| 湿热水解预处理对餐厨废弃物液相物质转化的影响 |
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| 引用本文： | 朱金龙,魏自民,贾 璇,李鸣晓,祝超伟,席北斗,夏天明.湿热水解预处理对餐厨废弃物液相物质转化的影响[J].环境科学研究,2015,28(3):440-446. |
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| 作者姓名： | 朱金龙 魏自民 贾 璇 李鸣晓 祝超伟 席北斗 夏天明 |
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| 作者单位： | 1.东北农业大学生命科学学院, 黑龙江 哈尔滨 150030 |
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| 基金项目： | “十二五”国家科技支撑计划重大项目“村镇环境综合整治重大科技工程”项目(2012BAJ21B02);国家自然科学基金项目(51178090) |
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| 摘 要： | 设计湿热水解预处理温度(80、120、150和200 ℃)、时间(40、50、60和70 min)、加水量(40%、60%、80%和100%)的三因素四水平正交试验,研究湿热水解预处理对餐厨废弃物液相可浮油脱出量、ρ(CODCr)、糖类、ρ(VFA)(VFA为挥发性脂肪酸)等的影响. 结果表明:餐厨废弃物经湿热水解预处理后可浮油脱出量明显提高. 在150 ℃、加水量40%、处理60 min的湿热水解条件下,可浮油脱出量(67.7 mL/kg)最高,比未经预处理的对照组提高了2.65倍；同时,ρ(还原糖)和ρ(总糖)也达到最高,分别比对照组增加了16.29%和38.92%.随着温度升高和处理时间的延长,ρ(CODCr)不断升高,在200 ℃、加水量40%、处理70 min的湿热水解条件下,ρ(CODCr)最高为109.729 g/L,比对照组提高了1.39倍. 经湿热水解预处理后,ρ(VFA)也呈显著增加,在200 ℃、加水量100%、处理40 min的湿热水解条件下,ρ(VFA)达到最高,比对照组增加了66.26%.预处理后,ρ(乙酸)、ρ(丁酸)升高,ρ(乙醇)降低. 方差、极差综合分析表明,在湿热水解过程中,温度是影响餐厨废弃物液相物质转化的主控因子,其次是加水量和时间.
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| 关 键 词： | 餐厨废弃物 湿热水解预处理 液相 物质转化 正交试验 |
Impacts of Liquid Substances Transformation of Kitchen Waste with Hydrothermal Pretreatment |
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| ZHU Jinlong,WEI Zimin,JIA Xuan,LI Mingxiao,ZHU Chaowei,XI Beidou and XIA Tianming.Impacts of Liquid Substances Transformation of Kitchen Waste with Hydrothermal Pretreatment[J].Research of Environmental Sciences,2015,28(3):440-446. |
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| Authors: | ZHU Jinlong WEI Zimin JIA Xuan LI Mingxiao ZHU Chaowei XI Beidou and XIA Tianming |
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| Affiliation: | 1.College of Life Science, Northeast Agricultural University, Harbin 150030, China2.State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China |
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| Abstract: | Abstract:The influences of floatable oil, chemical oxygen demand (CODCr), sugar and volatile fatty acids (VFA) from kitchen waste (KW) liquid substances transformation under hydrothermal pretreatments were investigated using an orthogonal experiment. The orthogonal experiments for three factors and four levels were conducted under different temperatures (80,0, 150 and 200 ℃), heating intervals (40,0, 60 and 70 min) and water addition amounts (40%, 60%, 80% and 100%). The results showed that the floatable oil content was improved significantly after hydrothermal pretreatment. The highest floatable oil content was 67.7 mL/kg at 150 ℃, 40%, 60 min hydrothermal condition, which was 2.65 times higher than the control. In addition, the maximum concentrations of reduced sugar and total sugar were obtained, which increased 16.29% and 38.92% respectively, compared with the control group. As temperature and heating interval increased, the maximum level of CODCr was 109.729 g/L at 200 ℃, 40%, 70 min hydrothermal condition, which was 1.39 times higher than the control. The VFA concentration was enhanced substantially, with the highest VFA concentration observed under 200 ℃, 100%, 40 min hydrothermal condition, which increased 66.26% compared to the control. In the liquid phase of KW, the acetic acid and butyric acid concentrations increased, while the ethanol concentration decreased after hydrothermal pretreatment. Variance and poor comprehensive analysis showed that the master factor affecting the liquid substances transformation of KW was temperature, followed by water addition amount and heating intervals. |
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| Keywords: | kitchen waste hydrothermal pretreatment liquid phase substances transformation orthogonal experiment |
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