Venturi Aeration, Inc.

Aerobic Digestion of Sludge Using the Venturi Aeration Oxygenator Process

OVERVIEW:

The Venturi-Aeration Aerobic Digestion System is a vastly improved method of stabilizing sludges that accumulate in both municipal and industrial wastewater treatment plants. The principal advantages of the Venturi-aeration Sludge Digestion system are:

·It is capable of handling raw anaerobic sludge as well as aerobic sludge without upsetting the aerobic bacteriological process.

· No air compressors are required, eliminating costly maintenance of compressor and blower.

· There are no air diffusers to plug.

· There are no expensive chemicals required for sludge stabilization.

· Produces a Stabilized Sludge ideal for agricultural land applications.

· All Components of the Venturi-aeration system are external to the digester vessel for ease of maintenance.

· Superior odor reduction capability.

· Reductions in BOD, COD, VSS due to high dissolved oxygen transfer.

· Hydraulic shear effect which produces high surface area of organics to enhance digestion.

· Stripping of substances with weak Henry’s Constants to aid in reducing VSS.

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Alum Sludge Residuals Dewatering

Venturi Aeration, Inc. developed an innovative application for the AutoVac rotary vacuum drum to dewater alum sludge residuals. The Town of Tewksbury, MA uses alum (aluminum sulfate) to floc and settle organics and turbidity from 3.5 mgd of water it draws from the Merrimack River daily. The Tewksbury WTP had been disposing of the alum sludge residuals through a pipe connected to the Lowell Regional WWTP. When the Lowell RWWTP exceeded the parameter for aluminum in their own effluent discharge into the Merrimack River they contacted those source dischargers that had aluminum in their wastewater and told them to cease and desist with their discharge of aluminum- containing wastewater. This is when the Town of Tewksbury began to look for disposal alternatives for its alum sludge residuals.

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Non-chemical pH Adjustment, Corrosion Control, Radon Removal, and VOC Stripping

Summary: Performance data has been obtained, from pilot studies and full-scale treatment systems, that demonstrate the effectiveness of the venturi-aeration process in reducing the corrosivity of potable water by stripping corrosive carbon dioxide (CO2). pH values were raised significantly by aeration alone, while alkalinity levels remained constant. Hydroxides or lime addition were minimized and even eliminated. Radon and VOCs (i.e., PCE and TCE) were also removed, thereby addressing several health risks simultaneously in a point-of-use (POU) drinking water system.

The heart of this non-chemical corrosion control process is a compact venturi aeration aspirator that produces such high shear that carbon dioxide (CO2), radon, VOCs (and methane), are readily stripped from the water in fractions of a second. Since the percentage removal per pass for any given contaminant has been determined in pilot studies, the number of passes to achieve any desired pH goal can be readily determined by a computer model, availible to you.

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