RAVVA

Celebrating 16 Years of Technical Excellence

Effluent Treatment Plant

Ravva – Pioneering Development Production | Operations Effluent Treatment Plant

An API oil-water separator is a device designed to separate oil and suspended solids from the wastewater effluents. The name is derived from the fact that such separators are designed according to standards published by the American Petroleum Institute (API). The Ravva JV installed an Effluent Treatment Plant (ETP) in Ravva to treat the effluents from the plant area through API separator. The Ravva ETP is designed to treat 20,000 barrels of effulent per day coming from different areas of the plant. The plant was commissioned in July 2002 and installed to achieve very low oil in water content in the effluent and suspended solids removal. The plant also maintains the Biochemical Oxygen Demand (BOD) in the effluent water. The ETP consists of a number of steps including primary and secondary clarifiers, dissolved air flotation units, pressure sand filters, and dual media filters. A number of chemicals are used at various stages to support the treatment process. The treated water discharges through a marine outfall line to a point approximately 500 m from the shore. The solid sludge generated in the ETP is periodically centrifuged and sent for disposal through hazardous waste management.

The plant has the following process sections: Primary treatment

Physio-Chemical treatment - processing of waste water, toxic substances or other materials involving a combination of physical and chemical methods

Flocculation - a process where colloids come out of suspension in the form of floc or flakes

Dissolved Air Floatation - a water treatment process that clarifies wastewater (or other waters) by the removal of suspended matter such as oil or solids

Pressure Sand Filters – such filters are used for separating water suspended solids

Secondary Treatment (Biological section)

Aeration tanks - fluid-holding tanks with provisions to aerate its contents by bubbling air

Clarifiers – are used for solid settling. Polishing Unit

Dual media filters – these filters use two layers of separators for improved particle size removal

Disposal

Treated effluent discharge - where the treated effluent is not reused but is disposed in the sea through the sea fall line.