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Method for treating degradation-resistant organic pollutants in waste water

A technology for treating organic pollutants and waste water, applied in water pollutants, chemical instruments and methods, neutralized water/sewage treatment, etc. The removal rate, process conditions are easy to control, and the effect of overcoming temperature conditions

Inactive Publication Date: 2013-12-04
CHANGSHU CITY YUHENG KNITTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The use of iron nanoparticles for wastewater treatment has been reported in the prior art. However, due to the small particle size and high surface activity of the nanoparticles, they are easily agglomerated in the solution, making it difficult to apply in industrial production.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Self-made chlorobenzene industrial wastewater with COD initial concentration of 1000mg / L, adjusted pH to 3, according to n(H 2 o 2 ):n(Fe 2+ )=10, first put ferrous sulfate heptahydrate into the waste water, then drop 0.05g nanometer iron ferric oxide particles into every 100mL of waste water, and then according to m(H 2 o 2 ):m(COD)=0.8, adding hydrogen peroxide, pneumatic ultrasonic 60min at room temperature (20-25℃), pneumatic ultrasonic frequency 20kHz, COD removal rate reached 100%.

Embodiment 2

[0036] Self-made chlorobenzene industrial wastewater with an initial concentration of COD of 3000mg / L, adjusted pH to 1, according to n(H 2 o 2 ):n(Fe 2+ ) = 1, first put ferrous sulfate heptahydrate into the waste water, then drop 0.01g nano ferric oxide particles into every 100mL of waste water, and then according to m(H 2 o 2 ):m(COD)=1.2, adding hydrogen peroxide, pneumatic ultrasonication at room temperature (20-25°C) for 60min, pneumatic ultrasonic frequency 50kHz, COD removal rate reached 94.5%.

Embodiment 3

[0038] Self-made chlorobenzene industrial wastewater with COD initial concentration of 2000mg / L, adjusted pH to 5, according to n(H 2 o 2 ):n(Fe 2+) = 10, first put ferrous sulfate heptahydrate into the waste water, then drop 0.1g nano ferric oxide particles into every 100mL of waste water, and then according to m(H 2 o 2 ): m(COD) = 0.4 by adding hydrogen peroxide, at room temperature (20-25 ℃) pneumatic ultrasonic 5min, pneumatic ultrasonic frequency 30kHz, COD removal rate reached 99.7%.

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Abstract

The invention provides a method for treating degradation-resistant organic pollutants in waste water and overcomes the defect that iron nanoparticles are prone to agglomeration when the iron nanoparticles are subjected to waste water treatment in the prior art. In order to solve the technical problem, the technical scheme includes that the method includes the following steps: under the pneumatic ultrasonic action, adjusting pH to be 1-5, adding ferrous ion salt, casting the iron nanoparticles in, adding hydrogen peroxide, performing solid-liquid separation after the pneumatic ultrasonic action, and discharging the waste water after the waste water reaches the standard. Comparing a pneumatic ultrasonic field with a common electric ultrasonic field, dispersion and radiation range can be widened, and the iron nanoparticles can be dispersed in the waste water more easily; air serves as a medium generating the pneumatic ultrasonic field, functions of an oxidizing agent (O2), stirring and cutting are provided for a waste water treating system, but only an air compressor generating the pneumatic ultrasonic field is energy-consuming equipment, so that energy-saving effect is achieved.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, in particular to a treatment method for refractory organic pollutants in waste water. Background technique [0002] With the rapid development of industry and the rapid economic growth, the discharge of various types of industrial wastewater is also increasing year by year. Among them, due to the complexity of its components, high-concentration organic wastewater has been difficult to meet the economic and technical requirements by general wastewater treatment methods. Therefore, seeking efficient methods to treat high-concentration organic wastewater has become a hot spot of common concern among scholars at home and abroad. [0003] There are many methods for treating chlorobenzene-containing wastewater, in addition to common physical methods, chemical methods, and biological methods, there are also sludge irrigation methods, groundwater injection methods, and ocean discharge methods. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/08C02F1/66C02F1/36C02F1/72C02F101/30
Inventor 冯俊生徐佩佩
Owner CHANGSHU CITY YUHENG KNITTING
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