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Rick could you compare an Aerobic MBR to an Anaerobic MBR please?
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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
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traditional secondary clarifier or a dissolved air flotation unit on the backside of your biological reactor. You can see very low TSS, pretty
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much nondetectable in most cases, along with improved organics removal, both COD and BOD. Both of the systems, whether it be
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anaerobic or aerobic will reduce the footprints required since you’re using a membrane as your solids separation device, so you’re able to
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maintain much higher mixed liquor concentrations within your reactors so, therefore, the volume of your reactors is going to go down,
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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
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advantage to get you down to very low COD and BOD removals without the need for downstream anaerobic treatment and, generally, you
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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
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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
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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
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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
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talked about operating and cleaning requirements earlier. With an Anaerobic MBR you’re generating biogas so, with certain types of
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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.
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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
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an Anaerobic MBR, you’ve got a more closed system and you’re dealing with a which adds some complexity, some additional safety
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requirements and some additional valves and controlling, and like I mentioned before, your membrane tanks are covered in an Anaerobic
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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
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there’s several years of operating performance and hundreds of installations out there, where Anaerobic MBR is relatively the new kid
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on the block but there are growing applications and some numbers of installations that we’re seeing.