Influence of aeration rate on composting gaseous emissions with pig slaughterhouse sludge

This study investigated the influence of composting aeration rate on emission concentrations in terms of ammonia, hydrogen sulphide, mercaptan, and Volatile Organic Compounds (VOCs). The influence of the aeration on the gaseous emission was the first process conditions investigated.

Further Authors:
A. De-Guardia - Irstea
D. Wolbert - Ecole Nationale Supérieure de Chimie de Rennes
M. Lemasle - Ecole Nationale Supérieure de Chimie de Rennes
M. Daumoin - Irstea

Organic waste composting generates emissions resulting in a significant level of nuisance often leading to conflicts closing or preventing the installation of treatment plants. Ammonia, hydrogen sulphide and VOCs are the maincontributors to compost odours. Conventional solutions are designed to confine the odours or apply a biological orchemical treatment. By establishing the relationship between aeration rate and compost gaseous Emission characteristics, preventive control techniques can be introduced. The project investigated the influence of the aeration rate on compost emissions from pig slaughterhouse sludge, using 300 L pilots reactors under forced aeration. Five different rates were tested: 1.68, 4.03, 6.22, 9.80 and13.04 L/h/kg of wet waste. The aeration treatment was applied to the same waste mixture consisting of Pig Slaughterhouse Sludge (PSS) and Wood Chips (WC), mixed at a dry mass ratio of 1.2:1(PSS:WC). The Wood Chips (WC) came from the same plot of calibrated 20-40 mm particle size. All experimental materials were analyzed and weighed before starting the experiment. Composting treatments were aerated during 30 to 60 days, and the material was turned every 10 days. The aeration rate was maintained constant while monitoring the compost temperature. The incoming and out going ventilation air streams were monitored for O2, CO2 and CH4. A portion of the outgoing ventilation air stream was alsobubbled into chemical traps for NH3, H2S and mercaptan quantification. Every two days, another portion of the outgoing ventilation air stream was collected using Tedlar bag and its gases trapped on activated carbon trap to analyzeits VOC by Gas Chromatography coupled with a Mass Spectrometry (GC/MS); qualification and quantification of VOCs were obtained by chromatogram processing. At the end of the experiment, all reactors were emptied, to weig hand sample their content for a mass balance analysis.In terms of composting emissions, over 45 VOCs were identified and classified based on their concentration:major constituents (nitrides, sulphides, ketones and alcohols); average constituents (nitride and sulphide compounds,aromatic hydrocarbons and aliphatic hydrocarbons), and minor constituents (terpenes, alkanes, and acids). The concentration of these compounds was based on the concentration over time per kg organic matter of initial wet PSS waste within the air flow rate. The analysis of emission concentrations indicated that higher aeration rates increased emissions, but had noinfluence on the final waste stability simply because low rates resulted in a longer treatment period and more turning operations. Thus, higher aeration rate enhanced the stripping of gases from the compost matrix. Nevertheless, increasingthe aeration rate changed the emission profile with higher rate producing emission peaks rather than an even profileassociated with the lower aeration rates. As a result, an aeration strategy must be considered to optimize the treatment of gaseous emissions from pig slaughterhouse sludge composting plant.



Copyright: © European Compost Network ECN e.V.
Quelle: Orbit 2012 (Juni 2012)
Seiten: 9
Preis inkl. MwSt.: € 9,00
Autor: Vincent Blazy
Jean-Claude Benoist
Suzelle Barrington

Artikel weiterleiten In den Warenkorb legen Artikel kommentieren


Diese Fachartikel könnten Sie auch interessieren:

Post-treatment of Composting Leachate by Photocatalytic Process
© Wasteconsult International (5/2015)
In this study the capability of UV-ZnO photocatalytic process as a post Treatment method for composting leachate was examined at laboratory scale and in batch mode. The effect of some factors such as initial pH, oxidant concentration, light intensity and reaction time on the removal of organic load and color of leachate were investigated. Biological pre-treated leachate samples were collected from the effluent of leachate treatment facility of a composting plant in north of Iran. A Plexiglas column with 110 mm inner diameter and 300 mm height were used to conduct experiments. UVC lamps with different power levels in the range of 8-40W at the centre of the column were used as the source of irradiation. Based on the results of experiments, after 180 minutes of Radiation with 32W UVC lamps in pH 11 and in the presence of 1g.L-1 of slurry ZnO, maximum COD and color removal were achieved to be 57% and 67%, respectively.

Auswirkungen der BioAbfV, der IED-Richtlinie und BVT auf neue und bestehende Bioabfallbehandlungsanlagen
© Witzenhausen-Institut für Abfall, Umwelt und Energie GmbH (11/2013)
Die Entsorgungswirtschaft – einschließlich der Betreiber von Bioabfallbehandlungsanlagen – hat bereits heute ein strenges Regime bei der Zulassung von Abfallbehandlungsanlagen zu beachten. Der überwiegende Teil der Anlagen ist nach dem Bundes-Immissionsschutzgesetz (BlmSchG) genehmigt. Das Kapitel 8 der Vierten Verordnung zur Durchführung des BlmSchG (4. BlmSchV) befasst sich allein mit Anlagen zur Verwertung und Beseitigung von Abfällen und sonstigen Stoffen.

Neubau eines Kompostwerks mit Biogaserzeugung im Bioenergiepark Saerbeck
© Witzenhausen-Institut für Abfall, Umwelt und Energie GmbH (11/2013)
Die Entsorgungsgesellschaft Steinfurt (EGST) wurde vor fast genau 20 Jahren gegründet. Über seine Beteiligungsgesellschaft ist der Kreis Steinfurt heute alleiniger Gesellschafter. Die EGST hat ihren Sitz in Altenberge.

Erweiterung einer Kompostanlage um eine anaerobe Behandlung
© Arbeitsgemeinschaft Stoffspezifische Abfallbehandlung ASA e.V. (9/2012)
Der Landkreis Kassel hat seit über 15 Jahren die Biotonne flächendeckend eingeführt. Durch das Einheits-Gebührensystem ist eine hohe Bioabfallerfassungsrate realisiert worden, denn jedes Grundstück erhält eine 240 l – Biotonne kostenlos zum Restabfallgefäß dazu. Entsprechend hoch ist die spezifische Menge an Bio- und Grünabfällen von über 200 kg/Einwohner und Jahr. Damit gehört der Landkreis Kassel bundesweit zu den Spitzenreitern (Durchschnitt Hessen: 130 kg/E*a). Insgesamt werden bei 237.000 Einwohnern ca. 42.000 t Bioabfälle und 6.000 t Grünabfälle eingesammelt.

Digestate and compost quality - case studies at anaerobic disgestion plants with the BTA Process
© European Compost Network ECN e.V. (6/2012)
The key for the successful anaerobic digestion of biowaste and/or municipal solid waste is an efficient removal of the impurities before the digestion step. This is not only indispensable for the reliability of the process and therefore the plant availability, but furthermore for the quality of the produced digestate or final compost. With the existing developments within the EU, the quality of the digestate / compost has become a focus of attention. Further Authors: P. Bolzano - Biotec Sistemi s.r.l. J. Del’haye - IVVO

Name:

Passwort:

 Angemeldet bleiben

Passwort vergessen?

SIUS GmbH
der Spezialist für biologische
und mechanisch-biologische
Verwertung organischer Stoffe