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A treatment system and treatment method for industrial wastewater containing fluorine and nitrate nitrogen

A treatment method, nitrate nitrogen technology, applied in multi-stage water treatment, water/sewage treatment, chemical instruments and methods, etc., can solve the problems of large amount of acid and alkali, high operating cost and high treatment cost

Active Publication Date: 2020-10-30
NANJING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the problems of high operating cost, high treatment cost and large amount of acid and alkali used in the treatment of waste water containing high fluorine and high nitrate nitrogen, the present invention provides a method for treating general waste water with ultrafiltration and reverse osmosis systems, and then performing biochemical removal. The treatment system and treatment method of chemical precipitation and fluoride removal after nitrogen reduce the amount of acid and alkali dosage in the treatment process of wastewater containing high fluorine and high nitrate nitrogen, and reduce the treatment cost

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  • A treatment system and treatment method for industrial wastewater containing fluorine and nitrate nitrogen
  • A treatment system and treatment method for industrial wastewater containing fluorine and nitrate nitrogen
  • A treatment system and treatment method for industrial wastewater containing fluorine and nitrate nitrogen

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Embodiment 1

[0035] An example of a solar cell company's fluorine-containing wastewater treatment project. A company invested in a solar cell manufacturing project, and its discharged wastewater is mainly general wastewater and concentrated acid wastewater. The design scale of wastewater treatment project is 5000m 3 / d, divided into physical and chemical treatment and biochemical treatment.

[0036] General waste water mainly comes from the pure water cleaning waste water in each section, the regular drainage of the acid mist alkali spray tower, the waste gas incineration tail gas and the ammonia water cleaning gas water spray tower treatment and regular drainage. The ion concentration and nitrate nitrogen content are not high, and there is almost no organic matter. Therefore, pollutants with a particle size larger than 5 μm can be filtered out through activated carbon filters and security filters, and then directly introduced into ultrafiltration and reverse osmosis systems.

[0037] Con...

Embodiment 2

[0050] The waste water in this embodiment comes from another batch of waste water discharged by the solar cell enterprise, and the general waste water of this batch contains F - The concentration is 85mg / L, the concentration of nitrate nitrogen is 150mg / L, the pH is 6, the F of strongly acidic high-fluorine wastewater - The concentration is 7500mg / L, the nitrate nitrogen concentration is 1300mg / L, and the pH is 3. The treatment steps include:

[0051] (1) Collect the general wastewater after simple filtration in the general wastewater pool, and separate the general wastewater into fluorine-containing nitrate-nitrogen concentrated water and clear water through ultrafiltration and reverse osmosis systems. The concentrated nitrogen water is introduced into the adjustment tank, and the clear water is imported into the reuse pool; the ultrafiltration membrane used is DOW SFP-2880 purchased from Dow Chemical in the United States, and the reverse osmosis membrane used is BW30- 400FR...

Embodiment 3

[0060] The waste water in this embodiment comes from another batch of waste water discharged by the solar cell enterprise, and the general waste water of this batch contains F - The concentration is 100mg / L, the concentration of nitrate nitrogen is 200mg / L, the pH is 7, the F of strongly acidic high-fluorine wastewater - The concentration is 10000mg / L, the nitrate nitrogen concentration is 1600mg / L, and the pH is 5. The treatment steps include:

[0061] (1) Collect the general wastewater after simple filtration in the general wastewater pool, and separate the general wastewater into fluorine-containing nitrate-nitrogen concentrated water and clear water through ultrafiltration and reverse osmosis systems. The concentrated nitrogen water is introduced into the adjustment tank, and the clear water is imported into the reuse pool; the ultrafiltration membrane used is DOW SFP-2880 purchased from Dow Chemical in the United States, and the reverse osmosis membrane used is BW30- 400...

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Abstract

The invention discloses a treatment system and treatment method of fluorine-containing and nitrate nitrogen-containing industrial waste water, which belongs to the technical field of waste water treatment. The treatment system and method are used for firstly separating ordinary waste water into fluorine-containing and nitrate nitrogen-containing concentrated water and clean water by virtue of a hyperfiltration and reverse osmosis system, then mixing the fluorine-containing and nitrate nitrogen-containing concentrated water and strong-acidic waste water, guide the mixed water into a denitrification pool, and discharge the water up to standard after the fluorine removal by virtue of denitrification nitrogen removal and a chemical precipitation method. By adopting the method disclosed by theinvention, the biochemical and chemical precipitated waste water amount can be effectively reduced, the floor occupation area of a waste water pool can be reduced, and the fixed investment cost is decreased; and in addition, an alkali precipitation unit is arranged behind a biochemical reaction unit, so that the acid consumption and alkali increasing effect of the denitrification reaction can be sufficiently utilized, the cost of a great amount of alkali for removing fluorine and a great amount of acid for the denitrificaiton process in the traditional process is decreased, and the treatment system and the treatment method are suitable for the industrialized application.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and more specifically relates to a treatment system and method for industrial wastewater containing fluorine and nitrate nitrogen. Background technique [0002] In recent years, my country's photovoltaic, integrated circuit and other silicon industries have developed rapidly, bringing huge economic benefits to the society, but also bringing new environmental problems. In the production process of polycrystalline silicon wafers, nitric acid and hydrofluoric acid are generally used for texturing and etching, and then high-purity water is used for cleaning. In this process, two types of waste water will be produced. One type of waste water is composed of waste acid and waste lye. Because the amount of waste acid is large and the amount of waste lye is small, the mixed waste water is highly acidic and has a low pH value. , which contains high fluoride ions and nitrate nitrogen, is calle...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14
CPCC02F1/441C02F1/444C02F1/583C02F1/66C02F3/28C02F9/00C02F2101/14C02F2101/163C02F2301/08
Inventor 张炜铭潘丙才吕路
Owner NANJING UNIV
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