DO2E Waste Water Treatment LLC

DO2E digester with hybrid ozone applied

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Courtesy of DO2E Waste Water Treatment LLC

In an earlier document, I put forth a rationale for treatment of waste streams using our DO2E digesters and even mentioned the Aerators in passing. Let us concentrate our efforts with respect to ozone, especially with the Digesters, to three application areas: grease traps, selected lift stations, and down line treatment areas such as polishing ponds and effluvia of various sorts.

The DO2E digester process actually converts these collection basins into pretreatment tanks more so effectively when Hybrid Ozone is applied directly into the waste stream.

Ozone has usually (historically) been applied as an oxidizing agent and as a sterilant. The latter results from its oxidizing characteristics exclusively. The DO2E digestion process actually utilize it to do both, though a primary use is for it to break down recalcitrant molecules encountered in F.O.G. (Fats, Oils, & Grease) deposits (found in both grease traps and lift stations) as well as to attack the “diverse” compounds (found primarily in lift stations) encountered in various waste streams that are difficult to treat in other manners. Examples of these include various hydrocarbons known as heterocyclics, polyaromatic hydrocarbons (P.A.H.), other aromatic hydrocarbons that are difficult for bacteria to degrade and/or are toxic for specific microorganisms used in the degradation processes, or for some other reason are very difficult to deal with. In the cases where ozone treatment is effective, the resulting compounds formed are carbon dioxide, water, and various other oxides.

Another use we have found for ozone is to place an adsorbed charge on micro particulates engendered in our Digesters. This enables us to prevent them from settling out in the lines, to stabilize the suspensions formed so that they are pumpable, and to enable plant treatment operators to avoid “shear” problems in their clarifiers.

Yet another application for our Digesters is the delivery of hybrid ozone to fluid streams containing metallic ions (or is some cases, non-metallic ions) so that they precipitate out or become complexed making them more easily removed.

The sizing of the delivered ozone depends on the actual problem(s) encountered; the horsepower of the Digester blower, the number of ozone tubes necessary to deliver whatever level of ozone we feel is adequate for the actual problems encountered, and taking into account any down line considerations such as impacting on microbial populations that are not targeted.

Grease traps require the highest ozone levels to effectuate grease (F.O.G., actually) management, to control odors (particularly H2S), and to stabilize the suspension formed. The effect on the microbial community here is relatively a minor concern as any buildup in microbial numbers would adversely affect any forced main in the collection chain. Therefore, the sterilization effect of the ozone is a good thing in grease traps. Because of the relatively immediate reaction of the ozone we are using, dwell time and down line residuals can be safely ignored.

A more complex decision situation occurs where the Digesters are placed in lift stations. Here, we must take consideration of several additional factors, mainly the distance from the waste treatment plant, and, of course, the size of the lift station and where the situs of delivery is - that is, is it a forced main, a secondary station, or is it a gravity-feed to the waste treatment plant? The reason that this must all be carefully considered is that we want to treat the waste stream and not adversely impact the treatment system by wantonly killing off essential microorganisms in the process.

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