Oily Wastewater Treatment and Recovery

Dynatec offers ultrafiltration to remove free and so-called “soluble” (emulsified) oils, as well as heavy metals from waste streams.

Ultrafilter for oil separation

Significant Savings

  • Continous unattended operation reduces labor
  • Consistent high quality water
  • Ability to reuse water
  • Minimal disposal costs
  • Lowers disposal fees
  • System requires no chemical treatment

Contaminants Removed

  • Emulsified oils
  • Polymers
  • Machine Lubricants
  • Heavy Metals

System Design

Dynatec offers a system to concentrate the oily emulsion, reducing disposal costs. When heavy metals are present, the waste is pretreated to precipitate the metals prior to the membrane filter, which then removes the metals.

Any free oil that is present is first removed usually through the use of a coalescing oil/water separator. When metals must be removed, the waste passes through a pretreatment system to precipitate the metals. The waste is then transferred to a process (feed) tank ahead of the membrane system, in this case, a tubular ultrafiltration system. No oil can pass the membrane, only materials in solution in the aqueous stream such as surfactants. The treated fluid is known as “permeate”. The permeate is normally suitable for discharge or reuse without further treatment.

The concentrate (reject) is periodically discharged from the process tank and is normally disposed of to an oil recovery company.

oily wastewater ultrafiltration process

Simple Mechanical Process

The membrane filter is a mechanical system that allows clean water to pass, which the contaminants are retained and returned to the waste holding tank. There are no chemicals used other than those used to adjust pH and/or precipitate metals. The levels of waste material for disposal are much lower than conventional physical/chemical waste processes. The system simply separates and concentrates the contaminants in the wastewater, which are then disposed of.

Unattended Operation

Since the process does not rely on coagulation and flocculation, continuous operator control is not needed. The system is completely mechanical and can be left unattended for long periods without operator intervention.

Consistent High Quality Water

The membrane filter forms a positive barrier to the flow of contaminants producing continuous high quality water without operator attention. The membrane system is not affected by variability on the waste stream. The purified water is suitable for reuse or sewer discharge.

Document downloads

Industrial Oily Wastewater.pdf
Industrial Oily Wastewater.pdf
pdf (558.61kb)
Contract Service.pdf
Contract Service.pdf
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Containerized Membrane System.pdf
Containerized Membrane System.pdf
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Containerized MBR.pdf
Containerized MBR.pdf
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HiRate MBR.pdf
HiRate MBR.pdf
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Ultrafiltration.pdf
Ultrafiltration.pdf
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