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With the development of agricultural industrialization and the intensification of the livestock and poultry industry, agricultural waste emissions in China has increased year by year, agricultural waste emissions caused a serious waste of resources and environmental pollution, agricultural waste resources Utilization is the fundamental way to solve our current agricultural waste. Dry-fermentation with traditional wet fermentation compared to higher initial material solid holdup, the beginning of fermentation without adding water dilution, the product of the fermentation is completed without dehydration without biogas slurry secondary pollution of methane generated at the same time, solve agricultural waste pollution and the alleviation of rural energy crisis has a good prospect. This paper studied under laboratory conditions, the impact of different factors on the gas production rate of dry-fermentation of agricultural waste, which is dry-fermentation of agricultural waste research and development of the production process to provide a test basis. (1) respectively of cow dung, pig manure, corn stover as dry-fermentation of the raw materials in order to select a suitable fermentation feedstock The results show that: the cumulative gas production of the highest rates of cow dung as raw material fermentation test is 22.3L/kgTS, determine the cow dung to dry-fermentation main raw material, and adjust the solid holdup supplemented with corn stalks. (2), acids, alkalis, microorganisms Pretreatment of corn stover to reduce the lignin content, the results showed that: 4% NaOH solution lignin removal rate reached 62.1% 15.8% microbiological method lignin . Acid pretreatment, the pH value is not conducive to the growth of methanogenic bacteria, and the pre-treatment process is easy to produce a variety of harmful substances, so determining the microbiological method for the pretreatment of corn stover. (3) Study C / N ratio of 20, inoculation amount of the total solids (TS) content of 10%, under the conditions of 37 ± 1 ° C, the solids holdup, respectively 10, 20, 30, and 40% of the anaerobic fermentation of circumstances, the results show that: the cumulative gas production rate decreased with increasing solid holdup, the peak daily gas production rate decreased with increasing solid holdup. (4) Study C / N ratio of 25, inoculation amount of the total solids (TS) content of 10%, under the conditions of 37 ± 1 ° C, the solids holdup, respectively 10, 20, 30, and 40% of the anaerobic fermentation of circumstances, the results showed that: dry-fermentation (the solid holdup 20,30 and 40%) cumulative gas production were higher than the wet fermentation rate of 10% (solids), of which, 30 per cent of the solid holdup cumulative gas production rate highest, 20%, slightly lower than the lowest 40%; peak daily gas production rate decreased with increasing solid holdup. (5) to study the anaerobic fermentation of the C / N ratio of 25, inoculation amount of total solids (TS) content of 10%, under the conditions of 52 ± 1 ° C, the solids rates were 10, 20, 30, and 40% of the circumstances, the results show that: the cumulative gas production rate decreased with increasing solid holdup, the peak daily gas production rate decreased with increasing solid holdup. (6) the resulting biogas methane content in the study of different solid holdup The results show that: the methane content of the biogas with solid holdup increased.
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