document

Techno-economic assessment of membrane gas absorption for the production of carbon dioxide from flue gas

Feron, P.H.M. (author), Jansen, A.E. (author), Instituut voor Milieuwetenschappen TNO (author)

Membrane gas absorption for carbon dioxide production from flue gases is discussed with special reference to the economics of the supply of carbon dioxide to greenhouses in the Netherlands. Novel absorption liquids have been introduced which show as excellent performance in terms of system stability and mass transfer when used in combination...

conference paper 1998

document

Control of bulking in a full scale plant by addition of talc (PE 8418)

Eikelboom, D.H. (author), Grovenstein, J. (author), Instituut voor Milieuwetenschappen TNO (author)

A very severe bulking problem (Type 021N) in the water treatment plant of Bodegraven in The Netherlands was solved by the addition of a specially shaped talqueous powder, PE 8418. After addition of this mineral product, the SVI dropped almost instantaneously from 850 ml/g to 250 ml/g and over the next 2 weeks decreased further to 100 to 125 ml/g...

article 1998

document

Conditions and mechanisms affecting simultaneous nitrification and denitrification in a Pasveer oxidation ditch

Hao, X. (author), Doddema, H.J. (author), van Groenestijn, J.W. (author), Instituut voor Milieuwetenschappen TNO (author)

Simultaneous nitrification and denitrification in a Pasveer oxidation ditch was studied. The purpose was to evaluate the performances of both nitrification and dentrification in oxidation ditches, and to pursue some possible approaches to enhance nitrogen removal. Almost complete nitrification was observed under normal conditions, but when DO <...

article 1997

document

Budget calculations for ozone and its precursors: Seasonal and episodic features based on model simulations

Memmesheimer, M. (author), Ebel, A. (author), Roemer, M. (author), Instituut voor Milieuwetenschappen TNO (author)

Results from two air quality models (LOTOS, EURAD) have been used to analyse the contribution of the different terms in the continuity equation to the budget of ozone, NO(x) and PAN. Both models cover large parts of Europe and describe the processes relevant for tropospheric chemistry and dynamics. One of the models is designed to simulate...

article 1997

document

Effects of chlorpyrifos on individuals and populations of Daphnia pulex in the laboratory and field

van der Hoeven, N. (author), Gerritsen, A.A.M. (author), Instituut voor Milieuwetenschappen TNO Centraal Instituut voor Voedingsonderzoek TNO (author)

Effects of the insecticide chlorpyrifos (cpf) on young (<l d old) and adult (7-9 d old) Daphnia pulex and the ability of D. pulex to recover after exposure were tested in the laboratory. Populations of D. pulex exposed to cpf were studied in the laboratory and field. In the field, cpf was applied in a single dose. The effects of that dose on D....

article 1997

document

Micrometeorological measurement of the dry deposition flux of sulphate and nitrate aerosols to coniferous forest

Instituut voor Milieuwetenschappen TNO (author), Wyers, G.P. (author), Duyzer, J.H. (author)

Dry deposition fluxes of sulphate and nitrate have been determined over a coniferous canopy using the aerodynamic gradient technique. Vertical concentration gradients of sulphate and nitrate were measured with filters; the gradient of ammonium bisulphate was measured with thermodenuders. Filter measurements of sulphate yielded a deposition...

article 1997

document

Evaluation of a membrane based carbon dioxide absorber for spacecraft ECLS applications

Feron, P.H.M. (author), Eckhard, F. (author), Witt, J. (author), Instituut voor Milieuwetenschappen TNO (author)

In an on-going harmonized ESA/NIVR project, performed by Stork Comprimo and TNO-MEP, the removal of the carbon dioxide with membranes is studied. The use of membrane gas absorption for carbon dioxide removal is currently hampered by the fact that the commonly used alkanolamines result in leakage problems when using polyolefin membranes. This...

conference paper 1996

document

Measurements of the atmospheric emission of N2O from biogenic sources in general and by grassland ecosystems in particular

Duyzer, J. (author), Instituut voor Milieuwetenschappen TNO (author)

The project is part of the 'Integrated N20 grassland project'. The project carried out at TNO aims to determine the atmospheric emissions of N20 from biogenic surface sources in the Netherlands. The following activities were part of the project : • determination of N20 emissions from grassland • comparison of methods to measure N20 emissions in...

article 1995

document

Exchange of ozone and nitrogen oxides between the atmosphere and coniferous forest

Duyzer, J.H. (author), Weststrate, J.H. (author), Walton, S. (author), Instituut voor Milieuwetenschappen TNO (author)

The deposition flux of O3 to a Douglas fir forest in the Netherlands was monitored by eddy correlation during nine months. At the same time the concentration gradients of NO, NO2 and O3 were determined over the forest. The canopy resistance to O3 uptake was calculated from the measurements ant it compared well with model estimates. The...

conference paper 1995

document

Styrene removal from waste gas by the fungus Exophiala jeanselmei in a biofilter

Instituut voor Milieuwetenschappen TNO (author), Cox, H.H.J. (author)

Styrene is an environmental pollutant, emitted in large quantities to the atmosphere by various industrial sectors. Legislation requires industry to reduce the emission of styrene. One option to purify industrial waste gases is biological treatment in biofilters.

doctoral thesis 1995

document

Het vrijkomen van asbest bij brand: onderzoek naar de emissie van asbestvezels door het uiteenvallen van asbestcementprodukten bij brand

Instituut voor Milieuwetenschappen TNO (author), Tempelman, J. (author), den Boeft, J. (author)

report 1995

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Methane emissions due to oil and natural gas operations in The Netherlands

Instituut voor Milieuwetenschappen TNO (author), Oonk, J. (author), Vosbeek, M.E.J.P. (author)

report 1995

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Leidraad voor de Inventarisatie van de Milieugevolgen van Industriele Ongevallen (Leidraad Milieugevolgen). Gebruikershandleiding

Instituut voor Milieuwetenschappen TNO (author), de Weger, D. (author), Blom-Bruggeman, J.M. (author), Molag, M. (author)

report 1995

document

Deposition of nitrogen dioxide and ozone to European forests - Volume 1

Instituut voor Milieuwetenschappen TNO (author), Duyzer, J.H. (author)

report 1995

document

Herkomst van pesticiden in regen water in zuid -Holland

Instituut voor Milieuwetenschappen TNO (author), van Pruissen, O.P. (author)

report 1995

document

Dry deposition of nitrogen dioxide and ozone to European forests - Volume 2

Instituut voor Milieuwetenschappen TNO (author), Duyzer, J.H. (author)

report 1995

document

Battery selection and testing for a fuel cell/battery hybrid electric vehicle

Brunia, A. (author), Kluiters, C.E. (author), Schmal, D. (author), Instituut voor Milieuwetenschappen TNO (author)

The project "Brass-board integration of a reformer/fuel cell/battery/electric motor system for electric traction" contributes to the development of a new and environmentally friendly power source for electrically driven cars. This research is carried out by Loughborough university of rechnology (united Kingdom), TECNARS s.r.l. (Iraly), ECN,...

conference paper 1994

document

Tropospheric ozone and the greenhouse effect

Roemer, M.G.M. (author), van den Hout, K.D. (author), Builtjes, P.J.H. (author), Instituut voor Milieuwetenschappen TNO (author)

Global changes in emissions of the non-greenhouse gases nitrogen oxides (N0x), Volatile Organic Compounds (VOCs) and carbon monoxide (CO), affect the concentrations of greenhouse gases, in particular of ozone. The chemical mechanisms causing these changes were investigated with a global two-dimensional model, and the greenhouse effect of...

article 1994

document

Alternative methods for internal quality control in research laboratories for environmental analysis: A programme for the performance evaluation of equipment, methods and staff

Wieling, J. (author), Bakkeren, H.A. (author), Peters, R.J.B. (author), van Gils, W.J.C.G. (author), de Leer, E.W.B. (author), Mulder, S.A. (author), van der Burg, P.A. (author), van Renesse van Duivenbode, J.A.D. (author), Instituut voor Milieuwetenschappen TNO (author)

In analytical research laboratories, the problem of quality assurance is more difficult to solve than in laboratories devoted exclusively to routine analysis: the former usually have to deal with a much greater variety of samples and may have to develop entirely new methods of analysis. For research laboratories we have developed several...

article 1994

document

De invloed van gedragsaspecten op emissies van personenauto's

Instituut voor Milieuwetenschappen TNO (author), Pulles, M.P.J. (author), de Leu, L.T. (author)

report 1994