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Project Topic:-
Membrane Bioreactor For Sewage
and Waste Water Treatment.
Made By:
DEEPTI KESHARI
B.Tech Sem VII (Chemical)
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AIM:- To assess the feasibility of Membrane Bioreactor
(MBR) in waste water and sewage water treatment.
To examine the research in the field of secondarytreatment of waste water using MBR technology.
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Membrane Processes
A membrane is a selective barrier that permits the
separation of certain species in a fluid by
combination of sieving and diffusion mechanisms
Membranes can separate particles and molecules
and over a wide particle size range and molecular
weights Membrane Processes are becoming popular
because they are considered Green technology -
no chemicals are used in the process.
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What is Membrane Bioreactor?
Membrane bioreactor (MBR) is the combination of a membrane
comprising of processes like microfiltration or ultrafiltration with a
suspended growth bioreactor used for wastewater treatment.
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Basics on MBR:-
Employ biological reactor and membrane filtration asa unified system for the secondary treatment ofwastewater.
Membranes perform the separation of the finaleffluent from the biomass through filtration.
Filtration takes place by the application of a pressure
gradient.
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Process Basics
membranewater
suction
dis. solids
sludge floc
viruses
bacteriakinet. energy
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Features:
Easy maintenance Flat membrane structure is simple and it is hard to adhere of contaminants. Inspection and management are easy.
Save space
The membrane separates solids and liquids, so sedimentation tank can beomitted.
Excess sludge is highly concentrated and can be directly dewatered. Low-cost
The system has a simple and compact structure. So the initial cost is low. High-quality treated water
Combining the MBR with RO membrane removes salt, and this water canbe re-used as industrial water, air conditioner cooling water, etc.
Highly reliable
The membrane elements are molded using advanced resin processingtechnology.
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Wastewater Treatment Process:
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1.Preliminary Preliminary treatment removes large objects from the
untreated wastewater (influent) as it enters thetreatment plant. The equipment includes screens for
removing debris and grit facilities for removing sand,gravel and other inorganic matter.
2.Primary
Primary treatment is the process where most of the
suspended solids settle out of the wastewater. Theconventional primary system consists of rectangularclarifier units equipped with collection systems on thetop and bottom. Most of the flows coming into the plantwil be treated here.
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Advanced secondary treatment - Membrane bio-reactor(MBR) technology
Secondary treatment is the process where soluble and finesuspended dissolved materials not already removed at primarytreatment are removed. As an alternative to conventionalsecondary processes (knows as conventional activated sludge),the Brightwater project uses Membrane Bioreactor (MBR)technology.
The MBR process includes: Fine screens which remove remaining debris and inorganic
material larger than 2 mm from the wastewater. Aeration basins that promote the growth of microorganisms
that consume organic matter, thereby creating wastewaterthat has less organic matter that can decompose.
Membrane tanks, which separate the liquids from the solids.
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MBR technology provides substantially better effluent quality than
conventional secondary treatment. MBR effluent is suitable for
irrigation of golf courses, playfields, and for industrial heating andcooling.
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Advantages of MBR technology are:-
Smaller footprint and smaller reactor volume. Decreased sludge production.
Higher and more consistent effluent quality as a resultof membrane filtration.
Lower sensitivity to contaminant peaks.
Relatively expensive to install and operate.
Frequent membrane monitoring and maintenance. Limitations imposed by pressure, temperature and pH
requirements to meet membrane tolerances.
Disadvantages:-
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THANK YOU
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