Mineral Oil, Fat Oil & Hazardous Wastewater Treatment & Recovery Plant

Current situation

Mineral & Vegetable oily wastewater including emulsions are considered extremely hard to purify.

They contain very high oil and solid loads which can be up to 100,000 mg/l of oil (10%) , up to 300,000 mg/l of solids (30%) and very high organic loads.

Waste is very viscous and dense and tend to clog all installations

Typical Sources -Current situation

Garage

Metal cutting oil industry

Petrol stations

Oil – water separators

Food industry (dairies, meat, chicken slaughterhouses)

Petrochemical industry and mineral oil tank farms

Sea and air Ports

Institutional kitchens, hotels , restaurants

Municipalities usually prevent these wastes from arriving to central municipal wastewater treatment plants, mainly since they simply kill the bacteria in the existing biological plants , and thus – permanently damage the plant.
These wastes usually arrive to the treatment area by sewage trucks which contain from 5 to 20 m3 of waste.

In the source were they are taken from they may “sit” in a pit for up to several months and therefore water content is deteriorating and oils and solids content are rising.

Our Technological Concept

Waste Reception ponds:
We separate mineral & vegetable wastes and mix each pond to prevent sedimentation
These ponds are divided to truck reception and pretreatment zones
Wastes are immediately monitored with on line instrumentation and segregated accordingly

Second stage centrifuge – Further Separates the oil from the water

At this stage – high purity oil is generated .The oil contains less than 1%of water.
Oil is stored and later sold to the industry
Selling prices are ranging from 30-50 Euro per m3 of oil.

Biological polishing process:

At this stage the load of COD (Chemical Oxygen Demand) is up to 5,000mg/l (we started at more than 100,000 mg/l), so we removed already around 95% of the COD !)

Oil level at this stage is around 10-50 mg/l and therefore poses no damage to the bacteria.

Still we need to further polish the COD level to less than 2,000 mg/l, which is required at the inlet of the municipal WWTP

The Biological process is based on SBR (Sequential Batch Reactor) and implements special bacteria and further reduce COD level to less than 2,000 mg/l