Described herein is a method of remediating a water source of a target aquatic life. The method comprises collecting at least one target species of aquatic life from a water source, separating an oil from the solids of the target aquatic life, and refining a polyunsaturated fatty acid (PUFA) mixture from the oil. The water source is at least partially remediated by collecting the at least one target species of aquatic life from the water source.

A method for processing natural oil is provided. The method includes providing a natural oil to be processed, adding an inorganic particulate material to said natural oil, and processing the resulting mixture to obtain oil products with an improved yield and/or quality.

The present invention discloses a method for recycling urea in the process of separating and purifying unsaturated substances through a urea adduction method. The method comprises the following steps: liposoluble substances containing target unsaturated components are used as raw materials, and subjected to urea adduction, crystallization and filtration to produce a filtrate, from which the specific unsaturated components are obtained; the urea adduct is dissolved in a polar solvent, and after the adducted adducts are layered and released, adding a certain solvent to the urea solution to adjust the polarity, then cooling for crystallization, and recycling the urea. The method can realize complete release of the adducted components and recycling and reuse of urea, and the process is simple, the recovery rate is high, and the adduction effect is not influenced when recycling urea for reuse, and the production cost of the urea adduct is reduced, thus alleviating the adverse impact of urea discharges on the environment.

Disclosed are methods of recovering urea from a urea/oil complex by drying the complex, combining the complex with water to form a urea solution, and removing water from the urea solution. Methods for recycling the urea in urea complexation processes are also disclosed. Also disclosed are methods of recovering polyunsaturated fatty acids or derivatives thereof from the urea/oil complexes.

The present technology provides a process of reducing, removing or eliminating organohalo, glycidol, and oxirane species from carboxylic acid esters streams and crude and refined triglyceride oils to provide a carboxylic acid ester stream or triglyceride oil with reduced levels or essentially free of organohalo, glycidyl or other oxirane species. The process includes adding to the carboxylic acid ester stream or triglyceride oil an amount of a carboxylate anion and a cation counterion sufficient to react with the organohalo, glycidyl and oxirane species present.

The present invention relates to a process for winterizing crude fish oil by an improved winterization process, wherein a solubilizing agent is added to the fish oil prior to the winterization. The solubilizing agent is preferably a fat-soluble edible organic compound, such as fatty acids or fatty acid mixtures. The invention further relates to compositions obtainable by the process.

The present invention discloses a method for recycling urea in the process of separating and purifying unsaturated substances through a urea adduction method. The method comprises the following steps: liposoluble substances containing target unsaturated components are used as raw materials, and subjected to urea adduction, crystallization and filtration to produce a filtrate, from which the specific unsaturated components are obtained; the urea adduct is dissolved in a polar solvent, and after the adducted adducts are layered and released, adding a certain solvent to the urea solution to adjust the polarity, then cooling for crystallization, and recycling the urea. The method can realize complete release of the adducted components and recycling and reuse of urea, and the process is simple, the recovery rate is high, and the adduction effect is not influenced when recycling urea for reuse, and the production cost of the urea adduct is reduced, thus alleviating the adverse impact of urea discharges on the environment.

Provided is a method for producing a polyunsaturated fatty acid while suppressing deterioration of a silver salt solution. A method for producing a polyunsaturated fatty acid-containing composition, the method comprising: supplying a raw material solution comprising an alkyl ester of polyunsaturated fatty acid and an aqueous solution comprising a silver salt to a flow channel mixer to contact the raw material solution with the aqueous solution; and collecting the aqueous solution comprising the silver salt which has been contacted with the raw material solution, in which the supplying the aqueous solution comprising the silver salt to the flow channel mixer and the collecting the same are performed concurrently.

The present invention relates to oil compositions that are enriched in polyunsaturated fatty acids; compositions containing the oil compositions; and methods of making and using the oil compositions. The oil is preferably a microbial or marine oil.

Provided is a method for producing a polyunsaturated fatty acid while suppressing deterioration of a silver salt solution. A method for producing a polyunsaturated fatty acid-containing composition, the method comprising: supplying a raw material solution comprising an alkyl ester of polyunsaturated fatty acid and an aqueous solution comprising a silver salt to a flow channel mixer to contact the raw material solution with the aqueous solution; and collecting the aqueous solution comprising the silver salt which has been contacted with the raw material solution, in which the supplying the aqueous solution comprising the silver salt to the flow channel mixer and the collecting the same are performed concurrently.