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May 21st, 2013, 10:48am
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synthetic wastewater for MLE system (Read 474 times)
GJ
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synthetic wastewater for MLE system
Mar 03rd, 2013, 10:15pm
 
Hi, all.

I am from Singapore and now I am doing my master thesis. I am monitoring the occurrence of some chemicals in wastewater treatment plant containing primary and secondary treatments. To satisfy the request of our sponsor, we are required to construct a bench-scale MLE system. The data are to re-confirm or explain what we observed in monitoring data.

However, the requirements are not so strict. to save time, we only need to test a rational synthetic wastewater which may not need to be like the real one. I may know the standardized synthetic wastewater, but I think I need to increase the Nitrogen percentage since MLE is for N removal, right? How should I increase N concentration rationally?

Besides, may I know the biodegradability of synthetic wastewater? Should I prepare daily if I put my reactors in a ventilated space where the temperature is from 28-32 Celsius>


Thanks!
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BendelBoy
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Re: synthetic wastewater for MLE system
Reply #1 - Mar 5th, 2013, 8:37am
 
MLE is for N removal, but this does not mean that you need elevated N - the aim is to produce low total N.

As for storage, 4 Celsius or lower, ambient before you use it, and probably around a week's worth. As a synthetic sewage it will have fewer degradation issues than the real thing. You may even find you don't need to refrigerate it - do checks on the COD/NH3 as you go along.
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DrHenry
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Re: synthetic wastewater for MLE system
Reply #2 - Mar 6th, 2013, 5:30pm
 
You usually make up a week's worth of synthetic wastewater and adjust the species including COD/BOD to mimic the real wastewater.  So if the real has copper in it, you add copper to the recipe.  Notrogen requires you to know the form of the nitrogen.

I use the recipes found in OECD 302/304 methods.  I believe the recipe is actually in the footnotes of one of the methods.
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