TÀI LIỆU XỬ LÝ NƯỚC CÔNG NGHIỆP (industry water treatment)

Industry water treatment


Content
 前前前 Introduction)
 工業水流程圖 (Flow diagram industry water)

 製程原理 ( Principle manufacturing process)

 處理流程 ( procedure treatment)


I.

Introduction

 Impurities of Raw water apply process of precipitation to

filter :



Need a long time



Require a larger area to treat
Economic effectiveness low

There for: add chemical medicine


To increase agglutination



Rapid of precipitation faster


II. 處理流程 ( procedure treatment)
Raw water
Coagulation
flocculation

Chemical
Storage and
Dosing

Sedimentation
filtration
Clean water (WI) storage

Sludge Handling


一 . Raw Water Pre-treatment
Storage Basins

Raw Water
Basin
(250,000m3)

III.製程原理

 Impurities in Raw water :
o

Float Solid( Suspension)

o

Colloid grain

o

Soluble Solid

o Diameter of Suspensions is greater than 1 µm, they able to

use gravity effect to remove. Soluble Solid depend quantity
of moleculer, their diameter less than 10-3µm

o Important element in Industry Water is Collid grain, their

dimension about 10-3µm~10-1µm


粒徑對沉降速率的影響
Diameter of

Order of Size
Area

Total Surface Time Required
to Settle

10

Gravel-rải sỏi

0.487 in2

1

Course Sand-duong bai cát

4.87 in2

0.1

Fine Sand

48.7 in2

38 sec

0.01

Silt

3.38 ft2

33 min

0.001

Bacteria

33.8 ft2

55 hr

0.0001

Colloidal Particles 3.8 yd2

230 days

0.00001

Colloidal Particles 0.7 acre

6.3 yr

0.000001

Color Particles

63 yr minimum

Particle, mm

7.0 acres

0.3 sec
3 sec


 Before treatment, Colloid grain must stable ( distribute),

not coagulate, not precipate.
 There are two factor:

Grains in Surface will be absorb to form thin layer
Surface of Collid grain exist electric charge
Elotrostatic repulsion, Raw water stable


SURFACE CHARGE ( 表面電荷 )
COAGULATION
Cation
Anion

S.S
.
Surface Potential
Fixed Layer
Shear Plane
Zeta Potential

Potential

Distance

OH －
Al3+/Fe3+
/Fe2+


 Distribute Collid use chemical medicine to assist, increase

coagulation and flocculation effect This Coagulation
effect will be break stability, Floculation effect will be
combine small colloid grains to bigger colloid grains
 Coagulation use Al2(SO4)3 at rapid mix basin
 Flocculation use POLYMER at slow mix basin


 After Al2(SO4)3 solubilize in water created positive

charge, they asborded negative charge  neutralize
electric charge to form small colloid grains. Beside,
create colloid solid grains. It will be combine colloid
grains  increase collideing with another.

 After

add POLYMER in water, it formed polymer
strip,it able to asborb suspensions, to form colloid

polymer, increase volume of colloid easier to
precipitate and filter.



 Firstly small micro flocs formed which agglomerated

to form larger macro flocs. These macro are easily
settled or filtered from the water.Synthentic polymers
have replaced inorganic polymer and natural polymer.
Flocculant dosing is starts until coagulation has been
completed.
硫酸沉
(20PPM)

原水池
Raw Water
Basins

原水沉

液態
POLYMER
(20PPM)

逆洗水回收

混凝池

膠羽池

沉殿池

砂濾池

沉水池

Coagulation

Flocculation

Sedimentation

Filtration

Clean water

沉泥循環沉

(20 ～ 120M3/Hr)

沉泥輸送沉
(10 ～ 20M3/Hr)

工業水


 Use Al2(SO4)3 can reduce alkalinity in water. If

alkalinity not enough, value PH able to reduce and

drop outside work scope. Impact of effect medicine.

 If alkalinity not enough, we are able to add NaOH to

balance.

 Using NaClO able to prevent bacterium…… And

prevent harmful for human


 Sludge Recycle: Using a recycle of dense sludge , the

sludge concentration in the flocculation zone
constant.

硫酸沉
(20PPM)

液態
POLYMER
(20PPM)
逆洗水回收

原水池
Raw Water
Basins

工業水沉

原水沉
混凝池

膠羽池

沉殿池

Coagulation

Flocculation

Sedimentation

砂濾池

沉水池

Filtration

Clean water

沉泥循環沉

(20 ～ 120M3/Hr)

沉泥輸送沉
(10 ～ 20M3/Hr)


硫酸沉

(20PPM)

液態
POLYMER
(20PPM)
逆洗水回收

原水池
Raw Water
Basins

工業水沉

原水沉
混凝池

膠羽池

沉殿池

砂濾池

沉水池

Coagulation

Flocculation

Sedimentation

Filtration

Clean water

沉泥循環沉

(20 ～ 120M3/Hr)

沉泥輸送沉
(10 ～ 20M3/Hr)



 Rapid mix tank use Al2(SO4)3, use stirrer mix rapidly,

to mix even. Increase collision among colloid grain
and break their stability .


 Slow mix tank originaly add POLYMER and using

Stirrer to mix. With purpose create bigger colloid
grains from small colloid grains