Finishing agent for modified bentonite and zero-valent molten iron

A bentonite and treatment agent technology, applied in the field of wastewater treatment, can solve the problems of reducing the adsorption performance of iron surface to pollutants, reducing the reactivity and service life of iron, and increasing the pH of the solution, achieving high cost performance, high removal rate, and adsorption capacity strong effect

Inactive Publication Date: 2008-11-19
SHAOXING UNIVERSITY +2
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

However, the treatment of zero-valent iron in the actual wastewater system still has the following major problems: 1. The removal efficiency of some pollutants by zero-valent iron is not high; The reaction of the protons in the solution will cause the pH

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

Example 1

Use crystalline aluminum chloride (AlCl3·6H2O) to make 0.2mol / L AlCl3 solution, place it in a 70℃ water bath, keep stirring, and drop 0.2mol / L NaOH solution into it at a rate of about 1mL / min until [OH-] / [Al3+] is 2.2, aging at room temperature for 2 days to obtain aluminum hydroxy pillaring solution. Take the bentonite into a 2% aqueous suspension, and slowly drop the pillaring solution into it at a ratio of [Al] / bentonite = 10mmol / g soil under constant stirring, and then age it in an oven at 70°C for 2 days. After centrifugal separation, the solid was washed with distilled water for more than 4 times until there was no residual Cl-, and dried to constant weight to obtain hydroxy aluminum pillared bentonite.

Example Embodiment

Example 2

10g of hydroxyaluminum pillared bentonite prepared in Example 1, 10g of commercial iron powder and 80g of ordinary yellow sand were mixed uniformly, and added to the flow exchange column, the pH=5 containing hexavalent chromium ion (concentration of 50ppm) wastewater from the bottom And the upper flow slowly through the exchange column, sampling and analyzing the residual amount of hexavalent chromium ion after the column, the removal amount is calculated from the difference between the initial amount of hexavalent chromium ion and the residual amount, the removal rate is the removal amount of the initial amount percentage. The results are shown in Table 1. The determination of hexavalent chromium ion adopts diphenylcarbazide spectrophotometry.

Example Embodiment

Example 3

According to the experimental method of Example 2, the pH of the aqueous solution containing hexavalent chromium ions was adjusted to pH=9, and the other steps and methods were the same. The removal rate results are shown in Table 1.

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PUM

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Abstract

The invention discloses a modified bentonite and zero-valence iron water treatment agent which adopts an effluent treatment technology of blending the modified bentonite and the zero-valence molten iron, wherein the blending ratio of the modified bentonite to the zero-valence molten iron is the weight ratio of the modified bentonite to the zero-valence molten iron between 10:1 and 1:5. The effluent treatment technology has the characteristics of high efficiency in pollutant removal, a long zero-valence iron service life and a wide range PH value of the applicable medium and can be used to treat various effluent and sewage containing inorganic and organic pollutants.

Description

Modified bentonite and zero-valent iron water treatment agent technical field The invention relates to a water treatment agent, in particular to a water treatment agent for removing inorganic and organic pollutants by using modified bentonite and zero-valent iron, and belongs to the technical field of wastewater treatment. Background technique At present, the ubiquitous and difficult-to-degrade pollutants in soil and groundwater are mainly some inorganic and organic pollutants such as nitro compounds, chlorinated hydrocarbons, polycyclic aromatic hydrocarbons and heavy metal ions such as hexavalent chromium and pentavalent arsenic. Economical and effective removal of these pollutants has always been a hot issue in the field of environmental protection. Existing studies have shown that zero-valent iron has good reduction and degradation effects on various pollutants such as chlorinated hydrocarbons, polycyclic aromatic hydrocarbons, and nitro compounds, and has good reducti...

Claims

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Application Information

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IPC IPC(8): C02F1/70C02F1/28
Inventor 李益民李建法
Owner SHAOXING UNIVERSITY
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