Abstract
Chironomid larvae (CL), aquatic invertebrates in freshwater environments are the common macro‐scale organisms in activated sludge wastewater treatment systems. The effects of CL on biomass quantity, sludge characteristics, and nitrogen removal efficiency were investigated in a domestic wastewater treatment system in this study. The batch tests showed that CL induced sludge reduction and enhanced sludge settlement. A maximum sludge weight reduction rate of 42% was achieved at the CL wet‐weight density of 0.5 g CL/g total suspend solid (TSS), and the sludge volume index (SVI) decreased from 146 to 78 mL/g as the CL wet‐weight density increased from 0 to 0.5 g CL/g TSS. After 52 operation cycles, the system with the CL density of 0.5 g CL/g TSS had a lower sludge yield (0.22 g volatile suspended solid (VSS)/g removed chemical oxygen demand (CODremoved) than the control reactor without CL addition (0.34 g VSS/g CODremoved). Addition of CL enhanced the simultaneous nitrification and denitrification (SND), but partially inhibited nitrification.
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