| CPC C02F 1/46176 (2013.01) [C02F 1/001 (2013.01); C02F 1/4676 (2013.01); C02F 1/5254 (2013.01); C02F 1/586 (2013.01); C02F 1/66 (2013.01); C25B 1/00 (2013.01); C25B 1/20 (2013.01); C25B 1/50 (2021.01); C25B 9/65 (2021.01); C02F 2001/46119 (2013.01); C02F 2001/46133 (2013.01); C02F 2101/105 (2013.01); C02F 2101/16 (2013.01); C02F 2101/20 (2013.01); C02F 2209/06 (2013.01)] | 18 Claims |
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1. A system for removal of nitrogen and phosphorus from starting material water, the system comprising:
an elevated pH phosphorus removal stage configured to raise pH of the starting material water from less than 7.5 to greater than or equal to 7.5 via addition of one or more bases thereto in a mixing tank to precipitate a phosphorus salt from the starting material water and configured to remove the precipitated phosphorus salt from the starting material water, to form water from the elevated pH phosphorus removal stage;
an electrolytic nitrogen removal stage comprising an electrolytic cell configured to contact the water from the elevated pH phosphorus removal stage with the electrolytic cell to remove nitrogen therefrom as nitrogen gas, to form water from the electrolytic nitrogen removal stage; and
a galvanic phosphorus removal stage configured to contact the water from the electrolytic nitrogen removal stage with a galvanic cell to form a precipitate comprising a salt that comprises phosphorus, wherein the galvanic phosphorus removal stage is configured to separate the salt comprising the phosphorus from the treated water to form water from the galvanic phosphorus removal stage, wherein the galvanic cell comprises
an anode comprising Al, or a combination thereof,
a cathode having a different composition than the anode, the cathode comprising Cu, and
a conductive connector that electrically and physically connects the anode and the cathode, the conductive connector comprising Cu, Zn, Fe, Cd, Ni, Sn, Pb, or a combination thereof, wherein the conductive connector comprises a screw, a bolt, or a combination thereof;
wherein the water from the galvanic phosphorus removal stage has a lower phosphorus concentration and a lower nitrogen concentration than the starting material water.
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