Project Topi

7/28/2019 Project Topi

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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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