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Issue 6, 2019

Long-term performance evaluation of an anoxic sulfur oxidizing moving bed biofilm reactor under nitrate limited conditions

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Abstract

An anoxic sulfur-oxidizing moving bed biofilm reactor (MBBR) treating sulfur and nitrate-contaminated synthetic wastewater was monitored for 306 days under feed nitrogen-to-sulfur (N/S) molar ratios of 0.5, 0.3 and 0.1. Thiosulfate (S2O32−) removal efficiencies (RE) exceeding 98% were observed at a N/S ratio of 0.5 and a S2O32− loading rate of 0.9 g S2O32−–S L−1 d−1, whereas a RE of 82.3 (±2.6)% and 37.7 (±3.4)% were observed at N/S ratios of 0.3 and 0.1, respectively. Complete nitrate (NO3) removal was obtained at all tested N/S ratios. A comparison of the kinetic parameters of the MBBR biomass under the same stoichiometric conditions (N/S ratio of 0.5) revealed a 1.3-fold increase of the maximum specific rate of S2O32− oxidation (rmax) and a 30-fold increase of the affinity constant for S2O32− (Ks) compared to those observed after long-term NO3 limitation (N/S ratio of 0.1). The MBBR showed optimal resilience to NO3 limitation as the S2O32− RE recovered from 37.3% to 94.1% within two days after increasing the N/S ratio from 0.1 to 0.5. Based on PCR-DGGE analysis, sulfur-oxidizing nitrate-reducing bacteria, i.e. Thiobacillus sp. and Sulfuritalea sp., dominated in the MBBR biofilm during the entire study.

Graphical abstract: Long-term performance evaluation of an anoxic sulfur oxidizing moving bed biofilm reactor under nitrate limited conditions

Supplementary files

Article information


Submitted
16 Mar 2019
Accepted
24 Apr 2019
First published
29 Apr 2019

This article is Open Access

Environ. Sci.: Water Res. Technol., 2019,5, 1072-1081
Article type
Paper

Long-term performance evaluation of an anoxic sulfur oxidizing moving bed biofilm reactor under nitrate limited conditions

R. Khanongnuch, F. Di Capua, A. Lakaniemi, E. R. Rene and P. N. L. Lens, Environ. Sci.: Water Res. Technol., 2019, 5, 1072 DOI: 10.1039/C9EW00220K

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