Searched for: subject:"nutrients"
(1 - 20 of 42)

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Ross, P.S. (author), van der Aa, L.T.J. (author), van Dijk, T. (author), Rietveld, L.C. (author)
Biological activated carbon (BAC) filtration is an important treatment step in the production of drinking water especially if drinking water is produced from surface water. The performance and processes within a BAC filter have been of interest for researchers since the 1980's, mainly because of its ability to remove natural organic matter...
journal article 2019
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Yu, Liang (author), Rozemeijer, Joachim (author), Van Der Velde, Ype (author), van Breukelen, B.M. (author), Ouboter, Maarten (author), Broers, Hans Peter (author)
Urban areas in coastal lowlands host a significant part of the world's population. In these areas, cities have often expanded to unfavorable locations that have to be drained or where excess rain water and groundwater need to be pumped away in order to maintain dry feet for its citizens. As a result, groundwater seepage influences surface...
journal article 2019
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Dijkstra, Y.M. (author), Chant, Robert J. (author), Reinfelder, John R. (author)
Phytoplankton biomass in estuaries is controlled by complex biological and chemical processes that control growth and mortality, and physical processes that control transport and dilution. The effects of these processes on phytoplankton blooms were systematically analyzed, focusing on identifying the dominant controlling factors out of river...
journal article 2019
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Graversgaard, Morten (author), Hedelin, Beatrice (author), Smith, Laurence (author), Gertz, Flemming (author), Højberg, Anker Lajer (author), Langford, John (author), Martinez, Grit (author), Mostert, E. (author), Ptak, Emilia (author), Peterson, Heidi (author), Stelljes, Nico (author), van Den Brink, Cors (author), Refsgaard, Jens Christian (author)
Diffuse Water Pollution from Agriculture (DWPA) and its governance has received increased attention as a policy concern across the globe. Mitigation of DWPA is a complex problem that requires a mix of policy instruments and a multi-agency, broad societal response. In this paper, opportunities and barriers for developing co-governance, defined...
journal article 2018
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Izett, J.G. (author), Fennel, Katja (author)
Rivers deliver large amounts of terrestrially derived materials (such as nutrients, sediments, and pollutants) to the coastal ocean, but a global quantification of the fate of this delivery is lacking. Nutrients can accumulate on shelves, potentially driving high levels of primary production with negative consequences like hypoxia, or be...
journal article 2018
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Izett, J.G. (author), Fennel, Katja (author)
Rivers deliver large amounts of fresh water, nutrients, and other terrestrially derived materials to the coastal ocean. Where inputs accumulate on the shelf, harmful effects such as hypoxia and eutrophication can result. In contrast, where export to the open ocean is efficient riverine inputs contribute to global biogeochemical budgets....
journal article 2018
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Hendriks, A.T.W.M. (author), van Lier, J.B. (author), de Kreuk, M.K. (author)
Fermentation and anaerobic digestion of organic waste and wastewater is broadly studied and applied. Despite widely available results and data for these processes, comparison of the generated results in literature is difficult. Not only due to the used variety of process conditions, but also because of the many different growth media that are...
journal article 2018
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Rubio-Rincón, Francisco (author), Lopez-Vazquez, Carlos (author), Welles, L. (author), van den Brand, Tessa (author), Abbas, B.A. (author), van Loosdrecht, Mark C.M. (author), Brdanovic, Damir (author)
The concentration of sulphate present in wastewater can vary from 10 to 500 mg SO<sub>4</sub> <sup>2−</sup>/L. During anaerobic conditions, sulphate is reduced to sulphide by sulphate-reducing bacteria (SRB). Sulphide generation is undesired in wastewater treatment plants (WWTPs). Previous research indicated that SRB are inhibited by the...
journal article 2017
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Mollema, P.N. (author)
Gravel pit lakes form when gravel is excavated from below the water table of a phreatic or shallow confined aquifer. Typically many of these lakes are concentrated along naturally occurring sedimentary gravel deposits in areas where gravel is needed for construction. Most gravel pit lakes are relatively young features: most are less than 50...
doctoral thesis 2016
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Nyenje, P. (author)
This study investigates the generation, transport and fate of sanitation-related nutrients in groundwater and surface water in an urban slum area in sub-Saharan Africa. In excess, nutrients can cause eutrophication of downstream water bodies. The study argues that nitrogen-containing rains and domestic wastewater from slum areas were important...
doctoral thesis 2014
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Bassin, J.P. (author)
The removal of nutrients such as nitrogen and phosphorus from both domestic and industrial wastewaters is imperative since they potentially harm the environment. One of the main consequences of excessive availability of nitrogen and phosphorus in aquatic ecosystems (freshwater, marine and estuarine) is the overgrowth of algae and other aquatic...
doctoral thesis 2012
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Silva, A.F. (author), Carvalho, G. (author), Oehmen, A. (author), Lousada-Ferreira, M. (author), Van Nieuwenhuijzen, A. (author), Reis, M.A.M. (author), Crespo, M.T.B. (author)
Membrane bioreactors (MBR) are an important and increasingly implemented wastewater treatment technology, which are operated at low food to microorganism ratios (F/M) and retain slow-growing organisms. Enhanced biological phosphorus removal (EBPR)-related organisms grow slower than ordinary heterotrophs, but have never been studied in detail in...
journal article 2012
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Azab, A.M. (author)
The intensive uses of limited water resources, the growing population rates and the various increasing human activities put high and continuous stresses on these resources. Major problems affecting the water quality of rivers, streams and lakes may arise from inadequately treated sewage, poor land use practices, inadequate controls on the...
doctoral thesis 2012
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Basu, N.B. (author), Destouni, G. (author), Jawitz, J.W. (author), Thompson, S.E. (author), Loukinova, N.V. (author), Darracq, A. (author), Zanardo, S. (author), Yaeger, M. (author), Sivapalan, M. (author), Rinaldo, A. (author), Rao, S.P.C. (author)
Complexity of heterogeneous catchments poses challenges in predicting biogeochemical responses to human alterations and stochastic hydro?climatic drivers. Human interferences and climate change may have contributed to the demise of hydrologic stationarity, but our synthesis of a large body of observational data suggests that anthropogenic...
journal article 2010
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Ravazzini, A.M. (author)
In the usual wastewater treatment schemes the application of membranes follows a biological process. However, ultrafiltration of untreated wastewater produces permeate free of particles and bacteria in one single step and could represent the starting point for new water-reuse concepts. This thesis focuses on crossflow ultrafiltration of raw...
doctoral thesis 2008
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Van Vliet, M.T.H. (author)
report 2006
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De Kreuk, M.K. (author)
Most conventional wastewater treatment plants need a large surface area for the treatment of their sewage. This is due to the open structure of the biomass used to convert the polluting components in wastewater. Because of the flocculated growth, sludge concentrations in reaction tanks are low and settling times need to be long in order to keep...
doctoral thesis 2006
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Wilsenach, J.A. (author)
Abstract not available
doctoral thesis 2006
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Laane, R.W.P.M. (author)
This report aims to identify the origins of the past changes in the eutrophication status of the Wadden Sea. Special attention is given to changes in light regime, nutrient elimination and retention, which may have resulted from human interventions along the Dutch coast. Starting point for the assessment is that model calculations expect that 10...
report 2005
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Blauw, A.N. (author), Los, F.J. (author)
report 2004
Searched for: subject:"nutrients"
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