Drainwater Recycling

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Irrigation water Pre-treatment

Pre-treating irrigation water is crucial to a successful irrigation system. In greenhouse jargon it called "pre"-treatment because it is the chronological step before fertilising. Continuously analysing and anticipating on source of irrigation water, allows you to be in control of your greenhouse irrigation.
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Sources of Irrigation Water

Pre-treatment of irrigation water depends greatly on the source of water. As irrigation water is directly into contact with your valuable crops, it needs to be controlled from start to finish. Sources of water can be rain water, surface water, well-water or ground water or tap water.

City water for greenhouse irrigation

Utilizing city water, also known as tap water, is generally the most stable and reliable source for irrigation water in many instances. It undergoes pre-treatment at the source, presenting both advantages and disadvantages. If the water has high chloride levels, considering a water softener would be prudent. Additionally, the temperature of city water is typically already at the desired ambient level. However, it is important to note that city water is usually the most expensive option available.

Surface water as source

Three types of surface water include perennial, ephemeral, and man-made. Perennial water is consistent, but ephemeral and man-made types, found in various locations, aren't always reliable. For greenhouse irrigation, a dependable year-round source is crucial as quality and quantity can vary, making pre-treatment more complex due to potential presence and fluctuation of microorganisms and minarals.

Using well water for greenhouse irrigation

Well water can serve as a reliable source of irrigation as it is often available consistently and can be rich in minerals beneficial to plant growth. However, it is crucial to regularly test well water for contaminants and adjust Pre-Treatment accordingly to ensure it meets the quality standards necessary for irrigation. Additionally, depending on the depth and location of the well, water availability and quality can vary, requiring careful consideration and possibly supplementary water sources during periods of high demand or low supply.

Rainwater Collection

Rainwater serves as an excellent irrigation source and can be collected and reused directly from the greenhouse structure. However, its availability is inconsistent, necessitating supplementation or backup from other sources.

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Irrigation Water Temperature

While regulating water temperature isn’t traditionally included in Pre-Treatment processes, it remains crucial for the irrigation cycle. Cold water has the ability to hold more dissolved oxygen compared to warm water, an essential component for irrigation. In contrast, warmer water often provides a conducive environment for the reproduction of microorganisms. However, water that is too cold can induce shock in plants. As a result, in greenhouses, the preferred choice is to use ambient water maintained at 15-20 degrees Celsius. The management of this factor is achieved through a heat exchanger that is linked to the central heating or cooling system of the facility.