Details

Autor(en) / Beteiligte

• Qian, Yunzhi
• Shen, Junhao
• Chen, Fuqiang
• Guo, Yan
• Qin, Yu
• Li, Yu-You

Titel

Increasing nitrogen and organic matter removal from swine manure digestate by including pre-denitrification and recirculation in single-stage partial nitritation/anammox

Ist Teil von

• Bioresource technology, 2023-01, Vol.367, p.128229-128229, Article 128229

Ort / Verlag

Elsevier Ltd

Erscheinungsjahr

2023

Quelle

Access via ScienceDirect (Elsevier)

Beschreibungen/Notizen

• [Display omitted] •A novel two-stage denitrification SNAP process for swine wastewater was evaluated.•The total nitrogen removal efficiency obtained was as high as 88%–96%.•The COD and BOD5 removal efficiencies were 81%–84% and 93%–97%, respectively.•Efficient NOx− removal by the denitrification unit ensured superior nitrogen removal. A novel two-stage process comprising pre-denitrification and single-stage partial nitritation/anammox was developed to treat swine manure digestate with a constant nitrogen loading rate of 1.0 gN/L/d. As the influent NH4+-N concentration increased from 500 to 1500 mg/L, a nitrogen removal efficiency of 88 %–96 % and 5-day biochemical oxygen demand removal efficiency of 93 %–97 % were achieved. Owing to the high influent chemical oxygen demand (COD)/nitrates and nitrites (NOX) ratio of 8.2–9.2 and high COD utilization of denitrifying bacteria (DB), the NO2−-N and NO3−-N removal efficiencies in the denitrification reactor reached 96 %–99 % and 97 %–99 %, respectively. The contribution of anammox bacteria to nitrogen removal was 70.9 %–84.3 %, whereas that of DB was 11.7 %–18.3 %. The contributions of DB and ordinary heterotrophic organisms to COD removal were 19.5 %–49.3 % and 17.9 %–39 %, respectively. This study will help guide the anammox process in swine wastewater treatment.