Liquid purification or separation – Processes – Ion exchange or selective sorption
Reexamination Certificate
2000-04-05
2002-07-09
Mai, Ngoclan (Department: 1742)
Liquid purification or separation
Processes
Ion exchange or selective sorption
C210S692000, C210S694000
Reexamination Certificate
active
06416671
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to the processing of waste solution containing organic chemicals, biohazardous agents, and other hazardous or environmentally undesirable agents, and to the removal of such agents from liquid waste solutions. More specifically, this invention relates to the use of solid phase binders to remove organic chemicals, biohazardous agents, and other hazardous or environmentally undesirable agents from liquid waste solutions.
BACKGROUND OF THE INVENTION
There is widespread release of hazardous and environmentally disadvantageous organic chemicals and biohazardous agents into the natures water supplies. For examples, contamination of underground water with methyl tertiary butyl ether (MTBE) resulting from the leakage of gasoline storage tanks has resulted in the urgent need for effective and economical separation and removal of this carcinogenic agent from water reservoirs and other water streams. Important examples of other hazardous or environmentally disadvantageous organic chemicals and biohazardous agents include pesticides used in agriculture. Pesticides also end up in water reservoirs and water streams through water run off in the process of irrigation. Hazardous chemicals produced in chemical plants, or toxic byproducts produced during processes of refining oil, are among other examples of liquid waste including hazardous chemicals. Most of the hazardous chemicals generated in oil refineries, for instance, are stored on site; some are released with the non-hazardous waste either inadvertently, or due to the lack of regulations, perhaps in the absence of effective, efficient and economically viable separation/removal techniques. These toxic chemical contaminants are usually found in aqueous or organic solutions in relatively low, but nevertheless hazardous concentration. By removing these low concentration contaminants, the solution then can be released into the waste stream safely, or recycled.
Biohazardous agents, such as viruses and bacterial contaminated solutions are sometimes released into the sewage systems by hospitals, research laboratories, and biotechnology organizations. Although most of these contaminants are destroyed as a result of being exposed to a relatively harsh environment in the sewage treatment system. However, many viruses and bacterium will survive the sewage treatment cycle and can pose a real health threat. Hepatitis virus and
Escherichia coli
bacteria for instance are among such biohazardous agents. It is therefore advantageous to develop methods to remove biohazardous agents from liquid contaminated waste solutions. Following the removal process, the decontaminated liquids are rendered non-hazardous and can then be discarded as regular non-hazardous waste.
It must be noted that the disposal or storage of large volumes of low level liquid hazardous chemicals or biohazardous agents is particularly expensive and difficult without first concentrating and extracting these agents from the liquid waste stream. There is a demonstrated need for effective and comparatively inexpensive methods to remove these hazardous chemicals or biohazardous agents in concentrated form from liquid waste solutions. When this is accomplished, the concentrated hazardous chemicals or biohazardous agents can more easily be destroyed rendering the remaining waste non-hazardous. The expense associated with the disposal of concentrated liquid hazardous waste removed from the liquid waste stream is markedly decreased.
SUMMARY OF THE INVENTION
As a first aspect, the present invention provides a method for removing hazardous organic molecules from a liquid waste solution. The method comprises the steps of: a) contacting the liquid waste solution with a solid phase binder comprising an adsorbent particle attached to or entrapped in a matrix to form a solid phase binder:organic molecule complex; and b) separating the complex from the liquid waste solution to remove the organic molecules from the liquid waste solution.
As a second aspect, the present invention provides a second method for removing hazardous organic molecules from a liquid waste solution. The method comprises the steps of: a) contacting the liquid waste solution with a solid phase binder comprising a magnetizable particle binder to form a magnetizable particle binder:organic molecule complex; and b) separating the complex from the liquid waste solution to remove the organic molecules from the liquid waste solution.
As a third aspect, the present invention provides a third method for removing hazardous organic molecules from a liquid waste solution. The method comprises the steps of: a) contacting the liquid waste solution with a solid phase binder comprising an immunochemical binder to form an immunochemical binder:organic molecules complex; and b) separating the complex from the liquid waste solution to remove the organic molecules from the liquid waste solution.
As a fourth aspect, the present invention provides another method for removing hazardous organic molecules from a liquid waste solution. The method comprises the steps of: a) contacting the liquid waste solution with a solid phase binder comprising a natural protein conjugate binder, to form a natural protein conjugate binder:organic molecule complex; and b) separating the complex from the liquid waste solution to remove the organic molecules from the liquid waste solution.
As a fifth aspect, the present invention provides another method for removing hazardous organic molecules from a liquid waste solution. The method comprises the steps of: a) contacting the liquid waste solution with a solid phase binder comprising a targeted peptide binder to form a peptide binder:organic molecules complex; and b) separating the complex from the liquid waste solution to remove the organic molecules from the liquid waste solution.
As a sixth aspect, the present invention provides another method for removing hazardous organic molecules from a liquid waste solution. The method comprises the steps of: a) contacting the liquid waste solution with a solid phase binder comprising a synthetic oligonucleotide binder to form a binder:organic molecule complex; and b) separating the complex from the liquid waste solution to remove the organic molecules from the liquid waste solution.
These and other aspects of the present invention are described in further detail in the detailed description of the preferred embodiments of the invention, and the examples which follow.
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Cortex Biochem, Inc.
Mai Ngoclan
Townsend and Townsend / and Crew LLP
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