Method for disposing waste water by using enhanced polyhydroxy ferrous compound

A polyhydroxy ferrous and waste water treatment technology, applied in the direction of reductive water/sewage treatment, etc., can solve the problems of complex process and slow speed, and achieve the effect of less dosage, convenient operation and flexible dosing method.

Active Publication Date: 2013-08-14
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

In addition, printing and dyeing wastewater is generally alkaline and requires a large amount of sulfuric acid. After the reaction, alkali needs to be added to adjust the pH back to neutral, and auxiliary materials such as activated carbon and carbon black need to be added. The process is complicated.
The pure ferrous hydroxyl compound prepared by the Chinese patent "Preparation of polyhydric structure state ferrous compound and its use in waste water reduction pretreatment" (CN102060334A) has strong reducing performance, can reduce and decolorize dyes, and can be used in printing and dyeing wastewater Reduction pretreatment, but experimental studies have shown that the rate of polyhydric ferrous reduction of halogenated aromatic compounds is very slow, and it is almost impossible to dehalogenate it, thus limiting its application

Method used

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  • Method for disposing waste water by using enhanced polyhydroxy ferrous compound

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Preparation of Cu / FHC: use 0.75×10 -4 mol / L ascorbic acid solution, add the cetyltrimethylammonium bromide anaerobic aqueous solution 1ml of 3% mass concentration, then add the NaOH of 5mol / L dropwise to this solution, make [Fe (II)]: [OH -]=0.5, stir and mix evenly, add 0.8mol / L CuSO while stirring 4 , so that the mixed solution contains copper ions and iron ions with a molar ratio of Cu / Fe=0.14. The preparation method of ordinary FHC is to use anaerobic distilled water to configure 1mol / L FeSO 4 aqueous solution, and then add 5 mol / L NaOH dropwise to the solution to make [Fe(II)]:[OH-]=0.5, stir and mix evenly to form precipitate FHC. .

[0032] Take 250mL of 2,5-dibromoaniline stock solution with a concentration of 50mg / L and add it to a 250mL Erlenmeyer flask with a stopper, add 1.6g / L of Cu / FHC and FHC respectively, stir, and regularly take samples to analyze 2,5- Dibromoaniline reduction product.

[0033] Table 1 shows that when only FHC is added, the removal...

Embodiment 2

[0037] Preparation and use of Cu / FHC: get six parts of 250mL concentration and add 2,5-dibromoaniline stock solution of 50mg / L into the 250mL Erlenmeyer flask with stopper respectively, add 1g / L of FHC (according to Example 1) Cu / FHC preparation method by preparing ascorbic acid solution and adding dispersant, but without adding Cu 2+ ), add a certain amount of 1mol / L CuCl to the bottle while stirring 2 Make the molar ratio of Cu / Fe up to 3.5×10 -3 ~0.3, after 60 hours of reaction, samples were taken to analyze the reduction products of 2,5-dibromoaniline. Table 2 shows that with the increase of Cu(II) dosage, the removal rate of 2,5-dibromoaniline and the bromide ion concentration gradually increase.

[0038] Table 2 Differences in the removal of 2,5-dibromoaniline under different Cu(II) dosage conditions

[0039] Molar ratio of Cu / Fe

Embodiment 3

[0041] Six parts of 250mL concentration is the 2,5-dibromoaniline stock solution of 50mg / L to adjust pH=13, add the ferrous sulfate of 0,0.5,1,1.6,3.2,5g / L respectively (in the iron content in the solution, hereinafter the same), and add 0.5ml of cetyltrimethylammonium bromide anaerobic aqueous solution of 3% mass concentration, add a certain amount of 0.1mol / L Cu(NO 3 ) 2 Make Cu / Fe=0.03, and take a sample to analyze the reduction product of 2,5-dibromoaniline after 60 hours of reaction. Table 3 shows that when the dosage of FHC is greater than or equal to 1.6g / L, the promotion effect of FHC on the reduction of pollutants is weak.

[0042] Table 3 Effects of different FCH dosages on the removal of 2,5-dibromoaniline

[0043] Ferrous sulfate dosage (g / L)

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Abstract

The invention relates to a method for polyhydroxy ferrous compound by using an enhanced polyhydroxy ferrous compound. The method comprises the steps of: dissolving ferrite into a dilute ascorbic acid solution, disposing by utilizing a dispersing agent, an alkaline solution and copper salt to obtain the enhanced polyhydroxy ferrous compound, disposing the waste water by utilizing the compound, and sampling and analyzing. Compared with the prior art, the enhanced polyhydroxy ferrous compound is high in reducing activity, good in dispersity and large in specific surface area and can be used for reducing and converting degradation-resistant toxic pollutants in the waste water, the biodegradability of the waste water can be improved, in addition, the cost is lower, the usage amount is less, and the disposal cost is lower.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a method for strengthening polyhydroxy ferrous compounds to treat wastewater. Background technique [0002] According to the standard electrode potential E θ (Fe 3+ / Fe 2+ )=0.771V, we can know Fe 2+ Has a certain reducing effect, Fe 2+ High-valent ions of transition metals such as Cr(VI) and Mn(IV) can be reduced, but the performance of reducing complex organic compounds such as nitrobenzenes and halogenated aromatic compounds is poor. The combination of ferrous iron and hydroxide radicals can significantly improve the reduction of ferrous radicals. The Chinese patent "A Preparation Method for Lvxiu" (CN 101259970A) discloses a co-precipitation of Fe(II) and Fe(III) with hydroxide radicals The method of forming Lvxiu; Lvxiu is a mixture containing Fe(II) and Fe(III) with LDH (Layered doubled hydroxide, LDH) structure, which is generally an inter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/70
Inventor 吴德礼冯勇马鲁铭王权民
Owner TONGJI UNIV
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