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Manganese oxide for dephenolization and method for processing high concentration phenol wastewater

A manganese oxide, the purpose of the technology, applied in the field of trivalent manganese oxide, high-concentration phenol-containing wastewater treatment, can solve the problems that cannot be used as biochemical methods, treatment of influent concentration, waste of water resources, etc., to reduce treatment operating costs , fast response, less dosage effect

Inactive Publication Date: 2008-09-24
PEKING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current relatively economical extraction method is often only good for the separation of unit phenols, and the concentration of polyphenols in the effluent after treatment is still thousands of mg / L, and this high-concentration polyphenols can inhibit the growth of microorganisms, and cannot be used as a biochemical The concentration of the incoming water is treated by the method, and it is often extensively diluted with water and then treated by the biochemical method
For gas coking enterprises with an output of hundreds of tons of water per hour, the waste of water resources is serious, the amount of dilution water is large, and the treatment cost is high. It is eager to develop a new method for the treatment of polyphenols with special effects

Method used

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  • Manganese oxide for dephenolization and method for processing high concentration phenol wastewater
  • Manganese oxide for dephenolization and method for processing high concentration phenol wastewater
  • Manganese oxide for dephenolization and method for processing high concentration phenol wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1. Preparation of phenol-removing material

[0021] Industrial grade MnSO produced by Guangxi manganese mine 4 ·H 2 O and caustic soda with a purity of > 96% are used as raw materials to prepare the manganese oxide. Utilize 0.2M MnSO in 500mL reaction system 4 ·H 2 The O solution was reacted with 0.4M NaOH solution, and at room temperature, aeration (30 L / min of air), shaking and stirring (100 r / min) for reaction for 3 hours, dehydration after filtration, washing, air-drying, crushing and sieving, Take 200-260 mesh samples for wastewater treatment. The manganese oxide prepared by the present invention mostly has needle-like and rod-shaped nano-scale single crystals with a diameter of about tens of nanometers ( figure 1 ).

Embodiment 2

[0022] Example 2. Influencing factors of wastewater treatment experiments

[0023] Add a certain amount of 200-260 mesh manganese oxide sample and 50mL waste water sample into the conical flask, use 1M H 2 SO 4 Adjust the pH value, then put it into a water bath constant temperature oscillator, shake it for a certain time at a certain temperature and a rotation speed of 150r / min, and filter it for the measurement of the phenol concentration. The phenol concentration was measured in terms of phenol and was measured with reference to the bromination titration method commonly used in the domestic industry, and the pH value was measured with a Sartorius PB-10 pH meter. The phenolic wastewater comes from a gasification plant in Harbin and is treated by extraction method. The initial phenol concentration is 969.0 mg / L, the COD value is 5478 mg / L, and the pH is 7.25.

[0024] (1) Influence of initial pH value (see Table 1)

[0025] The initial pH value has a great influence on the ...

Embodiment 3

[0040] Embodiment 3, the reuse of manganese oxide (see Table 5)

[0041] Add 2 grams of 200-260 mesh manganese oxide samples and 50 mL of waste water samples that have been used once and twice in the conical flask, respectively, and use 1 M H 2 SO4 Adjust the pH value, then put it into a water bath thermostatic oscillator, and shake it for 2 hours at 25° C. and a rotating speed of 150 r / min.

[0042] With the increase of the number of repetitions, the phenol removal effect of the repeated manganese oxides decreased, but adjusting the pH value with the appropriate supplementary acid content could promote the improvement of the phenol degradation rate, and the surface properties of the samples changed after use. To the same pH, less acid is required than as is. Therefore, the synthesized manganese oxide can be reused and has a good application prospect.

[0043] Table 5. Effect of repeated use of manganese oxides on phenol removal efficiency

[0044]

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Abstract

The invention provides a manganese oxide for eliminating phenol and a method for treating wastewater containing high concentration phenol. Manganese sulfate and caustic soda solution, the molar ratio of which is 1:2, are mixed to be aerated for 3 to 5 hours at room temperature, and after the filtration of a reaction product, dehydration, washing and drying are carried out. After grinding, 100 to 300 mu of powder are filtered, and the manganese oxide of the invention is obtained. The manganese oxide is put in the wastewater containing high concentration phenol, the PH value of the solution is adjusted to below 4, and the stirring reaction is carried out for over 0.5 hours. Then, stewing for precipitation is carried out for a period, and supernatant liquor can be discharged to be used as biochemical treatment entering water, Compared with natural mineral manganese, the manganese oxide synthetized by the invention has the advantages of high purity, little dosage and high activity, and the manganese oxide can be utilized repeatedly until being depleted. The technology for treating phenol wastewater is easy to operate, and besides, a certain acid consumption, other conditions and requirements are not needed. The PH value of the wastewater after treatment rises to be close to neutral, and secondary pollution brought by acidic wastewater can not be brought about.

Description

technical field [0001] The invention belongs to the field of wastewater treatment, and particularly relates to manganese oxides and a method for treating high-concentration phenol-containing wastewater with the manganese oxides. Background technique [0002] At present, the high concentration of chemical oxygen consumption (COD) in surface and groundwater bodies in my country is worrying and needs to be effectively curbed. It is the SO in the gas generated in the coal utilization that causes the high pressure of the emission of environmental pollutants in my country. 2 and COD in water, among which the COD in a large amount of effluent discharged from coal gas coking production is mainly caused by phenolic substances. Obviously, to achieve COD emission reduction in the gas coking industry, it is urgent to develop new phenol removal technologies. [0003] At present, the combination of extraction method and biochemical method is commonly used in the treatment of phenol-cont...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/02C02F9/14C02F1/72
Inventor 鲁安怀范晨子王长秋
Owner PEKING UNIV