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Author(s): 

EKANAYAKE L. | OFORI G.

Issue Info: 
  • Year: 

    2000
  • Volume: 

    -
  • Issue: 

    -
  • Pages: 

    0-0
Measures: 
  • Citations: 

    1
  • Views: 

    1450
  • Downloads: 

    0
Keywords: 
Abstract: 

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Writer: 

SOLEIMANI SAMIRA

Issue Info: 
  • Year: 

    2010
  • Volume: 

    0
Measures: 
  • Views: 

    162
  • Downloads: 

    0
Abstract: 

RUBBISH PROBLEM AND ITS REPELLING IS NOTED AS A MAIN ISSUE ALL OVER THE WORLD THAT, UNFORTUNATELY, BECAUSE OF LACK OF PUBLIC CULTURE GROWTH AND EVEN ITS RETRO GRADATION. THIS PROBLEM IS SIGNIFICANT IN DEVELOPING COUNTRIES. AND EVEN IN ITS PART HAS ATTRIBUTED DIVERSE PROBLEMS AND ISSUES TO THE HUMANS ENVIRONMENT, SPECIALLY, THE HEALTH OF CITIZENS.A MONG THE VARIOUS METHODS OF REPELLING, THE BEST AND THE MOST ECONOMICAL METHOD IS RECYCLING, THAT CAUSE REDUCED USE AND WASTING NATURAL SOURCES AND RETURN A PART OF COSTS RELATED TO REPELLING OF THE RUBBISH. REGARDING TO THE OBTAINED EXPERIENCES IN RECYCLE ORGANIZATION, THE BEST METHOD OF RECYCLING WHICH CAN ECONOMICALLY AND ENVIRONMENTALLY BE MOST HELPFUL FOR THE ENVIRONMENT IS RESIDUE SEPARATION METHOD IN PRODUCTION PLACE. IT CAN BE CONSIDERED IN DIFFERENT RESPECTS.BEHBAHAN PROVINCE IS ONE OF THE PROVINCES OF THE KHOOZESTAN CITY, ITS POPULATION IS MORE THAN 100000 PERSONS, WHICH IS CONFRONTED WITH THE RUBBISH REPELLING. IN THIS CITY, THE RUBBISH IS REPELLED AFTER COLLECTING IN ABROAD AREA OF CITY. THE RUBBISH PRODUCTION RATE IN THIS CITY, DAILY IS MORE THAN 100 TON, WHICH WE CAN SAY THAT DAILY, ONE KILOGRAM RUBBISH IS PRODUCED PER PERSON. DRY RUBBISH AMOUNT IN BEHBAHAN PROVINCE WHICH ARE RECYCLABLE IS 20-30% OF TOTAL RUBBISH. THIS INDICATED THAT SEPARABLE material AMOUNT IN PRODUCTION AREA IS CONSIDERABLE AND SHOWS THE IMPORTANCE OF SEPARATION FROM THE SOURCE.MONTHLY, 650 MILLION RIAL IS COSTED FOR COLLECTING RUBBISH, ITS REPELLING AND ITS TRANSPORTATION IN BEHBAHAN PROVINCE.REGARDING TO THE PRODUCTION OF RUBBISH, 100 TON DAILY. THE COST OF COLLECTING AND REPELLING OF ONE KILOGRAM RUBBISH IS ESTIMATED ABOUT 216/6 RIALS. ALSO REGARDING TO THE FACT THAT ABOUT 30TON OF THE RECYCLABLE material IS IN BEHBAHAN PROVINCE, WITH PERFORMING SEPARATION DESIGN, DAILY, THE REPELLING OF 30 TON OF RUBBISH IS PREVENTED AND WE CAN SAVE ABOUT 6500000 RIAL IN COLLECTING UNIT AND TRANSPORTATION AND REPELLING OF THE RUBBISH.

Yearly Impact:   مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Author(s): 

SHAH B.A. | SHAH A.V. | SINGH R.R.

Issue Info: 
  • Year: 

    2009
  • Volume: 

    6
  • Issue: 

    1 (21)
  • Pages: 

    77-90
Measures: 
  • Citations: 

    21
  • Views: 

    726
  • Downloads: 

    355
Abstract: 

Chromium (VI) which exists in many industrial Wastewater is considered highly toxic. The aim of the present investigation was to study the reduction of chromium (VI) to chromium (III) and then removing it with the help of weathered basalt andesite products. Reduction of the chromium (VI) to chromium (III) by hydrazinium sulfate was investigated. The influence of hydronium ion concentration, contact time, hydrazinium sulphate dosage and temperature has been tested in batch runs. The process was found to be acid, temperature and concentration dependent. The suitability of weathered basalt andesite products as a potential sorbent was assessed for the removal of chromium (III) following batch mode of operation. The effect of various parameters such as hydronium ion concentration, shaking time, sorbent dose, initial metal ion concentration and temperature on the removal of chromium (III) from aqueous solution was studied. Thermodynamic parameters (DHo, DSo and DGo) for the sorption process were evaluated. Analysis of sorption obtained results showed that the sorption pattern followed the Freundlich, Langmuir and Dubinin-Kaganer-Radushkevich isotherms. The process follows pseudo second order rate and surface diffusion is identified as the predominating mechanism. The sorption process was shown to be reversible by the recovery of sorbed chromium (III) upon extraction with 0.5 M nitric acid. The sorbent, before and after sorption, was characterized by fourier transform infrared spectrometer, X-ray diffraction, scanning electron microscope, transmision electron microscope and thermogravimetric analyse methodes. An increase in crystallanity after sorption of chromium was observed. An industrial effluent was successfully treated with the same sorbent with convincing results.

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Journal: 

WATER S.A.

Issue Info: 
  • Year: 

    1998
  • Volume: 

    24
  • Issue: 

    3
  • Pages: 

    251-256
Measures: 
  • Citations: 

    1
  • Views: 

    319
  • Downloads: 

    0
Keywords: 
Abstract: 

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Issue Info: 
  • Year: 

    2018
  • Volume: 

    9
  • Issue: 

    4
  • Pages: 

    499-504
Measures: 
  • Citations: 

    0
  • Views: 

    344
  • Downloads: 

    123
Abstract: 

According to the European Cement Association, CEMBUREAU, in 2015, the global cement production was 4. 6 billion tons. Traditional cement production emits approximately 1 ton of CO2per ton of cement, which represents almost 80% of the totalCO2emissions of concrete and approximately 6% of the world’ s emissions. Among supplementary cementitious materials, the use of agro-Waste ash emerges due to its reduced CO2emissions, chloride diffusion, and materials cost, in addition toits greater compressive strength. In Colombia, the disposal of agro-Wastes, such as tobacco Waste, is an environmental andeconomic concern. In this study, ash obtained from tobacco Waste (TWA) was studied as a sustainable partial replacementfor cement in hydraulic concrete. The TWA was reduced to a particle size of less than 75 μ m and was characterized by X-rayflorescence. A central composite design was used to study the influence of the ash replacement percentage of cement andthe water/binder (w/b) ratio on the compressive strength at 28 days. The results show that it is possible to replace 10% of thecement with TWA using a 0. 5 w/b ratio and obtain a 51% higher compressive strength than the control mixture at 28 days. Moreover, the experimental results demonstrated an improvement of 86% in the 7-day compressive strength when TWAwas used.

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Issue Info: 
  • Year: 

    2013
  • Volume: 

    6
Measures: 
  • Views: 

    136
  • Downloads: 

    95
Keywords: 
Abstract: 

RAPID INDUSTRIALIZATION AND URBANIZATION HAVE RESULTED IN THE GENERATION OF LARGE QUANTITIES OF AQUEOUS EFFLUENTS, MANY OF WHICH CONTAIN HIGH LEVELS OF TOXIC POLLUTANTS VARIOUS PHYSICOCHEMICAL AND BIOLOGICAL PROCESSES ARE USUALLY EMPLOYED TO REMOVE POLLUTANTS FROM INDUSTRIAL WasteWATERS BEFORE DISCHARGE INTO THE ENVIRONMENT [1]. IN RECENT YEARS, THE SCREENING OF SORBENTS OF CELLULOSIC ORIGIN, TERMED BIO SORBENTS, HAS CONTINUED TO BE A RELENTLESS EXERCISE, EMBARKED UPON BY ENVIRONMENTAL SCIENTISTS AND ENGINEERS, BECAUSE OF THE INHERENT MERITS THEM POSSES. THEY HAVE BEEN FOUND TO BE ACCESSIBLE, CHEAP, RELIABLE, AND POSSESSING THE ABILITY TO COMPLETE FAVORABLY WITH THE CONVENTIONAL SORBENTS. IT IS OF NOTE THAT CONCERNS OVER THE TASK OF SORBENT REGENERATION AND THE MODE OF HANDLING OF THE PRODUCT OF THE sorption PROCESS (I.E. THE USED SORBENT) HAS ALSO BEEN ALLAYED BY THE FACT THAT SOME OF THIS SORBENTS GOT VERY CHEAP AND NEED NO REGENERATION HENCE THEY CAN END UP AS BIOFUELS [2]. BIO sorption IN ENVIRONMENTAL ENGINEERING IS NOW AN AESTHETIC ATTENTION AND CONSIDERATION IN ALL NATIONS, OWING TO ITS LOW INITIAL COST, SIMPLICITY OF DESIGN, EASE OF OPERATION, INSENSITIVITY TO TOXIC SUBSTANCES AND COMPLETE REMOVAL OF POLLUTANTS EVEN FROM DILUTE SOLUTIONS [3]. IN THIS STUDY, THE BIO sorption OF METHYLENE BLUE (MB) WAS STUDIED IN BATCH MODE USING FOUMANAT TEA Waste (FTW) AS LOW-COST ADSORBENT. IN THIS ATTEMPT, THERE IS A COST-SAVING POTENTIAL GIVEN THAT THERE WAS NO FURTHER MODIFICATION OF FTW (JUST WASHED WITH DISTILLED WATER TO REMOVE DIRT AND COLOR, THEN DRIED IN AN OVEN). EQUILIBRIUM DATA WERE FITTED TO THE LANGMUIR, FREUNDLICH, TEMKIN, SIPS AND REDLICH-PETERSON MODELS. MAXIMUM SATURATED MONOLAYER sorption CAPACITY OF FTW FOR MB WAS 242 MG/G AT 303 K. THE REMOVAL OF MB BY FTW FOLLOWED PSEUDO-SECOND ORDER REACTION KINETICS BASED ON LAGERGREN EQUATIONS. VARIOUS THERMODYNAMIC PARAMETERS, SUCH AS DG°, DH°, DS° AND EA HAVE BEEN CALCULATED. THE FINDINGS OF THIS INVESTIGATION SUGGESTED THAT PHYSICAL sorption PLAYS A ROLE IN CONTROLLING THE sorption. WE INVESTIGATED ADsorption MECHANISM BY FTIR AND SEM TECHNIQUES. FTIR DATA INDICATE THAT MB BINDING MOSTLY AT –OH AND C= O GROUPS OF FTW.

Yearly Impact:   مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Writer: 

Najafi Poorang

Issue Info: 
  • Year: 

    2016
  • Volume: 

    4
Measures: 
  • Views: 

    188
  • Downloads: 

    93
Abstract: 

OUR SOCIAL DUTY IN THE CONSTRUCTION MANAGEMENT LEADS US TO THE ASSURANCE ACHIEVEMENT OF SUSTAINABLE DEVELOPMENT FOR USAGE materialS AND PROCEDURES EMPLOYED DURING THE DESIGN AND CONSTRUCTION. CONTROLLED LOW STRENGTH materialS, PROVIDED SPECIFIC FUNCTIONAL PROPERTIES, ESPECIALLY AS A RELIABLE FILLER AND ALTERNATIVE TO CONVENTIONAL BACKFILL AND COMPACTION METHOD DURING CONSTRUCTION OF INDUSTRIAL PROJECTS. IN THE LAST DECADE, CLSM SHOWED THAT CAN PROVIDE THE CAPABILITY OF BURIED Waste EXCAVATED AND ALSO HAZARDOUS BY PRODUCT materialS. IN ADDITION IT IS OBVIOUS THAT CAN REDUCE THE ENVIRONMENTAL POLLUTION AND DEGRADATION CAUSED BY USAGE Waste material INSTEAD OF NONRENEWABLE RESOURCES. ACCORDING TO THESE PROPERTIES CLSM HAS AN EFFECTIVE ROLE TO IMPROVE THE SUSTAINABILITY. IN THIS RESEARCH, THE CONTROLLED LOW STRENGTH material APPLICATIONS, CAPABILITIES AND ITS SUSTAINABILITY KEY FACTORS STUDIED IN CONSTRUCTION INDUSTRIES. LABORATORY RESEARCH SURVEYED THE POSSIBILITY OF UTILIZE THE EXCAVATED SOIL AS Waste materialS (MARL) IN CLSM MIX DESIGN. THE PROCEDURE FOR UTILIZE THE Waste material ACHIEVED AND SHOWED THE BEST OPTION MIX DESIGN FOR PRODUCING OF CONTROLLED LOW STRENGTH materialS IN HORMOZGAN REGION OF IRAN. ALSO THE RESULTS OF AHP ANALYSIS INDICATED THAT PROPOSED CLSM PROCEDURE IS SUSTAINABLE AS COMPARED TO THE CONVENTIONAL APPROACHES OF EMBANKMENT AND SOIL COMPACTION.

Yearly Impact:   مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Issue Info: 
  • Year: 

    2021
  • Volume: 

    34
  • Issue: 

    3
  • Pages: 

    621-628
Measures: 
  • Citations: 

    0
  • Views: 

    33
  • Downloads: 

    0
Abstract: 

The paper considers the application of Waste sorption material utilization and pumpkin seed husks formed during the extraction of heavy metal ions from aqueous solutions, as a combustible additive to clay mixtures in production of the porous ceramics. In this regard, this study evluates the effects of different amounts (2-8%) of the spent sorption material in the charge composition with changes in the physical and mechanical properties of ceramic samples obtained by firing at temperatures of 950-1050 ° C. One finding is that the combustion of the organic additive is accompanied by the formation of voids and the release of gases with the formation of pores in the ceramic piece. Another finding is that all clay mixtures with a combustible additive allow the production of porous ceramics to meet the requirements for compressive strength, porosity, density, water absorption and linear shrinkage. It is recommended using 4 % of combustive additive in order to obtain optimal properties in terms of density and strength. During the testing of the developed porous ceramics for heavy metal leaching, the material does not pose an environmental hazard. Finally, the results of this study are applicable for the construction of internal partitions and household buildings.

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Issue Info: 
  • Year: 

    2016
  • Volume: 

    13
  • Issue: 

    2
  • Pages: 

    0-0
Measures: 
  • Citations: 

    0
  • Views: 

    270
  • Downloads: 

    0
Abstract: 

Atrazine organic pollutant has been found in several water resources of the world. It is highly toxic and carcinogenic in nature. Atrazine is removed by adsorption on iron composite nanoparticles. The composite nanoparticles were synthesized, analyzed and applied for atrazine uptake from water. Residual atrazine was monitored by gas chromatography–mass spectrometry. The maximum atrazine removal (95 %) was achieved using contact time 30.0 min, concentration 30.0 µg/L, pH 7.0, dose 2.5 g/L and temperature 20.0oC. The adsorbent was selective for atrazine adsorption. The results obeyed Langmuir, Freundlich, Temkin and Dubinin-Radushkevich isotherms. DGo values were -6.05, -6.11 and -6.15 kJ/mol at 20, 25 and 30oC temperatures, respectively. The value of DSo was -2.45 × 10-3 kJ/mol K. It showed decline in entropy of atrazine uptake. The adsorption followed pseudo-second-order kinetics. The adsorption mechanism was liquid film diffusion. The proposed adsorption method is inexpensive, fast and reproducible. It can be used to remove atrazine from any water sample/source.

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Author(s): 

AHMAD RAIS | KUMAR RAJEEV

Issue Info: 
  • Year: 

    2008
  • Volume: 

    1
  • Issue: 

    2
  • Pages: 

    85-94
Measures: 
  • Citations: 

    0
  • Views: 

    389
  • Downloads: 

    174
Abstract: 

Ginger Waste material (GWM) has been utilized as adsorbent for removal of hazardous Patent Blue VF (PBVF) dye from aqueous solution. Batch adsorption experiments were performed as a function of pH, contact time, dye concentration, adsorbent dose and temperature.The optimum pH required for the maximum adsorption was found to be 2. The experimental e quilibrium adsorption data were tested using Langmuir and Freundlich isotherm equations and maximum monolayer adsorption capacity was found to be 9.56 mg/g. Adsorption kinetics data were modeled using the pseudo first order and pseudo second order kinetic equations and intraparticle diffusion model. Results indicate that pseudo second order model best describe adsorption kinetics data.

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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