摘要
研究了餐厨垃圾分批厌氧消解过程中不同起始固含率(10%,12%和14%)和稀释率(0.25 d-1和0.33 d-1)对水解酸化过程pH值、垃圾消解、水解酸化液生产效率、脂肪酸组成和浓度等的影响。实验结果发现:以总固体去除率、单位质量垃圾累积COD溶出量(ACODm)和单位体积反应器累积COD溶出量(ACODv)等指标作为评价标准,起始固含率12%的体系具有较高的垃圾处理效率和反应器运行效率。与稀释率0.25 d-1的体系相比,稀释率0.33 d-1的体系在pH稳定性、总固体去除率和水解酸化液生产效率等方面具有明显的优势。所有体系中水解酸化产生的脂肪酸和醇均以乙酸、乙醇和丁酸为主,丙酸占总脂肪酸和醇的百分数在14.6%到17.1%之间,这种脂肪酸组成不会发生丙酸抑制,有利于后续产甲烷发酵的进行。
In present study, the effects of initial total solid （TS） concentrations（ 10% , 12% and 14% ） and dilution rates（0.25 d-1 and 0.33 d-1 ） on pH value, solid digestion, leachate production and fatty acid concentration and composition were investigated for hydrogenesis and acidogenesis of anaerobic digestion of kitch- en food waste in batch leachate-bed reactors. The percents of total solid removed, the cumulative dissolved COD per mass of waste （ACODm） and the cumulative dissolved COD per volume of reactor （ACODv） were compared for the systems with initial TS concentrations of 10% , 12% and 14% , the results show that the systems with ini- tial TS concentration of 12% have the appropriate digestion efficiency considering the waste digestion and the treating capacity of reactor. The systems with dilution rate（D） of 0.33 d 1 have clear advantages in pH value, solid digestion and leachate production in comparison with those with D of 0.25 d-1. Ethanol, acetate and buty- rate are the main products in acidogenesis. The concentrations of propionate in the total volatile fatty acids are in the range between 14.6% and 17.1% , which indicates that no propionate inhibition should occur in the following methanogenesis.
出处
《环境工程学报》
CAS
CSCD
北大核心
2009年第2期335-339,共5页
Chinese Journal of Environmental Engineering
基金
中国科学院青岛生物能源与过程研究所(筹)所长基金项目(31200871121003)
青岛市建委2005建设事业科技发展项目(青建发[2005]104)
国家自然科学基金面上项目(20877046)
国家自然科学基金青年科学基金项目(40806062)
关键词
餐厨垃圾
水解酸化
固含率
稀释率
kitchen food waste
hydrogencsis and acidogenesis
total solid concentration
dilution rate
