A water treatment method combining flocculation, counter-current ozone air floatation and biofiltration in order and a device used in the method

Abstract

A water treatment method combining flocculation, counter-current ozone air floatation and biofiltration in order and a device used in the method are disclosed. The device comprises a flocculation reaction zone, a counter-current ozone air floatation zone and a biofiltration zone which are connected in order. The flocculation reaction zone comprises two grades. One side of the first grade is connected to a water feeding pipe. A bottom outlet of the first grade is connected to an air floatation water distribution zone of the second grade. A water inlet pipe is disposed in the upper part of the counter-current ozone air floatation zone and connected to the air floatation water distribution zone. The top of the counter-current ozone air floatation zone is provided with a scum accumulating zone, the middle of the counter-current ozone air floatation zone is provided with a rectification filler, and the lower part of the counter-current ozone air floatation zone is provided with a plurality of air-dissolving water-releasing heads, a macroporous water collecting plate and a punched water collecting pipe. The water collecting pipe is communicated with a biofiltration water distribution zone. One side of the biofiltration zone is provided with the biofiltration water distribution zone, and the other side of the biofiltration zone is provided with a backwashing water collecting tank. The biofiltration zone is provided with an air-water backwashing system. The method and the device can effectively remove chroma, turbidness, microorganisms and various organic pollutants in water, and are suitable for drinking water treatment and sewage recovery and reutilization projects.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a water treatment method of flocculation-counterflow ozone flotation-biological filtration and a device used therefor. Background technique [0002] In recent years, due to the rapid development of social economy, the pollution of drinking water sources has become increasingly prominent, and the safety of drinking water quality has become an urgent proposition related to millions of households. The study found that the traditional water purification process, namely "coagulation-sedimentation (or air flotation)-filtration-disinfection", is difficult to solve the problems of chlorine disinfection by-products, algae and algal toxins, and organic micro-pollutants. On the other hand, urban sewage treatment plants have been considered to be one of the most important sources of trace emerging organic pollutants (such as drugs and personal care products, endocrine dis...

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Problems solved by technology

[0004] In order to overcome the common problems of long process and complex operation and management in the current application of ozone technology in water and wastewater treatment, and at the same time avoid the defects of the reactor structure in the existing ozone flotation process, the present invention provides a The reverse flow air flotation process, combined with biological filtration technology, forms a "flocculation-counterflow ozone air flotation-biological filtration" water treatment combination method and the device used. The method and device have a short process flow and a compact structure, which can effectively remove turbidity, Decolorization, sterilization and removal of trace emerging organic pollutants, especially suitable for the treatment of drinking water and reclaimed water

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