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Rick could you compare an Aerobic MBR to an Anaerobic MBR please?
Yeah sure, a few thoughts on that is, well first off, both types of MBR systems will achieve a higher quality effluent as to compared with a
traditional secondary clarifier or a dissolved air flotation unit on the backside of your biological reactor. You can see very low TSS, pretty
much nondetectable in most cases, along with improved organics removal, both COD and BOD. Both of the systems, whether it be
anaerobic or aerobic will reduce the footprints required since you’re using a membrane as your solids separation device, so you’re able to
maintain much higher mixed liquor concentrations within your reactors so, therefore, the volume of your reactors is going to go down,
reducing your footprint. One of the advantages of an Anaerobic MBR is, if you’re just looking at removing organics, the COD and BOD, its got the
advantage to get you down to very low COD and BOD removals without the need for downstream anaerobic treatment and, generally, you
would be able to get pretty much below any surcharge limits for BOD, which are typically in the 250-300 mg/L range. You should be able to get
down below that with an Anaerobic MBR. Also with an Anaerobic MBR, by retaining your solids within the system, you do have a greater ability
to digest, I’ll say some, troublesome biodegradable solids, if you would. By keeping them in the system with a long retention time, you are able
to break them down much better than you would in a traditional system, and I talk about that a little bit later in the talk here. Jim also
talked about operating and cleaning requirements earlier. With an Anaerobic MBR you’re generating biogas so, with certain types of
systems, you have to use a gas to scour the membranes to keep them clean, to keep your flex rate up going through the membranes.
In an Aerobic MBR, you’re using air to do that. In an Anaerobic MBR you’re using, you’re typically using biogas. So with that in mind, having
an Anaerobic MBR, you’ve got a more closed system and you’re dealing with a which adds some complexity, some additional safety
requirements and some additional valves and controlling, and like I mentioned before, your membrane tanks are covered in an Anaerobic
application where they’re not in an Aerobic application. Now last but not least, Aerobic MBR’s have been around for a long time now and
there’s several years of operating performance and hundreds of installations out there, where Anaerobic MBR is relatively the new kid
on the block but there are growing applications and some numbers of installations that we’re seeing.


Water Matters 3: Aerobic MBR vs. Anaerobic MBR

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歐陽億 2016 年 7 月 14 日 に公開
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