Process for reclaiming ammonia-contained sewage

A recovery method and waste water technology, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problem of inability to use catalysts to treat ammonia-containing wastewater, large limitations, no recycling and Issues such as reuse value

A recovery method and waste water technology, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problem of inability to use catalysts to treat ammonia-containing wastewater, large limitations, no recycling and Issues such as reuse value

CN1123543CInactive Publication Date: 2003-10-08CHINA PETROCHEMICAL CORP +1
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  • Process for reclaiming ammonia-contained sewage
  • Process for reclaiming ammonia-contained sewage

Examples

Experimental program
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Effect test

Embodiment 1

[0023] according to figure 1 In the process shown, the reverse osmosis device adopts cellulose acetate membrane, and the dilute ammonia / ammonium-containing wastewater is concentrated by two-stage reverse osmosis. The influent of the reverse osmosis stage, the average water permeability of the first and second stage reverse osmosis are respectively 95l / m 2 h, 110l / m 2 h, the average salt penetration rates are 95% and 98% respectively. The stripping device is a sieve plate column with a theoretical plate number of 13, and the stripping medium is steam at atmospheric pressure.

[0024] Dilute ammonium-containing wastewater: ammonium-containing wastewater (composed of NH 4 Cl: 0.48%, Na + : 1086μg / g, pH6.0) is pumped into the reverse osmosis device, the operating temperature is 35°C, the membrane inlet pressure is 3.7MPa, and the membrane outlet pressure is 3.3MPa. Obtained concentrate: concentration ratio 18.5%, NH 4 Cl2.50%, Na + 5640μg / g; membrane permeate: NH 4 + 3 μg...

Embodiment 2

[0027] according to figure 1 As shown in the process, the reverse osmosis device adopts polysulfone membrane, and the dilute ammonia / ammonium-containing wastewater is concentrated by three-stage reverse osmosis. Water, the concentrated solution of the 3rd stage and 2nd stage reverse osmosis flows back to the feed water of the 2nd stage and 1st stage reverse osmosis respectively, and the average water permeability of the 1st, 2nd, and 3rd stage reverse osmosis is respectively 92l / m 2 h, 104l / m 2 h, 114l / m 2 h, the average salt penetration rate is 95%, 97%, 99%. The stripping device is a sieve tray column with a theoretical plate number of 13, and the stripping medium is steam.

[0028] Dilute ammonium-containing wastewater: ammonium-containing wastewater (composed of NH 4 NO 3 : 0.43%, Na + : 986μg / g, pH4) pumped into the reverse osmosis device, the operating temperature is 45°C, the membrane inlet pressure is 3.7MPa, and the membrane outlet pressure is 3.4MPa. Obtained ...

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Abstract

A process for treating and recovering the ammonia / ammonium contained waste water generated in preparing catalyst includes reverse-osmosis concentration of the said waste with low ammonia content, direct use of the resultant liquid or partial use of it as the ammonia vapour absorbing liquid in stripping tower, mixing the concentrated liquid with the high-concentration the said waste water, adding alkali to regulate pH value, loading in stripping tower to recover ammonia from tower top and discharging the clean water. Its advantages include low energy and chemical consumption, and high recovery rate.

Description

technical field [0001] The invention relates to a method for treating and recovering ammonia / ammonium-containing process wastewater, especially for the treatment method of ammonia / ammonium-containing process wastewater generated in the catalyst preparation process, especially for the preparation process of oil refinery catalysts. A treatment and recovery method for ammonia / ammonium-containing process wastewater discharged from colloidal ammonium exchange and washing. Background technique [0002] Most of the oil refining catalysts are made of certain chemicals containing aluminum and silicon as raw materials, such as water glass, aluminum sulfate, aluminum hydroxide, aluminum silicate, etc., which are synthesized into NaY colloid or NaY molecular sieve through gelation and crystallization, and then passed through Na is exchanged by ammonium exchange or rare earth ammonium exchange process, etc. + ions, and wash out Na with chemically purified water (deionized water) + ions...

Claims

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Application Information

Patent Timeline
08 Oct 2003
Publication
CN1123543C
IPC
C02F9/04
Inventors
郭宏山; 韩建华