A Critical Review of Methods for Analyzing Freshwater Eutrophication

Zhang, Yan; Li, Mingxuan; Dong, Jiefeng; Yang, Hong; Zwieten, Lukas Van; Lü, Hui; Alshameri, Aref; Zhan, Zihan; Chen, Xin; Jiang, Xueding; Xu, Weicheng; Bao, Yanping; Wang, Hailong

doi:10.3390/w13020225

Cited by 48 publications

(14 citation statements)

References 95 publications

(52 reference statements)

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“…Eutrophication is an enrichment of a relatively closed and slow-flowing water body (such as a river, lake, reservoir, or freshwater wetland) by dissolved nutrients that causes structural changes in the ecosystem, such as stimulation of the proliferation of algae and other plankton in the water, depletion of fish species, the general deterioration of water quality, and other effects that reduce and preclude use [104,105]. All water bodies are subject to natural and slow eutrophication processes, but in recent decades, anthropogenic activities have accelerated the progression and extent of eutrophication in several water bodies [106,107].…”

Section: Eutrophicationmentioning

confidence: 99%

Sub-Saharan Africa Freshwater Fisheries under Climate Change: A Review of Impacts, Adaptation, and Mitigation Measures

Muringai

Mafongoya

Lottering

2022

Fishes

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Sub-Saharan Africa’s freshwater fisheries contribute significantly to the livelihoods and food security of millions of people within the region. However, freshwater fisheries are experiencing multiple anthropogenic stressors such as overfishing, illegal fishing, pollution, and climate change. There is a substantial body of literature on the effects of climate change on freshwater fisheries in Sub-Saharan Africa. This study reviews the existing literature and highlights the effects of climate change on freshwater fisheries, the adaptation strategies of fishery-dependent households in response to the effects, and fisheries’ management and mitigation efforts in the face of climate change. The general effects of climate change on freshwater environments include warming water temperatures, increased stratification, modified hydrological processes, and increased pollutants. These effects adversely affect the physiological processes of fish and the overall wellbeing of fishery-dependent people. To cope with the effects of fluctuating fishery resources due to climate change, fishery-dependent people have adopted several adaptation strategies including livelihood diversification, changing their fishing gear, increasing their fishing efforts, and targeting new species. Several management attempts have been made to enhance the sustainability of fishery resources, from local to regional levels. This study recommends the participation of the resource users in the formulation of policies aimed at promoting climate change adaptation and the resilience of freshwater fisheries for sustainable development.

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Section: Eutrophicationmentioning

confidence: 99%

Sub-Saharan Africa Freshwater Fisheries under Climate Change: A Review of Impacts, Adaptation, and Mitigation Measures

Muringai

Mafongoya

Lottering

2022

Fishes

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“…At present, eutrophication has led to severe problems in open freshwater sources around the world [7]. Phosphate ion concentrations above 0.02 mg L −1 in water reservoirs result in eutrophication [8].…”

Section: Introductionmentioning

confidence: 99%

Fe(III)–Chitosan Microbeads for Adsorptive Removal of Cr(VI) and Phosphate Ions

Tandekar¹,

Pande²,

Shekhawat

et al. 2022

Minerals

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Fe(III)–chitosan microbeads (Fe–CTB) were prepared using a chemical coprecipitation method. SEM–EDX, FTIR, XRD, TGA, BET, and pH pzc were performed for the characterization of the adsorbent. Various parameters were optimized as pH, adsorption time, adsorbent dose, initial Cr(VI), and PO43− ion concentration and the effect of assorted ions for adsorption studies. Fe–CTB microbeads revealed more than 80% detoxification for a 100 mg L−1 initial concentration at pH 3 with 60 min stirring of Cr(VI) and PO43− ion having adsorption capacities of 34.15 and 32.27 mg g−1, respectively. The adsorption process for Cr(VI) and PO43− ion followed the monolayer adsorption as they favored the Langmuir isotherm model. Kinetic and thermodynamic studies’ emphasis on the adsorption process was spontaneous and exothermic with pseudo-second-order kinetics for both adsorbates. The microbeads were found to be reusable in multiple cycles.

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“…Failure to achieve these limits poses an environmental health risk. For example, eutrophication, which can be caused by the above pollutants, is comprehensively documented as a major threat to freshwater ecosystems [10] and is one of the most challenging environmental problems faced in the world today [11].…”

Section: Introductionmentioning

confidence: 99%

Deployment and Optimisation of a Pilot-Scale IASBR System for Treatment of Dairy Processing Wastewater

et al. 2021

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Increased pressure is being applied to industrial wastewater treatment facilities to adhere to more stringent regulations for the discharge of treated wastewater and to improve energy efficiency of the process. Nitrogen and phosphorous removal can be challenging to achieve efficiently, and in the case of phosphorous removal, can often necessitate the use of chemicals. There is a major drive globally to improve wastewater treatment infrastructure, whilst simultaneously reducing the carbon footprint of the process. The intermittently aerated sequencing batch reactor offers a modification of the well-known sequencing batch reactor process that can enable lower energy requirements than conventional sequencing batch reactor processes and can facilitate enhanced nutrient removal capacities. However, to date much of the previous literature has focused on relatively short laboratory-scale trials (often with synthetic wastewater) which may not be representative of larger scale system performance. This study explored the intermittently aerated sequencing batch reactor technology via a case-study deployment at a dairy production facility, in terms of treatment efficiency and energy efficiency with a focus on optimisation between phases. High treatment capacity and operational flexibility was achieved with NH4-N removals averaging >89%, PO4-P removal averaging >90% and total suspended solids removal averaging >97%. This research demonstrates the characteristics of intermittently aerated sequencing batch reactor technology at scale to effectively achieve biological nutrient removal. In addition, this study demonstrated that when effectively managed, energy savings and reductions in carbon emissions in the region of 36–68% are achievable through optimisation of reactor operation.

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A Critical Review of Methods for Analyzing Freshwater Eutrophication

Cited by 48 publications

References 95 publications

Sub-Saharan Africa Freshwater Fisheries under Climate Change: A Review of Impacts, Adaptation, and Mitigation Measures

Sub-Saharan Africa Freshwater Fisheries under Climate Change: A Review of Impacts, Adaptation, and Mitigation Measures

Fe(III)–Chitosan Microbeads for Adsorptive Removal of Cr(VI) and Phosphate Ions

Deployment and Optimisation of a Pilot-Scale IASBR System for Treatment of Dairy Processing Wastewater

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