【摘要】：針對制約厭氧干發(fā)酵技術(shù)推廣應(yīng)用的傳質(zhì)限制、攪拌能耗高和產(chǎn)氣率低等瓶頸問題,文章提出了基于"周期性聚氣增壓,間歇性噴淋強(qiáng)化傳質(zhì)、定期快速釋氣泄壓"壓力調(diào)控的干發(fā)酵工藝。采用蔬菜廢棄物和蘆竹秸稈作為混合發(fā)酵原料進(jìn)行中溫發(fā)酵試驗(yàn),研究了壓力調(diào)控下干發(fā)酵的產(chǎn)氣效果,pH值的變化及原料降解的情況。結(jié)果表明:發(fā)酵底物濃度為15%時,壓力調(diào)控組的最大日產(chǎn)氣率為62.55 mL·g~(-1)VS,相對其對照組提高了29.64%;經(jīng)過50 d發(fā)酵后累積產(chǎn)氣率為820.47 mL·g~(-1)VS,是其對照組的2.09倍;pH值均在7.0~7.69之間波動,運(yùn)行良好,所產(chǎn)沼氣中CH_4含量高達(dá)79.12%;其纖維素降解率達(dá)30.2%,約為對照組的1.2倍。表明壓力調(diào)控可促進(jìn)干發(fā)酵直接產(chǎn)出CH_4含量較高的生物天然氣。
[Abstract]:In view of the bottleneck problems such as the restriction of mass transfer, high energy consumption and low gas production rate, which restrict the application of anaerobic dry fermentation technology, this paper puts forward a method based on "periodic gas pressurization and intermittent spray enhanced mass transfer". Periodic rapid release of air and pressure release "pressure regulation of dry fermentation process." The experiment of medium temperature fermentation with vegetable waste and asparagus straw was carried out. The effects of dry fermentation under pressure, the change of pH value and the degradation of raw materials were studied. The results showed that the maximum daily gas yield of the pressure control group was 62.55 mL g ~ (-1) VS, increased 29.64% compared with the control group when the fermentation substrate concentration was 15. After 50 days fermentation, the cumulative gas production rate of 820.47 mL g ~ (-1) VS, was 2.09 times of that of the control group, the pH values fluctuated between 7.0 and 7.69, and the CH_4 content in the biogas was as high as 79.12%. The degradation rate of cellulose reached 30.2 times, about 1.2 times of that of the control group. The results showed that pressure regulation could promote the direct production of natural gas with high CH_4 content by dry fermentation.
【作者單位】： 華北電力大學(xué)可再生能源學(xué)院生物質(zhì)發(fā)電成套設(shè)備國家重點(diǎn)實(shí)驗(yàn)室;
【基金】：風(fēng)能太陽能利用技術(shù)省部共建教育部重點(diǎn)實(shí)驗(yàn)室(內(nèi)蒙古工業(yè)大學(xué))開放基金資助項(xiàng)目(201501)
【分類號】：S216.4;X712

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