A novel control strategy for the partial nitrification and anammox process (PN/A) of immobilized particles: Using salinity as a factor. (April 2020)

• Record Type: Journal Article
• Authors: Liu, Chengcheng; Yu, Deshuang; Wang, Yanyan; Chen, Guanghui; Tang, Peng; Huang, Shuo
• Is Part Of: Bioresource technology. Volume 302(2020)
• Publication Date: 2020-04
• Subjects: Immobilized particles -- Partial nitrification -- Anammox -- Salinity; 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.2020.122864
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: Improved the mechanical strength and mass transfer performance of PVA-SA-immobilized particles by adding PEG. Investigated the effects of different salinities on the partial nitrification and anammox processes. Realized the stable operation of PN/A by adding salinity and performed genome-wide analysis on the changes in bacteria. Abstract: The impact of the addition of salinity on partial nitrification and anammox (PN/A) was investigated in this study. The sludge was immobilized by polyethylene glycol (PEG)-modified polyvinyl alcohol (PVA)-sodium alginate (SA) immobilization technology, and the effective diffusion coefficient ( De ) of the immobilized particles was measured to be 0.313 × 10 −9 m 2 ·s −1, indicating that the system has excellent mass transfer performance. An experiment was carried out by adding NaCl to create a salinity gradient. It was found that the initiation of partial nitrification was achieved at a concentration of 10 g·L −1 NaCl and the nitrite accumulation rate (NAR) reached 81.03%, which could provide sufficient NO2 − -N for subsequent anammox. Additionally, an anammox reactor operating at the same salinity maintained a stable state after acclimation, and the removal rates of NH4 + -N and NO2 − -N reached 80%. The dominant population in the anammox system was Planctomycetes . Salinity is a feasible factor for controlling the PN/A process.