Abstract
The high volumes of animal manure and sewage sludge, as a consequence of the development of intensive and specialized cattle dairy farms in peri-urban areas, pose challenges to local environmental quality and demands for systems innovation. Besides these negative impacts, energy recovery from biogas produced in anaerobic co-digestion processes should contribute to local sustainable development. This research considers technical data obtained from the optimization of biomethanization processes using sewage sludge and cattle manure liquid fraction, aiming to develop a spatially explicit model including multicriteria evaluation and an analytical hierarchy process to locate biogas production facilities, allocate energy resources and consider biogas unit pre-dimensioning analysis. According to the biophysical conditions and socioeconomic dynamics of the study area (Vila do Conde, Northwest Portugal), a spatially explicit model using multicriteria and multiobjective techniques allowed the definition of suitable locations, as well as the allocation of resources and support pre-dimensioning of biogas facilities. A p-median model allowed us to allocate resources and pre-dimensioning biogas facilities according to distance and accessibility elements. The results indicate: (i) the location of areas with adequate environmental conditions and socioeconomic suitability advantages to install biogas production facilities, and (ii) the ability to compare the options of centralized or distributed location alternatives and associated pre-dimensioning.
Highlights
Economic competitive advantages found inurban areas promote population concentration, increasing rural-urban interfaces [1] and fostering changes in local consumption patterns and in waste and wastewater spatio-temporal production [2]
The mild climate conditions associated with water and soil with high chemical, physical and biological quality favor the suitability for agroforestry activities and the intensification, concentration and specialization of dairy cattle farms [36]
The results indicate that sewage sludge and dairy cattle manure production present diffe3r.e3n. tEsnpvairtoianlmaenndtatle,mSopcoiarlaalnpdatEtecornnos.mMicuCnriicteipriaaliwn aBsitoegwasaPtelarnist Ldoisctartiibonuted according to con
Summary
Economic competitive advantages found in (peri)urban areas promote population concentration, increasing rural-urban interfaces [1] and fostering changes in local consumption patterns and in waste and wastewater spatio-temporal production [2] These processes contribute to sewage sludge (SwS) and animal manure production and accumulation [3] originating from local rural and urban activities, causing potential pressures and impacts on quality of life and natural resource management [4,5] of these complex socio-ecological systems [6]. As major energy consumers within municipalities [10], need to adopt strategies that enhance the eco-efficiency of their facilities and that seek to support other realities within the territory, such as waste and wastewater generating activities, that still lack proper treatment In this context, dairy intensive farms, as large waste producers, still need the implementation of treatment technologies that promote the energetic valorization of this substrate typology. The location, dimensioning and operation of some wastewater treatment plants (WWTPs) may be optimized with the integration of both waste and wastewater in order to meet the project dimensioning parameters
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