Volatility of heavy metals during incineration of tannery sludge in the presence of chlorides and phosphoric acid

Waste Management & Research : the Journal of the International Solid Wastes and Public Cleansing Association, ISWA
P TangF Y Xia

Abstract

Knowledge of the behaviour of heavy metals in the combustion process is a most important factor in selecting disposal alternatives for waste materials. Accordingly, in this work, the vaporization behaviour of highly concentrated heavy metals (Pb, Zn, Cu and Cr) in tannery sludge were investigated experimentally. The sludge was spiked with various chlorine compounds (i.e. PVC, FeCl3, CaCl2 and NaCl) and pre-treated with phosphoric acid in order to evaluate the capacity of enhancement and weakening of the volatility of the heavy metals contained in tannery sludge. The experimental results show that the vaporization percentages increased with increasing ratio of Cl/sludge and temperature, and the accelerating and increasing effect of the addition of chlorides on the vaporization percentage of heavy metals was dependent on the release capacity of chlorine radicals. The vaporization percentages of lead and zinc increased by 15-20%, whereas those of copper and chromium increased by only about 3 and 10% at 800 degrees C. However, heavy metals were not expected to be completely released in the combustion process in spite of the high ratio of Cl/sludge. Alternately, heavy metals contained in tannery sludge can be immobilized effectively...Continue Reading

References

Jul 23, 2003·Waste Management & Research : the Journal of the International Solid Wastes and Public Cleansing Association, ISWA·Moo Been ChangHsin Yi Lin
Nov 25, 2004·Journal of Hazardous Materials·Blandine BournonvilleGuy Depelsenaire
Jul 5, 2005·Journal of Hazardous Materials·Jing-Yuan WangJoo-Hwa Tay
Apr 20, 2006·Journal of Hazardous Materials·Arnault LassinLaurent Bailly
Jul 11, 2006·Waste Management·Paul T ImhoffRamin Yazdani
Jul 26, 2006·Journal of Hazardous Materials·Ching-Hong HsiehChing-Lung Chen
Aug 11, 2007·Journal of Hazardous Materials·Gaston HoffmannMelania Kaszás Savos

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Citations

Mar 29, 2013·Environmental Science and Pollution Research International·Ping TangZhengmiao Xie
Sep 3, 2009·Waste Management & Research : the Journal of the International Solid Wastes and Public Cleansing Association, ISWA·Jun HanMitsuhiko Hata

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