SBR biological sewage treatment plant

Project brief introduction 

This domestic sewage processing adopt hydrolysisSBR( Sequencing Batch Reactor Activated sludge process), it is : pretreatment adopt grilling intercept and sand setting processing, main body adopting hydrolysis and biochemical treatment SBR processing, set PAC dosing system as assisting dephosphorize, equip effluent CLO2 disinfection device. 

 Processing description: 

The sewage was removed bigger inorganic particle and floater, then flow into hydrolysis pond. in the anaerobic condition, adopt hydrolysis and acid yield microbial, make the Insoluble state organic in sewage interception and gradual conversion into dissolved state organic, make the macromolecule ,difficult biodegradable material in sewage transform into small molecular organic easy to biodegradation, improve the sewage biodegradability, reduce the subsequent aerobic biological treatment unit energy consumption, short retention time. Reduce the sludge discharge volume, cut down operational cost,then enter into SBR tank, fully mixed with the backflowing sludge from reaction area, finish a series of biochemical reaction. The denitrifying bacteria in sludge make the organic in sewage as carbon source, restore the nitric nitrogen as nitrogen, realize denitrification.

The Technics Processing is as follows: 

(Stating: SBR system) 

SBR system is composed of pre-react zone and main react zone. 

Organic matter further degradation stabilize ,nitration and dephosphorization all in main reaction zone. It is the key of SBR system, this tank set homogenize,primary settling,biodegradation and secondary settling etc function into together, no sludge return-flow system. 

SBR processing contain 5 stage:

a.water Inlet period, adding substrate 

b.Reaction period, substrate degradation 

c.sediment period, mud and water separation 

d.drainage period, discharge supernate 

e.Idle period, recover activity 

SBR operational cycle is confirmed by filling time,reaction time,settling time ,drain water and sludge and idle time. The water filling time should have a optimal value, it should be confirm according to specific water quality and aeration manner in processing, when adopt limited quantity aeration manner and high concentration pollutant in influent water, the filling time should be longer; otherwise, the filling time should be shorter by appropriate. The filling time is 1-4h usually. 

Reaction time (TR) is a very important technics design data in confirming SBR reaction volume, its value depend on sewage character,sludge concentration in reactor and aeration manner etc factor. About the domestic sewage, its reaction time can be short, to that sewage contain non-degradation matter or toxic substance, its reaction time should much longer. It need 2-8h,