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Method for treating high-concentration mixed organic wastewater by using chromium-containing waste liquid

A technology for organic wastewater and waste liquid treatment, applied in separation methods, chemical instruments and methods, neutralized water/sewage treatment, etc., can solve problems such as deterioration of the environment, accumulation of organic toxic substances, carcinogenicity, etc., and achieve the effect of reducing waste of resources

Inactive Publication Date: 2016-10-12
四川欣欣环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] High-concentration mixed organic wastewater has a high concentration of organic matter, and some cod is even as high as hundreds of thousands of milligrams per liter. The structure of organic matter is stable, the biodegradability is poor, and it has certain biological toxicity.
If it is discharged directly without treatment, it will deteriorate the environment, and a large amount of organic toxic substances will accumulate in the receiving water or soil, and eventually enter the human body, thereby endangering human health.
However, the organic structure of high-concentration mixed organic wastewater is easily destroyed in a strong oxidizing environment.
The heavy metal chromium is a harmful substance that can accumulate in the environment and the human body and have long-term adverse effects on the human body. Excessive intake of chromium or long-term exposure to chromium-containing wastewater can cause cancer to the human body.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1: The COD of pharmaceutical wastewater from a pharmaceutical factory is 150,000 mg / L, and the main components are high molecular organic substances. Add 6L of 0.85 mol / L chromium-containing waste liquid, and react for 4 hours at 90°C and an acidity (calculated as sulfuric acid) of 0.6mol / L. The acidic organic gas in the reaction process is absorbed by sodium hydroxide solution, and the reaction is completed. Sodium hydroxide solution is used to neutralize pressure filtration, chromium hydroxide is recycled, and the filtrate and tail gas treatment liquid are subjected to anaerobic and contact oxidation biochemical treatment. The total chromium content in the discharged water is 0.35mg / L, the cod is 89.5mg / L, and the ammonia nitrogen is 10.25 mg / L, and other indicators have reached the national first-class discharge water discharge standard.

Embodiment 2

[0019] Example 2: The COD of wastewater from an aniline manufacturer is 85000 mg / L, the ammonia nitrogen is 278.89 mg / L, and the main component is aniline. Add 5L of 0.85 mol / L chromium-containing waste liquid, and react for 5 hours at 85°C and an acidity (calculated as sulfuric acid) of 0.75 mol / L. The acidic organic gas in the reaction process is absorbed by sodium hydroxide solution, and the reaction is completed. Sodium hydroxide solution is used to neutralize pressure filtration, chromium hydroxide is recycled, and the filtrate and tail gas treatment liquid are subjected to anaerobic and contact oxidation biochemical treatment. The total chromium content in the discharged water is 0.43mg / L, the cod is 92.7mg / L, and the ammonia nitrogen is 13.25 mg / L, and other indicators have reached the national first-class discharge water discharge standards.

Embodiment 3

[0020] Example 3: The COD of the still liquid in a hazardous waste recovery unit is 22350 mg / L, the ammonia nitrogen is 192.75 mg / L, and the composition is complex. Add 4L of 0.54mol / L chromium-containing waste liquid, react for 3 hours at 95°C and acidity (calculated as sulfuric acid) 0.05mol / L, and react for 3 hours. The acidic organic gas in the reaction process is absorbed by sodium hydroxide solution, and the reaction is completed. Sodium hydroxide solution is used to neutralize pressure filtration, chromium hydroxide is recycled, and the filtrate and tail gas treatment liquid are subjected to anaerobic and contact oxidation biochemical treatment. The total chromium content in the discharged water is 0.22mg / L, the cod is 74.5mg / L, and the ammonia nitrogen is 3.24. mg / L, and other indicators have reached the national first-class discharge water discharge standards.

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PUM

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Abstract

The invention discloses a method for treating high-concentration mixed organic wastewater by using chromium-containing waste liquid. The method is characterized in that the chromium-containing waste liquid is uniformly mixed with organic wastewater according to certain proportion; at certain acidity and temperature, organic matters are oxidized by hexavalent chromium, and the structures of the organic matters are broken to facilitate biochemical treatment; after the reaction, neutralization is performed, and the chromium is (reduced) precipitated and separated out for recycling; and the tail gas in the oxidation process is absorbed by alkaline liquid, and the clear liquid and tail gas treatment liquid are directly subjected to biochemical treatment. In the invention, the high-concentration mixed organic wastewater is treated by using the hexavalent chromium-containing waste liquid, and the chromium content and the organic wastewater after the direct biochemical treatment can reach the national discharge standard; and meanwhile, the chromium can be recycled, the resource waste is reduced, and certain economic value is created.

Description

technical field [0001] The invention relates to the field of organic wastewater treatment; the invention relates to a method for treating high-concentration mixed organic wastewater with chromium-containing waste liquid. Background technique [0002] High-concentration mixed organic wastewater has a high concentration of organic matter, and some cods are even as high as hundreds of thousands of milligrams per liter. The organic matter has a stable structure, poor biodegradability, and certain biological toxicity. If it is discharged directly without treatment, it will deteriorate the environment, and a large amount of organic toxic substances will accumulate in the receiving water or soil, and eventually enter the human body, thereby endangering human health. However, the organic structure of high-concentration mixed organic wastewater is easily destroyed in a strong oxidizing environment. The heavy metal chromium is a harmful substance that can accumulate in the environmen...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F101/22
CPCC02F9/00B01D53/78C02F1/66C02F1/72C02F3/30C02F2101/22
Inventor 陈强黄京卓俊清赵海成
Owner 四川欣欣环保科技有限公司