摘要
研究了在控制温度为80℃、加热时间为30 min时不同p H值的热碱预处理对餐厨垃圾中温（35℃）单相厌氧发酵产挥发性脂肪酸（VFA）的影响。考察了热碱预处理p H值为8.0、9.0、10.0、11.0和12.0条件下的VFA浓度及组成情况。结果表明,热碱预处理p H值对餐厨垃圾厌氧发酵过程中VFA浓度及组成均有显著影响。p H10.0、p H 11.0和p H 12.0处理的总VFA以及丙酸和丁酸含量均高于p H 8.0和p H 9.0处理。在120 h厌氧发酵时间内,各处理VFA组成中乙酸和丁酸含量明显高于丙酸和戊酸,且乙酸和丁酸合计占总VFA的比例变幅为62.02%~82.08%,为典型的丁酸型发酵。p H 11.0处理发酵液中VFA浓度最大;至120 h反应结束时,其VFA浓度达60.14 g·L-1,比其他4个处理高6.14%~48.45%。可见,餐厨垃圾厌氧发酵产VFA的最佳热碱预处理p H值为11.0。
An experiment was carried out to explore effects of pretreatment of food waste with alkali at 80 ℃ for 30 minutes on production,concentration and composition of volatile fatty acid（ VFA） in the food waste under single phase anaerobic fermentation at 35 ℃ as affected by p H in the pretreatment. The experiment was designed to have five p H treatments,i.e. 8. 0,9. 0,10. 0,11. 0 and 12. 0. Results show that p H in the pretreatment significantly affected concentration and composition of the VFA produced in food waste under anaerobic fermentation. The content of total VFA,propionic acid and butyric acid in Treatments 10. 0,11. 0 and 12. 0,was higher than their respective ones in Treatments 8. 0 and 9. 0. During the 120 hours of anaerobic fermentation,contents of acetic acid and butyric acid are evidently higher than contents of pentanoic acid and propionic acid in terms of proportion in composition for all treatments; and the sum of acetic acid and butyric acid accounted for 62. 02%-82. 08% of the total VFA,indicating a typical butyric acid-type fermentation. VFA concentration was the highest in Treatment 11. 0,reaching up to 60. 14 g·L-1at the end of the 120-hour anaerobic fermentation and being 6. 14%-48. 45% higher than that in the other 4 treatments. Obviously p H 11. 0 is the optimal one for thermal alkaline pretreatment of food waste for VFA production via anaerobic fermentation.
出处
《生态与农村环境学报》
CAS
CSCD
北大核心
2015年第2期244-248,共5页
Journal of Ecology and Rural Environment
基金
中国矿业大学煤炭资源与安全开采国家重点实验室开放基金(SKLCRSM10KFA05)
安徽省高校省级自然科学研究项目(KJ2011B009)
国家自然科学基金(51274001)
关键词
热碱预处理
餐厨垃圾
厌氧发酵
挥发性脂肪酸
thermal alkaline pretreatment
food waste
anaerobic fermentation
volatile fatty acid（VFA）
