Sewage sludge treatment using microwave-enhanced advanced oxidation processes with and without ferrous sulfate addition
✍ Scribed by Kwang V Lo; Ping H Liao; Gui Q Yin
- Publisher
- Wiley (John Wiley & Sons)
- Year
- 2008
- Tongue
- English
- Weight
- 112 KB
- Volume
- 83
- Category
- Article
- ISSN
- 0268-2575
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✦ Synopsis
Abstract
BACKGROUND: Microwave‐enhanced advanced oxidation processes with and without the addition of ferrous sulfate (MW/H~2~O~2~/Fe^2+^‐AOP and MW/H~2~O~2~‐AOP respectively) were studied for reduction of solids and solubilisation of nutrients from secondary sewage sludge.
RESULTS: For the MW/H~2~O~2~/Fe^2+^‐AOP the yields of solubilisation of orthophosphate and ammonia decreased with increasing temperature. The best results (88.1 mg L^−1^ for orthophosphate and 22.7 mg L^−1^ for ammonia) were obtained at a treatment temperature of 40 °C. In contrast, the MW/H~2~O~2~‐AOP had an advantage when it was operated at higher temperatures of 60 and 80 °C. The highest yields of solubilisation were obtained at 60 °C for orthophosphate (81.1 mg L^−1^) and at 80 °C for both ammonia (35.0 mg L^−1^) and soluble chemical oxygen demand (1954 mg L^−1^). Over the temperature range used in this study, the MW/H~2~O~2~‐AOP gave a better performance than the MW/H~2~O~2~/Fe^2+^‐AOP.
CONCLUSION: For sewage sludge treatment the MW/H~2~O~2~‐AOP is more effective than the MW/H~2~O~2~/Fe^2+^‐AOP in terms of solid reduction and nutrient solubilisation. It will also be more cost‐effective, as it does not require iron addition in the process. Copyright © 2008 Society of Chemical Industry