Compound oxidation-biological active carbon technology for removing coking reverse osmosis concentrated water organic matters

A technology of reverse osmosis concentrated water and biological activated carbon, which is applied in the direction of water pollutants, biological water/sewage treatment, oxidized water/sewage treatment, etc., can solve problems affecting the normal operation of the system, low treatment efficiency, and damage to membrane components, etc., to achieve The effect of improving the removal rate of organic matter

Inactive Publication Date: 2019-03-08
BEIJING CYCLE COLUMBUS ENVIRONMENTAL TECH RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The effect of ozone oxidation alone on the removal of organic matter in reverse osmosis concentrated water is average, and the coupled oxidation of ozone and hydrogen peroxide has a good removal effect. The COD value in the water drops slowly, and the treatment efficiency decreases. At the same time, the residual ozone and hydrogen peroxide in the wastewater have strong oxidizing properties, which will damage the membrane modules and affect the normal operation of the subsequent system.
[0004] Therefore, in view of the problems existing in the current reverse osmosis concentrated water organic matter removal process, a process is developed to solve the reverse osmosis concentrated water organic matter treatment process with low treatment efficiency and residual ozone and hydrogen peroxide.

Method used

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  • Compound oxidation-biological active carbon technology for removing coking reverse osmosis concentrated water organic matters

Examples

Experimental program
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Effect test

Embodiment 1

[0033] The COD of reverse osmosis concentrated water in a coking plant is 152mg / L. The wastewater enters the composite oxidation tower first, and the dosage of hydrogen peroxide is 200mg / L. When the residence time is 40min, the COD decline rate is less than 0.4mg / L·min After oxidation, the COD of wastewater is reduced to 87mg / L, and the effluent enters the aeration tank, and the residence time is 1h to remove residual ozone and hydrogen peroxide. Activated carbon, wherein the particle size of activated carbon is in the range of 0.5-3mm, and the hydraulic retention time is 0.5h. Before the start-up of the biological activated carbon unit, the activated carbon is bio-coated first, and the high-efficiency salt-tolerant biological bacteria agent is used for coating and domestication. The dosage of the high-efficiency salt-tolerant bacteria agent is 100mg / L, and the effluent of the biological activated carbon process is 46mg / L.

Embodiment 2

[0035] The COD of reverse osmosis concentrated water in a coal chemical plant is 193mg / L. The wastewater first enters the composite oxidation tower, and the dosage of hydrogen peroxide is 400mg / L. When the residence time is 60min, the COD decline rate is less than 0.4mg / L·min. After compound oxidation, the COD of the wastewater is reduced to 101mg / L, the effluent enters the aeration tank, the residence time is 2h, and the residual ozone and hydrogen peroxide are removed. Load activated carbon, wherein the particle size of activated carbon is in the range of 0.5-3mm, and the hydraulic retention time is 1h. Before the start-up of the biological activated carbon unit, the activated carbon is bio-filmed first, and the high-efficiency salt-tolerant biological bacteria is used for coating and domestication. The dosage of the high-efficiency salt-tolerant bacteria is 200mg / L, and the effluent of the biological activated carbon process is 55mg / L.

Embodiment 3

[0037] The COD of reverse osmosis concentrated water in a paper mill is 241mg / L. The wastewater enters the composite oxidation tower first, and the dosage of hydrogen peroxide is 600mg / L. After compound oxidation, the COD of the wastewater is reduced to 112mg / L, the effluent enters the aeration tank, the residence time is 3h, and the residual ozone and hydrogen peroxide are removed. The dissolved oxygen content in the effluent is 4mg / L, and the effluent enters the biological activated carbon unit in the form of a filter Load activated carbon, wherein the particle size of activated carbon is in the range of 0.5-3mm, and the hydraulic retention time is 2h. Before the start-up of the biological activated carbon unit, the bio-filming of the activated carbon is carried out first, and the high-efficiency salt-tolerant biological bacteria agent is used to coat the film and domesticate. The dosage of the high-efficiency salt-tolerant bacteria agent is 300mg / L, and the effluent of the b...

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Abstract

The invention discloses a compound oxidation-biological active carbon technology for removing coking reverse osmosis concentrated water organic matters. The technology comprises the following steps: firstly performing ozone and hydrogen peroxide compound oxidation on reverse osmosis concentrated water, mineralizing and removing a part of the organic matters, and converting a part of the degradation-resistant organic matters into the readily biodegradable organic matters; performing aeration treatment on effluent of the compound oxidation, after enabling residual ozone in the water to be escaped and promoting residual hydrogen peroxide to be decomposed, entering a biological active carbon treatment unit, finally discharging the effluent after reaching a standard. The technology is capable of, through the aeration treatment, removing the residual ozone and hydrogen peroxide, avoiding from damaging microorganisms after entering the biological active carbon unit, and oxygenating wastewater, guaranteeing stable operation of the follow-up biological active carbon unit, and finally enabling the effluent to reach the standard stably.

Description

technical field [0001] The invention relates to the field of advanced treatment of industrial wastewater, in particular to a composite oxidation-biological activated carbon process for removing organic matter in coking reverse osmosis concentrated water. Background technique [0002] Ultrafiltration + reverse osmosis technology has been widely used in the field of industrial wastewater reuse. Generally speaking, the yield of reverse osmosis desalinated water is about 70-80%, and about 20-30% of concentrated water will be produced at the same time. Zero discharge of wastewater is a future development trend. Concentrated water needs to be treated to further concentrate it. Permeate concentrated water is characterized by high salt content, high hardness, and difficulty in treating organic matter. Among them, organic pollutants are pollutants that have not been removed by the previous multi-stage treatment process. They have poor biodegradability and are difficult to treat. que...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F101/30
CPCC02F1/722C02F1/78C02F3/34C02F2101/30
Inventor 李海波王靖宇李玉平盛宇星刘亚丽
Owner BEIJING CYCLE COLUMBUS ENVIRONMENTAL TECH RES INST CO LTD
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