A method for the treatment and reuse of ammonia-nitrogen-containing high-salt catalyst wastewater
An inorganic catalyst and wastewater technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, neutralized water/sewage treatment, etc., can solve the problems of high salt and ammonia nitrogen discharge not up to standard, so as to reduce pollution and solve discharge Difficulties, to achieve a high degree of recycling effect
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Embodiment 1
[0041] A chemical plant contains ammonia nitrogen and high-salt catalyst wastewater. The main water quality characteristics of the wastewater are: wastewater pH 8.19, conductivity 17.6mS / cm, COD cr 61mg / L, SS 33mg / L, H 2 PO 4 - 116.1mg / L, Cu 5.3mg / L, Zn 2.12mg / L, Na + 3448.1mg / L, Ca 2+ 7.8mg / L, NO 3 - 12105.7mg / L, Cl - 12.7mg / L, NH 4 -N 397.2mg / L. The processing flow is attached figure 1 shown.
[0042] Step 1: Use hydrochloric acid to adjust the pH of the wastewater from 8.19 to about 5, so that most of the ammonia nitrogen in the wastewater is NH + Existence (at 25°C and pH 5, the free ammonia in the liquid phase accounts for 0.0056% of the total ammonia).
[0043] Step 2: Pump the wastewater after acid adjustment into the submerged microfiltration system, and the submerged microfiltration unit adopts the external pressure polyvinylidene fluoride hollow fiber curtain membrane module. The operating conditions are: wastewater pH 5, wastewater temperature abou...
Embodiment 2
[0048] The main water quality characteristics of ammonia nitrogen-containing high-salt catalyst wastewater are the same as in Example 1.
[0049] Step 1: Use hydrochloric acid to adjust the pH of the wastewater from 8.19 to about 6, so that most of the ammonia nitrogen in the wastewater is NH + Existence (at 25°C, at pH 6, free ammonia in the liquid phase accounts for 0.0555% of the total ammonia).
[0050] Step 2: Pump the wastewater after acid adjustment into the submerged microfiltration system, and the submerged microfiltration unit adopts the external pressure polyvinylidene fluoride hollow fiber curtain membrane module. The operating conditions are: wastewater pH 6, wastewater temperature about 20°C, operating pressure about -0.02MPa. Under these operating conditions, the permeation flux of the microfiltration membrane is 60-100L / m 2 h, the turbidity of the product water is lower than 0.2NTU;
[0051] Step 3: Heat the microfiltration product water to a specific temper...
Embodiment 3
[0055] A chemical plant contains ammonia nitrogen and high-salt catalyst wastewater. The main water quality characteristics of the wastewater are: wastewater pH 8.24, conductivity 20.9mS / cm, COD cr 12mg / L, SS 940mg / L, Cu 185mg / L, Zn 45.6mg / L, NO 3 - 12122.6mg / L, PO 4 3- (as P) 0.3mg / L, NH 4 -N 252mg / L. The processing flow is attached figure 1 shown.
[0056] Step 1: Use hydrochloric acid to adjust the pH of the wastewater from 8.24 to about 5.5, so that most of the ammonia nitrogen in the wastewater is NH + exist.
[0057] Step 2: Pump the wastewater after acid adjustment into the submerged microfiltration system, and the submerged microfiltration unit adopts the external pressure polyvinylidene fluoride hollow fiber curtain membrane module. The operating conditions are: wastewater pH 5.5, wastewater temperature about 20°C, operating pressure about -0.02MPa. Under these operating conditions, the permeation flux of the microfiltration membrane is 50-80L / m 2 h, the t...
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