEIShang-hui,XUHeng,CHANGFeng-min,et al.Performance of Enhanced Membrane Coagulation for Rural Domestic Sewage Treatment and Its Sludge Resource Utilization Potential[J].China Water & Wastewater,2022,38(9):1-7.
Performance of Enhanced Membrane Coagulation for Rural Domestic Sewage Treatment and Its Sludge Resource Utilization Potential
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第38卷
Number:
第9期
Page:
1-7
Column:
Date of publication:
2022-05-01
- Keywords:
- rural domestic sewage; enhanced membrane coagulation; sludge; carbon and phosphorus recovery; acid/base pretreatment; acidified fermentation
- Abstract:
- In recent years, the local treatment of rural domestic sewage and its sludge utilization has been widely concerned. Compared with biological processes, the enhanced membrane coagulation technology can rapidly capture carbon and phosphorus resources in sewage, and has been demonstrated in domestic sewage treatment in rural areas of Beijing. Therefore, performance of the demonstration project based on enhanced membrane coagulation technology was analyzed, and the recovery of carbon and phosphorus from the membrane coagulation sludge was investigated. The enhanced membrane coagulation integrated device removed more than 80% of COD and TP when the hydraulic retention time was 60 min, and produced sludge rich in carbon and phosphorus with good resource utilization potential. Acid/base pretreatment effectively enhanced the hydrolysis of sludge, promoted the simultaneous release of organic matter and phosphate from the sludge (especially in alkaline condition), and their highest concentrations were 5 214.5 mg/L and 122 mg/L, respectively. Acidified fermentation is one of the important ways to realize further conversion and utilization of organic matter. When the initial pH of the sludge was adjusted to 11, the best acidification fermentation performance was obtained: the acidification product yield reached 3 419.6 mg/L, and the acidification rate was up to 77.0%. The combined technology of enhanced membrane coagulation, acid/base pretreatment of sludge and acidified fermentation is expected to promote the recovery of carbon and phosphorus resources from rural domestic sewage. However, the subsequent utilization method and potential risks need to be further investigated.
Last Update:
2022-05-01