TTP – RO SYSTEMTTP – RO SYSTEM

G. SRINIVASANG. SRINIVASANVA TECH WABAGVA TECH WABAG

PROCESS DESCRIPTIONPROCESS DESCRIPTION

The treatment process adopted is of The treatment process adopted is of three stages to meet the design quality three stages to meet the design quality and quantity parameters of the final and quantity parameters of the final treated water leaving TTP.treated water leaving TTP.

PRE TREATMENT PRE TREATMENT Collection of waste water in feed collection tank Collection of waste water in feed collection tank

followed by clarification, dual media filtration and fine followed by clarification, dual media filtration and fine tuning in basket strainers before entering to the next tuning in basket strainers before entering to the next phase of the treatment. In the clarifier, phase of the treatment. In the clarifier, BOD/COD/SILICA/SUSPENDED SOLIDS are partially BOD/COD/SILICA/SUSPENDED SOLIDS are partially removed. The remaining suspended solids are removed. The remaining suspended solids are removed in dual media (Sand and Anthracite) removed in dual media (Sand and Anthracite) pressurized filters. Any escaped fine particles are pressurized filters. Any escaped fine particles are entrapped in basket strainers which acts as a safety entrapped in basket strainers which acts as a safety mechanism in case the bottom distribution system fails.mechanism in case the bottom distribution system fails.

ULTRAFILTRATION SYSTEMULTRAFILTRATION SYSTEM

Ultrafiltration is a membrane process in which a porous Ultrafiltration is a membrane process in which a porous membrane is used to separate or reject colloidal and membrane is used to separate or reject colloidal and particulate matter. Similar to other membrane process, particulate matter. Similar to other membrane process, Ultrafiltration is a pressure driven process. High Ultrafiltration is a pressure driven process. High permeability of ultrafiltration membrane and negligible permeability of ultrafiltration membrane and negligible osmotic effects allow the ultrafiltration process to osmotic effects allow the ultrafiltration process to operate at relatively low pressures. In UF, the operate at relatively low pressures. In UF, the remaining BOD/COD/SILICA/ SS/ OIL/GREASE are remaining BOD/COD/SILICA/ SS/ OIL/GREASE are removed and the permeate is fed to Reverse osmosis removed and the permeate is fed to Reverse osmosis system.system.

REVERSE OSMOSIS REVERSE OSMOSIS SYSTEM SYSTEM

The permeate from UF is fed into the system through 5 The permeate from UF is fed into the system through 5 micron cartridge filters. Before entering RO skids micron cartridge filters. Before entering RO skids chemical like anti scalant /HCl/ SMBS is dozed in order chemical like anti scalant /HCl/ SMBS is dozed in order to conditioning any scaling, pH control and oxidizing to conditioning any scaling, pH control and oxidizing elements present in the the UF permeate water The elements present in the the UF permeate water The treated RO permeate goes to Degasser towers where treated RO permeate goes to Degasser towers where the carbonic acid present in the water splits in to CO2 the carbonic acid present in the water splits in to CO2 gas and Water. CO2 gas escapes from the top of the gas and Water. CO2 gas escapes from the top of the degasser tower and the water is collected in the degasser tower and the water is collected in the Degassed Water storage Tank.Degassed Water storage Tank.

MIXED BED EXCHANGERMIXED BED EXCHANGER MB unit has both Strong Acid Cation Resin and Strong MB unit has both Strong Acid Cation Resin and Strong

Base Anion resin mixed in a single vessel. The Base Anion resin mixed in a single vessel. The regeneration of these resins is carried out in regeneration of these resins is carried out in simultaneous regeneration, i.e. cation by Hydrochloric simultaneous regeneration, i.e. cation by Hydrochloric Acid in countercurrent and anion by caustic in co-Acid in countercurrent and anion by caustic in co-current. The MB bed exchanger functions as multiple current. The MB bed exchanger functions as multiple cycles of cation and anion exchanges and thus cycles of cation and anion exchanges and thus polishes the water to best extent possible. This unit polishes the water to best extent possible. This unit ensures consistent quality of DM water with a pH 7 ± ensures consistent quality of DM water with a pH 7 ± 0.2.0.2.

SLUDGE HANDLING AND SLUDGE HANDLING AND DISPOSAL SYSTEM.DISPOSAL SYSTEM.

The clarifier sludge is removed from the bottom of clarifier into the The clarifier sludge is removed from the bottom of clarifier into the sludge sump. This sludge has around 6% consistency and is sludge sump. This sludge has around 6% consistency and is further pumped into the sludge centrifuge with the help of pumps. further pumped into the sludge centrifuge with the help of pumps. The dewatering polyelectrolyte is added into the sludge for The dewatering polyelectrolyte is added into the sludge for enhancing the performance of centrifuge. Two centrifuges are enhancing the performance of centrifuge. Two centrifuges are provided for the purpose ( one working and one standby ). The provided for the purpose ( one working and one standby ). The centrifuges are located on first floor of chemical house. The centrifuges are located on first floor of chemical house. The sludge produced is dumped on ground floor directly in the trolley sludge produced is dumped on ground floor directly in the trolley ( provided by others). This trolley is taken away for disposal of ( provided by others). This trolley is taken away for disposal of sludge. The centrifuge is designed for sixteen hours operation as sludge. The centrifuge is designed for sixteen hours operation as lot of time is required for removal and setting of fresh trolleys lot of time is required for removal and setting of fresh trolleys

CHEMICAL DOSING CHEMICAL DOSING Chlorination.Chlorination. Two numbers solution feed V-notch vacuum eductor Two numbers solution feed V-notch vacuum eductor

type chlorinators are provided for chlorination of clarified type chlorinators are provided for chlorination of clarified water. The operating chlorinator shall withdraw chlorine water. The operating chlorinator shall withdraw chlorine gas from dedicated working chlorine tonne container gas from dedicated working chlorine tonne container with the help of vaccum regulator mounted on tonner. with the help of vaccum regulator mounted on tonner. Also one standby chlorine container shall be provided. Also one standby chlorine container shall be provided. The clarified water is chlorinated with the help of these The clarified water is chlorinated with the help of these tonner mounted chlorine tonner. Two ( one working and tonner mounted chlorine tonner. Two ( one working and one standby ) chlorinators are provided for the purpose.one standby ) chlorinators are provided for the purpose.

Dolomite Lime Dosing Dolomite Lime Dosing system system

The lime dosing system is complete with The lime dosing system is complete with automatic dolomite lime handling and feed automatic dolomite lime handling and feed system, dosing tanks, etc.Two tanks with 4 hrs system, dosing tanks, etc.Two tanks with 4 hrs retention time are provided for the same. Two retention time are provided for the same. Two dosing pumps provided are of centrifugal type dosing pumps provided are of centrifugal type and flow meter is provided for quantity and flow meter is provided for quantity measurement. The flow is controlled with the measurement. The flow is controlled with the help of VFD provided for these pumps help of VFD provided for these pumps

Other Dosing SystemsOther Dosing Systems All the dosing tanks are provided with level All the dosing tanks are provided with level

switches for low level trip i.e. pump safety. The switches for low level trip i.e. pump safety. The pumps are provided with common external pumps are provided with common external pressure relief valvespressure relief valves. . The chemical The chemical preparation is manual i.e. addition of preparation is manual i.e. addition of chemicals is done manually. The required chemicals is done manually. The required amount of chemicals are added to achieved amount of chemicals are added to achieved required concentration. required concentration.

Other chemicals usedOther chemicals used Ferric Chloride Dosing System.Ferric Chloride Dosing System. Coagulant-aid Dosing system.Coagulant-aid Dosing system. Sodium bi sulphite dosing system.Sodium bi sulphite dosing system. Acid dosing system.Acid dosing system. Antiscalant Dosing System.Antiscalant Dosing System. Dewatering Polyelectrolyte dosing Dewatering Polyelectrolyte dosing

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