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Supreme Being
Group: Forum Members
Last Login: 7/3/2008 4:27:39 AM
Posts: 85, Visits: 383 |
| | We may have to take over a private lagoon. I was wondering if there were anything special to consider if the influent is always high in H2S? The reason for the high H2S levels (we believe) is due to an extremely long detention time in both the force mains from each home's grinder pump to the subdivisions pump station, and also in the force main that carries all that collected waste to our system some 1.9 miles away! Another problem is that there are only 17 homes on the system, so LOW flow.... The TSS' and BOD's are typically in the 300mg/L range, so no problem there, pH's are 7.5 ish... The lagoons came in to play when the subdivision couldn't comply with our pre- arranged agreement, and took it upon themselves to build and operate a lagoon! Now that the Department of Natural Resources has gotten involved, we may end up taking it all over. We have an activated sludge plant and no lagoon experience, so just looking for things we should consider, while exploring all options. Thanks,
doodie happens... |
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| | | Supreme Being
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Last Login: Yesterday @ 5:20:14 PM
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| | Can you give us some details on the lagoon, depth , volume , pre treatment etc?Some lagoons can work quite well in terms of BOD reduction but TSS is often an issue. Regards Terry F |
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Supreme Being
Group: Forum Members
Last Login: 7/3/2008 4:27:39 AM
Posts: 85, Visits: 383 |
| Those are unknowns at this time. The lagoons were constructed without a permit, so that process would have to be done too.
doodie happens... |
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| | | Supreme Being
Group: Forum Members
Last Login: Yesterday @ 5:20:14 PM
Posts: 210, Visits: 626 |
| | You are going to need to know the following as a minimum. Detention time: Depth Flow Loadings: BOD, SS Minimum daily pond temperature Once you have all this data a reasonable assessment on how well the lagoons may perform can be determined. Many states publish minimum acceptable design criteria for BOD5/acre/day , detention times , depths etc. These will vary depending on your latitude. Regards TerryF |
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| | | Supreme Being
Group: Forum Members
Last Login: Yesterday @ 5:20:14 PM
Posts: 210, Visits: 626 |
| | Further to my last you will need to know what level of sulfides is present in the influent. High sulfides can slow the lagoon system down and generally a derating factor has to be applied. Regards TerryF |
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| | | Junior Member
Group: Forum Members
Last Login: 7/4/2008 7:32:52 PM
Posts: 22, Visits: 73 |
| | You might want to consider dosing an iron salt upstream in the force main. While this will not get rid of the sulfide it will precipitate it as ferrous sulfide and you will be less likely to get releases of the odorous H2S. DavidJenkins |
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Supreme Being
Group: Forum Members
Last Login: 7/3/2008 4:27:39 AM
Posts: 85, Visits: 383 |
| Thanks for the info guys, much appreciated!
doodie happens... |
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| | | Forum Newbie
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