A geothermal energy system for wastewater sludge drying and electricity production in a small island

Abstract Waste management and energy production are becoming critical issues in geographically disadvantaged areas, like small islands. For waste disposal the most common strategy is shipping to the mainland, due to the scarcity of land and local suitable treatments. Electricity generation is based on the importation of fossil fuels for local production, due to the lack of connections with continental energy networks. Both, waste shipping and fuels importation determine strong dependence on the mainland, as well as high economic and environmental cost for small islands. Therefore, using local renewable energy sources is extremely attracting. In this work, geothermal energy is considered for thermal drying of wastewater sludge and electricity supply of the whole wastewater treatment. The system is analysed for the case study of Pantelleria, a small island in Southern Italy, where sludge is currently dewatered to a final water content of 70–80%, and then shipped to mainland. The proposed system decreases wastewater sludge to be transported and disposed by 73.3%. Its profitability is demonstrated by several economic indicators, showing a Simple Payback time equal to 8.34 years and a Net Present Value of 502 k€. In addition, a sensitivity analysis for the main parameters affecting plant operation is carried out.

[1]  Donka Ivanova,et al.  Analytical and experimental study of combined fruit and vegetable dryer , 2001 .

[2]  J. Lund,et al.  Direct utilization of geothermal energy 2015 worldwide review , 2011 .

[3]  Laura Vanoli,et al.  Thermo-economic analysis of a novel cogeneration system for sewage sludge treatment , 2016 .

[4]  S. N. Sapali,et al.  Simulation and Parametric Analysis of Cryogenic Oxygen Plant for Biomass Gasification , 2012 .

[5]  Francesco Calise,et al.  A novel hybrid polygeneration system supplying energy and desalinated water by renewable sources in Pantelleria Island , 2017 .

[6]  Ying Chen,et al.  Grey relational analysis of an integrated cascade utilization system of geothermal water , 2016 .

[7]  M. Shah.  Chart correlation for saturated boiling heat transfer: Equations and further study , 1982 .

[8]  Daniele Fiaschi,et al.  An innovative ORC power plant layout for heat and power generation from medium- to low-temperature geothermal resources , 2014 .

[9]  Philipp Blechinger,et al.  Global analysis of the techno-economic potential of renewable energy hybrid systems on small islands , 2016 .

[10]  Sergio R. Galvan Gonzalez,et al.  Analysis of a sequential production of electricity, ice and drying of agricultural products by cascading geothermal energy , 2017 .

[11]  Lyes Bennamoun,et al.  Solar drying of wastewater sludge: A review , 2012 .

[12]  Yonghong Kuang,et al.  A review of renewable energy utilization in islands , 2016 .

[13]  Brian J. Anderson,et al.  Cost analysis of oil, gas, and geothermal well drilling , 2014 .

[14]  Ibrahim Dincer,et al.  Development, analysis and performance assessment of a combined solar and geothermal energy-based integrated system for multigeneration , 2017 .

[15]  S. Di Fraia,et al.  An integrated system for sewage sludge drying through solar energy and a combined heat and power unit fuelled by biogas , 2018, Energy Conversion and Management.

[16]  N. Duić,et al.  Renewislands—Renewable energy solutions for islands , 2007 .

[17]  Staša Borović,et al.  Utilization and tourism valorisation of geothermal waters in Croatia , 2015 .

[18]  S. Thórhallsson,et al.  Utilization of Geothermal Resources , 2015 .

[19]  Alessandro Sbrana,et al.  The Pantelleria caldera geothermal system: Data from the hydrothermal minerals , 1997 .

[20]  KAWERAU GEOTHERMAL DEVELOPMENT: A CASE STUDY , 1998 .

[21]  H. Jaster,et al.  Condensation heat transfer in a mixed flow regime , 1976 .

[22]  Juan M. Belman-Flores,et al.  Cascade utilization of low and medium enthalpy geothermal resources − A review , 2015 .

[23]  M. Carvalho,et al.  Analysis of potential for market penetration of renewable energy technologies in peripheral islands , 2000 .

[24]  G. Krajačić,et al.  RenewIslands methodology for sustainable energy and resource planning for islands , 2008 .

[25]  Freyr Sverrisson,et al.  Renewables 2014 : global status report , 2014 .

[26]  G. Chiodini,et al.  Carbon dioxide emission and heat release estimation for Pantelleria Island (Sicily, Italy) , 2014 .

[27]  Andreas Sumper,et al.  Renewable technologies for generation systems in islands and their application to Cozumel Island, Mexico , 2016 .

[28]  E. Michaelides.  Future directions and cycles for electricity production from geothermal resources , 2016 .

[29]  Mehmet Melikoglu,et al.  Geothermal energy in Turkey and around the World: A review of the literature and an analysis based on Turkey's Vision 2023 energy targets , 2017 .

[30]  V. L. Mathioudakis,et al.  Extended Dewatering of Sewage Sludge in Solar Drying Plants , 2009 .

[31]  Laura Vanoli,et al.  A novel energy assessment of urban wastewater treatment plants , 2018 .

[32]  G. Notton.  Importance of islands in renewable energy production and storage: The situation of the French islands , 2015 .

[33]  Francesco Calise,et al.  A novel solar-geothermal trigeneration system integrating water desalination: Design, dynamic simulation and economic assessment , 2016 .

[34]  James P. Brill,et al.  A Study of Two-Phase Flow in Inclined Pipes , 1973 .

[35]  Martha Mburu.  CASCADED USE OF GEOTHERMAL ENERGY: EBURRU CASE STUDY , 2012 .

[36]  D. Chisholm,et al.  Two-Phase Flow on the Shell-Side of a Segmentally Baffled Shell-and-Tube Heat Exchanger , 1979 .

[37]  E. Shamshiry,et al.  Integrated Models for Solid Waste Management in Tourism Regions: Langkawi Island, Malaysia , 2011, Journal of environmental and public health.

[38]  Anil Kumar,et al.  Recent developments in greenhouse solar drying: A review , 2018 .

[39]  Roberto Rendeiro Martín-Cejas,et al.  Incentives towards sustainable management of the municipal solid waste on islands , 2005 .

[40]  Francesco Calise,et al.  Thermoeconomic analysis and off-design performance of an organic Rankine cycle powered by medium-temperature heat sources , 2014 .

[42]  Shiyuan Li,et al.  Integrated drying and incineration of wet sewage sludge in combined bubbling and circulating fluidized bed units. , 2014, Waste management.

[43]  Electo Eduardo Silva Lora,et al.  Exergetic and economic comparison of ORC and Kalina cycle for low temperature enhanced geothermal system in Brazil , 2013 .

[44]  R. Lockhart.  Proposed Correlation of Data for Isothermal Two-Phase, Two-Component Flow in Pipes , 1949 .

[45]  Denis Clodic,et al.  Modeling of a solar and heat pump sludge drying system , 2008 .

[46]  Paul Bertheau,et al.  Assessment of the Global Potential for Renewable Energy Storage Systems on Small Islands , 2014 .

[47]  Zumar M.A. Bundhoo,et al.  Renewable energy exploitation in the small island developing state of Mauritius: Current practice and future potential , 2018 .

[48]  A. E. Dukler,et al.  Frictional pressure drop in two-phase flow: B. An approach through similarity analysis , 1964 .

[49]  J. Pasqualino,et al.  Renewable energy potential analysis in non-interconnected islands. Case study: Isla Grande, Corales del Rosario Archipelago, Colombia , 2017, Ecological Engineering.

[50]  Indradip Mitra,et al.  A renewable island life , 2006 .

[51]  Sanne Lemmens,et al.  Cost Engineering Techniques and Their Applicability for Cost Estimation of Organic Rankine Cycle Systems , 2016 .

[52]  R. Keey.  CHAPTER 9 – CONTINUOUS DRYING , 1972 .

[53]  Tiago L. Farias,et al.  The electric vehicles as a mean to reduce CO2 emissions and energy costs in isolated regions. The São Miguel (Azores) case study , 2012 .

[54]  Angélique Léonard,et al.  Review on fundamental aspect of application of drying process to wastewater sludge , 2013 .

[55]  Igor Bulatov,et al.  Cost estimation and energy price forecasts for economic evaluation of retrofit projects , 2003 .

[56]  Dieter Stapf,et al.  Screw pyrolysis technology for sewage sludge treatment. , 2017, Waste management.

[57]  R. DiPippo.  Combined and hybrid geothermal power systems , 2016 .

[58]  I. Dincer,et al.  Energy and exergy analyses of a new geothermal–solar energy based system , 2016 .

[59]  Christopher J. Koroneos,et al.  Exergy analysis for a proposed binary geothermal power plant in Nisyros Island, Greece , 2017 .

[60]  Francesco Calise,et al.  Exergetic and exergoeconomic analysis of a novel hybrid solar-geothermal polygeneration system producing energy and water , 2016 .

[61]  Guray Salihoglu,et al.  Solar drying in sludge management in Turkey , 2007 .

[62]  Abstr Act,et al.  PoteNtial develoPmeNt zoNes for Geothermal direct uses iN mexico with a sPecific site recommeNdatioN , 2012 .

[63]  John W. Lund,et al.  Direct utilization of geothermal energy 2010 worldwide review , 2011 .

[64]  K. Kimmerle,et al.  Energy recovery from sewage sludge by means of fluidised bed gasification. , 2008, Waste management.

[65]  J. Pinnekamp,et al.  VOLUME REDUCTION AND BIOLOGICAL STABILIZATION OF SLUDGE IN SMALL SEWAGE PLANTS BY SOLAR DRYING , 2002 .

[66]  Marco A. R. Nascimento,et al.  Technical and economic analyses of waste heat energy recovery from internal combustion engines by the Organic Rankine Cycle , 2016 .

[67]  Carlos E. Romero,et al.  Techno-economic assessment for the integration into a multi-product plant based on cascade utilization of geothermal energy , 2016 .

[68]  D. Ivanova,et al.  Energy and economic effectiveness of a fruit and vegetable dryer , 2003 .

[69]  Nugroho Agung Pambudi,et al.  Geothermal power generation in Indonesia, a country within the ring of fire: Current status, future development and policy , 2018 .

[70]  John W. Lund,et al.  Direct utilization of geothermal energy. , 2010 .

[71]  Ruggero Bertani,et al.  Geothermal power generation in the world 2005–2010 update report , 2012 .

[72]  Jialing Zhu,et al.  A review of geothermal energy resources, development, and applications in China: Current status and prospects , 2015 .

[73]  Dimitrios Papastefanakis,et al.  Renewable energy sources (RES) projects and their barriers on a regional scale: The case study of wind parks in the Dodecanese islands, Greece , 2009 .

[74]  Neven Duić,et al.  Increasing renewable energy sources in island energy supply : case study Porto Santo , 2004 .

[75]  S. Simon,et al.  Carbon neutral archipelago – 100% renewable energy supply for the Canary Islands , 2017 .

[76]  Giovanni Gianelli,et al.  Water–rock interaction in the active geothermal system of Pantelleria, Italy , 2001 .

[77]  Alexandros Kelessidis,et al.  Comparative study of the methods used for treatment and final disposal of sewage sludge in European countries. , 2012, Waste management.

[78]  Anastasia Zabaniotou,et al.  Towards sewage sludge based biofuels via thermochemical conversion – A review , 2012 .

[79]  Kyle Astill,et al.  Design Of A Low-Impact Wastewater Collection And Treatment System For Siladen Island In Indonesia , 2014 .