Abstract
Efficiency of Pollution Removal in Preliminary Settling Tanks of Household Wastewater Treatment Plants in the Roztocze National Park
Highlights
According to the Polish Norm PN-EN 12566–3: 2016–10, a domestic wastewater treatment plant is a facility that can serve up to 50 people
Domestic wastewater is wastewater from homes, collective housing, and public buildings originating from the use of toilet and other household facilities, and wastewater of a similar composition originating from these buildings [Water Law 2017]
The three- and four-chamber primary settling tanks we studied had mean total suspended solids (TSS) removal efficiencies of 51% and 68%, respectively
Summary
According to the Polish Norm PN-EN 12566–3: 2016–10, a domestic wastewater treatment plant is a facility that can serve up to 50 people. Every domestic wastewater treatment plant should consist of at least two stages of treatment: mechanical and biological. Wastewater is first treated mechanically in a primary settling tank, where sedimentation and flotation processes as well as anaerobic sediment stabilization take place [Dymaczewski et al 2011]. The effluent from the settling tank is treated biologically under aerobic conditions in sand filters, biological beds, activated sludge chambers, hybrid reactors (activated sludge + biological bed), or constructed wetlands [Jóźwiakowski 2012]. Treated wastewater can be discharged into the ground (through a soakaway well or a drainfield), water facilities, or surface waters [Jawecki et al 2016]
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