Use of gamma-irradiation pretreatment for enhancement of anaerobic digestibility of sewage sludge |
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Authors: | Shoujun Yuan Zheng Zheng Yanyan Mu Xin Yu and Yongfu Zhao |
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Institution: | (1) School of Civil Engineering, Hefei University of Technology, Hefei, 230009, China;(2) State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210093, China;(3) Zhongan Zhihuan Technology Assessment Center, Beijing, 100022, China |
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Abstract: | The effects of γ-irradiation pretreatment on anaerobic digestibility of sewage sludge was investigated in this paper. Parameters
like solid components, soluble components, and biogas production of anaerobic digestion experiment for sewage sludge were
measured. The values of these parameters were compared before and after γ-irradiation pretreatment. Total solid (TS), volatile
solid (VS), suspended solid (SS), volatile suspended solid (VSS), and average floc size of samples decreased after γ-irradiation
treatment. Besides, floc size distribution of sewage sludge shifted from 80–100 μm to 0–40 μm after γ-irradiation treatment
at the doses from 0 to 30 kGy, which indicated the disintegration of sewage sludge. Moreover, microbe cells of sewage sludge
were ruptured by γ-irradiation treatment, which resulted in the release of cytoplasm and increase of soluble chemical oxygen
demand (SCOD). Both sludge disintegration and microbe cells rupture enhanced the subsequent anaerobic digestion process, which
was demonstrated by the increase of accumulated biogas production. Compared with digesters fed with none irradiated sludge,
the accumulated biogas production increased 44, 98, and 178 mL for digesters fed sludge irradiated at 2.48, 6.51, and 11.24
kGy, respectively. The results indicated that γ-irradiation pretreatment could effectively enhance anaerobic digestibility
of sewage sludge, and correspondingly, could accelerate hydrolysis process, shorten sludge retention time of sludge anaerobic
digestion process.
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Translated from Techniques and Equipment for Environmental Pollution Control, 2006, 7(8): 36–39 译自: 环境污染治理技术与设备] |
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Keywords: | γ -irradiation solid components ksoluble components anaerobic digestibility |
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