REDUCING SODIUM HYDROXIDE IN PROCESS CLEANING

UMASS LOWELL - TURI

Learning with Purpose OUTLINE REDUCING SODIUM HYDROXIDE IN PROCESS CLEANING • BkBackgroun d • Method • Preliminary results • Potential recommendations • Next Steps • Acknowledgements

Learning with Purpose BACKGROUND

• Sodium hydroxide (NaOH) is widely used in

combination with hydrogen peroxide (H2O2) as an effective FCS cleaner. • NaOH (Caustic Soda) is classified as toxic chemical by Toxic Use Reduction Act (TURA). • When used in large quantity it pose significant chemical hazards to the processed food, employees and the environment

Learning with Purpose OBJECTIVES

• 1. EtblihEstablish a miiinimum concent rati on of NOHNaOH/H/ H2O2 for cleaning-in-place (CIP) at Kettle Cuisine (KC).

• 2. Identify and test green alternatives of caustic soda for CIP processes.

• 3. Reduce down-time, energy and labor cost for CIP processes.

Learning with Purpose METHOD

Scaling and weight: place stainless steel (SS)316 coupons in Mac & Cheese, heat at 180°F for 3 hours.

Cleaning with NaOH/ H2O2 and weight: different concentration and temperature.

Physical scrubbing with diluted phosphoric acid.

QC ‐ ATP measurement

Learning with Purpose MEASUREMENT • Dry weight changes among different steps • QC – ATP test – ATP, the energy molecule found in all living things, making it a perfect indicator to determine if a surface is clean or not. – To ensure no product contamination or biofilm development presents on SS surface. – The amount of ATP present in the sample , providing information on the level of contamination.

Learning with Purpose PRELIMINARY RESULTS

Table 1. Alternative experiments associated with concentration of NaOH/H2O2 and descaling temperature. 100% = simulated KC’s application (250 gallons of H2O, 8 lbs of HCL‐5000, 2 lbs of H2O2). Size of coupon: 1.5 inch x 1.5 inch.

Conc. Of NaOH/H2O2 Temperature 100% 75% 50%

82°C √√√ 75°C √ 65°C √

Learning with Purpose PRELIMINARY RESULTS – DOSE

DE‐SCALE RATIO ATP TTESTEST

14 103 ‐‐ 82°C ‐‐82°C 102 12

tio 101 U) a a L L 10 R

100 (R

99 8 98 values

6 Removal 97 ATP

due 96 4 ii 95 Res 2 94 93 0 100% 75% 50% 100% 75% 50% Concentration of NaOH/H2O2 Concentration of NaOH/H2O2 (A) (B) Figure 1. (A) Weight removal test and (B) ATP test of SS316 coupons under 82 °C cleaning temperature. RLU: relative light unit. 0‐10 RLU: good; 11‐30 RLU: caution; over 30 RLU: failure.

Learning with Purpose PRELIMINARY RESULTS - TEMPERATURE

ATP TEST ‐‐ 75% NaOH/H2O2 14

12

10 (RLU) 8

lues 6 va

ATP 4

2

0 82°C 75°C 65°C Concentration of NaOH/H2O2

Learning with Purpose RESULTS

• Clean ing e ffec t of 75% N aOH/H 2O2 with 82 °C75C, 75 °C, and 65 °C is able to pass ATP test.

• Cleaning effect of 50% NaOH/H2O2 with 82 °C is able to ppgass ATP test, but its ATP values are higher than that

of 75% NaOH/H2O2 .

Learning with Purpose POTENTIAL RECOMMENDATIONS

• In 2015 44,662 lbs of sodium hydroxide was used in the clileaning process. • It was anticipated that by 2017 taking production growth into account , an additional 9 ,379 pounds per year would be used.

• Results show using 75% NaOH, considered as the new dosing concentration, about 15% (3.5 Tons) can be reduce annually while achieving same ATP results as 100%. • Reduce CIP temperature to 65oC = savings on energy bill!

Learning with Purpose NEXT STEPS

• Continuing to evaluate the concentration of NaOH/H2O2 (50%) with t emperat ure 82 °Cd50C and 50°C. • Screening alternatives will investigate the following: Phix XIV Chlorine Materials Hydrogen peroxide Ozone Peracetic acid/peroxyacetic acid Phosphoric acid Potassium hydroxide

Learning with Purpose • TiToxics U se R Rdieduction I nsti tute ACKNOWLEDGEMENTS • Kettle Cuisine; Alan

• Xiaobo Liu, Manyun Yang, DiDuniya KjKajang

Learning with Purpose