22 research outputs found
Beleidsanalyse Tolkamer
No full textEen studie met belanghebbenden om de voor- en nadelen van een coupure in de waterkering in Tolkamer duidelijk en overzichtelijk te maken ten behoeve van een keuze voor een alternatief zonder coupure, met coupure of met coupure en fiets- en voetgangersbrug. De probleemstelling is dat, door de versterking van de waterkering voor Tolkamer, de relatie tussen Tolkamer en de rivier wordt verbroken, hetgeen een negatieve invloed heeft op de belevingswaarden en de rekreatieve aantrekkelijkheid en daarmee op de belangen van Tolkamer. Er dient een keuze te worden gemaakt voor een uit te voeren alternatief, op basis van een objektieve vergelijking van de verschillende alternatieven
Hoe vrij is uw eigendom?: De registratie van publiekrechtelijke beperkingen
No full textVerslag van de studieochtend "Hoe vrij is uw eigendom?" op 9 april 1997, georganiseerd door Vereniging voor Geografische informatie en Vastgoedinformatie (VGVI) i.s.m. het ministerie van Volkshuisvesting, Ruimtelijke Ordening en Milieubeheer (VROM). De studieochtend is georganiseerd door de Vereniging voor Geografische informatie en Vastgoedinformatie (VGVI) i.s.m. het ministerie van Volkshuisvesting, Ruimtelijke Ordening en Milieubeheer (VROM)
OverHolland 20: Architectonisch studies voor de Hollandse stad
No full textImage editing / beeldredactie by: Otto Diesfeldt, Iskandar Pané, i.s.m. Joran Kuijper, Iris van der WasHistory, Form & Aesthetic
Futures Forum: Toekomst van werk in 2025
No full textToekomstverkenning door Center for people and Buildings i.s.m. Hospitality Group en 12 grote kantoorhoudende organisaties waaronder belastingdienst, SVB, ING, ministerie van Binnenlandse Zaken, Kadaster, ABN Amro
Biofouling in open recirculating cooling systems: Characterization and control of biofilms and Legionella pneumophila
No full textOpen recirculating cooling systems have been vital elements in industry since the early 20th century. Their purpose is to release excess heat from processes through water evaporation so that production can be carried out at optimal temperature. With the global development of industrial activities such as manufacturing, electricity and chemical production, the demand for cooling capacity keeps increasing. Biofouling is one of the main phenomena negatively affecting the performance of wet cooling systems. This phenomenon leads to: (i) loss of heat transfer efficiency, (ii) clogging, (iii) microbiologically influenced corrosion, and (iv) health risk associated to the development of pathogens. Controlling bacterial growth in open recirculating cooling systems is very challenging, and is generally performed via dosage of disinfectants such as sodium hypochlorite. Due to biofouling and the increasing concerns linked to chemical consumption and water discharge, attention has been given to investigate more sustainable approaches to cooling systems operation. Knowledge on the bacterial communities, disinfection impact and biofilm composition is however limited and a more in-depth characterization of biofouling is required to effectively establish new control strategies. The objectives of this thesis were to contribute to the available knowledge on biofouling in cooling systems and to investigate sustainable and predictable alternative operations, providing results of direct relevance to practice. Attention was given to the identification of factors selecting the microbiome of cooling water subjected to conventional operation, characterization of cooling tower biofilms without disinfection, and assessment of the impact of temperature on biofilm composition. Then, alternative approaches to biofouling control were tested at pilot-scale. Phosphorus depletion was investigated as a solution for limiting biofilm growth and high pH was considered as a Legionella pneumophila control method. These studies were performed with the use of recent analytical methods such as next generation amplicon sequencing (NGS), quantitative polymerase chain reaction (qPCR), and flow-cytometry, which allowed collection of valuable data and a better characterization of biofouling...BT/Environmental Biotechnolog
Bulletin bij het congres "Gebiedsontwikkeling slim vlottrekken"
No full textIn deze publicatie wordt de balans opgemaakt voor een aantal specifieke typen vastgoed en wordt een beeld geschetst van de benodigde structurele hervormingen op het gebied van wonen, pensioenen en de zorg. De inhoud van deze publicatie is gebaseerd op het praktijkcongres ‘Gebiedsontwikkeling slim vlottrekken’, georganiseerd door de praktijkleerstoel Gebiedsontwikkeling van de TU Delft i.s.m. ROSTRA congrescommunicatie op donderdag 15 maart 2012 in het Vorstelijk Complex in Utrecht, onder voorzitterschap van Hans de Jonge, hoogleraar vastgoed management en directievoorzitter Brink Groep.Real Estate and HousingArchitecture and The Built Environmen
Bacterial community dynamics and disinfection impact in cooling water systems
No full textUnderstanding the bacterial dynamics in cooling towers is imperative for the assessment of disinfection efficiency and management of microbial risks linked to aerosol formation. The objective of this study was to evaluate the impact of feed water on the cooling water bacterial microbiome and investigate the survival ability of its members when exposed to continuous chlorine disinfection. Water from an industrial cooling water system (2600 m3/h) was collected over a 5-month period at 3 locations along the feed water line and 3 locations in the cooling tower. ATP measurements suggested that the average ATP-per-cell in the cooling tower evolved independently from the average ATP-per-cell in the feed water. Flow cytometry and 16S rRNA gene amplicon sequencing were then combined to quantify the bacterial dynamics in the whole system. A mass balance based equation was established to determine net growth and net decay of the cooling tower bacterial communities in order to evaluate the impact of continuous chlorination (0.35–0.41 mg Cl2/L residual chlorine). The results indicated that cooling tower main community members were determined by the input feed water microbiome and the bacterial community structure was further shaped by varying decay rates of the microorganisms. Notably, the order Obscuribacterales showed to be growing in the cooling tower in the presence of residual chlorine up to 0.4 mg Cl2/L, with a recurrent net growth of 260 ± 95%, taking into account the impact of the concentration factor. This conclusion was only possible thanks to the systematic analysis described in this paper and generates discussion about the resistance of Obscuribacterales to residual chlorine. The described mass balance approach provides a high level of understanding on bacterial dynamics and should be considered for future characterization studies of cooling towers in which accurate investigation of microbiome changes is essential.BT/Environmental Biotechnolog
Proces, kosten en tevredenheid bij zelfbouw in Almere
No full textOTBArchitecture and The Built Environmen
Assessment of the impact of temperature on biofilm composition with a laboratory heat exchanger module
No full textTemperature change over the length of heat exchangers might be an important factor affect-ing biofouling. This research aimed at assessing the impact of temperature on biofilm accumulation and composition with respect to bacterial community and extracellular polymeric substances. Two identical laboratory-scale plate heat exchanger modules were developed and tested. Tap water sup-plemented with nutrients was fed to the two modules to enhance biofilm formation. One “reference” module was kept at 20.0 ± 1.4◦ C and one “heated” module was operated with a counter-flow hot water stream resulting in a bulk water gradient from 20 to 27◦ C. Biofilms were grown during 40 days, sampled, and characterized using 16S rRNA gene amplicon sequencing, EPS extraction, FTIR, protein and polysaccharide quantifications. The experiments were performed in consecutive triplicate. Monitoring of heat transfer resistance in the heated module displayed a replicable biofilm growth profile. The module was shown suitable to study the impact of temperature on biofouling formation. Biofilm analyses revealed: (i) comparable amounts of biofilms and EPS yield in the reference and heated modules, (ii) a significantly different protein to polysaccharide ratio in the EPS of the reference (5.4 ± 1.0%) and heated modules (7.8 ± 2.1%), caused by a relatively lower extracellular sugar production at elevated temperatures, and (iii) a strong shift in bacterial community composition with increasing temperature. The outcomes of the study, therefore, suggest that heat induces a change in biofilm bacterial community members and EPS composition, which should be taken into consideration when investigating heat exchanger biofouling and cleaning strategies. Research potential and optimization of the heat exchanger modules are discussed.</p
Visies op onderhoudsplanning van schoolgebouwen
No full textOTB Research Institute for the Built Environmen
