References of "Hiligsmann, Serge"
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See detailDevelopment Of An Enzymatic Assay For The Determination Of Cellulose Bioavailability In Municipal Solid Waste
Rodriguez, Christian; Hiligsmann, Serge ULg; Ongena, Marc ULg et al

in Biodegradation (2005), 16(5), 415-422

As there is a constant need to assess the biodegradation potential of refuse disposed of in landfills, we have developed a method to evaluate the biodegradability of cellulosic compounds (cellulose and ... [more ▼]

As there is a constant need to assess the biodegradation potential of refuse disposed of in landfills, we have developed a method to evaluate the biodegradability of cellulosic compounds (cellulose and hemicellulose) in municipal solid waste. This test is based on the quantification of monosaccharids released after the hydrolysis of solid waste samples with an optimised enzyme preparation containing commercially available cellulases and hemicellulases. We show that the amounts of monosaccharids could be related to the biodegradability of the cellulosic material contained in the samples. This enzymatic cellulose degradation test was assayed on 26 samples originating from two Belgian landfills and collected at different depths. As results correlated well with those obtained with a classical biochemical methane potential assay, this new and rapid test is sufficiently reliable to evaluate cellulose bioavailability in waste samples. [less ▲]

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See detailCellulose bioavailability in municipal solid waste
Rodriguez, Ch.; Hiligsmann, Serge ULg; Charlier, Robert ULg et al

Poster (2003, May 09)

Detailed reference viewed: 16 (4 ULg)
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See detailCellulose enzymatic availability in Municipal solid waste
Rodriguez, C.; Hiligsmann, Serge ULg; Ongena, MARC ULg et al

in Christensen; Cossu; Stegmann (Eds.) Proceedings Sardinia 03, Ninth International Waste Management and Landfill Symposium (2003)

We recently developed a new and rapid method to evaluate the biological reactivity of cellulose in Municipal Solid Waste (MSW). This test is based on the enzymatic hydrolysis of cellulose in MSW and can ... [more ▼]

We recently developed a new and rapid method to evaluate the biological reactivity of cellulose in Municipal Solid Waste (MSW). This test is based on the enzymatic hydrolysis of cellulose in MSW and can be related to the digestibility of this polymer in MSW. In this work, we showed that the enzymatic cellulose degradation test (ECD) correlated well with a Biochemical Methane Potential (BMP) assay so that the ECD test can be reliably applied to estimate cellulose bioavailability in various waste samples. These tests have also been used to evaluate the influence of some important parameters that could affect the extent and the rate of cellulose degradation in waste. It appeared that cellulose enzymatic hydrolysis is related to the moisture content but no clear relationship could be established with the cellulose content. Moreover, it is shown that acetic acid produced by the anaerobic degradation of organic matter, and responsible for high COD in young leachates, may slow down or inhibit the enzymatic hydrolysis step and the methanogenesis. [less ▲]

Detailed reference viewed: 92 (4 ULg)
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See detailInvestigation of the Biological Activity and the Environmental Impact of Tunisian MSW Landfills
Mhiri, F.; Marouani, L.; Benzarti, A. et al

in Christensen; Cossu; Stegmann (Eds.) Proceedings Sardinia 03, Ninth International Waste Management and Landfill Symposium (2003)

This paper presents the results of the investigation of the biological activity that takes place in three municipal solid waste landfills (MSW landfills) situated in different regions of two dry climate ... [more ▼]

This paper presents the results of the investigation of the biological activity that takes place in three municipal solid waste landfills (MSW landfills) situated in different regions of two dry climate in Tunisia. Since the climatic water balance is negative (potential evapotranspiration being 1.5 to 5 times higher than rainfall), it has often been considered that this kind of landfill has neither environmental impact nor efficient biological activity. However, the three landfills revealed a biological activity with biogas often containing more than 60 percent of methane. Indeed, the upper waste layer that was effectively dry (dry weight from 85 to 98%), the core of refuse contained between 35 and 65% of dry matter. In some boreholes, the produced gases periodically expelled leachates like small geysers. Therefore, the results assess that landfill management in countries with dry climate should be considered with adapted technologies, not necessary the same as under temperate or humid climates. [less ▲]

Detailed reference viewed: 28 (3 ULg)
See detailLa problématique de la gestion des déchets ménagers
Thonart, Philippe ULg; Lardinois, M.; Rodriguez, Ch. et al

Conference (2002, November)

Detailed reference viewed: 16 (1 ULg)
See detailCellulose bioavailability in waste
Rodriguez, Ch.; Hiligsmann, Serge ULg; Lardinois, M. et al

Poster (2002, October)

Detailed reference viewed: 10 (1 ULg)
See detailLa problématique de la gestion des déchets ménagers en République d'Haïti
Thonart, Philippe ULg; Lardinois, M.; Rodriguez, Ch. et al

Conference (2002, July 01)

Detailed reference viewed: 25 (2 ULg)
See detailImpact environnemental des décharges de déchets ménagers sur la qualité des eaux
Hiligsmann, Serge ULg; Lardinois, M.; Rodirguez, Ch. et al

Poster (2002, June)

Detailed reference viewed: 9 (2 ULg)
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See detailInvestigation of the biological activity in MSW landfills under dry climates (Tunisia and Haiti)
Hiligsmann, Serge ULg; Lardinois, M.; Rodriguez, C. et al

in Kocasoy, G.; Atabarut, T.; Nuhoglu, I. (Eds.) Appropriate environmental and solid waste management and technologies for developing countries (2002)

This paper presents the results of the investigations carried out over two years (April 2000 – February 2002) to quantify the biological activity that develops in four municipal solid waste landfills ... [more ▼]

This paper presents the results of the investigations carried out over two years (April 2000 – February 2002) to quantify the biological activity that develops in four municipal solid waste landfills located in different regions of two dry climate countries i.e. Haiti and Tunisia. Since the climatic water balance is negative (potential evapotranspiration being 1.5 to 5 times higher than rainfall), it has often been considered that this kind of landfill has neither environmental impact nor efficient biological activity. However, after five campaigns of sampling and analysis at different seasons, the results of the investigations show a relatively stable biological activity in the four landfills with biogas often containing more than 60 percent of methane. Indeed, under the upper waste layer that was effectively dry (dry weight from 85 to 98 %), the core of refuse contained between 35 and 65 % of dry matter. In some boreholes, the produced gases periodically expelled leachates like small geysers. Therefore, the results assert that landfill management in countries with dry climate should be considered with adapted technologies, not necessary the same as under temperate or humid climates. [less ▲]

Detailed reference viewed: 37 (1 ULg)
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See detailAtlas of MSW landfills and dumpsites in developing countries
Lardinois, M.; Hiligsmann, Serge ULg; Rodriguez, C. et al

in Kocasoy, G.; Atabarut, T.; Nuhoglu, I. (Eds.) Appropriate environmental and solid waste management and technologies for developing countries (2002)

This paper presents the results of a six-year experience in collecting data on landfills and dumpsites in developing countries. Information such as the position of a landfill, its size and the way it is ... [more ▼]

This paper presents the results of a six-year experience in collecting data on landfills and dumpsites in developing countries. Information such as the position of a landfill, its size and the way it is managed are gathered in a database. The characterisation of wastes is also performed. Finally the actions taken or to be taken on each site are summarized. The purpose of such a project is to keep in memory all the information available about the main landfills and dumpsites in developing countries. This allows the identification and the management of their negative impacts on the environment. Furthermore, this tool will be of first help to set up proper rehabilitation projects. At present time, information about 85 landfills from 13 countries has been collected. The main partners of this project are Tunisia, Haiti, Senegal, Burkina Faso and Cuba. Besides those factual partnerships, new collaboration projects are being discussed with other countries such as Guinea. This work has already received the positive support of people involved in waste management in West Africa. The Atlas of MSW landfills and dumpsites in developing countries is published on the Internet (http://www.ulg.ac.be/cwbi/index.htm). Thanks to the support of the IEPF (Institut de l'Energie et de l'Environnement de la Francophonie / Institute for Energy and Environment in French talking Countries; IEPF is a member of AIF), it will be entirely updated and diffused on a broad range. This includes development of a new relational database and Internet site and the edition of a paper version of the Atlas. [less ▲]

Detailed reference viewed: 67 (4 ULg)
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See detailCellulose enzymatic availability in waste refuse
Rodriguez, C.; Hiligsmann, Serge ULg; Lardinois, M. et al

in Christensen; Cossu; Stegmann (Eds.) Proceedings Sardinia 01, Eight International Waste Management and Landfill Symposium (2001)

This work presents an original method for testing the biological reactivity of cellulose. This test specifically targets one of the limiting steps of cellulose bioconversion into biogas, i.e. the ... [more ▼]

This work presents an original method for testing the biological reactivity of cellulose. This test specifically targets one of the limiting steps of cellulose bioconversion into biogas, i.e. the cellulose hydrolysis. From this point of view, enzymes-mediated hydrolysis has been performed to evaluate cellulose bioavailability in refuse samples from different layers of an old landfill. The relationship between the cellulose enzymatic accessibility and the lignin contents has also been studied. Similarly, the correlation between cellulose, lignin and humic acid contents has been investigated. On the other hand, moisture content in landfills is considered as one of the most important factors that favours methanogenesis. In this respect, the influence of moisture content on cellulose enzymatic hydrolysis has also been evaluated. [less ▲]

Detailed reference viewed: 54 (1 ULg)
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See detailAtlas of MSW landfills and dumpsites in developing countries
Lardinois, M.; Hiligsmann, Serge ULg; Kapepula, D. et al

in Christensen; Cossu; Stegmann (Eds.) Proceedings Sardinia 01, Eight International Waste Management and Landfill Symposium (2001)

This paper presents the results of a five-year experience in collecting data's on landfills and dumpsites in developing countries. At present time, information about 81 landfills from 12 countries has ... [more ▼]

This paper presents the results of a five-year experience in collecting data's on landfills and dumpsites in developing countries. At present time, information about 81 landfills from 12 countries has been collected. The main partners of this project are Tunisia, Haiti, Senegal and Burkina Faso. Besides those factual partnerships, new collaboration projects are being discussed with Guinea, Cuba, Vietnam and Kuwait. The data are gathered in the Atlas of MSW landfills and dumpsites in developing countries and are published on the Internet (http://www.ulg.ac.be/cwbi/index.htm). The purpose of such a project is to keep in memory the existence and characterisation of the main landfills and dumpsites in order to allow the identification and the management of their negative impacts on the environment. Moreover, it will be useful to set up proper rehabilitation projects. This work has already received the positive support of people involved in waste management in West Africa. [less ▲]

Detailed reference viewed: 20 (1 ULg)
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See detailA pluridisciplinary model to predict municipal landfill life
Hiligsmann, Serge ULg; Rodriguez, C.; Lardinois, M. et al

Conference (2001)

Most degradation processes that occur within municipal wastes landfills result from different microbial activities interacting all along the landfill lifetime and that are influenced by several non ... [more ▼]

Most degradation processes that occur within municipal wastes landfills result from different microbial activities interacting all along the landfill lifetime and that are influenced by several non-biological factors. These complex biological and chemical processes require a multidisciplinary pattern in order to assess and control their environmental impact. Thanks to Walloon Region support, we have developed a pattern or model combining the evolution of different key parameters. Such parameters qualify biogas (composition, production rate), leachate (pH, BOD5, COD, volatile fatty acids, redox potential, nitrogen balance, humic acids...), or solid waste (moisture, settlement, cellulose content...). This paper presents relationships, including our model, between these parameters. Variations of pH, BOD5/COD ratio, sulfate concentration in leachates, gas composition analysis and settlement measures allow to predict landfill age, on a standard scale, since completion. Evaluation of cellulose and water content in refuse as well as settlement degree are useful to estimate the time required for complete biological degradation. [less ▲]

Detailed reference viewed: 35 (6 ULg)
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See detailInvestigation of the biological activity in MSW landfills under dry climates (Tunisia and Haiti)
Hiligsmann, Serge ULg; Lardinois, Mathias; Rodriguez, Christian et al

in Christensen; Cossu; Stegmann (Eds.) Proceedings Sardinia 01, Eight International Waste Management and Landfill Symposium (2001)

This paper presents the results of the investigation of the biological activity that takes place in four municipal solid waste landfills situated in different regions of two dry climate countries i.e ... [more ▼]

This paper presents the results of the investigation of the biological activity that takes place in four municipal solid waste landfills situated in different regions of two dry climate countries i.e. Haiti and Tunisia. Since the climatic water balance is negative (potential evapotranspiration being 1.5 to 5 times higher than rainfall), it has often been considered that this kind of landfill has neither environmental impact nor efficient biological activity. However, the four landfills revealed a biological activity with biogas often containing more than 60 percent of methane. Indeed, under the upper waste layer that was effectively dry (dry weight from 85 to 98 %), the core of refuse contained between 35 and 65 % of dry matter. In some boreholes, the produced gases periodically expelled leachates like small geysers. Therefore, the results assess that landfill management in countries with dry climate should be considered with adapted technologies, not necessary the same as under temperate or humid climates [less ▲]

Detailed reference viewed: 56 (10 ULg)
See detailBioavailability of cellulose in landfills.
Rodriguez, Ch.; Lardinois, M.; Geurts, A. et al

Poster (2000, March 31)

Detailed reference viewed: 2 (0 ULg)
See detailLa gestion des déchets organiques solides dans les pays à climat chaud
Hiligsmann, Serge ULg; Lardinois, M.; Kapepula, D. et al

Article for general public (2000)

Detailed reference viewed: 18 (3 ULg)
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See detailEffect of Temperature on Growth of Psychrophilic and Psychrotrophic Members of Rhodotorula Aurantiaca
Sabri, Ahmed ULg; Jacques, Philippe; Weekers, Frederic et al

in Applied Biochemistry and Biotechnology (2000), 84-86(Spring), 391-9

The thermo-dependence of growth kinetic parameters was investigated for the Antarctic psychrophilic strain Rhodotorula aurantiaca and a psychrotrophic strain of the same species isolated in Belgium ... [more ▼]

The thermo-dependence of growth kinetic parameters was investigated for the Antarctic psychrophilic strain Rhodotorula aurantiaca and a psychrotrophic strain of the same species isolated in Belgium (Ardennes area). Cell production, maximum growth rate (mu max), and half-saturation constant for glucose uptake (Ks) of both yeasts were temperature dependent. For the two yeasts, a maximum cell production was observed at about 0 degree C, and cell production decreased when temperature increased. The mu max values for both strains increased with temperature up to a maximum of 10 degrees C for the psychrophilic strain and 17 degrees C for the psychrotrophic strain. For both yeasts, Ks for glucose was relatively constant at low temperatures. It increased at temperatures above 10 degrees C for the psychrophilic strain and 17 degrees C for the psychrotrophic strain. Although its glucose affinity was lower, the psychrotrophic strain grew more rapidly than the psychrophilic one. The difference in growth rate and substrate affinity was related to the origin of the strain and the adaptation strategy of R. aurantiaca to environmental conditions. [less ▲]

Detailed reference viewed: 108 (21 ULg)
See detailCritères de sélection des sites d'implantation des CET.
Hiligsmann, Serge ULg; Lardinois, M.; Thonart, Philippe ULg

Conference (1999, September)

Detailed reference viewed: 6 (2 ULg)