ALKALINE-THERMAL HYDROLYSIS OF SEWAGE SLUDGE DIGESTATE AND ITS PERFORMANCE IN ANAEROBIC FERMENTATION

LIU Baocun; ZHOU Jiti; JIN Ruofei; TIAN Tian; CUI Tiantian

doi:10.13205/j.hjgc.202309020

Volume 41 Issue 9

Sep. 2023

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2023 > 41(9): 166-173

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LIU Baocun, ZHOU Jiti, JIN Ruofei, TIAN Tian, CUI Tiantian. ALKALINE-THERMAL HYDROLYSIS OF SEWAGE SLUDGE DIGESTATE AND ITS PERFORMANCE IN ANAEROBIC FERMENTATION[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(9): 166-173. doi: 10.13205/j.hjgc.202309020

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ALKALINE-THERMAL HYDROLYSIS OF SEWAGE SLUDGE DIGESTATE AND ITS PERFORMANCE IN ANAEROBIC FERMENTATION

doi: 10.13205/j.hjgc.202309020

Key Laboratory of Industrial Ecology and Environmental Engineering, MOE, Dalian University of Technology, Dalian 116024, China

Received Date: 2023-04-06
Available Online: 2023-11-15

Abstract

Abstract

To recover and reuse the organic matter in sewage sludge digestate, this work adopted alkaline-thermal hydrolysis to treat the digestate, exploring the effects of different conditions on its disintegration and organics dissolution efficiency. The optimal conditions for alkaline-thermal hydrolysis of sewage sludge digestate were determined as pH=13, T=80℃, and t=8 h. Under these conditions, the disintegration efficiency of sewage sludge digestate achieved 40.9%, with the dissolution efficiency of COD, protein, and polysaccharide of 722.2, 79.7, and 73.7 mg/g VSS, respectively. The sewage sludge digestate after alkaline-thermal hydrolysis was used as substrates for anaerobic fermentation to produce methane. The effect of initial pH on anaerobic fermentation was further investigated. It was found that the best methane yield was achieved at the initial pH of 13, and the COD removal efficiency was 61.1% with a methane yield of 65.0 mL/g VSS and a methane proportion of 81.0% in the produced biogas. This work confirms that alkaline-thermal hydrolysis can improve the biodegradability of sewage sludge digestate, and its potential in producing methane through anaerobic fermentation.
- sewage sludge digestate,
- alkaline-thermal hydrolysis,
- dissolution efficiency,
- anaerobic digestion,
- methane yield

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References

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