Water and Wastewater.com Help Forums - Need help High COD/BOD ratio

Maryam Wastewater YaBB Newbies Offline I love Water and Wastewater.com Posts: 15 Gender: Company or Organization: Waterworks	Need help High COD/BOD ratio May 23^rd, 2012, 2:56pm Hi All, I need to design a treatment plant for industrial wastewater with following specification: COD:5000 mg/l BOD:700 mg/l Ammonia: 126 mg/l Oil and grease 40 mg/l SS: 14 mg/l I am wondering with having high COD/BOD ratio, is there any suitable biological system or I need to design a chemical process? Thank you Maya
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Jeff Naumann God Member Offline I love Water and Wastewater.com Posts: 1133 Torrance, California Gender: Company or Organization: Jeff Naumann & Associates	Re: Need help High COD/BOD ratio Reply #1 - May 23^rd, 2012, 5:51pm Could you define "industrial waste water?" In other words, what kind of waste water from what kind of industry? What are the requirements on the treated effluent?
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Maryam Wastewater YaBB Newbies Offline I love Water and Wastewater.com Posts: 15 Gender: Company or Organization: Waterworks	Re: Need help High COD/BOD ratio Reply #2 - May 23^rd, 2012, 8:18pm Thank you for your reply It is needle manufacture wastewater and the effluent should be COD:200 BOD:100 Oil and grease :10
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grrun

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Re: Need help High COD/BOD ratio
Reply #3 - May 23^rd, 2012, 10:51pm

I think that you'll have to determine the chemical composition of the components of the COD. You might also run BOD₁₀ and BOD₂₀ to check whether the COD is biologically treatable.

I think that you need to evaluate the manufacturing process to determine the wastewater contaminants produced. Look at the lapping compounds, heat treating processes, cleaning processes, etc. etc. You need to gather more information about the manufacturing process to even start to determine the chemical composition of the COD. While you are at it; look for opportunities for waste reduction in the manufacturing process. A good source of information is also purchasing records (especially "indirect material" purchases) because companies record purchases of raw materials, but do not record wastes going down the drain. If you're lucky, the materials used may even have their composition on the label.

grrun

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Tom Keenan - nesa

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Re: Need help High COD/BOD ratio
Reply #4 - May 24^th, 2012, 3:54am

The COD reduction required is 96%. IN "normal" circumstances this is a relatively high level of COD removal for a biological process. However, before you could decide what type of treatment you require, and whether biological treatment would be suitable or not, you really need to establish the make up of the wastewater. What are the main constituents that are registering as COD, and, as grrun says, check BOD5 and BOD20 to see how biodegradable these materials are.

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Maryam Wastewater YaBB Newbies Offline I love Water and Wastewater.com Posts: 15 Gender: Company or Organization: Waterworks	Re: Need help High COD/BOD ratio Reply #5 - May 24^th, 2012, 10:07am Hi The problem is I do not have any more information.So I was thinking to design a MLE system +Ozon to make sure that COD removal get to the maximum point. * BOD5:700
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Jeff Naumann God Member Offline I love Water and Wastewater.com Posts: 1133 Torrance, California Gender: Company or Organization: Jeff Naumann & Associates	Re: Need help High COD/BOD ratio Reply #6 - May 24^th, 2012, 12:38pm What is the daily flow volume, and variability of the flow? What is the pH of the waste? Why do you think that the treatment process that you have mentioned would be appropriate for this waste?
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Maryam Wastewater

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Re: Need help High COD/BOD ratio
Reply #7 - May 24^th, 2012, 1:30pm

The PH:8.8
and the flow is 20 m3/h

I was thinking if the MLE process can remove some part of COD (assuming if the deredable ratio is 3 so the COD will be 3*700=2100
so we can remove this much of COD based on biological treatment and the rest will be with Ozone)
Beside since the Ammonia is 130 something I need to have a Anoxic treatment.
pH is not a concern I think with having Equalization Tank.

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grrun God Member Offline WaterandWastewa ter.Com is the best! Posts: 3525 Pekin, IL Gender: Company or Organization: Freelance Environmental Engine	Re: Need help High COD/BOD ratio Reply #8 - May 24^th, 2012, 3:57pm With the information that you have; I doubt that you can design a competitive or economical process! grrun
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Tom Keenan - nesa God Member Offline Environmental Consultant - contact info@nesa.ie Posts: 2103 Gender: Company or Organization: nesa environmental consultants	Re: Need help High COD/BOD ratio Reply #9 - May 25^th, 2012, 3:12am You mention that because of ammonia you may need an anoxic zone? The anoxic zone will not treat ammonia, instead the ammonia is treated in the aerobic section and the anoxic section is used to remove Nitrate, (i.e. oxidised nitrogen).
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Maryam Wastewater YaBB Newbies Offline I love Water and Wastewater.com Posts: 15 Gender: Company or Organization: Waterworks	Re: Need help High COD/BOD ratio Reply #10 - May 25^th, 2012, 9:43am Thank you Tom and Grrun for your help Regards Maya
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Srinivas Devulapalli

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Re: Need help High COD/BOD ratio
Reply #11 - Jun 30^th, 2012, 5:46am

Before designing any Biological treatment plant we have estimate ulitmate BOD

BODt = BODu ( 1-10 –kt)

by taking the ultimate BOD value we can decide the waste water can fit for biological treatment or not

if it is ot fit for biological treament we have to adopt any AOP ( advanced oxidation process) electro oxidation, fenton, ozone etc.,

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