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A Win-Win Result: To Remove HCl Gas Using Paper Sludge

   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
Image by Newtown grafitti, from Flickr-cc.




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