Finding Yin and Yang
By Anastacia Crowe
Living a life of balance is not easy, but a VACB farmer we visited who lives in the My Khanh Village in the Mekong Delta seems to be doing just that. Tucked away in a small village on the outskirts of the city of Can Tho, we were greeted by the smell of flowers, the coolness of an area covered by foliage, and the sounds of people whirring past us on their motorbikes. The only thing that was missing was the sight and sound of cars in the area, making our short walk to the pig farmer Mr. Than’s house pleasant, without the constant buzz of the city. We spent the better half of our day at Mr. Than’s house, learning from him and Dr. Chiem about the closed energy farm system he currently resides in and operates.
The VACB system is essentially a combination of: Vuon or Orchard, Ao or Pond, Chuong or Pig-pen, and Biogas. It’s a closed cycle where they raise pigs in an enclosure that allows the family to feed their food scraps to the pigs and where the pigs’ excremental waste is washed away and collected in a biogas digester (rather than washing into the river system). This in turn creates and captures methane that the family can then use to fire their stoves and even power their homes. This particular family used the methane to run a generator that powered its irrigation system, as well as their household electricity needs.
In addition to using pig waste as a way to create methane, the family uses a plant called bèo tai tượng (or water lettuce, Pistia stratiotes). The organic matter from the plants is digested in much the same way as the pig waste: in a large plastic tube, where it slowly decays and releases methane, filling up the tube. The waste leftover from the biogas digester is then transferred to the fishing ponds where it provides feed for the fish (saving the farmer 50% of cost for fish-food) and provides a layer of organic sediment which the farmer can remove later in the year to fertilize his orchard or garden.
In this sustainable model, everything that is used or created as waste goes towards providing something necessary for the other parts of the system; everything is interdependent and interrelated. This model is similar to Lifeline Produce, a farm where I worked for a summer located in Victor, Montana—the family there uses a closed system farming technique, using no synthetic fertilizers, insecticides, herbicides or hormones. They choose to use organic compost to fertilize their fields, and only organic pesticides when needed. Furthermore, they produce their own biodiesel—from leftover oil discarded from restaurants around Missoula—to power their vehicles and the tractors needed for various tasks around the farm.
Here on the VACB farm, the waste is used to produce not only food or fertilizer, but new energy as well. The pig waste is also used to create methane—that would otherwise be released into the air in the form of a greenhouse gas—that can then be used to provide energy for the family. Through this system, the family saves approximately two liters of gas a day that would otherwise be used to power their home. Waste and production are not usually complementary terms, but in this system, they are. Without the waste from the family or the pigs, there would be no renewable source of energy for the farmer to power his home, or food to feed the fish that the family harvests for their meals. Each part of this system provides a balance to the other parts of the system, making it all run smoothly.
Another thing that stood out to me about this commune was how different it was from the city of Can Tho; instead of being a hot and sweaty concrete jungle, it was a cool and refreshing green space. It’s as if the village is the yin to the cities yang; even spending a day in the communes natural, green space made me feel more balanced. I am accustomed to living in a place where green spaces are only a bike ride or walk away, so spending the majority of our time in these cities has made me feel like something was missing. But by visiting this place, I finally felt like I was beginning to balance my yin and yang.