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Preparation method of organic high-polymer flocculant, and preparation method and application of inorganic-organic high-polymer composite coagulant

An organic polymer and flocculant technology, applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of inorganic iron salt coagulant molecular weight, particle size, poor coagulation and bridging ability, etc., to achieve wide application range, settlement Good performance and simple operation

Inactive Publication Date: 2015-07-08
DONGGUAN UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the molecular weight, particle size and coagulation bridging ability of inorganic iron salt coagulants are still much worse than those of organic coagulants.

Method used

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  • Preparation method of organic high-polymer flocculant, and preparation method and application of inorganic-organic high-polymer composite coagulant
  • Preparation method of organic high-polymer flocculant, and preparation method and application of inorganic-organic high-polymer composite coagulant
  • Preparation method of organic high-polymer flocculant, and preparation method and application of inorganic-organic high-polymer composite coagulant

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preparation example Construction

[0029] A preparation method of an inorganic-organic polymer composite coagulant, comprising the steps of:

[0030] 1) In the presence of an initiator and a chelating agent, the dimethyldiallylammonium chloride monomer is polymerized in the form of aqueous solution polymerization to obtain a colloidal solution of polydimethyldiallylammonium chloride ;

[0031] 2) heating and mixing the polyferric sulfate solution and the colloidal solution obtained in the previous step to obtain a colloidal mixed solution;

[0032] 3) Keep warm and disperse until the mixture forms a homogeneous system.

[0033] Preferably, in step 1), the polymerization is carried out in two stages: the first stage: heating to 45~65°C under stirring conditions, and reacting for 2~4 hours; the second stage stops stirring, and after raising the temperature to 55~70°C, keep warm Time 1~2h.

[0034] Preferably, in step 1), the mass ratio of the initiator to the chelating agent is (20-70):1.

[0035] Preferably,...

Embodiment 1

[0047] (1) Ammonium persulfate is used as the initiator to polymerize dimethyldiallyl ammonium chloride monomer in aqueous solution polymerization, which is carried out in two stages. In the first stage, dimethyldiallyl ammonium chloride with a mass concentration of 60% is adjusted The pH value of ammonium chloride monomer solution is 6, add initiator ammonium persulfate and metal chelating agent EDTA-4Na, heat and stir to 55°C, and continue stirring for 4h, the mass ratio of initiator ammonium persulfate and metal chelating agent EDTA-4Na 70:1, stop stirring in the second stage, heat up to 65°C, keep warm for 2 hours, prepare monomer conversion rate of 85%, intrinsic viscosity of 1.8dL / g organic polymer flocculant polydimethyldiallylammonium chloride colloidal solution.

[0048] (2) Heat the polyferric sulfate solution of 11% based on the mass fraction of total iron to 50~60°C under stirring conditions, add the colloidal solution obtained in step (1) to obtain a mixed solutio...

Embodiment 2

[0052] (1) Ammonium persulfate is used as the initiator to polymerize dimethyldiallyl ammonium chloride monomer in aqueous solution polymerization, which is carried out in two stages. In the first stage, dimethyldiallyl ammonium chloride with a mass concentration of 60% is adjusted The pH value of ammonium chloride monomer solution is 6, add initiator ammonium persulfate and metal chelating agent EDTA-4Na, heat and stir to 55°C, and continue stirring for 4h, the mass ratio of initiator ammonium persulfate and metal chelating agent EDTA-4Na 70:1, stop stirring in the second stage, heat up to 60°C, keep warm for 1h, prepare monomer conversion rate of 80%, intrinsic viscosity of 1.4dL / g organic polymer flocculant polydimethyldiallylammonium chloride colloidal solution.

[0053] (2) Heat the polyferric sulfate solution of 11% based on the mass fraction of total iron to 50~60°C under stirring conditions, add the colloidal solution obtained in step (1) to obtain a mixed solution of ...

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Abstract

The invention discloses a preparation method of an organic high-polymer flocculant, and a preparation method and application of an inorganic-organic high-polymer composite coagulant. The preparation method of the organic high-polymer flocculant comprises the following step: in the presence of an initiator and a chelator, carrying out solution polymerization on dimethyl diallyl ammonium chloride monomer to obtain a polydimethyl diallyl ammonium chloride colloidal solution which is the organic high-polymer flocculant. The preparation method of the composite coagulant comprises the following steps: 1) heating and mixing a polyferric sulfate solution with the colloidal solution to obtain a colloid mixed solution; and 2) keeping the temperature, and dispersing until the mixed solution forms a homogeneous system. The invention also discloses application of at least one of the prepared flocculant and inorganic-organic high-polymer composite coagulant in coagulative purification or sludge dewatering treatment of polluted water bodies. The technique is simple, and the prepared composite flocculant has favorable effect. The flocculant and coagulant can be used for micropolluted water source-water coagulative purification, special wastewater treatment, sludge dewatering and the like, and are simple and quick to operate.

Description

technical field [0001] The invention relates to a preparation method of an organic polymer flocculant, a preparation method and application of an inorganic-organic polymer composite coagulant. Background technique [0002] At present, more than 90% of China's urban waters are polluted to varying degrees, and the water quality of 50% of key urban water sources does not meet the standards of drinking water sources. Many pollutants have been detected, some of which are priority detection substances stipulated by the EPA. The human body has carcinogenic, mutagenic, teratogenic and other hazards, and the phenomenon of micro-pollution is becoming more and more serious. my country's drinking water is facing severe challenges. On the one hand, the pollution of drinking water sources is serious, and the degree of pollution may further deteriorate for a long time; on the other hand, drinking water quality standards are becoming increasingly stringent. Conventional drinking water treat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/56C02F1/52
Inventor 钟少芬李阳苹纪传伟刘治猛蔡卓弟
Owner DONGGUAN UNIV OF TECH
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