4.7 Article

Continuous aerobic granular sludge plants: Better settling versus diffusion limitation

期刊

CHEMICAL ENGINEERING JOURNAL
卷 428, 期 -, 页码 -

出版社

ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.131427

关键词

Aerobic granular sludge (AGS); Continuous flow plant; Treatment capacity; Better settling; Diffusion limitation; Wastewater treatment

资金

  1. Research Foundation - Flanders (FWO PhD fellowship strategic basic research) [1SC1220N]
  2. FWO ERC runner-up project

向作者/读者索取更多资源

The use of aerobic granular sludge in continuous wastewater treatment plants can increase treatment capacity, but the potential diffusion limitation may counteract the positive effects of improved settling. Optimization measures, such as increasing reactor volume fraction and adjusting oxygen set-points, can enhance the treatment efficiency and reduce energy consumption in continuous systems.
The application of aerobic granular sludge in continuous wastewater treatment plants is receiving increased attention. The introduction of better settling sludge in existing installations is expected to increase the plant's treatment capacity by allowing a higher biomass concentration in the reactor. A lot of recent research has therefore focused on how to get stable granules in a continuous flow plant, which make up the majority of current infrastructure. Still, the effect of aerobic granular sludge on the treatment capacity and energy requirements has not thoroughly been studied so far and is not that straightforward. While it is clear that the introduction of aerobic granular sludge will result in better settling, it will also bring about a higher diffusion limitation - which is often overlooked. This study scrutinized the effect of better settling versus diffusion limitation in a typical continuous activated sludge plant (predenitrification type) through a simulation study. When only considering the improved settling velocity, the treatment capacity increased by 40% compared to conventional activated sludge. However, diffusion limitation could almost totally counteract the positive effect of better settling for a non-improved continuous system. The continuous system could be improved for aerobic granular sludge by increasing the aerobic reactor volume fraction, while lowering the oxygen set-point to benefit from simultaneous nitrification-denitrification. The optimization led to a 20% improvement in treatment capacity and a 10% reduced energy consumption compared to a conventional activated sludge system. Overall, the performance of continuous wastewater treatment plants could indeed benefit from the excellent settling properties of aerobic granular sludge, as long as process operation was improved in order to take into account diffusion limitation.

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