Method for decoloring burned waste water by using zero-valent iron/ultrasonic wave synergistic reaction

A synergistic, zero-valent iron technology, applied in the field of environmental chemistry, to achieve the effect of improving biodegradability and biodegradability

Inactive Publication Date: 2008-08-06
SHENYANG INST OF APPL ECOLOGY CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to reasons such as reaction temperature, pH control, and iron passivation, the use of zero-valent iron alone to remove the color of wastewater has great limitations.

Method used

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  • Method for decoloring burned waste water by using zero-valent iron/ultrasonic wave synergistic reaction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The reactor 3 is placed in an ultrasonic cleaner 4, the reactor 3 is provided with a stirrer 2, and the thermometer 1 is placed in the ultrasonic cleaner 4 to measure the reaction temperature.

[0021] Add 1.0L of waste water and 50g of zero-valent iron powder into the reactor, wherein the properties of the zero-valent iron are: nanoscale iron powder, its purity > 99%, the particle size is 35nm, and the specific surface area is 120m 2 / g; use hydrochloric acid to adjust the pH to 3.0, and then stir the reaction for 30 minutes at an ultrasonic power of 150W and a temperature of 30°C to achieve decolorization of wastewater and COD removal (see Table 1 for decolorization effect).

[0022] Table 1 Comparison of coking wastewater treated by ultrasonic / zero-valent iron synergistic system

[0023]

[0024] It can be seen from Table 1 that the ultrasonic wave / zero-valent iron synergy of the present invention is adopted, and the chromaticity of waste water is reduced f...

Embodiment 2

[0026] The difference from Example 1 is that 1.0L of waste water and 100g of zero-valent iron powder are added to the reactor, wherein the physical properties of the zero-valent iron are: micron-sized iron powder with a purity of 99% and a particle size of 0.04mm , the specific surface area is 1.0m 2 / g; use hydrochloric acid to adjust the pH to 1.0, and then stir and react for 20 minutes at an ultrasonic power of 160W and a temperature of 50°C to achieve decolorization of wastewater and COD removal (see Table 2 for decolorization effect).

[0027] Zero-valent iron / ultrasonic synergistic effect on decolorization of coking wastewater

[0028] It can be seen from Table 2 that increasing the reaction temperature, the amount of zero-valent iron, the ultrasonic power and reducing the initial pH of the wastewater will improve the decolorization effect of the wastewater: the color of the treated wastewater is only 100, and its BOD 5 When the / COD value is increased to 0.38,...

Embodiment 3

[0030] The difference from Example 1 is that 1.0L of waste water and 2g of zero-valent iron powder are added to the reactor, and the zero-valent iron is nano-scale iron powder with a purity of 99%, a particle size of 100nm, and a specific surface area of ​​70m 2 / g; use hydrochloric acid to adjust the pH to 6, and then stir and react for 120 minutes at an ultrasonic power of 200W and a temperature of 10°C to achieve wastewater decolorization and COD removal.

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Abstract

The invention relates to environmental chemistry, in particular to a method for decolorizing coking wastewater by using synergetic effect of zero-valent iron / ultrasonic waves, which specifically comprises the following steps: wastewater and zero-valent iron chips / powders are added into a reactor; the pH value of the wastewater is adjusted to be 1 to 6; then stirring is carried out under the effect of the ultrasonic waves with the power of 150 to 200W; the reaction is lasted for 30 to 60 minutes; the wastewater is decolorized and COD is removed. During the process, the use amount of zero-valent iron in each liter of wastewater is 2 to 500g, and the reaction temperature is 10 to 80 DEG C. By applying the method for decolorizing coking wastewater by using synergetic effect of zero-valent iron / ultrasonic waves, the chromaticity of the coking wastewater can drop from 1,500 times to 140 times, and the removal efficiency can reach over 90 percent; in addition, after the synergetic effect of the zero-valent iron and ultrasonic waves, the removal efficiency of COD in the coking wastewater is higher than the efficiency under the signal effect of the zero-valent iron and the ultrasonic waves. The obtained BOD5 / COD is increased from 0.08 to 0.36, and the biodegradability of the wastewater is also increased remarkably.

Description

technical field [0001] The invention relates to environmental chemistry, in particular to a method for decolorizing coking wastewater by utilizing the synergistic effect of zero-valent iron and ultrasonic waves. Background technique [0002] Coking wastewater is the wastewater formed during high-temperature dry distillation of coal, gas purification, and chemical product refining. It contains dozens of pollutants such as phenol, ammonia nitrogen, cyanide, benzene, pyridine, indole, and quinoline. It is a typical industrial wastewater containing refractory organic compounds with high concentration, high chroma, high toxicity and stable properties. The easily degradable organic substances in coking wastewater are mainly phenolic compounds and benzene compounds, and pyrrole, naphthalene, furan, and imidazole belong to the degradable organic substances. Refractory organic compounds mainly include pyridine, carbazole, biphenyl, terphenyl, etc. The excessive discharge of coking ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/70C02F1/36
Inventor 史荣久徐慧张颖麻威
Owner SHENYANG INST OF APPL ECOLOGY CHINESE ACAD OF SCI
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