Moorepark Milk Quality Workshop 2011
Detergent update
David Gleeson
Introduction
 Detergent
product list
 Cleaning
system experiments at
Moorepark
 Operational
costs of different
cleaning systems
Detergent lists

Product lists updated for Mar 2011
– Moorepark website-PDF format
(www.teagasc. ie ) link-research & innovation/dairy)
– Separate table for liquid caustic only products
– List: 41 liquid detergent sterilizer & 8 liquid
detergent products, 25 powder products (5
contain chlorine) & 12 liquid sterilizer products
– 7 brands reformulated with higher spec
– Only 32% of liquid detergent-sterilizer or
sterilizer products are registered with DAFF
(Jan/11) – PCS number-new column
– (www.pcs.agriculture.gov.ie/biocidalproductregisterJanuary2011.pdf
Important points in relation to detergent sterilizers

A minimum of 800 ppm in the working solution is
suggested for detergent sterilizers where the product is
recycled and when hot wash is not used at each milking
– Most popular washing system used in Ireland
(e.g. 10% caustic @ 360mls/45 litres = 800 ppm
or 18% caustic @200 mls/45 litres =800 ppm)



Detergents with a lower working solution (< 800ppm) should
give satisfactory cleaning when used with hot water daily
and not recycled
Increasing the usage rate of detergent-sterilizer products
to achieve higher caustic levels may result in nonacceptable levels of chlorine in the working solution
Acceptable chlorine levels in the working solution may
range between 150 and 320 ppm depending on water temp
(e.g. 3.5% chlorine@ 360mls/45L =280 ppm
or 4.% chlorine @ 360 mls/45L =320 ppm)
Chemical analyses of detergents

Caustic range for detergent-sterilizers:
– < 1 to 19 %
– 59% of products with caustic levels
below 10%
 Chlorine
range:
– <1 to 9.5%
– 34% above 4.0%
Important points in relation to powder detergent products




A number of powder products contain acceptable levels of
chlorine (20%)
Working solutions for cold caustic cleaning greater than
2000ppm are recommended – lower WS when chlorine is present
(800PPM)
A small number of powder products are recommended to be used
as hot wash only (these may also be used at lower working
solutions)
Some products contain high levels of sodium carbonate while
other products contain high levels of non caustic alkaline
detergents which have additional cleaning benefits.

The usage rates of caustic only powder products may be increased
to increase the working solution

It is considered that all powder products analysed contain
adequate caustic levels
Caustic content in liquid detergent products on
the Irish market (March, 2011)
Product
% Caustic
w/w
W.S*
Hot wash
W.S*
Cold Wash
Timac CIP
28.08
1747
2496
P3-mip CIP
27.7
1848
2772
Multisan CF**
25.4
1695
2542
Parlosan NC**
24.3
1623
2704
Quantum x L
22.3
558
X
Alkadex Forte
20.6
1028
X
Hypral SP
15.9
1059
x
Sanagard
10.5
524
x
* Working solutions are calculated based on manufactures recommended usage rates and % caustic measured in products
●** The addition of hydrogen peroxide to these products is recommended by manufacturers
Cleaning systems trial





7 washing systems evaluated
3 week period on each of 3 farms (June –Nov)
Auto-washer calibrated for each product
No re-cycling of detergent for second daily
wash
Measurements included
– TBC (n=1,800) & Thermodurics(n=800) for milk
line & bulk tank milk
– TCM for milk line
– Bacterial swabbing: start of wk 1 and end of wk 3



claw pieces
liners
stainless steel
Cleaning systems evaluated
PRODUCT
W.S
Caustic
ppm
Water
temp
Usage
rate
mls/45L
Add.
product
Once wk
Acid
Descale
1 P3-mipCIP
2,772
cold
450
2 P3-mipCIP
1,848
hot
300
3 P3-mipCIP
2,772
Cold/hot
450
daily
4 Hypral SP
1,059
hot
300
weekly
5 Liquid Gold
797
hot
250
weekly
6 Multisan CF
2,542
cold
450
hydrogen
peroxide
weekly
7 Parlosan NC 2,704
cold
500
hydrogen
peroxide
weekly
weekly
chlorine
weekly
Summary of results
Treatment
P3-mipCIP
cold
P3-mipCIP
hot/chlorine
P3-mipCIP-cold
acid-hot
Hypral SP
hot
Liquid Gold
hot
Multisan CF
cold/hp
Parlosan NC
cold/hp
TBC
(average)
Thermodurics
(average)
Tank TBC
(24hr)
(average)
Tank
Thermodurics
(average)
2,181
92
(0-2,700)
14,247
161
67
(0-790)
12,814
69
39
(0-360)
6,856
59
112
(0-790)
8,165
140
90
(0-610)
5,864
86
104
(0-2,600)
11,437
252
123
(0-720)
13,635
205
(410-6700)
2,166
(190-7,200)
1,252
(180-3,500)
2,173
(110-7,100)
2,010
(210-4,300)
1,956
(400-6,300)
2,019
(230-9,400)
Bacterial numbers on milk liners
and stainless steel


Low bacterial numbers observed on
stainless steel & milk liners
No significant difference for any washing
system at wk 3 compared to wk 1

SS, wk1= 100cfu, wk3= 200cfu

Liners, wk1=100cfu, wk3= 140cfu
Increase in bacterial numbers observed
on ‘plastic’ from week 1 to week 3
Week 1
Week 3
sig
P3-mipCIPcold
13,000
39,000
< 0.01
P3-mipCIPhot/chlorine
7,200
27,500
< 0.05
P3-mipCIPacid
17,000
16,500
NS
Hypral SPcold
52,000
70,000
NS
Liquid Goldhot
17,000
45,000
NS
Multisan CFcold
34,000
74,000
< 0.05
Parlosan NCcold
59,000
280,000
< 0.01
Relationship between Thermoduric count and TBC
Thermoduric
category
0
10-20
>20-40
50- 200
>200
No of
samples
174
246
308
282
137
Average
Thermoduric
count
0
10
28
95
521
TBC
1,463
1,769
2,034
2,249
2,378
Milk samples taken during milking (no bulk tank samples included)
Treatment
PPM-Chlorine in
wash solution
TCM
P3-mipCIP
cold
0
0.000
P3-mipCIP
hot/chlorine
0
0.000
P3-mipCIP
acid
0
0.000
0
0.000
211
0.000
0
0.000
0
0.000
Hydral/hot
Liquid Gold/hot
Multisan CF/cold/p
Parlosan NC/cold/p
Cost of cleaning products
PRODUCT
Price of
product
used in
calculations
litres
Descaler
58
25
P3-mipCIP
29.95
20
Boost/blast
12.5
5
68
22
37.50
20
Multisan
29
20
Parlosan
30
20
Chloras
21
25
Hypral SP
Liquid Gold
ESB
€/litre
Night-rate
0.017
Day-rate
0.0087
Source; John Upton
Cost of products may vary depending on the source and may be lower if large quantities are purchased
Weekly costs (€) per unit associated with 9
washing systems
detergent
chlorine
Hydrogen
peroxide
Descale
Acid
Hot water
(night
Rate)
Total cost
10 units
Lactation
(NR)
Total cost
10 units
Lactation
(DR)
P3mipCIPcold
1.89
0.00
0.24
0.08
950
982
P3mipCIPhot/ch
1.26
0.03
0.24
1.10
1128
1578
P3mipCIPacid
0.94
0.00
1.70
0.55
1372
1597
Hypral SP/hot
2.04
0.00
0.24
1.10
1452
1902
Liquid Gold/hot
1.05
0.00
0.24
1.10
1028
1477
Multisan CF/c/p
1.83
0.07
0.24
0.16
990
1054
Parlosan NC/c/p
2.10
0.07
0.24
0.16
1104
1168
LiquidGold/h/c
1.44
0.00
0.24
0.63
993
1250
Liquid gold/h/rec
0.66
0.00
0.24
0.63
658
915
Discussion


All cleaning systems gave satisfactory cleaning
performance when used as recommended for the
period tested-longer test time may be necessary
New cold cleaning systems more expensive than
existing Teagasc recommended cleaning system (NR,10
units, year €658 v €1014)



Cold wash systems have similar running costs as
twice-daily hot detergent sterilizer systems if using
NR (10 units, year €1014 v € 1028)
Lowest TBC & Thermoduric levels observed with daily
hot acid wash PM -but at a cost ! (NR, 10 units, year, €658 v €1372)
Could reduce the usage rate of some detergent
sterilizers if products have a high caustic content
and if using hot water and not re-cyling solution
Conclusions



Increased occasions of acid cleaning and hot
water usage had the biggest impact on TBC &
Thermodurics
Cleaning systems had no impact on TCM
when used correctly
Cold wash systems
– Longer term evaluation
– Recycling of product not evaluated

Caution- Caustic only cold wash systems
require contact time to be effective –
suitability for bulk tank cleaning?
Future cleaning system studies


Evaluation of re-cycling liquid hot/cold
wash detergent-sterilizers and detergent
only cleaning solutions on TBC,
Thermodurics & TCM residues
Evaluation of using disinfectant products
like peracetic acid in the final rinse water
Thank You