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A kind of treatment method of fluorine-containing ammonium salt wastewater

A treatment method and wastewater technology, applied in multi-stage water treatment, water/sewage treatment, water/sewage multi-stage treatment, etc., can solve the problems of MVR equipment being corroded by fluorine, low operating efficiency, and short equipment life

Active Publication Date: 2022-08-02
湖南中金岭南康盟环保科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, if the RO+MVR process is directly applied to the zero-discharge treatment of fluorine-containing ammonium salt wastewater, especially when the fluoride ion concentration of the MVR evaporation liquid is higher than 50mg / L, the MVR equipment is prone to be corroded by fluorine, and the equipment life is short and the operating efficiency is low. , difficult to maintain and other issues, which is not conducive to the operation and management of the overall process

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  • A kind of treatment method of fluorine-containing ammonium salt wastewater
  • A kind of treatment method of fluorine-containing ammonium salt wastewater

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Experimental program
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Effect test

Embodiment 1

[0066] The composition of fluoride-containing ammonium salt wastewater is as follows:

[0067] The ammonia nitrogen concentration was 8.4g / L, the fluoride ion concentration was 140mg / L, the pH was 0.8, the calcium ion concentration was 20mg / L, the sulfate group concentration was 50.1g / L, and the phosphate group concentration was 7.0g / L.

[0068] The treatment methods of fluorine-containing ammonium salt wastewater include (see figure 1 ):

[0069] 1) To 450m 3 Lime water with a mass concentration of 15% (wherein, the amount of lime used is 2.64t), the molar ratio of calcium element to fluorine element is 10.8:1, and the pH is 10.0 is added to the fluorine-containing ammonium salt wastewater, and the precipitation and defluorination reaction is carried out. After 1h, after filtration and drying, 10.1t of dry slag (containing calcium fluoride, calcium sulfate and calcium phosphate) and 465m 3 The first filtrate; the fluoride ion concentration in the first filtrate is 11.0 mg / ...

Embodiment 2

[0076] The composition of the fluorine-containing ammonium salt wastewater is the same as that of Example 1.

[0077] The treatment methods of fluoride-containing ammonium salt wastewater include:

[0078] 1) To 450m 3 Add lime water with a mass concentration of 15% (wherein, the amount of lime is 2.63t, the molar ratio of calcium element and fluorine element is 10.7:1, pH is 7.0, and the precipitation defluorination reaction is carried out. After 0.5h, after filtration and drying, 10.0t dry residue and 465m 3 The first filtrate; the fluoride ion concentration in the first filtrate is 11.2 mg / L;

[0079] 2) Add 0.99t of sodium carbonate to the first filtrate, the molar ratio of carbon element and calcium element is 1:1, pH is 8.5, carry out precipitation and decalcification reaction, after 0.5h of reaction, filter to obtain 464m 3 The second filtrate and the second filter residue; the calcium ion concentration in the second filtrate is 4.5 mg / L;

[0080] 3) in the second f...

Embodiment 3

[0085] The composition of the fluorine-containing ammonium salt wastewater is the same as that of Example 1.

[0086] The treatment methods of fluoride-containing ammonium salt wastewater include:

[0087] 1) To 450m 3Lime water with a mass concentration of 15% (wherein, the amount of lime used is 2.64t), the molar ratio of calcium element to fluorine element is 10.7:1, and the pH is 9.5 is added to the fluorine-containing ammonium salt wastewater, and the precipitation and defluorination reaction is carried out. After 1h, after filtration and drying, 10.10t dry slag and 465m 3 The first filtrate; the fluoride ion concentration in the first filtrate is 10.1 mg / L;

[0088] 2) Add 1.97t of sodium carbonate to the first filtrate, the molar ratio of carbon element to calcium element is 2:1, pH is 9.7, carry out precipitation and decalcification reaction, after 0.5h of reaction, filter to obtain 464m 3 The second filtrate and the second filter residue; the calcium ion concentrat...

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Abstract

The invention relates to the technical field of wastewater treatment, in particular to a method for treating fluorine-containing ammonium salt wastewater, comprising the following steps: A) performing a precipitation and defluorination reaction on the fluorine-containing ammonium salt wastewater, and filtering to obtain a first filtrate and a first filter residue B) carry out the precipitation decalcification reaction with the described first filtrate, after filtration, obtain the second filtrate and the second filter residue; C) adjust the pH value of the second filtrate to be 5~6, obtain pH adjusting solution; D) The pH adjustment solution is subjected to RO concentration to obtain RO fresh water and RO concentrated water. Through a series of measures such as calcium salt precipitation, corrosion inhibitor protection, and ammonia water pH adjustment, the present invention effectively reduces the concentration of fluoride ions in fluoride-containing ammonium salt wastewater, avoids the corrosion of fluoride ions to subsequent MVR equipment, and at the same time, can ensure that fluoride ions contain The long-term stable, high-efficiency and zero-discharge treatment of ammonium fluoride wastewater has the advantages of simple and easy-to-obtain chemicals, low cost, simple operation and control, small slag volume, and stable operation effect.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a treatment method for fluorine-containing ammonium salt wastewater. Background technique [0002] In the production process of smelting, chemical, battery materials (iron phosphate) and other industries, with the widespread use of ammonia water, a large amount of ammonium salt wastewater is generated, such as ammonium sulfate wastewater or ammonium chloride wastewater. At the same time, secondary wastewater often contains low and medium concentrations of fluoride ions. According to the characteristics of water quality, the treatment of such fluorine-containing ammonium salt wastewater requires separate treatment of two types of pollutants, ammonia nitrogen and fluoride ions. Flocculation precipitation method, adsorption method to remove fluoride ions. [0003] With the increasingly strict supervision of the above-mentioned industries, more and more regions require...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F9/10C02F101/14C02F101/16
CPCC02F9/00C02F2101/14C02F2101/16C02F1/5236C02F1/441C02F1/66C02F1/04C02F2301/08
Inventor 彭佳乐周康根余承红吴班周晚根姜科赵自强周惠高峰潘希贤
Owner 湖南中金岭南康盟环保科技有限公司