The principle of longjiang cadmium polluted water treatment

Domain expert authority water treatment technology in China environmental science and engineering, tsinghua university professor zhang xiaojian in guangxi dragon river cadmium pollution treatment, on January 31, late Zhang Xiao living in guangxi liuzhou to explain to the media dragon river cadmium pollution disposal method and principle.

the water treatment technology is mainly adopts 'weak alkaline chemical precipitation emergency' technique to remove cadmium, the principle of this technology is put in the caustic soda and lime into the river, increase the weakly alkaline PH make water and make the cadmium insoluble in water and separate from the water, cadmium tiny small particles to form carbonic acid. And into the river on the polyaluminium chloride coagulant, in order to make tiny particles suspended in the water solidified into larger particles and precipitation to the bottom of the river. Polyaluminium chloride is the most commonly used in water treatment purification tablets, the water plant on the acid and alkali are food grade.

it is reported, saying a process already in December 2005, beijiang cadmium pollution event has been successfully used in guangdong province.