	US 11,685,674 B2
	Water treatment
Andrew Cannon, High Wycombe (GB); and William Jeal, High Wycombe (GB)
Assigned to VEOLIA WATER SOLUTIONS & TECHNOLOGIES SUPPORT, SAS, Saint Maurice (FR)
Appl. No. 16/484,932
Filed by VEOLIA WATER SOLUTIONS & TECHNOLOGIES SUPPORT, SAS, Saint Maurice (FR)
PCT Filed Feb. 9, 2018, PCT No. PCT/GB2018/050372 § 371(c)(1), (2) Date Aug. 9, 2019, PCT Pub. No. WO2018/146488, PCT Pub. Date Aug. 16, 2018.
Claims priority of application No. 1702272 (GB), filed on Feb. 10, 2017.
Prior Publication US 2019/0382295 A1, Dec. 19, 2019
Int. Cl. C02F 3/00 (2023.01); C02F 3/08 (2023.01); C02F 3/20 (2023.01); C12M 1/12 (2006.01)

CPC C02F 3/006 (2013.01) [C02F 3/085 (2013.01); C02F 3/20 (2013.01); C12M 1/12 (2013.01); C12M 25/20 (2013.01); C02F 2209/14 (2013.01); C02F 2209/22 (2013.01); C02F 2209/44 (2013.01)]

16 Claims

1. A water treatment apparatus, the apparatus comprising a fluid inlet, a first MBBR and a second MBBR and a fluid outlet, and a controller, each of the first MBBR and the second MBBR having an air blower for aerating the contents of said MBBR configured to generate a dissolved oxygen level of 3 mg/L or greater, wherein the first MBBR and second MBBR are connected in series such that water to be treated flows from the inlet through the first MBBR to the second MBBR and thence to the outlet and wherein the controller is operable to change the flow direction such that water to be treated flows from the inlet to the second MBBR then to the first MBBR and thence to the outlet, wherein the apparatus comprises an ammonia sensor to determine the level of ammonia upstream and/or downstream thereof and wherein the controller is operable to reverse the flow through the first and second MBBRs depending on ammonia concentration, load or flux determined by the ammonia sensor.