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Detergent update

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

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Detergent update

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  1. Moorepark Milk Quality Workshop 2011 Detergent update David Gleeson

  2. Introduction • Detergent product list • Cleaning system experiments at Moorepark • Operational costs of different cleaning systems

  3. 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

  4. 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 non-acceptable 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)

  5. 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%

  6. 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

  7. Caustic content in liquid detergent products on the Irish market (March, 2011) * 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

  8. 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

  9. Cleaning systems evaluated

  10. Summary of results

  11. 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

  12. Increase in bacterial numbers observed on ‘plastic’ from week 1 to week 3

  13. Relationship between Thermoduric count and TBC Milk samples taken during milking (no bulk tank samples included)

  14. Cost of cleaning products Source; John Upton Cost of products may vary depending on the source and may be lower if large quantities are purchased

  15. Weekly costs (€) per unit associated with 9 washing systems

  16. 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

  17. 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?

  18. 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

  19. Thank You

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