Abstract
Abstract
Degradation of perchlorate was investigated using acclimated active sludge with acetate or pyruvate as the electron donor in sequencing batch mode. Perchlorate degraded with either of the two electron donors and the Michaelis-Menten model fit the experimental data well. The kinetic parameters qmax and Ks for acetate were 6.56–7.68 (mg ClO4−/(gVSS·h)) and 9.92–23.19 (mg/L), respectively, which were higher than the corresponding values for pyruvate (6.31–6.41 (mg ClO4−/(gVSS·h) and 3.54–22.29 (mg/L)). To reduce the same amount of perchlorate, the required dosage of acetate and the secondary pollution were lower compared with pyruvate, indicating that acetate was more suitable for the heterotrophic reduction of perchlorate. The highest reaction rate was reached at pH 7.0 for acetate and at pH 8.0 for pyruvate. Coexisting nitrate had a significant negative effect on perchlorate reduction. Moreover, high-throughput sequencing method revealed that Dechloromonas was the predominant perchlorate-reducing bacteria (PRB) with either acetate or pyruvate as the electron donor. These results offered helpful hints for heterotrophic perchlorate reduction process with different electron donors.
Get full access to this article
View all access options for this article.
References
Supplementary Material
Please find the following supplemental material available below.
For Open Access articles published under a Creative Commons License, all supplemental material carries the same license as the article it is associated with.
For non-Open Access articles published, all supplemental material carries a non-exclusive license, and permission requests for re-use of supplemental material or any part of supplemental material shall be sent directly to the copyright owner as specified in the copyright notice associated with the article.
