943 results about "Oily wastewater" patented technology

A method of clarifying oily waste water comprising adding to the waste water an effective clarifying amount of one or more demulsifiers selected from the group consisting of dendritic polyamines, dendritic polyamidoamines and hyperbranched polyethyleneimines and the reaction products thereof with gluconolactone, alkylene oxides, salts of 3-chloro-2-hydroxypropanesulfonic acid, alkyl halides, benzyl halides and dialkyl sulfates.

The invention discloses a high-throughput efficient 2D net-shaped ultrafine nanofiber oil-water separation material and a preparation method thereof. The preparation method comprises the following steps: a polymer solution is prepared from a selected polymer, a net is formed through electrostatic direct injection of the polymer solution, a spinneret vibrates in situ by the aid of external force inan electrostatic direct injection process to promote generation of charged droplets, the droplets are subjected to phase separation, and a uniform 2D net-shaped ultrafine nanofiber material is formedon the surface of a receiving substrate and is in a continuous and seamlessly stacked shape; then the obtained material is subjected to surface modification, and the 2D net-shaped ultrafine nanofiberoil-water separation material with selective surface and interface wetting property is obtained. The preparation process is simple, raw material limitations are few, and the net-shaped ultrafine nanofiber oil-water separation material has tiny meshes and good pore channel connectivity and has great application prospect in the fields of oil purification, oil-containing wastewater treatment and thelike.

The invention relates to a novel electro-catalytic composite membrane material and a preparation method thereof. The novel electro-catalytic composite membrane material is characterized in that the material can couple electro-catalytic technology and membrane separation technology. The preparation method comprises the following steps: taking a microporous separation membrane with electric conductivity, namely a carbon membrane, as a substrate, adopting a sol-gel method, mixing a metallic compound, water, a solvent, a catalyst, other additives and the like to be configured into a precursor solution, and obtaining an electro-catalytic composite membrane by sol ageing, film coating, drying and heat treatment; and preparing the composite membrane with superior performances by pretreating a substrate and controlling the mixture ratio of raw materials, the soakage time, the pulling speed, the sintering temperature and the like. The novel electro-catalytic composite membrane material takes the electro-catalytic composite membrane as an anode and a metallic material as a cathode to treat wastewater and realizes the reinforcement of the membrane separation process and the self-cleaning function under the action of a low-voltage electric field. The electro-catalytic membrane material has the advantages of low energy consumption, high separation efficiency, strong antifouling property and the like, and can be widely used for treating and recycling heavily polluted wastewater such as oily wastewater, dye wastewater, paper-making wastewater and the like. The preparation method has the advantages of simple preparation process, cheap equipment, easily-obtained raw materials, convenient operation and suitability for industrialized implementation.

The invention discloses an oil removing pretreatment technology for petroleum oil refining wastewater. According to the oil removing pretreatment technology, a water collecting tank with gratings is used for separating sand and sludge; a three-phase cyclone liquid separation floating oil collecting and discharging adjusting tank is used for achieving separation of water, oil and residues; a cyclone oil coarse graining polymerization oil-water separator is used for removing fine oil grains; a dissolved air flotation device is used for demulsification and flocculation reaction, wherein air bubbles and suspended solids in wastewater make contact for adhesion and float upwards, and the standard is met through residue scraping. The technology is simple, the structure is scientific, the three-phase cyclone liquid separation floating oil collecting and discharging adjusting tank, the cyclone liquid coarse graining polymerization oil-water separator and the dissolved air flotation device jointly serve as the core treatment scheme, oily wastewater is pretreated through the density difference of oil and water based on the fluid dynamics principle, a physical method and a chemical method act jointly, and the oil content in the pretreated oily wastewater is smaller than or equal to 20 mg / L and reaches the standard. The oil removing pretreatment technology is large in daily treatment amount, high in oil removing efficiency, remarkable in oil collecting effect and considerable in economic benefit, and the water content of the recycled waste oil is 5% or lower.