High-temperature high-salinity wastewater zero-discharging method
A high-temperature, high-salt, zero-emission technology, applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc., can solve problems such as no treatment method given, ecological environment troubles, etc., to achieve Significant social and environmental benefits, reduced energy consumption, and efficient utilization
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Embodiment 1
[0084] For a schematic diagram of the process, see figure 1 . The water quality characteristics of high-temperature and high-salt wastewater in the figure are: wastewater temperature 60°C, wastewater pH 6.5, conductivity 10000μs / cm, COD cr 0 mg / L, Na + 2000mg / L, Cl - 2500mg / L, total hardness (CaCO 3 ) 1000mg / L.
[0085] Proceed as follows:
[0086] (1) Nanofiltration. The high-temperature and high-salt wastewater with a certain temperature enters the nanofiltration unit for nanofiltration treatment to remove multivalent ions such as hardness and a small amount of organic matter in the high-temperature and high-salt wastewater.
[0087] After separation and concentration by the nanofiltration unit, the nanofiltration product water enters step (2) for processing, and sodium carbonate is added to the nanofiltration concentrated water to precipitate calcium ions to obtain calcium residue, which is then concentrated and dried. The dosage of sodium carbonate is Ca 2+ : The mo...
Embodiment 2
[0102] For a schematic diagram of the process, see figure 1 . The water quality characteristics of high-temperature and high-salt wastewater in the figure are: wastewater temperature 70°C, wastewater pH 7, conductivity 15000μs / cm, COD cr 50mg / L, Na + 3000mg / L, Cl - 3500mg / L, total hardness (CaCO 3 ) 2000mg / L.
[0103] The operation steps of embodiment 2 are the same as embodiment 1. Wherein, the difference from Example 1 is that sodium sulfate is added to the nanofiltration concentrated water to precipitate calcium ions, and the dosage of sodium sulfate is Ca 2+ : The molar ratio of sodium sulfate is 1:1; the supernatant of nanofiltration concentrated water after calcium ion precipitation is adsorbed by granular activated carbon, and the dosage of granular activated carbon is granular activated carbon:COD The mass ratio is 10:1 ; The pH of the nanofiltration product water is adjusted to 6.5 with hydrochloric acid, and then enters the membrane distillation unit for deep c...
Embodiment 3
[0117] For a schematic diagram of the process, see figure 1 . The water quality characteristics of high-temperature and high-salt wastewater in the figure are: wastewater temperature 80°C, wastewater pH 7.5, conductivity 20000μs / cm, COD cr 80mg / L, Na + 4000mg / L, Cl - 5000mg / L, total hardness (CaCO 3 ) 3000mg / L.
[0118] The operation steps of embodiment 3 are the same as embodiment 1. Wherein, different from Example 1, the nanofiltration concentrated water is added with a mixture of sodium carbonate and sodium sulfate for precipitation of calcium ions, and the dosage of the mixture of sodium carbonate and sodium sulfate is Ca 2+ The molar ratio of (sodium carbonate+sodium sulfate) is 1:1; the supernatant of nanofiltration concentrated water after calcium ion precipitation adopts powdered activated carbon to carry out activated carbon adsorption, and the dosage of powdered activated carbon is the mass of powdered activated carbon: COD The ratio is 2:1; the nanofiltration ...
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