Optimization of operational parameters for a submerged membrane bioreactor treating dyehouse wastewater
Optimization of operational parameters for a submerged membrane bioreactor treating dyehouse wastewater
复制标题
DOI：
10.1016/j.seppur.2004.12.004
复制
发表时间：
2005-07
影响因子：
8.6
通讯作者：
P. Schoêberl;M. Brik;M.A.R. Bertoni;R. Braun;W. Fuchs
中科院分区：
文献类型：
--
作者：
P. Schoêberl;M. Brik;M.A.R. Bertoni;R. Braun;W. Fuchs
采用23因子试验设计，研究了抽吸时间、反冲洗时间和曝气强度对膜污染的影响。在60 L曝气活性污泥池中，采用孔径为0.4μm的管式膜组件处理印染废水。以最大和最小吸气时间（8- 16 min）、反冲洗时间（25- 45 s）和曝气强度（0.3-0.9m3/（m2 h））作为膜运行的基础。使用每个实验在7天的操作时间内的平均阻力增加速率来评价结垢行为。就三个因素的结垢能力而言，抽吸时间对阻力增加的影响最大，其次是曝气强度和反冲洗时间。曝气强度和反冲洗时间都有助于减少污垢在类似的水平，并表现出显着的相互作用与抽吸时间。曝气强度和反冲洗时间强烈影响在高抽吸时间的污垢。有一个临界净通量比为0.85，低于该值，高曝气强度不会进一步改善污垢。超过临界值，发生严重的污垢。在一定程度上，曝气强度的增加可以抵消这种影响。同时考虑膜面积要求、能量需求和化学清洗间隔等成本相关参数，假设最佳条件处于临界值。此时，抽吸时间可在8- 14.2 min的范围内变化，相应的反冲洗时间分别在25.3和45 s之间。由于与抽吸时间相关的结垢可能性，建议在8 min的最小值下操作。
In the present study the influence of suction time, backflush time and aeration intensity on fouling was investigated using 23factorial design. The experimental study has been performed using a tubular membrane module (pore size 0.4μm) immersed in a 60l aerated activated sludge tank treating dyehouse wastewater. Maximum and minimum values for suction time (8–16min), backflush time (25–45s) and aeration intensity (0.3–0.9m3/(m2h)) were adopted as the base of membrane operation. Average resistance increase rate over an operation time of 7 days for each experiment was used to evaluated fouling behavior. Concerning the fouling ability of the three factors, suction time was observed to have the largest effect on resistance increase followed by aeration intensity and backflush time. Both aeration intensity and backflush time contributed to fouling reduction at a similar level and exhibited significant interactions with suction time. Aeration intensity and backflush time strongly affected fouling at high suction time. There was a critical netflux-ratio of 0.85, below which high aeration intensity did not further contribute to fouling amelioration. Above the critical value heavy fouling occurred. This effect can be outbalanced by an increase in aeration intensity to a certain extent. With simultaneous consideration of cost relevant parameters in terms of membrane area requirements, energy demand and chemical cleaning interval, optimum conditions was assumed to be at the critical value. At this point suction time can be varied in the range of 8–14.2min with a corresponding backflush time between 25.3 and 45s, respectively. Due to the fouling potential associated with suction time operation at the minimum value of 8min was suggested.