2 research outputs found
Adsorptive removal of direct black 22 dye using pumice and scoria from aqueous solution and wastewater
No full textA textile industry releases large amounts of dying chemicals, which create severe water
pollution when discharged untreated. Most of these dyes, because of their carcinogenic and
mutagenic properties, they threaten human health and aquatic life. Adsorptive-based
experiment was employed to investigate direct black 22-dye removal capacity of pumice and
scoria from aqueous solution and textile wastewater.
Preliminary test were conducted to optimize parameters. Optimum parameters of pH 4 and 5,
adsorbent dose of 1.6g and 2g, contact time 90 min and 120 minutes, agitation time 30 min at
shaking speed of 200 rpm and room temperature (22±1) were used to investigate the
adsorption capacity using pumice and scoria respectively.
Results of the study revealed that 50 mg/L direct black 22 dye ion concentrations reduced to
2.45mg/L and 3.1mg/L from aqueous solutions using pumice and scoria respectively. When
compared to Nitrate and Fluoride, Phosphate, sulfate and chloride anions were the dominant
interfering anions to compete direct black 22-dye tested in synthetic sample. Chloride was the
dominant anion (973mg/L) found in wastewater analyzed for the experiment.
The equilibrium data best fit to Langmuir and Freundlich adsorption isotherm with a
maximum adsorption capacity of 7.71mg/g and 8.1 mg/g with correlation coefficient R2
(0.995 and 0.9899) using pumice and scoria respectively.
Direct black 22 dye uptake model well fitted with pseudo-second order with correlation
coefficient R2
(0.988 and 0.993) using pumice and scoria respectively.
The results of the study demonstrate that naturally available pumice and scoria can remove
direct black 22 dyes from aqueous solution and it is better to remove the major interfering
anions and mixture of cofactors with suitable pretreatment techniques for real or wastewater
sample before adsorption to reduce the interfering ions competing with direct black 22 dye
Evaluation of LCA Tools for Road Construction and Operation Purposes : A Case Study in Nordic Europe
No full textPublisher Copyright: © The Author(s), under exclusive license to Springer Nature Switzerland AG 2024.Numerous life cycle assessment (LCA) tools for roads are available in Finland and the Nordic countries. These are distinct in aspects such as the LCA stages and standards they are based on, ultimately limiting their capabilities to comprehensively perform an LCA encompassing the use stage. Despite the prevailing differences, adequate studies have yet to be performed to assess and compare these tools. This research evaluated the possibility of combining two LCA tools, ZEROInfra and FuelSave, developed for road construction and operating purposes, respectively, and used by Ramboll Finland Oy, a major consultant in Finland. Additional LCA tools, such as VegLCA from Norway and Klimatkalkyl from Sweden, are incorporated to compare the emission estimations for the product and construction stages of LCA. With the same system boundary, the results showed that emissions estimated by ZEROInfra, Klimatkalkyl, and VegLCA were equivalent, reporting results between 2.4 to 2.5 kt of CO2 eq. However, the environmental impact of each component work item varied due to the differences in aspects such as material property and equipment assumptions by each tool and the aggregation of work items to fit into the input features of the tools. The operation stage of LCA from vehicles was estimated by FuelSave, which resulted in 124 kt of CO2 for 20 years, showing that the dominant contribution to the environmental impact originates from this stage of LCA.Peer reviewe
