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A method for treating industrial wastewater by catalyzing the oxidation of sphalerite with hydrogen peroxide

A technology of sphalerite and industrial wastewater, which is applied in the direction of oxidized water/sewage treatment, etc., can solve the problems affecting the chroma of effluent and its reuse, refractory iron-containing sludge, and narrow pH range, so as to improve the resources Effects of utilization efficiency, easy recycling, and wide pH range

Inactive Publication Date: 2015-10-28
DONGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0025] The Fenton oxidation reaction starts quickly, the oxidation efficiency is high, and the reaction conditions are mild; the equipment is simple, the energy consumption is small; the operation process is stable and reliable, and the operation is simple and convenient. left and right), iron ions remain in the effluent, affecting the chroma of the effluent and its reuse
In addition, a large amount of refractory iron-containing sludge is often produced during the reaction process, causing secondary pollution

Method used

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  • A method for treating industrial wastewater by catalyzing the oxidation of sphalerite with hydrogen peroxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Add sphalerite enriched by flotation, magnetic separation and pickling into a 2.5m×2m×1.5m reaction tank filled with printing and dyeing wastewater biochemical effluent (secondary effluent, COD93mg / L), and sphalerite The dosage is 2.5g / L. After mixing evenly, adjust the pH value of the wastewater to 3-5, and then pump H from the hydrogen peroxide storage tank 2 o 2 , the dosage is 135mg / L, and the aeration device at the bottom of the reaction tank is turned on, so that the sphalerite is in a suspended state in the reaction tank. After 30 minutes of reaction, the sphalerite and water were separated by a solid-liquid separation device, the COD and TOC values ​​of the effluent were measured, and the COD and TOC removal rates were calculated. The results show that the biochemical effluent of printing and dyeing wastewater treated with sphalerite has a COD removal rate of up to 87.3%, and a TOC removal rate of up to 75.6%, which is 16.1 percentage points higher than the tr...

Embodiment 2

[0058] Add sphalerite enriched by flotation, magnetic separation and pickling into a 2.5m×2m×1.5m reaction tank filled with dye wastewater biochemical effluent (secondary effluent, COD186mg / L), and sphalerite The dosage is 3g / L. After mixing evenly, adjust the pH value to 2, 3, 5, 7, 9 respectively, pump in H 2 o 2 , the dosage is 270mg / L, open the aeration device at the bottom of the reaction tank to react for 120min, measure the COD and TOC values ​​of the oxidation reaction effluent of the solid-liquid separation device, and calculate the COD and TOC removal rates. The COD removal rates corresponding to pH values ​​of 2, 3, 5, 7, and 9 were 87.3%, 91.8%, 85.3%, 85.7%, and 80.3%, respectively, and the TOC removal rates were 78.4%, 75.5%, 72.6%, and 73.3%, 70.8%. It can be seen that the change of pH value has little effect on the treatment effect. This shows that sphalerite as a catalyst has a good adaptability to the pH of the biochemical effluent of dye wastewater. Aft...

Embodiment 3

[0060] Add sphalerite after flotation, magnetic separation enrichment and pickling into a 2.5m×2m×1.5m reaction tank filled with coking wastewater biochemical effluent (COD150mg / L), and the sphalerite dosage is 2g / L. After mixing evenly, adjust the pH value to 5~6 respectively, pump in H 2 o 2 , the dosage is 230mg / L, and the aeration device at the bottom of the reaction tank is turned on for the reaction. After 60 minutes of reaction, the sphalerite and water are separated by the solid-liquid separation device, the COD and TOC values ​​of the effluent are measured, and the removal of COD and TOC is calculated. Rate. COD removal rate is 86.8%, TOC removal rate is 71.4%. After the sphalerite was reused 10 times, the COD removal rate of the effluent was still above 83%, and the TOC removal rate was about 70%, indicating that the sphalerite as a catalyst can be recovered and reused many times, and the catalytic activity is still high.

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Abstract

The invention relates to a method for oxidizing industrial wastewater with oxydol by using marmatite as a catalyst, which comprises the following steps: grading marmatite subjected to floatation and magnetic separation enrichment to remove fine clay, washing with acid, uniformly mixing with biochemical effluent water of industrial wastewater, regulating the pH value to 2-9, adding oxydol under air agitation fluidization conditions, reacting for 30-120 minutes, discharging clear water by a solid-liquid separator, and returning the marmatite to the fluidized bed for reutilization. The method has the characteristics of favorable treatment effect, wide pH value application range, recyclable catalyst, low treatment cost and the like, does not generate iron-containing sludge, and avoids generating secondary pollution.

Description

technical field [0001] The invention belongs to the field of industrial wastewater treatment, in particular to a method for treating industrial wastewater by catalyzing sphalerite-catalyzed hydrogen peroxide oxidation. Background technique [0002] Industrial wastewater has always been the focus and difficulty of wastewater treatment due to its large discharge volume and high difficulty in treatment. Due to the large differences in production processes, the types of pollutants in industrial wastewater are not the same, and they often have the characteristics of high pollutant concentration, deep color, and refractory degradation. [0003] The treatment methods of industrial wastewater generally include physical methods, chemical methods, biological methods and their combination methods, such as physical-chemical methods, chemical-biological methods, physical-biological methods, etc. In recent years, advanced oxidation technology has been widely used and promoted, and the tr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/72
Inventor 陈泉源马冬梅何晋保汤志涛吕璠璠
Owner DONGHUA UNIV
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