Cleaning solution to remove hydrocarbons from a substrate

Details Cleaning solution to remove hydrocarbons from a substrate Cleaning solution to remove hydrocarbons from a substrate

2001-10-16

2002-11-05

Carrillo, Sharidan (Department: 1746)

Cleaning and liquid contact with solids

Processes

For metallic, siliceous, or calcareous basework, including...

C134S036000, C134S042000, C435S264000, C510S493000, C510S495000

Reexamination Certificate

active

06475290

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a cleaning or washing solution and to a method of cleaning or washing hydrocarbon based material from a substrate.
BACKGROUND OF THE INVENTION
Solvents are widely used in various automotive and industrial parts washing equipment. As such, petroleum based solvents and even ordinary aqueous cleaners require periodic disposal of the contaminated solution by expensive hazardous waste hauling services. In turn, these services are required to treat the contaminated solution. It has been proposed in the art to use organic microbial cleaning solutions to replace such solvents and aqueous cleaning solutions. However, the cost of doing so has been substantial and accordingly, the process has not gained a wide degree of acceptance to date.
The use of microbes for the microbial degradation of hydrocarbons by treating the same with particular microorganisms which are capable of using the hydrocarbon as an energy and carbon source is well known in the art. The process has been used to clean up oil spillage as it has occurred on various waterways. It is also being used for the cleaning of oil transport vessels and/or storage tanks. However, the process is relatively expensive to practice.
Many different types of hydrocarbons are utilized in different industrial applications. Hydrocarbons are generally derived from petroleum based materials and are a complex mixture of straight chain and branched alkanes or alkenes, saturated ring compounds and aromatic compounds. Industrial hydrocarbon products include gasoline, kerosene, burner fuel oil, diesel oil, gas turbine oil, aviation fuels, lubricating oils and hydrocarbon greases. As will be appreciated, such products have a widespread use and it is frequently necessary to clean up spills or other contamination of a substrate by such hydrocarbon products.
In the art, various methods for cleaning hydrocarbon contaminated substrates have been proposed. These include the physical removal of the product by use of absorption media, dispersal detergents, microbial degradation, agglomeration, and the use of organic chemicals.
For many years, hydrocarbon contamination was not considered a problem and the procedure for controlling environmental damage was to ship the undesirable contaminants to a secure landfill. However, this is no longer an option in environmentally sensitive areas and many countries and other jurisdictions are adapting strict regulations concerning the disposal of hydrocarbons. Furthermore, this method entails a substantial expense and represents a large potential liability.
It is also known in the art to use biological materials such as bacteria and enzymes to degrade hydrocarbon. Given sufficient time, the bacteria or enzymes can naturally degrade the hydrocarbon contaminants. Thus, as shown in U.S. Pat. No. 3,152,983, one may use a microbial method for the disposal of oil waste. U.S. Pat. No. 3,871,956 teaches a method for cleaning accidental oil spills on water or in a soil using a microbial method.
While such methods are known and have been proposed for a number of years, the commercial use of these methods has been rather limited due to time limitations and ineffectiveness.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a microbial cleaning composition which is both effective and cost efficient.
It is a further object of the present invention to provide a method for cleaning a substrate having hydrocarbons thereon, and which process is environmentally friendly and relatively inexpensive.
According to one aspect of the present invention, there is provided a method of cleaning a substrate having an organic compound thereon, the method comprising the step of applying to the substrate a composition comprising a lignosulfonate and a microbially effective amount of microorganisms in an aqueous solution.
According to a further aspect of the present invention, there is provided a method for the preparation of a cleaning mixture for use in cleaning a substrate, the method comprising the steps of providing ammonium lignosulfonate, adjusting the pH of the ammonium lignosulfonate to a pH value of between 6.5 and 7.5, and adding a microbially effective amount of hydrocarbon degrading bacteria to the ammonium lignosulfonate.
According to a further aspect of the present invention, there is provided a cleaning solution comprising ammonium lignosulfonate, a microbially effective amount of hydrocarbon degrading bacteria mixed with the ammonium lignosulfonate, the ammonium lignosulfonate being pH adjusted to a pH value of between 6.5 and 7.5.
Preferred substrates include a marine vessel or portion thereof, a motor vehicle or portion thereof, and floors.
In a greater detail, the lignins are a natural complex polymer which are generally produced as a co-product of the paper industry, the lignins being separated from the trees by a chemical pulping process. Lignosulfonates are also known as lignin sulfonates and sulphite lignins are products of sulphite pulping. Other delignifying technologies may include the use of an organic solvent or high pressure steam treatment to remove lignins from plants.
As aforementioned, lignin is a very complex natural polymer, the exact chemical structure not being known. Physical and chemical properties can differ depending on the extraction technology. Lignosulfonates have typically been used for their dispersing, binding, complexing and emulsifying properties. Lignins have been used for many years and extensive studies have been done to test lignin impact on the environment. To date, lignins have been shown to be safe and not harmful to plants, animals and aquatic life when properly manufactured and applied. Furthermore, lignosulfonates have been found to be essentially non-toxic and non-irritating, non-mutagenic nor toxic and may be widely used in animal and human feed contact products.
The particular microbe or microbes used in conjunction with the lignosulfonates may be selected from among those known to have the property to degrade hydrocarbons. Several such microbes are described in the literature and are commercially available for the specific purpose of degrading hydrocarbons such as petroleum products.
Surprisingly, it has been found that the use of the lignosulfonate with the microbes is a very efficient and cost effective way of cleaning hydrocarbon containing substrates. Without being limited to any particular theory, it is thought that the lignosulfonates provide a readily available food source for the microbes and the lignosulfonate also helps in the cleaning. As such, the microbes are in a healthy and active state when they are placed in contact with the hydrocarbons and hence are able to reactivate themselves very quickly and thus are highly effective.
As aforementioned, the microbes may be selected from those known in the art. Such may include microorganisms of the genus Achromobacter, Actinobacter, Alcaligenes, Arthrobacter, Bacillus, Flavobacterium, Pseudomonas, and mixtures thereof. Particularly preferred are those naturally occurring non toxigenic microorganisms of the genus Bacillus, species
subtilis, licheniformis
, and
polymyxa.
The microbial content may vary and again, is within the skill of those knowledgeable in the art to use a suitable concentration for a given condition. In a preferred embodiment, a concentrate with a viable bacterial content (CFU) in the billions of organisms per gram may be utilized. After mixing with the lignosulfonate, the concentrate may form between 0.5% to 5% by weight of the composition and with a microbial content in excess of 50,000 CCU per gram. The various strains of microorganisms can degrade and detoxify a large range of substituted and unsubstituted aliphatic and aromatic hydrocarbons.
Preferably, the composition is adjusted to have a pH of between 6.5 and 7.5 and preferably in the range of 7 (neutral). In order to do so, the naturally acidic lignosulfonate which has a pH of between 4 and 5, may have lime added thereto in an amount sufficient to bring the pH to

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