Water containing traces of oil is cleaned by passing through a porous bed containing oleophilic bodies and oil imbibing bodies. Oil is collected on the surface of the oleophilic bodies and removed from the oleophilic bodies by the oil imbibing bodies. Such beds have a high capacity for oil retention while maintaining separating efficiency.
The containment system provides a simple but automatic closure device that requires minimum and low cost maintenance. Storm water can pass through the drains and does not require manual pumping like the prior art systems. Small mounts of contaminants will be absorbed as the water passes through the drain ensuring the storm water leaving the containment area is free of contaminants. Hydrophobic swellable polymer particles are located in the drain to seal the drain in the event that organic liquids such as oil, gasoline, etc. flow into the drain.
A method for the use of a porous, preferably dimensionally stable, particulate material in a packed filter bed for separating a disperse liquid phase from a gas and/or separating a disperse liquid phase from a liquid, with the average size of the particles being in the range of from 0.1 to 10 mm and the internal surface area of the material being such that, after it has been filled with the disperse liquid phase to be separated and placed, as a packed bed, at a distance of from R to r from the center in a centrifuge rotating at an angular velocity w, for which it holds that wherein w stands for the angular velocity (in rad/s) and R and r represent the largest and the smallest radius (in m), respectively, of the material in the centrifuge, at least 1% of the liquid will have been separated after 5 minutes, while at least 10% of the liquid will have been separated after 60 minutes is disclosed.
Oil-absorbent compositions are disclosed. The compositions are crosslinked interpolymers of an alkylated styrene and a rubber. The compositions of the invention have high absorption capacities and absorption rates compared with prior-art compositions.
Compositions useful for absorbing oil from the surface of oil contaminated water, or land, constituted of a particulate admixture of wood fiber, preferably in concentration ranging about 20 to 70 wt. %, and hydrophobic, organophilic water wettable cotton linters, preferably in concentration ranging from about 80 to 30 wt. %. The compositions can be spread upon the oil contaminated water, or land, to absorb the oil, and the oil contaminated compositions then swept up or otherwise removed, and disposed of to leave the water or land surface cleansed of oil.
The present invention is a method of using crumb rubber from recycled tires as a filter media. The use of crumb rubber as a media differs from conventional sand or anthracite filters in several ways. The crumb rubber media is compressible which allows the porosity between rubber particles to decrease through the filter bed. The crumb rubber media compresses as headloss increases, allowing for better effluent quality late in the run. The crumb rubber media allows greater depth filtration. The crumb rubber media can be used at high filter rates, greater than 20 gpm/ft.sup.2. The crumb rubber media performs similarly to other traditional filter media in respect to turbidity and total suspended solids removal. The crumb rubber media properties are closely tied to media size and shape, with smaller media providing better effluent qualities and larger media allowing longer filter runs at higher flow rates.
