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Introduction Cultural eutrophication (excessive plant growth resulting from nutrient enrichment by human activity) is the primary problem facing most surface waters today (Rast and Thornton 2009 ). Eutrophication has many

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Conception of eutrophication and eutrophic The purpose of this study is to, through a comprehensive bibliometric analysis, provide better knowledge of the status and trends of scientific exploration on eutrophication with a

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413 427 Bollens, U., S. Güsewell and F. Klötzli. 2001. Vegetation changes in two Swiss fens affected by eutrophication and desiccation. Bot. Helv. 111: 121

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eutrophication published in Science Citation Index” by Yi and Jie ( 2011 ) may have committed such error, and is an example of an inadequate, careless construed filter may mislead readers. In the section of Materials and methods, the authors used only

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The paper analyzed the changes of beetle assemblages in the litter layer of eutrophic pine forests in the zone polluted by a nitrogen fertilizer plant Joint Stock Company “Achema” (Lithuania). We hypothesized that abundance, diversity and life traits of beetle assemblages depend on the distance from the pollution source. The samples of the litter layer were taken from pine stands at the distances of 3, 5, 10 and 20 km from the plant. The PCA and GLM analyses were used to reduce the number of variables to the main environmental gradient and assess the influence of environmental factors on beetle abundance, number of species, and life traits. The dependence of species number, abundance and the presence of forest and dendrophagous species on the distance from the plant was detected. A significant impact of organic carbon content, nitrogen emission and moss cover on other life traits of beetles was disclosed. The abundance of moss fraction in the litter layer was positively correlated with increasing distance from the plant. The ability to tolerate polluted sites by three species: Atheta fungi, Micrambe abietis and Brassicogethes aeneus, and intolerance of pollution by eight species: Bryaxis puncticollis, Quedius limbatus, Cyphon pubescens, Cephenium majus, Cyphon padi, Cyphon variabilis, Gabrius appendiculatus and Philonthus cognatus, were detected by IndVal analysis. The distribution of litter species was affected by the distance from the plant and by the richness of moss cover.

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. Leira , M. , Chen , G. , Dalton , C. Irvine , K. and Taylor , D. 2009 . Patterns in freshwater diatom taxonomic distinctness along an eutrophication gradient . Freshwater Biol. 54 : 1 – 14

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) demonstrated that freshwater ecosystems may well be the most endangered ecosystems in the world. What's more, eutrophication is a widespread problem in rivers, lakes, estuaries, and coastal oceans, caused by over-enrichment with P and N (Carpenter et al. 1998

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. ( 2012 ) The rise of harmful cyanobacteria blooms: The potential roles of eutrophication and climate change . Harmful Algae 14 , 313 – 334 . 25. Padisák , J. , Reynolds

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Abstract  

Availability of phosphorus from the bottom sediments of a lake plays an import role in the development of aquatic biota and in the enhancement of the eutrophication process. In this work, the31P–32P isotopic exhange (E values) technique was applied to assess the potential influence of this phosphorus reservoir on the water quality of the Acaray and Yguazú Dams in the Easter Region of Paraguay. Samples analyzed were taken from the bottom sediments of the water body at different sites as well as from the shores. The method is reliable and yields information of potential ecological significance.

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Nutrient removal has become one of the key challenges for wastewater treatment facilities all over the world due to the harmful effect of these pollutants on water bodies and ecosystems known by eutrophication, however, most of the currently used technologies are not focused on nutrients recovery from wastewater. Recently, using agricultural waste/by-products for adsorption of nutrients acquired more interest because of their abundant availability, low-cost, high efficiency and eco-friendly advantages and this method may become more environmentally sustainable through maximizing removal while delivering nutrient and energy recovery technologies with economically attractive return on investment.

This review investigates the application of agricultural waste/by-products as bio-sorbent for phosphate, ammonium and nitrate removal with a focus on the modification methods and the process mechanism including influent parameters, kinetics and isotherms.

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