What is the simple method to estimate T90 for the sewage river, dumping effluent to sea through estuary?

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Jordie J. C. Netten

You can use all kinds of dyes as a tracer.

Rhodamines types of dye can be used. These dyes are absorbed to the suspended matter with set decay rates. More info e.g. in the URL attached. Newer literature must be available too.

http://books.google.nl/books?id=wLobBQAAQBAJ&pg=PA421&lpg=PA421&dq=t90+effluent&source=bl&ots=50t8mQ7_V-&sig=4y35liEUsT4_D1-VqUjwxBXSuv8&hl=nl&sa=X&ei=hhx_VP-ENMW4OOr8gaAG&ved=0CD8Q6AEwBA#v=onepage&q=t90%20effluent&f=false

Gunda Mohanakrishna

You can refer to the following paper for the T90 method.

http://ftp.sccwrp.org/pub/download/DOCUMENTS/AnnualReports/2001_02AnnualReport/16_ar39-rachel.pdf

Tariq Masood Ali Khan

Thank you so much for your response. Is there any manual or guidelines for sampling Methods and analysis.