The revenue of sewage treatment plant mainly comes from the sewage fee paid by the factory, and the administration of the sewage treatment plant belongs to the departments of water affairs and environment.
The smallest wastewater treatment plant investment in about 50W, can only treat 50T of water a day, it is estimated that the income will be very small. Generally want to revenue sewage treatment plant to try to build a little larger, because sewage charges are very low, mainly to do "wholesale", small profits and high sales. Whether or not there is government financial assistance depends on the local environmental regulations, which vary from place to place.
You want to get involved in water, we must have sewage treatment operation qualification, this is the provincial Environmental Protection Bureau approved it, if the Class A still have to be approved by the National Bureau of sewage treatment is now a very popular mode, BOT is the construction - delivery - operation, these are the construction of Party B, the government is the Party A, and then the government signed a contract to pay for the price of tons of sewage treatment costs of Party B. However, there are also enterprises so that the operation of the sewage volume is more and more, because the sewage volume is more and more. Because the volume of sewage is the more there is a scale effect, so the small sewage treatment plant investment value is low, there is also the operating time is generally 20 years.