Small sewage treatment plant investment costs

According to the calculation of 30,000 people, each person's daily water consumption in the 120L, the coefficient of production of pollution to take 0.85, the design of 3060 cubic meters / day of sewage treatment plant, if to achieve the first class A standard, the investment cost of about 6.5 million (not counting the cost of the land), the civil construction of 50 years, the depreciation of equipment according to the five-year period, the recovery of the cost of the general calculation of 15-20 years.