A continuous-flow combined process based on partial nitrification-Anammox and partial denitrification-Anammox (PN/A + PD/A) for enhanced nitrogen removal from mature landfill leachate. (February 2020)

• Record Type: Journal Article
• Authors: Wang, Zhong; Zhang, Liang; Zhang, Fangzhai; Jiang, Hao; Ren, Shang; Wang, Wei; Peng, Yongzhen
• Is Part Of: Bioresource technology. Volume 297(2020)
• Publication Date: 2020-02
• Subjects: Landfill leachate -- Partial nitrification -- Anammox -- Partial denitrification -- Enhanced nitrogen removal; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2019.122483
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphic abstract: Highlights: A continuous-flow process based on PN/A and PD/A was developed to treat leachate. NH4 + -N conversion rate of 93.4% and NAR of 91.5% were realized in A/O reactor. The remaining DOM in effluent was mainly fulvic-like substances. The nitrate-to-nitrite transform ratio (NTR) reached to 60.4% in PD/A reactor. The effluent TN of 15.7 mg/L and TN removal efficiency of 98.8% were achieved. Abstract: A novel continuous-flow combined process of partial nitrification, Anammox (PN/A) and partial denitrification-Anammox (PD/A) was established to achieve enhanced nitrogen removal from landfill leachate. The NH4 + -N transformation rate and NO2 − -N accumulation rate in the PN reactor reached 93.4% and 91.5%, respectively. The nitrite generated from the PN reactor was combined with influent (38%) and fed into the Anammox reactor. The nitrate produced in the Anammox reactor was then discharged to PD/A reactor, where nitrate was transformed to nitrite and removed via Anammox. Under a COD/NO3 − -N ratio of 4.0, the NO3 − -N-to-NO2 − -N transformation ratio (NTR) and Anammox contribution rate reached 60.4% and 57.1% in PD/A reactor. The final effluent TN concentration was 15.7 mg/L, and the efficiency of TN removal could reach 98.8%. By combining PN/A with PD/A, enhanced nitrogen removal from landfill leachate was achieved successfully with an external carbon source addition (COD/NH4 + -N) of 0.28.