When released into the environment untreated, edible oil refinery effluent is regarded as the most dangerous waste. The effluent from edible oils is a yellowish liquid with high levels of dissolved solids, oil and grease, high COD and BOD values, low pH, and high levels of total phosphorus, ammonia nitrogen, and Kjeldahl nitrogen.
There are several effluent standards before releasing the effluent from the edible oil refinery into the water. These guidelines are put forward by CPCB. Let’s discuss these in detail.
Sources of wastewater in the edible oil refineries
Wastewaters in the edible oil business are mostly produced during the degumming, de-acidification, deodorization, and neutralization processes. The production of sodium salts of free fatty acids (soap stocks), during the neutralisation step results in the production of extremely acidic and oily wastewaters, which are then divided using H2SO4.
Its features are mostly determined by the kind of oil processed and the method used, which are high in COD, oil and grease, sulphate, and phosphate content, resulting in both high inorganic loading and organic loading, of the relevant wastewater treatment works.
CPCB guidelines for effluent standards in the ETPs of edible oil refinery
Oil & grease
<5oC above ambient temperature of the recipient water body
Wastewater Discharge from edible oil refineries
(i) Solvent extraction @ 2.0 cum/tonne of product (oil)
(ii) Refinery/Vanaspati @ 2.0 cum/tonne of product (refined oil/Vanaspati)
(iii)Integrated unit @ 4.0 cum/tonne of refined extraction & refinery/ Vanaspati product
(iv) Barometric cooling @ 15.0 cum/tonne of refined water/De-odoriser oil/vanaspati
Wastewater from processing and cooling shall be subject to the aforementioned requirements.
(i) If the recipient fresh water body is a source of drinking water supply, BOD must be strict up to 30 mg/l.
(ii) The boiler emission standards outlined in Schedule I rules must be followed.
CHEMICAL AND BIOLOGICAL treatment of edible oil effluent
The effluents from edible oils can be handled chemically or biologically separately or together.
Chemical treatment issues include rising chemical handling expenses, and the creation of difficult-to-treat and-dispose-of chemical sludge.
In the treatment of edible oil effluent, biological treatment methods provide a quick and affordable alternative, to chemical treatment methods. Wastewater from edible oil production could be biologically treated, using a sequencing batch reactor and the conventional activated sludge process.
· High organic loading and biodegradable chemical waste streams are treated, using the activated sludge technique.
· A modified version of the activated sludge process that has been used to successfully treat the wastewater, from edible oil refineries is the sequencing batch reactor.
SBR technology's benefits include its single-tank architecture, ease of expansion, and operational flexibility, control over the microbial population, ease of operation at low retention times, and different reactor configuration
Edible Oil refinery’s ETP Caution Board
Proper safety procedures and cautionary notice should be displayed at the ETP locations. "Danger" Sign Boards ought to be placed at the ETP for the benefit of maintenance workers, and the general public. Additionally, taps that dispense effluent water should highlight the phrase "water not suitable for drinking."
Due to the high organic composition of the wastewater produced by oil refineries, it poses a major threat to aquatic life. Therefore, it must be treated before being disposed of. The effluent's organic composition and the conditions surrounding its release, determine the treatment strategy.
Effluent Treatment Plant manufacturers for edible oil refineries
Netsol Water provides the best water and wastewater treatment in India, thanks to its numerous installations in various sectors. We create an effluent treatment system that is unique to each need. For the greatest technologies and solutions for specialized industries, you can rely on us.
We provide first-rate effluent treatment and recycling technology that change, to meet our customers' changing needs.