A method for separation and purification of industrial high-salt wastewater
A technology of high-salt wastewater and purification method, which is applied in chemical instruments and methods, water/sewage treatment, water/sewage multi-stage treatment, etc. Storage, low efficiency and other problems, to achieve the effect of improving separation and purification efficiency, accumulation efficiency, and efficiency
Active Publication Date: 2021-02-05
山东三岳化工有限公司
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Problems solved by technology
However, sodium sulfate and sodium chloride cannot be removed by conventional membrane methods
[0004] At present, the multi-effect evaporation and crystallization method commonly used in the separation technology of industrial high-salt wastewater can realize the separation of salt in industrial high-salt wastewater until the wastewater is evaporated to dryness. The separation speed of salt makes a large amount of industrial high-salt wastewater waiting for separation and has no place to store, and the coarse salt obtained from separation contains high impurities, which cannot be reused and can only be treated as waste, resulting in waste
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[0030] use Figure 1 to Figure 5 The method for separating and purifying industrial high-salt wastewater according to one embodiment of the present invention is described as follows.
[0031] Such as figure 1 with figure 2 As shown, the specific embodiment of the present invention is a kind of industrial high-salt wastewater separation and purification method, the method comprises the following steps:
[0032] Step 1: Preliminarily evaporate and concentrate the wastewater with high salt content to form wastewater with higher salt content, so that the salt content of the wastewater is between 500 and 500,000 mg / l;
[0033] Step 2: After the waste water is preliminarily evaporated and concentrated in Step 1, the obtained waste water is treated at low temperature to reduce the temperature of the waste water to 1.5-2°C, so that the sodium sulfate in the waste water is precipitated, and the sodium sulfate is separated from the waste water ;
[0034] Step 3: After the sodium su...
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The invention belongs to the technical field of industrial high-salt wastewater treatment, and specifically relates to a method for separating and purifying industrial high-salt wastewater. The method includes the following steps: performing preliminary evaporation and concentration on wastewater with high salt content to form wastewater with higher salt content ;Treat the obtained waste water at low temperature, lower the temperature of the waste water to 1.5-2°C, precipitate the sodium sulfate in the waste water, and separate the sodium sulfate from the waste water; import the remaining waste water into industrial high-salt waste water for separation and purification Salt separation and purification are carried out in the device, so that the salt is gathered on the sphere; after the waste water is separated and purified, the separated and purified salt is retained and stored, and the waste water is discharged; the present invention conducts preliminary evaporation concentration and low-temperature treatment on the waste water to remove sodium sulfate from Separation of waste water; through the industrial high-salt waste water separation and purification device, the salt in the waste water is automatically precipitated and separated, the separation effect is good, the purification efficiency is high, and the salt can be effectively separated from the waste water.
Description
technical field [0001] The invention belongs to the technical field of industrial high-salt wastewater treatment, in particular to a method for separating and purifying industrial high-salt wastewater. Background technique [0002] Industrial high-salt wastewater comes from the membrane concentrate, and the calcium and magnesium ions and a small amount of heavy metal ions in the concentrate are basically removed in the lime soda softening section and ion exchange section in the membrane concentration process. Therefore, the discharged wastewater mainly contains sodium sulfate and sodium chloride salts. Among them, the sodium sulfate content is as high as 7%-13%, and the sodium chloride is 5%-8%; [0003] Sodium sulfate, an inorganic compound, sodium sulfate decahydrate, also known as Glauber's salt, high-purity, fine-grained anhydrous substance called Yuanmingfen; Yuanmingfen, white, odorless, bitter crystal or powder, hygroscopic. Appearance is colorless, transparent, lar...
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IPC IPC(8): C02F9/10C02F1/02C02F1/30C01D5/00
CPCC01D5/00C02F1/02C02F1/04C02F1/302C02F2001/5218C02F2303/26
Inventor 彭圆
Owner 山东三岳化工有限公司