Composite coagulant and preparation method thereof
A technology of coagulant and inorganic coagulant, applied in chemical instruments and methods, flocculation/sedimentation water/sewage treatment, water/sludge/sewage treatment, etc. Coagulation treatment effect, acceleration of floc formation and sedimentation, and the effect of simple preparation method
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Embodiment 1
[0029] Embodiment one: a kind of composite coagulant, the preparation method of this composite coagulant, comprises the following steps: 1) preparation organic coagulant: take by weighing 1g PAM, cPAM, certain one or several kinds of PDADMAAC etc. are dissolved in Prepare a mixed solution with a mass fraction of 1‰ in 100ml deionized water.
[0030] 2) Preparation of inorganic coagulant: 10 g of polyaluminum iron silicate was weighed and dissolved in 100 ml of deionized water to prepare an inorganic coagulant solution with a mass fraction of 10%.
[0031] 3) Preparation of fusion agent: the composition of the fusion agent is calcium oxide. Weigh 10 g of calcium oxide with a particle size of 300 mesh and dissolve it in 100 ml of deionized water to obtain a milk of lime mixed solution with a mass fraction of 10%.
[0032] 4) Prepare stabilizer: the stabilizer component is hydroxymethyl ethyl cellulose. Weigh 0.5 g of hydroxymethyl ethyl cellulose and dissolve it in 100 ml of d...
Embodiment 2
[0039] Example 2: The preparation steps of composite coagulant A and composite coagulant B in this example are the same as those in Example 1.
[0040] In this embodiment, the coagulation treatment object is paint wastewater, and the COD concentration of the wastewater is 5537mg / L. The composite coagulant A prepared by fusion and the composite coagulant B prepared by mixing were used to treat wastewater respectively, and the coagulation effect of the two composite coagulants was compared by the COD removal rate.
[0041] Add 10L of waste water to the 5 coagulation reactors, start the agitator, and the stirring speed is 150r / min to keep the same; then add 0.25ml and 0.5ml of the above-mentioned composite coagulant A to the coagulation reactor respectively, 1.0ml, 1.5ml, 2mL, stir rapidly for 30s; adjust the stirring speed to 50r / min, stir slowly for 10min, turn off the stirrer, and after standing for 10min, take samples from 5 coagulation reactors to analyze the COD removal rat...
Embodiment 3
[0044] Example three: 1) Preparation of organic coagulant: add 18.5ml dimethyl diallyl ammonium chloride, 11.2g acrylamide, 70.3ml pure water to the reaction kettle successively, add 0.003gEDTA-2Na respectively after dissolving , 0.005g isopropanol, 0.001g urea, nitrogen gas flow at 35°C for 30-40min, add 0.012g ammonium persulfate to react for 10min, then add 0.003g sodium bisulfite, continue to react at 35°C for 1.5h; Adjust to 60°C, adjust the temperature to 60°C and continue the reaction for 1.5h to obtain a self-made organic coagulant.
[0045] 2) Preparation of inorganic coagulant: This step is the same as the corresponding step in Example 1.
[0046] 3) Preparation of fusion agent: This step is the same as the corresponding step in Example 1.
[0047] 4) Prepare stabilizer: this step is the same as the corresponding step in Example 1.
[0048] 5) Preparation of fused organic-inorganic composite coagulant: Add 65% volume percentage of inorganic coagulant, 30% organic c...
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