Analysis of the remediation of coal tar-contaminated groundwater using ex situ remediation

The article describes the remediation of contaminated groundwater during the ex situ remediation of coal tar contamination following the closure of a coking plant in the Moravian-Silesian Region (Czech Republic). The aim of the article is to point out the advantages of ex situ soil remediation via the excavation of the contaminated geological environment combined with thermal desorption, a method of removing contaminants both from soil and groundwater. Its advantage is the absolute qualitative and quantitative control over the contaminated soil with the possibility of precise segmentation into contaminated and non-contaminated soils. Next, all contaminated groundwater may be pumped off upon the construction of sealing walls to control groundwater flows. To excavate the soil, it is necessary to reduce the contaminated groundwater level inside the sealing walls and thus create conditions for the extraction of contaminated soils using standard machinery. In detail, the article describes the removal of the contaminated groundwater and compares the quality of the pumped and inflowing water before and after the remediation. The locality is characteristic of a high horizontal and vertical grain-size heterogeneity of gravel-sand, which led to a varying filtration coefficient affecting the capacities of pumped groundwater quantity during the remediation. At the start of the remediation process, the contaminant levels exceeded the limits by the Czech Environmental Inspectorate several times. The post-remediation monitoring showed that all the contaminant levels were below the limit. Surprisingly, the overall groundwater contamination amounted to 232.86 t of contaminants as non-aqueous phase liquids, and 6872.9 kg of dissolved contaminants. As much as 12,200 t of contaminants were removed from the soil.Web of Science1414art. no. 218

Comparative Study of Selected Municipal Waste Dumps

Cílem této diplomové práce bylo srovnání výsledků laboratorních chemických analýz s ohledem na přírodní poměry u vybraných v podloží nezatěsněných skládek odpadů, které byly dodatečně odborně uzavřeny. Srovnáním výsledků chemických analýz bylo prokázáno, že kvalita podzemních a povrchových vod se po dodatečném odborném uzavření vylepšila a došlo tak k zlepšení životního prostředí. V diplomové práci jsem srovnávala 5 rekultivovaných skládek odpadů, na kterých jsem v létech 2014-2018 realizovala monitoring vod. Jedná se o lokality Luhačovice – Loska, Hulín – Padělky, Koryčany – Liščí, Bystřička – Řehořov a Fryšták – Žabárna. Důležitou součástí diplomové práce bylo také srovnání vývoje legislativních předpisů se zaměřením na limitní koncentrace u vybraných parametrů.The aim of this diploma thesis was comparison of laboratory chemists analyze results with regard to natural proportion in selected underlying rock unsealed disposal, which were professionaly closed afterwards. It was proved, by comparison of chemists analyze results, that the quality of groundwater and surface water improved after professionaly closed afterwards and the natural enviroment got better as well. In this diploma thesis I compared five reclaimed landfills where I did water monitoring during four years 2014-2018 in these locations: Luhačovice – Loska, Hulín – Padělky, Koryčany – Liščí, Bystřička – Řehořov a Fryšták – Žabárna. The comparison of development legislative regulations with focusing on to limit concentration of chosen parameters was important part of this diploma thesis.541 - Katedra geologického inženýrstvívýborn

Soil contamination by tar in the alluvial sediments: case study of the brownfield remediation project in the Czech Republic

The paper aims to analyse the remediation of soils contaminated by black coal tar and other contaminants in relation to risk limits in the different geological environments. The research was implemented as a case study in one of the most expensive remediation projects of contaminated soils in alluvial sediments, in the locality of a former coking plant Karolina in an industrial city of Ostrava in north-east of the Czech Republic. Based on the level of risk, three contaminated geological environments (layers) were selected, which were examined for chemical limits that must be complied with after remediation using ex situ thermal desorption. Around 1.5 million tons (10,720 wagons of 72 m(3) and 14 m) of contaminated soils were dug out, which were subsequently treated ex situ by means of thermal desorption. In total, 12,200 t of contaminants were removed, among which non-polar extractable substances (NPES) amounted to 67.94% (8289 t), benzene to 12.25% (1494 t), naphthalene to 11.27% (1375 t), polycyclic aromatic hydrocarbons (PAH) to 6.43% (784 t), benzo(a)pyrene to 1.11% (135 t), phenol to 0.82% (99 t), arsenic to 0.16% (20 t) and mercury to 0.02% (3 t). The most hazardous in terms of contact with humans was the top layer of quaternary alluvial fine-grained soils (3664 t of removed contaminants, 30% of all contamination-layer I). However, the most contaminated layer was the lowest, permeable layer of quaternary alluvial gravel sediments (7479 t of removed contaminants, 61% of all contamination-layer III). The contamination penetrated into the highly permeable layer due to gravity and could not migrate further due to the abundance of impermeable Miocene grey-blue clay.Web of Science79