Oil refining wastewater composite treating agent and preparation method thereof

A technology for composite treatment and refinery wastewater, applied in the direction of adsorption water/sewage treatment, flocculation/sedimentation water/sewage treatment, chemical instruments and methods, etc., can solve the problems of small adsorption capacity of porous materials, high cost of oil-absorbing resin, poor adsorption selectivity, etc. problem, to achieve the effect of increasing the specific surface area of ​​adsorption, facilitating post-treatment, and good chelation

Inactive Publication Date: 2013-10-09
CHONGQING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Commonly used flocculants are divided into two types: organic flocculants and inorganic flocculants. Inorganic flocculants are mainly polyferric sulfate and polyaluminum chloride. Such flocculants are used in large quantities and are prone to generate a large amount of sludge.
The organic flocculant is mainly polyacrylamide, which will cause secondary pollution;
[0006] Adsorption method, which uses inorganic porous materials such as activated carbon, diatomaceous earth, bentonite, zeolite, or organic materials such as oil-absorbing resins to adsorb organic matter in wastewater, but the adsorption capacity of porous materials is small, the adsorption selectivity is poor, and the cost of oil-absorbing resins is high. , there are certain deficiencies

Method used

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Experimental program
Comparison scheme
Effect test

preparation example Construction

[0032] The preparation method of oil refinery wastewater composite treatment agent comprises the following sequence and steps:

[0033] a. Grinding the porous mineral to 200 mesh;

[0034] b. Roast the porous minerals ground to 200 mesh in a muffle furnace for 1-10 hours at a temperature of 200-500°C;

[0035] c. Add 0.1-5wt% foaming agent to the modified porous mineral by weight percentage, and mix evenly in a high-speed mixer;

[0036] d. Spray 0.05-0.2ml of chitosan solution per gram according to the mixed weight;

[0037] E, then carry out granulation with granulator, particle diameter is 0.5-5mm;

[0038] f. Heat the granules obtained by granulation at 50-150°C in an oven for 30min-4h to foam to obtain a finished product.

Embodiment 1

[0040] 500g of bentonite was calcined at 300°C for 3 hours, 10g of sodium bicarbonate was added, and stirred and mixed evenly in a high-speed mixer. Dissolving chitosan in the acetic acid solution of 3wt% makes concentration be the chitosan solution of 0.02g / ml, add 25ml chitosan solution in the mixture of bentonite and sodium bicarbonate and carry out granulation, make particle size The granules are 0.5-2mm, and the prepared granules are heated and foamed in an oven at a temperature of 80°C for 1 hour to obtain a finished product.

Embodiment 2

[0042] Mix 200g of expanded perlite and 200g of zeolite and roast at 400°C for 4 hours, add 1g of sodium bicarbonate, and stir and mix evenly in a high-speed mixer. Chitosan is dissolved in the acetic acid solution of 2wt% to make concentration be the chitosan solution of 0.2g / ml, add 40ml chitosan solution in the mixture of expanded perlite, zeolite and sodium bicarbonate and carry out granulation, Granules with a particle size of 1-5mm are prepared, and the prepared granules are heated and foamed in an oven at a temperature of 100° C. for 2 hours to obtain a finished product.

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Abstract

The invention discloses an oil refining wastewater composite treating agent and a preparation method thereof. The treating agent is composed of porous minerals, a foaming agent and a chitosan solution. The preparation method comprises the steps of: roasting the porous minerals; adding the foaming agent; spraying the chitosan solution; granulating by a granulating machine; and foaming by heating in an oven to produce the oil refining wastewater composite treating agent. For heavy metal ions, the chitosan is good in chelation; the foaming agent increases the specific surface area; and due to non-uniform mixing of the mineral materials and the foaming agent, different grain sizes of the granulated particles and different densities of the produced oil refining wastewater composite treating agents, partial treating agents can float on the water level and partial treating agents can be dispersed in the water to adsorb floating oil, emulsified oil, dispersed oil and the like in the wastewater. The long molecular chain of the chitosan can net and flocculate large pollutant particles; after the chitosan is compositely foamed with the mineral material with big specific surface area, contact points with the pollutants are added; and the adopted mineral material and chitosan are nontoxic and harmless, so that no secondary pollution is caused. The preparation method, disclosed by the invention, has the advantages of simple production technology and low production cost.

Description

Technical field: [0001] The invention relates to an activator for wastewater treatment, in particular to a preparation method of a chitosan composite water treatment agent using porous minerals as a carrier. Background technique: [0002] Refinery wastewater is the production wastewater generated in petroleum processing, and its composition is complex, mainly containing a large amount of oil, phenols, sulfides, ammonia nitrogen and various heavy metals. Existing treatments are often ineffective, such as: [0003] Gravity sedimentation method, which uses the density difference between oil and water to separate the oil-water mixture under the action of gravity, is one of the most common processing methods, but this method cannot handle dispersed oil and emulsified oil; [0004] Filtration method, which can remove suspended solids and dissolved oil in water by using a filter layer or a microporous membrane, but the filter needs to be washed frequently, which is not conducive t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F1/56
Inventor 曾路彭小芹李予晋周燕王铁夫张延洁
Owner CHONGQING UNIV
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