Preparation method of composite flocculant for wastewater purification
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A composite flocculant and polymer flocculant technology, applied in chemical instruments and methods, flocculation/sedimentation water/sewage treatment, water/sewage treatment, etc. , the effect of reducing secondary biochemical pollution
Inactive Publication Date: 2016-07-20
徐亚萍
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[0003] The coagulation treatment of wastewater generally uses inorganic coagulants, mainly iron salts and aluminum salts, which have certain effects on the removal of wastewater turbidity, color and COD, but such inorganic coagulants remain after treatment. Large amount, after hydrolysis, new ions and inorganic salts will gradually accumulate in the recovered pulp water
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Embodiment 1
[0018] The raw materials of the composite flocculant in this embodiment are proportioned in parts by weight as follows: modified bentonite 32, polymer flocculant 18, tripotassium phosphate 5, calcium sulfate 6.
[0019] Prepare the raw materials according to the above weight ratio; mix homogeneously, put the modified bentonite and polymer flocculant into a high-speed homomixer and mix them, and observe the mixed particle size distribution under a 1000 times microscope after a certain period of time, and the mixing degree is higher than 98. % is qualified.
[0020] Load tripotassium phosphate and calcium sulfate into the ball mill, start the machine for 30 minutes, add the mixed materials in batches after the above time, and ball mill for 60 minutes to obtain the water purifying agent.
[0021] Among them, the polymer flocculant in the raw material is prepared by the following process:
[0022] Below 40°C, gradually add epichlorohydrin to dimethylamine, and then add modifier t...
Embodiment 2
[0026] The raw materials of the composite flocculant in this embodiment are proportioned in parts by weight as follows: modified bentonite 40, polymer flocculant 24, tripotassium phosphate 12, calcium sulfate 11.
[0027] Prepare the raw materials according to the above weight ratio; mix homogeneously, put the modified bentonite and polymer flocculant into a high-speed homomixer and mix them, and observe the mixed particle size distribution under a 1000 times microscope after a certain period of time, and the mixing degree is higher than 98. % is qualified.
[0028] Load tripotassium phosphate and calcium sulfate into the ball mill, start the machine for 30 minutes, add the mixed materials in batches after the above time, and ball mill for 90 minutes to obtain the water purifying agent.
[0029] Among them, the polymer flocculant in the raw material is prepared by the following process:
[0030] Below 40°C, gradually add epichlorohydrin to dimethylamine, and then add modifier...
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Abstract
The invention discloses a preparation method of a composite flocculant for wastewater purification. The composite flocculant is prepared from the following raw materials in parts by weight: 32 to 40 parts of modified bentonite, 18 to 24 parts of a polymeric flocculant, 5 to 12 parts of tripotassium phosphate and 6 to 11 parts of calcium sulfate. The method comprises the following steps: (1) preparing the raw materials in parts by weight; (2) performing homogeneous mixing, namely mixing the modified bentonite and the polymeric flocculant in a high-speed homogeneous mixer, observing mixed granularity distribution under a 1,000* microscope after a certain time, and determining that the mixed granularity distribution is qualified if the mixing homogeneity is equal to or higher than 98 percent; (3) loading the tripotassium phosphate and the calcium sulfate in a ball mill, starting the ball mill for 30 minutes, adding the materials homogeneously mixed in Step (2) in batches after the time, and performing ball milling for 60 to 90 minutes to obtain a water purifying agent. The composite flocculant is high in yield and low in total cost, the preparation and using methods are both simple and easy, and the TDS, electrical conductivity and COD of wastewater can be obviously reduced only with a small dosage of the composite flocculant.
Description
technical field [0001] The invention relates to a preparation method of a composite flocculant for purifying waste water. Background technique [0002] With the rapid improvement of my country's industrialization of production and living standards, the annual discharge of production wastewater and domestic sewage is also increasing rapidly in series. Efficient and safe treatment of these wastewater and sewage is a challenge for the coordinated development of environmental protection and resource utilization. It is also one of the difficulties that many chemical companies urgently need to get rid of. [0003] The coagulation treatment of wastewater generally uses inorganic coagulants, mainly iron salts and aluminum salts, which have certain effects on the removal of wastewater turbidity, color and COD, but such inorganic coagulants remain after treatment. If the amount is large, new ions and inorganic salts will gradually accumulate in the recovered slurry after hydrolysis. ...
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