For the last six years, a power plant in San Luis Potosi, Mexico has bought water from a nearby wastewater treatment plant to use in its cooling towers (instead of using freshwater). This operation, Project Tenorio, a public-private partnership, continues today and has already resulted in the reduction of groundwater extraction of at least 48 million cubic meters (equivalent to 19,000 Olympic size pools) and increased aquifer sustainability.
This is a good example of the water and energy nexus in practice: the wastewater treatment plant covers almost all of its operating costs from this additional revenue stream and the power plant gets a more reliable water source that is also 33% cheaper than groundwater in that area.
Treated wastewater has been used to reduce the water requirements of power plants in several other countries as well, as water supply becomes more variable or disappears. In the US, for example, around 50 power plants are using treated wastewater for cooling in order to adapt to water shortages. However, innovative integrated approaches like these are still more of an exception than the norm.
For users of water-based sanitation, most of us give little thought to what happens after we hear the sound of the toilet flushing. Wooooosh -- out of sight, out of mind.Certainly, there is massive benefit to be derived from owning and using a functioning toilet.
But what if you were told that there is nothing at the end of the sewage pipe that actually deals with what flows down the toilet? What if you learned that every flush pollutes the environment, and that combined with the chemicals, heavy metals and nutrients from industrial pollution and agricultural run-off, the improperly treated waste was turning rivers, lakes and estuaries into dead zones? Would you think twice next time you flushed?
Evaluating the existence and extent of droughts is not an easy task. Not only are droughts "slow-onset" events that creep into the physical, environmental, and social systems of a region, they also have effects that span numerous sectors of a society. The U.S. Drought Monitor (USDM), as recently described by Dr. Michael Hayes from the National Drought Mitigation Center (NDMC) during a recent presentation at the World Bank, provides an example for other nations as they consider how to effectively manage this difficult endeavor of characterizing drought risks and impacts.
Kerala is a beautiful state in South India, home to about 34 million people, many of whom share my pride as a Keralite. Of all the states in India, Kerala scores the highest on the human development index, has one of the highest literacy rates in India (around 95%), a low Infant Mortality Rate, gender ratio in favor of the female population, stunning landscapes (highlands, mid-lands, low-lands), and a booming tourism industry. It is God’s own country, as the promoters of tourism industry has named it.
Open defecation – going outside without using a toilet or latrine – is one of the most important threats to child health and human capital, period; ending it must be a policy priority.
This year’s World Water Day (March 22) focuses on cooperation around water, so it’s a good time to reflect on lessons that those of us working on cooperation in international waters can learn from the experiences and accomplishments in water cooperation in the Nile Basin.