Treatment method for wastewater containing fluorine, ammonia nitrogen and phosphorus

A treatment method and wastewater technology, applied in multi-stage water treatment, water/sewage treatment, water treatment parameter control, etc., can solve problems such as high time and energy consumption of ammonia nitrogen, calcium easily exceeding the standard, fluorosis and other problems

Active Publication Date: 2019-08-06
盛隆资源再生(无锡)有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Fluorine-containing ammonia nitrogen-containing wastewater is extremely harmful. Long-term drinking of high-fluorine wastewater will cause fluorosis and skeletal fluorosis. Wastewater containing ammonia nitrogen and phosphorus will cause eutrophication of the water body.
At present, the treatment methods of fluorine-containing ammonia-nitrogen-containing P-containing wastewater are mainly to remove F, P and ...

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  • Treatment method for wastewater containing fluorine, ammonia nitrogen and phosphorus

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Embodiment 1

[0025] In the fluorine-containing ammonia nitrogen-containing phosphorus wastewater, the fluorine content is 40 g / L, the ammonia nitrogen content is 15 g / L, and the phosphorous and hypophosphorous content is 0.5 g / L. Pour 2 tons of waste water containing fluorine, ammonia, nitrogen, and phosphorus into the reactor, add ammonia water to adjust the pH to 8.0, start stirring, slowly add 100 L of hydrogen peroxide, and raise the temperature to 40°C for 1 hour. Add 200L of concentrated phosphoric acid, evaporate at 120°C, 0.09MPa, dry the gas through the pipeline at 60°C with phosphorus pentoxide, and condense at 5°C to obtain anhydrous hydrogen fluoride. After measuring the fluorine content of the mother liquor, transfer it to another reactor, add 1.1 times the theoretical amount of silicon dioxide and stir for 1 hour to remove fluorine. The content of fluosilicic acid in the spray liquid of the spray tower was measured to be 20 wt%, and the water in the spray tower was changed. ...

Embodiment 2

[0027] In the fluorine-containing ammonia nitrogen-containing phosphorus wastewater, the fluorine content is 45 g / L, the ammonia nitrogen content is 17.5 g / L, and the phosphorous and hypophosphorous content is 0.75 g / L. Pour 2 tons of waste water containing fluorine, ammonia, nitrogen, and phosphorus into the reactor, add ammonia water to adjust the pH to 8.5, start stirring, slowly add 150 L of hydrogen peroxide, and raise the temperature to 50°C for 1.5 hours. Add 220L of concentrated phosphoric acid and evaporate at 125°C and 0.095MPa. The gas passes through the pipeline and is dried by phosphorus pentoxide at 70°C. After condensation at 8°C, anhydrous hydrogen fluoride is obtained. After measuring the fluorine content of the mother liquor, transfer it to another reactor, add 1.15 times the theoretical amount of silicon dioxide and stir for 1.5 hours to remove fluorine. The content of fluosilicic acid in the spray liquid of the spray tower was measured to be 23 wt%, and the...

Embodiment 3

[0029] In the fluorine-containing ammonia nitrogen-containing phosphorus wastewater, the fluorine content is 50 g / L, the ammonia nitrogen content is 20 g / L, and the phosphorous and hypophosphorous content is 1 g / L. Pour 2 tons of waste water containing fluorine, ammonia, nitrogen, and phosphorus into the reactor, add ammonia water to adjust the pH to 9, start stirring, slowly add 200 L of hydrogen peroxide, and heat up to 60°C for 2 hours. Add 240L of concentrated phosphoric acid, evaporate at 130°C, 0.1MPa, dry the gas through the pipeline at 80°C with phosphorus pentoxide, and condense at 10°C to obtain anhydrous hydrogen fluoride. After measuring the fluorine content of the mother liquor, transfer it to another reactor, add 1.2 times the theoretical amount of silicon dioxide and stir for 2 hours to remove fluorine, and press filter to collect the silicon dioxide for reuse in the next F removal. The content of fluosilicic acid in the spray liquid of the spray tower was measu...

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Abstract

The invention discloses a treatment method for wastewater containing fluorine, ammonia nitrogen and phosphorus. The treatment method comprises the following steps: (1) adding ammonia water to the wastewater to adjust the obtained solution to be alkaline, adding hydrogen peroxide to the wastewater, and performing heating and stirring; (2) adding concentrated phosphoric acid to the wastewater obtained in step (1), performing uniform stirring to adjust the obtained solution to be strong acidic, and heating and distilling the solution; (3) adding an excess amount of silica to a mother liquor obtained after the distillation in step (2), and performing stirring; (4) filtering a solution obtained in step (3) to remove silica, adding ammonia water to neutralize the obtained filtrate to be weakly acidic, and heating the filtrate to concentrate the filtrate; and (5) placing and centrifuging a mother liquor obtained in step (4) in a centrifuge to obtain ammonium dihydrogen phosphate crystals, andreusing the centrifuged clear liquid in the concentrating process in the step (4).

Description

technical field [0001] The present application designs a treatment method for fluorine-containing ammonia nitrogen-containing wastewater, especially a treatment method for fluorine-containing ammonia nitrogen-containing phosphorus wastewater. Background technique [0002] Wastewater containing fluorine and ammonia nitrogen is extremely harmful. Long-term drinking of high-fluoride wastewater will cause fluorosis, and wastewater containing ammonia nitrogen and phosphorus will cause eutrophication of water bodies. At present, the treatment methods of fluorine-containing ammonia-nitrogen-containing P-containing wastewater are mainly to remove F, P and deammonia, that is, to remove F and P by adding lime to blow off ammonia nitrogen. However, this method has relatively large limitations and the dosage of lime is huge. , the resulting mixture of calcium fluoride and lime needs subsequent treatment, and the calcium in the wastewater after F removal is likely to exceed the standard,...

Claims

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Application Information

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IPC IPC(8): C02F9/10C01B7/19C01B33/10C01B25/28C02F101/16C02F101/14C02F101/10
CPCC02F9/00C01B7/196C01B33/103C01B25/28C02F1/66C02F1/722C02F1/04C02F1/583C02F1/001C02F1/38C02F2101/16C02F2101/14C02F2101/105C02F2301/08C02F2209/06C02F2209/02
Inventor 陈琪叶龙张义根郎超
Owner 盛隆资源再生(无锡)有限公司
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