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Fluorine and silicon removal method for reverse osmosis concentrated water

A technology of reverse osmosis concentrated water and water body, which is applied in reverse osmosis, water softening, chemical instruments and methods, etc., can solve the problems of increased sludge volume and high cost of chemicals, and achieves reduced sludge volume, good effect, and reduced treatment. cost effect

Pending Publication Date: 2021-10-08
BEIJING GUODIAN FUTONG SCI & TECH DEV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In the prior art, calcium agents are used to supplement calcium ions in reverse osmosis concentrated water treatment, calcium ions and fluoride ions generate calcium fluoride particles, and then polyaluminum chloride (PAC) or polyferric sulfate (PFS) is added as a flocculant , add polyacrylamide (PAM) as a coagulant aid, and due to the dispersion of scale inhibitors in reverse osmosis concentrated water, it is often necessary to add an excessive amount of calcium to achieve effective removal of fluorine. Excessive calcium in water, then A large amount of sodium carbonate needs to be added for decalcification, resulting in high cost of chemicals and an increase in the amount of sludge produced

Method used

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  • Fluorine and silicon removal method for reverse osmosis concentrated water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The reverse osmosis concentrated water volume of a coking wastewater plant is 30m 3 , the water quality is as follows:

[0025] pH=5.63, Ca=11.8mg / L, Mg=15.8mg / L, HCO 3 =50.6mg / L, CO 3 =0mg / L, F=251mg / L, SiO 2 =99.54mg / L.

[0026] use as figure 1 The method flow shown, (1) The reverse osmosis concentrated water enters the 1# reaction tank, and the aluminum agent is added to the 1# reaction tank to remove fluorine. The aluminum agent is aluminum sulfate, and the dosage is 820mg per 1L of reverse osmosis concentrated water, Sodium hydroxide is used to adjust the pH, so that the pH is maintained at about 7-7.5, and the reaction time is 30 minutes;

[0027] (2) The formed floc enters the 1# clarification tank, and the residence time is 2h to obtain clarified reverse osmosis concentrated water;

[0028] Step (1) and step (2) are primary softening and clarification, the effluent water quality at this stage is: F=82mg / L, SiO 2 =84mg / L.

[0029] (3) The clarified revers...

Embodiment 2

[0034] The reverse osmosis concentrated water of a coal chemical project, the water quality is as follows:

[0035] pH=6.7, Ca=33.5mg / L, Mg=24.7mg / L, HCO 3 =80mg / L, CO 3 =0mg / L, F=199mg / L, SiO 2 =55 mg / L.

[0036] use as figure 1 In the method flow shown, (1) the reverse osmosis concentrated water enters the 1# reaction tank, and the aluminum agent is added to the 1# reaction tank to remove fluorine. The aluminum agent is aluminum chloride, and the dosage is 510mg per 1L of the reverse osmosis concentrated water. Add sodium hydroxide to adjust the pH, so that the pH is maintained at about 7.5, and the reaction time is 60 minutes;

[0037] (2) The formed floc enters the 1# clarification tank, and the residence time is 4h to obtain clarified reverse osmosis concentrated water;

[0038] Step (1) and step (2) are primary softening and clarification, the effluent water quality at this stage is: F=67mg / L, SiO 2 =44mg / L.

[0039] (3) The clarified reverse osmosis concentrated ...

Embodiment 3

[0044] The reverse osmosis concentrated water of a coal chemical project, the water quality is as follows:

[0045] pH=6.8, Ca=40mg / L, Mg=40mg / L, HCO 3 =50mg / L, CO 3 =0mg / L, F=150mg / L, SiO 2 = 100 mg / L.

[0046] use as figure 1 The method flow shown, (1) The reverse osmosis concentrated water enters the 1# reaction tank, and the aluminum agent is added to the 1# reaction tank to remove fluorine. The aluminum agent is aluminum chloride and aluminum sulfate, and the dosage is 1L of reverse osmosis concentrated water Add 173mg of aluminum chloride and 221mg of aluminum sulfate, add sodium hydroxide to adjust the pH, keep the pH at about 7.5, and the reaction time is 50min;

[0047] (2) The formed floc enters the 1# clarification tank, and the residence time is 3h to obtain the clarified reverse osmosis concentrated water;

[0048] Step (1) and step (2) are primary softening and clarification, the effluent quality of this stage is: F=52mg / L, SiO 2 =91 mg / L.

[0049](3) The ...

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Abstract

The invention discloses a fluorine and silicon removal method for reverse osmosis concentrated water, which comprises two stages of softening and clarifying steps. In the first-stage softening and clarifying, the reverse osmosis concentrated water enters a first reaction tank and a first clarification tank in sequence. In the second-stage softening and clarifying, effluent of the first-stage softening and clarifying enters a second reaction tank, a flocculation tank and a second clarification tank in sequence. An aluminum agent is added into the first reaction tank to remove fluorine, and sodium metaaluminate is added into the second reaction tank to remove silicon. According to the method disclosed by the invention, fluorine ions and silicon ions in the concentrated water can be efficiently removed by adding a small amount of agents.

Description

technical field [0001] The invention relates to a method for removing fluorine and silicon, in particular to a method for removing fluorine and silicon in reverse osmosis concentrated water, and belongs to the technical field of water treatment. Background technique [0002] In the wastewater zero discharge process, in order to reduce the investment and operating costs of the evaporation unit, reverse osmosis is usually used to pre-concentrate the incoming water. Due to the high impurity ions in wastewater, which often contain fluoride ions, silica, hardness, alkalinity and other scaling and corrosion ions, after concentration, reverse osmosis concentrated water needs further treatment before it can enter subsequent concentration units such as reverse osmosis and evaporation crystallization. . [0003] Existing researches seldom carry out fluorine removal and silicon removal treatment on reverse osmosis concentrated water. For example, patent CN111559805A discloses a revers...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F101/10C02F101/14C02F103/34B01D61/10B01D61/02
CPCC02F9/00C02F2101/14C02F2101/10C02F1/66C02F2209/06C02F2001/007C02F2301/08C02F1/5236C02F2209/44C02F2103/34C02F5/06B01D61/10B01D61/02
Inventor 崔粲粲于洸滕济林田颖张萌丁绍峰李郑坤
Owner BEIJING GUODIAN FUTONG SCI & TECH DEV
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