Treatment of industrial oily wastewater

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

undefinedUltrafilter for oil separation


Free and so-called “soluble” (emulsified) oils, as well as heavy metals, can be separated from waste streams very effectively using membrane separation. Membrane separation is used based on its ability to selectively remove contaminants and produce a waste stream that is suitable for disposal to sanitary sewer or, in some cases, for reuse. The system operates by concentrating 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.


System Design

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.


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.


The Dynatec Difference

Significant Savings

  • Waste stream concentration lowers disposal fees
  • System requires no chemical treatment
  • Continuous operation minimizes labor requirement
  • Easy maintenance reduces labor costs


Technology Benefits

Membrane Separation System Using Tubular Ultrafilters (UF)

  • Simple mechanical process 
  • Consistent high quality water
  • Ability to reuse purified water
  • Low operating costs
  • Unattended operation
  • Minimal disposal costs


Contaminants Removed

  • Emulsified oils
  • Polymers
  • Machine Lubricants
  • Heavy Metals


Services Provided

  • Systems Design
  • Equipment and Installation
  • Operator Training
  • Maintenance Contract


Information Sheets

Industrial Oily Wastewater.pdf
Industrial Oily Wastewater
pdf (558.61kb)