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Free oil has droplet size of >20 micron. It naturally will float up and separate from water. You can speed it up with a coalescer. Once the oil float up, you can use skimmer (disc or belt) or overflow weir.
Grease & Oil removed by the first stage of treatment Grit removal basin we remove solid( wood , paper , tins , cloth ......etc) then Sand from the bottom of tha tank using deferent mechanism third stagg flooting grease & oil at the top of grit removal tanks using traveling bridges with adjustablr stanless steel ruber end scraber scrape the oil&grease to channel at tanke end to pipe to lower concete tanke which evacuwated by mobile tank to approved safe reservior
Oil/grease will be present in the water as droplets. Droplets smaller than20 micron are considered “emulsified”. Droplets larger than20 micron are considered “free”. Free oil can be seen floating on the surface of the water or as a sheen on the surface of the water.
Before selecting a treatment process, laboratory testing should be performed to determine the concentration of oil and suspended solids. Visual observation can indicate whether there appears to be significant amounts of free oil.
When oil concentration is high and the amount of fee oil appears to be small, the emulsified oil needs to be converted to free oil. This process is referred to as “emulsion breaking”.
Emulsions can be either chemical or mechanical. They can be broken by raising or lowering pH by adding polymers and/or by adding other emulsion breaking products. Jar testing and laboratory testing are important aids in identifying the best approach to breaking an emulsion.
When the wastewater contains a substantial concentration of free oil, an oil/water separator is often the first step in the treatment process.
If the water also contains suspended solids, a media filter will be the next step.
The emulsified oil remaining in the water can be reduced significantly by use of a clay filter.
The granular clay media works by adsorption so contact time is critical in achieving optimum results. A clay filter can be expected to remove more than90 percent of the oil. If further oil removal is required, a granular activated carbon filter will be effective.
If the initial oil concentration is100mg/l or less and it appears to be almost entirely emulsified, an oil/water separator is not required. In this circumstance, the first step in treatment is a media filter, followed by a clay filter and by an activated carbon filter if final polishing is required.
API oil seperator can be used to skim out the floating oil and for emulsified oil you can opt for Diffused Air Floatation (DAF) device.
By using Dissolved Air flotation Unit (DAF ) unit with skimmer & then Use a Settling tank To collect the residual oils by Cone shped collector & finally dump the collected oils into sludge tank ...
Oil Separation Unit or Oil Removal Unit including Oil skimmer
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