Fog Harvesting An Innovative Fresh Water Harvest


As we know that out of the major global issues that are global warming, increased population, increased pollution etc. Water scarcity is one major issue which involves water stress(difficulty in obtaining sources of fresh water), water shortage and water crisis. In 2005 the UNO declared an international decade for action on “water and life” due to which many countries have been researching how to get fresh water for lower cost and higher efficiency. 

Fog harvesting a method of harvesting water from the fog which was inspired by the natural phenomenon studied in a Nambia desert beetle which uses its wings to trap water from the air and use it for drinking. Using the same techniques researchers constructed fog harvesting meshes made up of nylon, polypropylene.

The meshes were arranged in two-layer structures and kept perpendicular to the prevailing winds in the high hilly areas. The fog which consists of 4% pure naturally desalinated water by sun gets trapped in these meshes. The water collected by these meshes moves downwards due to gravity and gets collected in the storage tanks present under the meshes. The amount of water that can be collected using these meshes differ from place to place on an average it collects 200 to 1000 liters per day. The efficiency of collection improves with larger fog droplets, higher wind speeds, and narrower collection fibers/mesh width. In addition, the mesh should have good drainage characteristics. Water collection rates from fog collectors.

The financial requirements required for supplying a village with 2000 liters per day is about 1500$ (10 lakhs of rupees) which can last up to ten years with regular maintenance. As we know our government uses millions of rupees for supplying enough water to villages. They still lack proper supply due to many reasons. So, therefore, this method can be used to fulfill the water requirements.