operation and maintenance WTP, reverse osmosis, pretreatment

1. Operation & Maintenance

2. Clarifier

3. FAKTOR YG BERPENGARUH PADA PROSES
KOAGULASI DAN FLOKULASI
•COAGULANT YANG DIPAKAI
• TIPE POLYMER/FLOKULAN
• DOSIS BAHAN KIMIA
• pH
• MIXING KOAGULASI/FLOKULASI

4. Chemical Yang diinjeksi ke System
1. Coagulant (PAC / ACH) dosis : based on Jar Tes
2. Flocculant (Polymer), dosis : Based On Jar Tes, Range : 0.1 sd 0.5 ppm

5. Sand & Activated Carbon Filter
 Sand Filter
 To Treatment :
- Turbidity
- Suspended Solid
- Sand / Soil
- Sludge
- etc
 Process :
- Service
- Backwash
- Rinsing
 Activated Carbon Filter
 To Treatment :
- Color
- Odor
- Organic
- Chlorine
- Turbidity
 Process :
- Service
- Backwash
- Rinsing

6. Parameter Operational
 Flowrate
- Selalu catat flowrate air
- Perhatikan perubahan flowrate secara berkala
 Pressure
- Inlet Pressure
- Outlet Pressure
- Catat D Pressure Inlet & Outlet secara berkala
 Turbidity ( ntu )
- Cek & catat nilai Turbidity inlet & outlet secara berkala
 Leakage
- Cek kebocoran

7. Back Wash
Back Wash dilakukan apabila:
• Perbedaan tekanan inlet dan outlet naik 15%.
• Flowrate turun 15%.
• Turbidity outlet naik.
Prosedur:
- Flowrate Backwash sesuai “service rate”.
- Lama waktu backwash + 15 menit atau
hingga bersih.
- Rinsing selama 10 menit atau hingga bersih.

8. ULTRA FILTRATION (UF)
 Parameter Operasional
- Selalu catat Flowrate, Pressure inlet&outlet
 Turbidity ( ntu )
- Cek dan catat nilai Turbidity feed water dan produk UF
 Motorize Auto Flushing Valve
- Cek limit switch
- Cek perputaran OPEN/CLOSE
 Leakage
- Cek kebocoran
CEB / EFM dan CIP

9. Proses pada UF System
 Filtration Service
 Reverse Filtration (RF) / Back Flush & Air Scrubbing (AS)
 Enhanced Flux Maintenance (EFM) / Chemical Enhanced Backwash
(CEB)
- 500 ppm NaOCl + NaOH (pH 12)
- Low pH (HCl, H2SO4, Citric Acid, etc), pH 2
 Cleaning in Place (CIP)
- High pH (NaOH + NaOCl)
- Low pH (HCl, H2SO4, Citric Acid, etc)

10. Hal-Hal Yang Perlu Dimonitor Dalam
Pengoperasian UF
 TMP (Trans Membrane Pressure) Maks 0.5 bar
 SDI-15 air Hasil UF Maks 5
 Turbidity Outlet Maks 0,5 ntu
 Saat EFM / CEB :
- Kadar Free Chlorine 500 ppm
Jika EFM / CEB tidak bisa menurunkan TMP ke 0.2 – 0.5 bar, sebaiknya dilakukan CIP

11. 2. Normal operation
Filtration, AS/RF and Flushing

12. Process sequence
EFM
Duration : 1 hour
(including rinsing)
@ every 2 days
with 500 ppm NaOCl
CIP
Duration : 8 hour
(including rinsing)
@ every 1 month (or TMP 1.5~2bar)
with 2,500 ppm NaOCl + 1% NaOH
and then 1% Citric Acid
Integrity test
with 200kPa air
Filtration
(240m3/hr/unit, 1675sec)
AS/RF
(AS 240Nm3/hr/unit,
RF 120m3/hr/unit, 60sec)
Flushing
(240m3/hr/unit, 35sec)
Normal operation (Repeat : Filtration, AS/RF and Flushing)
Membrane breakage check
Membrane cleaning by
chemicals

13. Filtration

14. AS/RF (Air scrubbing & Reverse Filtration(=Back Wash))

15. AS/RF (Air scrubbing & Reverse Filtration(=Back Wash))
AS/RF
Air
RF

16. Flushing

17. Flushing
Flushing

18. 3. Chemical cleaning
EFM (Enhanced Flux Maintenance)
CIP (Cleaning In Place)

19. Process sequence
EFM
Duration : 1 hour
(including rinsing)
@ every 2 days
with 500 ppm NaOCl
CIP
Duration : 8 hour
(including rinsing)
@ every 1 month (or TMP 1.5~2bar)
with 2,500 ppm NaOCl + 1% NaOH
and then 1% Citric Acid
Integrity test
with 200kPa air
Filtration
(240m3/hr/unit, 1675sec)
AS/RF
(AS 240Nm3/hr/unit,
RF 120m3/hr/unit, 60sec)
Flushing
(240m3/hr/unit, 35sec)
Normal operation (Repeat : Filtration, AS/RF and Flushing)
Membrane breakage check
Membrane cleaning by
chemicals

20. EFM & CIP
Chemical cleaning can be performed in two ways:
1) EFM (Enhanced Flux Maintenance) :
short term, frequently with dilute chemicals (every 2 days with 500 ppm NaOCl)
2) CIP (Cleaning In Place) :
long periods, infrequently with high concentration of chemicals
(every 1 month (or TMP 1.5~2bar) with 2,500 ppm NaOCl + 1% NaOH and then 1% Citric Acid)

21. Cleaning chemicals

22. EFM & CIP procedure – 1) Seawater drain
(After AS/RF and Flushing of normal operation)

23. EFM & CIP procedure – 2) Replacement by fresh water
Fresh Water
(LOW TDS)

24. EFM & CIP procedure – 3) Chemical recirculation
(And then, chemical discharge and chemical rinsing)

25. 4. Chemical cleaning
EFM (Enhanced Flux Maintenance)
CIP (Cleaning In Place)

26. Process sequence
EFM
Duration : 1 hour
(including rinsing)
@ every 2 days
with 500 ppm NaOCl
CIP
Duration : 8 hour
(including rinsing)
@ every 1 month (or TMP 1.5~2bar)
with 2,500 ppm NaOCl + 1% NaOH
and then 1% Citric Acid
Integrity test
with 200kPa air
Filtration
(240m3/hr/unit, 1675sec)
AS/RF
(AS 240Nm3/hr/unit,
RF 120m3/hr/unit, 60sec)
Flushing
(240m3/hr/unit, 35sec)
Normal operation (Repeat : Filtration, AS/RF and Flushing)
Membrane breakage check
Membrane cleaning by
chemicals

27. Integrity test (Air bubble test)

28. Integrity test (Air bubble test)
1) Product out(AT102 MOV101) open  2) Air inlet(AT102 MOV 109) open  3)
Replacement by pressure air and reached 2bar.G  4) Air inlet close  5) Air bubble
checking at TP joint (within Max. 5min)  6) Slowly air release using AT102 BV106 
7) Flushing  8) Filtration

29. Integrity test (Air bubble test)
Checking for bubble occurrence
through transparent TP-joints 1 fiber breakage @ 1bar.G

30. 5. Fiber breakage repair

31. Fiber breakage repair
Remove the module from the unit, and remove the cap on the module‘s permeate outletend.
Fit an O-Ring onto the module end face on the permeate side. Pour clean water (e.g., permeate) onthe
permeate end of the module until water completely covers the surface.

32. Fiber breakage repair
Check the air bubble using air pressure supplied from feed side.
Insert (hammer in) the nail to a depth of about 1cm and then cut offit.
Re-check whether air bubble occurs or not.

33. Fiber breakage repair - Precaution
25mm
Inserting a nail deeply may
damage a neighboring
fiber as illustrated.
Insert a depth of
10-15mm
Cut the nail 2
to 3 mm above
the end face

34. REVERSE OSMOSIS
 Parameter Operasional
- Conductivity, D Pressure, ORP, Flowrate
 Ketersediaan Bahan Kimia
- Cek level pada chemical tank
- Pengisian bahan kimia pada chemical tank
 Cleaning in Place (CIP)
 Leakage
- Cek kebocoran

35. Pompa & Motor
 Cek temperatur motor dan pompa
 Cek arus listrik motor
 Cek getaran motor dan pompa
 Cek tekanan operasional pompa
 Cek flowrate pompa
 Penambahan grease pada motor secara periodik

36. RO System Trouble Shooting