Dephosphorization flocculating agent and preparation method thereof

A composite flocculant and inorganic flocculant technology, applied in chemical instruments and methods, flocculation/sedimentation water/sewage treatment, water/sewage treatment, etc., can solve the problem of unsatisfactory dephosphorization effect, small floc structure and flocculation effect. General and other problems, to achieve good dephosphorization effect, low turbidity of effluent, and short settling time

Active Publication Date: 2015-01-07
内蒙古昕晟科贸有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the floc structure produced by pure iron salt is small, the net capture effect is poor, and the dephosphorization effect is not ideal.
Zeng Defang and others used lime, sodium fluoride and PAM to compound, the dephosphorization effect is better, but the flocculation effect is relatively general, and a large number of fluoride ions are used in the water quality, which poses a hidden danger to the water quality

Method used

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  • Dephosphorization flocculating agent and preparation method thereof
  • Dephosphorization flocculating agent and preparation method thereof
  • Dephosphorization flocculating agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The preparation of embodiment 1 QCS

[0036] Raw materials: Chitosan (CS, deacetylation degree 85%), Sinopharm Chemical Reagent Co., Ltd.;

[0037] 2,3-Epoxypropyltrimethylammonium chloride (GTA), Beijing Tongguang Fine Chemicals Co., Ltd.; Isopropanol, Shenyang Xinxing Reagent Factory.

[0038] The above reagents were analytically pure

[0039] Experimental procedure: Weigh 30g of GTA powder and place it in a beaker, add isopropanol and deionized water with a volume ratio of 1:1 as solvents (volumes are 200ml and 200ml respectively), dissolve evenly and pour into the container, weigh 40g of CS powder , put it into the container under electric stirring to make the reaction system mix evenly, stop the stirring after 6 hours of constant temperature reaction at 80°C, cool the obtained light yellow viscous product to room temperature, dry it in a vacuum drying oven until the product quality is constant, and then put it into the pulverized Crushed in the machine, sealed fo...

Embodiment 2

[0040] Embodiment 2 Preparation of carboxymethylated modified chitosan

[0041] Raw materials: Chitosan (CS, deacetylation degree 85%), Sinopharm Chemical Reagent Co., Ltd.;

[0042] Chloroacetic acid, Tianjin Jinke Fine Chemical Research Institute; sodium hydroxide, absolute ethanol, Shenyang Xinxing Reagent Factory.

[0043] The above reagents were all analytically pure.

[0044] Experimental procedure: Weigh 50g of sodium hydroxide solid and put it into 200ml of water, add 30g of chitosan and 8g of chloroacetic acid, stir to dissolve, shake well, stir and heat in a water bath at a temperature of 80-90°C for 5 hours, and keep the reaction system always formed. Weakly alkaline. After the reaction is complete, adjust the pH value of the solution to neutral, centrifuge, add three times the volume of ethanol to the filtrate, let it stand for precipitation, filter, and wash repeatedly with ethanol until the solid is light yellow or white. The solid obtained by filtering is dis...

Embodiment 3

[0046] Example 3 Preparation of Cationic Modified Polyacrylamide

[0047] Raw materials: methacryloyloxyethyltrimethylammonium chloride (76% DMC), self-made; acrylamide (AM), Tianjin Kemiou Chemical Reagent Development Center; potassium persulfate and sodium bisulfite, Sinopharm Group Chemical Reagent Co., Ltd.; Sodium Hydroxide, Hydrochloric Acid, Shenyang Xinxing Reagent Factory.

[0048] The above reagents were all analytically pure.

[0049] Experimental procedure: mix 45gDMC solution and 100gAM aqueous solution (concentration by weight is 15%) in proportion, at 50-60 degrees Celsius, adjust the pH value to 5-6, pass the gas for 15min, add the initiator dropwise, continue to pass the gas Nitrogen for 15 minutes. Seal the container and let it stand. Stop after 4 hours to obtain P(DMC-AM).

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Abstract

The invention discloses a dephosphorization flocculating agent and a preparation method thereof. The dephosphorization flocculating agent is formed by compounding an inorganic flocculating agent and an organic flocculating agent. The raw materials of the inorganic flocculating agent comprise sodium ferrate, borax, ferrous sulfate, silicate or aluminate; the raw materials of the organic flocculating agent comprise modified chitosan or modified polyacrylamide. The preparation process comprises the following steps: firstly adding a non-oxidizing acid into the silicate or aluminate to obtain a polysilicate colloid or an aluminum hydroxide colloid, then adding a borax solution and a sodium ferrate solution sequentially while stirring, further dropping a ferrous sulfate solution, mixing to form the inorganic flocculating agent, standing, then adding the modified polyacrylamide or modified chitosan into the inorganic flocculating agent, curing and adding the acid till the pH value is less than 7 to obtain the finished dephosphorization flocculating agent. The flocculating agent is suitable for a wide range of water quality, is little affected by co-existing salts, the pH value of sewage and temperature and is particularly effective for dye wastewater, oilfield sewage and the like.

Description

technical field [0001] The invention relates to a dephosphorization flocculant suitable for wastewater treatment and a preparation method thereof, in particular to an inorganic-organic composite flocculant and a preparation method thereof. The present invention also relates to the application of the above-mentioned flocculant in sewage treatment. Background technique [0002] In the treatment of industrial water, drinking water and domestic sewage, the performance of flocculants is very important. In the flocculation process of water treatment, the nano-scale, micron-scale suspension or colloidal impurity particles in the water are mainly formed by coagulation-flocculation reaction under the action of flocculant to form large floc particles, and finally by sedimentation, filtration and other processes Remove it. [0003] A lot of in-depth research has been done on the mechanism and process of flocculation, and it has gone through three main development stages: Before the 1...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52C02F1/56
CPCC02F1/5236C02F1/5245C02F1/5263C02F1/56C02F2001/5218
Inventor 杨曼君
Owner 内蒙古昕晟科贸有限责任公司
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