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.
農(nóng)村生活污水強化膜混凝性能及其污泥資源化潛力
- Title:
- Performance of Enhanced Membrane Coagulation for Rural Domestic Sewage Treatment and Its Sludge Resource Utilization Potential
- Keywords:
- rural domestic sewage; enhanced membrane coagulation; sludge; carbon and phosphorus recovery; acid/base pretreatment; acidified fermentation
摘要:- 農(nóng)村生活污水和污泥的就地處理與資源化利用近年來受到廣泛關(guān)注，與生物法相比，強化膜混凝技術(shù)能快速捕獲污水中的碳、磷資源，目前已在北京農(nóng)村地區(qū)的生活污水處理中得到示范應(yīng)用。為此，分析了強化膜混凝技術(shù)的示范應(yīng)用效果，并以其產(chǎn)生的污泥為研究對象，考察了污泥中碳、磷的回收性能。結(jié)果表明，強化膜混凝一體化示范設(shè)備能在水力停留時間為60 min的條件下實現(xiàn)80%以上COD和TP的去除，并產(chǎn)生富含碳、磷且具有較好資源化潛力的污泥。酸堿預(yù)處理能有效強化污泥水解，尤其是堿性條件能促進污泥中有機物和磷酸鹽的同步釋放，最高濃度分別達到5 214.5 mg/L和122 mg/L。酸化發(fā)酵是實現(xiàn)有機物進一步轉(zhuǎn)化利用的重要途徑之一，當污泥初始pH調(diào)為11時，酸化發(fā)酵效果最優(yōu)，酸化產(chǎn)物產(chǎn)量達到3 419.6 mg/L（以COD計），酸化率高達77.0%。“強化膜混凝+污泥酸堿預(yù)處理+酸化發(fā)酵”有望促進農(nóng)村生活污水中碳、磷資源的回收，但其后續(xù)利用方式和潛在風(fēng)險需作進一步研究。
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.
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