Beijing Drainage Group Xiaohongmen reclaimed water utilization project with 60 million tons/day used 3sets of 15kg/h and 3 sets of 30kg/h large ozone generators. By the way of international competitive bidding, Guolin successfully won the bidding in one fell swoop.

Beijing Xiaohongmen sewage treatment plant is one of large-scale municipal wastewater treatment plants built in downtown of Beijing. The engineering design scale is 60 million tons / day, the crest factor of design flow rate is 1.3. Treated reclaimed water will enter Liangshui River for Beijing City rivers and lakes replenishment and also for industrial reuse and urban miscellaneous applications. According to the main use of the outlet water, the design of the outlet water quality met the requirements of the quality of reclaimed water, and part of water quality met the "Surface Water Environment Quality Standard" IV class water standards.

The reclaimed water treatment process is "Two-stage Biological Aerated Filter + membrane filtration + ozone decolorization + sodium hypochlorite disinfection", ozone is in the process to ensure the color could be reduced to 15 times from 30 times.