The wastewater companies listed in SGX are Hyflux, Asia Environment, Sinomem, Epure and Bio-treat and they are highly dependent on the China market, with the exception of Hyflux which has diversified to MENA ( Middle-east and North Africa).
In terms of treatment methodology, Sinomem and Hyflux mostly focus on the use of membrane technology while the rest mostly focus on the use of the biological treatment. (Note: mostly is used as often they combine both membrane and bio treatments)
In very very general terms, membrane technology is generally used in pharmaceutical or electronics industry to filter out the small stuff or to recycle water, or desalinate seawater into drinking water. The biology method is generally used to treat urban water before discharging into the environment. Read more...