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Two-stage ozonation-biological contact coupled advanced sewage treatment method and device

A technology of biological contact and ozone oxidation, applied in biological water/sewage treatment, oxidized water/sewage treatment, water/sewage treatment, etc., to achieve the effect of reducing investment cost, floor area, and ozone dosage

Pending Publication Date: 2020-12-25
BLUESTAR LEHIGH ENG INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] To sum up, ozone oxidation-biochemistry is an interrelated overall treatment system. Under the same treatment effect conditions, although changing a certain parameter in the system can achieve part of the goal, it may cause other problems.

Method used

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  • Two-stage ozonation-biological contact coupled advanced sewage treatment method and device
  • Two-stage ozonation-biological contact coupled advanced sewage treatment method and device
  • Two-stage ozonation-biological contact coupled advanced sewage treatment method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] A biochemical tail water that has undergone biochemical treatment and B / C is lower than 0.01, COD 120mg / L, SS 10mg / L, adopts method A and method B to treat wastewater respectively, and the scale of wastewater treatment is Q=1m 3 / h, the reaction time of each ozone contact oxidation tank is 30min, and the residence time of each contact oxidation tank is 2h; the return flow of two-stage ozone oxidation-biological contact coupling device q=0.5~3m 3 / h, the total ozone dosage m=50mg / L (only related to Q), and the pre-ozone dosage m1=35mg / L, and the post-ozone dosage m2=15mg / L. The wastewater treatment effects of different methods under different conditions are shown in the table below.

[0072] Table 1 The treatment effect of the two-stage ozone oxidation-biological contact coupling device of the present invention

[0073]

[0074] Under the condition that the total ozone dosage is the same, adopt the two-stage ozone oxidation-biological contact coupling device (method ...

Embodiment 2

[0076] Waste water quality is the same as embodiment 1, respectively adopt method A and method C to process waste water, waste water treatment scale Q=1m 3 / h, the reaction time of each stage of ozone contact oxidation is 60min, and the residence time of each stage of contact oxidation device is 3h; the return flow of two-stage ozone oxidation-biological contact coupling device q=1~3m 3 / h, method A and method C total ozone dosage m=50mg / L (only related to Q), pre-ozone dosing concentration is 35mg / L, post-ozone dosing concentration is 15mg / L. The wastewater treatment effects of different methods under different conditions are shown in the table below.

[0077] Table 2 The treatment effect of the two-stage ozone oxidation-biological contact coupling device of the present invention

[0078]

[0079] When the total amount of ozone is the same, the COD removal rate is significantly higher than that of the two-stage ozone oxidation-biochemical coupling device without reflux. ...

Embodiment 3

[0081] A biochemical tail water with B / C lower than 0.01 after two-stage biochemical treatment, COD 100mg / L, SS 10mg / L, using method A and method C to treat wastewater, wastewater treatment scale Q=1m 3 / h, before the ozone contacts the oxidation pool O 3 The reaction time is 40min, after the ozone contact oxidation O 3 The reaction time is 20min, the residence time in the pre-contact oxidation tank is 2h, and the residence time in the post-contact oxidation tank is 2h; the return flow rate of the two-stage ozone oxidation-biological contact coupling device is q=0~3m 3 / h, method A and method C total ozone dosage m=50mg / L (only related to Q), pre-ozone dosing concentration is 35mg / L, post-ozone dosing concentration is 15mg / L. The wastewater treatment effects of different methods under different conditions are shown in the table below.

[0082] Table 3 The treatment effect of the two-stage ozone oxidation-biological contact coupling device of the present invention

[0083] ...

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Abstract

The invention discloses a two-stage ozonation-biological contact coupled advanced sewage treatment method and a device thereof. Sewage or RO concentrated water subjected to biochemical pretreatment issequentially subjected to ozonation, biological contact, ozonation and biological contact for combined treatment, biochemical effluent at the rear end flows back to ozonation inflow water at the front end, and the sewage is circularly treated in an ozonation-biological contact system through backflow; due to the fact that the biodegradability of the sewage is improved to a certain extent every time when the sewage flows through the ozonation stage, biodegradable ozonation products are degraded in time in the biochemical treatment stage, and the synergistic coupling effect of biodegradabilityimprovement of ozonation and low-cost mineralization of biochemistry is enhanced by controlling the biochemical effluent reflux ratio. According to the method, the treatment efficiency is improved under the condition of the determined total ozone addition amount, and the ozone consumption is reduced under the condition of a determined removal rate; and the method has important significance for reducing the investment cost, the operation cost and the engineering land occupation of advanced sewage treatment.

Description

technical field [0001] The invention belongs to the technical field of advanced sewage treatment, and also belongs to the technical field of ozone oxidation application, in particular to a two-stage ozone oxidation-biological contact coupled sewage advanced treatment method and device. Background technique [0002] The oxidation of organic matter by ozone includes direct oxidation and indirect oxidation. The direct oxidation of ozone refers to the molecular ozone O 3 It reacts directly with organic matter, and its reaction mechanism mainly includes cycloaddition reaction, electrophilic reaction and nucleophilic reaction. The indirect oxidation of ozone refers to the self-decomposition of ozone after being induced to form the secondary oxidant hydroxyl radical OH and the oxidation reaction with organic matter. The oxidation mechanism mainly includes electrophilic addition reaction, dehydrogenation reaction and electron transfer reaction. Generally, the reaction rate of OH a...

Claims

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Application Information

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IPC IPC(8): C02F9/14
CPCC02F1/78C02F1/722C02F1/32C02F1/725C02F3/1205C02F3/1236
Inventor 徐军王强王开春张璐璐李坤张文杰田凤蓉孟庆强
Owner BLUESTAR LEHIGH ENG INST CO LTD
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