Water, the most abundant compound on earth, is used by many
industries. When you use computers, wear cotton shirts, drink beverages you are
actually consuming water. The industries which are most water thirsty are
listed below. In terms of direct water usage, agriculture and
power-generation industries top the list, which together are responsible for 90 percent of
direct water withdrawals.
1.
Agriculture
Agriculture is the major water consumer of all the
industries. For India more than 90% fresh water usage is in agriculture industry.
The room for
improvement in water usage efficiency is also in this industry. Using modern
techniques like sprinter irrigation, drip irrigation etc can help to make use
of water efficiently. In developing countries huge amount of water can be saved
by simple improvements in the method of irrigation.
2.
Power
generation
Generation of electricity is another bigg consumer of water.
Ultimately, it takes a staggering 95
liters of water to produce one kilowatt-hour of electricity, according to Tamim
Younos, research professor of water resources at Virginia Tech.
Pumping oil, cooling the power plant, removing pollutants
from power plant exhaust, generating steam to run turbines, and washing away
residue after fossil fuels are burned all involve water usage.
All sources of power generation are not equal in water
consumption efficiency. For example natural gas is the most efficient source of
energy in terms of water consumption.
3.
Food
processing
Huge water is used to wash and rinse fruits, vegetables and meat.
Food processing industry uses water to
1.
Wash raw food,
2.
washing after steaming/peeling/ size reducing,
3.
Balanching
4.
Filling
5.
Sanitation and plant cleaning
Half of the water used in the fruit and vegetable
sector is for washing and rinsing
4.
Textile
and garment industry
Textile and garment industry is very water intensive. Most
of the water used is in wet processing and dyeing fabrics. The textile industry
uses 100 liter of water to process only 1 kg of textile fabrics.
5.
Meat production
According to a study by the UNESCO Institute for Water Education, conducted between 1996 and 2005, “29 percent of the total
water footprint of the agricultural sector in the world is related to the
production of animal products.”
It takes more than 1,800 gallons of water to produce 1
pound of beef
6.
Semiconductor
manufacturing
Semiconductor Manufacturing Plants can use as much water as
a small city. These plants use water in washing the silicon wafers with ultra pure
water. One manufacturing plant uses anywhere between 2 to 4 million gallons of
very, very pure water— ultrapure water—per day, and that is roughly equivalent to the water usage of a city of around 40,000 people.
Ultrapure
water is a term in the semiconductor industry to emphasize the
fact that the water is treated to the highest levels of purity for all
contaminant types, including: organic and inorganic compounds; dissolved and
particulate matter; volatile and non-volatile, reactive and inert; hydrophilic
and hydrophobic; and dissolved gases.