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Covalent bond type silicon-titanium flocculant as well as preparation method and application thereof

A covalent bond and flocculant technology, applied in chemical instruments and methods, flocculation/sedimentation water/sewage treatment, water pollutants, etc., can solve the problems of being easily affected by temperature and water quality fluctuations, low removal rates of nitrogen, phosphorus and DOC, Problems such as large amount of use, to achieve the effect of good product reproducibility, good effect and simple operation

Active Publication Date: 2021-07-16
SHANXI UNIV
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  • Claims
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Problems solved by technology

At present, metal coagulants commonly used in water treatment processes are mainly divided into two categories: aluminum-based coagulants and iron-based coagulants. In the coagulation treatment of urban sewage, there are large amounts of use and low removal rates of nitrogen, phosphorus and DOC. High, not obvious synergistic effect, susceptible to temperature and water quality fluctuations and other shortcomings, the effect is not satisfactory

Method used

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  • Covalent bond type silicon-titanium flocculant as well as preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

preparation Embodiment 1

[0026] According to the Si / Ti molar ratio of 0.05, take 100.0 mL of Ti(SO 4 ) 2 Solution, 0.00125mol trimethyl([3-(triethoxysilyl)propyl]ammonium chloride), 12.5mL deionized water were put into a three-necked flask, stirred and mixed evenly at room temperature. Then, stir at 500r / min for 4h at room temperature, and slowly add 12.5mL of NaHCO with a concentration of 1mol / L dropwise. 3 Solution to alkalization degree B is 0.5. The obtained solution was allowed to stand and mature for 48 hours until the reaction was complete, and a flocculant with a total titanium concentration of 0.2 mol / L was obtained.

preparation Embodiment 2

[0028] According to the Si / Ti molar ratio of 0.1, take 25.0 mL of TiCl with a concentration of 1.0 mol / L 4 Solution, 0.0025mol γ-aminopropyltriethoxysilane, and 75.0mL deionized water were put into a three-necked flask, and stirred and mixed evenly at room temperature. Then stir rapidly at room temperature, and slowly add 25.0 mL of NaOH solution with a concentration of 0.5 mol / L dropwise until the degree of alkalinity B is 0.5. The obtained solution was allowed to stand and mature for 24 hours, and after the reaction was complete, a flocculant with a total titanium concentration of 0.2 mol / L was obtained.

preparation Embodiment 3

[0030] According to Si / Ti molar ratio is 0.2, take 50.0mL Ti(SO 4 ) 2 Solution, 0.005mol trimethyl([3-(triethoxysilyl)propyl]ammonium chloride), 75.0mL deionized water were put into a three-necked flask, stirred and mixed evenly at room temperature, and the obtained solution was allowed to stand and mature for 24 hours. After the reaction is complete, a flocculant with a degree of alkalinity B of 0 and a total titanium concentration of 0.2 mol / L is obtained.

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Abstract

The invention relates to a covalent bond type silicon-titanium flocculant as well as a preparation method and application thereof. According to the hybrid flocculant, a silane coupling agent Y-R-Si-(R ') n (OR' ') (3-n), a titanium salt solution and a solvent are mixed, high-speed stirring is performed at the room temperature, an alkali solution is slowly dropwise added into the mixed solution for copolymerization, then room-temperature curing is performed, a colorless transparent product is obtained, R, R' and R ''are alkyl with the carbon number being 1-20, and Y is a functional group. The method has the advantages that the operation method is simple, the product generation reproducibility is good, the coagulating sedimentation rate is high, the adding amount is small, the flocculating performance on natural organic pollutants, NO3-N and TP in simulated wastewater containing humic acid nitrogen and phosphorus and urban sewage is excellent, the nitrogen and phosphorus content of effluent is reduced, and the good application and popularization value is achieved.

Description

technical field [0001] The invention belongs to the technical field of flocculants for urban sewage treatment, and in particular relates to a covalent bond type silicon-titanium flocculant, its preparation method and application. Background technique [0002] With the improvement of people's living standards, water quality health has received more and more attention. Some pollutants in urban sewage, such as nitrogen, phosphorus, and natural organic pollutants, cannot be completely removed during sewage treatment. Nitrogenous pollutants are mainly NH 4 + , NO 3 Exist in the form of -, phosphorus pollutants mainly in the form of PO 4 3 Exist in the form of -, these pollutants will cause eutrophication of the water body after being discharged into the water body, causing water pollution. [0003] The flocculation and sedimentation method is widely used in the pretreatment and advanced treatment of urban sewage because of its simple process, convenient operation, and cost-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52C02F1/54C02F101/10C02F101/16C02F101/30C02F101/34
CPCC02F1/545C02F1/5236C02F2101/105C02F2101/16C02F2101/30C02F2101/34
Inventor 杜志平巩祖鹏赵华章李剑锋
Owner SHANXI UNIV
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