Pressing Onward: A Dewatering Blog

Filter Presses & Groundwater Remediation

By Michael Stock

 

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Contaminated groundwater - that's not something we like to hear about here at Evoqua. Unfortunately, contamination happens all too often because of things like leaking storage tanks and improper chemical disposal practices that release contaminants. Some common contaminants include; petroleum hydrocarbons such as gasoline, jet fuel, and VOC’s (volatile organic compounds) such as trichloroethylene, xylene, and toluene. But never fear, groundwater remediation can help!

The groundwater remediation process is designed to prevent the further spread of the contamination and to remove these volatile contaminants. Let's take a look at the process (and the role that filter presses play).

 

About the Process...

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First, extraction wells are drilled around the perimeter of the contaminated area and the water is pumped out for processing using an air stripper, which is used to remove the VOC’s and petroleum hydrocarbons from the contaminated water.

But before going to the air stripper, any iron must be removed to prevent fouling of the air stripping column. Iron may be removed by converting the soluble iron to the hydroxide form.

From there, the water either goes to the air stripper or a sludge holding tank and on to a filter press. A small amount of conditioning chemicals may be required to produce quality filter cakes.

We recommend placing the filter press in a centralized location with easy access to the sludge holding tank injection wells (so the treated water can easily be added back to ground water supply).

 

About the Presses...

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Filter presses are an important piece of equipment in the remediation process. With frames made of heavy duty carbon steel plate and wetted parts made of polypropylene with PVC, carbon steel or stainless steel piping manifold, our presses can handle any challenge. The presses are very versatile and can adapt to changing operating conditions during the remediation and clean-up.

When it comes to treating large amounts of contaminated water, nothing beats a filter press. Depending on the size and model, our filter presses can dewater 25 - 1,000,000 gallons per day. Filter presses also produce higher solids cakes than other dewatering solutions, the J- Press® filter press by JWI® can capture up 98% of the solids in the wastewater.

 

Treating water as a part of groundwater remediation, it's just one of the many uses of our extremely versatile filter presses. Interested in learning more about what they do to help with your dewatering needs? Then download our guide or contact one of our product experts!

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