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Water Practice & Technology © IWA Publishing 2006 |
doi10.2166/wpt.2006.062
Experimental Study on Removal of Alkali-Metal and Incineration of High Concentration Organic Liquid Wastes
J.Y. Ma1,2, Z.Y. Ma2, H.L. Jia2, J.H. Yan2, M.J. Ni2, K.F. Cen2
1Department of City Construction, Zhejiang College of Construction, Hangzhou 311231, China
2State Key Laboratory of Clean Energy Utilization (Zhejiang University), Hangzhou 310027, China
ABSTRACT
To resolve the operational problems such as agglomeration, fouling, sintering and corrosion due to low-melting eutectics formed by alkali and alkaline-earth metals in the wastewater, evaporation-crystallization method was used to remove alkali and alkaline-earth metals and decrease demand of assistant fuel before incineration. Salty concentrated liquid was recycled to be re-evaporated. The removal efficiency of Na+ in NaCl is 99.88%. The ratio of organic compounds volatilization is higher than 99.00%. Organic waste steam was incinerated in fluidized bed combustion (FBC). Combustion efficiency is influenced by bed temperature and air flux. As the temperature is increased from 650?C to 900?C at the air flux of 20m3/h, combustion efficiency is increased from 88.74% to 99.90%. When the air flux is increased from 20m3/h to 30m3/h, combustion efficiency is decreased, especially at the lower temperature. Reduction of the concentration of organic compounds can decrease the heat value of the steam, and then, reduce combustion efficiency.
Keywords: Alkali metals; Combustion efficiency; Desalination; FBC; Incineration; Organic liquid waste
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