X

Showroom


PROGRAM CONTROLLING PARAMETER
 

No.

Items

Unit

Range

Method

Frequency

In charge

1

PH

-

8  ÷ 9

PH meter

Daily

Customer

2

Turbidity

NTU

< 100

Turbidity meter

Weekly

Supplier

3

Suspended solids

PPM

< 100

Filtration/Oven/Analytical Scale

Weekly

Supplier

4

% Sludge Solids

%

> 60

Oven/Analytical Scale

Weekly

Supplier

5

Foam Level

Inch

< 1

Visual/Measurement

Daily

Customer

6

Conductivity

µS

< 3000

Conductivity Meter

Daily

Supplier

7

COD

mg/l

<10,000

Analytical

Weekly

Supplier

8

Viscosity

S

< 32

Standard cup Ø 2.5

Weekly

Supplier

9

Chloride

mg /l

1

Analysis

Weekly

Supplier

10

Bacterial count

CFU/ml

>10,000

Bacteria Count Test Kit

Weekly

Supplier

11

Solid collect as sludge

 

 

Oven/Analytical Scale

Weekly

Supplier

12

Smell

TCVN

Follow up 5939, non smell

Analysis

Monthly

Supplier

 

TROUBLESHOOT GUIDE:

SYMPTOM

PROBABLE CAUSE

ACTION

Good Paint Kill

N/A

No Action

Poor paint kill / very tacky or sticky paint or water has paint color

1. Improper pH
2. Underdose detackifier
3. Dead spot
4. Sticky paint from debris of booth grate cleaning
1. Correct pH
2. Increase detackifier
3. Mechanical adjustment or preventative maintenance
4. No action needed

T > 60 NTU, tacky paint, dirtier water with paint color, lack of chemical foam in pit, and lack of sludge collection

1. pH is above spec

2. Underdose Detackifier

1. Correct pH
2. Increase detackifier

T < 20 NTU, wet sludge

1. Overdose detackifier

2. Overdose flocculant

Reduce detackifier

Reduce flocculant

High T, high SS, wet soupy sludge, excessive chemical foam in pit, and hazy milky water without paint color

1. Overdose detackifier
2. Improper detackifier and locculant ratio
3. Excessive foam from detackifier overdose

Turn off detackifier until paint sludge starts tacky, then re-start detackifier at normal rate

Lower SS by increasing flocculant feeds

May need additional foam depressor along with flocculant to control foam.  Be sure to use foam depressor as low as possible

Hazy milky water with high T (water without paint color), high SS from filtration but no visual SS, moderate chemical activity in pit, and good paint kill

1. Overdose flocculant
2. Chronically high bacteria population (>106).  It’s hard to do filtration through filter paper when doing SS test.
3. High COD/BOD due excessive organic chemical residuals

Reduce flocculant

Shock the system with proper dose of biocide to low it to 103.

Oxidized chemicals (COD/BOD Reducers) such as chlorine, bromine, or hydrogen peroxide can be used to oxidize the organic or surfactant residuals.

SS > 60 ppm

Improper flocculant inversion

Lack of turbulence

Underdose flocculant

Check flocculant Inversion

Move flocculant feed point to where it has the most agitation or add air lancing.

Increase flocculant dosage

SS < 20 ppm

 Overdose flocculant

Reduce flocculant if needed (optional) 

Slimy sludge (jelly-like)

1. Improper flocculant inversion
2. Overdose flocculant
3. Microbio growth
1. Check for flocculant inversion; increase turbulence if necessary
2. Reduce flocculant
3. Feed biocide

Aerobic bacteria  > 106

Underdose biocide

Add 200 to 1,000 ppm MZD7330 to shock the system

Aerobic bacteria  ≤ 104

In spec

Need maintenance dose of 100 ppm MZD7330 or CLOR per week

Foamy

Short break between productions

Overdosed chemicals

Excessive solvent addition especially after booth cleaning activity

Dirty water with paint color

hazy milky water without paint color

Disperse & wet sludge

No action

Adjust chemical feeds

Max out all chemical feeds until foam is in control, then back to normal

Increase detackifier

Decrease detackifier

Decrease detackifier and Increase flocculant

 

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