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Method for treating sewage by using ozone-containing tail gas

A technology of ozone tail gas and oxidation treatment, applied in the direction of oxidized water/sewage treatment, filtration treatment, sedimentation treatment, etc., can solve the problems of environmental pollution and high cost, and achieve the effect of reducing cost, reducing consumption and improving water quality

Inactive Publication Date: 2017-07-04
FOSHAN JIALIDA ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In the existing ozone oxidation treatment sewage technology, in order to improve the ozone production and the oxidation effect of ozone in the ozone oxidation process, it is usually necessary to use oxygen-rich gas (oxygen volume content 60-100%) as a raw material to prepare ozone, so that the ozone oxidation The cost is high, and it may also cause environmental pollution

Method used

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  • Method for treating sewage by using ozone-containing tail gas

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] The pretreatment is that the sewage passes through the grid mesh filter device, the regulating tank, and the cooling tower in sequence. Use the grid mesh to filter the waste water after removing fibrous substances such as textile fibers with a particle size greater than 1.5mm, and then enter the regulating tank. In the adjustment tank, adjust the parameters such as water volume and pH value, add a certain amount of water or divert a certain amount of printing and dyeing wastewater to achieve the purpose of adjusting the water volume. The water volume requirements are mainly determined according to the treatment volume and impurity content of the printing and dyeing wastewater; The pH value of the aqueous phase is between 6.5-7.5. Pump the wastewater from the regulating tank into the cooling tower to moderately cool it down to 35°C.

[0076] After the wastewater is pretreated, a sedimentation treatment is carried out. The pH value of the primary sedimentation tank is co...

Embodiment 2

[0084] Mix 600L of ozone recovery gas with air at a ratio of 1:3 (volume) to obtain 2400L of mixed gas. The mixed gas, as oxygen-containing gas K, passes through the first group of gas explosion devices in batches, and then enters the primary oxidation tank. The second group of gas explosion devices, the third group of gas explosion devices, the fourth group of gas explosion devices, and the fifth group of gas explosion devices Explosion device, let in air, and the flow rate of each group of explosion device is 100L / h. The residence time of sewage in the primary oxidation tank is 24 hours.

[0085] After oxidation treatment, the sewage enters the secondary precipitation treatment and ozone oxidation treatment for further treatment.

[0086] Sampling and testing at the outlet of the ozone oxidation tank showed that the COD was 35mg / L water, the BOD was 10mg / L, the ammonia nitrogen was 8mg / L, the chroma was removed, and the SS was 11mg / L.

Embodiment 3

[0088]Mix 900L of ozone oxidation recovery gas with air at a ratio of 1:5 (volume) to obtain 5400L of mixed gas. The mixed gas is passed into the primary oxidation tank as the oxygen-containing gas K through the first group of explosion devices and the third group of explosion devices, and the flow rate is 140L / h. The second group of gas explosion devices, the fourth group of gas explosion devices, and the fifth group of gas explosion devices are fed with air at a rate of 100L / h. The residence time of sewage in the primary oxidation tank is 18 hours.

[0089] After oxidation treatment, the sewage enters the secondary precipitation treatment and ozone oxidation treatment for further treatment.

[0090] Sampling and testing at the outlet of the ozone oxidation tank showed that the COD was 33mg / L water, the BOD was 12mg / L, the ammonia nitrogen was 10mg / L, the chroma was removed, and the SS was 12mg / L.

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Abstract

The invention discloses a method for treating sewage by using ozone-containing tail gas. Pretreatment, primary precipitation treatment, primary oxidation treatment, secondary precipitation treatment and ozone oxidation treatment are sequentially carried out on textile printing and dying wastewater, and standard reaching wastewater is discharged or is recycled as recycled water; and an oxygen-containing gas is introduced in the primary oxidation treatment, and the oxygen content of the oxygen-containing gas is 30-100 V / V%. Biological treatment and physicochemical treatment technologies are optimized to effectively treat toxic and harmful substances in the printing and dyeing sewage. Exhaust gas is collected and reused in the sewage treatment process, and the exhaust gas generated in the ozone oxidation process is used as the oxygen-containing gas in the primary oxidation unit, so the raw material gas is fully used, the oxidation effect is accelerated, the sewage treatment cost is effectively reduced, and the influences of the exhaust gas on the environment are reduced.

Description

technical field [0001] The invention relates to a waste water comprehensive treatment process, in particular to a comprehensive utilization process for advanced treatment of waste water produced in textile printing and dyeing operations. Background technique [0002] As a country with scarce water resources, China's per capita fresh water resources are far below the world average. The problem of industrial waste water pollution has made the problem of water resources worse. Especially in densely populated areas with relatively abundant water, rapid economic development and more serious water pollution. As a major wastewater discharger, textile printing and dyeing wastewater contains a large number of difficult-to-degrade dyes, auxiliaries, aromatic compounds, toxic and harmful heavy metals, halides, inorganic substances, sulfides, etc. The concentration of organic matter is high, the variety is various, and the structure is complex, which belongs to the industrial wastewat...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F101/30C02F103/30
CPCC02F1/001C02F1/72C02F1/727C02F1/74C02F1/78C02F9/00C02F2001/007C02F2101/308C02F2103/30C02F2301/08
Inventor 姚颖
Owner FOSHAN JIALIDA ENVIRONMENTAL PROTECTION TECH
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