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Electrocoagulation Trial Results

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The Case Study CS068 provides a table of EC trials run on a broad range of effluents with analysis of the raw and treated water.  The table provides a good insight into the various contaminants that can be successfully reduced / removed by electrochemical treatment.

An understanding of the capabilities of EC may be well known to many readers of this page however, some readers may well have tried EC systems and encountered a common problem with most of the systems available on the market and that is metal plate passivation (development of an oxide layer on the plates/electrodes) which acts as an insulator preventing the cells from continuing to operate effectively.

The longer the passivation is allowed to accumulate, the less effective the system becomes.  Our system is designed to prevent plate passivation and also to operate effectively in low conductivity effluent thereby providing continuous high performance.


View our CS068 Electrocoagulation Trial Results

Treatment of Platform Wastewater

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For more information on electrocoagulation please see Technical Data Sheet TDS801

An oil and gas waste management company had been awarded a contract to manage the onshore treatment and disposal of wastewater from a number of drilling platforms. The wastewater included acetic acid arising from platform cleaning and well stimulation, which was a principal cause of the COD (chemical oxygen demand) of the water. Acetic acid cannot be removed by oxidation or chemical precipitation.

However, the company did not have the space to install conventional wastewater treatment plant, including a biological treatment with an activated sludge bed to remove the acetic acid, which it would have needed to meet the requirements of its discharge permit.

A two-stage electrocoagulation system was supplied to remove solids, heavy metal and emulsified/dissolved hydrocarbons from the wastewater with dissolved gas flotation/ sedimentation tanks after each electrocoagulation cell. A membrane filtration system was included to remove the acetic acid from the water after electrocoagulation in order to meet discharge limits.

The wastewater contained a high level of suspended solids, which were completely removed, as shown by the samples taken at, before and after each electrocoagulation cell.

Photograph shows:

0 = original water and 4 = final result. The COD was reduced to 5,200 mg/Kg by electrocoagulation and analysis confirmed that 95% of this was caused by acetic acid.

After the processing through the membrane filtration system, the COD was reduced to 1,250 mg/Kg and well under the COD limit for discharge.

InPro Systems' electrocoagulation systems contain a number of innovative design features and benefits for effective and continuous operation: