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TSO - SBR (Sequencing Batch Reactor).

From 10 to 10.000 equivalent inhabitants. 
This particular method is the most modern and advanced waste water treatment one. It's completely controlled and advantageous over other systems thanks to the low electricity consumption and the reduced maintenance costs.  
Because the waste water coming from municipalities, communities, districts, hotels etc are characterized by large fluctuations of the daily and hourly supplies, the waste water treatment plant (wwtp) that will be constructed must have the capacity to adjust its processes to the increases/decreases of incoming waste water and pollutant supply, their temperature, thus maximizing its degree of efficiency and saving energy.  
Taking into account all of the above leads to the conclusion that the most appropriate and suitable treatement system is the wwtp with SB Reactors, which besides the oxidization of  the organic compounds, it can also perform the oxidization of the ammonium nitrogen, the denitrification and the biological and chemical dephosphorisation and the stabilization of the sludge depending on our requirements. The TSO-SBR plants can be extended by adding  extra reactors and by adjusting the operation schedule to new data.  

 Plant Structure.

plant consists of :
1.    Pre-treatment system - Grading, hand or automatically operated, cleanable 
2.    Sand-collector - Grease-collector (if required)  
3.    Equalization pump - Entry pump-station 
4.    Biological SB Reactor (one, two or more) for the waste water treatment 
5.    Desinfection system
6.    Clean water tank (optional)
7.    Excess sludge thickening tank 
8.    Sludge dewatering system (optional)
9.    Refining treated waste water system (optional)
10.   Removal of phosphorus by chemical addition system (optional)

plants in question are designed for a BOD5 reduction of 95-99%, COD reduction up to 95% and reduction of suspended solids of 95,5-99,5%, so that the pollutants' concentrations at the exit of the  plant  will be smaller than those allowed by law.

Description of the Plant Operation.

The waste water is led into the equalization tank which is equipped with two or three underwater waste water pumps, which pump the waste water in turn into the reactor. The reactor is equipped with aeration, mixing and removal systems and operates periodically, automatically.   
Each operation consists of the following phases:
•    Ι Completion,
•    ΙΙ Mixing,
•    ΙΙΙ Aeration,
•    ΙV Μixing,
•    V Αeration,
•    VI Sedimentation and cleaning,
•    VII Evacuation,
•    VIII Stabilization, excess sludge removal 

After the filling of the reactor input supply stops, and all the phases are run up to the evacuation and removal of excess sludge. Then, it will pass again at the input supply phase and the cycle is repeated. The duration of each phase of the cycle are regulated depending on the quantity of waste water so that the expected result will be achieved with the most economical operation. The system is flexible in fluctuations and can work with overloading for several days without significant increase of pollutants in the output. Aeration and mixing machines are activated automatically according to the schedule of the plant  and the conditions prevailing in the reactor.

Release of treated waste-water - Output limits

The treated waste water could be released to any drainage or be used for underground irrigation. The pollutant values of the treated waste water are equal or less that the ones allowed by E.U. and U.S. specifications.  


The TSO-SBR  plants are equipped with an automation system based on a computer control unit PLC by SIEMENS and an operational program designed especially for them. According to the input data concerning the quantity and quality of the waste water, the system automatically adjusts the  plant operation by regulating the time and sequence followed by the pumps, ventilators, mixers and electric valves. It controls if they are in the right position and alerts in case of any abnormalities and adjusts its operation.  
In case of excessive overload in supply, the system automatically adjusts and operates according to an emergency conditions' schedule.  
The SBR plant is fully automated. The automation system minimizes the human error possibility on one hand, and on the other hand reduces the 
plant maintenance to some simple periodic visits. The above mentioned operation indications can be controlled on a local level and can be transmitted to a central control system, where there will be a constant surveillance and interference on the operation of the unit. Small plants- up to 500 inhabitants- are equipped with a simplified automation system.  


The line TSO-SBR-/-P of capacity up to 600 EI consists of one or more reactors from polyethylene put in two parallel series, with a visit corridor between them. The plant (except the pump station) is placed on the ground or inside a specially-crafted industrial building. The line of TSO-SBR-/-C of capacity over 50 equivalent inhabitants consists of one or two parallel reactors constructed from reinforced concrete with a visit corridor. It can be built underground or semi-underground.


The main advantage of SBR plants compared to the conventional units of active sludge, besides of course their effectiveness, is to adapt its operation to the supply fluctuations, and therefore lead to power savings up to 50%. 

1. Stable performance.
2.The plant shall ensure stable performance in the final treated output.
3. Excellent quality of processed waste. The quality of the treated waste is within the limits specified by law in order to allow their release to any drainaget.
4. Economic function. The use of very efficient aeration systems AEROSTRIP of the Austrian AQUACONSULT House, the adjustment of processes of aeration and mixing to fluctuations, and reusability of treated waste water, make it a very economic system. 
5. Complete elimination of odours.
6. Fully automated operation
7. Minimum maintenance and requires qualified staff.
8. Easy to change conditions for reactors in aerobic and anaerobic, anoxikes
9. Great elasticity and slack in the system, i.e. capacity to accommodate from 30-150% of the daily supply with a high degree of cleaning
10. Possibility of chemical phosphorus removal in case of increased requirements
11. Easy working reactor cycle change depending on the required quality of treated wastewater.
12. Small installation time
13. Simple release of treated waste.
14. Does not require separate settling tanks and recirculating pumps.
15. Minimum space required.

Vouliagmenis Av. 360, Ag. Dimitrios, Athens t.210-994-0389 f.210-995-1035 e-mail: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it www.ipc-tso.gr, www.compass-pools.net
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