Experimental study of flue gas desulfurization using landfill leachate

✍ Scribed by Sang-lan, Ding ;Shijun, Su ;Haiqing, Wan ;Jiahua, Zhu

• Publisher: American Institute of Chemical Engineers
• Year: 2007
• Tongue: English
• Weight: 415 KB
• Volume: 26
• Category: Article
• ISSN: 0278-4491
• DOI: 10.1002/ep.10171

✦ Synopsis

Abstract

Because of the complexity of landfill leachate's composition, the reaction mechanism of SO~2~ in flue gas with landfill leachate was studied. The experimental results indicated that the factors influencing SO~2~ absorption efficiency using landfill leachate as the scrubbing medium were, in decreasing order of importance, pH, Fe^2+^, Mn^2+^, and Cl^−^ as catalysts and the concentration of toluene and ethanol. Experiments showed that the pH of landfill leachate was the key factor governing both SO~2~ absorption and ammonia stripping. With the initial pH of 8.5, the terminal pH 6.0 and L/G ratio 3 L/m^3^, experimental results showed that average absorption efficiency of SO~2~ and the stripping efficiency of ammonia were 85 and 44%, respectively. The use of catalysts such as Fe^2+^ and Mn^2+^ was important for SO~2~ absorption when the pH value was below 7.0. The catalytic activity of Mn^2+^ was greater than that of Fe^2+^ although the reaction steps were very similar. Ethanol inhibits HSO~3~^−^/SO~3~^2−^ oxidation. The HSO~3~^−^/SO~3~^2−^ oxidation process improves the solubility of organics such as toluene in the leachate. The solute products of organics were water‐soluble and biodegradable and could be used as substrates for bacteria in the post biotreatment. The factorial experiment results showed the effect of Cl^−^, Fe^2+^, and Mn^2+^ as catalysts on the HSO~3~^−^/SO~3~^2−^ oxidation has a greater positive impact than ethanol's inhibitory effect on the HSO~3~^−^/SO~3~^2−^ oxidation. © 2006 American Institute of Chemical Engineers Environ Prog 26:25–32, 2007