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Method for treating waste water with organic modified bentonite

A technology for treating wastewater and bentonite, applied in the direction of adsorption water/sewage treatment, etc., can solve the problems of large area of ​​separation equipment, long process flow, difficult solid-liquid separation, etc., achieve small footprint, short process flow, and easy operation low cost effect

Inactive Publication Date: 2012-03-07
厦门紫金矿冶技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the adsorption effect is very good, in practical applications, the treated wastewater needs to be filtered, centrifuged or settled, and there are problems such as difficult solid-liquid separation, large area of ​​separation equipment, and long process flow.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Add an appropriate amount of organic modified bentonite ZJ1 and 10% cement by weight in the disc granulator, wet it with water, shake for 3-20 minutes, form small balls with a diameter of about 0.5-3mm, and air-dry at room temperature. After natural air drying, fill the soil into a glass column with a length of about 15cm and a diameter of 10mm. Use a pump to pump the laboratory self-prepared waste water containing 6mg / L lead at a rate of 1 column volume per hour, pump it into the adsorption column, and carry out countercurrent adsorption. Perform countercurrent desorption, cycle regeneration, and re-adsorption. After treatment, the liquid lead is controlled at 0.05mg / L, and the concentrated liquid lead concentration is 240mg / L.

Embodiment 2

[0028] In the disc granulator, add an appropriate amount of organic modified bentonite ZJ1 and 1% cement by weight, wet it with water, shake it for 3-20 minutes, form small balls with a diameter of about 0.5-3 mm, and air-dry them at room temperature. After natural air drying, fill the soil into a glass column with a length of about 15cm and a diameter of 10mm. Use a pump to pump the laboratory self-prepared waste water containing 6mg / L lead at a rate of 1 column volume per hour, pump it into the adsorption column, and carry out countercurrent adsorption. Perform countercurrent desorption, cycle regeneration, and re-adsorption. After treatment, the liquid lead is controlled at 0.05mg / L, and the concentrated liquid lead concentration is 300mg / L.

Embodiment 3

[0030] Add an appropriate amount of organic modified bentonite ZJ1 and 50% cement by weight into the disc granulator, moisten it with water, shake it for 3-20 minutes, form small balls with a diameter of about 0.5-3mm, and air-dry them at room temperature. After natural air drying, fill the soil into a glass column with a length of about 15cm and a diameter of 10mm. Use a pump to pump the laboratory self-prepared waste water containing 6mg / L lead at a rate of 1 column volume per hour, pump it into the adsorption column, and perform countercurrent adsorption. After 10L of waste water is treated, use 20mL of 20% nitric acid solution Perform countercurrent desorption, cycle regeneration, and re-adsorption. After treatment, the liquid lead is controlled at 0.05mg / L, and the concentrated liquid lead concentration is 409mg / L.

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Abstract

The invention discloses a method for treating waste water with organic modified bentonite. The method provided in the invention comprises the following steps: (1) molding organic modified bentonite through immobilization; (2) filling molded organic modified bentonite in an adsorption apparatus; (3) delivering waste water into the adsorption apparatus filled with organic modified bentonite at a certain flow velocity so as to allow the waste water and organic modified bentonite to fully contact for infiltration and adsorption, wherein, outflow liquid after above-mentioned treatment is purified waste water; (4) desorbing organic modified bentonite with a desorption solution after saturation adsorption is achieved and allowing organic modified bentonite to be regenerated and recycled. According to the invention, organic modified bentonite is molded through immobilization, and the flow velocity of inflowing waste water is controlled; therefore, the problem of solid-liquid separation of waste water and an adsorbent is overcome, effective penetration and diffusion of bentonite in waste water is achieved, and the goal that liquid pollutants reach the standard after treatment is realized.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a method for treating wastewater with organically modified bentonite. Background technique [0002] Bentonite is a layered aluminosilicate mineral with montmorillonite as the main mineral. During the formation of clay minerals, similar isomorphic substitutions often occur, so there are excess negative charges between the layers of the crystal structure, which can electrostatically adsorb cations. Maintain electrical neutrality and have cation exchange properties. In addition, bentonite is a natural nanomaterial with a large surface area, which endows it with a huge surface energy, which makes it have a huge adsorption energy. Due to its good physical and chemical properties, bentonite is widely used in oil exploration, directional crossing, steel casting, metallurgical pellets, chemical coatings, compound fertilizers, sizing, rubber, plastics, papermakin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28
Inventor 黄怀国马龙胡杰华朱娜王弘朱菀烨郭金溢熊明叶志勇
Owner 厦门紫金矿冶技术有限公司
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