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RE: Odor Control and H2O2

John Walton — Thu, 23 Aug 2007 15:41:20 GMT

The standard grade of municipal commerce is 50% w/w, though 35% is also widely available, and in certain geographies 27%.

RE: Odor Control and H2O2

Dvant — Tue, 21 Aug 2007 12:01:23 GMT

What % H2O2 are we talking about? I don't think we are talking about the stuff you pour on cuts.

Mark

RE: Odor Control and H2O2

Diana — Tue, 21 Aug 2007 10:37:04 GMT

Ouplant utilizes magnesium hydroxide / Thioguard with great success in the reduction of H2S throughout the plant that also improves clarification and lower sludge odors.

RE: Odor Control and H2O2

Jeff Naumann — Tue, 29 May 2007 11:51:35 GMT

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).

RE: Odor Control and H2O2

Paula — Tue, 29 May 2007 11:13:44 GMT

Hello

After same days in bed because of a flu, I am here again.

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

RE: Odor Control and H2O2

Odorguy — Fri, 11 May 2007 12:10:16 GMT

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.

RE: Odor Control and H2O2

Jeff Naumann — Thu, 10 May 2007 16:05:16 GMT

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?

RE: Odor Control and H2O2

Paula — Thu, 10 May 2007 14:23:40 GMT

The effluent just before entering to the plat is about 300mg/L:BOD and total flow about 3m3/seg)

RE: Odor Control and H2O2

MR_HOLMES — Tue, 16 Jan 2007 18:25:17 GMT

We use a product called Bioxide. It is like a nitrate fertilizer. It is very concentrated and will burn vegetation at full strength. Anyways it works very well for us. We introduce it at a station in the collection system and by the time it reaches our headworks the smell is reduced significantly. It is made by US filter. We use about 65 gallons per day in the summer and 25 per day in the winter. We've used as much as 100 gallons per day. It just depends.

RE: Odor Control and H2O2

Odorguy — Tue, 16 Jan 2007 17:56:32 GMT

Hypochlorite could potentially oxidize some of your ammonium and also decreases the dewaterability of the sludge. It breaks down the sticky coating on the cells which decreases its dewatering characteristics and could cause you to increase your polymer to account for it. VX 456 is sodium chlorite, which works well since it will not oxidize ammonium. If you can find a cheaper source of this chemical you could save some money. I would try iron salts, since they react with sulfide well (down to about 0.1 mg/l) and increase the dewaterability of the sludge. If you do this, I would sent the filtrate back to the head of the plant to get some benefit from the residual iron. Permanganate also generally improves the dewaterability of the sludge but is expensive, difficult to handle/mix and will oxidize ammonium.

RE: Odor Control and H2O2

nicholas1982 — Sun, 14 Jan 2007 21:26:47 GMT

I work at an 15 mgd activated sludge plant and we use a chemical (VX456 trade name) sodium nitrate/sodium chlorite solution to control H2S in our gravity belt building. We inject it about 30 feet before it sludge hits the belt. VX456 is designed to attack sulfide compounds, and does not oxidize ammonium nitrogen which is a concern if you land apply the sludge. The draw back is that the chemical is very expensive. I am interested if anyone uses sodium hypochlorite for am application similar to mine.

Nick

RE: Odor Control and H2O2

Victor — Sun, 14 Jan 2007 17:08:10 GMT

Ron:

There was an article entitled "Hydrogen Sulfide Odor Control in Wastewater Collection Systems", by Peter Churchill and David Elmer, Vol. 33, No. 1, pp 57-63, and published in the May 1999 issue of NEWEA Journal. You can probably still download it for free from New England Water Environment Association website newea.org and download it using the following link:

http://www.newea.org/download.htm

The PDF is about 2.28 Megs in size. It is an excellent FREE journal and it packed with a lot of excellent information. Thanks to NEWEA for providing this excellent free resource!

RE: Odor Control and H2O2

Jerry — Sun, 14 Jan 2007 16:43:47 GMT

I assume you have an Activated Sludge type treatment plant.

If you do, submerge your influent pipe outlet to about one, or one and a half feet from the bottom of your aeration basin. In most cases it will eliminate or reduce the odors to acceptable levels. The activated sludge will absorb all or most of the H2S and other odourous chemicals in suspension. As a polisher, you can cover the aeration basins.

If your odors are coming from your sludge handling facilities, then this is a different animal.

RE: Odor Control and H2O2

Ron Halter — Sat, 13 Jan 2007 20:28:47 GMT

My hometown plant has a bad odor problem. They blame it on industry. Hydrogen Sulfide is their reasons given. They are thinking of using peroxide at three of the industries. I think they are wrong. I found a town here in Ohio that uses Calcium Nitrate in their collection system, mainly at the lift stations.

If anyone has information regarding this method let me know.

Our main problem is the odor from the plant bothering a retail establishment that is about 300 yards downwind from the plant. There are approx. 30 stores and eating establishments inthis downwind area(Walmart, Loews, Appelbees, Burger King, IHOP, just to name a few). We recently completed a $35 million expansion/upgrade. The odors started after it was completed.

RE: Odor Control and H2O2

John Walton — Mon, 05 Jun 2006 16:18:09 GMT

H2O2 is one of the five primary chemicals used for sulfide control in the municipal wastewater industry (the others being iron salts, chlorine/hypochlorite, nitrates, and permanganates). As a result of e.g., chlorine replacement in pulp bleaching, H2O2 use has grown over the past 25 years as its production capacity has grown > 5x and its (inflation adjusted) price has decreased 70-80% while those of iron salts have more than doubled. That said, H2O2 use for solids odor control is not as widespread as permanganate and iron salts, for the following reasons:

1) The H2O2-Sulfide reaction in solids slurries typically takes 3-10 minutes to reach 90% completion (after complete mixing). Such holding times are not always available before a dewatering process;

2) H2O2 reactivity toward mercaptans is much less than e.g., permanganate or chlorite, and so 'organic' odors typically remain even though H2S levels are lowered. These organic odors can be 'bioremediated' by adding the H2O2 to a sludge holding tank within 15 - 45 minutes prior to dewatering - the H2O2 provides D.O. for biomediated oxidation of the mercaptan odors - though again this is not always practical;

3) H2O2 provides little in the way of durational control of sulfide. This is in contrast to iron salts that can be added to digester influents, with sulfide control extending to the dewatering operation. To a lesser extent than sulfide, iron salts will bind to mercaptans to reduce their emission.

There are, however, situations where these constraints are not limiting in which cases H2O2 addition is cost-effective. I can provide you with a list of several such reference facilities if you wish, as well as a test procedure to compare / estimate chemical use. Please e-mail me directly.

Regarding interference with dewatering polymers (there’s no impact on lime stabilization), gross overdosing (e.g., by > 5x the H2O2 requirement) may impact dewatering by supersaturating the solids slurry with entrained oxygen, but there’s no significant chemical reaction between H2O2 and traditional polyacrylamides under normal circumstances. On the contrary, if significant levels of Fe2+ are present (from e.g., Fe addition to digesters) then the sulfide oxidation reaction can take place much faster and in the process hydrous ferric oxide can be produced, resulting in improved coagulation and/or reduced polymer demands.

RE: Odor Control and H2O2

Jeff Naumann — Wed, 31 May 2006 10:42:22 GMT

The use of peroxide probably would not adversely impact the sludge thickening operation. It is used sparingly (not very often) because cheaper options are available - ie, chlorine, lime, etc.

Odor Control and H2O2

Waterbug — Mon, 16 Jan 2006 18:56:01 GMT

Recently my wastewater plant coducted a series of air analyses from our on site scrubber units. The results indicated a combination of both mercaptans and hydrogen sulfide. I have been trying to collect information on the effects of hydrogen peroxide addition to belt filter press influent however this seems to be an infrequently used chemical. Can anyone give me an idea of what I might be looking at as far as dewatering interferance with Polymers and lime stabilization?