Tvarus medžio vaidmuo aplinkos apsaugos technologijose

Baltrėnaitė, Edita; Baltrėnas, Pranas; Lietuvninkas, Arvydas

doi:10.20334/2377-m

Cited by 4 publications

(2 citation statements)

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“…Properties of wood, that can influence the adsorption of metals, include lignin, water content, mineral composition, morphology and pore structure. In comparison to the other types of waste, the woody feedstock results in higher yield of biochar due to higher lignin content (Baltrėnaitė et al 2016b(Baltrėnaitė et al , 2016c.…”

Section: Introductionmentioning

confidence: 99%

Effect of Modification with FeCl3 and MgCl2 on Adsorption Characteristics of Woody Biochar

Chemerys

Baltrėnaitė²

2017

Proccedings of 10th International Conference "Environmental Engineering"

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Abstract. Due to high specific surface area, well-developed porous structure and surface functionality biochar has a potential for being used as low-cost adsorbent for adsorption of organic and inorganic contaminants from aqueous solutions. Higher adsorption capacity and selectivity for metals could be further developed after modification of properties of biochar through physical ("designed biochar") and chemical ("engineered biochar") modification techniques. Wood waste of three types [aspen (Populus tremula L.), pine (Pinus sylvestris L.) and fir (Picea abies L.)] were selected to produce the biochar under slow pyrolysis conditions at 450 °C for 2 h with the heating rate of 10 °C/min. Mg and Fe-particles, acting as potential sorption sites for adsorption of metals, were added into the biochar through modification of the biochar with metal salts MgCl2 and FeCl3. The aim of the study was to investigate the effect of chemical modifications of woody biochar with MgCl2 and FeCl3 on the adsorption characteristics of the biochar. The engineered biochar with improved physico-chemical and sorptive properties was evaluated as potential adsorbent of metals from aqueous solutions. Such characteristics of the biochar, as density, porosity, pH, cation exchange capacity, electrical conductivity, moisture content, ash content, water holding capacity, total organic carbon were analyzed. Modifications followed by increasing of moisture and ash content. While carrying out the future adsorption experiment, significantly decreased pH and electrical conductivity of the engineered biochar should be taken into account. Increased cation exchange capacity of the engineered biochar promotes enhanced adsorption of metals.

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Section: Introductionmentioning

confidence: 99%

Effect of Modification with FeCl3 and MgCl2 on Adsorption Characteristics of Woody Biochar

Chemerys

Baltrėnaitė²

2017

Proccedings of 10th International Conference "Environmental Engineering"

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“…It was noted that removal efficiencies of Pb and Cd by oak bark biochar are comparable to that of commercial activated carbon, and biochar produced from wood can effectively adsorb Cu and Zn in aqueous solutions (Inyang et al 2016). Properties of wood, that can influence the adsorption of PTEs, include lignin, water content, mineral composition, morphology and pore structure (Baltrėnaitė et al 2016b(Baltrėnaitė et al , 2016c.…”

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confidence: 99%

Pine-derived Biochar as Option for Adsorption of Сu, Zn, Cr, Pb, Ni and Decreasing of BOD5 in Landfill Leachate

Chemerys

Baltrėnaitė

2017

Science - Future of Lithuania

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Abstract. Landfill leachate is a highly toxic and hazardous form of wastewater due to its complex composition characteristics, e.g. ammonia, metals, organic compounds. Landfill leachate treatment technologies, such as flotation, coagulation/flocculation, precipitation, oxidation, micro-, ultra-, nanofiltration, reverse osmosis, are too expensive, because they require frequent regeneration of the media or generate secondary brine wastes that may pose a disposal problem. In the present study removal of Zn, Ni, Cr, Pb, Cu from Kazokiškės landfill leachate was studied. Kazokiškės landfill is the main site for disposal of Vilnius region municipal wastes. Operator of the landfill is interested in the alternative ways for the primary treatment of the landfill leachate for reducing the load on the expensive reverse osmosis. One of the proposed options for the primary landfill leachate treatment was adsorption by biochar. Due to the high specific surface area, well-developed porous structure and surface functionality biochar has been used as low-cost adsorbent for adsorption of PTEs from aqueous solutions. Biochar was produced from Scots pine (Pinus sylvestris L.) trunk wood (after debarking) by pyrolysis at the highest heating temperature of 700 °C for 45 min in the low-oxygen environment. Laboratory analysis showed that PTEs, such as Zn, Ni, Cr, Pb, Cu, were present in the landfill leachate before water treatment plant. Thus, the aim of the study was to evaluate PTEs (Zn, Ni, Cr, Pb, Cu) removal efficiency by adsorption by pine-derived biochar. Factors, affecting adsorption efficiency, such as biochar particle size (1, 2.5, 4, 5 mm) and dosage of the biochar (1. 01, 3.5, 6.05, 9.45, 13.25, 17.82 g/100 ml of leachate) were studied. Effects of the biochar on pH of the landfill leachate, BOD 5 , PTEs adsorption were analyzed. The findings showed that optimal parameters for decreasing of BOD 5 and retention of Cr and Pb were particle size 1 mm and dosage 6.05 g/100 ml of leachate and 1 mm and more than 13.25 g/100 ml of leachate, respectively. No positive effect on Cu and Zn was observed.

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Influence of Intrinsic Properties of Lignocellulosic Feedstock on Adsorptive Properties of Biochar

Chemerys

Baltrėnaitė

2018

J. Environ. Eng.

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Tvarus medžio vaidmuo aplinkos apsaugos technologijose

Cited by 4 publications

References 284 publications

Effect of Modification with FeCl3 and MgCl2 on Adsorption Characteristics of Woody Biochar

Effect of Modification with FeCl3 and MgCl2 on Adsorption Characteristics of Woody Biochar

Pine-derived Biochar as Option for Adsorption of Сu, Zn, Cr, Pb, Ni and Decreasing of BOD5 in Landfill Leachate

Influence of Intrinsic Properties of Lignocellulosic Feedstock on Adsorptive Properties of Biochar

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