Evaporation ponds are artificial with very large surface areas that are designed to efficiently evaporation water by sunlight and expose water to the ambient temperatures.
Uses
Extraction
Salt evaporation ponds produce
salt from
seawater.
Evaporation ponds are used to extract
lithium from underground brine solution. The extracted Lithium is then used to make ion batteries.
use them to separate
ore from water. The ore can be sold for use in different industries.
Potash evaporation ponds are used to extract
potassium from the mineral rich solution. The potassium extracted is used for products like
fertilizer.
Storage
Evaporation ponds are also used to dispose of
brine from
desalination plants.
Evaporation ponds at contaminated sites remove the water from
hazardous waste, which reduces its weight and volume and allows it to be more easily transported and stored.
Evaporation ponds are used to prevent run off agricultural wastewater contaminants like
,
and salts from entering bodies of water they would normally flow into.
Design and operation
Location of the evaporation pond should be considered for optimal results. Evaporation will be higher in places with high amounts of solar radiation, high temperatures, and low
wind levels. Since evaporation ponds operate best with greater surface area of evaporation, large amount of land is required, so low quality, low cost land is better
A shallow pond covering greater surface area will result in faster rates of evaporation.
An evaporation pond has shallow depths and, to prevent contamination of the environment from its content, a range of pond liners are used, categorized as geomembrane, constructed bentonite clay, or natural clay.
Health impacts
Evaporation ponds, when not maintained, may leak
Contamination contents into the environment which directly effect human and animal health.
The contents within the evaporation pond can be found to contaminate surrounding soil and surrounding water sources. Contaminated water can contain sources of chemicals and hard metals like
selenium which in accumulation can be toxic when ingested by humans or animals.
Employees working directly with the evaporation ponds may experience acute health conditions like dry skin and
irritation from close contact of contents within the pond.
Environmental impacts
Evaporation ponds pose a threat to environmental sustainability because resources like water, land, and minerals are rapidly used at large scales. These resources are limited in nature. An increasing demand for extracted products and treated wastewater will result in evaporation ponds expanding and related issues worsening until the depletion of these resources.
Evaporation ponds are found to increase green house gas emissions and therefore contribute to environmental issues like warming of the planet and ocean acidification. As the pond evaporates, it carries with it volatile pollutants into the air.
Technology
Advancing technology has made evaporation pond design and implementation more effective. With new resources such as fabric evaporations for salt-tolerant plants, the ponds' costs and environmental impacts can be mediated.
See also
