Optimization of groundwater sampling approach under various hydrogeological conditions using a numerical simulation model

Qi, Shengqi; Luo, Jian

doi:10.1016/j.jhydrol.2017.07.016

Cited by 20 publications

(15 citation statements)

References 32 publications

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“…Sustainable environmental remediation remains an enormous challenge for modern society (QI et al, 2017;ZHANG et al, 2017). The need to remediate contaminated areas with metals is justified by the possibility of restoring its functionality.…”

Section: Introductionmentioning

confidence: 99%

Coffee Waste Biochar: Characterization and Zinc Adsorption From Aqueous Solution

Sertoli

Carnier

Abreu

et al. 2019

C.Sci.

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The final disposal of organic wastes has become a major challenge with increasing industrialization and population growth. Coffee wastes are examples of this, thus the conversion of these biomasses into biochar through pyrolysis could provide economic and environmental benefits, such as remediation of heavy metal polluted water. Therefore, in this work, biochar produced at 700 °C from spent coffee grounds and coffee parchment were evaluated for Zn removal from aqueous solution. Batch adsorption tests were performed with six Zn concentrations and four replicates for each material. The desorption process was performed sequentially with a pH 4.9 buffer acetic acid solution. Langmuir and Freundlich isotherms were fitted to the adsorption data using non-linear models. Batch adsorption tests showed that the adsorption was strongly dependent on biochar properties. Biochar prepared from coffee parchment was more effective at Zn binding, showing the highest adsorption capacity (0.792 mg g<sup>-1</sup>). Nevertheless, both biochars bounded Zn strongly and the adsorption process was not easily reversed.

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Section: Introductionmentioning

confidence: 99%

Coffee Waste Biochar: Characterization and Zinc Adsorption From Aqueous Solution

Sertoli

Carnier

Abreu

et al. 2019

C.Sci.

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“…Environmental pollution in air, land, and water has been a huge challenge to the modern society (Hou and Li 2017;Qi et al 2017;P. Zhang et al 2017).…”

Section: Introductionmentioning

confidence: 99%

Comparison of nickel adsorption on biochars produced from mixed softwood and Miscanthus straw

Shen

Zhang

Jin

et al. 2018

Environ Sci Pollut Res

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In order to understand the influence of feedstock type on biochar adsorption of heavy metals, the adsorption characteristics of nickel (Ni), copper (Cu) and lead (Pb) onto biochars derived from mixed softwood and Miscanthus straw were compared. The biochars were produced from mixed softwood pellets (SWP) and Miscanthus straw pellets (MSP), at both 550 and 700 °C for each material, using a standardised production procedure recommended by the UK Biochar Research Centre. Kinetics analyses show that the adsorption of Ni to all four biochars reached equilibrium within 5 min. The degree of Ni removal for all four biochars remained nearly constant within initial pH values of 3-8, because the equilibrium pH values within this range were similar due to the buffering effect of the biochars. A sharp increase of Ni removal percentage for all biochars at initial solution pH 8-10 was observed as the equilibrium pH also increased. MSP derived biochars generally had higher maximum adsorption capacities (Q) for the three tested metals as compared with those from SWP, which was likely due to their higher degree of carbonisation during production. This study shows that feedstock type is a primary factor affecting the adsorption capacities of the tested biochars for heavy metals.

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“…In particular, a recent numerical model used to optimize groundwater sampling showed that dissolved oxygen (DO) stabilization is the best indicator of purging process completion and that higher drawdown does not necessarily render lower sampling representativeness [7]. In fact, the above mentioned indicator parameter is the factor which guarantees reaching of drawdown stabilization, with hydraulic conditions which are very close to the natural ones.…”

Section: Introductionmentioning

confidence: 99%

Hydraulic Conductivity Estimation Using Low-Flow Purging Data Elaboration in Contaminated Sites

Filippi

Iacurto

Ferranti

et al. 2020

Water

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Hydrogeological characterization is required when investigating contaminated sites, and hydraulic conductivity is an important parameter that needs to be estimated. Before groundwater sampling, well water level values are measured during low-flow purging to check the correct driving of the activity. However, these data are generally considered only as an indicator of an adequate well purging. In this paper, water levels and purging flow rates were considered to estimate hydraulic conductivity values in an alluvial aquifer, and the obtained results were compared with traditional hydraulic conductivity test results carried on in the same area. To test the applicability of this method, data coming from 59 wells located in the alluvial aquifer of Malagrotta waste disposal site, a large area of 160 ha near Rome, were analyzed and processed. Hydraulic conductivity values were estimated by applying the Dupuit’s hypothesis for steady-state radial flow in an unconfined aquifer, as these are the hydraulic conditions in pumping wells for remediation purposes. This study aims to show that low-flow purging procedures in monitoring wells—carried out before sampling for groundwater characterization—represent an easy and inexpensive method for soil hydraulic conductivity estimation with good feasibility, if correctly carried on.

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Optimization of groundwater sampling approach under various hydrogeological conditions using a numerical simulation model

Cited by 20 publications

References 32 publications

Coffee Waste Biochar: Characterization and Zinc Adsorption From Aqueous Solution

Coffee Waste Biochar: Characterization and Zinc Adsorption From Aqueous Solution

Comparison of nickel adsorption on biochars produced from mixed softwood and Miscanthus straw

Hydraulic Conductivity Estimation Using Low-Flow Purging Data Elaboration in Contaminated Sites

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