Active coke modifying method and application method for removing heavy metal in recycled water by using modified active coke

An application method and technology of activated coke, applied in the field of modified activated coke, can solve problems such as high input and removal effect, and achieve the effects of low engineering investment cost, enhanced hydrophilicity, and reduced treatment cost

Active Publication Date: 2014-07-02
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

The cost of activated coke is much lower than that of powdered activated carbon, and it has a certain adsorption and removal effect on heavy metal ions in water, 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

[0026] 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. Lead ions in raw water (Pb 2+ ) content is 0.15mg / L, and the dosage of powdered activated carbon is 30mg / L, but the treatment effect is not ideal, showing that Pb in membrane effluent 2+ The content is relatively high, and the removal rate is only 15%.

[0027] Adopt the method of the present invention to carry out active coke modification: (1) sieve the active coke to obtain the size is 200~300 mesh particles, then place it in the chlorine-containing solution of 2500mg / L and stir and soak for 60min, then soak repeatedly with tap water Wash for a total of 60 minutes, and place the cleaned active coke at 300°C. Heating at ℃ for 10h; (2) The hydrogen ion concentration of the nitric acid solution is 8mol L -1 , stirring and mixing active coke and...

Embodiment 2

[0030] 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. Chromium ions in raw water (Cr 3+ ) is 0.25mg / L, and the dosage of powdered activated carbon is 40mg / L, but the treatment effect is not ideal, showing that Cr in membrane effluent 3+ The content is relatively high, and the removal rate is 20%.

[0031] Adopt the method of the present invention to carry out active coke modification: (1) sieve the active coke to obtain the particle size that is 200~300 meshes, then place it in 2000mg / L chlorine-containing solution and stir and soak for 30min, then soak repeatedly with tap water Wash for a total of 60 minutes, and set the cleaned active coke at 250. Heating at ℃ for 8h; (2) The hydrogen ion concentration of the sulfuric acid solution is 12mol L -1 , the active coke and sulfuric acid were stirred and mixed for 12 ho...

Embodiment 3

[0034] 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. Cadmium ions in raw water (Cd 2+ ) is 0.04mg / L, and the dosage of powdered activated carbon is 40mg / L, but the treatment effect is not ideal, showing that Cd in membrane effluent 2+ The content is relatively high, and the removal rate is 18%.

[0035]Adopt the method of the present invention to carry out active coke modification: (1) sieve the active coke to obtain the size is 200~300 mesh particles, then place it in 5000mg / L chlorine-containing solution and stir and soak for 30min, then soak repeatedly with tap water Wash for a total of 60 minutes, and place the cleaned active coke at 300°C. Heating at ℃ for 12h; (2) The hydrogen ion concentration of the sulfuric acid solution is 13mol L -1 , the active coke and sulfuric acid were stirred and...

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Abstract

The invention belongs to the technical field of the treatment of recycled water, and particularly relates to an active coke modifying method and an application method for removing heavy metal in recycled water by using the modified active coke. The invention provides the active coke modifying method and the application method of the modified active coke, aiming at solving the problem that the membrane outlet water contains high heavy metal content in a recycled water factory adopting a membrane treatment technology. The implementation steps are as follows: pre-treating the active coke, preliminary oxidizing by chlorine and carrying out heat treatment, mixing and blending with high-oxidability acid according to proportion for sufficient time, and carrying out heating treatment to modify the active coke; feeding the modified active coke into a membrane pool to improve the hydrophilia, namely, the polarity on the surface of the active coke according to the content of the acid oxygen-containing functional group (carboxyl, phenolic hydroxyl group, ester group and the like) added on the surface of the modified active coke, so as to improve the adsorption removal effect of the heavy metal in the water. The active coke modifying method and the application method can be used for deeply purifying the two-stage outlet water of the urban sewage plant, and can be used for the recycled water treatment engineering which takes water discharged out of the urban sewage plant or the rain water as water source.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to an active coke modification method for removing heavy metals in regenerated water and an application method of the modified active coke. Background technique [0002] The recycling of urban sewage is one of the effective ways to solve the current shortage of water resources. Many cities in my country have taken urban sewage recycling rate as an important indicator of urban development planning, but due to the complexity of urban sewage water quality and the multiple ways of reclaimed water reuse, the reclaimed water system that uses the secondary effluent of urban sewage treatment plants as the source of reclaimed water The water quality safety must arouse people's enough attention. There are many types of pollutants in reclaimed water, among which heavy metals (such as mercury, cadmium, lead, chromium and metal arsenic, etc.) have a greater impact on groundwa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30C02F9/02C02F1/28
Inventor 孙丽华张雅君冯萃敏许萍俞天敏
Owner 清上(苏州)环境科技有限公司
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