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Sewage & Effluent Treatment

Electrocoagulation

Electrochemical treatment that destabilises pollutants using sacrificial metal electrodes — no bulk chemical dosing.

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Working principle

A DC current is passed through aluminium or iron electrodes immersed in the wastewater. The electrodes release coagulant ions in situ, which destabilise suspended solids, emulsified oils and heavy metals.

The destabilised pollutants form flocs that are removed by flotation or settling. The process replaces bulk coagulant chemicals, produces less sludge and handles loads conventional biology finds difficult — colour, oil & grease and metals.

STEP 1
Feed conditioning

pH trim and flow equalisation of the feed.

STEP 2
Electrolysis

Sacrificial electrodes release coagulant ions.

STEP 3
Flocculation

Pollutants bind into flocs; micro-bubbles float them.

STEP 4
Separation

Flocs skimmed or settled; clear water polished.

Process diagram

Effluent
inlet
EQ & pH trim
feed conditioning
EC cell
sacrificial electrodes, DC
Flocculation
flocs form & float
Separation
skimming / settling
Clear water
to polishing

Electrode ions replace bulk coagulant chemicals.

Applications

Textile & dyeing Oil & grease streams Electroplating & metals Dairy effluent Laundry wastewater CETP pre-treatment

Advantages

No bulk chemical coagulant dosing
Removes heavy metals, colour and emulsified oil
Compact skid-mounted units
Lower sludge volume than chemical coagulation
Fast response to load changes
Easy to automate

Typical specifications

Parameter
Typical value
Capacity range
1 KLD – 500 KLD
Electrodes
Aluminium / iron, sacrificial
Power supply
DC rectifier with polarity reversal
Removes
Colour, O&G, TSS, heavy metals
Sludge
30 – 50% less than chemical dosing
Construction
SS / MSEP skid
Automation
Rectifier + PLC control

Final specifications are engineered per site after requirement study.

See it working

An electrocoagulation skid treating effluent.

Related: MBR SBR MBBR ETP

Difficult effluent? Ask us if electrocoagulation fits.

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