Anammox has been widely used for denitrification from different wastewaters due to its low energy and carbon sources consumption. Nevertheless, the presence of nitrate in the effluent has been found to impede the enhancement of total nitrogen removal efficiency (TNRE). In this study, anammox was employed in conjunction with sulfur autotrophic denitrification (SAD) in order to enhance TNRE. During a long-term test in an UASB reactor with 30 mg L ammonium influent concentration, it was observed that sulfide facilitated both nitrate removal efficiency (NRE) and TNRE. Specifically, compared with 0 mg L sulfide addition, the NRE and TNRE were enhanced from 92.55% and 74.56% to 94.10% and 89.51%, respectively with 10 mg L sulfide. However, with sulfide concentration increased to 20 mg L, 81.13% of TNRE was only found. Notably, the anammox performance was observed to enhancement when the sulfide level was reduced to 0 mg L again, the result indicated that the inhibitory effect of 20 mg L sulfides can be reversed. Further exploration revealed that sulfide not only suppressed the activity of nitrifying bacteria but also acted as electron donor, aiding the conversion of NO-N to N through SAD process, this made the nitrate in effluence as low as 2.31 mg L. The results of microbiological analysis demonstrated that the population of microorganisms associated with SAD increased in response to the addition of sulfide. The findings suggested a potential equilibrium and collaboration between SAD and anammox to further increase TNRE in low-strength ammonium wastewater treatment.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.jenvman.2024.122583 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Synthesis and Reactivity of a Bipyridyl Tantalum Complex.
Inorg Chem
January 2025
Testing and Analysis Center, Hebei Normal University, Shijiazhuang 050024, China.
The bipyridyl tantalum complex (2,6-PrCHO)Ta(bipy) () is synthesized by the reaction of (2,6-PrCHO)TaCl () and 2,2'-bipyridine in the presence of excess potassium graphite (KC). Complex coordinates readily with pyridine and 4-(dimethylamino)pyridine (dmap) to form Lewis base adducts (2,6-PrCHO)Ta(bipy)(L) (L = py (), dmap ()), and it exhibits rich redox reactivity toward small molecules: (a) single electron transfer (SET) occurs upon exposure of to phenyl sulfide or selenide dimer, giving the open-shell, bipy-centered radical complexes (2,6-PrCHO)Ta(bipy)(PhE) (E = S (), Se ()). (b) Regioselective C-C σ-bond formation via radical coupling is observed in the SET reaction of and aldehydes, ketones, or imines to furnish insertion products -, namely, sterically more crowded benzophenone, acetophenone, 2,6-dichlorobenzaldehyde, and benzophenone imine couple with C6 or C6' of bipy in , respectively, whereas sterically less hindered benzaldehyde, cyclohexanone, and benzylideneaniline couple with C2 or C2' of bipy, respectively.
View Article and Find Full Text PDFDual-Oxide Bridge-Trap Structure via Atomic Layer Infiltration for Enhanced Performance of Quantum Dot Photodetector.
Nano Lett
January 2025
School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
Achieving high-performance lead sulfide quantum dot (PbS QD)-based photodetectors requires enhanced carrier transfer, which inevitably leads to an increased dark current. Balancing a high photocurrent and low dark current is crucial. In this work, a bridge-trap structure constructed by the atomic layer deposition of dual oxides is proposed to simultaneously enhance photoresponse performance and reduce dark current.
View Article and Find Full Text PDFSulfide-rich continental roots at cratonic margins formed by carbonated melts.
Nature
January 2025
School of Natural Sciences, Macquarie University, North Ryde, New South Wales, Australia.
The cratonic crust contains abundant mineral deposits of metals such as gold, copper and rare earths and is underlain by a thick mantle lithosphere rich in the volatiles carbon, sulfur and water. Although volatiles are known to be key components in metallogenesis, how and where they are distributed in the cratonic lithosphere mantle and their role in the initial enrichment of metals have not been sufficiently explored. Here we compile sulfur and copper contents of global cratonic peridotites, identifying sulfide-rich and copper-rich continental roots at depths of 160-190 km at cratonic margins.
View Article and Find Full Text PDFIdentifying Bacteria Responsible for Non-Sulphate-Based Hydrogen Sulphide Production in Aquaculture.
Environ Microbiol
January 2025
DTU Aqua, Section for Aquaculture, Technical University of Denmark, Hirtshals, Denmark.
The unintended microbiological production of hydrogen sulphide (HS) poses a significant challenge in engineered systems, including sewage treatment plants, landfills and aquaculture systems. Although sulphur-rich amino acids and other substrates conducive to non-sulphate-based HS production are frequently present, the capacity and potential of various microorganisms to perform sulphate-free HS production remain unclear. In this study, we identify the identity, activity and genomic characteristics of bacteria that degrade cysteine to produce HS in anaerobic enrichment bioreactors seeded with material from aquaculture systems.
View Article and Find Full Text PDFVegetables containing sulfur compounds promote trans-isomerization of unsaturated fatty acids in triacylglycerols during the cooking process.
Food Res Int
January 2025
Faculty of Science & Technology, Meijo University, 1-501 Shiogamaguchi, Tempaku-ku, Nagoya, Aichi 468-8502, Japan; Graduate School of Environmental and Human Sciences, Meijo University, 1-501 Shiogamaguchi, Tempaku-ku, Nagoya, Aichi 468-8502, Japan. Electronic address:
Growing evidence indicates that the intake of trans-fatty acids (TFAs) has been associated with a higher risk of cardiovascular disease; therefore, various industrial measures have been taken to reduce the amount of TFAs consumed. However, research on TFAs formed during cooking is limited. Isothiocyanates and polysulfides, which are widely distributed in various vegetables, have recently been shown to promote the cis-trans isomerization of double bonds.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!