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3 results on '"Ammonium"'

1. Discrepant effects of undissolved and dissolved fractions of biochar on the nitrogen removal performance of anaerobic ammonium oxidation process.

Author

Xu, Jia-Jia, Xue, Tong-Zhan, Li, Wei-Hua, and Jin, Ren-Cun

Subjects
*DISSOLVED organic matter, *NITROGEN, *BIOCHAR, *WASTEWATER treatment, *AMMONIUM, *ORGANIC compounds, *ANAEROBIC digestion
Abstract

[Display omitted] • UDB and DB at different pyrolysis temperatures played contrasting roles. • DB800-amended group displayed superior nitrogen removal performance. • DB at lower pyrolysis temperature imposed suppression. • Properties of dissolved organic matter released by DB were tracked at molecular level. Biochar has attracted increasingly attention in the biological wastewater treatment owing to its unique environmental behavior. However, the differential effects of undissolved and dissolved fractions of biochar (hereafter named as UDB and DB, respectively) on the anaerobic ammonium oxidation (anammox) process remain unclear. The study evaluated the nitrogen removal performance of anammox system in response to UDB and DB prepared at different pyrolysis temperatures (300 °C, 550 °C and 800 °C). The DB800-amended group displayed superior nitrogen removal performance with the total nitrogen removal efficiency (TNRE) of 92.8 ± 1.4 %. Compared with CK, TNRE was changed by +5.0 % (UDB300), +0.4 % (UDB550) and −22.3 % (UDB800) for UDB-amended groups, and by −16.0 % (DB300), −9.4 % (DB550), and +9.2 % (DB800) for DB-amended groups, respectively. The differences were closely related to the physicochemical properties of UDB and DB. Particularly, dissolved organic matter released by DB were tracked at molecular level, which revealed that CHO occupied the highest proportion of 70.3 % and lignin-like and carboxylic rich alicyclic molecules were dominant in DB800. This study would facilitate the understanding of the differences between the nitrogen removal performance of UDB and DB-amended anammox, thus providing deeper insights for the comprehensive assessment of the impacts of biochar on the anammox process. [ABSTRACT FROM AUTHOR]

Published
2024
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2. Feasibility of in situ enriching anammox bacteria in a sequencing batch biofilm reactor (SBBR) for enhancing nitrogen removal of real domestic wastewater

Author

Liang Zhang, Jianhua Zhang, Qiong Zhang, Yuanyuan Miao, Yongzhen Peng, Sun Yawen, and Xiyao Li

Subjects
biology, Chemistry, General Chemical Engineering, 0208 environmental biotechnology, chemistry.chemical_element, 02 engineering and technology, General Chemistry, 010501 environmental sciences, biology.organism_classification, Pulp and paper industry, 01 natural sciences, Anoxic waters, Nitrogen, Industrial and Manufacturing Engineering, 020801 environmental engineering, chemistry.chemical_compound, Wastewater, Anammox, Environmental Chemistry, Nitrification, Ammonium, Effluent, Bacteria, 0105 earth and related environmental sciences
Abstract

In this study, enhanced removal of nitrogen from real domestic wastewater with low organic carbon to nitrogen ratio of 2.1–3.6 was achieved in a sequencing batch biofilm reactor (SBBR) with enriching anammox bacteria in situ. The SBBR was inoculated with ordinary nitrification sludge and operated under alternative anaerobic, aerobic and anoxic patterns. During the start-up period, influent nitrogen and carbon loading rate gradually increased. According to the quantitative microbial analysis, the growth of ammonium oxidizing bacteria and anammox bacteria were promoted, resulting in an increase from 6.56 × 104 to 1.51 × 107 and from 1.11 × 104 to 1.69 × 106 gene copies·mL−1, respectively. During the steady period (Day 102–205), nitrogen removal efficiency of 88.2% was achieved with an effluent total nitrogen of 6.3 mg N·L−1 for average influent ammonium of 53.9 ± 4.0 mg·L−1. Nitrogen removal was steady when temperature decreased from 27.0 to 12.8 °C. Variations in nitrogen compounds suggested that anammox reaction could be the main pathway for nitrogen removal, according to the results of activity batch and continuous tests. For the high nitrogen removal performance, biofilm and post-anoxic unit could play important roles. Overall, this study provided an alternative method to improve the removal of nitrogen from sewage by directly enriching anammox bacteria.

Published
2018

3. Nitrogen removal from low COD/TIN real municipal sewage by coupling partial denitrification with anammox in mainstream

Author

Jianwei Li, Lan Yang, Liyan Deng, Ruitao Gao, Rui Du, Yongzhen Peng, and Ming Wang

Subjects
Denitrification, General Chemical Engineering, chemistry.chemical_element, Sewage, 02 engineering and technology, 010402 general chemistry, 01 natural sciences, Industrial and Manufacturing Engineering, chemistry.chemical_compound, Environmental Chemistry, Ammonium, Effluent, biology, Chemistry, business.industry, General Chemistry, 021001 nanoscience & nanotechnology, biology.organism_classification, Nitrogen, 0104 chemical sciences, Anammox, Environmental chemistry, 0210 nano-technology, Tin, business, Bacteria
Abstract

The application of partial denitrification coupling with anammox (PD/A) in municipal sewage treatment is one of the most promising research field, and it has just begun. In 548 days of experiment treating real domestic sewage, the continuous flow reactor was started up by adding biocarriers containing anammox bacteria and operated stably after acclimatization. The PD/A was successfully achieved in the step-feed AO system. Furthermore, mass balance of ammonium revealed that anammox could contribute 32–47% to nitrogen loss. Compared with no biocarriers addition phase, the nitrogen removal efficiency (NRE) increased to 77.8 ± 4.3% and the effluent total inorganic nitrogen (TIN) decreased to 11.0 ± 2.1 mg/L at the COD/TIN ratio of 2.9 from day 428 to day 548 under the condition of anammox biocarriers addition and without external carbon source. Quantitative polymerase chain reaction (qPCR) and high-throughput sequencing analysis showed that anammox bacteria on the biological carrier accounted for 3.06% of the total bacteria in the stable phase, which was much higher than the reported

Published
2021

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