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Missouri River Wastewater Treatment Facility
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Missouri River Wastewater Treatment Facility
Headworks Facilities
Headworks Facility consists of screens, washer/compactor units, grit removal chamber, and Peak Flow Storage Basins.
Flows above 80 mgd are diverted to the Peak Flow Storage Basins.
Headworks Facilities
Fine Screens
Currently, Missouri River Wastewater Treatment Facility has 5 band screens for large objects removal in the influent wastewater. The capacity per unit is 38 million gallons per day.
Large objects collected go to the washer/compactor units for further processing.
Fine Screens
Washer/Compactor Unit
Objects collected on the band screens are washed and ground, then dewatered, and compacted by units. The maximum capacity per unit is 150 cubic feet per hour.
Screenings from washer/compactor units are collected in dumpsters and transported to landfill.
Washer/Compactor Unit
Grit Removal
Grit chambers are designed for grit and heavier solids removal from the wastewater. Currently, Missouri River WWTF has 4 tanks. Each unit's capacity is 47.5 million gallons per day.
After the collection, grit is pumped to the grit classifiers. The grit is then washed and dewatered and discharged into a dumpster and transported to landfill.
Grit Removal
Peak Flow Storage Basins
Secondary Treatment
Secondary treatment includes activated sludge, final clarifiers (13.33 mgd each) and UV disinfection.
Secondary Treatment
The Low Lift Pump Station sends flow to the secondary facilities from the Primary Clarifiers.
Activated Sludge
Activated Sludge process is a type of wastewater treatment process for treating sewage or industrial wastewater using aeration.
Activated Sludge
The system was designed to allow for modification or expansion in the future for incorporation of several stages of biological nutrient removal as required. The system is designed to treat wastewater flow to 30 million gallons per liter for biological oxygen demand and 30 million gallons per liter for total suspended solid.
Equalization Tank
The equalization tank is located downstream of the primary clarifiers at the Low Lift Pump Station. In this tank, excess flow is stored before treatment in the activated sludge system.
Primary Treatment
Primary treatment facilities at the Missouri River plant consist of pre-aeration tanks followed by primary clarifiers. Primary treatment is sized to handle 80 million gallons per day.
Primary Treatment
Pre-Aeration Basins
In Pre-aeration Basins, air is introduced into the wastewater to keep solid in suspension, strip volatile gases and raise the dissolved oxygen levels. Recently, three Pre-aeration Basins are operating. The peak capacity per unit is 26.7 million gallons per day.
Pre-Aeration Basins
Primary Clarification
Solid and scum are collected from the clarifiers by a rotating rake and skimmer system. Four clarifiers are normally in service. The capacity of each one is 20 million gallons per day.
Primary Clarification
Secondary Sludge
Return Activated Sludge (RAS) wet well pumps the RAS to the primary effluent line upstream of the Primary Effluent Flow Splitter and finally to the aeration basins.
Waste Activated Sludge (WAS) is pumped from a WAS Holding Basin to the rotary drum thickeners for thickening.
Secondary Sludge
Sludge Final Treatment
Anaerobic digestion is used for sludge stabilization. Digested sludge goes to the centrifuges. Dewatered sludge is pumped and discharged to two sludge cake storage silos allowing for sludge to be trucked and disposal.
Sludge Final Treatment
Anaerobic Digestion
Methane Gas
Methane gas from the sludge digestion process is collected and stored in two flexible membrane digester covers. The gas is cleaned in a gas cleaning system, before being used in electricity generation.