COMPREHENSIVE INFLUENCE OF MULTIPLE FACTORS ON HYDROGEN PRODUCTION FROM COMBINED ANAEROBIC FERMENTATION OF SLUDGE AND KITCHEN WASTE UNDER MEDIUM TEMPERATURE CONDITION
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摘要: 污泥与餐厨垃圾联合厌氧发酵产H2既可减少环境污染,又可制备清洁能源,是一种理想的有机固废处理处置技术。通过4因素5水平正交设计的批式实验及产氢动力学,探究餐厨垃圾C/N、混合体系C/N、含水率、初始pH值4个主要因素共同作用对中温条件下污泥餐厨垃圾联合厌氧发酵产H2的影响。极差与方差分析结果表明:4个主要因素对联合厌氧发酵产H2结果影响较明显,而餐厨垃圾C/N和混合体系C/N的交互作用对产H2结果的影响不显著。不考虑交互作用,以比氢气产量为产H2效能主要表征指标,最终确定餐厨垃圾C/N 为20,联合发酵体系C/N为 10,初始pH值为7,含水率为90%时,产H2效能最佳,此时的累积产氢量为1499.6 mL,比氢气产量为140.96 mL H2/g DS,最大产氢速率为21.73 mL H2/h,最大H2浓度为55.79%。Abstract: The combined anaerobic fermentation of sludge and kitchen waste under medium temperature to produce hydrogen is an ideal treatment and disposal technology for both reducing environmental pollution and generating clean energy. Through batch experiment with four factors and a five-level orthogonal design, the effects of four main factors, including kitchen waste C/N, system C/N, moisture content and initial pH value on the hydrogen production from the combined anaerobic fermentation of sludge and kitchen waste based on the hydrogen production performance, and the key factors optimization of conditions were studied under medium temperature condition. The analysis of range and variance showed that the four main factors had an obvious effect on hydrogen production performance, but neither did the interaction of kitchen waste C/N and system C/N. Meanwhile, ignoring the interaction effect, the optimal operational conditions obtained by orthogonal design with the maximum specific hydrogen yield as the dominant indication of biohydrogen performance were: a kitchen waste C/N of 20, combined anaerobic fermentation system C/N of 10, initial pH of 7 and moisture content of 90%, and the corresponding cumulative hydrogen production, specific hydrogen yield, maximum hydrogen production rate and maximum hydrogen concentration was 1499.6 mL, 140.96 mL H2/g DS, 21.73 mL H2/h and 55.79%, respectively.
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Key words:
- sludge /
- kitchen waste /
- combined anaerobic fermentation /
- orthogonal experiment /
- hydrogen production /
- optimization
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