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

Clean water WI storagefiltration Sedimentation flocculation Coagulation Raw water II..  Impurities in Raw water :o Float Solid Suspension o Colloid grain o Soluble Solid o Diameter of S

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)

 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

I Introduction

Clean water (WI) storage

filtration Sedimentation flocculation Coagulation Raw water

II 處理流程 ( procedure treatment)

Chemical Storage and Dosing

Sludge Handling

一 Raw Water Pre-treatment

Raw Water Basin (250,000m3)

Storage Basins

 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

Diameter of Order of Size Total Surface Time Required

Area to Settle Particle, mm

10 Gravel-rải sỏi 0.487 in2 0.3 sec

1 Course Sand-duong bai cát 4.87 in2 3 sec 0.1 Fine Sand 48.7 in2 38 sec

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 7.0 acres 63 yr minimum

粒徑對沉降速率的影響

 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 Potential

Fixed Layer Shear Plane Zeta Potential

Distance Potential

Anion

Cation

OH － Al3+/Fe3+ /Fe2+

S.S

.

COAGULATION

SURFACE CHARGE ( 表面電荷 )

 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

原水池

Raw Water

Basins

混凝池

Coagulation

膠羽池

Flocculation

沉殿池

Sedimentation

沉水池

Clean water

逆洗水回收

沉泥循環沉

(20 ～ 120M3/Hr)

原水沉

硫酸沉

(20PPM)

液態 POLYMER

(20PPM)

砂濾池

Filtration

沉泥輸送沉 (10 ～ 20M3/Hr)

工業水沉

 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

原水池

Raw Water

Basins

混凝池

Coagulation

膠羽池

Flocculation

沉殿池

Sedimentation

沉水池

Clean water

逆洗水回收

沉泥循環沉

(20 ～ 120M3/Hr)

原水沉

硫酸沉

(20PPM)

液態 POLYMER

(20PPM)

砂濾池

Filtration

沉泥輸送沉 (10 ～ 20M3/Hr)

工業水沉

Raw Water

Basins

混凝池

Coagulation

膠羽池

Flocculation

沉殿池

Sedimentation

沉水池

Clean water

逆洗水回收

沉泥循環沉

(20 ～ 120M3/Hr)

原水沉

硫酸沉

(20PPM)

液態 POLYMER

(20PPM)

砂濾池

Filtration

沉泥輸送沉 (10 ～ 20M3/Hr)

工業水沉

 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