Effects of Hydrothermal Process on the Nutrient Release of Sewage SludgeXiao Han Sun1*,Hiroaki Sumida2 and Kunio Yoshikawa1
- *Corresponding Author:
- Xiao Han SUN
Department of Environmental Science and Technology
Tokyo Institute of Technology
Yokohama 226-8502, Japan
Received Date: October 03, 2013; Accepted Date: October 28, 2013; Published Date: November 01, 2013
Citation: Sun XH, Sumida H, Yoshikawa K, Sumida H, Yoshikawa K (2013) Effects of Hydrothermal Process on the Nutrient Release of Sewage Sludge. Int J Waste Resources 3:124.doi:10.4172/2252-5211.1000124
Copyright: © 2013 Sun XH, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Hydrothermal treatment has demonstrated the ability of improving the dehydration and drying performances of sewage sludge, as well as shown its suitability for producing fuel. On the other hand, because of the abundant nutrient matters in sewage sludge, the produced liquid may be used as the liquid organic fertilizer. In this work, the effect of the hydrothermal treatment on the nutrient behavior in sewage sludge was investigated. The effects of the reaction temperature (180-240°C), and the reaction time (30-90 min) were investigated, and both of solid and liquid products were analyzed individually. The results showed that 40%-70% of nitrogen, 50%-70% of potassium and 10%-15% of phosphorus in sewage sludge could be dissolved into the liquid product, and that the solubilization was highly influenced by the temperature and the reaction time during the hydrothermal process. The hydrothermal treatment can effectively transport nutrient components in sewage sludge into the liquid product.