# US 10,913,675 B1 · Industrial wastewater treatment > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,913,675 B1 - Document ID: US10913675B1 - Status: Granted - Kind: B1 - Application number: 16/881,902 - Filed: 2020-05-22 - Granted: 2021-02-09 - Earliest claimed: 2020-05-22 - Assignees: P2W Ltd. - Applicants: P2W Ltd. - Inventors: Ronny Banker; Yael Zeevy Perez - Web page: https://patentgrep.com/patent/US10913675B1 ## CPC - C02F 9/00: Multistage treatment of water, waste water or sewage - C02F 1/442: {by nanofiltration} - C02F 1/444: {by ultrafiltration or microfiltration} - C02F 1/52: by flocculation or precipitation of suspended impurities {(C02F1/463 takes precedence)} - C02F 1/66: by neutralisation; pH adjustment (for degassing C02F1/20; using ion-exchange C02F1/42; for flocculation or precipitation of suspended impurities C02F1/52; for removing dissolved compounds C02F1/58) - C02F 11/122: using filter presses (C02F11/123 takes precedence) - C02F 2101/101: {Sulfur compounds} - C02F 2101/20: Heavy metals or heavy metal compounds - C02F 2101/203: {Iron or iron compound} - C02F 2101/206: {Manganese or manganese compounds} - C02F 2101/22: Chromium or chromium compounds, e.g. chromates - C02F 2103/34: from industrial activities not provided for in groups C02F2103/12 - C02F2103/32 - C02F 2209/005: Processes using a programmable logic controller [PLC] - C02F 2301/046: Recirculation with an external loop - 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) ## Abstract Methods and systems are provided for industrial wastewater treatment that yields zero liquid discharge (ZLD). These include pre-treating provided industrial wastewater to remove heavy metals, ultra-filtering the pre-treated wastewater to remove suspended and colloidal solids, nano-filtering the ultra-filtered wastewater to yield treated water (with monovalent ions) and a concentrate, treating the concentrate to remove di- and tri-valent elements and other compounds from the concentrate, and to reduce a level of sulfates to a specified level which is above a solubility level of sulfates—to yield returned water, and sludge, mixing the returned water with the provided industrial wastewater before or at the first treatment stage and/or with the pre-treated wastewater before the ultrafiltration, and removing residual water from the sludge to yield removed solids with ZLD. Advantageously, disclosed processes and systems are efficient, cheaper and more sustainable than prior art systems. ## Claims ### Claim 1 A method of wastewater treatment that yields zero liquid discharge (ZLD), the method comprising: pre-treating provided industrial wastewater to remove heavy metals and suspended and/or colloidal solids to provide pre-treated wastewater, ultra-filtering the pre-treated wastewater to remove suspended and colloidal solids, nano-filtering the ultra-filtered wastewater to yield treated water and a concentrate, wherein the treated water comprises monovalent ions, treating the concentrate with a fluid bed reactor (FBR) and using calcium, calcium compounds and/or sodium hydroxide in the FBR to remove di- and tri-valent elements and other compounds from the concentrate, to reduce a level of sulfates to a specified level which is above a solubility level of sulfates and to yield returned water, and sludge, utilizing used FBR substrate for the pre-treatment of the provided industrial wastewater, mixing the returned water with the provided industrial wastewater before or at the first treatment stage and/or with the pre-treated wastewater before the ultrafiltration, and removing residual water from the sludge to yield removed solids with ZLD. ### Claim 2 (depends on 1) The method of claim 1, further comprising controlling levels of compounds in the treated water to continuously reiterate the method. ### Claim 3 (depends on 1) The method of claim 1, wherein the specified level of sulfates is between 2,000-5,000 ppm. ### Claim 4 (depends on 1) The method of claim 1, wherein the specified level of sulfates is about a half of a level of sulfates in the provided industrial wastewater. ### Claim 5 (depends on 1) The method of claim 1, further comprising monitoring a level of monovalent ions in the treated water, and reducing the level thereof according to the monitoring. ### Claim 6 A method of wastewater treatment that yields zero liquid discharge (ZLD), the method comprising: pre-treating provided industrial wastewater to remove heavy metals and suspended and/or colloidal solids to provide pre-treated wastewater, ultra-filtering the pre-treated wastewater to remove suspended and colloidal solids, nano-filtering the ultra-filtered wastewater to yield treated water and a concentrate, wherein the treated water comprises monovalent ions, treating the concentrate with a fluid bed reactor (FBR) to remove di- and tri-valent elements and other compounds from the concentrate, to reduce a level of sulfates to a specified level which is above a solubility level of sulfates and to yield returned water, and sludge, utilizing used FBR substrate for the pre-treatment of the provided industrial wastewater, mixing returned water with the provided industrial wastewater before or at the first treatment stage and/or with the pre-treated wastewater before the ultrafiltration, and removing residual water from the sludge to yield removed solids with ZLD. ### Claim 7 (depends on 6) The method of claim 6, further comprising controlling levels of compounds in the treated water to continuously reiterate the method. ### Claim 8 (depends on 6) The method of claim 6, wherein the specified level of sulfates is between 2,000-5,000 ppm. ### Claim 9 (depends on 6) The method of claim 6, wherein the specified level of sulfates is about a half of a level of sulfates in the provided industrial wastewater. ### Claim 10 (depends on 6) The method of claim 6, further comprising monitoring a level of monovalent ions in the treated water, and reducing the level thereof according to the monitoring.