Aeration Tank Behavior in the Activated Sludge Wastewater Treatment Plant Startup Conditions Case study; (Wastewater Treatment plant of General Mosul hospital- Iraq)

Muthanna Journal of Engineering and Technology

Volume (1), Issue (1), Year (30 December 2011), Pages (01-13)


Research Article By:

Riyadh Mahmood Saleh Al-Obaidi

Corresponding author E-mail:


The biological unit in the wastewater treatment plants can be considered the most sensitive treatment units. It begins work with dynamic conditions for several weeks until reach the steady state conditions. Therefore, this study was done to observe aeration tank behavior (activated sludge unit) in the wastewater treatment plant of general hospital complex of Mosul city. Sampling made daily for more than 30 days. The biological treatment monitoring parameter was tested. The study shown that there is need to about 45-60 days to complete the start up work to be the operation stable and successful (if it worked without seeding). There was simple growth of microorganisms with modest treatment of organic matter, and then it rose after 3 first weeks of operation. There was contrary relationship between organic content and suspended solids in the aeration tank; an equation of this relation has been presented. The pH has risen in the first days in the effluent wastewater, then return to be less than influent pH with a relative relation with the activity of the microorganisms and surface aeration in the tank. The EC was simply reduced in the Effluent along with the study.

Keywords: Activated sludge, startup, operation, aeration tank.

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