Figure 3: Average MLSS values in January, 2022 in the six basins of the SBR
From the figure, it can be seen that there is a sequential increase in the MLSS values in the six basins except for a slight fall in basin 3. Again after that, the MLSS values have continuously increased and basin 6 has the highest MLSS value which is the normal case for an SBR. As the wastewater purification proceeds in a stepwise manner, the water content is sequentially removed, increasing amounts of solids accumulate and hence the first basin shows minimum MLSS concentration while the last shows the maximum value. The standard deviation values also are within limits which shows that the performance of the plant over the month was highly stable and efficient.