![]() This paper demonstrates the importance of evaluating change in eco-productivity over time and in identifying the drivers associated with those changes, both of which can be used to support decision-making focused on the sustainability of WWTPs. Moreover, operational costs and greenhouse gases emissions were the main drivers reducing eco-productivity. Our results illustrate that although eco-productivity improved in half of the WWTPs we assessed, there was still potential for improving some eco-efficiency components. This approach allows one to obtain an eco-productivity change index for each major component of the WRDDM model (costs, pollutants removal, and greenhouse gas emissions). To overcome this more » temporal limitation, this paper evaluates dynamic eco-efficiency (changes in eco-productivity over time) of WWTPs using the dynamic weighted Russell directional distance model (WRDDM). However, those models provided only a static assessment in that they ignored possible fluctuations over time within each plant. When conducting air sampling to determine whether an employee. Occupational Safety and Hazard Administration (OSHA) defines the breathing zone as the area within a ten-inch radius of the workers face. The efficiency of the ventilation system was analysed by measuring particle size and concentration, ventilation effectiveness and the Indoor/Outdoor ratio. What Does Breathing Zone Mean The breathing zone in a workplace is defined as the area closest to an employees mouth and nostrils. Several previous papers have evaluated the eco-efficiency of WWTPs using data envelopment analysis (DEA) models. The measurements aimed to analyse the particle removal efficiency in the breathing zone and the impact of particle concentration on an individual at the workstation. Abstract: Improving eco-efficiency of wastewater treatment plants (WWTPs) has been identified as being essential for achieving urban sustainability. Considering that the average concentration of droplet aerosols in the entire indoor area is generally lower than that in the breathing zone in Fig. Operational costs were the main responsible of negative eco-technical change. The maximum concentration in the breathing zone is presented in the case of PLT-0.9, the value of which is 8.46 × 10 4 pcs/m 3, which is more than twice that of ISO5.Most of the plants evaluated worsened its eco-efficiency over time.Individual drivers (costs, pollutants, GHG) of eco-productivity were quantified.Temporal dynamics of eco-efficiency were measured for wastewater treatment plants.
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