US 12,103,871 B2
Enhanced inorganic coagulants for wastewater treatment
William Henderson, Midlothian, VA (US); Vladimir Djukanovic, Glen Allen, VA (US); and Nicholas Seymour, Glen Allen, VA (US)
Assigned to CHEMTREAT, INC., Glen Allen, VA (US)
Appl. No. 16/628,623
Filed by CHEMTREAT, INC, Glen Allen, VA (US)
PCT Filed Jul. 3, 2018, PCT No. PCT/US2018/040794
§ 371(c)(1), (2) Date Jan. 3, 2020,
PCT Pub. No. WO2019/010227, PCT Pub. Date Jan. 10, 2019.
Claims priority of provisional application 62/529,938, filed on Jul. 7, 2017.
Prior Publication US 2020/0156968 A1, May 21, 2020
Int. Cl. C02F 1/52 (2023.01); C02F 1/66 (2023.01); C02F 101/10 (2006.01); C02F 101/14 (2006.01)
CPC C02F 1/5209 (2013.01) [C02F 1/5245 (2013.01); C02F 1/66 (2013.01); C02F 2101/103 (2013.01); C02F 2101/105 (2013.01); C02F 2101/106 (2013.01); C02F 2101/14 (2013.01); C02F 2209/06 (2013.01); C02F 2209/07 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A method of treating water containing phosphate in an amount of 2 ppm to 1,000 ppm to remove the phosphate, the method comprising:
determining the pH and/or alkalinity of the water;
controlling the pH of the water to be within a target range of 5 to 7.0,
adding to the water at least one rare earth metal salt and at least one coagulant in a weight ratio, (rare earth metal salt/(the rare earth metal salt+the at least one coagulant)), that is in a range of 0.6 to 0.9, the coagulant being selected from the group consisting of ferric sulfate, ferric chloride, potassium aluminum sulfate (Alum), aluminum chloride, aluminum sulfate, polyaluminum chloride, aluminum chlorohydrate, calcium chloride, magnesium chloride, bentonite clay, modified starches, tannins, and lignins; and
then removing the phosphate from the water, wherein (i) the target range is selected and (ii) an amount of the rare earth metal salt and the coagulant are added, so that at least 50 wt. % of the phosphate is removed from the water.