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dissolvedoxygen, etc ; ammonia; ammonium; anaerobic ammonium oxidation; nitrites; oxidants; oxidation; sludge; China; Show all 9 Subjects
Abstract:
... Residual ammonium is a critical parameter affecting the stability of mainstream partial nitritation/anammox (PN/A), but the underlying mechanism remains unclear. In this study, mainstream PN/A was established and operated with progressively decreasing residual ammonium. PN/A deteriorated as the residual ammonium decreased to below 5 mg/L, and this was paralleled by a significant loss in anammox ac ...
dissolvedoxygen, etc ; carbon; catalysts; catalytic activity; energy; polymers; wastewater treatment; water purification; China; Show all 9 Subjects
Abstract:
... Excessive consumption of energy and resources is a major challenge in wastewater treatment. Here, a novel heterogeneous Fenton-like catalyst consisting of Cu-doped graphene-like catalysts (Cu-GCD NSs) was first synthesized by an enhanced carbothermal reduction of β-cyclodextrin (β-CD). The catalyst exhibits excellent Fenton-like catalytic activity for the degradation of various pollutants under ne ...
dissolvedoxygen, etc ; cold; eutrophication; lakes; mathematical models; methane; methane production; sediments; sulfates; uncertainty; China; Show all 11 Subjects
Abstract:
... Clarifying the role of sulfate and dissolved oxygen (DO) in methane production may allow for precise and accurate modeling of methane emissions in eutrophic lakes. We conducted field observations of sulfate, methane, and DO concentrations in Lake Abashiri, a typical brackish and eutrophic lake in a cold region, to develop a DO-based method for quantitively estimating methane production in a eutrop ...
... As various aptasensors are adopted in clinical diagnosis, the development of convenient multiple-target determination is a field of ever-increasing interests. Herein, a label-free and amplified electrochemiluminescence (ECL) sensing platform was constructed to detect multiple targets of hemin, glucose and thrombin (TB) using peroxydisulfate (S₂O₈²⁻) solution, which was one of the most convenient a ...
dissolvedoxygen, etc ; Internet; aquaculture; batteries; electric power; energy; hydrogen; salinity; solar energy; temperature; turbidity; water quality; Thailand; Show all 13 Subjects
Abstract:
... This study presents a standalone photovoltaic (PV)/battery energy storage (BES)-powered water quality monitoring system based on the narrowband internet of things (NB-IoT) for aquaculture. (1) A PV/BES system was used as the main energy system of the monitoring system. The PV and BES capacities were optimized to provide uninterrupted electrical energy to the monitoring system, taking into account ...
dissolvedoxygen, etc ; algorithms; calibration; luminescence; oxygen; seawater; Show all 6 Subjects
Abstract:
... Oxygen sensors based on luminescence quenching are the most commonly used instruments for in situ measurement in seawater due to their accuracy and long-term stability. The calibration method of the sensor is crucial for their accuracy. Conventional methods exhibit some defects, such as strict control of calibration conditions and cumbersome and time-consuming operation. To improve calibration ope ...
dissolvedoxygen, etc ; copolymerization; hydrophilicity; mussels; permeability; polyethyleneimine; porosity; Show all 7 Subjects
Abstract:
... The key to membrane separation technology is to enhance membrane selectivity while ensuring high permeability. The modification of polydopamine (PDA) deposition based on mussel bionics is an important method to prepare hydrophilic membranes, in which the slow PDA deposition rate and nonuniformity are the keys to the strategy. In this work, a novel in-situ aeration-assisted PDA/PEI copolymerization ...
dissolvedoxygen, etc ; estuaries; heavy metals; risk; risk assessment; sulfides; Show all 6 Subjects
Abstract:
... In this study, the impacts of dissolved oxygen (DO) on dynamics concentrations of heavy metals (Cu, Cd, Cr, and Pb) from estuary sediments were investigated in a 49-day laboratory simulation. The exchange flux method, Bureau Communautaire de Référence (BCR) sequential extraction procedure, and risk assessment code (RAC) were used to analyze the behavior of heavy metals. The results indicated that ...
dissolvedoxygen, etc ; aeration; alum; environmental management; overdose; phosphorus; wastewater; Show all 7 Subjects
Abstract:
... Dosing alum to remove phosphorus (P) from wastewater is a common practice. However, the dosing-location and quantity of alum required to meet P discharge limits are vaguely defined. As such, utilities overdose alum to avoid noncompliance, but this leads to wastage and costs. This study aimed to address this issue through a long-term evaluation of an alum-assisted full-scale intermittently decanted ...
dissolvedoxygen, etc ; data collection; models; temperature; time series analysis; Show all 5 Subjects
Abstract:
... This paper presents a novel spatio-temporal LSTM (SPATIAL) architecture for time series forecasting applied to environmental datasets. The framework was applied for three different ocean datasets: current speed, temperature, and dissolved oxygen. Network implementation proceeded in two directions that are nominally separated but connected as part of a natural environmental system – across the spat ...
dissolvedoxygen, etc ; Bayesian theory; algorithms; automation; chlorophyll; lakes; models; France; Show all 8 Subjects
Abstract:
... An automated calibration method is proposed and applied to the complex hydro-ecological model Delft3D-BLOOM which is calibrated from monitoring data of the lake Champs-sur-Marne, a small shallow urban lake in the Paris region (France). This method (ABC-RF-SA) combines Approximate Bayesian Computation (ABC) with the machine learning algorithm Random Forest (RF) and a Sensitivity Analysis (SA) of th ...
dissolvedoxygen, etc ; bisphenol A; catalysts; environment; mineralization; oxygen; remediation; synergism; Show all 8 Subjects
Abstract:
... In this work, a Mn₂O₃/Mn₃O₄-Cu₁.₅Mn₁.₅O₄ spinel was fabricated and utilised as a catalyst to activate peroxydisulfate (PDS) leading to degradation of bisphenol A (BPA). The results showed that the system exhibited an excellent turnover frequency (TOF) of 2.7 × 10⁻³ s⁻¹ and high stability. The amount of ion leaching was small and the degree of mineralisation was up to 66.2%. Superoxide radicals (O₂ ...
dissolvedoxygen, etc ; anaerobic ammonium oxidation; diffusivity; nitrogen; technology; total nitrogen; Show all 6 Subjects
Abstract:
... This work studied the impacts of key granule properties on the granular reactor performing partial nitritation/anammox from the modeling perspective. The results could guide not only future reliable modeling but also practical startup/operation of the reactor. To achieve high total nitrogen (TN) removal whilst avoiding significant N₂O production, inoculated granules should be big and anammox-enric ...
dissolvedoxygen, etc ; aeration; estuaries; flocculation; fractionation; liquids; river water; salinity; Show all 8 Subjects
Abstract:
... Multiple parameters may affect the fate of metals between solid and liquid phases in estuarine zones. The present investigation brings out the roles of salinity and dissolved oxygen (DO) in flocculation of colloidal metals and their subsequent remobilization during estuarine mixing. For this purpose, a series of aquaria containing river water with different salinity regimes under both natural and ...
dissolvedoxygen, etc ; lakes; organic matter; phosphorus; sediment-water interface; sediments; Show all 6 Subjects
Abstract:
... Lake restoration (typically sediment dredging) commonly involves producing a new sediment-water interface (SWI). This study comprehensively investigated the migration and transformation of P during the formation of a new SWI under different dissolved oxygen (DO) levels in the overlying water, based on Fe/Al-rich sediment. The results suggest that DO had a profound effect on the 0–7 cm sediment lay ...
dissolvedoxygen, etc ; Proteobacteria; ammonia; ammonium; bioreactors; denitrification; nitrates; pyrite; sulfates; sulfur; Show all 10 Subjects
Abstract:
... Sulfur-based autotrophic denitrification (SAD) and pyrite-based autotrophic denitrification (PAD) are important technologies that address nitrate pollution, but high sulfate production and low denitrification efficiency, respectively, limit their application in engineering. A bio-denitrification reactor with sulfur and pyrite as filler materials was studied to remove NO₃–-N from nitrate contaminat ...
dissolvedoxygen, etc ; ammonium; cost effectiveness; liquids; nitrogen; oxygen; research; simulation models; Show all 8 Subjects
Abstract:
... The single PN-A (partial nitrification-anammox) reactor offers a cost-effective solution for nitrogen removal. However, optimal control of the PN-A reactor is challenging due to the interactive mechanisms among the oxygen supply, bulk liquid DO (dissolved oxygen) concentration, and the balance of various functional bacterial species. In this study, a mathematical model was used to derive the optim ...
dissolvedoxygen, etc ; air; air flow; algae culture; algorithms; mass transfer; photobioreactors; Show all 7 Subjects
Abstract:
... Raceway reactors are still the most extensive technology for microalgae production. However, these reactors have some drawbacks, one of them being a low mass transfer capacity, which provokes dissolved oxygen accumulation and thus reduction of system performance. To overcome this problem, it is imperative to improve the photobioreactor design as well as the operating conditions. One solution is to ...
dissolvedoxygen, etc ; Nitrosomonas; ammonium; hydroxylamine; nitrification; nitrites; nitrogen; research; sludge; water; Show all 10 Subjects
Abstract:
... Hydroxylamine is a nitrogen intermediate of ammonium oxidizing bacteria (AOB) that can transiently accumulate during nitrification. The impact of hydroxylamine on aerobic ammonium oxidations is still obscure. In the present study the short and long term impact of hydroxylamine on partial nitritation granular sludge was investigated. Dissolved oxygen was the governing factor determining the hydroxy ...
dissolvedoxygen, etc ; chlorophyll; chronic exposure; corals; endosymbionts; photosynthesis; seawater; New Caledonia; Show all 8 Subjects
Abstract:
... Extreme reef environments have become useful natural laboratories to investigate physiological specificities of species chronically exposed to future-like climatic conditions. The lagoon of Bouraké in New Caledonia (21°56′56.16′′ S; 125°59′36.82′′ E) is one of the only reef environments studied where the three main climatic stressors predicted to most severely impact corals occur. In this lagoon, ...