Waste incineration; treatment of waste; generation of electrical power; treatment of water, sewage and industrial wastewater; recycling of human waste and sludge; water treating; waste water treatment; generating energy or resource from organic waste, or treatment of leachate from final disposal site; rental of water filtration units for commercial use; rental of equipment for prevention of water contamination; rental of water treatment equipment such as pure water production system, water pu...