Sewage pumping stations and their equipment
CF SBR ‘Continuous Flow Sequencing Batch Reactor’ technology presents novel approach to sewage treatment in comparison with traditional sequencing batch reactors based on biological wastewater treatment with the use of active sludge. Biological wastewater treatment is conducted in aerobic-anaerobic conditions in transformation process of carbon, nitrogen and phosphate compounds.
CF-SBR reactor consists of a single tank and does not require primary or secondary clarifier. In comparison with traditional SBR technology, reactor can be filled continuously during the cycle. At the same time the construction prevents mixing raw sewage with already treated fluid, and proper measuring equipment enables precise adjustment of the cycle to current load. The reactor allows to conduct all the technological processes without the need to provide separate chambers (biological phosphorus removal, denitrification, nitrification ones).
The technology ensures overall reduction of contaminants and the end product is stable, and not susceptible to any changes of the contamination load or its quantity. Devices necessary for the process were also limited to absolute minimum. CF-SBR reactors may be utilized in municipal and industrial sewage treatment plants.
The list of equipment for an individual reactor:
- air distribution system
- aeration system
- pumping agitator
- sledge pump
- decanter
- measurement unit
CF-SBR sewage treatment phases
1.Aeration
The entire reactor is aerated via aeration grates. The phase is responsible for carbon reduction and nitrification. The length of the phase is time dependent and intensity of aeration is regulated by the indications of oxygen probe that allows to adjust intensity of the process to the current sewage load and to reduce electricity significantly.
2. Sedimentation
Air blower causes flocs to fall to the bottom of the reactor and sewage at the top to clarify. At the same, time in the sedimentation zone, anoxic conditions cause denitrification. The length of the phase is time dependent. Finally, sludge pump removes the excess of sludge to sludge draining unit.
3. Decantation
Decanter that is installed on rails secured to the wall of the tank, transfers treated sludge to the outlet.
4. Pause
The system is reset to the initial setting. At the same time pumping agitator recycles bottom sediment to the first chamber, and raw inflow of sewage creates conditions for biological phosphorus removal. The project provides installation of one agitator in each reactor. After pause, reactor begins a new cycle.
The technological solution provided by the reactor constitutes a complete set of devices and measuring equipment that is connected directly with control unit. The unit with control system enables the process and its separate phases with time and measurement function. It allows smooth adjustment of cycle length and its intensity as well as operation of individual devices depending on current composition of raw sewage (sewage load) and requirements towards the quality of treated sewage.
Advantages of CF SBR
The benefits of compact CF-SBR biological reactor
- CF-SBR biological reactor made of Duplex stainless steel is far more resilient to physiochemical properties of sewage and atmospheric conditions than concrete constructions, which has an effect on the reactors’ durability. Duplex steel construction is also more corrosion and mechanical damage resistant in comparison with other steel grades (mechanical properties of Duplex steel are at least 50% higher than in case of steel 304L/316L).
- modular construction – steel construction is light and yet very durable. The device is made of flat segments, which is useful in case of plant’s expansion as new panels may be easily added.
- significantly shorter period of construction and installation of the device regardless the time of the year and weather in comparison with traditional concrete reactors. Delivery and installation of the CF-SBR reactor lasts less that 3 months from placing the order.
If necessary, the tank may be disassembled and reassembled in a different place. Moreover, instead of end-of-life disposal, the steel structure may be scrapped and some of the investment costs may be recovered.
Efficiency:50 m3/d – 1800m3/d
