Search Results

1 - 10 of 116 items :

  • "efficiency" x
  • Energy Engineering x
Clear All
Retention Efficiency of Vegetative Filter Strips for Nitrogen in Danjiangkou Reservoir Area, Central China

.09.039. [18] Faulkner JW, Zhang W, Geohring LD, Steenhuis TS. Nutrient transport within three vegetative treatment areas receiving silage bunker runoff. J Environ Manage. 2011;92:587-595. DOI: 10.1016/j.jenvman.2010.09.020. [19] Shin J, Gil K. Environ. Effect of rainfall characteristics on removal efficiency evaluation in vegetative filter strips. Earth Sci. 2014;72:601-607. DOI: 10.1007/s12665-013-2995-6. [20] Santin FM, Silva RVD, Grzybowski JMV. Artificial neural network ensembles and the design of performance-oriented riparian buffer strips for the filtering

Open access
Effects of Different Irrigation Strategies on Soil Water, Salt, and Nitrate Nitrogen Transport

] Bower C, Ogata G, Tucker J. Rootzone salt profiles and alfalfa growth as influenced by irrigation water salinity and leaching fraction. Agron J. 1969;61(5):783-785. DOI: 10.2134/agronj1969.00021962006100050039x. [39] Da Silva VDPR, Da Cunha Campos JHB, De Azevedo PV. Water-use efficiency and evapotranspiration of mango orchard grown in northeastern region of Brazil. Sci Hortic-Amsterdam. 2009;120(4):467-472. DOI: 10.1016/j.scienta.2008.12.005. [40] Migliaccio KW, Schaffer B, Crane JH, Davies FS. Plant response to evapotranspiration and soil water sensor

Open access
Application of the reduced I-V Blaesser’s characteristics in predicting PV modules and cells conversion efficiency in medium and high insolation conditions

References [1] Rodziewicz T, Rajfur M, Wacławek M. The use of two-diode substitute model in predicting the efficiency of PV conversion in low solar conditions. Ecol Chem Eng S. 2017;24(2):177-202. DOI: 10.1515/eces-2017-0012. [2] IEC 60904-3, 2 nd edition. Photovoltaic devices - Part 3: Measurement principles for terrestrial photovoltaic (PV) solar devices with reference spectral irradiance data. Geneva: 2008. http://www.iec.ch/dyn/www/f?p=103:23:0::::FSP_ORG_ID:1276 . [3] Coors S, Böhm M. Validation and comparison of curve correction

Open access
The Use of Two-Diode Substitute Model in Predicting the Efficiency of PV Conversion in Low Solar Conditions

-V Curves of Si Solar Cells. Proc. 21th Eur. Photovoltaic Solar Energy Conference and Exhibition. Dresden: 2006. http://www-old.mpi-halle.mpg.de/mpi/publi/pdf/7197_06.pdf. [14] Schenk A, Krumbein U. Coupled defect -level recombination: theory and application to anormalous diode characteristics. J Appl Phys. 1995;78:3185. [15] Sah CT. Fundamentals of Solid-State Electronics. Singapore: World Scientific;1992. [16] Queisser HJ. Forward characteristics and efficiencies of silicon solar cells. Solid-State Electronics. 1962

Open access
Assessing the Influence of the Presence of Heavy Metals Adsorbed on Activated Carbon on the Efficiency of Degradation of Phenol Using Selected Oxidizing Agents

References Huang HH, Lu MC, Chen JN, Lee CT. Catalytic decomposition of hydrogen peroxide and 4-chlorophenol in the presence of modified activated carbons. Chemosphere. 2003;51:935-943. Luis A, Lombrañ JI, Varona F, Menéndez A. Kinetic study and hydrogen peroxide consumption of phenolic compounds oxidation by Fenton's reagent. Korean J Chem Eng. 2009;26(1):48-56. Vidic RD, Suidan MT, Sorial GA, Brenner RC. Effect of molecular oxygen on adsorptive capacity and extraction efficiency

Open access
Efficiency of Water Quality Index Approach as an Evaluation Tool

Abstract

This study aimed to demonstrate efficiency of documented index method “universal water quality index-UWQI” to evaluate surface water quality and investigate seasonal and temporal changes, in the case of Gediz River Basin Turkey. UWQI expressed results relative to levels according to criteria specified in European legislation (75-440 EEC). The method produced a unitless number ranging from 1 to 100 and a higher number was indicator of better water quality. Water quality is classified into five classes and index scores between 95-100 represent excellent and lower than 24 represent poor quality. In the study, dissolved oxygen-DO, pH, mercury-Hg, cadmium-Cd, total phosphorus-TP, biochemical oxygen demand- BOD and nitrate nitrogen-NO3-N have been chosen as index determinants. Samples analyzed for these variables were collected from five stations on monthly basis along two years. Based on UWQI classification scheme, water quality at sampling stations had scores below 40 and assigned to “marginal” which is between fair and poor quality class. On the other hand sub-indices of water quality determinants showed seasonal differences for some parameters. Cd concentrations were higher in “high flow” and lower values were observed in “low flow” periods. This was explained by negative impact of urban runoff on water quality. On the other hand DO concentrations were higher in “high flow” period. Under “low flow” conditions water quality at upstream stations (where the industrial density is low) was comparably better than downstream part. The study showed that index approach can be efficient tool to: a) evaluate water quality, b) investigate spatial and seasonal variations and finally, c) extract required information from complex data sets that is understandable by non-technical people.

Open access
The ways to increase efficiency of soil bioremediation

” technologies to gauge microbial communities and bio remediation at xenobiotic/anthropogen contaminated sites. Biores Technol. 2009;101(6):1558-156. DOI: 10.1016/j.biortech.2009.10.080. [9] Kang JW. Removing environmental organic pollutants with bioremediation and phytoremediation. Biotechnol Lett. 2014;36:1129-1139. DOI: 10.1021/es203753b. [10] Simarro R, González N, Bautista LF, Molina MC. Assessment of the efficiency of in situ bioremediation techniques in a creosote polluted soil: Change in bacterial community. J. Hazard Mater. 2013;262:158-167. DOI: 10.1016/j

Open access
Assessment of the Reliability-Cost Efficiency of the Pumping Subsystems at Water Treatment Plant

Abstract

In last years all countries of the European Union experience decrease of water consumption. What is worse, in most cases large European water treatment plants (WTP) have been design and built decades ago, when water consumption was much higher than nowadays. It is a challenging task to adjust WTP’s capacity to the current water demand as it is associated with costs and safety issues. Minding that fact, authors decided to propose an new authorial methodology of combined reliability-cost efficiency assessment for water supply system with exceeded redundant capacity, based on new index - unit indicator of reliability-cost efficiency. It included both reliability and costs aspects. It was decided to present the new method on example of the pumping subsystems working for WTP in Poland. The research was based on Activity-Based Life Cycle Costs (AB-LCC) methodology together with two-parametric reliability evaluation. Using real operational and financial data an application of proposed authorial reliability-cost indicator was presented. The reliability-cost efficiency assessment allowed to present how operation of each pumping subsystem influenced global operational costs of WTP. This information is essential for decision-making process for rational management of technical facilities.

Open access
Influence of Selected Coagulants of Indicator and Dioxin-Like PCB Removal from Drinking Water

Abstract

The aim of the research was to compare selected coagulants efficiency in indicator and chosen dioxin-like PCB removal from surface water. As coagulants, there were used aluminium sulfate and 5 hydrolyzed polyaluminium chlorides, with trade names: PAX-XL1, PAX-XL10, PAX-XL19, PAX-XL60, PAX-XL69. For the research, surface water was used, collected from dam reservoir. The water composition was modified with standard mixtures PCB MIX24 and MIX13, in order to obtain concentration of each congener equal to 300 ng/dm3. The PCB MIX24 mixture was composed of indicator congeners solution: 28, 52, 101, 118, 138, 153, and 180, whereas the MIX13 mixture - solution of three dioxin-like PCB 77, PCB 126, and PCB 169. It was demonstrated that the application of aluminium sulfate allowed for reaching better effects for purifying water of PCB, than with the usage of pre-hydrolyzed salts, polyaluminium chlorides. Out of the studied coagulants, the best effects for indicator PCB removal were obtained with the application of aluminium sulfate, total PCB concentration was decreased by 65%. The highest efficiency for indicator congeners removal (90%) was obtained for PCB 138 and 153. After the application of hydrolyzed polyaluminium chlorides PAX-XL1, PAX-XL10 decrease in higher chlorinated PCB concentration was obtained, in the range of 23 to 74%. Selectivity of chosen PCB congener removal, depending on applied coagulant, was demonstrated; with the usage of aluminium sulfate, removal of heptachlorobiphenyl PCB 180 at the level of 34% was obtained, whereas with the application of PAX-XL1 and PAX-XL10 higher reduction efficiency for this congener was obtained, i.e. 83 and 74% respectively. For dioxin-like PCB, after application of aluminium sulfate, total concentration reduction by 74% was obtained, efficiency of this congeners removal amounted to from 54 (PCB 77) up to 72% (PCB 126), similar results were obtained after the usage of PAX-XL1. The lowest PCB removal from water rate was stated for coagulants PAX-XL60 and PAX-XL69.

Open access
The Possibility of Utilization of Sewage Sludge as a Filler in Production of the Lightweight Aggregate Concrete

References [1] Życzyńska A. Eksploat Niezawodn. 2013; 15(4):458-462. http://ein.org.pl/sites/default/files/2013-04-25.pdf . [2] Ickiewicz I. Ecol Chem Eng S. 2013;20(4):805-816. DOI: 10.2478/eces-2013-0056. [3] Directive 2006/32/EC of the European Parliament and of the Council of 5 April 2006 on energy end-use efficiency and energy services and repealing Council Directive 93/76/EEC.2006. https://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2006:114:0064:0085:EN:PDF . [4] Central Statistical Office. Energy Efficiency in the Years

Open access