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Liquid Purification

Method-of-cleaning-boats-that-have-been-contaminated-with-oil-and-gas-well-drilling-fluids-and-hazardous-waste

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Method of cleaning boats that have been contaminated with oil and gas well drilling fluids and hazardous waste

Details

Inventors: Defraites, Jr., Arthur A.;
Assignee:
Primary Examiner: Snay; Jeffrey
Assistant Examiner:
Attorney, Agent or Firm: Garvey, Smith, Nehrbass & Doody, L.L.C.

A system for cleaning vessels that have been contaminated with oil field drilling and production waste materials such as oil well drilling fluid or hazardous waste using recycled wash water. As dirty wash water accumulates in a vessel during cleaning, it is transferred to a settlement section of the waste receiving barge. A cationic polymer is injected into the suction side of a waste water pump during transfer of dirty fluid from the vessel to the receiving barge. The polymers react with fluids to begin an initial settling process within the waste receiving barge. Decant water is subjected to secondary settlement and secondary chemical treatment after it leaves the primary settling section of the waste receiving barge. The laundered water is returned to the wash water storage facility for reusing and cleaning the same vessel or additional vessels. In this fashion, waste is continuously concentrated in the receiving vessel for ultimate disposal at a remote site and wash water is recycled for reuse.

DETAILED DESCRIPTION The present invention solves these problems and short comings of the prior art by using the barge that typically collects all of the waste water as a vessel for concentrating solid material in a recycling process that allows the wash water to be used again and again.
With the method of the present invention, various treatment stations remove solid material and oil from the wash water stream after a vessel has been cleaned.
Indeed, with the method of the present invention the receiving barge that functions as the first station of the treatment process will eventually be shipped to a disposal site.
Treatment stations that are positioned down stream of the receiving barge also treat the wash water before it can be recycled for cleaning a vessel.
At each of these stations, any waste material or hazardous waste that is removed from the wash water stream is transmitted to the receiving barge, again concentrating waste material for eventual disposal.
With the method of the present invention, multiple of the treatment stations can be land based and connected via pipe lines or like flow lines with the receiving barge which is typically floating adjacent the vessel to be cleaned.
Further, the wash water storage facility is preferably land based although it could also be a barge or a barge mounted tank.
This wash water storage facility contains an initial volume of wash water that is to be used in the cleaning of boats and receives treated wash water after it has been transmitted from the vessel to be cleaned to the receiving barge and then to the various treatment stations down stream of the treatment stations.
The method of the present invention thus provides an improved method and apparatus for cleaning vessels and the like that have been contaminated with oil and gas well drilling fluids such as drilling mud and hazardous waste.
The present invention first provides a laundered wash water storage facility for containing water to be used in cleaning of the boats.
The boat is then cleaned with wash water from the storage facility

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