Treatment method of catalyst production wastewater
A technology for producing wastewater and treatment methods, which is applied in water/sewage treatment, natural water treatment, chemical instruments and methods, etc. It can solve the problems of only obtaining mixed salt crystals, high and low cost of wastewater treatment, and reduce circulation. Effect of liquid volume, increasing concentration factor and evaporation efficiency
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Embodiment 1
[0122] Such as figure 1 As shown, the catalyst production wastewater (containing NaCl 60g / L, Na 2 SO 4 70g / L, NH 4 Cl18g / L, (NH 4 ) 2 SO 4 21.34g / L, pH 6.7) with a feed rate of 10m 3 The speed of / h is sent into the pipeline of the treatment system, and the aqueous sodium hydroxide solution of 45.16 mass % is introduced into the pipeline to adjust the pH value for the first time, and mixed with the second mother liquor returned by the ninth circulation pump 79 to obtain waste water to be treated (measured in which Cl - The concentration of SO is 2.286mol / L, SO 4 2- The concentration is 0.627mol / L), the adjusted pH value is monitored by the first pH value measuring device 61 (pH meter) (measured value is 8), and then the waste water to be treated is sent into the second by the first circulation pump 71 The second heat exchange device 32 (heat exchanger made of plastic material) exchanges heat with the first mother liquor to lower the temperature of the wastewater to ...
Embodiment 2
[0133] Carry out the treatment of catalyst production waste water according to the method for embodiment 1, difference is: to containing NaCl40g / L, NaCl40g / L, Na 2 SO 4 100g / L, NH 4 Cl 9g / L, (NH 4 ) 2 SO 4 22.9g / L, pH is 6.4 catalyst production waste water is processed, and the Cl in the waste water to be treated that obtains - The concentration is 1.836mol / L, SO 4 2- The concentration is 0.797mol / L. The temperature of the wastewater to be treated after heat exchange by the second heat exchange device 32 is 5°C.
[0134] The cooling crystallization temperature is -4°C, and the time is 120 minutes; the evaporation conditions are shown in Table 2; the cooling treatment temperature is 25°C, and the time is 60 minutes.
[0135] Table 2
[0136]
[0137] The first solid-liquid separation device 91 obtains 4118.7kg of sodium sulfate decahydrate crystallization filter cake containing water 75.5 mass % per hour, (purity is 98.7 mass %); Obtain 10.778m per hour 3 The con...
Embodiment 3
[0142] Carry out the treatment of catalyst production waste water according to the method for embodiment 1, difference is: to containing NaCl50g / L, NaCl50g / L, Na 2 SO 4 130g / L, NH 4 Cl 5g / L, (NH 4 ) 2 SO 4 13.2g / L, pH is the catalyst production waste water of 6.0 and is processed, and the Cl in the obtained waste water to be treated - The concentration is 1.986mol / L, SO 4 2- The concentration is 0.879mol / L. The temperature of the wastewater to be treated after heat exchange by the second heat exchange device 32 is 10.1°C.
[0143] The cooling crystallization temperature is 0°C, and the time is 150 minutes; the evaporation conditions are as shown in Table 3; the temperature of the cooling treatment is 30°C, and the time is 50 minutes.
[0144] table 3
[0145]
[0146] The first solid-liquid separation device 91 obtains 4959.33kg of sodium sulfate decahydrate crystallization filter cake with a water content of 76% by mass per hour, and the purity is 98.5% by mass;...
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