A flocculant with excellent dehydration of floc sediment
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A sediment and dehydration technology, applied in the fields of flocculation/sedimentation water/sewage treatment, water pollutants, water/sewage treatment, etc. Large, excellent dehydration, fast effect
Active Publication Date: 2018-06-01
SHANDONG DESHI CHEM IND CO LTD
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Therefore, introducing silicon polymer into the flocculant to increase its microscopic pores can greatly reduce the water content of the sludge produced by flocculation and sedimentation. At present, such research reports are rare
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Embodiment 1
[0025] Preparation of mixed solution A: Take the reaction vessel, add 250 ml of isopropanol, add 20 g of chitosan (industrial grade, deacetylation degree ≥ 80%) while stirring, keep stirring and heat to 80 ° C in a water bath, then add 80 Gram of 3-chloro-2-hydroxypropyltrimethylammonium chloride was stirred at 80° C. for 4 hours to obtain a mixed solution A.
[0026]Preparation of mixed solution B: take another reaction container, add 250 ml of isopropanol, then add 13 ml of tetraethyl orthosilicate while stirring, then add 26 ml of water (tap water), and add hydrochloric acid dropwise while stirring to adjust the pH of the solution to 4. Continue stirring at room temperature for 1 hour to obtain mixed solution B.
[0027] Preparation of flocculant: take the third reaction vessel, add 250 ml of mixed solution A and mixed solution B into the reaction vessel, then add 38 ml of 3mol / L aluminum nitrate aqueous solution and 25 ml of 5mol / L aluminum nitrate solution while stirring ...
Embodiment 2
[0032] Preparation of mixed liquid A: Take the reaction vessel, add 250 ml of isopropanol, add 37 g of chitosan (industrial grade, degree of deacetylation ≥ 80%) while stirring, keep stirring and heat to 90 ° C in a water bath, then add 262 Gram of 3-chloro-2-hydroxypropyltrimethylammonium chloride was stirred at 90°C for 6 hours to obtain a mixed solution A.
[0033] Preparation of mixed solution B: Take another reaction container, add 250 ml of isopropanol, then add 37 ml of tetraethyl orthosilicate while stirring, then add 74 ml of water (tap water), and add hydrochloric acid dropwise while stirring to adjust the pH of the solution to 3. Continue stirring at room temperature for 2 hours to obtain mixed solution B.
[0034] Preparation of flocculant: take the third reaction vessel, respectively take 167 ml of mixed solution A and 250 ml of mixed solution B into the reaction vessel, then add 33 ml of 3.5 mol / L aluminum nitrate aqueous solution and 25 ml of 5.7 mol / L while sti...
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Abstract
The invention provides a flocculating agent with an excellent floc precipitate dehydrating property and a preparation method thereof which are applied to the sewage treatment industry, and belongs to the technical field of environment friendliness. According to the preparation method, a mixture which is in a network-shaped molecular structure is finally formed to serve as the flocculating agent by performing a substitution reaction and a polymerization reaction on chitosan, tetraethoxysilane, aluminium nitrate and iron oxide serving as raw materials; the preparation method has the characteristics that the floc formation speed is high, floc aggregates are large and cannot be re-dissolved, the formed sewage is easy to dehydrate and is easy to degrade; the removal rate of suspended solids reaches up to 97 percent; the capillary water suction time is below 24 seconds. The flocculating agent with the excellent floc precipitate dehydrating property and the preparation method thereof have the advantages that the flocculating agent and the formed flocs are of porous structures on a micro level; pores are mutually communicated with one another from interiors to body surfaces; water in sewage can naturally permeate from the pores, so that the sewage formed by the flocculating agent has the excellent dehydrating property.
Description
technical field [0001] The invention relates to a flocculant with excellent dehydration performance of floc sediments, which is applied in the sewage treatment industry and belongs to the technical field of environmental protection. Background technique [0002] Sustained population growth, gradual shortage of resources, and deteriorating environment have already become common problems faced by the whole world. my country's water pollution problem is extremely serious. 82% of rivers and lakes are polluted to varying degrees, which seriously threatens the survival of humans, animals and plants. It is urgent to continue to in-depth research and promote various water pollution prevention and treatment technologies. At present, the widely researched and applied water treatment technologies include flocculation sedimentation method, adsorption method, physical and chemical oxidation method, biological oxidation method, membrane filtration method, evaporation and other methods. W...
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