Anoxic Iron Sulfides Formation: A Novel Approach for Iron Removal in Groundwater Treatment

Groundwater (GW) makes up roughly half of the global drinking water supply. Conventional iron removal in GW treatment produces approximately 10,000t/d of iron sludge. Iron sludge consists of low-density flocs with low to no commercial value and causes frequent energy intensive backwashing of the rapid sand filter. This study aimed to explore the...

A critical review of arsenic occurrence, fate and transport in natural and modified groundwater systems in The Netherlands

Arsenic is a common trace element in groundwater and its fate and transport are controlled by combination of (i) natural processes, including redox conditions, salinity and pH, (ii) sedimentary and geochemical environment, and (iii) anthropogenic influences such as groundwater extraction, managed aquifer recharge (MAR), Aquifer Thermal Energy...

Electrochemical reactions between iron sulfide minerals and their implications for concrete durability

It is well known that iron sulphides such as pyrite (FeS2) and pyrrhotite ((Fe1-xS, 0-x-0.125) are unstable in presence of oxygen and moisture, oxidizing to produce sulfuric acid and iron sulphate. Further reactions in concrete cause the formation of expansive reaction products such as ettringite and thaumasite, potentially leading to structural...

Use of mine waste for H₂O₂-assisted heterogeneous Fenton-like degradation of tetracycline by natural pyrite nanoparticles: Catalyst characterization, degradation mechanism, operational parameters and cytotoxicity assessment

Degradation of tetracycline (TTC) with a heterogeneous Fenton-like pyrite/H₂O₂ process by pyrite from mine waste as a mineral catalyst was investigated. The study focused on identifying the main oxidizing agents and degradation mechanisms along with operational variables including solution pH, pyrite and H₂O...

Carbon, iron and sulphur cycling in the sediments of a Mediterranean lagoon (Ghar El Melh, Tunisia)

Coastal lagoon sediments are important for the biogeochemical carbon cycle at the land-ocean transition, as they form hotspots for organic carbon burial, as well as potential sites for authigenic carbonate formation. Here, we employ an early diagenetic model to quantify the coupled redox cycling of carbon, iron and sulphur in the sediments...

Relative contributions of biological and chemical reactions to the overall rate of pyrite oxidation at temperatures between 30C and 70C

Feasibility of a Dutch process for microbial desulphurization of coal

A Dutch feasibility study on microbial coal desulfurization