A method for reducing pollutant discharge in phenol acetone production, comprising at least one of the following steps: (A) collecting phenolic wastewater generated by a phenol-acetone plant, adjusting the pH value to acidic, and performing extraction and recovery on the phenols in wastewater using cumene as an extracting agent; (B) reducing the acetone content in the wastewater from a column bottom by means of optimizing the process of an acetone refining column; (C) treating the wastewater from the column bottom of the acetone refining column by using a permselective membrane, and recovering alkali; (D) neutralizing the wastewater obtained from step (C), mixing the neutralized wastewater with a condensation liquid at the top of a cumene oxidation column, and carrying out a detoxification treatment; (E) carrying out an oil separation treatment on total discharged wastewater from the phenol-acetone plant, and recovering organic matters comprising hydrocarbons; and (F) carrying out a biological treatment, a coagulation sedimentation treatment and a reinforced degradation treatment on the wastewater after undergoing the oil separation treatment. The method has at least one of characteristics of being capable of recovering resources, increasing product yield, reducing pollutant discharge, having low cost in wastewater treatment, and having stable quality for water output.

A method includes receiving a water stream from a hydrocarbon production facility, the water stream having a first concentration of a kinetic hydrate inhibitor (KHI); flowing the water stream through a heat exchanger to heat the water stream to a target temperature; mixing the heated water stream with a treatment chemical to form a two-phase mixture, the treatment chemical having an affinity for the KHI; flowing the two-phase mixture into a separator; and physically separating the two-phase mixture into a first phase and a second phase, the first phase including water and having a second concentration of the KHI less than the first concentration, and the second phase including the KHI and the treatment chemical, the density of the second phase being less than the density of the first phase.

A method includes receiving a water stream from a hydrocarbon production facility, the water stream having a first concentration of a kinetic hydrate inhibitor (KHI); flowing the water stream through a heat exchanger to heat the water stream to a target temperature; mixing the heated water stream with a treatment chemical to form a two-phase mixture, the treatment chemical having an affinity for the KHI; flowing the two-phase mixture into a separator; and physically separating the two-phase mixture into a first phase and a second phase, the first phase including water and having a second concentration of the KHI less than the first concentration, and the second phase including the KHI and the treatment chemical, the density of the second phase being less than the density of the first phase.

A method includes receiving a water stream from a hydrocarbon production facility, the water stream having a first concentration of a kinetic hydrate inhibitor (KHI); flowing the water stream through a heat exchanger to heat the water stream to a target temperature; mixing the heated water stream with a treatment chemical to form a two-phase mixture, the treatment chemical having an affinity for the KHI; flowing the two-phase mixture into a separator; and physically separating the two-phase mixture into a first phase and a second phase, the first phase including water and having a second concentration of the KHI less than the first concentration, and the second phase including the KHI and the treatment chemical, the density of the second phase being less than the density of the first phase.

A method includes receiving a water stream from a hydrocarbon production facility, the water stream having a first concentration of a kinetic hydrate inhibitor (KHI); flowing the water stream through a heat exchanger to heat the water stream to a target temperature; mixing the heated water stream with a treatment chemical to form a two-phase mixture, the treatment chemical having an affinity for the KHI; flowing the two-phase mixture into a separator; and physically separating the two-phase mixture into a first phase and a second phase, the first phase including water and having a second concentration of the KHI less than the first concentration, and the second phase including the KHI and the treatment chemical, the density of the second phase being less than the density of the first phase.

The invention relates to a multi-step method for the selective, environmentally friendly and economical recovery of non-ferrous metals from industrial wastewater. The method is based on the principle of the complexing of the non-ferrous metals, separating out of the complexes and subsequent decomplexing of the non-ferrous metals. Siderophores are used as complexing agents. The siderophores are recovered within the process. The method can be used in particular even in the case of low non-ferrous metal concentrations. The method is efficient, environmentally friendly and economical.

The invention relates to a multi-step method for the selective, environmentally friendly and economical recovery of non-ferrous metals from industrial wastewater. The method is based on the principle of the complexing of the non-ferrous metals, separating out of the complexes and subsequent decomplexing of the non-ferrous metals. Siderophores are used as complexing agents. The siderophores are recovered within the process. The method can be used in particular even in the case of low non-ferrous metal concentrations. The method is efficient, environmentally friendly and economical.

Methods for removing an oxyanion from an aqueous source containing said oxyanion, comprising contacting said aqueous source with an aqueous-insoluble hydrophobic solution containing an oxyanion extractant compound dissolved in an aqueous-insoluble hydrophobic solvent to result in formation of an oxyanion salt of said extractant compound and extraction of said oxyanion salt into said aqueous-insoluble hydrophobic solution, wherein said extraction results in an extraction affinity (D) of said oxyanion of at least 1, wherein D is the concentration ratio of said oxyanion in the organic phase divided by the concentration of said oxyanion in the aqueous phase; wherein said extractant compound has the following composition: ##STR00001##
wherein at least one of R.sup.1-R.sup.10 is or contains a hydrocarbon (R) group containing at least 4, 5, 6, 7, 8, 9, 10, 11, or 12 carbon atoms.

Methods for removing an oxyanion from an aqueous source containing said oxyanion, comprising contacting said aqueous source with an aqueous-insoluble hydrophobic solution containing an oxyanion extractant compound dissolved in an aqueous-insoluble hydrophobic solvent to result in formation of an oxyanion salt of said extractant compound and extraction of said oxyanion salt into said aqueous-insoluble hydrophobic solution, wherein said extraction results in an extraction affinity (D) of said oxyanion of at least 1, wherein D is the concentration ratio of said oxyanion in the organic phase divided by the concentration of said oxyanion in the aqueous phase; wherein said extractant compound has the following composition: ##STR00001##
wherein at least one of R.sup.1-R.sup.10 is or contains a hydrocarbon (R) group containing at least 4, 5, 6, 7, 8, 9, 10, 11, or 12 carbon atoms.

Described herein are novel emulsion liquid membranes useful for extracting pollutants from industrial wastewater and water. The emulsion liquid membranes include, in various phases, at least one of nanoparticles, an ionic liquid, and combinations of nanoparticles and ionic liquids. Use of the present emulsion liquid membranes enhances the separation and the stability of the ELM method for pollutant extraction and recovery from wastewater and water.