A treatment method for high-salt ammonia nitrogen wastewater
A technology for ammonia nitrogen wastewater and treatment methods, which is applied in the fields of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., and can solve the problem of inability to realize the purpose of water resource reuse and unfavorable long-term stable operation of membrane distillation , Membrane fouling of membrane distillation and other problems, to achieve the effect of prolonging the continuous and stable operation time, ensuring long-term stable operation, and light membrane fouling
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Embodiment 1
[0057] For a schematic diagram of the process, see figure 1 , the schematic diagram of the device is shown in figure 2 . The water quality characteristics of the high-salt ammonia nitrogen wastewater 15 in the figure are: wastewater pH 7.2, conductance 15mS / cm, COD cr 60mg / L, SS130mg / L, Ca 2+ 25mg / L, Cu110mg / L, Zn32mg / L, NH 4 -N390mg / L. Forward osmosis raw water 1 is a glucose solution with a mass concentration of 5%.
[0058] The forward osmosis membrane module used is a cellulose acetate plate-and-frame membrane module; the membrane distillation module used is a polytetrafluoroethylene (PTFE) hollow fiber hydrophobic membrane module with a membrane pore size of 0.2 μm, and the membrane distillation form is an internal pressure vacuum membrane distillation.
[0059]The steps are as follows: (1) adjust the pH of the high-salt ammonia-nitrogen wastewater 15 to 6; (2) the adjusted high-salt ammonia-nitrogen wastewater enters the membrane distillation heating pool 9 and is ...
Embodiment 2
[0064] For a schematic diagram of the process, see figure 1 , the schematic diagram of the device is shown in figure 2 . The water quality characteristics of the high-salt ammonia nitrogen wastewater 15 are the same as those in Example 1. Forward osmosis raw water 1 is a whey protein solution with a mass concentration of 5%.
[0065] The forward osmosis membrane module used is a cellulose acetate plate-and-frame membrane module; the membrane distillation module used is a polypropylene (PP) hollow fiber hydrophobic membrane module with a membrane pore size of 0.2 μm, and the membrane distillation form is an internal pressure vacuum membrane distillation.
[0066] In the operation steps, what is different from Example 1 is: the pH of the high-salt ammonia nitrogen wastewater 15 is adjusted to 5; the adjusted high-salt ammonia nitrogen wastewater is heated to 70°C in the membrane distillation heating pool; when the membrane distillation heating pool 9 When the conductivity of...
Embodiment 3
[0071] For a schematic diagram of the process, see figure 1 , the schematic diagram of the device is shown in figure 2 . The water quality characteristics of high-salt ammonia nitrogen wastewater 15 in the figure are: wastewater pH 5, conductance 50mS / cm, COD cr 80mg / L, SS500mg / L, Ca 2+ 30mg / L, Cu200mg / L, Zn50mg / L, NH 4 -N500mg / L. Forward osmosis raw water 1 is a whey protein solution with a mass concentration of 5%.
[0072] The forward osmosis membrane module used is a cellulose acetate plate-and-frame membrane module; the membrane distillation module used is a polypropylene (PP) hollow fiber hydrophobic membrane module with a membrane pore size of 0.2 μm, and the membrane distillation form is an internal pressure vacuum membrane distillation.
[0073] In the operation steps, the difference from Example 1 is: the pH of the high-salt ammonia nitrogen wastewater 15 is adjusted to 4; the adjusted high-salt ammonia nitrogen wastewater is heated to 70°C in the membrane dist...
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