SBR — Sequential Batch Reactor
The biological stage of the wastewater treatment plant is designed as a "sequenced batch reactor" (SBR) and represents one of the most modern treatment concepts being used for sewage treatment plants. The central characteristic of the biological stage is that the process takes place in one or more SBR-reactors, depending on the chosen plant design.
Each SBR-reactor operates according to the activated sludge process, but with a modified operation-concept, which uses the reactor as an aeration tank as well as a clarification system. Due to the SBR process, an extensive removal of dissolved organic substances from the wastewater can be achieved by nitrification and denitrification as well as by the removal of phosphorus.
Technology Overview
The purification of wastewater by SBR process has compared to traditional continuous flow process, a number of economic and technical advantages including rugged cleaning performance, minimized footprint, and high operation safety.
Working Principle
1. Fill-up phase
A cycle starts with the filling via the feeding pump. The wastewater free of rejects is fed from the buffer tank into the SBR-tank. The filling occurs in batches, till the maximum filling level is reached.
2. Mixing phase
Along with the feeding, denitrification is initiated while the "new" wastewater is mixed with the available activated sludge volume. This is the Anoxic phase with the optimal ratio between carbon and nitrogen.
3. Biological treatment phase
The plant changes to Aeration and Mixing mode. Required oxygen for reduction of carbon and nitrification is entered through aeration, which also ensures optimal mixing of wastewaters.
4. Settling phase
The activated sludge is sedimented over 1.0 to 1.5 hours. A perfect separation of the activated sludge and the cleared water is obtained in the treatment basin.
5. Discharging phase
The clear water zone is evacuated. A defined part of the excess sludge is pumped out into the provided sludge storage tank, and the cycle is ready to start again.
Technical Specification
| Flow | 10 to 5000 M3/day and more |
| Technology | Sequenced Batch Reactor |
| Hydraulic retention time | 14-16 hrs in SBR tank |
| Organic load range | 1 — 20 kg BOD/(m3*d) |
| Settling process | Batch Settling |
| Sludge recirculation rate | 0 — 15 % |
| Tank MOC | Concrete/MSEP |
| Polishing Treatment | Sand & Carbon Filters (Optional) |
| Controls | Electrical / Microprocessor / PLC |
Salient Features
- All tank in civil with flexible positioning
- Proven design with high operation stability
- Systems available from 10 — 5000 kl/day and more
- Fully / semi-automatic controls
- Technically mature and widely used method
Benefits
- Concrete tank design enhances longevity
- Expandable and flexible designs
- Completely above ground installation option
- High removal efficiency for nitrogen, BOD & COD
- Treated water reuse for irrigation and grey water applications
- Minimum maintenance requirements
- Rugged cleaning performance even with fluctuating loads
Application
- Housing Projects & Small Communities
- Schools, Hostels & Rural Area Schools
- Industrial Offices & Parks
- Recreational camps & travel trailer parks
- Shopping Centres & Restaurants
- Resorts, Golf Courses and country clubs
- Hospitals
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