Technical overview of
DEWATS Modules
Technical overview
Septic tank / SettlerAnaerobic Baffled Reactor
Biogas settler
Anaerobic FilterPlanted Gravel Filter
Pond Systems
OR
Technical overview
Septic tank / settler
• Consists of min. 2 to 3 compartments
• Settling / sedimentation tanks for retaining particle
• Outlet is free from settleable solids
• Dissolved & suspended matter passes untreated to next treatment stage
• Efficiency 25% to 40%
• Desludging period 1 to 3 yrs - depends on sludge storage
Technical overview
Biogas settler
• Sedimentation tanks for retaining particles
• Biogas is formed due to digestion of settled organic matter in anaerobic condition
• Outlet is free from settleable solids
• Dissolved & suspended matter passes untreated to next treatment stage
• Efficiency 25% to 40%
• Desludging period 1 to 3 yrs, depending on sludge storage
• Biogas production: Gas storage is needed (gas tight)
Technical overview
Anaerobic baffle reactor
• Treatment in absence of oxygen (anaerobic)
• Wastewater passes through a series of chambers in up-flow form
• Sludge (activated) at the bottom of each chamber
• Further treatment (degradation) of suspended & dissolved solids by available bacteria
• Efficiency 75% to 85%
• Desludging needed only if excess sludge (activated) is generated
Technical overview
Anaerobic fixed bed filter
• Treatment occurs in absence of oxygen (anaerobic)
• Wastewater passes in a series of chambers through the filter material in up-flow form
• Filter is made out of gravel, slag or plastic elements
• To avoid plugging pre-treatment (sedimentation) is necessary
• Efficiency 75% to 90%
• Desludging is needed only if excess sludge (activated) is generated
Technical overview
Planted gravel filter
• Treatment occurs in presence of oxygen (aerobic)
• Treatment concentrates more on removal of smell & color
• Planted gravel filter consist of plants (reeds) & filter materials (graded gravels, river pebbles)
• Filter is permanently soaked (up to 50 cm from bottom) in water
• Flow direction is horizontal
• Suitable for pre-treated wastewater
internal water level
inflow manhole
upper sand layer central outlet shaft
final outlet
cross distribution trench filled with rocks
main filter body filled with coars gravel cross collection
trench filled with rocks
perforated pipe connected to
swivel pipe for adjustable height
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Technical overview
Flow principle of horizontal filter
Inlet
Slope protection with gravel
Outlet Pre- treatment
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