IBB - Institute for Biotechnology and Bioengineering, Centre of Biological Engineering, University of Minho, Campus de Gualtar, 4710 - 057 Braga, Portugal.
J Environ Manage. 2011 Mar;92(3):749-55. doi: 10.1016/j.jenvman.2010.10.035. Epub 2010 Oct 30.
Fenton treatment (Fe(2+)/H(2)O(2)) and different ozone-based Advanced Oxidation Processes (AOPs) (O(3), O(3)/OH(-) and O(3)/H(2)O(2)) were evaluated as pre-treatment of a mature landfill leachate, in order to improve the biodegradability of its recalcitrant organic matter for subsequent biological treatment. With a two-fold diluted leachate, at optimised experimental conditions (initial pH 3, H(2)O(2) to Fe(2+) molar ratio of 3, Fe(2+) dosage of 4 mmol L(-1), and reaction time of 40 min) Fenton treatment removed about 46% of chemical oxygen demand (COD) and increased the five-day biochemical oxygen demand (BOD(5)) to COD ratio (BOD(5)/COD) from 0.01 to 0.15. The highest removal efficiency and biodegradability was achieved by ozone at higher pH values, solely or combined with H(2)O(2). These results confirm the enhanced production of hydroxyl radical under such conditions. After the application for 60 min of ozone at 5.6 g O(3)h(-1), initial pH 7, and 400 mg L(-1) of hydrogen peroxide, COD removal efficiency was 72% and BOD(5)/COD increased from 0.01 to 0.24. An estimation of the operating costs of the AOPs processes investigated revealed that Fe(2+)/H(2)O(2) was the most economical system (8.2 € m(-3)g(-1) of COD removed) to treat the landfill leachate. This economic study, however, should be treated with caution since it does not consider the initial investment, prices at plant scale, maintenance and labour costs.
芬顿处理（Fe(2+)/H(2)O(2））和不同的基于臭氧的高级氧化工艺（AOPs）（O(3）、O(3)/OH(-)和 O(3)/H(2)O(2））被评估为成熟垃圾渗滤液的预处理方法，以提高其难生物降解有机物的可生物降解性，以便随后进行生物处理。对于经过两倍稀释的渗滤液，在优化的实验条件下（初始 pH 值 3、H(2)O(2)与 Fe(2+)摩尔比为 3、Fe(2+)剂量为 4 mmol L(-1)，反应时间为 40 min），芬顿处理去除了约 46%的化学需氧量（COD），并将五日生化需氧量（BOD(5））与 COD 的比值（BOD(5)/COD）从 0.01 提高到 0.15。在较高 pH 值下，臭氧单独或与 H(2)O(2)结合使用时，可实现最高的去除效率和生物降解性。这些结果证实了在这种条件下羟基自由基的生成得到了增强。在初始 pH 值为 7、过氧化氢浓度为 400 mg L(-1)、臭氧流量为 5.6 g O(3)h(-1)的条件下，应用臭氧 60 min 后，COD 的去除效率达到 72%，BOD(5)/COD 从 0.01 增加到 0.24。对所研究的 AOPs 工艺的运行成本进行估算表明，Fe(2+)/H(2)O(2)是处理垃圾渗滤液最经济的系统（8.2 € m(-3)g(-1)去除的 COD）。然而，应该谨慎对待这种经济研究，因为它没有考虑初始投资、工厂规模的价格、维护和劳动力成本。
