Mechanisms of N2O production in salinity-adapted partial nitritation systems for high-ammonia wastewater treatment

Water Research X, Год журнала: 2025, Номер 27, С. 100311 - 100311

Опубликована: Фев. 3, 2025

Partial Nitritation/Anammox (PN/A) can achieve green, economical, and efficient biological nitrogen removal; however, the PN process contributes significantly to nitrous oxide (N2O, third most important greenhouse gas) emissions. Balancing stability of systems while reducing N2O emissions, particularly under varying salinity conditions, is a key challenge in applying PN/A for high-salinity high-ammonia wastewater treatment. This study explored long-term effects on performance emissions treating wastewater. The results showed that specific ammonia oxidation rates control two salinity-acclimated reactors were 78.84, 75.03, 42.60 mg N/(g VSS·h), indicating low (2.5 g NaCl/L) had minimal effect, high (10 inhibited ammonia-oxidating bacteria associated nitritation processes. Moreover, emission factors increased from 0.08 ± 0.04% 0.24 0.03% as rose 0 10 NaCl/L. Further analysis revealed stimulated production both aerobic anoxic stages. Particularly, by 2.84-11.14 times aerated stage 0.61-2.04 nonaerated (i.e. settling stages). Isotopic pathway indicated enhanced primarily stimulating nitrite reduction pathway. Additionally, mechanism investigation examined combined salinity-induced changes sludge properties microbial community These findings provide valuable insights treat high-strength understanding mechanisms

Язык: Английский

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Contrasting effects of temperature rise in different seasons on larger and smaller phytoplankton assemblages in a temperate coastal water, Laoshan Bay, northern Yellow Sea, China

Marine Environmental Research, Год журнала: 2025, Номер 206, С. 107034 - 107034

Опубликована: Фев. 25, 2025

Язык: Английский

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First genetic and morphological records of Balloon Alfonsin, Beryx mollis egg and larvae

Journal of the Marine Biological Association of the United Kingdom, Год журнала: 2025, Номер 105

Опубликована: Янв. 1, 2025

Abstract Despite the importance of commercially harvested benthopelagic fish Beryx mollis , little information is available on their adult phase and reproduction. This likely due to low abundance this species compared splendens decadactylus as well misidentification spp. In study, early life stages B. were found in southwest region off Sri Lanka during a survey with research vessel Dr Fridtjof Nansen 2018, coinciding monsoon period. As morphological characteristics eggs larval three are very similar, visual identification differentiate level has always been challenging. Therefore, DNA barcoding was carried out targeting mitochondrial COI gene. Molecular analysis confirmed that collected egg larvae belonged high identity (>99%) reference previously submitted sequences GenBank. Phylogenetic showed closer evolutionary relationship among than . To best our knowledge first genetic confirmation worldwide suggests coastal area Lanka, north central Indian Ocean, potential spawning ground for species.

Язык: Английский

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Skill comparisons and physical drivers of multi-decadal rapid warming of Indian Ocean in CMIP6 models

Climate Dynamics, Год журнала: 2025, Номер 63(5)

Опубликована: Май 1, 2025

Язык: Английский

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Effects of climate warming on energetics and habitat of the world's largest marine ectotherm

The Science of The Total Environment, Год журнала: 2024, Номер 951, С. 175832 - 175832

Опубликована: Авг. 26, 2024

Responses of organisms to climate warming are variable and complex. Effects on species distributions already evident mean global surface ocean temperatures likely warm by up 4.1 °C 2100, substantially impacting the physiology ectotherms. The largest marine ectotherm, whale shark Rhincodon typus, broadly prefers sea (SST) ranging from 23 30 °C. Whole-species distribution models have projected a poleward range shift under future scenarios change, but these do not consider intraspecific variation or phenotypic plasticity in thermal limits when modelling responses, impact energetic requirements sharks is unknown. Using dataset 111 movement tracks aggregation sites five countries across Indian Ocean latest Earth-system produced Coupled Model Intercomparison Project Phase 6 for Intergovernmental Panel Climate Change, we examined how SST total zooplankton biomass, their main food source, may change future, what this means balance extent suitable habitat sharks. Earth System Models, three Shared Socioeconomic Pathways (SSPs; SSP1-2.6, SSP3-7.0 SSP5-8.5), project that 2100 four regions where aggregations found will increase 4.9 relative present, while biomass decrease. This reduction be accompanied an because warmer water metabolic rate. We marked differences changes comparing whole-species model one including regional variation. suggests conventional approach combining data different within species' could underestimate amount local adaptation populations, although parameterising also suffer having insufficient lead mis-specification highly uncertain estimates. Our study highlights need further research into tolerances energetics, complexities involved projecting responses potential importance considering building models.

Язык: Английский

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Indian Ocean Acidification and Its Driving Mechanisms Over the Last Four Decades (1980–2019)

Global Biogeochemical Cycles, Год журнала: 2024, Номер 38(9)

Опубликована: Сен. 1, 2024

Abstract This paper aims to study the changes in Indian Ocean seawater pH response sea‐surface temperature, salinity, dissolved inorganic carbon (DIC), and total alkalinity (ALK) over period 1980–2019 its driving mechanisms using a high‐resolution regional model outputs. The analysis indicates that rate of change declining Arabian Sea (AS), Bay Bengal (BoB), Equatorial (EIO) is −0.014 0.002, 0.001, −0.015 0.001 unit dec −1 , respectively. Both AS BoB (EIO), highest (lowest) decadal DIC trend found during 2000–2009. surface acidification has accelerated throughout IO region 2010–2019 compared previous decades. Further, our El Ninõ positive Dipole events lead an enhancement acidification. increasing anthropogenic CO 2 uptake by ocean dominantly controls 80% (94.5% 85.7%) net (1980–2019) (BoB EIO), whereas warming 14.4% (13.4% 7.0%) trends EIO). ALK contribute enhancing 5.0%. dominates after EIO and, similar AS, contributes negative 10.7%. In contrast, it buffering effect BoB, suppressing −5.4%.

Язык: Английский

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Field evidence and modeling validation of biogeochemical controls on the deposition of persistent organic pollutants in the deep ocean

Journal of Hazardous Materials, Год журнала: 2024, Номер 480, С. 136395 - 136395

Опубликована: Ноя. 4, 2024

Язык: Английский

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Aggregating Synechococcus contributes to particle organic carbon export in coastal estuarine waters: Its lineage features and assembly processes

The Science of The Total Environment, Год журнала: 2024, Номер 917, С. 170368 - 170368

Опубликована: Янв. 26, 2024

Язык: Английский

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Intensified surface chlorophyll responses to the Indian ocean dipole under greenhouse warming

Environmental Research Letters, Год журнала: 2024, Номер 19(6), С. 064072 - 064072

Опубликована: Май 20, 2024

Abstract The Indian Ocean Dipole (IOD) has been proposed to be a key driver of biological processes in the (IO) present climate. Given expected influence global warming on both properties IOD and biogeochemistry within IO, question arises: How will relationship between surface chlorophyll evolve climate? Here, utilizing simulations from Coupled Model Intercomparison Project Phase 6 Earth System models, our findings reveal notable intensification IOD-chlorophyll under greenhouse warming. This is linked an increase during June November period positive years southeastern IO (SEIO). Interestingly, analysis indicates substantial rise IOD-related levels climate, despite marked decrease IOD-induced upwelling SEIO. shallower thermocline leads mean nutrient concentration subsurface layer, thereby facilitating enhanced anomalous supply which contributes increased chlorophyll. Our study highlights consequential effects dynamics underscores need for improved coupled models advance understanding biophysical interactions response

Язык: Английский

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Intensified Responses of Phytoplankton to the Indian Ocean Dipole Under Greenhouse Warming

Research Square (Research Square), Год журнала: 2024, Номер unknown

Опубликована: Фев. 8, 2024

Abstract The Indian Ocean Dipole (IOD) has been proposed to be a key driver of biological processes in the (IO) present climate. Given expected influence global warming on both properties IOD and biogeochemistry within IO, question arises: How will relationship between chlorophyll evolve climate? Here, utilizing simulations from Coupled Model Intercomparison Project (CMIP) Phase 6 Earth System models, our findings reveal notable intensification IOD-chlorophyll under greenhouse warming. This is linked an increase phytoplankton biomass during June November period positive years southeastern IO (SEIO). Interestingly, analysis indicates substantial rise IOD-induced levels climate, despite marked decrease upwelling SEIO. shallower thermocline leads mean nutrient concentration subsurface layer, thereby facilitating enhanced anomalous supply surface which contributes increased biomass. Our study highlights consequential effects dynamics underscores need for improvement Models resolve understanding biophysical interactions response

Язык: Английский

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