Effluent Water COD Reduction

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Industrial refinery

Cut the COD of solvent-laden effluent by over 99%: solvents are air-stripped from the water, concentrated and recovered with a Genosorb® plant.

Discuss Your Effluent Stream
95–99.9%Recovery efficiency
45 YrsProcess Engr. Exp
50+Industrial sites studied
500×Pilot to commercial

11 · Effluent Water — COD Reduction

Solvents in the effluent stream

Effluent waters generated from many synthetic organic chemical production processes have high COD content. The COD content is mainly due to high concentrations of solvents in the effluent stream.

The solvents are stripped with air giving a low-concentration VOC stream, that is fed to a Genosorb plant or rotary concentrator and the solvents recovered. The gases coming from the concentrator can also be incinerated at a low cost. High air volumes are needed for efficient stripping.

Efficient recovery is possible using a rotary concentrator followed by a Genosorb plant.

Pilot solvents tested

7

different solvents

COD reduction

>99.5%

in pilot runs

COD of the effluent

200,000<1,000

before → after Genosorb® treatment

How the solvents are recovered

  1. 01

    High-COD effluent

    Water from synthetic organic chemical processes carries solvents in high concentration — the cause of its high COD.

  2. 02

    Air stripping

    The solvents are stripped from the water with air, giving a low-concentration VOC stream. High air volumes are needed for efficient stripping.

  3. 03

    Rotary concentrator

    Raises the VOC concentration. Its exhaust gas can also be incinerated at a low cost.

  4. 04

    Genosorb® plant

    Absorbs, strips and condenses the concentrated stream, returning the solvents as recovered liquid product.

Efficient recovery is possible using a rotary concentrator followed by a Genosorb® plant. Share your effluent’s solvents, flow and COD and CCDC will assess what can be recovered.

Request a Feasibility StudyHow the rotary concentrator works