There are several methods of agricultural water purification. This article will discuss die-off rate, Reverse osmosis, and UV disinfection. In addition, we’ll look at an alternative die-off rate for harvest. Ultimately, we’ll discuss the right technology for the application in your field. But which is right for you? Read on to find out.
Die-off rate for irrigation
A typical farming operation needs a die-off rate of 0.5 log CFU/cm2 or less during a period of irrigation, harvest, and storage. While this rate is high, it is not always necessary to meet it. Alternative water quality criteria can be used instead, such as microbial die-off rates, maximum time intervals, and indicator organisms. Alternative water quality criteria do not require FDA approval but must demonstrate adequate scientific data and do not increase the risk of contaminated produce.
One study found that the die-off rate of E. coli was significantly affected when inoculated onto the surface of watermelon. This reduction was significant within 24 h, but not between twenty-four and ninety-six hours. However, the reduction in E. coli numbers was inconsistent over the entire study period, suggesting that other factors, such as limited sunlight and competition with surface microflora, were the primary stressors.
UV disinfection
One of the simplest and most effective methods for agricultural water purification. This method uses ultraviolet light to destroy any organism by disrupting its DNA. UV light has a wavelength of 254 nanometers, which is the most effective frequency for killing bacteria. Unlike other methods, UV disinfection is non-toxic and can be used in farms and other agricultural settings. Its effectiveness has been proven in several tests.
We assessed the efficacy of UV disinfection by comparing the coliform count in lettuce and endive grown with and without it. We found that coliform concentration was comparable to that of the control group. We also observed no negative impacts on the sensory quality of the crops grown in the UV-treated water. This result is further supported by the high efficiency of UV disinfection in farming.
Reverse osmosis
The reverse osmosis process is commonly used in the dairy industry for producing whey protein powders. This process reduces shipping costs by concentrating milk. The liquid left after cheese manufacturing is called whey. This liquid can be further processed into different whey powders. The process benefits both the dairy and meat industries as it eliminates the need to crystallize and dry milk before it is sold.
The reverse osmosis irrigation system utilizes high-quality, imported reverse osmosis membranes to remove dissolved salts, colloids, and microorganisms from irrigation water. The system is designed to last three years and requires no additional maintenance. It has high-pressure pumps and automatic controls for inlet and outlet pressures. It is easy to operate and does not require extensive engineering. The membrane element has long service life and can also be reused. The membrane element is regenerated several times and can help the soil and water environment.
