混合厌氧消化论文：半连续餐厨垃圾与猪粪混合厌氧消化性能及动力学研究.doc

混合厌氧消化论文：半连续餐厨垃圾与猪粪混合厌氧消化性能及动力学研究【中文摘要】随着国家经济发展,城市居民生活水平迅速提高,餐厨垃圾与畜禽粪便等生物质垃圾的产生量也相应剧增,在生物质垃圾处理已成为一个亟待解决的难题的同时也为资源化处理提供了丰富的物料来源。将餐厨垃圾与畜禽粪便进行混合厌氧消化,可最大程度地处理其有机组分,降低污染,又可产生沼气,回收能源,一举两得,真正实现了垃圾的无害化、资源化。本试验以餐厨垃圾与猪粪为试验原料,自制CSTR厌氧反应器(continuous stirred tank reactor,连续搅拌厌氧反应器),对半连续式进料条件下的餐厨垃圾与猪粪混合厌氧消化行为进行实验室研究。研究表明：随着有机负荷从0.5、0.75、1.OgVS/L.d递增,直至试验酸化前,pH值维持在7.1左右,VFA浓度经历了反应初期的波动后,一直稳定在9001400 mg/L之间。消化进行到第66天时,pH降至6.7,VFA升高至5208mg/L,试验出现酸化。当有机负荷为0.75gVS/L.d时即消化第26天系统出现了最大日产气量、最大日产甲烷量和最大单位原料产气率,分别为7850mL、4357mL和0.78L/gVS。不同有机负荷下的平均甲烷含量分别为38%、51%和42%。说明负荷为0.75gVS/L.d时,厌氧消化达到平衡,试验性能最佳。通过对0.75gVS/L.d负荷下的产气过程动力学分析显示,此阶段试验厌氧消化产气过程符合一级动力学方程y,=w(1-e-k1t)=0.8035(1-e-0.2067t),相应的动力学参数k1=0.2067。用此模型来估算该条件下的最大单位原料产气率w为0.8035 L/gVS,与试验值相对误差仅为3.0%,本研究为生物质垃圾混合厌氧消化动力学模型的构建提供了新的思路。【英文摘要】As the economy developing and improvment of living standards, Kitchen waste, animal manure and other biomass waste will heavily increase. Through biomass waste disposal has becomed a pressing problem, it also provides a rich resource of waste recycling. The anaerobic co-digestion of kitchen waste and pig waste can not only maximize the treatment of organic components and reduce pollution, but also produce biogas and recycle energy, which makes harmless and recycling waste become a reality.In this experiment, the anaerobic co-digestion of kitchen waste and pig waste was conducted in a CSTR anaerobic reactor by a semi-continuous mode. The results showed that:with gradually increasing organic loading rate (OLR), before acidification pH value was maintained at 7.1 and VFA concentration was stable at 900-1400mg/L in addition to the fluctuation during the early experiment. To 66 days of digestion, when pH value dropped to 6.7 and VFA concentration increased to 5208mg/L, test appeared acidification. The maximum daily gas production, the maximum daily methane production and the maximum value of biogas yield under OLR of 0.75gVS/L.d were about 7850mL,4357mL and 0.78L/gVS, respectively. The average CH4 content were about 38%,51% and 42% at different OLRs. The anaerobic digestion achieved balance and optimum performance under OLR of 0.75gVS/L.d. Gas production process of anaerobic digestion conformed first-level kinetic equation y1=w(1-e-k1t)=0.8035(1-e-0.2067t) under OLR of 0.75gVS/L.d, the corresponding kinetic parameters k1=0.2067. Use this model to estimate the maximum value of biogas yield w as 0.8035L/gVS, with the experimental relative error as 3.0%. This study provided a new way to build a kinetic model of anaerobic co-digestion of biomass waste.【关键词】混合厌氧消化 半连续 餐厨垃圾 猪粪 有机负荷 物料平衡 动力学【英文关键词】anaerobic co-digestion semi-continuous kitchen waste pig waste organic loading rates material balance kinetic model【目录】半连续餐厨垃圾与猪粪混合厌氧消化性能及动力学研究摘要6-7Abstract7第一章 绪论10-161.1 餐厨垃圾的产生及处理现状10-121.1.1 餐厨垃圾的来源与组成101.1.2 国外餐厨垃圾处理现状10-111.1.3 国内餐厨垃圾处理现状11-121.2 畜禽粪便的产生及处理现状12-141.2.1 畜禽粪便的来源与危害121.2.2 国外畜禽粪便处理现状12-131.2.3 国内畜禽粪便处理现状13-141.3 课题研究的意义及内容14-161.3.1 研究意义141.3.2 研究内容14-151.3.3 主要技术路线15-16第二章 厌氧消化技术概述16-302.1 厌氧消化技术原理16-262.1.1 厌氧消化技术微生物学原理16-202.1.2 厌氧消化技术动力学原理20-232.1.3 基本营养型有机物厌氧消化反应原理23-262.2 厌氧消化技术控制因素研究现状26-282.3 混合厌氧消化技术国内外研究现状28-30第三章 实验方案与分析方法30-373.1 实验目的303.2 实验内容303.3 实验装置与材料30-323.3.1 实验装置30-313.3.2 实验材料31-323.4 常规指标分析方法32-353.5 实验运行与维护35-37第四章 自制CSTR厌氧反应器试运行试验37-414.1 试验方案37-384.2 试验结果与分析38-404.2.1 猪粪厌氧消化过程pH变化38-394.2.2 猪粪厌氧消化过程产气情况分析39-404.3 自制CSTR厌氧反应器试运行效果评价40-41第五章 半连续式餐厨垃圾与猪粪混合厌氧消化研究41-505.1 试验方案415.2 试验结果与分析41-495.2.1 半连续式混合厌氧消化过程pH变化41-435.2.2 半连续式混合厌氧消化过程VFA变化43-445.2.3 半连续式混合