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| |  Posted 5/10/2007 4:05:16 PM | |
| Supreme Being
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| Does it cost-effective applies H2O2 directly to an effluent with a high organic charge content and very high grease content (because of here is important the fishery industry) to achieve odor control in the collection system? or you should applies it after a primary treatment in the treatment plant and use another technologies for the collection system odor control?
The effluent just before entering to the plant is about 300mg/L:BOD and total flow about 3m3/seg)
The cost effectiveness will depend upon the details of your particular situation. Is the BOD of 300 mg/l and 3 m3/sec. pertain to just the fish processing flow, or to the total plant flow?
You indicate that you have a waste from fish processing, which has a high BOD and oil & grease concentration. I am very familiar with the fish processing industry, having been at one time the environmental manager for Star-Kist Foods (tuna and petfood). In my particular experience the fish processing plants installed DAF (dissolved air flotation) treatment systems, which significantly reduced the TSS and O&G content from the waste. However, we also used seawater in some of our processes, which contributes lots of sulfate from the seawater. Hence, no shortage of available sulfur to produce H2S.
Do you know if your local fish plants are using and discharging sea water to your collector system? If so, can they replace the seawater (free just for the pumping) with fresh water (costs something, but little sulfate)?
Do the local plants do any "effective" pre-treatment before discharging their waste to the sewer? If so, how effective is it?
Jeff Naumann
(310) 540-0045
FAX (310) 540-0337
http://www.jeffnaumannassociates.com/ |
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| | | Posted 5/11/2007 12:10:16 PM | |
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| Industrial discharges can sometimes influence odor production but they are rarely the sole cause. If the odors began after the upgrade, did the industries just start up after the upgrade? I doubt it, therefore, something to do with the upgrade is causing the odors. You will need an independent odor survey performed since the engineers that did the upgrade will be biased. The survey should locate the sources that are causing complaints and recommend control solutions. Get an engineering firm to do this since vendors are also biased.
It sounds like your headwords is the cause, which means that H2S is coming in with the flow. Depending upon the concentration you may be able to add chemicals upstream. If your flow is too much then you could capture and treat the air. There are some really good new biological technologies that don't require chemicals and can remove H2S using only plant reuse water. If you want to contact me offline I could give you some names. |
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| | | Posted 5/29/2007 11:13:44 AM | |
| Junior Member
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| | Hello After same days in bed because of a flu, I am here again. The BOD of 300 mg/l and 3 m3/sec. pertain to the total plant flow. We receive in our collector system a waste from a fish processing, which has a high BOD and oil & grease concentration because of their treatment before discharging their waste to the sewer in many cases is not effective. We are thinking to treat a part of the total effluent that comes from fish industry separately maybe with DAF treatment systems, too. However, now we haven't a solution yet, because we have to define the place and the maximum flow that could be possible treat with this technology. I don't know if they use seawater in their processes, it`s a good advice, thank you. In resume our local plants nowadays receive an total effluent with hight DBO. We only have a pre-treatment before discharging our waste to sea (outfall), and the environment is not affected. We are trying to abate the odor in the collection system with chemical treatment, so that why I wanted to know if the use of H2O2 near the plant could be a partial solution despite the high DBO content of the total effluent or it is ridiculous. Actually we are using ferric chloride. but we go on studying another alternatives. Thank you for your answers
Paula |
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| | | Posted 5/29/2007 11:51:35 AM | |
| Supreme Being
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Last Login: 9/22/2008 6:07:19 PM
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| The BOD of 300 mg/l and 3 m3/sec. pertain to the total plant flow. We receive in our collector system a waste from a fish processing, which has a high BOD and oil & grease concentration because of their treatment before discharging their waste to the sewer in many cases is not effective. We are thinking to treat a part of the total effluent that comes from fish industry separately maybe with DAF treatment systems, too. However, now we haven't a solution yet, because we have to define the place and the maximum flow that could be possible treat with this technology.[quote]
[quote]I don't know if they use seawater in their processes, it`s a good advice, thank you.[quote]
[quote]In resume our local plants nowadays receive an total effluent with hight DBO. We only have a pre-treatment before discharging our waste to sea (outfall), and the environment is not affected.[quote] What, exactly, is your treatment process?
[quote]We are trying to abate the odor in the collection system with chemical treatment, so that why I wanted to know if the use of H2O2 near the plant could be a partial solution despite the high DBO content of the total effluent or it is ridiculous.[quote]
Actually we are using ferric chloride. but we go on studying another alternatives.
From you information, I assume that your plant, and the fish processing operations, are located near the sea.
If in fact your total plant flow is 3 m3/second, the amount of H2O2 required could be quite large. That equates to a total plant flow of 68 MGD, which is a fairly large plant. Is that correct? Where are you located? I would suggest that your better option might be to concentrate on the "upstream" causes of the problem (fish processing, and possibly other causes).
What is the total flow, oil & grease, TSS, and BOD from the fish processing? Can you find that information? DAF treatment is effective with oily wastes, such as fish processing. What might the possibility of the fish plants operating a DAF system. Note that the DAF system must be "Operated Properly" or it will be a ineffective effort (this is from my personal experience).
Jeff Naumann
(310) 540-0045
FAX (310) 540-0337
http://www.jeffnaumannassociates.com/ |
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| | | Posted 8/21/2007 10:37:04 AM | |
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| | Ouplant utilizes magnesium hydroxide / Thioguard with great success in the reduction of H2S throughout the plant that also improves clarification and lower sludge odors. |
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| | | Posted 8/21/2007 12:01:23 PM | |
| Supreme Being
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| | What % H2O2 are we talking about? I don't think we are talking about the stuff you pour on cuts. Mark |
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| | | Posted 8/23/2007 3:41:20 PM | |
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| | The standard grade of municipal commerce is 50% w/w, though 35% is also widely available, and in certain geographies 27%. |
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