Ozone-based biofilm biochemical reaction system and wastewater purification process

Abstract

The invention belongs to the field of wastewater treatment, and particularly relates to an ozone-based biofilm biochemical reaction system and a wastewater purification process. The system comprises an ozone reactor, an oxygen-enriched aeration biofilm biochemical reactor, and an ozone decomposition reactor, wherein the ozone reactor is used for purifying wastewater by using ozone, the oxygen-enriched aeration biofilm biochemical reactor communicates with an ozone generator, and is used for carrying out deep purification treatment of the purified wastewater and performing discharge, and the ozone decomposition reactor respectively communicates with the ozone generator and the oxygen-enriched aeration biofilm biochemical reactor, and is used for decomposing the unreacted ozone after passingthrough the ozone reactor into oxygen. The invention provides a low-energy-consumption, high-efficiency, and economical wastewater deep purification process: an ozone catalytic oxidation in series with fixed biofilm biochemical reactor. With relatively low energy consumption, wastewater can be purified and discharged up to standard.

Description

technical field [0001] The invention belongs to the field of wastewater treatment, and in particular relates to an ozone-based biofilm biochemical reaction system, wastewater purification and process for advanced treatment of organic wastewater. Background technique [0002] In order to cope with the deteriorating ecological environment, the country continues to promulgate stricter environmental protection standards, and the requirements for sewage treatment are also constantly increasing. With the rapid development of industry, the volume of industrial wastewater is increasing, and the components are becoming more and more complex. The difficulty of treatment is also increasing, especially the treatment of those refractory organics or organic pollutants that are toxic to organisms has attracted great attention, but these organic pollutants are not only difficult to biodegrade, but also difficult to use general Oxidant removal by oxidation. [0003] In order to achieve the ...

AI Technical Summary

Problems solved by technology

For example, channel flow and wall flow phenomenon occur in the ozone reactor, resulting in low ozone utilization rate and poor treatment effect; tail gas ozone destroyer needs high temperature heating to effectively destroy ozone, and the energy consumption is high; the oxygen in the tail gas after ozone decomposition (tail Oxygen) content is still as high as more than 80%, because it is harmless and basically all directly discharged into the atmosphere, thereby causing a large amount of waste of energy

[0005] 2) Ozone catalytic oxidation is not complete for the oxidation of refractory organic matter, and it is difficult to further oxidize the oxidized small molecular substances, so pure ozone catalytic oxidation has certain limitations for the treatment of organic matter

[0006] Patent CN201620061049.2 proposes a two-stage ozone catalytic oxidation wastewater treatment device. After the first-stage ozone catalytic oxidation, the wastewater enters the second-stage ozone catalytic oxidation. After the ozone tail gas is destroyed, it is directly discharged into the atmosphere. Although this method improves the waste water The degree of treatment of medium organic pollutants, but it cannot solve the problem of low ozone utilization rate, and the oxygen consumption and equipment investment cost are high

[0007] In order to solve the problem of ozone tail gas utilization, the patent CN205603366U proposes to destroy the ozone tail gas from catalytic oxidation of ozone and return it to the upstream biochemical reactor for recovery. Although this method reduces the aeration rate of the upstream biochemical reaction and reduces power consumption, it does not Can not solve the problem of treatment of small molecule organic matter in wastewater after ozone catalytic oxidation

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