scholarly journals Mitigating eutrophication nuisance: in-lake measures are becoming inevitable in eutrophic waters in the Netherlands

Hydrobiologia ◽  
2020 ◽  
Vol 847 (21) ◽  
pp. 4447-4467 ◽  
Author(s):  
Miquel Lürling ◽  
Maíra Mucci
Keyword(s):  
The Netherlands ◽  
Grey Literature ◽  
Cyanobacterial Blooms ◽  
Fish Introduction ◽  
Small Surface ◽  
Air Bubble ◽  
Phosphorus Inactivation ◽  
Proper Diagnosis ◽  
Micro Organisms ◽  
Critical Overview

AbstractIn the Netherlands, legacies and diffuse nutrient pollution continue to fuel recurrent cyanobacterial blooms in mostly shallow and relatively small surface waters. A survey in peer-reviewed literature and Dutch grey-literature was performed to gain insight into the physical-, chemical- and biological in-lake interventions used to bring these waters towards their desired state. A critical overview is presented on efficacy of different measures to counteract cyanobacterial blooms directly via targeting the cyanobacteria or indirectly via reduction of nutrient availability. Many actions have no or limited effects on minimising cyanobacterial blooms (air-bubble- or oil screens, surface mixers, low-energy ultrasound, effective micro-organisms, fish introduction), while others are more effective, but may vary in longevity and costs (dams, excavation or dredging, hydrogen peroxide, phosphorus inactivation agents), meet legislation restrictions (copper-based algaecides, herbicides, dreissenids), or are not currently implemented (hypolimnetic withdrawal). The selection of promising interventions requires a proper diagnosis of each problem lake, based on water- and nutrient fluxes, the biology of the lake (plants, fish), the function of the lake and the characteristics of the method, such as efficacy, costs, safety and ease of implementation. In the Netherlands, ongoing diffuse loads and legacies necessitate repetitive in-lake interventions.

Storage reservoirs – a first barrier for pathogenic micro-organisms in the Netherlands

1998 ◽  
Vol 37 (2) ◽  
pp. 253-260 ◽  
Author(s):  
Lambert W. C. A. van Breemen ◽  
Henk A. M. Ketelaars ◽  
Wim Hoogenboezem ◽  
Gertjan Medema
Keyword(s):  
Drinking Water ◽  
The Netherlands ◽  
Agricultural Waste ◽  
Quality Criteria ◽  
River Rhine ◽  
Total Production ◽  
River Meuse ◽  
Storage Reservoirs ◽  
Microbiological Water Quality ◽  
Micro Organisms

Production of drinking water from river water, abstracted either directly from river or from storage reservoirs, requires the application of barriers for pathogenic micro-organisms. About one third of the total production of drinking water in the Netherlands is derived from surface water, mainly the River Meuse and branches of the River Rhine. The results of extensive monitoring programmes show that the microbiological water quality of the River Rhine and River Meuse is strongly influenced by domestic and agricultural waste water discharges, with respect to the River Meuse mainly in the Liège-region in Belgium. Densities of Cryptosporidium and Giardia in both rivers are comparable; the highest density was found in the Belgian Meuse basin. Elimination rates of 1.7- to 3.1 10log-units for pathogenic micro-organisms were found in Dutch storage reservoirs, which can thus be considered as an important first barrier for pathogenic microorganisms. The elimination capacity of reservoirs is influenced by retention time and contamination by waterfowl. To meet the proposed quality criteria for pathogens in drinking water, however, additional barriers are required.

scholarly journals Removal of Positively Buoyant Planktothrix rubescens in Lake Restoration

Toxins ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 700 ◽  
Author(s):  
Miquel Lürling ◽  
Maíra Mucci ◽  
Guido Waajen
Keyword(s):  
Hydrogen Peroxide ◽  
The Netherlands ◽  
Chlorophyll A ◽  
Lake Restoration ◽  
Low Dose ◽  
Cyanobacterial Blooms ◽  
Similar Species ◽  
Modified Bentonite ◽  
Planktothrix Rubescens ◽  
Polyaluminium Chloride

The combination of a low-dose coagulant (polyaluminium chloride—‘Floc’) and a ballast able to bind phosphate (lanthanum modified bentonite, LMB—‘Sink/Lock’) have been used successfully to manage cyanobacterial blooms and eutrophication. In a recent ‘Floc and Lock’ intervention in Lake de Kuil (the Netherlands), cyanobacterial chlorophyll-a was reduced by 90% but, surprisingly, after one week elevated cyanobacterial concentrations were observed again that faded away during following weeks. Hence, to better understand why and how to avoid an increase in cyanobacterial concentration, experiments with collected cyanobacteria from Lakes De Kuil and Rauwbraken were performed. We showed that the Planktothrix rubescens from Lake de Kuil could initially be precipitated using a coagulant and ballast but, after one day, most of the filaments resurfaced again, even using a higher ballast dose. By contrast, the P. rubescens from Lake Rauwbraken remained precipitated after the Floc and Sink/Lock treatment. We highlight the need to test selected measures for each lake as the same technique with similar species (P. rubescens) yielded different results. Moreover, we show that damaging the cells first with hydrogen peroxide before adding the coagulant and ballast (a ‘Kill, Floc and Lock/Sink’ approach) could be promising to keep P. rubescens precipitated.

The Coverage by National Libraries of National Imprints: A Study in the Netherlands

1997 ◽  
Vol 9 (2) ◽  
pp. 155-166 ◽  
Author(s):  
Henk Voorbij ◽  
Pieter Douma
Keyword(s):  
The Netherlands ◽  
Selection Criteria ◽  
Grey Literature ◽  
Daily Practice ◽  
Necessary Condition ◽  
Legal Basis ◽  
Comprehensive Overview ◽  
High Coverage ◽  
Academic Publications ◽  
National Libraries

Many countries have deposit collections, which aim to be comprehensive for national imprints. It is desirable to find out how far they attain this aim. The deposit collection of the Koninklijke Bibliotheek in the Netherlands, unlike most countries, has no legal basis; publishers send voluntarily one copy of each publication. A study was conducted in 1995/1996 to assess its coverage, focusing on books with ISBNs, academic publications (dissertations etc.), grey literature and periodicals. For each of these categories, samples were taken from sources that offered a complete or the most comprehensive overview of Dutch imprints. Titles that did not meet the selection criteria of the library and titles that had not actually been published were removed from the samples, and the remaining titles were sought in the catalogue of the deposit collection to determine whether they were held, on order, or neither. The findings of the study indicate that coverage is not only good but has improved since the previous study in 1983. They also suggest that a legal basis for deposit is not a necessary condition for high coverage, although such a basis is currently being sought in the Netherlands. In the future, improvements in coverage can be made by applying some of the sources used for the study to daily practice. Other countries planning to embark upon a similar project may be able to use the experience gained.

scholarly journals Determinants of (non-)attendance at the Dutch cancer screening programmes: A systematic review

2019 ◽  
Vol 27 (3) ◽  
pp. 121-129
Author(s):  
Thomas HG Bongaerts ◽  
Frederike L Büchner ◽  
Barend JC Middelkoop ◽  
Onno R Guicherit ◽  
Mattijs E Numans
Keyword(s):  
Cancer Screening ◽  
The Netherlands ◽  
Current Knowledge ◽  
Economic Status ◽  
Grey Literature ◽  
Effective Rate ◽  
Cochrane Library ◽  
Depth Information ◽  
Change Model ◽  
Screening Attendance

Objective The Netherlands host three population-based cancer screening programmes: for cervical, breast, and colorectal cancer. For screening programmes to be effective, high participation rates are essential, but participation in the Netherlands’ programmes is starting to fall below the minimal effective rate. We aimed to produce a systematic overview of the current known determinants of (non-)attendance at the Dutch cancer screening programmes. Methods A literature search was conducted in the electronic databases Academic Search Premier, Cochrane Library, Embase, EMCare, PubMed, PsycINFO, Web of Science, and also in grey literature, including all articles published before February 2018. The I-Change model was used to categorize the identified determinants of cancer screening attendance. Results In total, 19/1232 identified studies and 6 grey literature reports were included. Fifteen studies reported on predisposing factors. Characteristics such as social economic status, country of birth, and residency were most often reported, and correlate with cancer screening attendance. Thirteen studies addressed information factors. Factors on awareness, motivation, ability, and barriers were less often studied. Conclusion Current studies tend to describe the general characteristics of (non-)attendance and (non-)attenders, but rarely provide in depth information on other factors of (non-)participation. The I-Change model proved to be a useful tool in mapping current knowledge on cancer screening attendance and revealed knowledge gaps regarding determinants of (non-)participation in the screening programmes. More research is needed to fully understand determinants of participation, in order to influence and optimize attendance rates over the long term.

scholarly journals The Effects of Limiting Restoration Treatments in a Shallow Urban Lake

Water ◽  
2020 ◽  
Vol 12 (5) ◽  
pp. 1383
Author(s):  
Katarzyna Kowalczewska-Madura ◽  
Joanna Rosińska ◽  
Renata Dondajewska-Pielka ◽  
Ryszard Gołdyn ◽  
Lech Kaczmarek
Keyword(s):  
Water Quality ◽  
Chlorophyll A ◽  
Municipal Wastewater ◽  
Cyanobacterial Blooms ◽  
Urban Lake ◽  
Low Oxygen ◽  
Gradual Improvement ◽  
Chlorophyll A Concentration ◽  
Phosphorus Inactivation ◽  
Bottom Zone

Swarzędzkie Lake, directly polluted for many years with municipal wastewater and heavily loaded with nutrient compounds from the catchment area, has become degraded and strongly eutrophicated. Strong cyanobacterial blooms have contributed, among others, to the cessation of recreational use of this urban lake. Its sustainable restoration was started in autumn 2011. These treatments were a combination of three complementary methods: aeration with a pulverizing aerator, phosphorus inactivation with small doses of magnesium chloride and iron sulphate (<15 kg ha−1) and biomanipulation. These treatments were carried out for three years (2012–2014), and in the next two (2015–2016), treatments were limited from three to one method—aeration. The obtained effects (a decrease in the number of cyanobacteria in phytoplankton and at the same time an increase in its biodiversity, decrease in chlorophyll a concentration and improvement of transparency) were lost due to the cessation of phosphorus inactivation and biomanipulation. The biological balance was upset, which resulted in an increase in chlorophyll a concentration, the return of cyanobacteria dominance in the phytoplankton and a deterioration of water quality. Leaving only a pulverizing aerator active, to maintain low oxygen concentrations near the bottom zone was not sufficient to ensure a gradual improvement of water quality with quite a significant external load of nutrients.

Synopsis publishing for improving the accessibility of 'grey' scholarly information

1985 ◽  
Vol 11 (3) ◽  
pp. 95-107 ◽  
Author(s):  
Dirk G. van der Heij
Keyword(s):  
The Netherlands ◽  
Scientific Literature ◽  
Grey Literature ◽  
Early Discontinuation ◽  
Scholarly Literature ◽  
Docu Ments ◽  
Bibliographic Information ◽  
Early Results ◽  
The Future ◽  
Economic Constraints

In the 1970s, synopsis publishing was one of the topics raised in discussions on the future of primary communication. Tradi tional publishing practices were widely felt to be inefficient for users and producers alike. Since economic constraints were the main incentive for most synopsis publishing experiments, inter est in this idea faded away when journal publishers no longer felt that their journals' future was jeopardized, though author resistance was the main cause of the early discontinuation of many of these experiments. In this paper a plea is made for the virtues of synopsis publishing, not only as an economic necess ity but also for fundamental reasons, for the possibility it gives to separate physically the access, dissemination and archival functions of primary journals. Several attempts have been, and are being, made to improve the accessibility and availability of 'grey' scholarly literature, a large proportion of the world's scientific literature. Thus paper discusses some of these attempts and suggests that the dissemi nation function could be improved by bridging the gap between the bibliographic information in databases and the full docu ments in depositories. Most experiments in synopsis publishing so far have been based on full papers used as back-up for the synopses; the full papers were either published in mini- or microform, or made available on request. Grey literature as back-up to synopses has hardly been discussed in the literature, and the only standard on synopsis publishing issued so far treats this possibility only in an aside. This paper discusses the applicability of the synop sis publishing principle to grey reports and concludes that such ventures are likely to meet less disapproval and resistance from authors and other parties involved than are article-based sys tems. In 1984, Pudoc established the Netherlands Agricultural Report Depository (NARD), a venture in synopsis publishing based on Dutch unpublished reports in agriculture and (ap plied) biology. NARD's approach, procedures and early results are briefly discussed.

scholarly journals Environmental growth of the faecal indicator Enterococcus moraviensis

2016 ◽  
Vol 16 (4) ◽  
pp. 971-979
Author(s):  
Maja Taučer-Kapteijn ◽  
Wim Hoogenboezem ◽  
Gertjan Medema
Keyword(s):  
Drinking Water ◽  
The Netherlands ◽  
Plant Extracts ◽  
Environmental Conditions ◽  
Sand Dunes ◽  
Enterococcus Species ◽  
Dune Vegetation ◽  
Micro Organisms ◽  
Isolated Species

Soil passage through sand dunes has previously been shown to remove enteric micro-organisms very effectively, and hence is used for the production of drinking water. However, enterococci have occasionally been isolated from abstracted water (after dune passage) in one of the dune infiltration areas in the Netherlands. Enterococcus moraviensis was the most frequently isolated species. Until now, no faecal sources of this species have been reported and the potential for growth under certain environmental conditions was reported for other Enterococcus species. The aim of this study was to determine the ability of E. moraviensis to grow in habitats present in the dune passage process (dune vegetation, sediment from abstraction wells, biofilm developed using abstracted water and soil). Different concentrations of boiled and filtered (0.45 μm) plant extracts obtained from dune vegetation supported growth (up to 6 log), with maximum concentrations after 4 to 6 days at 15 °C. Although E. moraviensis was shown to be able to attach to the biofilm, no growth was observed in biofilm or in sediment and soil. These observations confound the use of E. moraviensis as a faecal indicator.

scholarly journals Controlling Eutrophication via Surface Aerators in Irregular-Shaped Urban Ponds

Water ◽  
2021 ◽  
Vol 13 (23) ◽  
pp. 3360
Author(s):  
Aimin Hao ◽  
Sohei Kobayashi ◽  
Dong Xia ◽  
Qi Mi ◽  
Ning Yan ◽  
...  
Keyword(s):  
Water Quality ◽  
Trophic State ◽  
Algal Growth ◽  
Phosphorus Release ◽  
Cyanobacterial Blooms ◽  
Dramatic Improvement ◽  
Small Surface ◽  
Chl A ◽  
The North ◽  
Urban Ponds

Surface aerators have often been introduced in urban ponds for esthetics, but their roles in remediating water quality are less understood. Effects of surface aerators on controlling eutrophication were examined in two urban ponds, in which anaerobic odors and cyanobacterial blooms had occurred and several aerators had been installed. In one of the ponds, a dramatic improvement in dissolved oxygen (DO) (from 1.8 to 8.1 mg L−1) and total phosphorus (TP) (from 1.6 to 0.4 mg L−1) was evident based on the comparison before and after the aeration. Although cyano-bloom did not occur, phytoplankton was dominated by cyanobacteria Microcystis species in both periods. Chlorophyll a (Chl-a) increased (from 29 to 51 μg L−1) and water transparency decreased (from 81 to 27 cm) after the aeration. In the other pond with an irregular shape, water quality was monitored two years after the installation to examine seasonal variation in trophic state and its spatial variation associated with aerator distribution. The water was mixed vertically well for the whole pond, as indicated by small surface-to-bottom differences in temperature. DO decreased in summer after rainfall but was always >5.7 mg L−1. Total nitrogen (TN) and TP were 0.8–2.3 and 0.03–0.07 mg L−1, respectively, and no cyano-blooms were observed across sites throughout the year. Phytoplankton was dominated by green algae and diatom species, which may be favored by the lower phosphorus level of the pond. Chl-a was higher and transparency was lower in the north side, which had more aerators and less shade from trees and buildings. These results suggest that surface aerators increased DO by vertical and horizontal mixing of water, reduced phosphorus release from sediment, and prevented cyano-bloom occurrence, but they did not improve Chl-a level and transparency. Rather, aeration can promote algal growth, and thus, additional purifying measures such as filtration and contact oxidation are required to further improve the trophic state of these ponds.

scholarly journals Coverage of Print Monographs at the Swiss National Library: A Preliminary Study

Libri ◽  
2014 ◽  
Vol 64 (2) ◽  
Author(s):  
Patrice Landry
Keyword(s):  
The Netherlands ◽  
Random Sample ◽  
Grey Literature ◽  
Pilot Project ◽  
High Rate ◽  
Search Query ◽  
National Library ◽  
Preliminary Study ◽  
Set Up

AbstractThis paper reports on the study conducted by the Swiss National Library (NL) in 2012 on its coverage of the acquisition of printed monographs published in Switzerland in 2010. Since the NL had never conducted a study of its acquisition coverage, a pilot project was set up to evaluate list checking techniques that would be the most appropriate in the context of the bibliographic tools available in Switzerland. After considering the methods proposed in ISO/TR 28118:2009, the study tested the list checking method developed at the Koninklijke Bibliotheek (KB) in the Netherlands to evaluate the results of the list produced by Swissbib, the Swiss union catalogue. The study found that the rate of coverage for commercial publications (with an ISBN) was 97.05% and that of grey literature (without an ISBN) was 93.96%. These results are discussed in the context of an analysis of a random sample of the Swissbib list which resulted in a high rate of rejection of records. It found that the search query used did not appropriately and efficiently select records that corresponded to the collection criteria of the NL. The relevance of valid records used in the study to establish the rate of coverage is discussed and arguments are put forward to support the validity of the results. The methodological findings of the pilot project will be integrated in the planning of an official study to be conducted later in 2014.

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