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Wednesday, January 07, 2009

Developing MLSS during Startup; How?

Developing MLSS during Startup; How?
We are commissioning 200 m3/hr capacity wastewater treatment plant. Type of industry: Pulp and paper mode of treatment: Primary clarifier, Aeration tank; secondary clarifier.  Please let us know how to develop MLSS in aeration tank during start-up of the plant.

Satyanarayna
satyanarayna.cheerla@gmail.com

Showing: 1-5 of 5  
Responses

06 Jan, 2009   |  Nazimuddin

Dear Satyanarayna,

Fill the aeration tank with 50% primary treated wastewater + 50 % water and add some bacterial seed material (say 500 litre mixed liquor from an operating ASP plant or 100 kg cattle dung) aerate for 12 hours (as a batch reactor) to acclimatize and develop more biomass. Allow to settle for an hour and replace 50% supernatant with primary treated wastewater. Aerate for 6 more hours (as a batch reactor) to develop more biomass.

Now put the aeration tank to operation in continuous mode by feeding continuously with primary treated wastewater with sludge re-circulation as per design re-circulation rate but without any sludge wasting till the biomass concentration reaches to design MLSS. During this phase collect and analyze MLSS samples at every 12 hour interval.

Once the design MLSS concentration is achieved start sludge wasting as per design solids retention time (SRT). For example for a design SRT of 10 days one-tenth of the biomass is to be wasted per day and for a design SRT of 5 days one-fifth of the biomass is to be wasted per day. Volume of sludge wasting is calculated based on concentration of biomass in the sludge wasted considering whether sludge is wasted directly from aeration tank of from re-circulation line.

However, the total sludge wasting should be spread / split throughout a day, but at least in three parts if done in batches.
It is also worth noting that in a plant to treat industrial wastewater such as of paper mill it is very important that primary sedimentation should work very efficiently all the time else the share of inert solids in the aeration tank would be substantial and will reflect as part of MLSS/MLVSS, although not being active biomass.

Views are expressed in personal capacity.

Nazimuddin
Environmental Engineer
Pollution Control Implementation Division - III
Central Pollution Control Board
New Delhi


http://www.indiawaterportal.org/Network/askq/kb/?View=entry&EntryID=483

6 comments:

cola said...

sir,
Its very usfull ..
Renil
Kerala

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