Between disappearing glaciers and groundwater and intensifying droughts, water supply pressure is on the rise in many regions, creating a great need to use water more efficiently.
The Spoon took a look at emerging technologies that are driving smarter use on farmlands and in food processing facilities. Here are some key innovations that could help the food system adapt to a water-depleted world:
Precision irrigation
Crop irrigation accounts for about 70% of water use worldwide, according to the Organization for Economic Co-Operation and Development. High-tech monitoring systems can help to ensure that irrigation water is being used as efficiently as possible.
California-based startup Ceres Imaging company captures aerial images of farmers’ fields, and then runs them through crop-specific data models to analyze plant health. Ceres can get an idea of how much water is in the soil using color infrared imaging — and can also use its proprietary Water Stress Index to detect irrigation issues. CropX of Israel takes a different approach, using a network of soil sensors to analyze moisture and other conditions.
Updated irrigation systems are also helping farmers to save water. Drip irrigation involves laying “drip lines” of tubing along crop rows. The drip lines are fitted with water drippers at intervals to apply a specific amount of water to each individual plant.
Wastewater management
At the processing stage, many plants consume large quantities of water to perform cleaning operations. Businesses must then decide what to do with the resulting wastewater, most of which flows back out into the environment.
A handful of startups are developing high-tech systems that help businesses to find secondary uses for that wastewater. California-based startup Aquacycl has developed a microbial fuel cell (powered by bacteria) that both treats wastewater and generates electricity. According to a Forbes interview with company CEO Orianna Bretschger, the system removes 70% of suspended solids and high levels of carbon and sulfur from wastewater — and the cleaner, resulting water can be recycled for use in cooling processes and other industrial operations.
Indoor farming
Indoor farming systems allow growers greater control over evaporation and soil drainage. Growers can also recycle irrigation water using recirculating systems; and can precisely control the amount of water that is applied to each plant using automation systems. The budding industry also cuts water use at the produce processing stage: There’s no need for triple-washing, as indoor-farmed produce is grown in a clean and controlled environment.
So it’s no wonder that many indoor farming companies boast high rates of water savings. Gotham Greens, Freshbox Farms, and Infarm all estimate that their systems use 95% less water than conventional agriculture to grow the same amount of produce.
The U.S. Forest Service estimates that 50 years from now, about half of freshwater basins in the country will be unable to meet monthly water demand. Annual drought conditions as well as concerns about a water-scarce future are likely to continue driving tech innovation in the space. Food growers and producers alike may also find that increased transparency around water-saving practices appeal to consumers who are looking for sustainable options.
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