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A method for extracting Glauber's salt and industrial salt from high-salt wastewater

A high-salt wastewater and industrial salt technology, applied in chemical instruments and methods, alkali metal sulfite/sulfite, alkali metal chloride, etc., can solve the problems of inability to obtain qualified nitrate or salt industrial products, restrictions on implementation, and non-compliance It is possible to realize the separation of nitrate and salt, and achieve the effect of high reuse rate, high recovery rate, low COD and NH3-N

Inactive Publication Date: 2017-11-07
东莞市英硫净水服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0015] However, for high-salt wastewater, if the above-mentioned salt mining technology is directly applied, it is impossible to separate nitrate and salt, and it is also impossible to obtain qualified nitrate or salt industrial products
[0016] Therefore, it is necessary to implement reclaimed water reuse and zero discharge of wastewater. If this problem is not solved, it will greatly limit the implementation of this policy.

Method used

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  • A method for extracting Glauber's salt and industrial salt from high-salt wastewater
  • A method for extracting Glauber's salt and industrial salt from high-salt wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Utilize the treatment method of the present invention to process high-nitrate and low-salt wastewater:

[0061] This is high-salt wastewater after extreme concentration by nanofiltration membrane, and its characteristics are:

[0062] Glauber's salt (Na 2 SO 4 ) 80g / L; salt (NaCl) 20g / L; total salt TDS 100g / L;

[0063] The proportion of nitrate in total salt TDS: nitrate>80%, salt<20%, and the ratio of nitrate to salt is less than 1:0.25.

[0064] The present invention is as follows to the treatment step of above-mentioned waste water:

[0065] Step 1: Oxidation: with H 2 SO 4 Adjust the pH of the wastewater to 3 while adding FeSO 4 and a concentration of 30% H 2 o 2 , reaction for 2 hours, FeSO 4 The addition amount is 500 mg / L, and the oxidation-reduction potential value is controlled at ORP500mv to remove organic pollutants in wastewater.

[0066] Step 2: Softening: Add 30% NaOH and 70% Na 2 CO 3 Adjust the pH value of the wastewater to 9, and at the same...

Embodiment 2

[0073] Utilize the treatment method of the present invention to process high-nitrate and low-salt wastewater:

[0074] This is high-salt wastewater after extreme concentration by nanofiltration membrane, and its characteristics are:

[0075] Glauber's salt (Na 2 SO 4 ) 120g / L; salt (NaCl) 30g / L; total salt TDS 150g / L;

[0076] The proportion of nitrate in total salt TDS: nitrate>80%, salt<20%, and the ratio of nitrate to salt is less than 1:0.25.

[0077] The present invention is as follows to the treatment step of above-mentioned waste water:

[0078] Step 1: Oxidation: with H 2 SO 4 Adjust the pH of the wastewater to 3 while adding FeSO 4 and a concentration of 30% H 2 o 2 , reaction for 2 hours, FeSO 4 The addition amount is 500 mg / L, and the oxidation-reduction potential value is controlled at ORP600mv to remove organic pollutants in wastewater.

[0079] Step 2: Softening: Add 30% NaOH and 70% Na 2 CO 3 Adjust the pH value of the wastewater to 9, and at the sam...

Embodiment 3

[0086] Utilize the treatment method of the present invention to process high-salt and low-nitrate wastewater:

[0087] The salt mining brine of the salt mine is re-concentrated in the primary mother liquor, and the secondary mother liquor after freezing and out of stock is all high-salt and low-nitrification wastewater. The characteristics are:

[0088] Salt (NaCl) 200g / L; Nitrate (NaCl) 2 SO 4 ) 20g / L; total salt TDS 220g / L;

[0089] The proportion of nitrate in total salt TDS: nitrate 90%, and the ratio of nitrate to salt is higher than 1:9.

[0090] The present invention is as follows to the treatment step of above-mentioned waste water:

[0091] Step 1: Oxidation: with H 2 SO 4 Adjust the pH of the wastewater to 5 while adding FeSO 4 and a concentration of 30% H 2 o 2 , reaction for 1 hour, FeSO 4 The addition amount is 800mg / L, and the oxidation-reduction potential value is controlled at ORP800mv to remove organic pollutants in wastewater.

[0092] Step 2: Softe...

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Abstract

The present invention relates to the technical field of waste water treatment, extraction and recovery, and specifically relates to a method for extracting mirabilite and industrial salt from high-salt waste water. Finally, the series of steps of preparing industrial salt can extract the mirabilite and industrial salt from the high-salt wastewater for industrial reuse, and the purification rate is high, and the final wastewater can be directly discharged without polluting the environment.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, extraction and recovery, in particular to a method for extracting mirabilite and industrial salt from high-salt wastewater. Background technique [0002] High-salt wastewater refers to wastewater with a salt content greater than 10%. 2 SO 4 ), salt (NaCl) and various pollutants. [0003] It is mainly produced in the membrane concentrated water produced in the membrane section during the process of industrial wastewater reuse or zero discharge: the specific process is as follows: figure 1 shown; [0004] There are also cases where such high-salt wastewater is directly produced by the process. For example, the salting-out wastewater of the dye industry, mustard vegetable wastewater or electroplating sludge acid dissolves Cu-Ni, and then neutralizes and precipitates Cu(OH) 2 , Ni(OH) 2 Wastewater is generated, but this is not the case much, and the amount of water is small. [00...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D5/00C01D3/04
Inventor 袁伟光
Owner 东莞市英硫净水服务有限公司
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