Sequencing Batch Reactor SBR
Cyclic activated-sludge biological treatment. A fill-and-draw activated-sludge process that performs equalisation, biological oxidation and clarification in one tank — compact, flexible biological polishing.
System Schematic
Representative process-flow — configured to your streamUnderlying Technology & Scientific Principle
The sequencing batch reactor is an activated-sludge process operated in timed cycles within a single basin: fill, react (aeration), settle, decant and idle. Performing aeration and clarification sequentially in one tank removes the need for separate clarifiers and provides built-in flow equalisation.
Working Mechanism
Wastewater fills the reactor over a mixed biomass; during the aerated react phase, micro-organisms oxidise organics and (with anoxic phases) nitrify/denitrify. Aeration stops for quiescent settling, clarified supernatant is decanted, and surplus sludge is wasted before the next cycle.
Separation / Removal Efficiency
Achieves >90–95% BOD/COD removal with effluent BOD <20 mg/L and TSS <30 mg/L, plus nitrogen removal when anoxic phases are programmed.
Operating Principle & Parameters
Cycle 4–8 h with phase times tuned to load; F/M ratio, MLSS and dissolved-oxygen setpoints govern performance. Inherent equalisation buffers variable flow.
Flow Rates & Volumetric Capacities
Twin/multi-basin SBRs from small packages to large municipal/industrial plants; basins alternate for continuous treatment.
Fluid Media Compatibility
Concrete/steel basins with fine-bubble aeration, decanters and mixers; biomass in suspension.
System Schematic & Process Integration
Secondary/tertiary biological stage after primary de-oiling and toxicity control; ahead of filtration/membrane polishing for reuse.
Options / Variations Available
Conventional SBR, ICEAS continuous-inflow, granular-sludge (aerobic granular) variants for nutrient removal.
System Complexity & Automation Level
High — fully programmed cycle, aeration, decant and wasting on timers and DO/level; complex control is its main demand.
Applications & Performance Delivered
Refinery & petrochemical ETP biology
Oxidises COD/BOD with built-in equalisation for variable load.
Nutrient (nitrogen) removal
Programmed anoxic phases nitrify and denitrify.
Compact / modular bio-treatment
Combines aeration and clarification where space is limited.
Contaminant Removal Profile
Continue exploring the train
PolishingChlorine Dioxide (ClO₂) Treatment
ClO₂A powerful selective oxidant and biocide dosed on-site — controls biofouling and oxidises sulphides without forming chlorinated by-products.
Explore technology →
PolishingAdvanced Oxidation Processes
AOPHydroxyl-radical generation (UV/ozone/peroxide/Fenton) that destroys the most persistent organics outright — mineralising what other processes only transfer.
Explore technology →
PolishingElectro-oxidation
EODirect anodic oxidation at dimensionally stable electrodes that destroys refractory organics and ammonia in high-salinity brines — chemical-free advanced oxidation.
Explore technology →