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Thumb H2O Project: Part 2, Water Treatment Options

Craig Thomas
Extension Dairy Educator, Michigan
David Beede
Dept. of Animal Science.

Introduction
Part 1 of this series (Vol 16, No. 1, January 2011) noted the importance of drinking water for dairy cattle. By weight, water is the most important nutrient in a milking cow’s ration, easily making up greater than 80% of total intake by weight. That article focused on the chemical and mineral composition of drinking water. We hope you have been motivated to have your farm’s drinking water tested for the constituents most often leading to water quality issues: total dissolved solids (TDS), sulfate (SO4), chloride, (Cl), iron (Fe), and nitrate-nitrogen (NO3-N).

Further water testing and/or treatment should be considered if the above named constituents are greater than certain acceptable levels (see Table 1). At higher levels the constituents may negatively affect animal health and/or milk production, interfere with the germicidal activity of cleansers and sanitizers (e.g., chlorine), and cause problems with water system components (e.g., pipes and pumps). In fact, some water quality problems like excess iron can lead to such poor animal performance (e.g., health problems, reduced milk production) that it can be a “business-breaker” (2).

waterfig1

High levels of some constituents (e.g., iron, nitrate-nitrogen) also can endanger human health if people are drinking from that water source (1). If levels of these constituents reach “retest levels”, further testing is warranted and one should even consider sending multiple samples to multiple certified laboratories to confirm/deny whether these constituents are truly problematic. If on further testing a constituent reaches or exceeds “actionable levels” dairy producers should seek help regarding water treatment options for their system’s drinking water.

Water Treatment Options
Water treatment options vary depending on the water quality issue involved. A major difficulty in treating drinking water on dairy farms is posed by the huge volumes of water involved. Recall that a high producing dairy cow may consume up to, or even greater than, 50 gal/day. Multiplying this use over hundreds, or thousands of cows, quickly results in a staggering daily volume of water that requires treatment. Thus, one of the best water “treatment” options may be finding an alternate water source that isn’t plagued by the offending constituent (2).

Other water treatment options include distillation (too costly), reverse osmosis (RO), ion exchange resin system (traditional water softener employing salt), oxidation + filtration via aeration (often called an “iron curtain”), and hydrogen peroxide (H2O2) injection systems (2).

Removal of excess TDS and excess sulfate + chlorine usually employs traditional water softeners or RO systems. Reverse osmosis systems remove 80 to 90% of these constituents depending on their design. Conventional water softeners are effective, but not designed to handle large volumes of water and require an acceptable place to dispose of the brine flush water needed to recharge the system.

Designing a Water Treatment System
Depending on the number of animals served, it may be necessary to design a water treatment system in such a way that large volumes of treated water can be stored for use at times of peak demand (2).

Oxidation systems are mainly used to remove excess iron from cattle drinking water. The “iron curtain” system employs aeration to convert the iron to a precipitate ferric (Fe+3) form, which is then subsequently filtered from the water.

The hydrogen peroxide (H2O2) system involves the Fenton Reaction which converts iron from Fe+2 (soluble in water) to Fe+3 (insoluble in water) that can then be filtered out the Fe+3 as a precipitant. This system injects H2O2 into the drinking water (8 oz of 35% H2O2 per 1,000 gal of water) and is quite cost-effective. A suitable injection pump costs around $500 and the cost of 15 gal of 35% H2O2 solution is about $100 (enough to treat ~240,000 gal of water).

When working with water treatment vendors it is absolutely essential they understand the following items about your farm’s situation (2)
1Do they know how much water your dairy farm uses? More than likely your dairy uses much more water per day than the typical water treatment professional is accustomed to. There is a short paper, Estimating Water Usage on Dairy Farms, that helps producers understand the volume of water needed on a modern dairy farm. The paper also has an accompanying spreadsheet that producers can use to estimate daily water needs on their operations. To get a copy of the paper and/or the spreadsheet, send an e-mail to thomasc@msu.edu) or download them from the MSU Extension Dairy Team web site (www.dairyteam.msu.edu -> Nutrition -> Water -> Estimating Water Usage on Dairy Farms (paper) or Estimating Water Usage on Dairy Farms (spreadsheet)).

2 What is the treatment rate (volume/time) of the water treatment company’s system? Again, your dairy will most likely consume water at rates, particularly at peak demand periods, which typical water treatment professionals are unfamiliar. Can their system keep up and provide enough treated water to meet your peak demand?

3 Does the water treatment provider guarantee their system will meet peak demand and reduce the undesirable constituent to acceptable levels? Will their system meet this requirement throughout the expected useful life of the system? Are they willing to provide such guarantees in writing?

4 What is the expected useful life of their system and what are their system’s maintenance requirements and costs? Who is responsible for maintenance—you or them? Do they offer a service contract, and if so, what does it cost and what does it cover?

5 What chemicals (e.g., other mineral elements) does their system/method add to the water and at what concentrations? They may add nothing, but some systems add significant amounts of constituents (e.g., chlorine) that may cause an entirely new set of problems.

6 Ask potential water treatment providers to allow you to contact other customers that use their system. Visit these other installations of this provider’s system to determine whether their products, services, and warranties are as good as advertised. Do not do business with any water treatment provider not willing to provide you this information.

We recommend that you routinely send samples of your cow’s drinking water to a certified laboratory on a quarterly basis and maintain a historical record of those analyses. If your water test results suggest that you may need to consult a professional water treatment company to rectify a problem, an appropriate closing message on water treatment methods would be, “Show me the science and the proof of improved cow health and performance before I show you any payment.” (1)

Part 3 will be the final installment in this series. That article will address the important issue of water delivery. That article will detail the results of the Thumb H2O Project’s measurement of whether the milking cow facilities on operating dairy farms met guidelines insofar as number of waterers, space, location, and cleanliness are concerned.

References

1.  Beede, D.K. 2004.  Water Intake and Supply for Dairy Cattle.  Michigan Dairy Review, Vol. 9, No. 3; July, 2004.

2.  Beede, D. K. 2009. Solving Bad Water Problems for Thirsty Cows. Proc. Western Dairy Management Conf., Reno, NV (https://www.msu.edu/~beede/dairycattlewaterandnutrition.pdf).

3.  Looper, M.L. and D.N. Waldner.  2007.  Water for Dairy Cattle.  Oklahoma Cooperative Extension Service, ANSI-4275.


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