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Two Phase Anaerobic Digestion in Membrane Separated Bio-Reactor

膜分离生物反应器中的两相厌氧消化

基本信息

批准号：
63550400
负责人：
AYA Hidenori
金额：
$ 1.02万
依托单位：
Musashi Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1988
资助国家：
日本
起止时间：
1988 至 1990
项目状态：
已结题

项目摘要

Membrane separated bio-reactor was found to be an appropriate technology for single-phase anaerobic digestion rather than for two-phase anaerobic digestion. In the first year of the program, membrane separated anaerobic digestion was studied in laboratory scale experiments. Glass bottles (3L) were prepared as reactors, which were heated and mixed with magnetic stirrers and hot plates. Membrane modules (75mm diameter) with ultrua-filtration membrane were connected to the reactors therefore separating permeate from the mixed liquor by suction. Sewage sludge from an actual wastewatter treatment plant was used as a substrate and was fed to the reactors everyday. In the second year of the program the volume of the reactors was increased to 5L with the purpose of measuring mass balance in the reactors. The diameter of the membrane module was also increased to 150mm. In the last year of the program, plastic reactors were used instead and mechanical mixing was introduced. Hollow-fiber membrane … More module was used for the separation. The operation had been very good and stable during a long period. The results and conclusions obtained in the last year of the research were as follows.(1) CODcr concentration of the permeate was less than 200mg/l when the production rate of methane gas was reasonably high.(2) MLSS concentration in the reactor was increased up to 40,000mg/l with the increase of the substrate loading rate.(3) About 60% MLSS in the reactor had been organic matter during the operation and no accumulation of inorganics in the rector was observed.(4) The self-degradation rate of MLSS was very low.(5) Volatile fatty acid concentration becomes the highest level in 4-5h after the feeding of sludge and then gradually decrease.(6) Hydrolysis rate of solids in the reactor was very low.(7) Both microfiltration membrane and ultrafiltration membrane can produce treated water at almost similar quality level. High molecular weight organics were removed in the both system.(8) It took several weeks for the recovery of the operation even by the reduction of the loading rate when methane production was damaged.An equilibrium condition can be obtained in the reactor balancing the growth of bacteria and the selfdegradation by preventing the wash-out of bacteria completely with the membrane separation. Input organics can almost completely go to gas phase besides organics in the permeate (less than 1% of total input). Inorganics, which occupies more than 30% of sludge will be dissolved completely. Ash treatment could be non-necessary process by introducing membrane-separated anaerobic digestion. Less

膜分离生物反应器是一种适合于单相厌氧消化的工艺，而不是两相厌氧消化工艺。在项目的第一年，在实验室规模的实验中研究了膜分离厌氧消化。制备玻璃瓶（3L）作为反应器，将其用磁力搅拌器和热板加热和混合。将具有超滤膜的膜组件（75 mm直径）连接到反应器，从而通过抽吸从混合液中分离渗透物。来自实际废水处理厂的污水污泥被用作基质，每天被进料到反应器中。在该计划的第二年，反应器的体积增加到5L，目的是测量反应器中的质量平衡。膜组件的直径也增加到150 mm。在该计划的最后一年，使用塑料反应器代替，并引入了机械混合。中空纤维膜 ...更多信息模块用于分离。长期以来，手术效果良好，稳定。去年的研究结果和结论如下。(1)当甲烷气产率较高时，出水CODcr浓度小于200 mg/l。(2)反应器中MLSS浓度随基质负荷的增加而增加，最高可达40，000 mg/l。(3)运行过程中反应器中约60%的MLSS为有机物，未观察到无机物在反应器中积累。(4)MLSS的自降解率很低。(5)挥发性脂肪酸浓度在污泥投加后4- 5 h达到最高值，随后逐渐下降。(6)反应器中固体的水解速率很低。(7)微滤膜和超滤膜都可以生产几乎相似质量水平的处理水。高分子量有机物在两个系统中被去除。(8)当甲烷产量受损时，即使降低负荷率，也需要几周时间才能恢复运行。通过膜分离完全防止细菌的冲洗，可以在反应器中获得平衡细菌生长和自降解的平衡条件。除了渗透物中的有机物之外，输入的有机物几乎可以完全进入气相（小于总输入的1%）。占污泥总量30%以上的无机物将被完全溶解。通过引入膜分离厌氧消化，可以使灰渣处理成为非必要过程。少