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Nano ferric oxide-cationic polyelectrolyte coupled multielement composite flocculant

A technology of nano-iron oxide and cationic polymerization, which is applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of increasing treatment costs and metal ion concentration, and achieves a wide range of pH applications, low turbidity of effluent, and reduced production costs Effect

Inactive Publication Date: 2011-08-17
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

At present, the preparation of composite flocculants is made of iron salts, aluminum salts and polyaluminum salts combined with high-molecular organic matter to form flocculants to enhance the coagulation effect; or to improve the coagulation effect by increasing the dosage of coagulants. cost, and may also increase the concentration of metal ions in the effluent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Add 1000mL of raw water samples from the Jiantian Reservoir to a series of 250mL beakers, add 50mg / L, 100mg / L, 200mg / L, 300mg / L, 400mg / L, 600mg / L nano Fe 3 o 4 The flocculant is used for coagulation and stirring. After stirring for 1 minute, add 1mg / LPDADMAC. After coagulation and stirring, the supernatant after settling is left to stand, and passed through a 0.45μm filter membrane in a 50mL centrifuge tube. It is used for the removal of humic acid. The TOC instrument measures the total organic carbon content, and measures the changes of water turbidity and color before and after treatment. The results show that: the removal rate of humic acid: 49%; the removal rate of turbidity: 77%; the removal rate of color: 88 %.

Embodiment 2

[0017] In a 1000mL beaker, put the concentration of 50mg / L, 100mg / L, 200mg / L, 300mg / L, 400mg / L, 600mg / L nanometer α-FeOOH flocculant in a series of 1000mL beakers, the pre-adjusted The pH values ​​were 5, 6, 7, 8 respectively, and 1000mL of humic acid solution with an initial concentration of 10mg / L was added to the beaker for coagulation and stirring. After stirring for 1 minute, 5mL of 400mg / LPDADMAC solution was added. The coagulation temperature is 25°C. Take the solution supernatant after standing and settling, and filter it into a 50mL sample tube through a 0.45um filter membrane. The removal of humic acid is indicated by measuring its total organic carbon content with a TOC instrument, and measuring the water turbidity and chromaticity before and after treatment. Changes, the results show that: after adding cations, the results show that under different pH conditions, the removal rate of humic acid continues to increase, at 75%-95%; turbidity removal rate: 60%-90%; chro...

Embodiment 3

[0019] The composite flocculant samples of nano-α-FeOOH and PDADMAC were weighed at 5.0, 10.0, 15.0, 20.0, 30.0 and 50 mg / L respectively, the initial concentration of PFOS was 2 mg / L, and the pH value was 3.0. Shake at a constant temperature of 25 °C , take the supernatant, measure the concentration of PFOS, the results show that the removal rate: 70%-93%.

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Abstract

The invention provides a nano ferric oxide-cationic polyelectrolyte coupled multielement composite flocculant, relating to an inorganic-organic composite flocculant. The invention provides a novel high-efficiency composite flocculant compounded by nano ferric oxide and cationic polyelectrolyte, wherein the nano ferric oxide is nano alpha-FeOOH, Fe3O4, alpha-Fe2O3, gamma-Fe2O3 and the like, and the cationic polyelectrolyte is polyamine, polyacrylamide, poly (diallyldimethylammonium chloride), chitosan and the like. The composite flocculant provided by the invention is applicable to micro-pollution water source strengthening treatment, the treatment effect on toxic and harmful pollutants (heavy metals, toxic organic matters and the like), humic acid and chromaticity is higher, and the composite flocculant provided by the invention has the advantages of good separating effect, rapid sedimentation, low effluent turbidity, wide pH application range and the like.

Description

technical field [0001] The invention relates to an inorganic-organic composite flocculant, in particular to a composite flocculant with good removal effect for organic matters, turbidity and chroma in drinking water. Background technique [0002] In the face of changes in water quality and the improvement of water quality requirements, the conventional coagulation process can no longer meet the requirements. Experimental research and actual production results at home and abroad show that conventional coagulation, sedimentation and filtration can only remove 20% to 30% of organic matter in water, and due to the presence of dissolved organic matter, it is not conducive to destroying the stability of the colloid and the turbidity removal effect is significantly reduced. , Therefore, more and more attention is paid to the research on composite flocculants, as patent CN1821114A discloses a kind of preparation method of composite flocculants such as aluminum sulfate, slaked lime; ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/56
Inventor 田秉晖王秀辛丽花王国田贾大伟苏敏刘徽马玉涛
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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