UPW system introduction

Topics: Water, Reverse osmosis, Water purification Pages: 40 (2557 words) Published: June 18, 2014
UPW System Introduction

Purpose of this training
Introduction of units





Theory
Application/Function in DI System
Operation

After this training:





Know the theory of main units
Understand the function of units in DI system
Understand the possible causes of abnormal
performance

Daily Operation
To take care of the system






To watch
To listen
To smell
To feel

Why???






To find out problem on time, minimize loss
To prevent problem happening
Data collection for analysis
“It was” can’t guarantee “it will be”!

Daily Operation
What are the daily jobs?










Regeneration
Parts replacement
CIP
Chemicals top up
Trouble shooting
Paper work
Meeting


Daily Operation
Our goal:



To maintain water treatment system at tip-top condition in order to produce pure water for manufacturing process



To apply best known methods in process to optimize unit cost of water purification process



To minimize system incident which will cause supply interruption or system down time



To eliminate ESH issue

Water Resources
The volume of all water on Earth
is about 1,360,000,000 km³
(326,000,000 mi³).







6

In the Ocean: 1,320,000,000 km³,
97.2%
Solid Form: 25,000,000 km³, 1.8%
Underground: 13,000,000 km³,
0.9%
Surface: 250,000 km³, 0.02%
Atmosphere: 13,000 km³, 0.001%

Ocean
Glasier
Underground
Surface Water
Atomosphere

Water Chemistry
-

O
H

H
+

H2O




Hydrogen Bond (H2S B.P.= -60.3 C, H2O B.P = 100 C)
Polarized Molecular
Excellent Polar Solvent

H2O H++OH-


7

Resistivity 18.24 M

@25

C

Impurities in Water
Suspended Matter




Microorganisms
Dust

Dissolved Gases





Oxygen
Carbon Dioxide
Chlorine

Ions






Cation
Anion
Heavy Metal
Silica

Organics



8

TOC

The UPW generation process is a
series of chemical engineering unit
operations designed to remove
contaminants from water to
achieve an ultrapure level.

Ions
Definitions
Cations - Positively charged ions
Anions - Negatively charged ions

9

Water Analysis

10

Water Analysis
Parameter
Units
Total Dissolved Solids
mg/l
Colour
NA
Total Organic Carbon
mg/l
Turbidity
NTU
Silt Density Index
NA
pH
NA
0
Temperature
C
Resistivity
megaohms-cm
11

Silica

28% of earth crust
Deposits on wafer undesirable
Ionic and Colloidal Form (weakly
soluble)
Removal by Reverse Osmosis /
Strong Base Anion resin

12

Fundamentals of Various Water
Treatment Processes

Typical UPW System Flow Diagram

14

Function of Unit

Impurities
MMF ACF
Particle
Oxidizer
Bacteria
TOC
Dissolved Gas
Cation
Anion
: Excellent
: Fair

15

Cation
Resin

Anion
Resin

RO

UV

Mixed
Bed
Resin

CEDI

VDG

GTM

UF

Pretreatment Solutions

16

Multi Media Filtration


Removes suspended solids
down to 10-12 microns

1. Upper Service Hole
2. Filter Inlet



Media
• Anthracite
• Fine Sand
• Coarse Sand
• Gravel

3. Anthracite Layer
4. Fine Sand Layer
5. Coarse Sand Layer
6. Filter Outlet
7. Gravel Support Layer



17

Steps
• Stand-By
• Pre Rinse
• Service
• Back wash

8. Filter Element
9. Side Service Hole

Multi Media Filtration Operation


SDI = 100 (1-Ti/Tf)/T







Time required to flow 500 mL, Ti and Tf
Time interval of Ti and Tf = T (5/10/15 minutes)
0.45 micron rated filter, 47mm D
Constant pressure 30 psig
What is the max?



Differential pressure



Coagulation and flocculation



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