【作者】 华娟；

【导师】 吴志超；

【作者基本信息】 同济大学 ， 环境工程， 2007， 硕士

【摘要】 本文针对剩余活性污泥平板膜浓缩及平板膜同步浓缩消化工艺展开研究，主要考察了工艺可行性、工艺操作条件优化、工艺运行方式优化等内容，发现：(1)平板膜污泥浓缩和平板膜污泥同步浓缩消化工艺完全可行。经平板膜浓缩后剩余活性污泥由3g／L上升至30g/L，膜分离出水可回用。而平板膜污泥同步浓缩消化工艺运行15d后MLSS浓度达25g／L，累积MLVSS消解率高于60％，出水水质达中水回用标准。(2)平板膜浓缩工艺中，膜通量和抽停比两者结合得到较短水力停留时间时，污泥浓缩效果较好。但在运行通量相同时，较大的抽停比有利于减缓膜污染。曝气强度对浓缩工艺影响不大。(3)中试平板膜污泥浓缩工艺中采取先高通量、后低通量的运行方式可提高污泥浓缩速率。此外，相对于完全排泥和排泥1／2的工况，排泥2／3的工况出水水质佳、膜污染趋势相对缓和。(4)小试平板膜污泥同步浓缩消化操作条件优化研究表明，膜通量为14L／m~2·h，曝气强度为2m~3／h，抽停比为5min:5min时运行效果最佳。高温对消解率的提高帮助不大，但有利于减缓膜污染。(5)小试平板膜污泥同步浓缩消化工艺中，剩余消化污泥体积的不同对污泥消解率、出水水质影响不大。投加粉末活性炭和沸石粉均能使膜阻力下降20％左右，而投加沸石粉后效果更优。更多还原

【Abstract】 It is studied in this research that the plat membrane applying to excess activated sludge concentration, co-concentration-digestion, including researches of feasibility and optimal operation condition both in laboratory scale and factory scale. Besides, the effect of addition of activated carbon powder and zeolite powder during the sludge co-concentration -digestion is also studied.(1) Both of the two crafts are feasible. The practical operation of sludge concentration using plat membrane results at a 30g/L MLSS concentration and reusable effluent. While the sludge co-concentration-digestion operation shows a 60% sludge digestion rate of total MLVSS, 25g/L MLSS concentration and also reusable effluent.(2) The effects of factors such as aeration intensity, membrane flux and the ratio of suction time to non-suction time on the results of plat membrane sludge concentration are investigated. It is found that aeration intensity has little effect on the ultimate sludge concentration. However, the membrane flux and suction time affects sludge MLSS concentration due to their relation to HRT. For the effluent quality, all of these factors affect little. For the membrane fouling, a bigger ratio of suction time to non-suction time is favored.(3) During the factory scale operation of sludge concentration using plat membrane, Researches of the different volume of the sludge kept for the next turn are investigated, which results that 1/3 of the sludge kept in the reactor is the best for effluent quality. The variation of membrane flux of the operation in different stages in order to accelerate the sludge concentration process is possible.(4) The effects of factors as aeration intensity, membrane flux, ratio of suction time to non-suction time and the temperature on the results of laboratory scale sludge co-concentration-digestion using plat membrane are investigated. Under such operation condition as membrane flux of 14L/m~2.h, aeration intensity of 2m~3/h and 5min suction time to 5min to non-suction time is the best.(5) During the sludge co-concentration-digestion operation of laboratory scale, we also study the effects of digestion sludge volume left of the last turn and found little. Moreover, we study researches of add of activated carbon powder and zeolite powder, and found both of the two powders can reduce about 20% membrane resistance comparing to the operations without these additives, and the one with zeolite powder results better than the one with activated carbon powder.更多还原