Abstract:Effect of low gamma-ray doses ranging from 0 to 9.5kGy on sludge solubilization and hydrogen production was investigated to examine the potential utilization of irradiation technology in the fermentative hydrogen production by excess sludge. Experimental results showed that the solubilization efficiency of treated sludge from secondary sedimentation tank of a sewage treatment plant in Beijing was increased from 0 to 4% at irradiation doses from 0 to 9.5kGy. Certain soluble protein and polysaccharides were detected in the liquid supernatant, indicating that low dose irradiation is efficient to inhibit non-spore forming hydrogen-consuming microorganisms and to promote hydrogen production efficiency by spore germination in genus Clostridium correspondingly, which is known as one of the key hydrogen producers. Consequently, the enhancement of hydrogen production was obvious, the hydrogen production potential and hydrogen yield increased with increasing irradiation doses from 0 to 5kGy, and then decreased with further increasing irradiation doses from 5 to 9.5kGy. The maximum cumulative hydrogen production of 240mL/g glucose and maximum hydrogen yield of 1.93mol H2/mol glucose were all obtained at irradiation dose of 5kGy under 35℃ and initial pH 7.0in batch tests using glucose as substrate (1.0g/L). The modified Logistic model could describe the progress of cumulative hydrogen production in the batch tests of this study successfully, while modified Han-Levenspiel model could describe the effect of irradiation energies on average hydrogen production rate successfully.
王博, 王亮, 杨阳, 刘福东. g 辐照预处理促进剩余污泥发酵产氢的研究[J]. 中国环境科学, 2013, 33(12): 2201-2207.
WANG Bo, WANG Liang, YANG Yang, LIU Fu-Dong. Effect of γ-irradiation on fermentative hydrogen production by excess sludge. CHINA ENVIRONMENTAL SCIENCECE, 2013, 33(12): 2201-2207.