A zero-discharge method for high-salt and high-ammonia-nitrogen wastewater
A high-ammonia-nitrogen, zero-emission technology, applied in chemical instruments and methods, water pollutants, multi-stage water/sewage treatment, etc. high rate effect
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Embodiment 1
[0053] For a schematic diagram of the process, see figure 1 . The water quality characteristics of high-salt and high-ammonia-nitrogen wastewater 1 in the figure are: wastewater pH 8.5, conductivity 5mS / cm, COD cr 80mg / L, SS100mg / L, Na + 1000mg / L, NO 3 - 2000mg / L, Cl - 50mg / L, Ca 2+ 0mg / L, NH 4 -N500mg / L.
[0054] The membrane absorption module used is a polytetrafluoroethylene (PTFE) hollow fiber microporous hydrophobic membrane module with a membrane pore size of 0.2 μm; the nanofiltration membrane module used is a polyamide roll-type membrane module with a membrane pore size of 2 nm; the forward osmosis membrane module used is Cellulose acetate plate and frame membrane module;
[0055] Proceed as follows:
[0056] (1) Membrane absorption: high-salt and high-ammonia-nitrogen wastewater is pumped into the feed liquid side of the membrane absorption unit for circulation; as the absorption liquid, sulfuric acid with a concentration mass fraction of 5% is pumped into t...
Embodiment 2
[0065] For a schematic diagram of the process, see figure 1 . The water quality characteristics of high-salt, high-ammonia-nitrogen wastewater 1 in the figure are: wastewater pH9.3, conductivity 25mS / cm, COD cr 80mg / L, SS100mg / L, Na + 5000mg / L, NO 3 - 10000mg / L, Cl - 270mg / L, Ca 2+ 20mg / L, NH 4 -N6000mg / L.
[0066] The membrane absorption module used is a polytetrafluoroethylene (PTFE) hollow fiber microporous hydrophobic membrane module with a membrane pore size of 0.2 μm; the nanofiltration membrane module used is a polyamide roll-type membrane module with a membrane pore size of 2 nm; the forward osmosis membrane module used is Cellulose acetate plate and frame membrane module;
[0067] What is different from Example 1 in the operation steps is: the absorption liquid used in the step (1) is a sulfuric acid solution with a concentration mass fraction of 7%; the coolant for the cooling crystallization unit adopts water with ice cubes; when the step (1) When the pH o...
Embodiment 3
[0072] For a schematic diagram of the process, see figure 1 . The water quality characteristics of high-salt, high-ammonia-nitrogen wastewater 1 in the figure are: wastewater pH 10, conductivity 50mS / cm, COD cr 80mg / L, SS200mg / L, Na + 10000mg / L, NO 3 - 20000mg / L, Cl - 500mg / L, Ca 2+ 30mg / L, NH 4 -N10000mg / L.
[0073] The membrane absorption module used is a polytetrafluoroethylene (PTFE) hollow fiber microporous hydrophobic membrane module with a membrane pore size of 0.2 μm; the nanofiltration membrane module used is a polyamide roll-type membrane module with a membrane pore size of 2 nm; the forward osmosis membrane module used is Cellulose acetate plate and frame membrane module;
[0074] What is different from Example 1 in the operation steps is that: the absorption liquid used in the step (1) is a sulfuric acid solution with a concentration mass fraction of 10%; the cooling agent for cooling crystallization adopts tap water; when the pH of the ammonium sulfate so...
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