4/30/2023 0 Comments Plant design coarses![]() ![]() ![]() ![]() Selectors designed purely to discourage filamentous growth would have an average retention time of between 10 and 20 minutes ( Wanner, 1998), while tanks designed to remove nitrate would have a much longer retention time. However, if selector zones are incorporated into the plant, then final tanks can be sized to a lower value of 100 ml/g. įinal tanks also need to be large enough to cope with a peak SSVI of 120 ml/g.Spray bars fitted to final tank scrapers are also useful for dispersing and avoiding the proliferation of foams. ![]() Ībility to return a maximum of 150% dry weather flow as RAS (return activated sludge) is also important in counteracting the effects of poorly settling sludge.It has also been observed that plants with insufficient aeration capacity to cope with diurnal load variations or breakdown of aeration equipment are more prone to outbreaks of filamentous bacteria. avoiding complete-mix systems in favour of plug-flow) to promote the growth of good settling bacteria. Īttention to the layout of new designs (e.g.Good aeration plant design is only the first step in the elimination and prevention of activated sludge bulking or foaming. ![]()
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