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Method for selectively removing thiocyanate radicals in nitrile-containing wastewater

A thiocyanate-selective technology, applied in chemical instruments and methods, water pollutants, natural water treatment, etc., can solve the problems of high requirements for equipment and process conditions, high cost of adding chemicals, and large dosage of added chemicals. The effect of low equipment and process conditions, easy subsequent recovery or treatment, and low equipment loss

Pending Publication Date: 2021-05-07
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Although the above methods have their own advantages, there are still cumbersome and time-consuming treatment processes, large doses of additives, high cost of additives, high requirements for equipment and process conditions, difficult control, low selectivity, large equipment loss, and potential safety hazards, etc. defect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Using the method of the present invention to treat the two-step acid-base wastewater of acrylic fiber wastewater, the mass concentration of thiocyanate is 140 mg / L, and the COD concentration of wastewater is 456 mg / L, wherein the theoretical COD provided by thiocyanate accounts for 32.7% of the total COD. Measure 700mL of waste water and weigh 10g of reducing iron-based material into the reactor, adjust the pH of the system to 3.45, add 0.98mL of 30% H 2 o 2 , open the gas pipeline and continue to aerate for 20 minutes, let it stand for 5 minutes, pour the supernatant into a 1L beaker, adjust the reaction system to be stable to pH=8.79, add a magnetic rotor to the beaker and place it on a magnetic stirrer, and stir for 1 minute at a medium speed , let it stand for 30 minutes, and after flocculation and precipitation, take the supernatant and drain it. After the two-step acid-base wastewater is treated by the method of the invention, the COD of the effluent is 72.5% of ...

Embodiment 2

[0044] Using the method of the present invention to treat a certain coking wastewater, the mass concentration of thiocyanate is 541 mg / L, and the COD concentration of wastewater is 2406 mg / L, wherein the theoretical COD provided by thiocyanate accounts for 22.5% of the total COD. Measure 700mL of waste water and weigh 15g of reducing iron-based materials into the reactor, adjust the pH of the system to 3.23, add 3.78mL of 30% H 2 o 2 Open the gas pipeline and continue to aerate for 20 minutes, let it stand for 5 minutes, pour the supernatant into a 1L beaker, adjust the reaction system to a stable pH=8.99, add a magnetic rotor to the beaker and place it on a magnetic stirrer, and stir for 1 minute at a medium speed. After standing still for 30 minutes to wait for flocculation and sedimentation, take the supernatant and drain it. After the coking wastewater is treated by the present invention, the COD of the effluent is 60.2% of the COD of the original wastewater, and the remo...

Embodiment 3

[0046] Using the method of the present invention to treat a certain coking wastewater, the mass concentration of thiocyanate is 1582mg / L, and the COD concentration of wastewater is 3981mg / L, wherein the theoretical COD provided by thiocyanate accounts for 39.7% of the total COD. Measure 700mL of waste water and weigh 20g of reducing iron-based materials into the reactor, adjust the pH of the system to 3.26, add 11.1mL of 30% H 2 o 2 Open the gas pipeline and continue to aerate for 20 minutes, let it stand for 5 minutes, pour the supernatant into a 1L beaker, adjust the reaction system to be stable to pH=8.89, add a magnetic rotor to the beaker and place it on a magnetic stirrer, and stir for 1 minute at a medium speed. After standing still for 30 minutes to wait for flocculation and sedimentation, take the supernatant and drain it. After the coking wastewater is treated by the present invention, the COD of the effluent is 50.2% of the COD of the original wastewater, and the r...

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Abstract

The invention belongs to the field of environmental engineering wastewater treatment technology application, and particularly relates to a method for selectively removing thiocyanate radicals in nitrile-containing wastewater, which comprises the following steps of: (1) adding a reducing iron-based material and H2O2 into the nitrile-containing wastewater, adjusting the pH value to 3-4, and reacting under a continuous aeration condition; and (2) stopping aeration, standing, taking the supernatant after reaction, adjusting the pH value to 8-9, precipitating and separating. The method is simple and convenient to operate, easy to control, low in equipment and process condition requirements, short in time and capable of efficiently and stably removing the thiocyanate radicals, other components in the waste liquid do not need to be removed firstly, and high selectivity is achieved for removal of the thiocyanate radicals.

Description

technical field [0001] The invention belongs to the application field of environmental engineering wastewater treatment technology, and in particular relates to a method for selectively removing thiocyanate in nitrile-containing wastewater. Background technique [0002] Thiocyanate is the main pollutant in waste liquid, which not only pollutes the environment but also affects water quality. Traditional thiocyanate removal methods include pyrolysis, salt extraction, and degradation. The pyrolysis method has high energy consumption, serious equipment corrosion and poor working environment. Although the salt extraction method protects resources and is beneficial to resource recovery and use, the product purity is not high. The biodegradation method in the degradation method has high requirements on water quality, and the process and results are difficult to control. The chemical degradation method in the degradation method is generally a deep oxidation method, and the consum...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/18C02F103/34
CPCC02F1/722C02F1/66C02F1/72C02F2101/18C02F2103/34C02F2001/007C02F1/38
Inventor 邓睿赵海云李培超段超钱欣
Owner CHINA PETROLEUM & CHEM CORP
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