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6

Normal operation refers to the routine operating sequence of a system and includes the 
filtration and flushing steps. At initial startup, the UF membranes are flushed for 3hrs to 
remove any residual chemicals. 

This is done by manually adjusting the timer box settings to extend flushing time. The 
flush process does not make filtrate. 

After the start up forward flush is done, the UF membrane can be placed in the 
filtration mode by manually adjusting the timer settings.

A filtration cycle ranges from 6 to 30 minutes and while in operation, all the feed 
water is converted into a filtrate. As contaminants are removed during the filtration 
mode,  the  trans-membrane  pressure  (TMP)  increases  (difference  in  pressure 
between the feed and the filtrate line). 

At the end of the set filtration cycle time, a flushing (cleaning) sequence will be 
triggered automatically for the flush duration set and the process is routine and 
repetitive during normal operation.

Fig 4: UF Membrane Flushing

Flushing

Ÿ

Inlet solenoid valves closed| Flush Solenoid Valve 
Open | Drain solenoid valve open

Ÿ

Settable timer settings - 30 Secs*

Ÿ

Flush tank filtrate water level falling

Pump 

Controller

To Drain

Solenoid

 Inlet

Valve

Feed

120 Microns

Strainder

Solenoid

 Flush

Valve

Flush

CIP

Tank

100LT

Drain

Solenoid

Drain
Valve

FILTRATE

Dayliff UF Membrane

Summary of Contents for BUF 4

Page 1: ...Installation Operating Manual BUF 4 Ultrafiltration Treatment Plant...

Page 2: ......

Page 3: ...2 1 Equipment Speci cation 4 2 2 Module Description 4 3 OPERATION 5 3 1 Pre Treatment 5 3 2 Filtration Flushing Process 5 3 3 Start Up Start Up Pre Checks 8 3 4 Module Flushing 8 3 5 Shutdown 8 4 1 C...

Page 4: ...treatment of groundwater with high TDS levels Standard models are suitable for low turbidity up to 15NTU raw water applications Systems are frame mounted and supplied as complete units with all neces...

Page 5: ...ut frequent operational intervention Due to the efficiency of the membranes it also offers considerable savings over conventional systems and is the ideal solution where potable water is required OPER...

Page 6: ...membrane expressed in microns BUF4 membranes have a 100K pore size Different membrane materials with the same nominal MWCO may have differing particle rejection Pore size distribution and uniformity r...

Page 7: ...nt operation including normal filtration and flushing cycle High efficiency single Dayliff feed backwash Cleaning pump saving energy i e Low CAPEX and OPEX Integrated automated backwash flushing clean...

Page 8: ...UF system which must be frequently cleaned at least once a day depending on the quality of water A variety of technologies can be used such as self cleaning screens and bag cartridge or disc filters D...

Page 9: ...ater is converted into a filtrate As contaminants are removed during the filtration mode the trans membrane pressure TMP increases difference in pressure between the feed and the filtrate line At the...

Page 10: ...lush Valve Flush CIP Tank 100LT Drain Solenoid Drain Valve FILTRATE Dayliff UF Membrane The Clean in Place CIP is performed by circulating CIP chemicals until UF membrane recovers operating flow and p...

Page 11: ...er operation of float valve in the Flush CIP tank 9 Confirm filtrate water quality is okay 10 Confirm dry running protection by closing and opening the raw water source 3 4 Module Flushing The Ultrafi...

Page 12: ...in pH The process operating parameters for the cleaning steps are provided in table below Summary of Cleaning Process Flushing Frequency Once every 20 to 60 minutes water source or pilot test reaults...

Page 13: ...he system skids just prior to start up If the UF membrane is exposed to air for an extended period of time the membrane may become dry and at risk to irreversible damage and therefore it is important...

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Page 15: ...ctrical Issues Check to ensure that there are no electrical fuses blown or breakers tripped and that all electrical connections are secure Use a voltmeter to verify that the pump motor is getting suff...

Page 16: ...embrane and examine the interconnector O rings to ensure they are in position and free of cuts and debris Defective Or Oxidized Membrane If the membrane has been exposed to certain solvents or oxidant...

Page 17: ...lity Instruments malfunction Keep instruments calibrated Cross check values with handheld devices or off line laboratory equipment Membrane Abrasion Check pre filters debris in pipes examine membrane...

Page 18: ...liability implied by law the liability of Dayliff in respect of any defect or failure of equipment supplied is limited to making good by replacement or repair at the Company s discretion defects which...

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Page 21: ...INS499A 11 22 www davisandshirtliff com...

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