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
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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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