Moorepark Milk Quality Workshop 2011 Detergent update David

Moorepark Milk Quality Workshop 2011 Detergent update David Gleeson

Introduction u Detergent product list u Cleaning system experiments at Moorepark u Operational costs of different cleaning systems

Detergent lists u 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/biocidalproductregister. January 2011. pdf

Important points in relation to detergent sterilizers u 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 @ 360 mls/45 litres = 800 ppm or 18% caustic @200 mls/45 litres =800 ppm) u Detergents with a lower working solution (< 800 ppm) should give satisfactory cleaning when used with hot water daily and not recycled u Increasing the usage rate of detergent-sterilizer products to achieve higher caustic levels may result in nonacceptable levels of chlorine in the working solution u Acceptable chlorine levels in the working solution may range between 150 and 320 ppm depending on water temp (e. g. 3. 5% chlorine@ 360 mls/45 L =280 ppm or 4. % chlorine @ 360 mls/45 L =320 ppm)

Chemical analyses of detergents u Caustic range for detergent-sterilizers: – < 1 to 19 % – 59% of products with caustic levels below 10% u Chlorine range: – <1 to 9. 5% – 34% above 4. 0%

Important points in relation to powder detergent products u A number of powder products contain acceptable levels of chlorine (20%) u Working solutions for cold caustic cleaning greater than 2000 ppm are recommended – lower WS when chlorine is present (800 PPM) u A small number of powder products are recommended to be used as hot wash only (these may also be used at lower working solutions) u Some products contain high levels of sodium carbonate while other products contain high levels of non caustic alkaline detergents which have additional cleaning benefits. u The usage rates of caustic only powder products may be increased to increase the working solution u 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 P 3 -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 u u u 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 u liners u stainless steel u

Cleaning systems evaluated PRODUCT W. S Caustic ppm Water temp Usage rate mls/45 L Add. product Once wk Acid Descale 1 P 3 -mip. CIP 2, 772 cold 450 2 P 3 -mip. CIP 1, 848 hot 300 3 P 3 -mip. CIP 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 chlorine weekly

Summary of results Treatment P 3 -mip. CIP cold P 3 -mip. CIP hot/chlorine P 3 -mip. CIP-cold acid-hot Hypral SP hot Liquid Gold hot Multisan CF cold/hp Parlosan NC cold/hp TBC (average) Thermodurics (average) Tank TBC (24 hr) (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 u u Low bacterial numbers observed on stainless steel & milk liners No significant difference for any washing system at wk 3 compared to wk 1 u SS, wk 1= 100 cfu, wk 3= 200 cfu u Liners, wk 1=100 cfu, wk 3= 140 cfu

Increase in bacterial numbers observed on ‘plastic’ from week 1 to week 3 Week 1 Week 3 sig P 3 -mip. CIPcold 13, 000 39, 000 < 0. 01 P 3 -mip. CIPhot/chlorine 7, 200 27, 500 < 0. 05 P 3 -mip. CIPacid 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 P 3 -mip. CIP cold 0 0. 000 P 3 -mip. CIP hot/chlorine 0 0. 000 P 3 -mip. CIP acid 0 0. 000 Hydral/hot 0 0. 000 211 0. 000 Multisan CF/cold/p 0 0. 000 Parlosan NC/cold/p 0 0. 000 Liquid Gold/hot

Cost of cleaning products PRODUCT Price of product used in calculations litres Descaler 58 25 29. 95 20 12. 5 5 68 22 37. 50 20 Multisan 29 20 Parlosan 30 20 Chloras 21 25 P 3 -mip. CIP Boost/blast 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) P 3 mip. CIPcold 1. 89 0. 00 0. 24 0. 08 950 982 P 3 mip. CIPhot/ch 1. 26 0. 03 0. 24 1. 10 1128 1578 P 3 mip. CIPacid 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 Liquid. Gold/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 Total cost 10 units Lactation (DR)

Discussion u All cleaning systems gave satisfactory cleaning performance when used as recommended for the period tested-longer test time may be necessary u New cold cleaning systems more expensive than existing Teagasc recommended cleaning system (NR, 10 units, year € 658 v € 1014) u Cold wash systems have similar running costs as twice-daily hot detergent sterilizer systems if using NR (10 units, year € 1014 v € 1028) u Lowest TBC & Thermoduric levels observed with daily hot acid wash PM -but at a cost ! (NR, 10 units, year, € 658 v € 1372) u 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 u Increased occasions of acid cleaning and hot water usage had the biggest impact on TBC & Thermodurics u Cleaning systems had no impact on TCM when used correctly u Cold wash systems – Longer term evaluation – Recycling of product not evaluated u Caution- Caustic only cold wash systems require contact time to be effective – suitability for bulk tank cleaning?

Future cleaning system studies u u 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