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Study On Dairy Farm In California Shows That Use Of Biodigesters Can Cut Methane Emissions By Up To 80%.
A giant tarp stretched over a manure lagoon may seem like just a curious detail on a dairy farm. But behind this biodigester structure is one of the most promising transformations in the fight against global warming: the capture and reuse of methane.
This technique, tested and confirmed in a recent study, showed that it is possible to reduce emissions of this gas by approximately 80%. And the best part: methane can be reused as fuel, turning a problem into a solution.
The Change Starts With Manure
The study was conducted by the University of California, Riverside. The research analyzed a family farm located in Tulare County, in the San Joaquin region, one of the largest dairy producers in the United States.
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The site was monitored for two years — one year before and one year after the installation of the biodigester. During this period, a van equipped with gas sensors traveled the surroundings, collecting data with high precision.
After the installation and adjustment of the system, the reduction in emissions was clear and significant.
How The System Works
The applied technology is relatively simple. It consists of a biodigester: a structure that completely seals the manure lagoons, preventing methane gas from escaping into the atmosphere.
This sealing is done with a large airtight membrane. The tarp covers the accumulated manure, and thus, the methane is contained, purified, and redirected to be used as biofuel. Instead of being released into the air, it powers heavy trucks and other vehicles that normally run on diesel.
The methane gas is highly polluting. It has a global warming potential over 80 times greater than CO₂ when considering a 20-year period. Therefore, containing these emissions has a direct impact on reducing the greenhouse effect.
A Recurring Problem On Farms
A large part of the methane emitted in California comes from dairy cows. This includes both gases released during the digestive process and those produced by manure.
On traditional farms, manure is stored in open pits. Without contact with oxygen, this material decomposes and emits methane. The technology of the biodigester changes this scenario, offering an alternative with environmental and energy returns.
Limitations And Challenges
Despite the positive results, the technology has limitations. It does not treat other pollutants, such as ammonia and fine particles, which also affect air quality.
Additionally, installation requires high costs, environmental permits, and constant maintenance. In other words, it is not a viable solution for all properties.
But for farms that have the conditions to adopt the technology, the cost-benefit is clear.
Collaboration Between Science And The Field
The study also highlighted how the union between scientists, farmers, and industry can generate concrete results. After detecting leaks, adjustments were made in partnership with local operators. This expanded the impact of methane reduction.
The California government is also investing in satellites to monitor potential methane leaks in real-time. This way, action can be taken quickly when there are spikes in emissions.
Potential For Transformation
The large-scale application of biodigesters could change the landscape of agribusiness. In addition to containing emissions, the technology transforms waste into an energy source.
Among the main benefits are:
– Reduction of greenhouse gases;
– Replacement of fossil fuels;
– Valorization of organic waste;
– Stimulation of the local economy with sustainable technologies.
Although it is still a solution with technical and economic limitations, the results of the study from Tulare show that it is possible. When there is alignment between science, public policy, and the productive sector, the impact can be great.
If expanded and integrated with other sources, such as solar energy and efficiency technologies, this strategy could represent an important step towards cleaner and modern agriculture.
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