Using porphyritic andesite as a new additive for improving hydrolysis and acidogenesis of solid organic wastes |
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| Authors: | Dawei Li Tao Zhou Ling Chen Weizhong Jiang Fan Cheng Baoming Li Yutaka Kitamura |
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| Institution: | 1. Key Laboratory of Agricultural Engineering in Structure and Environment, Ministry of Agriculture, China Agricultural University, Qinghua Donglu 17, Beijing 100083, China;2. Center of Energy Conservation and Environmental Protection, Beijing Municipal Commission of Development and Reform, Beijing 100029, China;3. Institute of Energy and Environmental Protection, Chinese Academy of Agricultural Engineering, Maizidian 41, Beijing 100125, China;4. Graduate School of Life and Environmental Sciences, University of Tsukuba, Ibaraka 305-8572, Japan |
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| Abstract: | The effects of porphyritic andesite on the hydrolysis and acidogenesis of solid organic wastes were investigated by batch and continuous experiments using a rotational drum fermentation system. The results of the batch experiment show that if porphyritic andesite (1%, 3%, and 5% reactants) is added initially, the pH level increases and hydrolysis and acidogenesis are accelerated. The highest surface based hydrolysis constant (26.4 × 10−3 kg m−2 d−1) and volatile solid degradation ratio (43.3%) were obtained at a 1% porphyritic andesite addition. In the continuous experiment, porphyritic andesite elevated the first order hydrolysis constant from 13.10 × 10−3 d−1 to 18.82 × 10−3 d−1. A particle mean diameter reduction rate of 33.05 μm/d and a volatile solid degradation rate of 3.53 g/L d−1 were obtained under the hydraulic retention time of 4, 8, 12 and 16 d. |
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| Keywords: | Porphyritic andesite Hydrolysis Acidogenesis Solid organic wastes Rotational drum fermentation system |
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