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Depth processing method of cyanogen-containing waste water

A technology for advanced treatment of cyanide wastewater, applied in the directions of oxidized water/sewage treatment, ion-exchanged water/sewage treatment, etc., can solve the problem of cyanide removal that is not mentioned, and achieve good treatment effect, long continuous operation time, and simple operation. Effect

Active Publication Date: 2014-04-16
EAST CHINA UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this process does not mention the removal of cyanide in wastewater, and in the treatment step, an adjustment tank needs to be set up for pH adjustment and oxidation reaction, and the supernatant after the reaction still needs to be filtered.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1. Resin pretreatment:

[0035] Take 0.2m 3 201×4 type anion exchange resin, add 0.8m 3 Soak in deionized water for 24 hours, and then place it in 1m 3 The mass concentration of 2% NaOH solution soaked for 6h, the resin into OH - type.

[0036] 2. Preparation of anion exchange resin loaded with hypochlorite:

[0037] Sodium hypochlorite solution with a commercially available active chlorine concentration of 10% was added at 15°C and 0.1m 3 Under the condition of the load flow rate of / h, it passes through the fixed bed adsorption column packed with 201×4 type anion exchange resin, and the load time is 2h, and the hypochlorite is loaded on the resin; The theoretical exchange capacity ratio is 1:3, and the amount of sodium hypochlorite is used to generate ClO with chlorine-based oxidants. - Measured as CN in cyanide-containing wastewater - 1 molar amount of .

[0038] 3. Advanced treatment of cyanide-containing wastewater

[0039] The total cyanide concentration ...

Embodiment 2

[0043] 1. Resin pretreatment

[0044] Take 0.75m 3 201×7 type ion exchange resin, add 3.0m 3 Soak in deionized water for 24 hours, then place at 3.75m 3 Soak in 6% NaOH solution for 4 hours to turn the resin into OH - type.

[0045] 2. Preparation of anion exchange resin loaded with hypochlorite:

[0046] Prepare 20% chlorine dioxide solution at 30°C and 0.3m 3 Under the condition of loading flow rate of / h, it passes through the fixed bed adsorption column packed with 201×7 type anion exchange resin, and the loading time is 1.5h, and the hypochlorite is loaded on the resin; The theoretical exchange capacity ratio of the resin is 1:2, and the amount of chlorine-based oxidant that produces hypochlorite is the same as that of chlorine-based oxidant to produce ClO - Measured as CN in cyanide-containing wastewater - 2.5 molar times of the amount.

[0047] 3. Advanced treatment of cyanide-containing wastewater

[0048] The total cyanide concentration is 2.8mg / L, the COD va...

Embodiment 3

[0052] 1. Resin pretreatment

[0053] Take 0.5m 3 201×2 type ion exchange resin, add 2m 3 Soak in deionized water for 24 hours, and then put it in 3m 3 Soak in 10% NaOH solution by mass for 3 hours to convert the resin to OH - type.

[0054] 2. Advanced treatment of cyanide-containing wastewater

[0055] Oxidant mixed with biochemical treatment effluent: mix commercially available sodium hypochlorite solution with active chlorine concentration of 30% by mass at 35°C with 5m 3 The total cyanide concentration is 2.8mg / L, the COD value is 50mg / L-500mg / L, the BOD is 30mg / L-300mg / L, and the biochemical treatment effluent of coking wastewater with a chromaticity of 80-150 is mixed evenly to make the activity in the mixed solution The chlorine concentration is 60mg / L.

[0056] Put the mixed waste water in step 2 at 35°C and 10m 3 / (m 3 h) under the condition of passing through a fixed-bed adsorption column filled with 201 × 2 type ion exchange resins; when the reaction was ca...

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PUM

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Abstract

The invention discloses a depth processing method of cyanogen-containing waste water. The method comprises the following step of treating the cyanogen-containing waste water with chlorine oxidizing agent generating hypochlorite and anion exchange resin. The method is specifically one of the following modes: 1. mixing well the cyanogen-containing waste water and the chlorine oxidizing agent generating hypochlorite and treating the mixture with the anion exchange resin; 2. treating the cyanogen-containing waste water with anion exchange resin loaded with hypochlorite. The method needs no equalizing tank, oxidation reaction tank or filtering treatment, greatly saves sewage treatment place and effectively treats total cyanide in the cyanogen-containing waste water to realize stable and standard reached discharge and satisfy industrial water quality in municipal sewage regeneration and utilization.

Description

technical field [0001] The invention belongs to the technical field of environmental protection engineering, and in particular relates to an advanced treatment method for cyanide-containing wastewater. Background technique [0002] Cyanide-containing wastewater refers to wastewater containing various cyanides. In industrial production, the wet extraction of gold and silver, the production of chemical fibers, coking, synthetic ammonia, electroplating, gas production and other industries will involve the use of cyanide or by-product cyanide, so a certain amount of cyanide will be emitted during the production process. Wastewater, but due to different industries and specific processes involved, the composition and content of each cyanide-containing wastewater are very different. [0003] Cyanide in water can be divided into simple cyanide and complex cyanide. Simple cyanides include salts of alkali metals (sodium, potassium, ammonium) (alkali cyanides) and salts of other meta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/76C02F1/42
Inventor 周彦波郭少鹏张佳鲁军蔡国光杨秀玉李光先丁罕文钱红
Owner EAST CHINA UNIV OF SCI & TECH
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