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Method for preparing and using polymeric flocculant polyferric silicate sulfate

A polysilicate ferric sulfate and polymer flocculant technology, applied in the field of environmental engineering, can solve the problems of reducing product performance and increasing costs, and achieve the effects of low cost, simple production equipment, and excellent water purification effect

Active Publication Date: 2011-02-16
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Throughout the existing methods of preparing polyferric sulfate or ferric sulfate from ferrous sulfate, all of them are chemical oxidation methods. Whether it is direct oxidation or catalytic oxidation, an oxidizing agent with relatively strong oxidizing property must be used, and there are Side reactions not only reduce the performance of the product, but also increase the cost, especially in the process of catalytic oxidation, the catalyst is used, and the toxicity of the catalyst is worthy of attention. Therefore, it is necessary to develop new, low-energy, low-cost, and low-pollution oxidation technologies

Method used

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  • Method for preparing and using polymeric flocculant polyferric silicate sulfate
  • Method for preparing and using polymeric flocculant polyferric silicate sulfate
  • Method for preparing and using polymeric flocculant polyferric silicate sulfate

Examples

Experimental program
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Effect test

Embodiment 1

[0041] Take 400ml of raw water kaolin suspension, the turbidity is 114NTU, pH=7.2, stir at a constant speed of 40-60r / min for 10min, let it settle for 30min, take the supernatant at 2-3cm below the liquid surface to measure the residual turbidity , the results are as follows:

[0042]

[0043] Conclusion: The turbidity removal rate is above 92%.

Embodiment 2

[0045] The bioactive dye methylene blue (C 16 h 18 ClN 3 S·3H 2 0) be mixed with the water sample of 50mg / L, adopt ultraviolet spectrophotometer to record the maximum absorption wavelength of methylene blue dye solution at 665nm place, record the absorbance Ao=0.157 of raw water with spectrophotometry.

[0046] Take 400mL of the above-mentioned dye wastewater, adjust the pH value to 8.0, add the flocculant PFSS to 6mL, stir at a constant speed of 40-60r / min for 10min, let it settle for 30min, and place it at 2-3cm below the liquid surface Take the supernatant and measure the absorbance A=0.002.

[0047] Conclusion: The decolorization rate is above 98.7%.

Embodiment 3

[0049] Take the water from a university landscape lake. The appearance of the water body is light green, the water temperature is 20.0-25.0°C, pH=6.72, COD=330.4mg / L.

[0050] Take 400mL of the above-mentioned landscape lake water, adjust the pH value to 8.0, add the flocculant PFSS to 5mL, stir at a constant speed of 40-60r / min for 10min, let it settle for 30min, and place it at a place 2-3cm below the liquid surface Take the supernatant and measure the COD of 50 mg / L by rapid digestion spectrophotometry.

[0051] Conclusion: COD removal rate is above 85%.

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Abstract

The invention discloses a method for preparing inorganic polymeric flocculant polyferric silicate sulfate and a wastewater treatment method. Ferrous sulfate is oxidized into polyferric sulfate through the acclimated thiobacillus ferrooxidans; polymerization reaction is conducted between the polyferric sulfate and the active polysilicic acid solution; and then the polymerization reaction product is left to stand and ageing to obtain the brownish red liquid polyferric silicate sulfate. The product brownish red liquid polyferric silicate sulfate is applicable to the purification of domestic sewage, printing and dyeing wastewater and heavy metal wastewater and COD removal rate, decoloring rate and heavy metal removal rate can reach more than 90%.

Description

technical field [0001] The invention belongs to the field of environmental engineering, and in particular relates to a preparation method of a polymer flocculant polysilicate ferric sulfate and its application in wastewater treatment. Background technique [0002] Flocculants play an important role in water treatment. High-efficiency and low-cost flocculants are the key to the realization of chemical flocculation-enhanced primary treatment technology, and high-efficiency and low-cost flocculants have been included in my country's "Tenth Five-Year Plan" water treatment agent development plan. It can be used to reduce sensory indicators such as turbidity and chromaticity of water, and remove various high molecular organic substances, certain heavy metals and radioactive substances. According to chemical properties, flocculants can be divided into inorganic flocculants and organic flocculants. According to the molecular weight, it can be divided into polymer flocculant and tr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P3/00C02F1/52C12R1/01C12P1/04
Inventor 闵小波柴立元王慧敏舒余德蒋国民杨志辉王海鹰杨卫春
Owner CENT SOUTH UNIV
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