A kind of method of ammonia nitrogen wastewater transformation deamination
A technology for ammonia nitrogen wastewater and deamination, which is applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve the problems of large alkali consumption and difficulty in further reducing the cost of deammonization, so as to reduce the consumption of alkali, The effect of simple operation and simple process
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Embodiment 1
[0025] Take the pH value of 8.1 containing NH 4 Cl 51.7g / L cobalt chloride ammonia decomposed liquid 3m 3 , first adjust the pH to 3.5 with hydrochloric acid, then add calcium carbonate powder with a particle size of 180 mesh with stirring at a liquid-solid ratio of 1:0.5 mL / g, deaminate at 85 °C under normal pressure for ~0.5h, the bubbles in the solution are significantly reduced, vacuum, - 0.005Mpa deamination under reduced pressure for 0.25h, forcing the decomposition and volatilization of the residual ammonium carbonate, filtering to obtain the ammonia nitrogen content of 14mg / L after deamination and the deamination residue (unreacted calcium carbonate), the deamination rate is 99.92%, The volatilized ammonia-containing gas is successively washed with lime milk and ammonia water, and then sent to the cobalt chloride decomposition system, and the obtained deamination residue is returned to continue to be used as a deamination agent. Realize the recycling of hydrochloric a...
Embodiment 2
[0027] Take 2.5m of acid ammonium salt vanadium precipitation wastewater with pH 2.1 3 , which contains Na + 19.3g / L, NH 4 + 8.6g / L, SO 4 2- 85.1g / L, add calcium carbonate powder with a particle size of 320 mesh with stirring according to the liquid-solid ratio of 1:0.2mL / g, and maintain the pH of the solution to 4 with sulfuric acid, deaminate at 97°C at atmospheric pressure, and use sulfuric acid for the volatilized ammonia-containing gas first. Absorb and produce ammonium sulfate, and then absorb calcium carbonate with lime milk, the obtained ammonium sulfate is returned to the ammonium salt vanadium precipitation process for recycling, and the generated calcium carbonate is used as a deamination agent. The calcium carbonate to be added reacts for ~0.5h, and bubbles in the solution After the reduction is obvious, the tail gas after absorption of sulfuric acid is blown into the slurry of the deamination tank, and the CO 2 The special spillover effect of ammonia forces t...
Embodiment 3
[0029] Take 0.5m of ammonium nitrate-containing wastewater with a pH of 3.7 3 , where NH 4 + 3.8g / L, add calcium carbonate powder with a particle size of 250 meshes under stirring at a liquid-solid ratio of 1:0.1mL / g, and maintain the pH of the solution to 4.5 with nitric acid, deaminate at 91°C at atmospheric pressure, and the volatilized ammonia-containing gas is directly condensed to obtain Ammonium carbonate crystals, the bubbles in the solution are significantly reduced after 25 minutes, at this time, add an appropriate amount of calcium bicarbonate, the amount of calcium bicarbonate is about 1 / 20 of the amount of calcium carbonate, and the CO generated by its decomposition is used 2 The ammonia remaining in the solution was cleaned up, and the ammonia nitrogen content was 15mg / L after deamination and the deamination slag, and the ammonia removal rate was 99.61%, and the obtained deamination slag (unreacted calcium carbonate and calcium bicarbonate) ) return to continue...
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