Biotreater online measurement

[RickardFornell]

Hi everyone,
I´m a bit curious about if anyone knows if it is possible to measure nitrogen and phosphorous compounds (nitrate, phosphate and so on) online in a biotreater(ASU)?

 

[m777182]

You should give a basic information about concentration level you would like to monitor and a matrix of the system. Nitrate and phosphate (as ortophosphoric acid) one can measure very precisely and to a low level in DM water. With a slightly more complex matrix (other phosphates, other salts,...) it will take your time.
m777182

 

[RickardFornell]

What my question was aimed at was if it is at all possible to monitor the levels of C,N,P-compounds online in an ASU cycle in order to optimize the denitrification and nitrification. The system will include other substances such as salts and sulfides of course. The WWTP is connected to an oil refinery. Today we measure Phosphorus online but it would also be interesting to know the levels of for example nitrates, nitrites, NH4+ and total nitrogen..

According to your post it sounds like it´s not possible?

 

[m777182]

I did not mean it was impossible, but it would be quite a task. My experience with phosphates (di-, hexameta-, poly-, and phosphonates) are based on work in a heterogeneous (15%solids)solution that was saturated with NaCL, Na2CO3,Na2SO4 and oversaturated with a gas, nasty!
If you could accept a concept of sample and hold then it would be easier: you could employ a multitasking titrator for nitrate and phosphate (as ortophosphates)determination. With other phosphates a pretreatment of the sample is neccessary.In the same time you can measure pH and oxidation-reduction potential and conductivity. Sulphides can be done titrimetricaly as well. Carbon could be measured with organic/total carbon analyzer but this is another device. Contact vendors of multitasking titrators and insist to make at least 48 hours or better one week tests with your particular water.Carbon is another, quite expencive story.
m777182