April 28, 2018 / Pat Sears

Transporting High Percent Solids Waste Fuels

Key points

  • Various challenges, with one of the most difficult being the benzene content of the material.
  • Tanker trailer with an internal agitation system (Roberoller™) was used.
  • Download Case Study: Transporting High Percent Solids Waste Fuels - PDF

Company Profile

Middle America Refining operates the 126,000 barrels-per day refinery in St. Genny, MO. The refinery, which sits on a 450 plus acre site, produces nearly 8% of the gasoline made in the US. The refinery, which processes both sweet and sour crude oils supplied primarily by pipeline, is a major producer of asphalt, diesel, jet fuel, petrochemicals, propane, and lube oils.

 

Business Situation
Middle America Refining Tank 1222 was due for API inspection and repair. This tank had approximately 220,000 gallons of product and heavy sludge remaining in the tank. STC Industrial was engaged to assist in the removal, transportation and disposal of the remaining contents of Tank 1222.

STC Industrial was engaged due to its patented technology for the removal, on-site blending and agitated transportation of high percent solids liquid. STC Industrial owns several patents and has several patents pending for the on-site blending and transportation of Hazardous Waste Derived Fuel (HWDF) which is incinerated as a recycled fuel for cement production at various cement kilns throughout the United States.

 

Technical Situation
Tank 1222 possessed a very high benzene content which presented challenges for emissions controls and employee exposure. Tank 1222 also had a high solids content within the remaining material in the tank which presented both transportation and disposal challenges.

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Proven, proprietary technology that maximizes payload

Solution

The cleaning of Tank 1222 presented various challenges with one of the most challenging being the benzene content of the material. Because of the elevated benzene content the emissions from this tank had to be captured and the air scrubbed prior to release to the atmosphere. Due to this requirement a system had to be put in place to scrub the air. A carbon canister system was provided at the beginning of the job but due to the high volume of air produced during the vacuum extraction the carbon system was not sufficient and a suitable system was not available.

A pumping system was provided to replace the vacuum system that was used for the solids extraction. This system was sufficient to remove the solids however it was slower and seemed to produce more disposal material.

In order to manage the transportation of the high percent solids liquids challenge a tanker trailer with an internal agitation system (Roberoller™) was used. This system uses a full length, totally submerged, paddle wheel system that is powered by an externally mounted power source. This system is powered by a diesel engine that powers the unit’s agitation system from the time the tanker is loaded until it is off loaded. This system allows for a “RCRA” empty tanker each time the tanker is off loaded even though the solids content of the liquids can reach 60+%.

The high percentage solids liquid mentioned above was disposed of through the use of incineration at various cement kilns throughout the United States. These kilns can accept high percent solids liquid and can accept most RCRA hazardous waste codes. Cement kiln disposal offers advantages over other methods of destruction. These include the following: 100% destruction without ash - When the material is thermally destroyed at the cement kiln, the chemical decomposition takes place inside the kiln, which is equipped to handle the off-gases. Each kiln is designed with specific engineering on the pollution control equipment ensuring compliance with EPA regulations and air permits. The process of thermal destruction, via the cement kiln industry, ensures that "NO ASH" is generated for landfill disposal. The material that is not thermally destroyed through the burning process, becomes part of the cement matrix, and is encapsulated chemically as part of the Klinker (Cement). This process is a 100% green option. Because the HWDF is an alternative to coal, natural gas or other purchased fuels the cement kiln option is less costly than other methods that do not benefit from the waste disposal.

 

Products/Services Used/Provided By STC Industrial

1. CleanBore Blending Unit

2. Roberoller agitated tankers

3. Cement Kiln(s) for disposal

 

Services provided by others

1. Pumping system to extract the material from the tank

2. Carbon filtration system

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Learn more about Roberoller and our additional technology

Our Services

We offer an all-inclusive turnkey price.
If we don't get loads out of the gate, we don't get paid.

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Extract, Transport, Waste to Fuel is our turnkey value proposition, priced per pound

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Proprietary blending technology that eliminates centrifuging

icon-transport-round

Proven, proprietary technology that maximizes payload

icon-waste-fuel-round

100% thermal destruction with no residual ash going into landfills

Our Services

We offer an all-inclusive turnkey price.
If we don't get loads out of the gate, we don't get paid.

icon-services-round

Extract, Transport, Waste to Fuel is our turnkey value proposition, priced per pound

icon-extract-round

Proprietary blending technology that eliminates centrifuging

icon-transport-round

Proven, proprietary technology that maximizes payload

icon-waste-fuel-round

100% thermal destruction with no residual ash going into landfills