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Tertiary treatment advice (Read 465 times)

Ana YaBB Newbies Offline Water and Wastewater.com is the best! Posts: 9	Tertiary treatment advice Mar 05^th, 2013, 4:45am Dear All, I'm upgrading an existing Municipal biological treatment plant where the required effluent target is BOD = 3.8 mg/l and TP = 0.11mg/l. Can you advice on a tertiary treatment that will achieve these low levels? The current treatment plant is achieving BOD = 20 mg/l and TP = 2 mg/l. I thank you in advance.
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BendelBoy

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Re: Tertiary treatment advice
Reply #1 - Mar 5^th, 2013, 8:41am

Consider filtration to remove BOD *if it is associated with particulate matter* You need to do a BOD test on the filtered effluent. If a lot of the BOD is soluble you will need to upgrade the biological treatment system.

For P you are going to need to look at chemical addition. Best place to dose that will depend upon your treatment system; best chemical depends upon local prices.

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Re: Tertiary treatment advice
Reply #2 - Mar 5^th, 2013, 7:14pm

Offhand, this requirement sounds suspiciously like reverse osmosis. BOD results in that range are relatively unreliable and the phosphorus results would probably require not only chemical additions, but solids separations and pH adjustments. Activated carbon might reduce the BOD concentration to your required limit but I would still bet on the RO.

My guess is that the municipality is planning to recycle the treated wastewater.

grrun

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