An oil removing method for domestic wastewater

Abstract

An oil removing method for domestic wastewater is disclosed. The wastewater flows through a collecting well, a coarse screen, a primary sedimentation tank, a pH value adjusting tank, a nanometer micropore ultrasonic wave batch polymerization reaction tank, a secondary sedimentation tank, a high-pressure discharge organorhodium catalytic polymerization reaction tank, a third sedimentation tank and a purified-water tank in order. Synergistic chemical effects of ultrasonic waves with a specific frequency (that is 25100-27800 Hz) are utilized creatively in the method, C-H bond breaking and rapid re-bonding of organic matters in the wastewater under the condition are performed on the surface of a nanometer micropore membrane material, thus polymerizing on surfaces of nanometer micropore surface polymers. When ultrasonic wave catalyzed polymerization and a stirring process are performed alternatively, molecular weights of polymers of the organic matters gradually increase, the polymers of the organic matters gradually converge into large-particle insoluble substances, and the large-particle insoluble substances are separated from the surface of the nanometer micropore membrane material, dispersed in the wastewater in a form of suspended solids, and are finally removed through sedimentation processes.

Description

technical field [0001] The invention relates to a domestic sewage degreasing method, which belongs to the field of waste water treatment in environmental protection. Background technique [0002] In domestic sewage, oily sewage is one of the main water bodies. Numerous restaurants, canteens, food processing enterprises and residents will discharge a large amount of sewage in their daily life, which contains a large amount of animal and vegetable oils. If it is not treated directly, it will cause blockage of pipelines, turbidity and corruption of water bodies, and breeding of diseases. source. [0003] At present, the existing domestic sewage degreasing methods include two kinds of chemical methods and physical methods. [0004] (1) The advantages of chemical treatment are low equipment cost, good treatment effect, and simple operation; the disadvantage is that it needs to continuously inject chemicals into the wastewater, which has high operating costs and will introduce s...

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Problems solved by technology

[0004] (1) The advantages of chemical treatment are low equipment cost, good treatment effect, and simple operation; the disadvantage is that it needs to continuously inject chemicals into the wastewater, which has high operating costs and will introduce secondary pollution

[0005] (2) Physical methods mainly include filtration separation method and air flotation separation method, but they are only suitable for separating oil products with large particles in wastewater, the treatment efficiency is 60-80%, and the oil content in effluent water is about 100-200 mg / Lift

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