Wolfgang Uhl

Wolfgang Uhl
Aquateam COWI AS

Professor Dr.-Ing.

About

120
Publications
25,629
Reads
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860
Citations
Additional affiliations
November 2019 - present
Aquateam COWI AS
Position
  • Project Manager
Description
  • Providing Leadership to the team
November 2019 - April 2021
COWI
Position
  • Senior Specialist
January 2018 - present
Norwegian University of Science and Technology
Position
  • Professor (Associate)
Education
January 1996 - April 2000
University of Duisburg-Essen
Field of study
  • Mechanical Process Engineering
August 1986 - February 1988
Lund University
Field of study
  • Biotechnology
October 1982 - June 1989
Karlsruhe Institute of Technology
Field of study
  • Chemical Engineering

Publications

Publications (120)
Article
Full-text available
Solar radiation experiments showed a shift in the composition of natural organic matter (NOM). Due to irradiation, the concentration of high molecular weight (HMW) molecules decreased, and that of the low molecular weight (LMW) fraction increased. Microbiological analyses showed that biodegradation was neglectable. To assess the consequences for wa...
Conference Paper
A new approach towards digitalization, which means automation, of the coagulation processes in water treatment is followed, including the identification of suitable process parameters and their association with coagulation process performance. At first, the reliability of UV254 data is discussed with regard to effects of particles present. These ef...
Conference Paper
Neben Algenblüten verursachen Massenentwicklungen von Bakterien weltweit eine zu-nehmende Verschlechterung der Gewässerqualität. Dadurch sind nicht nur die Ökosys-teme an sich bedroht. Die schädlichen Auswirkungen dieser Ereignisse stellen vor allem beim Management von Wasserressourcen, die der Trinkwasserproduktion, Bewässerung und Fischerei diene...
Conference Paper
Water supply managers are facing increasing challenges in quickly and almost unpredictably changing raw water qualities. A new method was developed to describe and predict the interrelation between raw water quality indicators, in particular those which are related to climate and seasonal changes. This enables a sustainable management of resources...
Article
Full-text available
Concentrations of genetic markers for antibiotic resistance genes (ARGs) were measured in the effluents of three Norwegian wastewater treatment plants (WWTPs) and in a receiving river upstream and downstream of the discharge point of one WWTP. Calculations based on mass balances were carried out to evaluate the impact of river flow rates and treatm...
Book
Full-text available
It is challenging to deliver a general assessment of the nature of as well as the probability for direct discharge of ARB and ARG into effluent WW and applied sludge. This is due to the combined complexity of resistance carriers, traits, various sources of variation, and the WW systems. Moreover, there is currently a lack of harmonized methods and...
Article
Full-text available
In many parts of the world drinking water storage takes place in near-house or in-house tanks. This can impact drinking water quality considerably. International and numerous national standards and guidelines addressing the construction, installation and operation of domestic drinking water storage tanks are reviewed on their consideration of water...
Article
Full-text available
The effectivity of different treatment stages at two large wastewater treatment plants (WWTPs) located in Oslo, Norway, to remove antibiotic resistant E. coli from municipal wastewater was investigated. The WWTPs were effective in reducing the total cultivable E. coli. The E. coli in WWTP samples were partly resistant to ampicillin (6-27 %) and co-...
Article
The removal of cell free DNA (plasmids) carrying antibiotic resistance genes (ARGs) was investigated at bench-scale using ultrafiltration (UF), nanofiltration (NF) and reverse osmosis (RO) membranes commonly applied in water reuse applications. The removal of the plasmid spiked to ultrapure water was determined using a direct qPCR method. More than...
Book
Full-text available
The simultaneous population explosion and the growing lack of clean water today requires disruptively innovative solutions in water remediation. The last decade has witnessed the emergence of various nanomaterials capable of bridging the gap between the demand for and supply of clean water. Accelerated research on finding suitable nanomaterials in...
Conference Paper
Full-text available
The research aimed to generate data on the abundance of antibiotic resistance genes (ARG) in WWTP effluents and in the receiving water body. The contribution of ARG discharge to ARG in the recipient was estimated by using mass balances. Several scenarios were simulated, including different WWTP treatment effectivities at various river flow rates.
Article
Full-text available
The simultaneous population explosion and the growing lack of clean water today requires disruptively innovative solutions in water remediation. The last decade has witnessed the emergence of various nanomaterials capable of bridging the gap between the demand for and supply of clean water. Accelerated research on finding suitable nanomaterials in...
Article
To mitigate microbial activity in swimming pools and to assure hygienic safety for bathers, pool systems have a re-circulating water system ensuring continuous water treatment and disinfection by chlorination. A major drawback associated with the use of chlorine as disinfectant is its potential to react with precursor substances present in pool wat...
Article
Full-text available
Drinking water treatment plants (DWTPs) designed to remove natural organic matter (NOM) are challenged as concentrations of NOM in raw waters are increasing. Here, we assess seasonal differences in NOM quality and quantity, from raw waters to the distribution network, at three large DWTPs in Oslo, Stockholm and Helsinki. Samples, collected during s...
Chapter
Am Beispiel zweier großer Abwasserkläranlagen in Oslo (NO) wurde die Wirksamkeit der verschiedenen Behandlungsschritte auf die Entfernung von antibiotika-resistenten E. coli aus städtischen Abwässern untersucht. Die Beseitigung der gesamt-kultivierbaren E. coli aus dem Abwasser war in beiden Anlagen unvollständig. Die Bakterien wiesen teilweise ein...
Article
Forekomsten av utvalgte markørgener for antimikrobiell resistens (AMR) i vannprøver tatt fra utslippet av tre norske avløpsrenseanlegg ble kvantifisert. 16S rRNA, Intl1 og Sul1 er de tre dominerende antibiotikaresistensgenene (ARG) i utslippsvannet fra anleggene. Like høye konsentrasjoner av de fleste ARG som ble detektert i prøvene på alle anlegge...
Article
https://issuu.com/norsk_vann/docs/vannspeilet_4-2018/36 Antimikrobiell resistens (AMR) er en global utfordring som kan medføre store negative konsekvenser, både helsemessige og økonomiske. NIVA har undersøkt tre kommunale avløpsrenseanlegg med hensyn til forekomst av utvalgte antibiotikaresistente bakterier (ARB) og antibiotikaresistensgener (ARG)...
Article
Inorganic chloramines (mono-, di- and trichloramine) are formed in swimming pool water from the unintended reaction of free chlorine with ammonia that is introduced by bathers. Monochloramine is of particular interest as it is known to react further in pool water forming harmful DBPs, such carcinogenic N-nitrosodimethylamine (NDMA). During pool wat...
Book
Full-text available
In the course of the project, 72 triplicate samples from 24 waterworks in Norway and 72 blanks were analysed for microplastic particles. From the findings in this study, it is concluded that concentrations of less than 4.1 microplastic particles per litre should not be given or used for comparison. Whenever analysis is done to elucidate a possible...
Poster
_ Increase in antibiotic resistant bacteria (ARB) is recognized as a global health security challenge _ Antibiotic resistance genes (ARGs) can be horizontally transferred between and to different types of bacteria and is thus considered an emerging contaminant _ Urban wastewater treatment plants (WWTPs) are identified as antibiotic resistance hot...
Article
Full-text available
Effektiviteten av de ulike behandlingstrinnene for fjerning av antibiotikaresistente E. coli i avløpsvann fra to store avløpsrenseanlegg i Oslo ble undersøkt. Renseanleggene reduserer den totale mengden kultiverbare E. coli fra avløpsvannet effektivt, men fjerningen av disse bakteriene var ufullstendig i begge anleggene. Bakteriene var delvis resis...
Article
The effectivity of different treatment stages at two large wastewater treatment plants ( WWTPs) located in Oslo, Norway, to remove antibiotic resistant E. coli from municipal wastewater was investigated. The WWTPs were effective in reducing the total cultivable E. coli. The E. coli in WWTP samples were partly resistant to ampicillin (6-27 %) and c...
Article
Full-text available
The effectivity of different treatment stages at two large wastewater treatment plants (WWTPs) located in Oslo, Norway, to remove antibiotic resistant Escherichia coli from municipal wastewater was investigated. The WWTPs were effective in reducing the total cultivable E. coli. The E. coli in WWTP samples were mainly resistant to ampicillin (6–27%)...
Article
Overall apparent reaction rates for the removal of monochloramine (MCA) in granular activated carbon (GAC) beds were determined using a fixed-bed reactor system and under conditions typical for swimming pool water treatment. Reaction rates dropped and quasi-stationary conditions were reached quickly. Diffusional mass transport in the pores was show...
Article
Oxidation and coagulation before ceramic microfiltration (CMF) greatly increases membrane flux, but is unconventional for reverse osmosis (RO) pre-treatment. Impacts to RO and the wastewater recycling scheme operating CMF at high flux conditions is little understood. In this work, wastewater was treated with ozone or ultraviolet/hydrogen peroxide (...
Article
Full-text available
A long-channel membrane test cell (LCMTC) with the same length as full-scale elements was developed to simulate performance and fouling in nanofiltration and reverse osmosis spiral-wound membrane modules (SWMs). The transparent LCMTC enabled simultaneous monitoring of SWM performance indicators: feed channel pressure drop, permeate flux and salt pa...
Article
The extent and mechanisms by which organic material in a solution can be retained and foul a membrane largely depends on the molecular weight of the material being filtered and the molecular weight cut-off (MWCO) of the membrane. The present study investigated the effect of the MWCO of a membrane and the molecular weight distribution of natural org...
Book
Full-text available
An evidence-based assessment of decentralized and local water management concepts and how they relate to smart city concepts is presented. Decentralized water management is based on the principle of integrated water cycle management and water-sensitive urban design. A “smart city” is generally defined as a city seeking to address public issues via...
Article
Full-text available
Three models using compound properties to calculate Freundlich constants for adsorption of SOCs on activated carbon were evaluated using data obtained from the literature and in own experiments. The models are based on Polanyi’s potential theory, Linear Solvation Energy Relationships (LSERs) and a solubility normalisation of the Freundlich equilibr...
Article
Biofilms are detrimental to many industrial systems that include reverse osmosis (RO) membranes. Accordingly, the development of surfaces with inherently bactericidal properties has attracted much research attention. Antimicrobial peptides (AMPs) have been shown to be potent antimicrobial and anti-biofilm agents. In the current study, we developed...
Article
Full-text available
This study focuses on the effect of rapid mixing on the coagulation efficiency in a full-scale drinking-water treatment plant and discusses the mechanisms involved in the floc-formation process. The results refer to three periods of operation of the waterworks when no mechanical mixing was provided in the tanks for coagulant dosing due to mechanica...
Article
A second order kinetic model for simulating chlorine decay in bulk water due to the reaction with dissolved organic matter (DOM) was developed. It takes into account the decreasing reactivity of dissolved organic matter using a variable reaction rate coefficient (VRRC) which decreases with an increasing conversion. The concentration of reducing spe...
Article
Biofouling is a ubiquitous problem in many places in society and technology, especially in reverse osmosis or nanofiltration (NF) processes. Initial stages in the development of the biofilm include attachment of bacteria to the surface, where bacterial outer membrane components such as biopolymers, lipids, and proteins play important roles. Here we...
Article
Biofouling is a ubiquitous problem in many places in society and technology, especially in reverse osmosis or nanofiltration (NF) processes. Initial stages in the development of the biofilm include attachment of bacteria to the surface, where bacterial outer membrane components such as biopolymers, lipids, and proteins play important roles. Here we...
Article
Full-text available
The sorption behavior of the herbicides atrazine, alachlor and trifluralin on four sorbents (two modified organoclays, one model sediment, and one natural sediment) in three water matrices (synthetic water, natural groundwater and surface water) was investigated. The influence of the sorbent and water matrix characteristics was elucidated. All adso...
Article
Für die Abschätzung möglicher Strategien zur Bewältigung der zukünftigen Herausforderungen bei der Trinkwasser-versorgung der Hauptstadt Brasiliens, Brasília DF, fand eine Analyse der gegenwärtigen Wasserversorgungssituation statt. Daraus erfolgte die Ableitung eines Konzepts für die zukünftige Wasseraufbereitung in dieser Region. Dabei galt es, di...
Article
Full-text available
In this study a standardised evaluation routine was developed to determine real particle density in form of a particle density distribution from sedimentation analysis. Sedimentation analysis was performed to determine particle settling velocity as a function of settled distance over time by monitoring the settling particles in a sedimentation appa...
Article
To assess strategies to overcome the future challenges in drinking water treatment and supply for the capital of Brazil, Brasília and its Federal District, the current state was reviewed. Based on this analysis, possible ways of improving water supply in the future were proposed for this region. For the development of a concept, the special feature...
Article
Adding chemicals to the biofluid is an option to mitigate membrane fouling in membrane bioreactors. In particular, previous studies have shown that the addition of particles could enhance activated sludge filterability. Nevertheless, the mechanisms responsible for the improved filtration performance when particles are added are still unclear. Two m...
Article
Full-text available
An optimised flushing routine for drinking water distribution system maintenance was developed for the distribution system of a Lower Saxon water board using a dynamic particle transport model. The development of the optimised flushing routine was based on the determination of the particulate load, the mathematical description of particle transport...
Article
In tertiary wastewater desalination, effective minimization and cleaning of membrane fouling requires an understanding of the physicochemical interactions between conditioning film–membrane surface, conditioning film–bacteria, bacteria–EPS and within the EPS. In this study, the effect of conditioning film on the attachment of bacteria and EPS (isol...
Article
Full-text available
Based on the theoretical principles on the removal of deposits from water distribution systems, an effective and efficient flushing mode – the unidirectional flushing – is presented and described. When compared with other flushing modes it is shown an example that flushing time shortens, water demand decreases and a fast formation of new deposit la...
Article
Backwash procedures for deep bed filters were evaluated and compared by means of a new integrated approach based on productivity. For this, different backwash procedures were experimentally evaluated by using a pilot plant for direct filtration. A standard backwash mode as applied in practice served as a reference and effluent turbidity was used as...
Article
Full-text available
A multidisciplinary approach was applied in this work to characterise natural organic matter and evaluate the performance of a full-scale waterworks treating organic-rich surface water. It was shown that the combination of the treatment processes considered efficiently removed the dissolved organic matter, including its specific fractions. Most of...
Article
Full-text available
Dammed drinking water reservoirs with their catchment areas and the downstream rivers are dynamic systems that change permanently under the influence of many factors. Their multifunctional use for drinking water supply, flood control, energy production, nature conservation and recreation as well as ecological constraints for the rivers downstream r...