# US 10,479,709 B2 · Water treatment system and method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,479,709 B2 - Document ID: US10479709B2 - Status: Granted - Kind: B2 - Application number: 15/520,586 - Filed: 2015-10-20 - Published: 2017-11-02 - Granted: 2019-11-19 - Earliest claimed: 2014-10-20 - Assignees: Bionest Technologies Inc. - Applicants: Bionest Technologies Inc. - Inventors: Etienne Boutet; Serge Baillargeon; Garfield R. Lord - Web page: https://patentgrep.com/patent/US10479709B2 ## CPC - C02F 3/06: using submerged filters - C02F 3/006: {Regulation methods for biological treatment} - C02F 3/10: Packings; Fillings; Grids (packing elements in general B01J19/30, B01J19/32) - C02F 3/101: {Arranged-type packing, e.g. stacks, arrays} - C02F 3/109: {Characterized by the shape (C02F3/104 takes precedence)} - C02F 3/121: {Multistep treatment} - C02F 3/1247: {comprising circular tanks with elements, e.g. decanters, aeration basins, in the form of segments, crowns or sectors} - C02F 3/1257: {Oxidation ditches} - C02F 3/20: using diffusers - C02F 3/301: {Aerobic and anaerobic treatment in the same reactor} - C02F 3/303: {characterised by the nitrification} - C02F 3/308: {Biological phosphorus removal} - C02F 7/00: Aeration of stretches of water - C02F 2101/16: Nitrogen compounds, e.g. ammonia - C02F 2201/007: Modular design - C02F 2203/006: details of construction, e.g. specially adapted seals, modules, connections - C02F 2203/008: Mobile apparatus and plants, e.g. mounted on a vehicle - C02F 2209/04: Oxidation reduction potential [ORP] - C02F 2209/08: Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD] - C02F 2209/38: Gas flow rate - C02F 2209/40: Liquid flow rate - Y02W 10/10: Biological treatment of water, waste water, or sewage - Y02W 10/37: using solar energy - C02F: TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE (separation in general B01D; special arrangements on waterborne vessels of installations for treating water, waste water or sewage, e.g. for producing fresh water, B63J; adding materials to water to prevent corrosion C23F; treating radioactively-contaminated liquids G21F9/04; regeneration of reactants for recirculation into processes, see the relevant places for the processes) - Y02W: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT ## Abstract A water treatment system comprising a first reactor and a second reactor arranged to be placed in series in a body of water, the first and/or second reactor comprising at least one cell for housing biomedia. A mid-settling zone is provided between the first and second reactors for separating solids in the water. A method of treating water, the method comprising passing water to be treated through a first reactor and then a second reactor arranged in series in a body of water, the first and/or second reactors comprising at least one cell for housing biomedia, wherein the water is passed through a mid-settling zone between the first and second reactors before passing through the second reactor. ## Claims ### Claim 1 A water treatment system comprising: a first reactor and a second reactor arranged to be placed in series in a body of water between an inlet of the body of water and an outlet of the body of water, at least one of the first and second reactor comprising at least one cell for housing biomedia, at least one baffle extending from at least one of the first reactor and the second reactor for preventing water flow around the at least one of the first reactor and the second reactor, and a mid-settling zone between the first reactor and the second reactor for separating solids in the water. ### Claim 2 (depends on 1) The water treatment system of claim 1, further comprising one or more of an inlet settling zone upstream of the first reactor and an outlet settling zone downstream of the second reactor. ### Claim 3 (depends on 1) The water treatment system of claim 1, wherein the first reactor is adapted to operate at a loading rate of about 2.0 to about 6.0 g of soluble carbonaceous biochemical oxygen demand per effective surface area of biomedia per day (g sCBOD5/m2·d). ### Claim 4 (depends on 1) The water treatment system of claim 1, wherein the second reactor is adapted to operate at a loading rate of about 0.5 to about 1.5 g of soluble carbonaceous biochemical oxygen demand per effective surface area of biomedia per day (g sCBOD5/m2·d). ### Claim 5 (depends on 1) The water treatment system of claim 1, wherein the second reactor is arranged to operate at about 30-70% lower than the loading rate of the first reactor. ### Claim 6 (depends on 1) The water treatment system of claim 1, wherein the at least one baffle is positioned across a flow path in the body of water for directing the water through the first and/or the second reactor. ### Claim 7 (depends on 1) The water treatment system of claim 1, further comprising an inlet settling zone upstream of the first reactor, the inlet settling zone having a hydraulic retention time of about 1.0 to about 3.0 days. ### Claim 8 (depends on 1) The water treatment system of claim 1, further comprising an outlet settling zone downstream of the second reactor, a hydraulic retention time of the outlet settling zone being about 0.5 to about 1.5 days. ### Claim 9 (depends on 1) The water treatment system of claim 1, wherein the mid-settling zone between the first and second reactors has a hydraulic retention time of about 1.0 to about 4.0 days. ### Claim 10 (depends on 1) The water treatment system of claim 1, wherein the mid-settling zone between the first and second reactors has an overflow rate of about 0.5 to about 2.0 m3/m2·d. ### Claim 11 (depends on 1) The water treatment system of claim 1, wherein the body of water is a lagoon. ### Claim 12 (depends on 1) The water treatment system of claim 1, further comprising a filter at the outlet of the body of water. ### Claim 13 (depends on 1) The water treatment system of claim 1, wherein at least one of the first and/or second reactor comprise a plurality of cells arranged as an array, and the first and/or the second reactor are adapted to float in the body of water, each cell having a plurality of cell units extending vertically into the water in use, each cell unit being arranged to house the biomeda. ### Claim 14 The water treatment system of 13, wherein the first and/or second reactor is modular, at least one of the plurality of cell units being removeably attachable. ### Claim 15 (depends on 1) The water treatment system of claim 1, further comprising biomedia housed within the at least one cell of the first and/or the second reactor, the biomedia comprising an unattached elongate thin film having a nest-like configuration in use and configured to be self-supporting within the water. ### Claim 16 (depends on 1) The water treatment system of claim 1, wherein a hydraulic retention time of the system is less than 15 days or less than 10 days. ### Claim 17 (depends on 1) The system of claim 1, further comprising a filter at the outlet of the body of water, wherein the filter is biomedia having a surface area of about 160 to about 330 m2 per cubic meter. ### Claim 18 (depends on 1) The system of claim 1, wherein the at least one baffle extends from the at least one of the first and the second reactors towards a side of the body of water. ### Claim 19 A water treatment system comprising: a first reactor and a second reactor arranged to be placed in series in a body of water between an inlet of the body of water and an outlet of the body of water, the first and/or second reactor arranged to house biomedia, a settling zone between the first reactor and the second reactor, at least one baffle positioned across a flow path in the body of water and around at least one of the first reactor and the second reactor for directing water through the at least one of the first reactor and the second reactor, and for providing a water treatment chain from the inlet to the outlet, through the first reactor, the settling zone, and the second reactor, without recirculation of the water. ### Claim 20 A water treatment system comprising a first reactor and a second reactor arranged to be placed in series in a body of water between an inlet of the body of water and an outlet of the body of water, the first and/or second reactor arranged to house biomedia, a mid-settling zone between the first and second reactors for separating solids in the water, the system arranged to form a water treatment chain from the inlet to the outlet through the first reactor, the mid-settling zone, and the second reactor without recirculation of the water, the first and/or second reactor being adapted to float in the body of water, and the biomedia having a surface area of about 160 to about 330 m2 per cubic meter.