LI Jin-he,ZHANG Bo-tao,LIU Bao-yu,et al.Optimal Reaction Temperature in Mesophilic Anaerobic Digestion of Waste Activated Sludge and Its Promotion Mechanism[J].China Water & Wastewater,2021,37(3):9-15.
污泥中溫厭氧消化最佳溫度及改善機理分析
- Title:
- Optimal Reaction Temperature in Mesophilic Anaerobic Digestion of Waste Activated Sludge and Its Promotion Mechanism
- 摘要:
- 我國市政污泥的中溫厭氧消化普遍存在有機物降解率低、消化速率慢及沼氣產量少等不足。為改善這種現(xiàn)狀，基于天津某污泥處理設施的泥質和運行工況，通過小試、中試和生產性試驗，考察了反應溫度對污泥消化過程中產氣量的影響，并對提高溫度促進厭氧消化的機理進行了分析。結果表明，在40 ℃和45 ℃下生物產甲烷勢（BMP）較35 ℃分別提高了28.4%和37.5%；在200 L中試水平上，穩(wěn)定期40 ℃日均產氣量比35 ℃增加25.5%，兩種溫度下沼氣中的甲烷含量基本相當；生產罐反應溫度升至40 ℃后，絕干有機物產甲烷量較往年同期提升近40%。40 ℃下污泥厭氧消化的溶解速率、水解速率和酸化速率分別較35 ℃提高73.3%、50.0%和34.7%，為后續(xù)的甲烷化提供了充足的底物。沒有接受過溫度馴化的污泥，40 ℃和35 ℃的甲烷生成速率幾乎相當，而對于經(jīng)過40 ℃馴化半年的污泥而言，不僅甲烷生成速率比35 ℃快20.5%，而且甲烷產量高12.2%。與其他厭氧消化改良工藝相比，該方法低廉、綠色與高效，具有推廣應用價值。
- Abstract:
- Mesophilic anaerobic digestion of waste activated sludge in China is hindered by low organic dry solids degradation efficiency, slow fermenting rate and restricted methanogenic production. In order to improve this situation, the impact of reaction temperature on methane (CH4) generation of anaerobic digestion based on a sludge treatment plan in Tianjin was assessed through lab-scale, pilot-scale and full-scale test. Also, the promotion mechanism of anaerobic CH4 production was investigated. The biochemical methane potential (BMP) at 40 ℃ and 45 ℃ increased by 28.4% and 37.5% respectively, compared with that at 35 ℃. The average CH4 generation in the experimental digester at 40 ℃ was 25.5% higher than that in the control digester at 35 ℃ during stabe period on 200-litre scale, and the methane content in biogas was equivalent at the two temperatures. After the reaction temperature of manufacturing digesters was adjusted from 35 ℃ to 40 ℃, an approximate 40% increase of CH4 yield (expressed as cumulative CH4 volume per volatile solid mass fed) was observed according to the running records of previous years. The mechanisms investigation for improved CH4 generation showed that the rates of solubilization, hydrolysis and acidification of waste activated sludge at 40 ℃ were accelerated by 73.3%, 50.0% and 34.7% respectively than those at 35 ℃, which was beneficial to providing more substrates for subsequent CH4 generation. It was found that the methanation process at 40 ℃ was almost the same as that at 35 ℃ for undomesticated activated sludge. For domesticated activated sludge at 40 ℃ lasted for half a year, it caused 20.5% higher of the methanogenesis rate and 12.2% higher of CH4 generation compared with the data at 35 ℃. As a more economical, environmental and efficient process, this approach possesses value of promotion and application.
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