| 主权项 |
1. A method of treating wastewater, comprising:
flowing a wastewater stream through at least one anaerobic settling and treatment tank, wherein the anaerobic settling and treatment tank comprises:
a bottom and at least one sidewall,an influent end and an effluent end in liquid communication with a control volume in the tank, wherein the control volume is configured to retain wastewater; wherein the tank further comprises a baffle configuration, including:
a baffle located adjacent to the influent end and configured to distribute the flow of wastewater into the tank; andat least one member configured between the baffle and the effluent end wall, wherein the member configured to promote mixing and flow distribution of the wastewater, anda settling promoter configured along the effluent end sidewall and configured to promote settling of solids prior to discharge from the effluent end;wherein the baffle configuration is configured to flow wastewater through the tank along at least one predetermined flow path at a surface overflow rate of at least 0.25 m/hr; and treating the wastewater in the anaerobic settling and treatment tank via the baffle configuration and surface over flow rate to remove at least 75% of organics from the wastewater stream to provide a low organics wastewater stream; flowing a low organics wastewater stream into an engineered wetland from the anaerobic settling treatment tank effluent, wherein the engineered wetland is in liquid communication with the anaerobic settling and treatment tank; aerating the low organics wastewater stream, wherein aerating the low organics wastewater is sufficient to sustain aerobic bacteria; treating the low organics wastewater stream in the engineered wetland to remove:
ammonia from the low organics wastewater to a content of not greater than 8 ppm, wherein the engineered wetland comprises a pore water hydraulic retention time of not greater than 4 days; discharging a treated water stream from the engineered wetland. |
