U.S. flag

An official website of the United States government

PubAg

Main content area

You searched for: Subject "dissolved oxygen" Remove constraint Subject: "dissolved oxygen"
Start Over

Search

7,714  Search Results

« Previous | 1 - 20 of 7,714 |
Number of results to display per page

Search Results

1. Effects of artificially induced complete mixing on dissolved organic matter in a stratified source water reservoir

Author:
Zhao, Lingyun; Li, Nan; Huang, Tinglin; Zhang, Haihan; Si, Fan; Li, Kai; Qi, Yunzhi; Hua, Fengyao; Huang, Cheng
Source:
Journal of environmental sciences (China) 2022 v.111 pp. 130-140
ISSN:
1001-0742
Subject:
dissolved oxygen,   etc   ; biochemical pathways; biomineralization; dissolved organic carbon; molecular weight; water quality; water reservoirs; water temperature; China;     Show all 9 Subjects
Abstract:
... Naturally complete mixing promotes the spontaneous redistribution of dissolved oxygen (DO), representing an ideal state for maintaining good water quality, and conducive to the biomineralization of organic matter. Water lifting aerators (WLAs) can extend the periods of complete mixing and increase the initial mixing temperature. To evaluate the influence of artificial-induced continuously mixing o ...
DOI:
10.1016/j.jes.2021.03.024

2. Aerator energy use in shrimp farming and means for improvement

Author:
Boyd, Claude E.; McNevin, Aaron A.
Source:
Journal of the World Aquaculture Society 2021 v.52 no.1 pp. 6-29
ISSN:
0893-8849
Subject:
dissolved oxygen,   etc   ; aeration; biomass; energy; shrimp; Asia;     Show all 6 Subjects
Abstract:
... Estimates of aeration energy use in shrimp farming varied from 11.4 to 41.6 GJ/t shrimp (average = 19.8 GJ/t). Several opportunities for reducing energy use in aeration are available. Many farms adopt an excessive yield to installed aeration capacity ratio. Moreover, the proportion of installed aerator capacity in use and duration of aerator operation per day are often more than necessary during t ...
DOI:
10.1111/jwas.12753

3. Application of an adaptive PID controller enhanced by a differential evolution algorithm for precise control of dissolved oxygen in recirculating aquaculture systems

Author:
Zhou, Xinhui; Li, Daoliang; Zhang, Lu; Duan, Qingling
Source:
Biosystems engineering 2021 v.208 pp. 186-198
ISSN:
1537-5110
Subject:
dissolved oxygen,   etc   ; aeration; air flow; algorithms; surface water;     Show all 5 Subjects
Abstract:
... In aquaculture, the dissolved oxygen (DO) content of a water body is important for the growth of aquatic products and thus needs to be precisely controlled. For this purpose, through an open-loop experiment of DO aeration under different airflow rates, empirical transfer function models that can fully describe the dynamic response relationship between aeration flow rate and DO content were establi ...
DOI:
10.1016/j.biosystemseng.2021.05.019

4. Catalase-conjugated collagen surfaces and their application for the quantification determination of H2O2 in milk

Author:
He, Li; Qian, Wen; Cen, Liyuan; Shen, Siwei; Wang, Shuo; Chen, Shujuan; Liu, Shuliang; Liu, Aiping; Yang, Yong; Liu, Yaowen
Source:
Lebensmittel-Wissenschaft + [i.e. und] Technologie 2021 v.147 pp. 111601
ISSN:
0023-6438
Subject:
dissolved oxygen,   etc   ; biosensors; catalase; collagen; milk; pH; rapid methods;     Show all 7 Subjects
Abstract:
... The detection of H₂O₂ in milk was carried out using a CIC-biosensor based on collagen-immobilized catalase (CIC) and a dissolved oxygen probe. The CIC-biosensor response was fastest at pH 7.0 at 30 °C. Further, the biosensor exhibited responses over a H₂O₂ concentration range from 1.47 × 10⁻⁶ mol/L to 2.94 × 10⁻⁴ mol/L with response times of 20–120 s, and could be reused eight times. When the CIC ...
DOI:
10.1016/j.lwt.2021.111601

5. Model-based analysis of dissolved oxygen supply to aquifers within riparian zones during river level fluctuations: Dynamics and influencing factors

Author:
Bu, Xiaochuang; Dai, Heng; Yuan, Songhu; Zhu, Qi; Li, Xu; Zhu, Yonghui; Li, Yiming; Wen, Zhang
Source:
Journal of hydrology 2021 v.598 pp. 126460
ISSN:
0022-1694
Subject:
dissolved oxygen,   etc   ; air; aquifers; hydraulic conductivity; river water; rivers;     Show all 6 Subjects
Abstract:
... Dissolved oxygen (DO) largely impacts the environmental function of riparian aquifers. However, the dynamics and influencing factors of DO supply to riparian aquifers are not well understood. In this study, we developed a model considering air–liquid two-phase flow, air entrapment and multi-phase transport of O₂(g) in a riparian aquifer to investigate the hydrologic exchange flows and DO supply du ...
DOI:
10.1016/j.jhydrol.2021.126460

6. Insight into how high dissolved oxygen favors the startup of nitritation with aerobic granules

Author:
Wang, Jianfang; Song, Jiajun; Yin, Fangfang; Shen, Yaoliang; Yang, Dianhai; Liu, Wenru
Source:
Chemosphere 2021 v.270 pp. 128643
ISSN:
0045-6535
Subject:
dissolved oxygen,   etc   ; ammonium; nitrification; nitrites; polymers; porosity; sludge;     Show all 7 Subjects
Abstract:
... To elucidate how high dissolved oxygen (DO) favors the startup of nitritation with aerobic granular sludge, two granular reactors were operated under low (1–2 mg O₂·L⁻¹) and high DO (3–5 mg O₂·L⁻¹) conditions with similar effluent ammonium concentrations (>20 mg N·L⁻¹). The results showed that though nitritation with an average nitrite accumulation ratio of above 95% was finally achieved in both r ...
DOI:
10.1016/j.chemosphere.2020.128643

7. Performance evaluation of venturi aeration system

Author:
Yadav, Anamika; Kumar, Avinash; Sarkar, Sudipto
Source:
Aquacultural engineering 2021 v.93 pp. 102156
ISSN:
0144-8609
Subject:
dissolved oxygen,   etc   ; Reynolds number; aeration; air; geometry; oxygen; throat;     Show all 7 Subjects
Abstract:
... The venturi aeration is an effective practice to increase the dissolved oxygen accessibility in the water bodies. This study aims to optimize the various geometrical parameters of the venturi aeration system. A non-dimensional technique was applied to find the optimum performance of various geometric parameters i.e. throat lengths (tₗ), number of air holes (N), and converging and diverging angles ...
DOI:
10.1016/j.aquaeng.2021.102156

8. The influence of a dam reservoir on water quality in a small lowland river

Author:
Dębska, Katarzyna; Rutkowska, Beata; Szulc, Wiesław
Source:
Environmental monitoring and assessment 2021 v.193 no.3 pp. 123
ISSN:
0167-6369
Subject:
dissolved oxygen,   etc   ; chemical oxygen demand; rivers; total phosphorus; water quality;     Show all 5 Subjects
Abstract:
... The paper presents the effects of the dam reservoir in Komorów on the water quality in the Utrata river. The implementation of the adopted objective involved a comparison of water quality at two points, above and below the reservoir. The Utrata River is polluted with biogenic compounds throughout the whole section studied. COD content also indicates significant contamination exceeding permissible ...
DOI:
10.1007/s10661-021-08905-6

9. A New Automatic Monitoring Network of Surface Waters in Greece: Preliminary Data Quality Checks and Visualization

Author:
Panagopoulos, Yiannis; Konstantinidou, Anna; Lazogiannis, Konstantinos; Papadopoulos, Anastasios; Dimitriou, Elias
Source:
Hydrology 2021 v.8 no.1
ISSN:
2306-5338
Subject:
dissolved oxygen,   etc   ; data quality; electrical conductivity; infrastructure; pH; temperature; Greece;     Show all 7 Subjects
Abstract:
... The monitoring of surface waters is of fundamental importance for their preservation under good quantitative and qualitative conditions, as it can facilitate the understanding of the actual status of water and indicate suitable management actions. Taking advantage of the experience gained from the coordination of the national water monitoring program in Greece and the available funding from two on ...
DOI:
10.3390/hydrology8010033

10. Assessment of benthic ecological status in semi-enclosed Daya Bay (China) in regions exposed to human disturbances based on multiple biotic indices

Author:
Li, Yafang; Ning, Jiajia; Wang, Lianggen; Xu, Lei; Li, Chunhou; Du, Feiyan
Source:
Regional studies in marine science 2021 v.41 pp. 101464
ISSN:
2352-4855
Subject:
dissolved oxygen,   etc   ; anthropogenic activities; autumn; nutrients; pollution; species diversity; China;     Show all 7 Subjects
Abstract:
... Daya Bay has been greatly influenced by a variety of human disturbances over the last three decades. Because no extremely useful single biotic index for the assessment of ecological status exists, several biotic indices (the AZTI’s marine biotic index (AMBI), the multivariate AZTI’s marine biotic index (M-AMBI), and the taxonomic diversity (TD) index) were applied to more accurately evaluate the c ...
DOI:
10.1016/j.rsma.2020.101464

11. Fast responses of microbial plankton communities associated to regime shifts in vegetated wetlands (free-floating plants vs phytoplankton-dominance): An experimental cross-transplant approach

Author:
Allende, Luz; Izaguirre, Irina; O’Farrell, Inés; Vera, María Solange; Chaparro, Griselda; Sinistro, Rodrigo; Sánchez, María Laura
Source:
Limnologica 2021 v.86 pp. 125845
ISSN:
0075-9511
Subject:
dissolved oxygen,   etc   ; Oscillatoriales; dialysis; habitats; oxygen; photosynthesis; phytoplankton; vegetation cover;     Show all 8 Subjects
Abstract:
... Vegetated wetlands are naturally subjected to changes in their water-level and macrophyte coverage leading to high habitat heterogeneity. The opportunistic ecological strategy of many planktic algae and bacteria makes them suitable for studying adaptive mechanisms to environmental change in wetlands at different temporal and spatial scales. In this study, we assessed the response of microbial aqua ...
DOI:
10.1016/j.limno.2020.125845

12. Comparative experiments of two novel tubular photobioreactors with an inner aerated tube for microalgal cultivation: Enhanced mass transfer and improved biomass yield

Author:
Cui, Xuyang; Yang, Junhong; Cui, Mianshan; Zhang, Wenwen; Zhao, Jun
Source:
Algal research 2021 v.58 pp. 102364
ISSN:
2211-9264
Subject:
dissolved oxygen,   etc   ; bioenergy; biomass production; carbon dioxide; mass transfer; microalgae; photobioreactors; research;     Show all 8 Subjects
Abstract:
... The efficient cultivation of microalgae plays an important role in CO₂ fixation and the efficient use of bioenergy resources. To enhance mass transfer and improve algal biomass yield, a novel tangent double-tube photobioreactor (TDTP) with an inner aerated tube generating vortices is proposed, which increases the mixing performance to improve the micro-environment in microalgal cultivation with tu ...
DOI:
10.1016/j.algal.2021.102364

13. Enhancing the in-situ enrichment of anammox bacteria in aerobic granules to achieve high-rate CANON at low temperatures

Author:
Liu, Wenru; Wang, Qian; Shen, Yaoliang; Yang, Dianhai
Source:
Chemosphere 2021 v.278 pp. 130395
ISSN:
0045-6535
Subject:
dissolved oxygen,   etc   ; Chloroflexi; ammonium; anaerobic ammonium oxidation; inoculum; nitrites; total nitrogen; wastewater; wastewater treatment;     Show all 9 Subjects
Abstract:
... In this study, a high-rate CANON (Complete Autotrophic Nitrogen-removal Over Nitrite) process was started up successfully by enhancing the in-situ enrichment of anammox bacteria in aerobic granules at conditions relevant for mainstream wastewater treatment. Firstly, to provide nitrite for anammox bacteria growth efficient nitrite-oxidizing bacteria (NOB) repression was rapidly achieved and stably ...
DOI:
10.1016/j.chemosphere.2021.130395

14. Optimal control towards sustainable wastewater treatment plants based on multi-agent reinforcement learning

Author:
Chen, Kehua; Wang, Hongcheng; Valverde-Pérez, Borja; Zhai, Siyuan; Vezzaro, Luca; Wang, Aijie
Source:
Chemosphere 2021 v.279 pp. 130498
ISSN:
0045-6535
Subject:
dissolved oxygen,   etc   ; energy; eutrophication; greenhouse gases; greenhouses; humans; pollution; sludge; wastewater treatment;     Show all 9 Subjects
Abstract:
... Wastewater treatment plants (WWTPs) are designed to eliminate pollutants and alleviate environmental pollution resulting from human activities. However, the construction and operation of WWTPs consume resources, emit greenhouse gases (GHGs) and produce residual sludge, thus require further optimization. WWTPs are complex to control and optimize because of high non-linearity and variation. This stu ...
DOI:
10.1016/j.chemosphere.2021.130498

15. Two transformation pathways of Acetaminophen with Fe3+ saturated clay particles in dark or light

Author:
Tong, Yunping; Wang, Xinghao; Sun, Zhaoyue; Gao, Juan
Source:
Chemosphere 2021 v.278 pp. 130399
ISSN:
0045-6535
Subject:
dissolved oxygen,   etc   ; acetaminophen; clay; irradiation; lighting; mineralization; oligomerization; oxidation; pH; risk;     Show all 10 Subjects
Abstract:
... Acetaminophen (AP) has been frequently detected in different environments due to its wide usage as a common analgesic and antipyretic pharmaceutical. Excess residual of AP in the environment may cause biological risk. However, information about its environmental behaviors was limited, especially the interactions with clay minerals. In this study, AP transformation mediated by Fe³⁺ saturated clay p ...
DOI:
10.1016/j.chemosphere.2021.130399

16. The sequestration of aqueous Cr(VI) by zero valent iron-based materials: From synthesis to practical application

Author:
Fang, Yi; Wu, Xiange; Dai, Min; Lopez-Valdivieso, A.; Raza, Saleem; Ali, Imran; Peng, Changsheng; Li, Juying; Naz, Iffat
Source:
Journal of cleaner production 2021 v.312 pp. 127678
ISSN:
0959-6526
Subject:
dissolved oxygen,   etc   ; adsorption; chromium; coprecipitation; groundwater; iron; markets; pH; pollutants; researchers;     Show all 10 Subjects
Abstract:
... In recent years, zero-valent iron (ZVI) has been extensively employed for the elimination of organic and inorganic contaminants. However, the performance of ZVI was restrained due to the inherent properties in the process of pollutants sequestration like agglomeration, surface passivation, and sensitivity to the pH and dissolved oxygen (DO) in the environment. To combat these issues, ZVI-based mat ...
DOI:
10.1016/j.jclepro.2021.127678

17. Occurrence of unknown reactive species in UV/H2O2 system leading to false interpretation of hydroxyl radical probe reactions

Author:
Kim, Min Sik; Lee, Changha; Kim, Jae-Hong
Source:
Water research 2021 v.201 pp. 117338
ISSN:
0043-1354
Subject:
dissolved oxygen,   etc   ; 4-hydroxybenzoic acid; benzoic acid; hydroxyl radicals; oxidants; oxidation; research; water;     Show all 8 Subjects
Abstract:
... The UV/H₂O₂ process is a benchmark advanced oxidation process (AOP) that in situ generates highly reactive and nonselective hydroxyl radical (•OH) to oxidatively destroy a wide range of organic compounds. Accurately quantifying the concentration of short-lived •OH is essential to predict process performance, optimize the operation parameters, and compare with other process options. The •OH concent ...
DOI:
10.1016/j.watres.2021.117338

18. An integrated migration and transformation model to evaluate the occurrence characteristics and environmental risks of Nitrogen and phosphorus in constructed wetland

Author:
Li, Hongrui; Ma, Xiaodong; Zhou, Bin; Ren, Gengbo; Yuan, Dekui; Liu, Honglei; Wei, Zizhang; Gu, Xiujun; Zhao, Bin; Hu, Yanhua; Wang, Hongguang
Source:
Chemosphere 2021 v.277 pp. 130219
ISSN:
0045-6535
Subject:
dissolved oxygen,   etc   ; absorption; adsorption; constructed wetlands; models; nitrogen; phosphorus; pollution; sediments; water quality; China;     Show all 11 Subjects
Abstract:
... In this study, an integrated migration and transformation (IMT) model based on microbial action, plant absorption, sediment release and substrate adsorption was firstly established to evaluate the temporal-spatial distribution of N and P in Lingang hybrid constructed wetland (CW), Tianjin. Compared to the conventional transformation model that only considers the microbial action, the IMT model cou ...
DOI:
10.1016/j.chemosphere.2021.130219

19. Recent technologies for nutrient removal and recovery from wastewaters: A review

Author:
Hasan, Mohd Najibul; Altaf, Mohd Musheer; Khan, Nadeem A.; Khan, Afzal Husain; Khan, Abid Ali; Ahmed, Sirajuddin; Kumar, P. Senthil; Naushad, Mu.; Rajapaksha, Anushka Upamali; Iqbal, Jibran; Tirth, Vineet; Islam, Saiful
Source:
Chemosphere 2021 v.277 pp. 130328
ISSN:
0045-6535
Subject:
dissolved oxygen,   etc   ; biological treatment; cost effectiveness; eutrophication; nitrogen; phosphorus; sewage; wastewater; water pollution; water shortages;     Show all 10 Subjects
Abstract:
... Water scarcity and its pollution has become a concern in recent times. The disposal of nutrient-rich (nitrogen and phosphorous) wastewater is also one of the main cause of water pollution through eutrophication, reduced dissolved oxygen that poses threat to aquatic ecosystems. As a result, nutrient removal has become a mandate apart from the removal of organics. However, the removal of nutrients f ...
DOI:
10.1016/j.chemosphere.2021.130328

20. Scrap Iron Filings assisted nitrate and phosphate removal in low C/N waters using mixed microbial culture

Author:
Narayanasamydamodaran, Sanjena; Zuo, Jian’e; Ren, Haiteng; Kumar, Nawnit
Source:
Frontiers of environmental science & engineering 2021 v.15 no.4 pp. 66
ISSN:
2095-2201
Subject:
dissolved oxygen,   etc   ; adsorbents; byproducts; denitrification; inoculum; microbial culture; nitrate reduction; nitrates; phosphates;     Show all 9 Subjects
Abstract:
... This study focuses on identifying the factors under which mixed microbial seeds assist bio-chemical denitrification when Scrap Iron Filings (SIF) are used as electron donors and adsorbents in low C/N ratio waters. Batch studies were conducted in abiotic and biotic reactors containing fresh and aged SIF under different dissolved oxygen concentrations with [Formula: see text] and/or PO₄³⁻ influent(s ...
DOI:
10.1007/s11783-020-1358-2