Conventional water treatment plant generates two types of process wastes, filter back wash water and sludge. Characteristic studies of these wastes reveals that it contains high solids content, metals and bacteriological concentration, which are generally more than permissible disposable standards. Direct disposal of these wastes in to natural stream pollutes the receiving streams, affects huma...

The co-disposal of densified sludge and wastepaper in a co-current flow packed bed gasifier represents new application of the thermal gasification process. Advantages of this technolo a gy include lower costs than other incineration or pyrolysis technologies, simple construction and operation, and the ability to a variety of fuels including agricultural wastes and other b.iomass materials in ad...

This paper deals with thermal drying of wastewater sludges, whose management will become crucial in the forthcoming years. Sludges collected after mechanical dewatering in 5 different WWTPs are submitted to the same convective drying treatment in order to try finding some relations between the drying behaviours, the type of effluent and wastewater treatments. Results show dearly sludge drying r...

With the objective of suppressing dioxins and furans (PCDD/Fs) emission in municipal solid waste incineration plants (MSWI), different chemical inhibitors have been tested. Among these inhibitors, nitrogen sulphur compounds can significantly suppress PCDD/Fs formation via de novo synthesis, which gives very interesting results with little capital investment. In recent years, possibility using r...

The seafood processing industries produce large amounts of wastewater sludge in Thailand. Most is dewatered and then sent directly to landfills without utilization nor resource recovery. dried sludge, having a gross calorific value (GCV) higher than 21.9 MJ/kg, might be worthwhile utilize as refuse-derived fuel. However, the critical obstacle its high moisture content 87.4 wt%. This study inves...