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Preparation of ferrous compound in polyhydroxy structural state and application of ferrous compound in wastewater reduction pretreatment

A structural state, multi-hydroxyl technology, applied in the direction of iron compounds, reduced water/sewage treatment, water/sewage multi-stage treatment, etc., can solve the problem of insufficient green embroidery reduction ability, achieve high reduction activity, improvement of reduction performance, investment more convenient effect

Active Publication Date: 2011-05-18
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to improve the reduction performance of ferrous iron and apply it to the reduction pretreatment of industrial wastewater, a new method of wastewater reduction pretreatment is formed. The purpose of the present invention is to disclose a reduction performance Simple preparation method of pure ferrous hydroxy complex with strong structure, and used for waste water reduction treatment

Method used

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  • Preparation of ferrous compound in polyhydroxy structural state and application of ferrous compound in wastewater reduction pretreatment
  • Preparation of ferrous compound in polyhydroxy structural state and application of ferrous compound in wastewater reduction pretreatment
  • Preparation of ferrous compound in polyhydroxy structural state and application of ferrous compound in wastewater reduction pretreatment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Preparation of FHC: Weigh 2.78g of FeSO 4 ·7H 2 O dissolved in 50mL of deionized water to remove dissolved oxygen, then Fe in water 2+ Concentration is 0.2mol / L, and the NaOH of the 8mol / L of 2.15mL is added dropwise to this solution then, make [Fe(II)]:[OH - ]=0.58, stirred and mixed evenly, the pH value of the mixed solution was around 8.0, and an obvious dark green precipitate was seen to be formed.

[0036] Reduction treatment of pollutants: Take two 250mL reactive black 5 (reactive black 5, RB5) dye simulated wastewater to remove dissolved oxygen and add it to a 500mL beaker. Add 112mg / L (in terms of Fe(II) content) of FeSO in a part of dye wastewater 4 ·7H 2 O, ferrous iron in dissolved Fe 2+ exist. Add the FHC of 112mg / L (in terms of Fe(II) content) to another part of waste water, ferrous iron exists in the form of ferrous hydroxyl in the system at this moment, open stirring reactor, take a sample at set time point, detect Concentration of RB5 in treated w...

Embodiment 2

[0038] Take four 250mL portions of reactive brilliant red X-3B simulated wastewater that removes dissolved oxygen and add them to a 500mL beaker, adjust the initial pH of the dye solution to 4, 6, 8, and 10, and add 67.2mg / L (based on Fe(II) content) FHC (prepared according to the method in Example 1), open the six-connected agitator, take a sample at the set time point, detect the concentration of reactive brilliant red X-3B in the waste water after treatment and the pH after the reaction. It can be seen from Table 1 that the suitable pH range for FHC treatment of reactive brilliant red X-3B simulated wastewater is wide, and it has a good dye reduction and removal effect under the condition of pH value 4-10.

[0039] Table 1 The effect of different initial pH of the solution on the reduction activity of FHC Brilliant Red X-3B

[0040]

[0041]

Embodiment 3

[0043] different [Fe] / [OH - ] Preparation of FHC with molar ratio: Add 25 mL of 0.2 mol / L ferrous sulfate aqueous solution to five 100 mL beakers respectively, then add 5 mol / L NaOH solution 1 mL, 1.33 mL, 2 mL, 4 mL, 10 mL respectively, slowly Stir to form dark green precipitate FHC, then the [Fe] / [OH of FHC - ] The molar ratio is 1,0.75,0.5,0.25,0.10 respectively. Reduction treatment of dye wastewater: take five 200ml beakers, marked as A, B, C, D, E, and add 100ml of reactive black 5 (RB5) dye simulated wastewater of 100mg / L respectively, and adjust the initial pH of simulated wastewater to 8.0 , and then add [Fe] / [OH - ] molar ratio of 1,0.75,0.5,0.25,0.10 FHC 112mg / L (in terms of ferrous content), open the six-way stirrer and stir at a slow speed, react for 30min, take 10mL water sample and filter it through a 0.45μm filter membrane The results are shown in Table 2.

[0044] Reduction removal effect of table 2 reactive black 5 dyes

[0045] water sample

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Abstract

The invention relates to preparation of a ferrous compound in a polyhydroxy structural state and an application of the ferrous compound in wastewater reduction pretreatment. The preparation method comprises the following steps: dissolving a certain amount of ferrite in water without dissolved oxygen; and then gradually dropping oxygen-free alkaline solution in the obtained solution while stirringcontinuously, and generating structural state ferrous hydroxy complex (FHC) by controlling the molar ratio of ferrous ions to hydroxyls. The FHC prepared by the invention has high reduction activation and high reaction rate with pollutants and can fast reduce and convert harmful and poisonous pollutants in wastewater; and dissolved ferrous state is converted to structural ferrous state so as to obviously increase the reduction performance of the ferrous state. The FHC is used in the wastewater reduction pretreatment; and the scope of application of pH is wide, and the FHC has good effect whenthe pH value is 4-10. In addition, the FHC is more convenient to add compared with catalyzed iron filler; the wastewater treatment process is easy to operate, manage and maintain, and the cost is low; and the FHC is suitable for the large-scale reduction pretreatment of industrial wastewater.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and relates to a preparation method of a polyhydroxy structural state ferrous compound and its application in reduction pretreatment of industrial wastewater. Background technique [0002] The annual discharge of various types of industrial wastewater in my country reaches 25 billion tons. Industrial wastewater not only has a large discharge volume, but also has complex components, containing a large amount of refractory biodegradable substances and toxic pollutants. Its typical feature is BOD 5 The / COD value is very low, and it is difficult to biodegrade. Moreover, many industrial wastewaters are generally strongly acidic or alkaline, and have typical difficult-to-treat characteristics such as high concentration, high salinity, high chroma, and high toxicity. Therefore, the treatment of industrial wastewater has attracted great attention at home and abroad, and has become a wo...

Claims

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Application Information

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IPC IPC(8): C01G49/00C02F9/04C02F1/70
Inventor 吴德礼冯勇马鲁铭
Owner TONGJI UNIV
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