Sam,
From a Veolia PR:
The sludge treatment plant will be commissioned in 2013. The waste water sludge, mainly collected from Stonecutters Island Sewage Treatment Works, the largest treatment facility in Hong Kong (also with Arup as its consultant), will be incinerated by fluidised bed incinerators. It will evaporate all of the water content in the sludge and burn 90% of the remaining solid component, thus the capacity required in landfills for sludge disposal will be greatly reduced.
The facility will provide Hong Kong with an iconic landmark building that is respectful of its environment. It will be entirely self sufficient; generating and exporting power to the regional electricity grid and processing sea water through a desalination plant. Rainwater will be collected for non-potable use, and waste water will be treated and re-used on site with a very low impact on the environment.
The above describes what is to happen at the worlds largest sludge treatment plant in Hong Kong. The sludge will be dewatered and incinerated.
