Method for reclaiming nitrogen and phosphorus in nitrogen and phosphorus-containing wastewater by using bittern as magnesium source
A technology of nitrogen, phosphorus and brine, which is applied in the field of treatment and utilization of wastewater rich in nitrogen and phosphorus, and can solve the problems of high price and restrictions on the popularization and application of struvite precipitation method
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Embodiment 1
[0010] Take NH 4 + 、PO 4 3- , Mg 2+ and Ca 2+ Concentrations are 200mg / L, 120mg / L, 60mg / L and 50mg / L respectively, the initial pH value is 7 livestock and poultry breeding wastewater, adjust the pH value to 8.5, fully stir, then add the brine that is 0.5% by volume, drop Add NaOH solution, control the reaction pH value to 8.5 and the reaction time for 30 minutes, let it stand for 60 minutes, pour off the supernatant, and then dry the precipitate at a constant temperature at 25 ° C. The recovery rate of phosphorus is 98% and the recovery rate of nitrogen is 30%. %.
Embodiment 2
[0012] Take NH 4 + 、PO 4 3- , Mg 2+ and Ca 2+ Concentrations are 200mg / L, 120mg / L, 60mg / L and 50mg / L respectively, the initial pH value is 7 livestock and poultry breeding wastewater, adjust the pH value to 9.5, fully stir, then add the brine that is 0.5% by volume, drop Add NaOH solution, control the reaction pH value to 9.5 and the reaction time for 30 minutes, let it stand for 60 minutes, pour off the supernatant, and then dry the precipitate at a constant temperature at 25°C. After testing, the recovery rate of phosphorus is 99%, and the recovery rate of nitrogen is 30%. %.
Embodiment 3
[0014] Take NH 4 + 、PO 4 3- , Mg 2+ and Ca 2+ Concentrations are 200mg / L, 120mg / L, 60mg / L and 50mg / L respectively, and the initial pH value is 7 livestock and poultry breeding wastewater, adjust the pH value to 9.5, fully stir, then add the brine with a volume ratio of 1%, drop Add NaOH solution, control the reaction pH value to 9.5 and the reaction time for 40 minutes, let it stand for 60 minutes, pour off the supernatant, and then dry the precipitate at a constant temperature at 25 ° C. After testing, the recovery rate of phosphorus is 99%, and the recovery rate of nitrogen is 30%. %.
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