李倩1,
张念瑞1,
陈荣1
1.西安建筑科技大学环境与市政工程学院,西安 710055
基金项目: 国家自然科学基金资助项目(51608430)
中国博士后科学基金资助项目(2016M602781)
Effects of substrates components on kinetic characterization of co-digestion of food waste and waste activated sludge
XU Manjuan1,,LI Qian1,
ZHANG Nianrui1,
CHEN Rong1
1.School of Environmental & Municipal Engineering, Xi′an University of Architecture & Technology, Xi′an 710055,China
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摘要:通过厌氧发酵4阶段动力学实验、产甲烷抑制实验及单一VFA的产甲烷动力学实验,探明了厨余和污泥共发酵过程中,典型组分对其潜在的酸积累类型以及甲烷化过程的影响。结果表明,不同基质组分在厌氧发酵过程中的VFA组成比例以及单一VFA的产甲烷化动力学特性,对其产甲烷潜能及速率有着决定性影响。乙酸的甲烷化速率高达44.80 mL·d-1,丁酸略慢于乙酸,而丙酸和戊酸的甲烷化速率不足乙酸的1/2,其中丙酸的延滞期长达1.76 d。因此,产酸类型以乙酸为主的污泥、菜类在产甲烷阶段不存在延滞期；而蛋肉类及油的产甲烷速率受到丙酸、戊酸动力学特性的影响相对较慢。通过调整共发酵基质配比不仅能够提高发酵潜能,还能够优化VFA组成比例,实现较高的甲烷产率及甲烷化速率。
关键词: 中温厌氧发酵/
厨余/
污泥/
动力学特性/
挥发性脂肪酸
Abstract:The effects of substrate components on VFA accumulation and methane production during the co-digestion of food waste (FW) and waste activated sludge (WAS) were investigated by batch tests involving kinetic test of 4 stages of anaerobic digestion, methanogenesis inhibition test and kinetic test of methane production from individual VFA. Results showed that the composition of VFA which generated during anaerobic digestion of different substrate fraction and the kinetic characteristics of methanogensis of individual VFA affected the methane production potential and rate significantly. The methanogenesis rate of acetic acid was 44.80 mL·d-1, while, the methanogenesis rate of butyric acid was slightly lower than that of acetic acid. However, the methanogenesis rates of propionic acid and valeric acid were lower than half of that of acetic acid, and the lag time of propionic acid was as long as 1.76 d. Therefore, the methane production from WAS and vegetable of which acetate accounted for a large proportion showed no lag time. While, the methane production rate of the egg, meat and oil was affected by the kinetic characteristics of methanogenesis of propionic acid and velaric acid, thus it was relatively low. Co-digestion of FW and WAS could promote the potential of methane production, and achieve higher methane yield and production rate by optimizing the composition of generated VFA.
Key words:mesophilic anaerobic digestion/
food wastes/
waste activated sludge/
kinetic characterization/
volatile fatty acids.
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| [11] | 张玉静,蒋建国,王佳明,等.pH 值对餐厨垃圾厌氧发酵产挥发性脂肪酸的影响[J].中国环境科学,2013,33(4):680-684 |
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基质组分对厨余与污泥共发酵动力学特性的影响
许曼娟1,,李倩1,
张念瑞1,
陈荣1
1.西安建筑科技大学环境与市政工程学院,西安 710055
基金项目: 国家自然科学基金资助项目(51608430) 中国博士后科学基金资助项目(2016M602781)
关键词: 中温厌氧发酵/
厨余/
污泥/
动力学特性/
挥发性脂肪酸
摘要:通过厌氧发酵4阶段动力学实验、产甲烷抑制实验及单一VFA的产甲烷动力学实验,探明了厨余和污泥共发酵过程中,典型组分对其潜在的酸积累类型以及甲烷化过程的影响。结果表明,不同基质组分在厌氧发酵过程中的VFA组成比例以及单一VFA的产甲烷化动力学特性,对其产甲烷潜能及速率有着决定性影响。乙酸的甲烷化速率高达44.80 mL·d-1,丁酸略慢于乙酸,而丙酸和戊酸的甲烷化速率不足乙酸的1/2,其中丙酸的延滞期长达1.76 d。因此,产酸类型以乙酸为主的污泥、菜类在产甲烷阶段不存在延滞期；而蛋肉类及油的产甲烷速率受到丙酸、戊酸动力学特性的影响相对较慢。通过调整共发酵基质配比不仅能够提高发酵潜能,还能够优化VFA组成比例,实现较高的甲烷产率及甲烷化速率。
English Abstract
Effects of substrates components on kinetic characterization of co-digestion of food waste and waste activated sludge
XU Manjuan1,,LI Qian1,
ZHANG Nianrui1,
CHEN Rong1
1.School of Environmental & Municipal Engineering, Xi′an University of Architecture & Technology, Xi′an 710055,China
Keywords: mesophilic anaerobic digestion/
food wastes/
waste activated sludge/
kinetic characterization/
volatile fatty acids
Abstract:The effects of substrate components on VFA accumulation and methane production during the co-digestion of food waste (FW) and waste activated sludge (WAS) were investigated by batch tests involving kinetic test of 4 stages of anaerobic digestion, methanogenesis inhibition test and kinetic test of methane production from individual VFA. Results showed that the composition of VFA which generated during anaerobic digestion of different substrate fraction and the kinetic characteristics of methanogensis of individual VFA affected the methane production potential and rate significantly. The methanogenesis rate of acetic acid was 44.80 mL·d-1, while, the methanogenesis rate of butyric acid was slightly lower than that of acetic acid. However, the methanogenesis rates of propionic acid and valeric acid were lower than half of that of acetic acid, and the lag time of propionic acid was as long as 1.76 d. Therefore, the methane production from WAS and vegetable of which acetate accounted for a large proportion showed no lag time. While, the methane production rate of the egg, meat and oil was affected by the kinetic characteristics of methanogenesis of propionic acid and velaric acid, thus it was relatively low. Co-digestion of FW and WAS could promote the potential of methane production, and achieve higher methane yield and production rate by optimizing the composition of generated VFA.
