Design of Oil and Grease Trap and MBBR Tank

Question

I have to install 500 KLD of STP plant for one of our clients in India.
The inlet parameters of this plant are.
BOD=350 mg/l COD=700 mg/l TSS= 850 mg/l
Rest of the parameters can be assumed.
The question is - what capacity of oil and grease trap and MBBR (aeration) tank we would have to construct for this plant?
Best regards
MOHD ARSHAD

Rajendrakumar Saraf · Answer

The values of BOD are two high for Indian sewage. It is between 150 to 200 mg/l.
Indian sewage does not have much oil & grease. It never goes above 10 mg/l.  For MBBR you may to add settling tank to remove suspended solids.
Rajendrakumar V Saraf, FIE, FIWWA
Chairman
 Viraj Envirozing India Pvt. Ltd
21, Radhakrishna, Near SBI, Paud Road
Pune 41038
Tel 02015433445, 9822186763
www.virajenvirozing.com

Orlando D. Gutiérrez Coronado · Answer

Dear Mohd,
You must use enough time to separe the oil and It will depend on what kind of oil you have in that effluent.
Even this calculations could depend on many factors as:
1) Equalization tank use.
2) Pretreatment.
3) Temperature.
4) Flow performance.
5) Daily flow pattern.
6) Oil emulsification.
7) Disponible area.
8) Removal target (BOD5, nitrification, nitrogen removal, others).
9) MBBR carrier surface area and other characteristics.
10) Future expansion.
11) Oxygen transfer rate.
12) Biodegradation of the organics.
13) Others.
Now about the MBBR, yuor need know many other factors as BODu, kg O2/h that your system can dissolve, and some others.
Thinking in the optimum conditions including having a good equalization system and constant flow to the treatment system, some authors could recommend for your system:
1) Grease tank volume: 5 to 10 m3 to be on the safe zone.
2) MBBR volume: 60 to 200 to be on the safe zone.
This is not mandatory, but it will depend on the evaluation of all the mentioned factors and some others.
Regards,
Orlando D. Gutiérrez Coronado

Nicolas Meudal · Answer

Hi Mohd,
You have a lot of TSS compare to a standard wastewater. What is the industry that produces this water?
Nicolas

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