WATER TREATMENT & FILTRATION TECHNOLOGIES

From Difficult Solids to Fresh Water

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Riveer specializes in getting your equipment clean. Whether that equipment is a fleet of planes, construction equipment, or salt trucks, we will find the right solution for your unique situation. Beyond just cleaning your equipment of mud, grime and chemicals, it’s important to remove that waste in an environmentally responsible manner. That means knowing what to do with that mud and grime once it’s off of your equipment.

In addition, Riveer implements water reclamation technology whenever possible to conserve fresh water and cut down on costs for your application. However, when this method is used, the water used to clean your equipment will absorb the contaminants on your equipment as it comes in contact with them. So before that water can be reused, it must be filtered and purified.

Facing these challenges, Riveer implements a number of water treatment solutions. Different technologies are utilized depending on the parameters of each unique situation. When large amounts of suspended solids need to be dealt with, settling chambers or spin down systems should be used. Coalescing, skimming, and aerobic microbial treatments can be used to deal with oil contamination. Reverse Osmosis (RO), micron filtration, and ultra filtration can be used to eliminate dissolved particles, and Ozonation can be introduced for odor control by eliminating unwanted bacteria.

Your Riveer sales technician will advise you on what technology is appropriate for your application. With a carefully tailored Riveer water reclamation system, you can be sure your water will be clean every time you need to wash.

Riveer water treatment and filtration technologies include:

  • Mechanical Liquid/Solid Separation
  • Settling
  • Coalescing
  • Oil skimming
  • Ozonation
  • Micron filtration
  • Nominal
  • Absolute
  • Carbon
  • Ultra filtration, Nano filtration, Reverse Osmosis
  • Aerobic bacteria
  • Evaporation

Riveer Water Treatment and Filtration Process

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Mechanical Liquid/Solid Separation

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.

Settling

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. Generally the most economical is to provide a settling chamber where solids can be 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 separation is another common technique that speeds the settling process. In a spin down system, centrifugal force is used to simulate gravity which forces the particles that are heavier than water out of the waste stream. Spin down separators are ideal for filtering out coarse sediment without the need for cartridge replacement.

Oil Coalescing and Skimming

 

Coalescing is a process that brings oil to the surface of the waste stream. By passing wastewater 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 using the same oleophilic technology that coalescing used to bring it to the surface. Because the oil is more attracted to the material of the belt than the water, it grabs on to the belt as it passes through the water and is scraped off into a reservoir that can be easily drained.

A properly designed system will collect and trap oil in a location where it can be skimmed. We use a wall at the end of the coalescing chamber that the water is forced to pass under rather than over. This technique, known as an oil weir, captures all floating oil and other floating contaminants on the upstream side of this wall. This is the most efficient location for an oil skimmer to be placed.

Ozonation

Ozone (O3) has been recognized by the USDA as being more effective at killing bacteria than chlorine. When using ozonation to purify water, we inject it all through the system which succeeds in eliminated odor and breaking down soaps. This is an entirely automated process that generates ozone electronically with a Corona Discharge generator.

Beyond eliminating odor and breaking down soaps, ozonation has a number of other advantages. Ozone 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.

Micron Filtration

Nominal

After screening and settling solids out, wastewater is processed through the first step of Micron Filtration, which is the nominal filtration stage. At Riveer we generally employ at least one high-pressure media filter. This filter holds 7 cubic feet of media and we typically load it with a mixture of fine gravel, sand and Zeolite. These filters require little maintenance, all that is required for cleaning is a simple backwashing. The vertical high-pressure vessels we use for moderate to heavy mud loads are unbeatable for solids reduction.

 

Absolute

After processing the wastewater through nominal filtration we take the extra step of going through absolute filtration. Where the nominal filter will allow particles to bypass the absolute will not. A 10-micron absolute filter by definition will not allow any particles large than 10-micron to pass. This level of filtration yields an unprecedented level of water clarity. When this filter becomes full, it shuts the system down. Because down stream high-pressure pumps are expensive and intolerant to solids, the vast majority of Riveer filtration systems have at least one absolute filter.

Ultra filtration, Nano filtration, Reverse Osmosis

These filters all employ the same membrane filter technology, the difference between them being in the varying tightness of their cells. Ultra filtration can be used effectively to remove water-soluble oils from a waste stream. Nano filtration has proven effective at removing pesticides and Reverse Osmosis (RO) removes all salts, soaps and heavy metals. These filters are relatively expensive to purchase and operate. However, their unbeatable effectiveness is worth the investment.

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 to required washing specifications for aircraft cleaning.

Aerobic Bacteria

Anaerobic bacteria break down oil without oxygen (O2) being present. This process produces pungent gases and takes longer than processing oil with aerobic bacteria. Consuming oil with aerobic bacteria requires the presence of oxygen, and transforms oil waste into water, carbon dioxide (CO2) and energy. This method results in a more complete digestion of waste solids.

These aerobic bacteria work by breaking down the very structure of oil. Oil is made up of hydrocarbons, and the bacteria separate the carbon and hydrogen molecules in these structures by combining them with oxygen.

These systems are also sometimes known as “bug systems” and they have been growing in popularity. They can be very effective when used for the correct applications, but in many situations, a system that mechanically removes oil through the use of coalescing and skimming equipment will be much more effective. Mechanical systems are less costly overall and are far easier to maintain. If your Riveer sales technician advises you to incorporate a microbial system, you can rest assured that this decision will be made with your unique application in mind, not because microbial systems are a trendy option.

Evaporation

Evaporation can be employed when there is no economical way to dispose of excess wastewater. Forced evaporation is not very common in wash racks, as natural evaporation tends to carry away enough water that fresh make-up water is added frequently. However, all closed loop systems need to be drained and cleaned periodically and this is when water disposal becomes an issue.

When large quantities of water need to be evaporated quickly, a gas-powered evaporator is the best option. These can evaporate water at rates of a few gallons per hour to hundreds of gallons per hour, depending on size and power. In some instances more passive evaporators relying on solar energy can be used. Dark colored aerated tanks can effectively evaporate large quantities of wastewater.