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Alternative wc

Any waste particles or water collected in the coalescer are then filtered back into the holding tank for storage and separation. After leaving the coalescer the oil is passed through another filter, usually fullers earth, to remove any water not filtered out by the coalescer. Then the recirculated oil passes through a "chemical wash- which usually consists of hypochlorite. This is done to get rid of smells and pathogens. The last process after the chemical bath involves passing the oil through a carbon filter that removes non-water-borne dissolved pollutants. .
             To maximise the life expectancy of the filter and recirculating system the oil that is filtered from the holding tank must be as clean as possible with the fewest amounts of particles in as possible. The holding tank must be designed carefully to minimise stirring up and disturbance of the separation process when waste enters it. The angle of entry effects the velocity of the waste products into the tank and this is important when minimising disturbance. Ramps can also be used to minimise disturbance. The waste should enter the tank at the opposite end to which the oil is drawn of. Where the oil is drawn of the intake should be as high up in the tank as possible to reduce the amount of particles going into the filtration system. The capacity of a holding tank is approximately 50 cubic feet; the capacity of the holding tank should be approximately four times that of the filtration system.
             Case study.
             VDOT (Virginia Department of Transportation) installed a number of Oil Flush Toilets on an interstate highway and the results are as follows:.
             There have been many complaints of smell and discoloured flushing medium. DTH contract services, who are responsible for all the maintenance of the toilets say that Oil Recirculating Toilets require a high amount of maintenance. Due to the viscosity of the oil, problems occur in the pipes.


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  • Word Count: 1599
  • Approx Pages: 6
  • Grade Level: High School

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