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.

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.

Copper corrosion control in the Netherlands

2001 ◽  
Vol 1 (3) ◽  
pp. 75-82 ◽  
Author(s):  
P.G.G. Slaats ◽  
H. Brink ◽  
T.J.J. van der Hoven
Keyword(s):  
Drinking Water ◽  
The Netherlands ◽  
Treatment Techniques ◽  
Copper Pipe ◽  
Copper Release ◽  
Average Intake ◽  
Split Treatment ◽  
New Treatment ◽  
Monitoring Protocols ◽  
Copper Solubility

Copper is the most commonly used material for pipes in domestic installations in the Netherlands. Depending on the composition of the water the copper pipes can add a significant amount of copper to drinking water. In the new European Drinking Water Directive (98/83/EC) the parametric value for copper in drinking water is decreased from 3 to 2 mg/l. The new directive also stipulates that copper levels should be determined on the basis of a sample ‘taken at the consumers' tap’ representative of the weekly average intake by humans. Harmonisation of monitoring protocols for copper in the European member states is necessary. In the Netherlands about 45% of the drinking water is already softened or de-acidified in order to decrease copper concentrations in drinking water. In the Netherlands two new treatment techniques have been studied for their impact on copper release; these are Reverse Osmosis (RO) and the addition of inhibitors. Copper pipe rig tests have shown that RO treatment decreases copper release. Split treatment of water with RO reduces copper solubility of drinking water through a decrease in both total inorganic carbon (TIC) and sulphate level. Remarkable was the relatively small decrease in copper release after split treatment with RO, compared to previous experiences in the Netherlands, suggesting an effect of natural organic matter. A new promising technique in the Netherlands is the addition of the inhibitor carbonate-activated silicate. At the test sites, the reduction in copper solubility due to the use of carbonate-activated silicate was 15 to 35%.

De watervoorziening op de zandgronden

2019 ◽  
Vol 4 (2) ◽  
pp. 74-88
Author(s):  
BERT GROENEWOUDT
Keyword(s):  
Drinking Water ◽  
The Netherlands ◽  
Water Supply ◽  
Rural Areas ◽  
Functional Differentiation ◽  
16Th Century ◽  
14Th Century ◽  
Local Topography ◽  
Spatio Temporal ◽  
Settlement Landscape

Water supply in the sandy dry lands (the Netherlands). Spatio-temporal developments Wells as water facilities were standard elements of the Dutch settlement landscape only since the Roman period. At the same time (drinking) water facilities became largely detached from the local topography. The position of a well within a settlement became determined by that of its associated house, and its position relative to the house became more or less fixed. This reflects the functional and social subdivision of the farmhouse into two distinct sections: ‘front’ and ‘back’. Communal water facilities (socially important as well) seem to have been associated with nucleated settlement, and they always existed alongside private facilities. Communal (public) wells first appeared in towns around the 13th or 14th century, but in rural areas probably not until the 16th century. In different periods there is evidence for the expression of social and functional differentiation.

Isolation, Detection and Estimation of Various Amylase Producing Bacteria in Various Soil Samples

2021 ◽  
Vol 08 ◽  
Author(s):  
Mohd Amin Mir ◽  
Mohammad Waqar Ashraf ◽  
Altaf Hussain ◽  
Bilal Ahmad Mir
Keyword(s):  
Plant Extracts ◽  
Soil Samples ◽  
Bacillus Sp ◽  
Bacterial Strains ◽  
Cholesterol Levels ◽  
Microbiological Methods ◽  
Ethanolic Extracts ◽  
Microbial Strains ◽  
Litmus Test ◽  
Micro Organisms

Background: Soil is an ultimate source of all types of nutrients, which have both biological and non-biological importance. Studies are being carried out to isolate various types of micro-organisms from soil which have much more importance. So in the present study, amylase producing bacteria have been isolated from various soil samples. Aim: The isolation, identification, and estimation of various microbial strains for α-amylase enzyme production and then the inhibition of the growth of these microbial stains. Methods: The bacterial strains were isolated and then identified by various microbiological methods, including Gram’s staining method followed by several biochemical methods such as, litmus test, Gelatin test and Urea agar media and by viable cells. Results: Altogether, three microbial strains were identified from the soil samples in the concerned study. The concerned strains include- Shigella, Proteus and Bacillus, respectively. The concerned microbial strains were then analyzed for the amount of amylase enzyme and it had been found that Bacillus sp produces much more amount of amylase followed by Shigella sp, and lesser amylase enzyme producing activity was found in Proteus sp. The isolated bacteria were then analysed for inhibition of their growth by water and ethanolic extracts of Cuminum cyminuni. Among the extracts, it had been found that water extracts exhibited more inhibiting capacity than the ethanolic extracts. The study also revealed that among the bacterial strains, the Shigella sp got much more affected by the concerned plant extracts followed by Proteus sp and least inhibition was observed against the Bacillus sp. Conclusion: As per the above study, it is being concluded that - three amylase producing bacteria viz Shigella, proteus, bacillus sp were isolated from the soil samples. These isolated microbial strains could be used for the decomposition of cholesterol levels in human in addition to other microbial activity. These isolated bacterial could sometimes be averse therefore their growth could be stopped by various biological and chemical substances like Gentamicin and by various Plant extracts viz, Cuminum cyminuni Plant.

scholarly journals Exploring the regulatory challenges of a possible rollout of smart water meters in the Netherlands

2018 ◽  
Vol 19 (3-4) ◽  
pp. 159-179
Author(s):  
Brenda Espinosa Apráez ◽  
Saskia Lavrijssen
Keyword(s):  
Drinking Water ◽  
Big Data ◽  
The Netherlands ◽  
Goods And Services ◽  
Smart Water ◽  
Water Meters ◽  
Regulatory Challenges

Big data have become a driver of innovation in multiple sectors, including the management of infrastructures employed for the provision of essential goods and services, such as drinking water. As technology enables new possibilities of action for infrastructure managers, it could be questioned whether the regulations in place still deal adequately with such possibilities or if certain adjustments are necessary, especially considering that infrastructure managers usually operate in highly regulated environments. This study explores the regulatory challenges of introducing smart water meters (SWM) in the Netherlands. In particular, it discusses whether the introduction of SWM will require adjusting the regulations of the sector, to deal with the new possibilities of action enabled by this technology.

scholarly journals How current risk assessment and risk management methods for drinking water in The Netherlands cover the WHO water safety plan approach

2019 ◽  
Vol 222 (7) ◽  
pp. 1030-1037 ◽  
Author(s):  
H.H.J.L. van den Berg ◽  
L. Friederichs ◽  
J.F.M. Versteegh ◽  
P.W.M.H. Smeets ◽  
A.M. de Roda Husman
Keyword(s):  
Risk Assessment ◽  
Risk Management ◽  
Drinking Water ◽  
The Netherlands ◽  
Water Safety ◽  
Safety Plan ◽  
Water Safety Plan ◽  
Current Risk

scholarly journals Effects of weather conditions on drinking water distribution pipe failures in the Netherlands

2018 ◽  
Vol 19 (2) ◽  
pp. 404-416 ◽  
Author(s):  
B. A. Wols ◽  
A. Vogelaar ◽  
A. Moerman ◽  
B. Raterman
Keyword(s):  
Drinking Water ◽  
The Netherlands ◽  
Water Distribution ◽  
Weather Conditions ◽  
Weather Data ◽  
Pipe Failure ◽  
Failure Data ◽  
Drinking Water Distribution ◽  
Soil Settlement ◽  
Remote Sensing Techniques

Abstract The influence of the weather parameters of temperature, wind and drought on pipe failure of drinking water distribution pipes was studied for the Netherlands. Several data sources were used relating weather effects to pipe failure: pipe failure data, regional weather data from different weather stations in the Netherlands, soil settlement data obtained from satellites and (modelled) pressure data. For asbestos-cement (AC) and cast iron (CI) pipes, temperature was an important factor. CI pipes showed increased pipe failures at low temperatures, which confirms results from previous studies, whereas AC pipes showed increased pipe failures at high temperatures. Pipe failure rates were higher for pipes that on average received higher internal pressures. This study also showed that wind resulted in additional pipe failures caused by uprooting of trees during a severe storm. With respect to drought, in some regions in the Netherlands, increased pipe failures during periods of drought were found. A small influence of soil settlement on pipe failure was found using remote-sensing techniques for a small area (5 × 10 km) in the Netherlands.

Influence of Combination of Two Plant Extracts and Liquid Minerals Supplementation in Drinking Water on Growth Performance and Meat Quality in Pigs

2020 ◽  
Author(s):  
Muhammad Ammar Dilawar ◽  
Hong-Seok Mun ◽  
Dhanushka Rathnayake ◽  
Myeong-Gil Jeong ◽  
Eun Ju Yang ◽  
...  
Keyword(s):  
Drinking Water ◽  
Growth Performance ◽  
Meat Quality ◽  
Plant Extracts ◽  
Microbial Count ◽  
A Value ◽  
Geranium Thunbergii ◽  
Fat Thickness ◽  
Dietary Treatments ◽  
Water Holding

A feeding trial was conducted by supplementing Mentha arvensis (MA), Geranium thunbergii (GT) and liquid minerals (LM) in drinking water of pigs and the effects on growth, carcass characteristics and meat quality were evaluated. A total of 80 pigs were allocated into 4 treatments: control (0% plant extracts, 0% LM), T1 (0.1% LM + 0.1% 1 MA: 4 GT), T2 (0.1% LM + 0.1% 4 MA:1 GT), T3 (0.1 % LM + 0.1% 1 MA:1 GT). Weight gain was significantly increased in T3. However, the dietary treatments had no significant effect on carcass weight, back fat thickness and water holding capacity (WHC). A significant reduction in cooking loss and shear force was observed in T2. Considering the meat color, T3 significantly increased the a* value. Microbial count was significantly decreased (P less than 0.05) at 0-week of storage in T3. Our studies indicate that plant extracts and liquid minerals enhances the growth performance and meat quality, without any adverse effects.

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