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7

The flushing mode occurs automatically (after manually setting the timer) and is 
used to loosen and wash-out particulates deposited on the hollow fiber of the UF 
membrane. 

It's critical that the flushing time be set long enough to wash-out all dirt until clear 
water is observed. 

The flush time may therefore vary depending on the water quality. Typically, 30sec is 
set as standard flush time but should be changed at site appropriately. 

Fig 5: BUF4 CIP Process

CIP

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

Ÿ

Settable timer settings - 60min* until no pH change

Ÿ

CIP tank chemical recirculating

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

The Clean in Place (CIP) is performed by circulating CIP chemicals until UF membrane 
recovers operating flow and pressure. 

During the CIP process recirculation of the chemical is done until there is no further 
change in the pH of the CIP chemicals which indicate no further chemical reaction is 
ongoing. 

A soak operation can also be included to improve the effectiveness of the cleaning.

Soaking for 1-2hrs allows more time for the chemical to react with contaminants that 
have attached to the membrane surface or penetrated the fiber wall. To soak, once 
the unit is circulating the CIP chemical, power off the unit and close off all ball valves 
to ensure CIP chemical stays within the UF membranes for the soak period. After the 
soak  a  routine  flushing  is  performed  to  remove  any  remaining  particulates  and 
residual chemicals. 

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...

Page 14: ......

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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