摘要
通过批式两相厌氧消化实验,考察了不同预处理方式对餐厨垃圾和接种污泥厌氧消化联产H2和CH4的影响。酸预处理、碱预处理和热预处理都能够提高酸化阶段H2体积分数和累计负荷产氢体积,酸预处理时分别达到27.58%和40.06 m L·g-1VS,比餐厨未预处理的提高了2.03倍和2.76倍。酸化发酵液的组成与餐厨垃圾的预处理方式相关。采用碱预处理后VFAs与餐厨未经预处理的区别不大。酸预处理和70℃热预处理后乙醇含量显著降低,主要以乙酸和丁酸为主,乙酸、丁酸质量浓度之和分别达到5426.27 mg·L-1和5622.06 mg·L-1。不同方式预处理后的酸化发酵液在产甲烷阶段的累计负荷产CH4体积为631.43 m L·g-1VS^669.26 m L·g-1VS。酸预处理餐厨的酸化发酵液产甲烷阶段累计负荷产甲烷体积最高,达到669.26 m L·g-1VS,比未预处理的提高了9.10%,高于70℃热预处理的。酸预处理餐厨的单位负荷氢气甲烷联产净能量收益最高,为24.37 k J·g-1VS,比未预处理的21.94 k J·g-1VS提高了11.08%。
Effect of different pretreatment of food waste and sluge on fermentative hydrogen and methane production in batch test were studied in this paper. Acid pretreatment, alkaline pretreatment and thermal pretreatment could increase the vol- ume fraction of H2 and cumulative H2 production during the acidification stage, the maximum reached 27.58% and 40. 06 mL · g^-1 VS respectively by acid pretreatmcnt, which was 2.03 times and 2.07 times more than those of non-pretreated group. The composition of acidified fermentation broth was related to the pretreatment method. The VFAs of food waste trea- ted with alkali had little difference with non-pretreatment group, while the alcohol content was reduced significantly after acid pretreatment and 70 ℃ thermal pretreatment. The acetic acid and butyric acid were the main contents and their total concentrations were 5426.27 mg ·L^-1 for acid pretreatment and 5622.06 mg·L^-1 for 70 ℃ thermal pretreatment. The cumulative methane production rate of acidified fermentation broth during the methane production stage were 631.43 mL ·g^-1 VS ～669.26 mL ·g^-1 VS for these three kind of pretreatment. And the highest cumulative methane production rate was 669.26 mL ·g^-1 VS obtained by acid pretreatment, which increased by 9.10% comparing with non-pretreatment. And so, the acid pretreatment gained the highest net energy from hydrogen and methane cogeneration, which was 24.37 kJ ·g^-1 VS, increased 11.08% than 21.94 kJ ·g^-1 VS by non-pretreated group.
出处
《中国沼气》
北大核心
2015年第2期13-18,共6页
China Biogas
基金
高等学校博士学科点专项科研基金(20120010110004)
北京市自然科学基金(8142030)
中央高校基本科研业务费(ZY1301
JD1303)
关键词
餐厨垃圾
厌氧消化
联产
预处理
food waste
anaerobic digestion
cogeneration
pretreatment
