title: Achieving partial denitrification with sludge fermentation liquid as carbon source: the effect of seeding sludge.
abstract: The partial denitrification (nitrate to nitrite) has been a promising way for nitrate wastewater treatment combined with ANAMMOX system subsequently. This work investigated the effect of seeding sludge on partial denitrification by using sludge fermentation liquid as carbon source, with the sludge taken from: anoxic/oxic reactor (SA), anaerobic-anoxic-oxic reactor (SA-A-O) and alternately anaerobic sludge fermentation coupling anoxic denitrification reactor (SA-A). The results showed that transient accumulation of nitrite was observed in SA and SA-A-O. However, at the initial nitrate concentration of 30 mg/L, a high nitrite of 20.91 ± 0.52 mg/L was accumulated under complete nitrate reduction in the SA-A system, which indicated that partial denitrification could be realized. Furthermore, as much as 80% nitrate-to-nitrite transformation ratio (NTR) was achieved in a 108-day operation with inoculating SA-A, which illustrated the stability of partial denitrification under long-term operation.
authors.affiliation: Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China. Electronic address: caoshenbin@126.com.
authors.forename: Shenbin
authors.initials: S
authors.lastname: Cao
authors.forename: Shuying
authors.initials: S
authors.lastname: Wang
authors.forename: Yongzhen
authors.initials: Y
authors.lastname: Peng
authors.forename: Chengcheng
authors.initials: C
authors.lastname: Wu
authors.forename: Rui
authors.initials: R
authors.lastname: Du
authors.forename: Lingxiao
authors.initials: L
authors.lastname: Gong
authors.forename: Bin
authors.initials: B
authors.lastname: Ma
mesh_terms: D064751:Ammonium Compounds / Q000378:metabolism; D000693:Anaerobiosis / Q000187:drug effects; D002244:Carbon / Q000494:pharmacology*; D058440:Denitrification / Q000187:drug effects*; D005285:Fermentation / Q000187:drug effects*; D009566:Nitrates / Q000378:metabolism; D009573:Nitrites / Q000378:metabolism; D009584:Nitrogen / Q000302:isolation & purification; D010084:Oxidation-Reduction / Q000187:drug effects; D012722:Sewage / Q000737:chemistry*; D013997:Time Factors; D014865:Waste Disposal, Fluid; D062065:Wastewater / Q000737:chemistry; D018508:Water Purification
chemical_list: D064751:Ammonium Compounds; D002244:Carbon; D009566:Nitrates; D009573:Nitrites; D009584:Nitrogen; D012722:Sewage; D062065:Wastewater
keywords: ANAMMOX; Nitrite accumulation; Partial denitrification; Seeding sludge; Sludge fermentation liquid