Lab sewage plant

The lab sewage plant is an activated sludge plant with upstream denitrification. It contains only the biological wastewater treatment steps. The feedwater is led into the denitrification basin and then passes through nitrification and secondary clarification before ending in the drain water container. Internal recirculation ensures that the nitrate built during nitrification is recycled back to the denitrification basin. Sludge recirculation recycles the active biomass from secondary clarification back to the denitrification basin.

Figure 1: Components of the lab sewage plant. A: Denitrification basin. B: Nitrification basin. C: Secondary clarifier. D: Feedwater container. E: Drain water container. F: Feedwater inlet. G: Internal recirculation. H: Sludge recirculation.