ANAEROBIC DIGESTION OF SEWAGE SLUDGE BY A HIGH SOLID MESOPHILIC ANAEROBIC MEMBRANE BIOREACTOR

GUO Guang-ze; LI Ye-mei; ZHOU Shi-tong; LI Yu-you

doi:10.13205/j.hjgc.202107012

Volume 39 Issue 7

Jan. 2022

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2021 > 39(7): 101-107

GUO Guang-ze, LI Ye-mei, ZHOU Shi-tong, LI Yu-you. ANAEROBIC DIGESTION OF SEWAGE SLUDGE BY A HIGH SOLID MESOPHILIC ANAEROBIC MEMBRANE BIOREACTOR[J]. ENVIRONMENTAL ENGINEERING , 2021, 39(7): 101-107. doi: 10.13205/j.hjgc.202107012

Citation:

GUO Guang-ze, LI Ye-mei, ZHOU Shi-tong, LI Yu-you. ANAEROBIC DIGESTION OF SEWAGE SLUDGE BY A HIGH SOLID MESOPHILIC ANAEROBIC MEMBRANE BIOREACTOR[J]. ENVIRONMENTAL ENGINEERING , 2021, 39(7): 101-107. doi: 10.13205/j.hjgc.202107012

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ANAEROBIC DIGESTION OF SEWAGE SLUDGE BY A HIGH SOLID MESOPHILIC ANAEROBIC MEMBRANE BIOREACTOR

doi: 10.13205/j.hjgc.202107012

1. Department of Frontier Science for Advanced Environment, Graduate School of Environmental Sciences, Tohoku University, Sendai, Miyagi 980-8579, Japan;
2. Department of Civil and Environmental Engineering, Graduate School of Engineering, Tohoku University, Sendai, Miyagi 980-8579, Japan

Received Date: 2021-02-28
Available Online: 2022-01-18

Abstract

Abstract

Anaerobic digestion is accomplished in converting organic wastes such as sewage sludge into biogas, achieving waste reduction and resource recovery at the same time. However, conventional anaerobic digestion has the disadvantages of long HRT, poor effluent quality, high sensitivity to reactor pH, temperature and environmental conditions, etc. In this study, a high-solid anaerobic membrane bioreactor(AnMBR) with an effective volume of 15 L was applied for anaerobic digestion of sewage sludge(mixture of primary sludge and excess sludge). AnMBR is able to retain suspend solid(SS) in the reactor through efficient membrane filtration, which enhances the stability of the reactor operation and promotes the decomposition of organic matter. The AnMBR reactor realized stable operation under the conditions of 35℃, HRT 15 d, and organic load of 4.66 g-COD/(L·d) through a 155 days long-term operation experiment. During the experiment period, AnMBR was operating smoothly, ammonia nitrogen concentration was below the thresholdand and there was no volatile fatty acid accumulation. The biogas yield was 0.48 L/g-VS, and the average constitute of methane was 63.32%. The COD concentration in permeate was 0.77 g/L, and COD removal rate was as high as 98%. According to mass balance calculation, 54.38% of the total COD from the substrate was converted into methane, and only 0.6% remained in the effluent. In addition, this study achieved a continuous and stable working mode of 4 minutes of filtration and 1 minute of relaxation with average membrane flux of 9.6 L/(m²·h) under the condition of sludge concentration 25 g/L in the reactor. The calculation results of total membrane resistance showed that the total resistance was 11.87×10¹²/m. Cake layer attached to the membrane surface and the organic layer that causes the membrane pores blocking were the main factors of membrane fouling. This study investigated the feasibility of utilizing high-solid anaerobic membrane bioreactor in waste reduction and energy recovery through the performance of methane production and membrane filtration.
- sewage sludge,
- anaerobic digestion,
- AnMBR,
- membrane fouling

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References(31)

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