Raw water source?

[Envengineer]

Hi

Does anyone have any experience or examples about using municipal wastewater efluent as a raw water source for "ultrapure" water?

Jani Vuorinen
E.On Finland

 

[bimr]

This is a subject that is talked about, but due to the expensive treatment required, is not often feasible. What do you want to know?

 

[Envengineer]

Thanks for your reply..

I'm looking for any literature, process examples,

http://www-sites,

what ever... that handles the issua. All I have now is an article from Desalination 1995 "RO-treatment of municipal sewage effluent for industrial reuse"

We are currently making our "make-up" water for steam boiler with RO (chlorination, coagulation, media filtration) + DM, using brackish water as raw water. But because our current raw water quality varies a lot other alternatives have come more interesting. And we do have municipal wastewater treatment plant right next to the power station..

 

[bimr]

You might try Purac over in Sweden or England. They used to have the experience to do this. I worked with them a long time ago in the US.

Most municipal wastewater is going to have ammonia, phosphorus, nitrogen, BOD, COD, and TOC. The level of treatment that you will be required to do depends on the extent of the existing treatment at the municipal plant.

If the municipal plant is not doing extensive treatment of the wastewater (called "advanced treatment&quot, then you will have to put a biological process in to remove the ammonia, phosphorus, nitrogen, and BOD/DOC. The effluent from the biological treatment is commonly lime softened in order to further remove contaminants. You will also have to chlorinate and then filter the effluent to remove the suspended solids. Hopefully the TOC will be low so you do not have to try to remove it. You will also have have to have some type of solids dewatering process for the solids generated in the treatment process.

Once you have done all of the above, the water will be suitable for treatment in your existing system. Treatment of municipal wastewater for reuse is a lot more complicated than what you are doing right now.

I have some experience in the power industry so if you need further assistance, let me know.