Hydrogen chloride is a colorless gas at room temperature and has a pungent smell. It is
usually used as a chemical reagent in the manufacture of a variety of
industrial chemicals, fertilizers and dyes. However, it’s also one of the most
troublesome gases and air pollutants due to its great corrosive and toxic
nature and high solubility. And it usually comes from burning and incinerating
of the industrial waste. For according to nowadays’ technology, burning is a very
common method of handling the industrial waste, the appearance of hydrogen
chloride gas is inevitable, which makes the removal of HCI gas be the study
focus of scientists and experts of related areas.
In present, calcium hydroxide
and calcium carbonate at low temperatures (below 300˚C) are more often used to
remove the HCI gas, but they lead to the evolution of some chemicals and cause
hot corrosion of the incinerator. So a new method which removes the HCI gas via
paper sludge would be a more welcome choice.
As some
studies shown, the amount of paper sludge, an industrial waste of papermaking
industry, is increasing annually, which makes it one of the most serious
environmental problems and attracts more attention of scientists and experts.
In the past, most part of the paper sludge is usually disposed in the open
dumps or landfills. However, for the reduction of landfill places, the cost of
disposing paper sludge is increased.
So using the paper sludge to
remove the HCI gas can achieve a win-win situation, which not only solves the
problems of disposing paper sludge and reduces the cost of removal of HCI gas,
but also improves the environment effectively.
In the future, more similar
methods are expected to be presented to reduce the environment pollution. And fundamentally
speaking, we should learn how to produce less pollution to protect our living
environment.
Article by Takaaki Wajima, from Chiba
University, Chiba, Japan.
Full access: http://mrw.so/4eSR11
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Image by Newtown grafitti, from Flickr-cc.
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