摘要
以昆明市主城区污泥厌氧消化实验数据为基础,采用不同处理单元物质流与能量流相关联的方法,在不同进泥浓度与有机质含量条件下,比较了污泥厌氧消化与热干化联合系统的能效水平。结果表明,对于污泥厌氧消化系统,进泥加热是系统的主要耗能环节,将进泥浓度从5%提高至15%可以降低加热保温能耗2/3,污泥有机质含量从40%提高到50%时,厌氧消化的沼气产能增加至原来的2.2倍;高固体厌氧消化更适于低有机质含量污泥,可以满足系统能量自持的需求。对于污泥消化干化联合系统,热干化是最主要能耗环节,低有机质污泥消化产生的沼气仅能满足干化需求的19%~46%,而干化尾气余热可满足消化系统加热保温需求,因此采用高固体厌氧消化不能提高消化干化联合系统的能效比。
The energy-efficiency level of an integrated sludge treatment system, containing anaerobic digestion and thermal drying, was evaluated based on the experimental data obtained from a Kunming project. The material and energy balances in different processing units were calculated considering different sludge solids and organic contents. The result shows that the main energy consumption occurs in the process of heating feeding sludge during anaerobic digestion. When total solids content of feedingsludge increases from 5% to 15%, the energy required for temperature maintenance can be reduced two-thirds. When the organic content of feeding sludge increases from 40% to 50%, the biogas production can increase 2. 2 times. High-solids anaerobic digestion has the advantage of energy seff-sustaining, and consequently it is more suitable than conventional low-solids digestion for the treatment of low-organic-content sludge. In the system combining anaerobic digestion and thermal drying, thermal drying is responsible for the main energy consumption. The biogas generated from anaerobic digestion of low-organic-content sludge can only meet 19% ~ 46% of the energy requirement of sludge drying, while the residual heat contained in the exhaust gas from dryer can meet the requirement of anaerobic digestion. Therefore, it cannot improve the energy-efficiency of the integrated system using high-solids anaerobic digestion instead of conventional low-solids digestion.
出处
《四川环境》
2015年第3期96-99,共4页
Sichuan Environment
基金
国家自然科学基金面上项目
高含固污泥厌氧消化过程中含固率对污泥有机质降解效率的影响机制(51478239)
横向项目
城市污水污泥资源化潜力和途径评估(URRT2013005)
国家重大科技专项课题
昆明主城区污染物综合减排与水质保障关键技术研究与示范(2011ZX07302)
关键词
污泥
厌氧消化
热干化
能耗
Sludge
anaerobic digestion
thermal drying
energy consumption
作者简介
张玉瑶（1989-），男，河北石家庄人，清华大学深圳研究生院能源与环境学部环境工程专业2013级在读硕士研究生，研究方向为固体废物处理处置。
