Effect of chromium on granule-based anammox processes. (July 2018)

• Record Type: Journal Article
• Authors: Jiang, Xiao-Yan; Cheng, Ya-Fei; Zhu, Wei-Qin; Bai, Yu-Hui; Xu, Lian-Zeng-Ji; Wu, Xue-Qi; Jin, Ren-Cun
• Is Part Of: Bioresource technology. Volume 260(2018)
• Page Start: 1
• Page End: 8
• Publication Date: 2018-07
• Subjects: Anammox granules -- Chromium -- Pre-exposure -- Granule characteristics; 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.2018.03.055
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: Long-term effects of Cr(VI) on anammox granules were evaluated for the first time. Mathematical models used to quantify the performance fit the experimental data well. LB-EPS and TB-EPS neutralized 93.9% of the chromium at 60 mg L −1 Cr(VI). Cr(VI) exhibited severe negative effects on anammox reactors after long-term operation. Anammox performance can be enhanced after a recovery from long-term inhibition. Abstract: In this study, the feasibility of application of anaerobic ammonium oxidation (anammox) to teat wastewater containing chromium was assessed. Anammox granule activity decreased with increasing Cr(VI) concentration and pre-exposure time in batch tests, and the 50% inhibition concentration of Cr(VI) on anammox biomass was 296.5 mg L −1 . Approximately 93.9% chromium was absorbed by loosely bound-extracellular polymeric substances and tightly bound-extracellular polymeric substances when less than 60 mg L −1 Cr(VI) was added. During long-term operation in up-flow anaerobic sludge blanket reactor, significant inhibitory effects anammox performance were observed for Cr(VI) concentrations up to 2 mg L −1 . The nitrogen removal rate (NRR) rapidly decreased to 1.49 ± 0.89 kg N m −3 d −1, whereas the NRR was 11.37 ± 1.30 kg N m −3 d −1 in a control reactor. Compared with initial levels, specific anammox granule activity was 22%. The tolerance of the anammox process to Cr(VI) can be enhanced after a long-term adaptive phase.