Energy efficiency in Spanish wastewater treatment plants: A non-radial DEA approach

Hernández-Sancho, Francesc; Molinos-Senante, María; Sala-Garrido, Ramón

doi:10.1016/j.scitotenv.2011.04.018

Cited by 266 publications

(112 citation statements)

References 31 publications

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“…Hern andez-Sancho and Sala-Garrido, 2009;Hernandez-Sancho et al, 2011;Sala-Garrido et al, 2012;Sala-Garrido et al, 2011. FEM It has simple model, and can deal with the multifactorial and uncertain problems.…”

Section: Methods Advantagesmentioning

confidence: 99%

“…In the field of production economics, the term of efficiency denotes the rational use of available resources, which means all production inputs are employed optimally based on the available technology (Hernandez-Sancho et al, 2011). Farrell (1957 pioneered the study of frontier functions as reference points to measure efficiency for each production unit.…”

Section: Data Envelopment Analysis (Dea)mentioning

confidence: 99%

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Constructing the ecological sanitation: a review on technology and methods

Fan

Wang

et al. 2016

Journal of Cleaner Production

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a b s t r a c tWastewater often contains valuable resources (e.g. organic matter and nutrients). Different from conventional sanitation approaches, the ecological sanitation (Eco-San) system is based on the closure of material flow cycles to recover resources with minimized demands on other resources. The review comprehensively summarized the main components of the Eco-San system (user interface, collection and conveyance, storage and primary treatment, and reuse/disposal), the frequently-used evaluation methods, and the framework of evaluation index system. Some typical practical cases were discussed to demonstrate the managerial implications and popularize the applications of the Eco-San system. The results show that the Eco-San systems are beneficial to resource efficiency, agricultural use of the organic matters and nutrients, and energy recovery although some shortages exist (e.g. high cost, cultural constraints, and complex operation and management). The evaluation methods can help to identify the restriction factors, contributing factors and measures to improve the efficiency of the future Eco-San system. The setting, selection and quantification are three critical steps when using the evaluation indices to complete the evaluation process. This study not only provides the methods for both developing novel Eco-San systems (combinations of the components) and improving the Eco-San systems (evaluation of the combinations) to solve the wastewater problem in rural areas. Considering the challenges or limitations in the Eco-San research, the recommendations for future research may mainly focus on the combination of different components, methods for sustainability assessment, quantification of the evaluation index, and implementation of more real Eco-San cases.

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Section: Methods Advantagesmentioning

confidence: 99%

Section: Data Envelopment Analysis (Dea)mentioning

confidence: 99%

Constructing the ecological sanitation: a review on technology and methods

Fan

Wang

et al. 2016

Journal of Cleaner Production

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“…Although it is true that, for Spain, quite a few have been published in this regard over the last few years. See, for example, Molinos-Senante et al [17][18][19], Lorenzo-Toja et al [20], Hernández-Sancho et al [5,21,22], Sala-Garrido et al [23][24][25], Hernández-Sancho and Sala-Garrido [26,27]. On the international level, mention should be made of the research carried out by Mahmoudi et al [28] for Iran, or De Jong et al [8], Kemp [29] for the Dutch WWTPs and Gerrini et al [15] for the Danish water services and WWTPs.…”

Section: Introductionmentioning

confidence: 99%

“…Most of those in the treatment field use a Data Envelopment Analysis (DEA) approach, although some include variations on the model: for example, Molinos-Senante et al [18] DEA with non-desirable outputs, Hernández-Sancho et al [22] and Molinos-Senante et al [19] use a non-radial DEA model, and Sala-Garrido et al [24] use a DEA approach with tolerances. Other studies use the influence of more specific aspects such as the effect of contextual factors on calculating the economic-environmental efficiency ratios [17,18,20], seasonal influences using Free Disposal Hull (FDH) or DEA and the Mann-Whitney test [5,25] or even the type of technology by using metafrontier approach with technological gap ratios [23].…”

Section: Introductionmentioning

confidence: 99%

“…The inputs used for the analyses range from purely economic data measured in euros per year, such as operation and maintenance costs, staffing, reagents, or energy costs, to technical data such as the water mass treated expressed as cubic meters. The studies by Hernández-Sancho et al [5,21,22], Hernández-Sancho and Sala-Garrido [26,27], Molinos-Senante et al [17][18][19], Sala-Garrido et al [23][24][25], or Lorenzo-Toja et al [20] include the elimination of contaminants from the treated water as output, calculating this on the basis of initial and final levels of solids in suspension (SS in mg/L), organic material expressed as a chemical demand for oxygen (COD, in mg/L) and nutrients. Apart from this, the last two studies mentioned also take into consideration non-desirable outputs such as sound, odor, and visual impact levels.…”

Section: Introductionmentioning

confidence: 99%

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Conditional Order-m Efficiency of Wastewater Treatment Plants: The Role of Environmental Factors

Fuentes

Torregrosa

Ballenilla

2015

Water

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Abstract:The growing economic and environmental importance of managing water resources at a global level also entails greater efforts and interest in improving the functioning and efficiency of the increasingly more numerous wastewater treatment plants (WWTPs). In this context, this study analyzes the efficiency of a uniform sample of plants of this type located in the region of Valencia (Spain). The type of efficiency measure used for this (conditional order-m efficiency) allows continuous and discrete contextual variables to be directly involved in the analysis and enables the assessment of their statistical significance and effect (positive or negative). The main findings of the study showed that the quality of the influent water and also the size and age of the plants had a significant influence on their efficiency levels. In particular, as regards the effect of such variables, the findings pointed to the existence of an inverse relationship between the quality of the influent water and the efficiency of the WWTPs. Also, a lower annual volume of treated water and more modern installations showed a positive influence. Additionally, the average efficiency levels observed turned out to be higher than those reported in previous studies.

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Literature Study for Dea Environmental Assessment

2018

Environmental Assessment on Energy and Sustainability by Data Envelopment Analysis

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Energy efficiency in Spanish wastewater treatment plants: A non-radial DEA approach

Cited by 266 publications

References 31 publications

Constructing the ecological sanitation: a review on technology and methods

Constructing the ecological sanitation: a review on technology and methods

Conditional Order-m Efficiency of Wastewater Treatment Plants: The Role of Environmental Factors

Literature Study for Dea Environmental Assessment

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