Tenders are invited for the project consists of constructing rehabilitation improvements to the mixed liquor suspended solids
pump station located at the city~s wastewater reclamation facility.
Figure 10 shows the evolution of the transmembrane pressure (TMP) and the mixed liquor suspended solids
during reactor operation.
The Turbi-Tech LA has an operating range suitable for use in aeration systems and may be used to monitor mixed liquor suspended solids
(MLSS) and returned activated sludge (RAS).
The required Mixed liquor suspended solids
are maintained by the recirculation of sludge settle in the clarifier.
"Free" oxygen is supplied to the mixed liquor suspended solids
by the blowers to sustain nitrification.
The biological process is designed to accumulate solids until a mixed liquor suspended solids
(MLSS) level of approximately 12,000 mg/L is reached.
The oxidation ditch currently is operated at a mixed liquor suspended solids
(MLSS) concentration of 4500 mg/L with a sludge age of 40 days.
Because activated sludge stays in the bioreactor, the concentration of mixed liquor suspended solids
(MLSS) is much higher than it would be in a conventional activated sludge process (10,000 to 12,000 mg/L).
Other parameters include BOD, required effluent quality, nitrogenous oxygen demand, mixed liquor suspended solids
(MLSS), peak and design flows, organic loadings (ratio of BOD to reactor volume), and the design food-to-microorganism (F:M) ratio, to determine appropriate factors for the conversion of the actual oxygen requirements.
Criteria for sizing aeration units are in terms of pounds of BOD in the tank influent per day per 1,000 cu ft of tank volume, ranging from 25 to 100; or pounds of BOD per 100 lb of volatile solids under aeration (or "mixed liquor suspended solids
"), ranging from 10 to 100 or optimally 25 to 50 lb.