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Method for reducing chemical oxygen demand of zeolite molecular sieve production wastewater

A technology of zeolite molecular sieve and chemical oxygen demand, which is applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve the problems of reducing COD value, complexity, and high ammonia nitrogen, and achieves the effect of simple process and easy operation

Inactive Publication Date: 2015-07-15
DALIAN LIGONG QIWANGDA CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] Zeolite molecular sieve production wastewater has its particularity in composition, containing a large amount of suspended matter, high COD value, high salinity, and high ammonia nitrogen. The methods for reducing COD of zeolite molecular sieve production wastewater in the prior art are relatively complicated
[0013] For zeolite molecular sieve production wastewater containing quaternary ammonium salts, quaternary ammonium bases or organic amines, no simple light treatment has been used so far to effectively reduce its COD value

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Get 200ml 200ppm tetrapropyl ammonium bromide solution, add hydrogen peroxide to wherein make initial H 2 o 2 Concentration C H2O2 0 =0.15M, this solution was added to the quartz reactor. Heating in a constant temperature bath, set the temperature to 20°C, turn on the UV lamps (2, each 125W, wavelength 254nm) after the temperature is stable, take a sample every half an hour, and measure the pH value of the water sample with the Lei Magnetic PHS-3C precision pH meter , Microwave digestion method to determine its COD (chemical oxygen demand) value. The results showed that after 1 hour of light treatment, the COD value decreased from the initial 432mg / L to 92mg / L, and the COD removal rate was 78.7%. L). At the same time, the pH of the water sample dropped from 6.08 to 3.63.

Embodiment 2

[0036] Get 200ml 300ppm tetrapropyl ammonium bromide solution, add hydrogen peroxide to wherein make initial H 2 o 2 Concentration C H2O2 0 =0.15M, this solution was added to the quartz reactor. Heating in a constant temperature bath, set the temperature to 20°C, turn on the UV lamps (2, each 125W, wavelength 254nm) after the temperature is stable, take a sample every half an hour, and measure the pH value of the water sample with the Lei Magnetic PHS-3C precision pH meter , Microwave digestion method to determine its COD (chemical oxygen demand) value. The results showed that after 3 hours of light treatment, the COD value decreased from the initial 720mg / L to 96mg / L, and the COD removal rate was 86.7%. L). At the same time, the pH of the water sample dropped from 5.94 to 3.58.

Embodiment 3

[0038] Get 200ml 500ppm tetrapropyl ammonium bromide solution, add hydrogen peroxide to wherein make initial H 2 o 2 Concentration C H2O2 0 =0.15M, this solution was added to the quartz reactor. Heating in a constant temperature bath, set the temperature to 20°C, turn on the UV lamps (2, each 125W, wavelength 254nm) after the temperature is stable, take a sample every half an hour, and measure the pH value of the water sample with the Lei Magnetic PHS-3C precision pH meter , Microwave digestion method to determine its COD (chemical oxygen demand) value. The results showed that after 1 hour of light treatment, the COD value decreased from the initial 1008 mg / L to 653 mg / L, and the COD removal rate was 35.2%; after 2 hours of light treatment, the COD value decreased to 293 mg / L, and the COD removal rate was 70.9%; After 3 hours of treatment, the COD value decreased to 182mg / L, and the COD removal rate was 81.9%; after 4 hours of light treatment, the COD value decreased from ...

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Abstract

The invention discloses a method for reducing the chemical oxygen demand of zeolite molecular sieve production wastewater by one-step illumination technique. The method is characterized in that hydrogen peroxide is added into zeolite molecular sieve production wastewater to generate hydroxyl free radicals with superstrong oxidizing ability under ultraviolet irradiation so as to conduct oxidative degradation on the organic nitrogen-containing compound in the zeolite molecular sieve production wastewater, and the organic nitrogen-containing compound is one or more of a quaternary ammonium salt, quaternary ammonium base, and organic amine. Compared with traditional methods, the method provided by the invention simplifies the treatment process, saves the treatment time, and is easy to operate. For wastewater containing quaternary amine base and organic amine, the method provided by the invention can directly treat the wastewater without adding acid to conduct neutralization, and the treated water sample is close to neutral.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a method for reducing the chemical oxygen demand of zeolite molecular sieve production wastewater. Background technique [0002] Zeolite molecular sieve is a kind of material with uniform pores and regular crystal structure, mainly composed of silicon, aluminum, oxygen and some other metal cations. Due to its unique structure and performance, zeolite molecular sieves can be used as catalysts, adsorbents and ion exchangers, and are widely used in petrochemical, environmental protection, food industry, pharmaceutical and chemical industries. [0003] Using zeolite molecular sieve as a catalyst can develop many environmentally friendly new processes to replace the old processes with serious pollution. However, the production process of zeolite molecular sieve itself is not environmentally friendly. Many molecular sieves, such as ZSM-5 and TS-1, require the use of template...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/32C02F1/72C02F101/38
CPCC02F1/32C02F1/722C02F2305/023C02F2101/38
Inventor 李钢钟鹏飞
Owner DALIAN LIGONG QIWANGDA CHEM TECH
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