In this paper, the character of structural changes induced by different mechanical treatments to Prunus persica stones (PSs), and its subsequent effect on biosorption kinetics Cu(II) were investigated. PSs processed in vibratory disk mill (PS-V) ultra-centrifugal (PS-C) characterized XRD, BET, SEM FTIR spectroscopy. It was shown that PS-V smaller more reactive with less crystallinity index hydrogen bond intensity compared PS-C. opposite, surface area PS-C bigger than PS-V. The total pore...

The aim of this work was the experimental investigation particle friction factor for air flow through packed bed particles at ambient and elevated temperatures. experiments were performed by measuring pressure drop across bed, heated to desired temperature hot air. Glass spherical seven different diameters used. range flowing from 20?C 350?C voidages 0.3574 0.4303. obtained results correlated using a number available literature correlations. overall best fit all data Ergun [1] equation, with...

In this work, mineral apatite was investigated for the remediation of lead contamination. Two different minerals were used: synthetic apatite, Ca10(PO4)6(OH)2 (hereafter denoted as HAP) and natural from Lisina, near Bosilegrad, Serbia LA). Phosphate ore Lisina deposit consists 43.3 % in form fluorapatite, Ca10(PO4)6(F)2. Sorption properties HAP LA investigated. The results show that both these are effective removal water solution. capacity obtained experiment is 0.216 mmol Pb/g HAP, while...

Biogas represents a promising source for the production of clean energy. The objective this paper was to quantify potential reduction emissions environment during electricity from biogas in comparison with environmental effects same amount fossil resources (coal Kolubara basin and natural gas). Basis impacts work annual plants total capacity 80 MW. This study has shown that power MW results in: substitution up 840 kt coal 123.2 million m3 gas; greenhouse gases range 491.16 - 604.97 CO2-eq,...

The aim of this paper was to present the energy flows in life cycle biogas utilization systems (cogeneration and transportation), as well their mutual relations, starting from providing feedstock for digestion through end-of-life management system fertilizer on agricultural land. This study carried out analysis two scenarios (biogas cogeneration transportation) using performance Mirotin plant (1 MW) Serbia. Results obtained have shown that analyzed scenario positive balances (52,114 53,585...

Several approaches for immobilization of arsenic (As) based on the transformation its soluble forms (compounds) into highly insoluble arsenate apatite Ca5(AsO4)3OH have been proposed. These techniques are successfully applied in treatment industrial waste containing As. Quite contrary, soil contaminated with As by amendments, instead this toxic element, increases mobility and bioavailability. The mechanism underlying these opposite effects still remains elusive. Here, stability analysis...

The aim of this study is to analyze the possibility achieving goal related share biogas energy in final consumption Republic Serbia up 2030 which refers reach 2% electricity produced from biogas, 1% transport and heat accordance with recommendations European Biomass Association (AEBIOM). analysis was performed on basis estimated potential, where crops dedicated production, animal husbandry, municipal solid waste, waste meat industry dairy wastewater as well Serbian development strategy until 2030.

<p>The experimental values of the friction factor (fp) at ambient and elevated temperatures as well heat transfer coefficient (hp) were used to establish analogy between momentum in gas-solid packed beds monosized spherical glass particles, jH=fp/22 or jHε=fp/50. Also, Chilton-Colburn type momentum-mass was confirmed. These findings are valid for range modified Reynolds number Re’p≈20-130. The experiments related fp performed by...

The aim of this work was the experimental evaluation different friction factor correlations for water flow through packed beds spherical and non-spherical particles at ambient temperature. experiments were performed by measuring pressure drop across bed. Packed made monosized glass seven diameters used, as well 16 fractions quartz filtration sand obtained sieving (polydisperse particles). range bed voidages 0.359?0.486, while particle Reynolds numbers from 0.3 to 286 0.1 50 particles....

In this paper the influence of process parameters on material hold-up in a fluidized bed dryer with inert particles was investigated. The experiments were performed pilot-scale cylindrical column 0.215 m diameter and 1.2 height, glass spheres diameters dp = 1.20 mm 1.94 as particles. used for drying NaHCO3 slurry two different concentrations, 10 20 wt.%. Dynamics determined four temperatures, range from 60 to 120?C by taking samples coated during measuring mass without film. obtained results...

In this work, a two-stage packed bed scrubber was designed and optimized for purification of industrial waste gas containing ammonia at concentration 1400 mg m-3. Basic material balance equations, equilibrium data, the generalized pressure drop correlation were used calculation. For analysis different configurations, Katmar software utilized, which uses in order to calculate diameter based on allowable proximity flooding conditions. It found that optimal results are achieved device, using 70...