A method for modifying active coke and its application method for removing organic matter in regenerated water

An application method and technology of activated coke, applied in the field of modified activated coke, can solve the problems of high cost, high investment, restricting long-term use, etc., and achieve the effect of reducing treatment cost, low engineering investment cost, and prolonging the service life of membrane

Active Publication Date: 2016-02-10
清上(苏州)环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the high cost of powdered activated carbon limits its long-term use in engineering
Activated coke is a dark black porous carbonaceous substance developed from lignite as the main raw material. It is an activated carbon adsorbent that has not been fully carbonized or activated. A certain adsorption removal effect, but often requires a high dosage to achieve the ideal removal effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A reclaimed water plant uses the secondary effluent of the urban sewage plant as the water source, and the treatment process adopted is powdered activated carbon adsorption-external pressure ultrafiltration membrane filtration. The DOC content of dissolved organic matter in the raw water was 6.50mg / L, and the dosage of powdered activated carbon was 20mg / L, but the treatment effect was not satisfactory. for 3 months.

[0026] Adopt the method of the present invention to modify active coke: (1) sieve the active coke to obtain particles with a size of 200 to 300 mesh, soak and wash with tap water for 60 minutes, and heat the cleaned active coke at 300° C. for 8 hours; (2 ) The hydroxide ion concentration of the ammonia solution is 8mol L -1 , stirring and mixing the active coke and ammonia water according to the mass ratio of 1:6 for 12 hours, and then heating the soaked active coke at 200° C. for 4 hours to obtain the modified active coke.

[0027] The modified active c...

Embodiment 2

[0029] A reclaimed water plant uses the secondary effluent of an urban sewage plant as its water source. The treatment process adopted is a membrane bioreactor, and powdered activated carbon is added to the reactor. The DOC content of dissolved organic matter in the raw water is 6.00mg / L, and the dosage of powdered activated carbon is 20mg / L, but the treatment effect is not ideal. for 3 months.

[0030] Adopt the method of the present invention to modify active coke: (1) sieve the active coke to obtain particles with a size of 200 to 300 mesh, soak and wash with tap water for 60 minutes, and heat the cleaned active coke at 250°C for 10 hours; (2 ) The hydroxide ion concentration of the sodium hydroxide solution is 10mol L -1 , stirring and mixing active coke and sodium hydroxide according to the mass ratio of 1:3 for 10 hours, and then heating the soaked active coke at 250° C. for 4 hours to obtain modified active coke.

[0031] Put the modified active coke into the membrane...

Embodiment 3

[0033] A reclaimed water plant uses the secondary effluent of the urban sewage plant as the water source, and the treatment process adopted is powdered activated carbon adsorption-external pressure ultrafiltration membrane filtration. The DOC content of organic matter in the raw water is 7.00mg / L, and the dosage of powdered activated carbon is 40mg / L, but the treatment effect is not ideal. months.

[0034] Adopt the method of the present invention to modify active coke: (1) sieve the active coke to obtain particles with a size of 200 to 300 mesh, soak and wash with tap water for 60 minutes, and heat the cleaned active coke at 300° C. for 8 hours; (2 ) The hydroxide ion concentration of potassium hydroxide solution is 10mol L -1 , stirring and mixing active coke and sodium hydroxide according to the mass ratio of 1:3 for 12 hours, and then heating the soaked active coke at 250° C. for 3 hours to obtain modified active coke.

[0035] The modified active coke was put into the m...

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Abstract

The invention belongs to the technical field of the treatment of recycled water, in particular to an active coke modifying method for removing organisms in the recycled water and an application method of modified active coke, which aims at solving the problems that the content of organisms in the water discharged by a membrane in a recycled water factory adopting the membrane treatment process is high and the membrane pollution is severe, and provides a modification method and an application method of active coke. The method for modifying the active coke comprises the following steps of preprocessing the active coke, mixing the active coke with an alkaline solution according to a given ratio for sufficient time, and then heating the active coke to realize the modification of the active coke; and placing the modified active coke into a membrane pool. The oxygen-containing alkaline radicals and hydroxyl radicals added on the surface of the modified active coke are used for increasing the non-activity of the surface of the active coke, so that the effect for adsorbing and removing the organisms in the water can be improved. The active coke can be used for further purification of secondary water of an urban sewage plant and also can be used for the recycled water treatment project adopting the discharged water from urban sewage plant or rainy water as a water source.

Description

technical field [0001] The invention belongs to the technical field of regenerated water treatment, and in particular relates to an application method of modified active coke used for removing organic matter in regenerated water. Background technique [0002] The shortage of water resources has become an important factor restricting the social and economic development of our country, and the reuse of sewage can effectively solve this problem. The concentration of organic matter in domestic sewage after secondary biological treatment is high, and it is still difficult to meet the water quality requirements for urban landscape water, industrial water and other recycled water reuse. At present, the advanced treatment technologies for biochemical effluent mainly include coagulation sedimentation, activated carbon adsorption, chemical oxidation, and membrane bioreactors. Among them, the membrane bioreactor is widely used in the advanced treatment of reclaimed water due to its go...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/20B01J20/30C02F9/02C02F1/28
Inventor 孙丽华张雅君陈雪如冯萃敏许萍
Owner 清上(苏州)环境科技有限公司
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