Comparing the efficiency of wastewater treatment technologies through a DEA metafrontier model

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

doi:10.1016/j.cej.2011.08.047

Cited by 105 publications

(65 citation statements)

References 32 publications

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“…Since Hayami and Ruttan [27] introduced the meta-production function, there have been studies on the metafrontier approach for efficiency and productivity analysis [9,11,12,[28][29][30][31][32]. Previously, efficiency was usually analyzed by independently estimating each group production frontier without taking differences in environmental factors, such as technology, economies of scale and region, etc.…”

Section: Metafrontier Dea Approachmentioning

confidence: 99%

“…As an empirical study, they presented the estimated technical efficiency of 97 countries which were classified into four different regional groups using agricultural sector data. Sala-Garrido, Molinos-Senante and Hernández-Sancho [29] used a metafrontier DEA approach to analyze the efficiency of 99 Spanish wastewater treatment plants (WWTPs) which were divided into four different alternative technology groups. A comparison of the calculated TGRs revealed that efficiency was optimal for WWTPs operating with activated sludge compared to other technologies.…”

Section: Metafrontier Dea Approachmentioning

confidence: 99%

“…TGR can be described in terms of the way the group frontier approaches the metafrontier. Thus, TGR was obtained by dividing the TE, which is the efficiency score obtained under the metafrontier, by TE k , the efficiency score obtained under the group frontier, and is defined as Equation (2) [9,29,40]:…”

Section: Analytic Modelmentioning

confidence: 99%

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Efficiency of Government-Sponsored R&D Projects: A Metafrontier DEA Approach

Park

Shin

2018

Sustainability

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Government R&D investments are steadily increasing with the perception that R&D plays an important role in technological innovation and sustainable economic growth. In particular, because biotechnology is recognized as one of the next growth engines, the Korean government has recently increased their investment in biotechnology R&D. However, careful analysis of the efficiency of government-sponsored R&D projects is still lacking. In this paper, we measured the technical efficiency and technology gap ratio to investigate the efficiency of Korean government-sponsored R&D projects of 16 sub-biotechnologies from 2007 to 2013 using a metafrontier Data Envelopment Analysis approach. There was no improvement in overall efficiency between 2007 and 2013. Biochip development technology has been the most efficient sub-biotechnology field and the least efficient fields have been biotechnology product safety and efficacy assessment technology. Medical science and engineering is the closest to optimal production technology among sub-biotechnologies. The efficiency of universities and government-funded research institutes is high, while the efficiency of companies is relatively low. The results suggest that the government should improve the R&D planning process and establish a customized R&D investment strategy that considers the characteristics of technologies and the seven organization types of R&D conductors to increase R&D efficiency.

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Section: Metafrontier Dea Approachmentioning

confidence: 99%

Section: Metafrontier Dea Approachmentioning

confidence: 99%

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Efficiency of Government-Sponsored R&D Projects: A Metafrontier DEA Approach

Park

Shin

2018

Sustainability

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“…[29]. Generally, the energy cost represents 15 to 40% of the total cost of operation of the WWTP, being only behind the workforce cost [30].…”

Section: Wastewater Treatment Energy Consumptionmentioning

confidence: 99%

Comparative Analysis of the Energy Consumption of Different Wastewater Treatment Plants

Soares¹

2017

IJAAA

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Abstract:Wastewater treatment is a process of intensive use of resources, mainly energy, which accounts for 15 to 40% of the operating costs in conventional wastewater treatment systems. With the expected demographic increase and the restrictive trend in quality standards for effluent discharge, the energy consumption tends to increase further if there are no changes in the processes. The literature gathers the energy consumption of different wastewater treatment systems, in an attempt to map the processes and to help the decision making in the search for better alternatives. One of these alternatives is the recovery of energy from the sewer. The conventional treatment system requires between 0.3 and 0.6 kWh/m 3 , while the energy contained in the wastewater may be up to 10 times of the one required for the treatment. The simultaneous wastewater treatment and power generation, called the hybrid treatment system, is a worldwide trend. In Brazil, recent studies have shown, through energy balances, the energy viability of anaerobic-aerobic systems, with the production of algae. This work presents a comparative review of the energy consumption of different wastewater treatment plants, aiming at a better understanding and management of the processes. The results showed that there are few Brazilian data published, indicating that the country still demands more studies on the subject to improve its processes. In the treatment of wastewater, most studies point to the aerobic process as the largest consumer of energy, and efforts are focused on the optimization of the conventional system, but still without great achievements. Environmental goals and water supply strategies are poorly integrated with the energy handling, leading to an inefficient use, and with economic and environmental consequences.

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“…The reasons behind these can be connected mainly changing economic 2 The pollutant removal efficiency is the point of expressing the capability of WWTP to prevent pollutants to inflow into the water recipient. Actually, pollutants are not literally removed, but their path is altered so that they can cause less danger to the environment, moreover to recycle all those materials e.g., nutrients contained in waste sewage can be used as fertilizers in agriculture [4,5].…”

Section: Introductionmentioning

confidence: 99%

The efficiency of municipal wastewater treatment with the reconstructed activated sludge method

Veres

Ditrói

Tóth

et al. 2014

J. Water Chem. Technol.

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ReceivedAbstract-Centralized wastewater treatment policy is a common challenge in Hungary. With the recent technology improvement of the Debrecen Wastewater Treatment Plant, the original activated sludge function system's maximum load is doubled, making it able to treat the influents of 7 settlements total. The introduced new technical constructions however required strict attention to be successfully implemented into the existing system. Retrofitting the overall processes caused disturbances affecting certain parameters in the biological elimination, thus modifying water quality of the effluent. Our experiments had aimed to control the performance of the plant after the reconstruction during test phase for more than a year period. It has been found that a slight increase of removal efficiency was achieved in the observed parameters of COD, BOD 5 , TP, SS, while TN remained in a moderate degree of enhancement. Retention effectiveness has begun to escalate significantly after a year of operation.

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Comparing the efficiency of wastewater treatment technologies through a DEA metafrontier model

Cited by 105 publications

References 32 publications

Efficiency of Government-Sponsored R&D Projects: A Metafrontier DEA Approach

Efficiency of Government-Sponsored R&D Projects: A Metafrontier DEA Approach

Comparative Analysis of the Energy Consumption of Different Wastewater Treatment Plants

The efficiency of municipal wastewater treatment with the reconstructed activated sludge method

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