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Attapulgite adsorbent for treating COD in wastewater and preparing method

A technology for treating wastewater and attapulgite, which is applied in water treatment parameter control, water/sewage treatment, chemical instruments and methods, etc., can solve the problem of low absorption efficiency, achieve good effect, increase pore volume and specific surface area, and have remarkable effect Effect

Inactive Publication Date: 2017-07-07
MINGGUANG GUOXING ATTAPULGITE CLAY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In view of the defects in the prior art, the purpose of the present invention is to provide an attapulgite adsorbent for treating COD in wastewater and a preparation method thereof. The purpose of the present invention is to use activated carbon for adsorption when the existing filtration adsorption method is used to treat high-concentration COD. Due to the low absorption efficiency of the solvent, the attapulgite is modified and combined with alumina to prepare an adsorbent to achieve an efficient treatment of COD

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The attapulgite adsorbent for treating COD in wastewater described in this embodiment includes the following components in parts by weight: 85 parts of modified attapulgite, 15 parts of alumina, and 10 parts of crosslinking agent. Adding a cross-linking agent can make the layer chain structure cross-linked into a network structure, thereby increasing its specific surface area and cohesiveness, and improving adsorption performance; alumina has adsorption performance.

[0030] The preparation method of the attapulgite adsorbent for treating COD in wastewater described in this embodiment comprises the following steps:

[0031] (1) Preparation of modified attapulgite: use attapulgite as raw material, conduct heat treatment to activate it, the heat treatment temperature is 180°C, and the treatment time is 7h; then carry out acid treatment with a concentration of 10-20mol / L of hydrochloric acid solution, soaking time is 6h; after drying, carry out chromic acid oxidation solu...

Embodiment 2

[0038] The attapulgite adsorbent for treating COD in wastewater described in this embodiment includes the following components in parts by weight: 70 parts of modified attapulgite, 20 parts of alumina, and 5 parts of crosslinking agent. Adding a cross-linking agent can make the layer chain structure cross-linked into a network structure, thereby increasing its specific surface area and cohesiveness, and improving adsorption performance; alumina has adsorption performance.

[0039] The preparation method of the attapulgite adsorbent for treating COD in wastewater described in this embodiment comprises the following steps:

[0040] (1) Preparation of modified attapulgite: using attapulgite as raw material, conduct heat treatment to activate it, the heat treatment temperature is 220°C, and the treatment time is 5h; then acid treatment is performed with a concentration of 10-20mol / L of hydrochloric acid solution, soaking time is 3h; after drying, carry out chromic acid oxidation ...

Embodiment 3

[0047] The attapulgite adsorbent for treating COD in wastewater described in this example includes the following components in parts by weight: 80 parts of modified attapulgite, 17 parts of alumina, and 8 parts of crosslinking agent.

[0048] The preparation method of the attapulgite adsorbent for treating COD in wastewater described in this embodiment comprises the following steps:

[0049] (1) Preparation of modified attapulgite: use attapulgite as raw material, conduct heat treatment to activate it, the heat treatment temperature is 200°C, and the treatment time is 6h; then carry out acid treatment with a concentration of 10-20mol / L of hydrochloric acid solution, soaking time is 5h; after drying, carry out chromic acid oxidation solution treatment, soak in the chromic acid oxidation solution at room temperature for 0.7h, soak at 35°C for 7min, and treat at 65°C for 1min; finally Calcination treatment, the treatment temperature is 500°C, to obtain the modified attapulgite; ...

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Abstract

The invention belongs to the technical field of an attapulgite adsorbent for treating COD in wastewater and a preparing method. The attapulgite adsorbent for treating the COD in the wastewater is prepared from, by weight, 70-85 parts of modified attapulgite, 15-20 parts of aluminum oxide and 5-10 parts of cross-linking agent. The attapulgite adsorbent for treating the COD in the wastewater is prepared by modifying attapulgite, adding the cross-linking agent and aluminum oxide and conducting heat treatment. The attapulgite adsorbent for treating the COD in the wastewater is simple in technology, low in cost and remarkable in COD treatment effect, the removal rate is up to 85% or above, and the discharge concentration after treatment is lower than a state-specified first grade discharge standard.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to an attapulgite adsorbent for treating COD in waste water and a preparation method thereof. Background technique [0002] A large amount of waste liquid and waste water of dry film, wet film and ink will be produced in the process of film backing, developing and screen printing in the manufacture of printed boards. It contains a large amount of polymers, organic amines and alkalis. It is a kind of High-concentration organic wastewater, the wastewater is blue, and its chemical oxygen demand (COD) value is usually 5000-10000mg / L, and some are as high as 20000mg / L. This type of wastewater accounts for about 5% of the total water volume of printed board wastewater . However, the COD contribution to the total wastewater is as high as 80%. According to the national wastewater discharge standard, the COD value in wastewater must be <100mg / L. Therefore, the qual...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/12B01J20/28B01J20/30C02F1/28C02F101/30
CPCB01J20/12B01J20/08B01J20/28057B01J20/28069C02F1/288C02F2101/30C02F2209/08
Inventor 李振国
Owner MINGGUANG GUOXING ATTAPULGITE CLAY
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