Performance of anammox process treating nitrogen-rich saline wastewater: Kinetics and nitrite inhibition. (20th October 2018)

• Record Type: Journal Article
• Authors: Qi, Panqing; Li, Jin; Dong, Huiyu; Wang, Dan; Bo, Yuntai
• Is Part Of: Journal of cleaner production. Volume 199(2018)
• Page Start: 493
• Page End: 502
• Publication Date: 2018-10-20
• Subjects: Nitrogen-rich saline wastewater -- Anammox -- Sponge Carrier -- Recovery performance -- Kinetics -- Nitrite inhibition; Factory and trade waste -- Management -- Periodicals; Manufactures -- Environmental aspects -- Periodicals; Déchets industriels -- Gestion -- Périodiques; Usines -- Aspect de l'environnement -- Périodiques; 628.5
• DOI: 10.1016/j.jclepro.2018.07.201
• Languages: English
• ISSNs: 0959-6526

Abstract

Abstract: A sequencing batch reactor (SBR) was operated more than 200 d to treat nitrogen-rich saline wastewater by anammox process. The temperature was controlled at 35 ± 0.5 °C and the mixed liquor suspended solids (MLSS) was around 4000 mg TSS/L. Anammox reactor could gradually acclimate to 100% seawater. However, the long-term effects of 50% seawater not only affected nitrogen removal performance, resulting in a decrease of nitrogen removal rate (NRR) to 0.114 kg N/(m 3 ·d), but also weakened sludge settling ability. The effect resulting from 50% seawater was reversible and the NRR gradually increased to 0.419 kg N/(m 3 ·d) by adding sponge carriers. Analysis of variance (ANOVA) test shown that △NO3 − -N/△NH4 + -N ratio was significantly different ( p < 0.05) under different seawater content. After inhibition resulting from 100% seawater, the response process of anammox could be divided into three periods. At 100% seawater, nitrogen removal performance of anammox reactor was affected when influent nitrite was higher than 150 mg N/L (NO2 − -Ninf /NH4 + -Ninf = 1.37 ± 0.02). Luong model was suitable to analyze inhibitory effect resulting from nitrite under saline surroundings. Graphical abstract: Image 1 Highlights: NRR of anammox at 100% seawater content was 0.52 kg/(m 3 ·d). Anammox response process after saline inhibition could be divided into three periods. Sponge carriers were added to improve biomass retention at high salt concentration. Re-modified Logistic model could describe anammox recovery process at 100% seawater. Nitrogen removal was affected little when influent nitrite was no more than 150 mg/L.