Protection of water resources and reduction of water consumption is one of the most critical environmental goals in today's cities. Treatment of wastewater resulting from daily life activities is an indispensable part of these goals. Therefore, increasingly strict regulations make it mandatory for municipalities and local governments to establish domestic wastewater treatment plants.
Groundwater, surface water and seas are under pollution pressure due to untreated wastewater. Properly designed and operated wastewater treatment plants are needed to prevent this pollution.
PİLSAN CONSTRUCTION designs and builds turnkey wastewater treatment plants for every population scale, from small settlements to large cities. We serve with package-type solutions to urban-scale reinforced concrete facilities, with technologies specific to the site and needs.
The main purpose of wastewater treatment is to minimize the effects on public health and the environment in the receiving environment where discharge will be made. In this context, typical treatment stages are:
Screen
Grit-oil trap
Pre-settling
Removal of organic matter
Removal of nutrients (nitrogen-phosphorus)
Suspended solids removal
Advanced reduction of nitrogen-phosphorus
Filtration/membrane
Pathogen removal with UV
Pathogen removal with chlorine
Which parameter will be removed and how much is determined according to the current regulations. In Turkey, the Water Pollution Control Regulation (SKKY) and related regulations define discharge standards depending on population and receiving environment.
In modern cities, the source distribution of domestic wastewater is approximately: 40% toilet/sink, 30% bath, 15% laundry, 10% kitchen, 5% other uses. In a healthy sewer system where industrial wastewater is not mixed, BOD (Biochemical Oxygen Demand) is generally in the range of 200-450 mg/L. These values may vary according to the socio-economic structure of the settlement.
Continuous flow Classical Activated Sludge (CAS) and SBR (Sequential Batch Reactor) processes are common, flexible and proven solutions.
Economic solution for medium-high flows
Process variations for nitrogen-phosphorus removal
Layout and energy optimization
Additional stages for strict standards in discharge or reuse targets:
Sand/Multimedia filter, disk filter
Chemical phosphorus removal, coagulation-flocculation
UV/chlorine disinfection, activated carbon
Modern biological processes for projects where compactness and high output quality are sought:
MBR (Membrane Bioreactor): Highest output quality, suitable for recovery
MBBR (Moving Bed Biofilm Reactor): Can tolerate high shock loads, scales modularly