Dairy Surface Water Disinfection - Case Study -

• Dairy Farm - Continental, OH

• 600 head of dairy cattle

• Milked 3 times/day

Facility Background

Original System Profile

• 300 ft. well capable of 100 GPM Raw water flows through a Plate Coolerinto a 6.5 million gallon holding pond• Water use:

- Drinking water for 600 head of dairy cattle- Plate cooler (milk cooling)- Wash down (Rinse use only)

The Problem

• Raw water analysis revealed high levels of hydrogen sulfide and calcium hardness.

• Poor water quality dictated surface water treatment

Table 1: Results of Pre-treatment Water Analysis

Contaminant Result Unit Hydrogen Sulfide 100 PPM Total Hardness 1,026 (60) PPM (GPG*) * Grains Per Gallon

To produce milk at maximum levels, dairy cattle must be well hydrated

• High hydrogen sulfide levels create aesthetic problems,reducing water consumption.

• Hydrogen sulfide dramaticallyshortens the life of expensiveequipment.

Importance of High Quality Water

New SystemNew System

Based on the water analysis, the well water will be used through the plate cooler only prior to being sent to the holding pond.– Plate cooler requires fairly consistent water temperature (approximately

54˚ F)– High hydrogen sulfide and calcium levels do not have adverse effects on

the plate cooler.

New System (Continued)

The following system components were installed to treat the Holding Pond water for cattle drinking water and wash down use.

• Two 5.0 hp submersible pumps pull water from holding pond• Slow sand filtration filters water from pond• 5,000 gallon atmospheric holding tank fills by a float switch• 20 gram/hour corona discharge ozone generator

• Oxygen feed at 14 SCFH by an oxygen concentrator• 3/4-hp pump (40 GPM) for recirculation of the atmospheric tank

• Signet ORP (Oxidation Reduction Potential) Controller• Chlorine Feeder (for holding tank sanitation)• 5.0 hp centrifugal pump to re-pressurize the system• Multi-media filtration• Cation water softener (for wash down use only)

System Schematic

System Schematic (continued)

Results

•Water Disinfection- Maintaining an 850mV of ORP in the holding tank

Note: Bottled water standard is 650mV ORP

- Chlorine residual .200 PPM (for holding tank sanitation)

- In compliance with the counties Health Department regulations

- In compliance with Ohio State Department of Health’s

rule #3701 for continuous disinfection

•Milk Production- Before Ozone System: 62lbs./day average per cow

- After 90 Days with Ozone System: 72lbs./day average per cow

- Currently with Ozone System: 85lbs/day average per cow

Increase in production attributed to cattle drinking more water!

Benefits

• Higher milk production = $$$

• Water has been purified and disinfected

• Extended life of equipment

• Less chemical use

• Less chemical storage

• Less chemicals to sewer or waste

Other Dairy Applications

• Anti-microbial wash- Bulk milk tanks- Bulk milk tank transfer

lines- Feed bottles and

nipples- Teat’s- Teat cups

- Equipment - Floors and walls

• CIP (Clean In Place) Systems• Hard Surface Cleaning• Waste water• Residential drinking water• Odor control - office use