Sample Block Flow Diagram: 54% Phosphoric Acid Clarification [PDF]

Controls: The process is controlled with a PLC. There are PID loops for the inlet pressure and Concentrate Flow rate. Co

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Idea Transcript


Sample Block Flow Diagram: 54% Phosphoric Acid Clarification Contaminant Removal by V✧SEP Filtration 85% Recovery

34.9 GPM 0.1% TSS 2.0% H2SO4 0.4% Fluoride 0.7% MgO 0.5% Al2O3 0.4% Fe2O3 304 ppm Si 238 ppm Ca

41 GPM

Feed

3.0% TSS 2.3% H2SO4 1.0% Fluoride 0.8% MgO 0.6% Al2O3 0.4% Fe2O3 894 ppm Si 793 ppm Ca

Process Objectives: 54,000 Gallons per day (Feed) Remove all suspended solids

Permeate

Filter Module Configuration: Membrane: 0.1µm Teflon on Polyester Cleaning Chemical: NLR 202

6.1 GPM 20.0% TSS 4.0% H2SO4 4.4% Fluoride 1.4% MgO 1.2% Al2O3 0.4% Fe2O3 4270 ppm Si 3968 ppm Ca

V✧SEP

Two - 84" V✧SEPs (1300SF) @ 17.7 avg. GFD

V✧SEP Advantages: No Chemical Addition Easy to use and maintain Small Footprint Energy Efficient High % recovery as filtrate

Concentrate

0.1µm Teflon Membrane On or Off

To Drain during flushing

On or Off

Filtrate Holding Tank

On or Off

Metering Pump

Cleaning Tank

Chemical tote

5,000 Gal.

CIP Drain Discharge to Sewer

Controls: The process is controlled with a PLC. There are PID loops for the inlet pressure and Concentrate Flow rate. Concentration is accomplished using VFD's and throrttling valves. The % Recovery is controlled using volumetric calculations. The system initiates upon a signal from the feed tank level sensor. The system will shut down automatically once the feed tank is emptied or the permeate tank is filled, The system will send on spec concentrate to the holding tank. After a system shut down due to low feed tank level, or after any shut down, the system would auto flush using hot water and then go into Standby Mode. On start up after flushing with water, the discharge from the V✧SEP goes to drain for a set time interval until all water has been purged. Then the discharge from the V✧SEP diverts to the appropriate holding tanks. V✧SEPs will automatically clean when a predetermined low permeate flow alarm is reached on any of the units, or at a predetermined timed interval. Spent cleaning chemcials would also discharge to the Chemical Treatment Sewer.

Hot Water (60º-70ºC)

On or Off

To Product Storage Tank

260 Gal. On or Off On or Off

Variable Speed Pump

On or Off 100 Mesh Dual Stage Prescreen

On or Off

P

P

2" Line Feed

FM

Permeate

V✧SEP Concentrate

P

P

2" Line Feed

V✧SEP Concentrate

P FM

Process On or Off

MGA Holding Tank 5,000 Gal.

To Drain during flushing

P FM

Throttling

Throttling

On or Off On or Off

Concentrate Tank 2,000 Gal.

FM

Permeate

Setpoints: %Recovery, Feed Pressure, Low Permeate Alarm, Cleaning Time. Control Options: 1] Density meter for concentrate destination control 2] Separate Cleaning Skid for round robin cleaning and future expansion 3] Metering Pumps for chemical injection of cleaning chemicals 4] Permeate flush tank (to reduce volume of wastewater)

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