Wash Water Recycling Systems

Closed-loop water treatment systems are designed to recycle or reclaim wash water from above-ground wash racks, in-ground sumps, skid steer troughs, or trench drains.

The zero discharge process allows for environmentally safe cleaning by using simple filtration processes that are included in most wash rack systems: liquid-solid separation, oil coalescing, oil skimming, ozone injection, micro and absolute filtration and more.

You can use your own pressure washer with the treatment systems. Not only can the system be used for equipment washing and corrosion control, but it can also save powder coaters tens of thousands of dollars by recycling phosphate pre-treatment chemicals.

Whether you are deducing equipment, degreasing equipment or acid washing parts, treatment systems can save you time and money while avoiding EPA fines.

Wash racks and recycling systems from manufacturers are available in many configurations. Filtration system range in size, throughput and material processes, and can be designed to handle heavier mud loads.
Mud is the enemy of all filtration systems and providing a logical approach to dealing with mud is the hallmark of recycling systems. Not everyone is washing earth movers but everyone has some dirt, so make sure yours system is designed to meet your needs, whatever they may be.

Wash Rack Recovery Through Mechanical Liquid/Solid Separation and Filtration

Solids Conveying

Field installations, construction sites, mining and other heavy duty applications often require mechanical liquid/solid separation systems as upstream process prior to settling, filtration and treatment.?Solids are diverted from treatment systems before they overwhelm filtration.

The solids can be dragged from the rack and dumped into a filter-lined hopper, where moisture from the mud is naturally drained, leaving a lighter, less costly load to be disposed.


In applications where there is a large volume of suspended solids in the waste stream, settling can play a large and efficient role in the filtration process. Settling can be achieved several ways, such as a settling chamber where solids are allowed to sink out of the water.

If time or space doesn’t allow for natural gravity settling, spin down separation can be used as an alternative. Spin down separators are ideal for filtering out coarse sediment without the need for cartridge replacement.

Oil Coalescing and Skimming

By passing wash water through an oleophilic medium, small oil droplets grow to the point that their inherent buoyancy causes them to rise to the surface. Floating oil can then be skimmed off the surface by a belt or disk as it passes through the water and is scraped off into a reservoir that can be easily drained.


Ozone (O3) is recognized by the USDA more effective than chlorine at killing bacteria. The optimum process is injecting ozonation through the system eliminates odor and breaking down soaps.

Beyond eliminating odor and breaking down soaps, ozonation reduces oxygen demanding matter, turbidity and surfactants, removes most colors, phenolics and cyanides, increases dissolved oxygen levels, produces no significant toxic side products, and aids in the reduction of suspended solids.

Micro Filtration

Nominal Filtration

After screening and settling solids out, wastewater can be processed through a nominal filtration stage. Typically loaded with a mixture of fine gravel, sand and Zeolite, these filters require little maintenance, and are excellent for moderate to heavy mud solids reduction.

Absolute Filtration

Where the nominal filter will allow particles to bypass, a 10-micron absolute filter, for example, will not allow any particles large than 10-micron to pass. This level of filtration yields an unprecedented level of water clarity and helps extend the life of down stream high-pressure pumps typically intolerant to solids.

Ultra Filtration and Nano Filtration

Ultra filtration can effectively remove water-soluble oils from a waste stream. Nano filtration has proven effective at removing pesticides. These filters are relatively expensive to purchase and operate. However, their effectiveness is often worth the investment.

Reverse Osmosis

For salt truck washing where water supplies and disposal are difficult, RO can be an integral part of the solution. An RO system works by passing water through a semipermeable membrane that separates any dissolved solids from the water.

In tool washing applications where synthetic high temperature oils are used, ultra filtration can be very effective. These filters are also used to purify incoming water.