Zero Liquid Discharge (ZLD) System is proving to be Key Weapon in Handling Chemical Waste from Textile Industry
Wastewater is one of the most prevalent challenges in water
treatment plants. Since the use of hazardous chemicals in the textile and
apparel sector pollutes the water, it has become imperative for government
authorities to reduce curb the pollution and implement stringent regulations on
wastewater discharge. Zero
liquid discharge (ZLD) is a process developed to get rid of all the harmful
liquid wastes in a system to create clean, freshwater. The main objective of
ZLD is to reduce waste fluid effectively and produce safe and suitable water
for use, thus being good for the environment and saving money. This type of
treatment has been in demand for quite some time and is slowly finding
acceptance by most users.
Liquid waste comprises chemicals, solid matter, and even foodstuff
which is not removed during the normal functioning of a system such as in the
case of industrial plants. All these materials have to be removed during a
regular maintenance routine for better functioning of the plant and for
avoiding pollution of water sources. There are special-purpose filtration
devices that can be bought easily and these are used for the purpose of
purification of both liquids and solids. For instance, in the case of chemical
wastes, these are known as sub-micron filtration devices, multi-stage water
filters, point of use filters, sub-micron filters, etc. Some industrial plants
are even fitted with sub-micron filters for both solids and liquids.
In some cases, the liquid wastes can be completely removed from
the water without any intervention. However, in many other instances where
there is heavy usage of chemical substances, it becomes mandatory to have a
special filtration device installed at the point of use. In most of these
cases, the liquid wastes cannot be removed entirely. These devices have
different types and sizes to suit the size and volume of the fluid waste so
that the proper quantity of water is produced without any problem. Countries
like South Korea, Japan, and the U.S. are significantly investing in zero liquid
discharge systems. For instance, in South Korea, key manufacturers are working
on a Flue gas desulphurization zero liquid discharge project.
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