A method for advanced treatment of fluorine-containing wastewater
A technology for advanced treatment of waste water, applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc. To achieve the effect of enhanced coagulation effect, high fluorine removal efficiency and good adsorption effect
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Embodiment 1
[0036] A method for advanced treatment of fluorine-containing wastewater proposed in this embodiment comprises the following steps:
[0037] S1. Sedimentation: collect fluorine-containing wastewater, settle naturally for 5 hours, and send it to the regulating tank. Add calcium hydroxide slurry with a concentration of 15wt% to the regulating tank at a rate of 1.5m / min under stirring conditions, and control it in the regulating tank after mixing. The pH value is 4-6, and it is left to settle for 8 hours;
[0038] S2, flocculation: introduce the wastewater after the precipitation treatment in S1 into the reaction tank, add modified diatomite, wherein the preparation of the modified diatomite includes: adding water to the diatomite to obtain a pulp with a concentration of 20wt%, and Add 1.6wt% sodium hexametaphosphate and 0.4wt% sodium hydroxide based on diatomaceous earth, stir in a water bath at 50°C for 0.5h, let it stand for 0.6h, take the upper layer of mud and centrifuge, dr...
Embodiment 2
[0042] A method for advanced treatment of fluorine-containing wastewater proposed in this embodiment comprises the following steps:
[0043] S1. Sedimentation: collect fluorine-containing waste water, send it to the regulating tank after natural settlement for 8 hours, add calcium hydroxide slurry with a concentration of 20wt% to the regulating tank at a rate of 0.5m / min under stirring conditions, and control it in the regulating tank after mixing The pH value is 5-6, and it is left to settle for 6 hours;
[0044] S2, flocculation: introduce the wastewater after the precipitation treatment in S1 into the reaction tank, add modified diatomite, wherein the preparation of the modified diatomite includes: adding water to the diatomite to prepare a slurry with a concentration of 30wt%, and Add 1.2wt% sodium hexametaphosphate and 0.8wt% sodium hydroxide based on diatomaceous earth, stir in a water bath at 30°C for 1h, let stand for 0.3h, take the upper layer of mud and centrifuge, d...
Embodiment 3
[0048] A method for advanced treatment of fluorine-containing wastewater proposed in this embodiment comprises the following steps:
[0049] S1. Sedimentation: collect fluorine-containing waste water, send it to the regulating tank after natural sedimentation for 6 hours, add calcium hydroxide slurry with a concentration of 17wt% to the regulating tank at a rate of 1.0m / min under stirring conditions, and control it in the regulating tank after mixing The pH value is 4-6, and it is left to settle for 7 hours;
[0050] S2, flocculation: introduce the wastewater after the precipitation treatment in S1 into the reaction tank, add modified diatomite, wherein the preparation of the modified diatomite includes: adding water to the diatomite to prepare a pulp with a concentration of 25wt%, and Add 1.4wt% sodium hexametaphosphate and 0.6wt% sodium hydroxide based on diatomaceous earth, stir in a water bath at 40°C for 0.7h, let stand for 0.4h, take the upper layer of mud and centrifuge...
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