Preparation of iron-managanese compounded oxide/diatomite adsorbant, its using and regenerating method

A composite oxide, diatomite technology, applied in chemical instruments and methods, adsorption water/sewage treatment, other chemical processes, etc., can solve the problems of small arsenic adsorption capacity, high cost, and restricting the popularization and application of arsenic removal adsorption materials. , to achieve the effect of fast adsorption speed, low cost and excellent water purification performance

Active Publication Date: 2007-08-29
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, among the currently commonly used arsenic removal materials, low-cost materials usually have a small adsorption capacity for arsenic, while materials with higher adsorption capacity are often too expensive, which limits the popularization and application of arsenic removal adsorption materials.

Method used

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  • Preparation of iron-managanese compounded oxide/diatomite adsorbant, its using and regenerating method
  • Preparation of iron-managanese compounded oxide/diatomite adsorbant, its using and regenerating method
  • Preparation of iron-managanese compounded oxide/diatomite adsorbant, its using and regenerating method

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Experimental program
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Effect test

Embodiment 1

[0023] Embodiment 1 Preparation of iron-manganese composite oxide / diatomaceous earth adsorbent: weigh 1.248g FeSO 4 7H2O and 0.237g KMnO 4 , were dissolved in 60ml of water. Add 2.4ml 1mol / LNaOH solution in potassium permanganate solution, then add ferrous sulfate solution, stir 60g diatomite (BET 3m 2 / g, 65 mesh or more) was added to the mixture, continued to stir for 30 minutes, then stood still and aged at room temperature for 16 hours. After aging, skim off the supernatant, then add a small amount of dilute sodium hydroxide solution to neutralize to neutrality, then add 200ml deionized water, stir and wash for 10 minutes, filter for solid-liquid separation, and continue to add solid adsorbent Wash with deionized water for 3-4 times, separate the adsorbent, put it in an oven and bake it at 50-55°C for 2 hours, raise the temperature to 105°C and keep it for 8 hours to obtain the iron-manganese composite oxide / diatomite Adsorbent.

Embodiment 2

[0024] Example 2 Application of iron-manganese composite oxide / diatomite adsorbent in the treatment of arsenic-containing wastewater: the reactor used in the present invention is a glass packed column filled with prepared iron-manganese oxide / diatomite adsorbent Particles, the column height is about 0.5m, the diameter is 3.4cm, and the filling volume is 415cm 3 . A certain arsenic-containing wastewater, the concentration of trivalent arsenic As(III) is 1 mg / l, and the pH is 6.7. Water is fed from the bottom of the packed column, and water is discharged from the upper end, with a flow rate of 40ml / min, and the concentration of arsenic in the discharged water is regularly measured. After flowing through 170 times the filling volume, the concentration of arsenic in the effluent was higher than 10 μg / l.

Embodiment 3

[0025] Example 3 In-situ regeneration of iron manganese oxide / diatomite adsorbent: When the concentration of arsenic in the effluent water of the packed column is higher than the water quality requirement, stop the water inflow, and after emptying the water in the column, slowly pump the arsenic from the bottom of the packed column. 100ml 0.03mol / L KMnO with lye 4 solution, and then slowly add 100ml of 0.09mol / L ferrous sulfate solution from the top of the packed column at a flow rate of 1ml / min. After the addition is completed, it is statically aged for 4 hours, and then the water phase is released, and the packed column is washed with deionized water until the concentration of soluble iron and manganese ions in the effluent is lower than the water quality requirement.

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Abstract

The invention supplies a new type adsorbent--mixed oxide of iron and manganese / diatomite preparation, use and regeneration method, belongs to the treatment of technology. The method used the soluble ferrous permanganate and salt as raw materials, respectively prepared the solutions, after adequate lye into permanganate solution, mixed two salt solutions, by adding diatomite particles, full oscillation, standing aging, neutralize, washing and drying to get the manganese oxide / silicon algae absorbent. The adsorbent is larger than the surface area and good adsorption properties can be used to remove arsenic in water pollutants (especially tervalence arsenic), and the adsorption surface activity of the saturated absorption of pollutants can be directly passed to load manganese oxide compound to regeneration.

Description

technical field [0001] The invention relates to a method for preparing an iron-manganese composite oxide / diatomite adsorbent with high specific surface area and excellent adsorption performance for removing pollutants such as arsenic in water, a method for using the adsorbent in water treatment and Sorbent regeneration method. The invention belongs to the technical field of water treatment application. Background technique [0002] Adsorption is one of the most effective methods for removing arsenic contaminants from drinking water or sewage wastewater. This method is simple and easy to implement, and is usually suitable for water treatment systems with large treatment capacity and low concentration. This method uses an insoluble solid material with high specific surface area and excellent mechanical strength as an adsorbent, and adsorbs arsenic and other pollutants in water on the surface of the adsorbent through physical adsorption, chemical adsorption or ion exchange, s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/14C02F1/28
Inventor 曲久辉张高生刘会娟刘锐平雷鹏举
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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