"investigation of sahebgharanieh wastewater treatment plan operation in tehran and appropriate method’s for it’s upgrading"

this research, in addition to survey the existing data on the quality of sahebgharanieh wastewater treatment plant's effluent in the previous years, by runing a three months monitoring stage, studies the conditions of the final settling and aeration basin and the variations of the influent and effluent quantity and quality in removing of major pollutants (bod, cod, tss), while scrutinizing the primary criteria for designing this wwtp, so that by this means; the difficulties and defects that plant is faced with will be recognized, and finally by finding the roots of these problems; appropriate methods shall be presented for upgrading and optimizing wastewater plant's operations. the outcomes of this research show that this wwtp faces enhanced hydraulic lodas, which especially at peak currents; disturbs the sludge blanket and leads to the carry-over of biological solids in to the effluent. in addition the plant lacks of wastewater disinfection facilities and numerous operational problems such as additional sludge recycling to the system, shortage of dissolved oxygen and mixing in the aeration basins. discharging of solid loads resulting from constructional operations and the fuel leftovers in the network, is one of the other difficulties that the wastewater plant has.