Leo Heijnen BSc

Scientific researcher

030-6069743
Leo.Heijnen@kwrwater.nl
06-54296656

PCR methods for legal parameters

In determining the (hygienic) quality of drinking water, use is made of E. coli, intestinal enterococci and bacteria from the coli group (coliforms) as indicator organisms. Culture methods are the standard technique used to establish the presence…

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Preparation RT-PCR method enterococci

The routine determination of the safety of our drinking water is highly important. In practice this involves the use of a culture method for the intestinal bacteria E. coli and enterococci. This…

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Development of an RT-PCR for detecting enterococci

To determine quickly whether drinking water is hygienically reliable, it is important - in addition to the available RT-PCR method for E. coli - to have a method for detecting enterococci. This…

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High-throughput qPCR

Ever-faster, 'high-throughput qPCR' methods are becoming available for the simultaneous detection and identification of large quantities of genes. This study looks at how a number of promising methods compare with the qPCR methods already being used by…

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Microbial profiling in dune infiltration

DNA sequencing has made enormous strides over the past few years. The technology has advanced to the point where is should be possible, on the basis of information from the DNA (and…

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Exploring the potential of the qPCR technique in biological wastewater treatment

Within today’s wastewater treatment practice most attention is focused on achieving extensive and stable biological nutrient removal in the activated sludge process, including a stable biological phosphorus removal…

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Our expertises

Microbial water quality

News

News

Urgency and transparency drive research

06 July 2021 — Demand-driven research and open communications: two success factors in sector research for water companies (BTO). That has been…

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News

Sewage surveillance as an early warning system for SARS-CoV-2 detection

11 May 2021 — In recent research, we looked at how local sewage surveillance can provide information about the prevalence of the…

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News

Droplet Digital RT-PCR to detect SARS-CoV-2 variants of concern in wastewater

04 May 2021 — Wastewater monitoring has developed into a valuable and efficient tool to assess the prevalence of COVID-19 in the…

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News

Covid and the UK variant: the sewage tells the truth

13 April 2021 — Presence of Covid in the population Since the outbreak of the pandemic, already more than one year ago,…

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News

The Wastewater4COVID project aims to develop a method for early detection of the coronavirus

12 February 2021 — Early in the pandemic, Gertjan Medema demonstrated that genetic traces of SARS-CoV-2 in sewage correlate with COVID-19 disease…

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News

Concentration of SARS CoV-2 in sewage shows a descending trend

16 November 2020 — Since February 2020, we have measured the SARS -CoV-2 RNA in sewage water. By correcting the results for…

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News

Covid in wastewater: second wave as high as the first

06 November 2020 — As early as February, KWR demonstrated the connection between the number of SARS-CoV-2 viral particles in the sewage…

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News

Mülheim Water Award for rapid E. coli test with RT-PCR

18 September 2020 — KWR, AquaLab Zuid, Het Waterlaboratorium, the Vitens laboratory and Waterlaboratorium Noord have won the German Mülheim Water Award…

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News

BioMon: close collaboration in DNA biomonitoring

01 October 2018 — Naturalis Biodiversity Center, the Institute for Environmental Studies in Leiden, Baseclear and KWR are collaborating more and more…

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Water Sector

New DNA analysis method helps optimise biological phosphate removal

01 March 2016 — Royal HaskoningDHV and KWR have developed, within the Smart Water Systems theme of TKI Water Technology, a…

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Publications

All publications RSS Feed publications Microbiological Laboratory

PCR methods for legal parameters

Preparation RT-PCR method enterococci

Development of an RT-PCR for detecting enterococci

High-throughput qPCR

Microbial profiling in dune infiltration

Exploring the potential of the qPCR technique in biological wastewater treatment

Urgency and transparency drive research

Sewage surveillance as an early warning system for SARS-CoV-2 detection

Droplet Digital RT-PCR to detect SARS-CoV-2 variants of concern in wastewater

Covid and the UK variant: the sewage tells the truth

The Wastewater4COVID project aims to develop a method for early detection of the coronavirus

Concentration of SARS CoV-2 in sewage shows a descending trend

Covid in wastewater: second wave as high as the first

Mülheim Water Award for rapid E. coli test with RT-PCR

BioMon: close collaboration in DNA biomonitoring

New DNA analysis method helps optimise biological phosphate removal

Trendalert - Target enrichment voor moleculaire analysemethoden

Rise and fall of SARS-CoV-2 variants in Rotterdam: Comparison of wastewater and clinical surveillance

Interlaboratory comparison using inactivated SARS-CoV-2 variants as a feasible tool for quality control in COVID-19 wastewater monitoring

Normalisation of SARS-CoV-2 concentrations in wastewater: The use of flow, electrical conductivity and crAssphage

Verkenning van de mogelijkheden van eenvoudige DNA-analysetechnieken zonder PCR

Natuurlijke virussen voor bewaking integriteit membraanfiltratie systemen

Qualitative detection of E. coli in distributed drinking water using real-time reverse transcription PCR targeting 16S rRNA: Validation and practical experiences

Full-length 16S rRNA gene sequencing for improved taxonomic identification of bacterial communities