Combining simultaneous nitrification-endogenous denitrification and phosphorus removal with post-denitrification for low carbonitrogen wastewater treatment

摘要

Due to the limited nutrient removal from low carbonitrogen (<= 4) wastewater, a process combined simultaneous nitrification-endogenous denitrification and phosphorus removal (SNDPR) with post-denitrification (PD) in a SBR was proposed for deep-level nutrient removal without external carbon addition. SNDPR driven by PAOs and GAOs reduced PO43 -P (98.3%) and partial TN (59.0%) at low DO conditions (0.5 +/- 0.1 mg/L), and post-dentrification achieved further NOX (produced by SNDPR) removal (24.0%) anoxically by utilizing the residual intracellular polymers in GAOs. Combined control of anaerobic/aerobic/anoxic durations and low DO inhibition to aerobic GAOs and NOB conducted partial nitrification-endogenous denitrification (PNED) (66%), which saved 44.3% intracellular polymers to further reduce 64% TN in effluent. After 115-day operation, the average effluent PO43 -P and TN concentrations were 0.4 and 3.9 mg/L, respectively, with 92.1% of TN removal. Highly enriched PAOs (36% +/- 2%), GAOs (22% +/- 2%) and AOB (15% +/- 3%) over NOB (3% +/- 1%) facilitated P uptake, PNED and post-denitrification in the SNDPR-PD system. (C) 2016 Published by Elsevier Ltd.