Eco Process, SBR... the client's best choice, SBR vs CAS comparison

Parameters Compared	CAS Conventional Activated Sludge	SBR Sequencing Batch Reactor
Basic Biological Principle	Biological treatment process based on the growth of microorganisms forming an active biomass which is maintained in suspension as part of the mixed liquor of a reactor	Same
Specific Process Principle	Continuous flow of wastewater throughout the biological treatment plant regardless of flow or organic variations	Responsible batch treatment considering the organic and hydraulic variations
Main Process Strength	Process is "hydraulically driven" and designed with certain flexibilities to overcome the loads variations. Apparent simplicity of operation with very limited biological process control	Process is "time driven" as each batch of wastewater is scientifically treated using numerous biological process controls
General Process Layout Approach	CAS uses a "series of basins with mechanical scrapers and sludge recirculation system CAS is a "space-oriented" process with more structures and mechanical elements	SBR is a "one-reactor" technology in which all necessary treatment steps occur (physical and biological) SBR in a "time-oriented" process in which a combined reactor/clarifier is used
Main Biological Controls	Very limited generally Sludge age (SRT) Sludge recirculation (from the clarifier to the reactor)	Nature of the organics using prefermentation Feed mode of the organic and hydraulic loads to the reactor Environment life status of the process operation flexibility reactor (anoxic, anaerobic, aerobic) Time control of each biological reaction and physical step of a sequence Biomass activities and settleability characteristics Priority of biological reactions to enhance the performances
Biological Selective Effect for SS Control	Non-existent with complete-mix CAS Requires an additional reactor ahead of the reactor or a special plug-flow configuration of the reactor construction	Very powerful biological selective effect using ECO-RFB SBR technology Partial selective effect is available with ECO gradual-fill SBR technology
Risk of Bulking Sludge	Always present	No risk
Operating Strategy	Treatment flexibility is provided by using 50% of the bacteria capacity. Operator is a key man and must follow the operation and try to manually intervene in the process with very weak means at his disposal. For example, sludge age and sludge recirculation.	Treatment capacity and control of the process can be optimized by modifying the organic conditions and the feed mode of the reactor. The key operator is the PLC (Programmable Logic Controller) which is responsible for all process decisions at all times.
Overall Performance	Reasonably good for municipal wastewaters provided all flexibilities are built into the design initially Limited for industrial wastewaters	Excellent for municipal wastewater particularly if the RFB-technique is used along with the nutrient removal technology Ideal for all industrial wastewater
Nutrient Removal Capacity to 0.5 mg P_T/L	Possible by adding chemicals and filtration	Bio-P-Sequencer technology available using 2 SBRs in series No chemicals required No tertiary filtration required
Necessity of Equalization	Recommended in many instances	Not necessary. Self-equalized capacity with "gradual-fill and draw" SBR Recommended for advanced nutrient removal systems as an integrated part of a fermentor
Major Process Equipment	Aeration and mixing equipment Sludge return piping and pumps (variable flow controls) Sludge wasting pump	Aeration and mixing equipment Sludge wasting pump
Space Requirement	Important space required	A 30% - 40% space savings can be realized compared to a conventional activated sludge systems
Major Process Structures Necessary for the Best Possible Treatment Performance	Secondary Treatment Pre-selector reactor Aeration basin (reactor) Clarifier Sludge recycling system Tertiary Treatment Denitrification reactor Chemical addition Filtration	Secondary Treatment SBR reactor only Tertiary Treatment Equalization/ prefermentation /UL>
Savings of the Operator's Time	Very limited	Important savings can be realized by using our BioLog SC-2000 PLC controls for daily operation, weekly reports, maintenance and even for remote operation and surveillance
Energy Savings	Very limited	Many savings are possible using: D.O. probe and controller Redox probe and controller RFB feed mode Prefermentation Up to 50% of the energy can be saved for advanced treatment technology
Capital Cost Savings (complete plant)	Very limited	20% - 30% savings compared to conventional activated sludge systems

Profile	Wastewater treament	Equipment	References	Consulting	Business Co-operation	Feedback
SBR vs CAS
SBR , Sequencing Batch Reactor	Trickling Filter	Aerated Lagoon	Wastewater treatment applications	Represented Equipment
Our technical objectives	Our SBR preferred process	Our SBR family development	Nutrient Removal	Our design approach
Our SBR equipment	Our process control	SBR, the client's best choice	Our clients testimonies	Partial list of SBR installations	SBR, a technology in evolution
		Process Features	Process comparison	Cost
Flow Diagram	Process Advantages	SBR vs CAS	SBR vs RBC	US EPA Evaluation