ENV-20 PARTNER REQUEST BBS Ref BIOPROP Title Biogas produc by happo6

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									ENV-20

PARTNER REQUEST

BBS Ref: BIOPROP

Title: Biogas production optimization in anaerobic digestion of wastewater treatment plants sludge

ABSTRACT:
Urban wastewater treatment processes constitute a major environmental problem due to the
generation of sludge during treatment. In some sewage plants, the sludge is stabilized by anaerobic
digestion, while other plants usually thicken and dehydrate it. The sludge is then sent to an
authorized manager. Finally, this dehydrated sludge is sent to landfill or incineration plants.

DESCRIPTION:
Urban wastewater treatment processes constitute a major environmental problem due to the
generation of sludge during treatment. In some sewage plants, the sludge is stabilized by anaerobic
digestion, while other plants usually thicken and dehydrate it. The sludge is then sent to an
authorized manager. Finally, this dehydrated sludge is sent to landfill or incineration plants.

All of these sludge management alternatives create environmental problems that must be minimized
or, at best, eliminated. The disposal of sludge in landfills is limited by Directive 99/31/EC. According
to this directive, the dumping of biodegradable waste in landfills will have to be reduced by
2016 to 35% of 1995 levels. Incineration processes, on the other hand, do not constitute a better
alternative as they require the application of appropriate treatments in order to reduce the emission
of air pollutants. In the anaerobic digestion process, the final digestate often contains
metal concentrations that impede its potential use as a fertilizer. Moreover, in many cases biogas
production levels are not very high, and the biogas produced in this way contains a significant
concentration of gases (SH2, siloxanes, etc.) which minimize its use as fuel and require
costly treatments for their purification.

The anaerobic digestion process of sewage plants sludge will be analyzed by studying several
different variables, both in raw sludge (generated at the sewage plant) and in dried sludge. This
optimization of the anaerobic digestion process should enable us:
     •  To achieve a high level of biogas production with a low presence of pollutants, which would
        convert the biogas obtained by this process into a real alternative to fossil fuels.
     •  To obtain a digestate with the appropriate characteristics for its use as a fertilizer (in terms
        of the presence of heavy metals, nutrients, etc.), thus avoiding the generation of waste
        during the process.
     •  To achieve these objectives it will be necessary to carry out several studies to ascertain the
        effect of specific variables on the characteristics of the produced biogas and on the
        digestate, such as:
            o Primary and secondary sludge mixtures (dried and raw sludge).
            o Reagents (employed in the drying process: polyelectrolytes, CaI, FeCl3, etc.).
     •  Sludge Pretreatment (thickened or dried) before being submitted to the anaerobic digestion
        process: thermal, chemical, ultrasounds, etc.
            o Co-digestion with other organic waste.
            o Operating Variables: Moisture, temperature (mesophilic and thermophilic range), etc.
     •  Different configurations (CSTR, SBR, PFR, one or two stages). Laboratory and pilot plant
        scale.
In addition to the experimental work, the aim is to study –via the application of the Life Cycle
Assessment (LCA) methodologies– the set-up that achieves the best results in terms of biogas
production, quality and characteristics of the digestate (in terms of the generation of greenhouse
gas emissions). This study can be carried out through the application of LCA software tools such as
SIMAPRO 7.1.


Development stage: Idea

European funding source(s):         Environment (including Climate Change)

Type of Project: FP7 Collaborative Research

Keywords: Environmental Engineering/Technology (010002004), Water
Pollution/Treatment (010002009), Waste Management (010003), Environment
(010002)

Organisation type: University

Organisation size : >500

Other details: Spanish University Research group experienced in LCA and wastewater treatments

Target partner organisation type(s): SME (<250 employees), Large Company, University,
Research/Technology Centre

Target partner expertise sought: Any of the necessary to develop a project in this FP7
(ENVIRONMENTAL) topic: ENV.2010.3.1.1.2 Innovative system solutions for municipal sludge
treatment and management)

Application domains: INDUSTRY, Chemical industry, ENERGY, ENVIRONMENT,
Environment protection, Waste management


Deadline for responses: 31/12/2009

								
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