It consisted of an aeration tank
of 300 L capacity and a settling portion of 200 L capacity.
A stable system of matured good activated sludge in a normally operating aeration tank
is characterized by predominance of sedentary ciliates with mandatory presence of free-floating forms.
This allows a continuous wastewater feed of about 5 GPM into the 10,000-gallon aeration tank
where the aerobic biological treatment occurs (oxidation of biochemical oxygen demand).
In the design of south Tehran sewerage treatment plant efforts have been made to design nitrifying trickling filter to the extent that oxygen transfer through the media be maximum Qiao, et al, , to control formation of biofilm patchiness by complete carbon removal through aeration tank
, to provide ammonia to even out diurnal ammonia loads by returning supernatant from sludge storage Chang, at al, [4,6,7], and controlling the levels of nuisance organisms by the following processes:
Concentration of N[H.sub.4]-N before trickling filter and after aeration tank
has shown that nitrification was well done.
The wastewater is domestic sewage pumped from the septic tanks, to an aeration tank
, and then through two parallel SSFCW cells.
The treated water then goes through multiple filtration layers and an aeration tank
before it is used for flushing and horticulture purposes." The plant also comprises of advanced treatment systems such as ultra- filtration and reverse osmosis to process the waste water.
Secondary treatment system consists of a two stage aerobic biological process is employed in the aeration tank
for the degradation of the organic pollutant load based on the activated sludge process.
The consultant reviewed, evaluated, and defined the technical approach that provided an aluminum cover system and related components for the existing aeration tanks
, aeration tank
effluent channels, and final sedimentation tank effluent channels.
The systems are used in the aeration tank
to keep solids suspended.
The experimental parameters investigated in this study consist of 3 types of food waste strength, 3 levels of aeration tank
biomass concentration, 3 levels of phenol concentration, and 4 aeration periods.
SECONDARY AERATION TANK
Wastewater mixes with air and microorganisms.