In order to create an effluent that is suitable for release to the surrounding environment, or an intended reuse application, sewage treatment, also known as domestic wastewater treatment or municipal wastewater treatment, removes toxins from sewage. This helps to prevent water pollution.
For this purpose, various technologies are utilized such as MBBR, MBR, SBR, etc. Let’s look at the difference between MBR and SBR technologies for treatment of sewage.
What are the Difference between MBR and SBR technologies?
What are Membrane bioreactors?
Membrane filtration is widely used in the treatment of water and wastewater, because it is more efficient and effective than conventional water technologies.
The four primary membrane processes are microfiltration (MF), ultrafiltration (UF), nanofiltration (NF), and reverse osmosis (RO).
Principal use of MBR
The principal use of membrane bioreactor (MBR) operations is wastewater treatment (WWT). This is done by combining microfiltration (MF) or ultrafiltration (UF) with a biological process, such as a suspended growth bioreactor.
A clear and pathogen-free product is produced by using the membranes as a filter, to remove the particulates produced during the biological process.
CAS vs. MBR
In the traditional activated sludge (CAS) system, the settlement tank for solid/liquid separation is largely replaced by a membrane bioreactor. The MBR offers the end user enhanced process control and significantly higher-quality product water.
When compared to the traditional activated sludge process, the MBR method operates over a significantly wider range of parameters.
Characteristics of MBR technology and conventional activated sludge systems
· SRT 20-30 days for an MBR and 5-20 days for a traditional system
· F/M 0.05 to 1.5 days for traditional systems and less than 0.1 days for MBR
· MLSS 5,000–20,000 mg/L for MBR and 2,000–4000 mg/L for conventional method
MBRs typically have three different membrane designs
Hollow fibre (HF)
Multi-tube (MT), and
Flat sheet (FS)
What are sequencing batch reactors (SBR)?
SBRs are the industrial wastewater treatment tanks. SBR reactors batch-treat wastewater from sewage treatment plants, anaerobic digestion plants, and mechanical biological treatment facilities.
Working of SBRs
In order to make the wastewater appropriate for disposal into sewers or for use on land, oxygen is bubbled through it to minimize the biochemical oxygen demand (BOD), and chemical oxygen demand (COD). Although, SBRs come in a variety of forms, the fundamental procedure is the same. The system comprises of a minimum of two similarly furnished tanks, connected by a switchable common inlet.
Firstly, raw sewage (influent) enters the tanks through one end, and cleaned water (effluent) exits the other end, forming a "flow through" system.
Secondly, the other tank is aerating and filling while the first is in the settle/decant mode.
Thirdly, the bio-reactor, a portion of the tank, is located at the inlet. This is made up of a number of walls or baffles that either direct the flow under and over one baffle after another, or from side to side of the tank. This aids in blending the returning activated sludge with the incoming influent, starting the biological digestion process before the liquor enters the tank's main chamber.
Process Configuration for SBR
The following are the main elements of SBRs:
· the reactor basin
· a device for waste sludge
· draw-off
· equipment for aeration
· decanter for effluent
System for process control in SBRs
For SBRs, numerous different effluent removal techniques have been created:
1: Fixed decanters with air-locked multiple pipe layouts and submerged outlet pipes, with automatic syphon control valves.
2: Moving equipment such as weir troughs, floating weirs, flexible coupling-connected pipes, tilting weirs, and floating submersible pumps.
3: Some decanters experience solids loss because mixed liquid suspended solids are trapped, in the submerged pipework or during the aeration process.
4: The effluent must be drained from the tank evenly, which is the main goal of the decanter design.
5: Point discharges experience scouring of suspended particles from the settled sludge blanket, and lack process flexibility, such as a higher sludge blanket through a higher tank solids concentration.
What benefits do SBRs offer?
1: Sequencing batch reactors' key benefit is that they generate effluent that is low in organic compounds, and may be used to satisfy stringent effluent regulations.
2: When the removal of the nutrients nitrogen and phosphorus is necessary, the system can be employed efficiently as a component of a larger system.
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According to the needs of the industry, we provide RO Plants, water softener, STPs, ETPs, with advanced technologies, such as MBR and SBR.
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