Geochemical characteristics of inorganic sulfur in Shijing River, South China

Abstract

Different inorganic sulfur species distributed in overlying water, pore water and sediment in a heavily polluted river were determined. The concentrations of S 2À and SO 4 2À in the overlying water were much more than those in the pore water. This result perhaps indicates the S 2À was mainly from discharged wastewater, not from sediment resuspension. In the sediments, acid-volatile sulfide, chromium(II)-reducible sulfide, and elemental sulfur were determined by a modified diffusion method. The results indicate that acid-volatile sulfide was the dominant component of the reduced inorganic sulfur, making up about 62% of the total reduced inorganic sulfur.

Geochemistry of reduced inorganic sulfur, reactive iron, and organic carbon in fluvial and marine surface sediment in the Laizhou Bay region, China

“…Berner (1982) indicated that the C/S mass ratio in normal marine sediments (deposited under an oxic water column) was between 0.75 and 1.35 (calculated from molar ratio 2.0-3.6). Research into the distribution and transformations of reduced inorganic sulfur (RIS) in freshwater, estuary, peatland, salt marsh, and marine sediments (Berner 1984;Coulson et al 2005;Bottrell et al 2010;Sheng et al 2011Sheng et al , 2013aMortimer et al 2011) has shown that pyrite and ferrous monosulfide are the two major end products in sediments, where dissimilatory sulfate reduction is active (Zhu et al 2014). Although sulfate and Fe(III) reduction along with the microbially mediated formation of sulfide minerals can increase alkalinity and reduce metal availability (Burton et al 2005;Mortimer et al 2011), oxidation of sedimentary sulfide during sediment resuspension may cause rapid deoxygenation and acidification of overlying water, posing an environmental hazard (Morse and Rickard 2004;Sullivan et al 2002).…”

A combined application of different engineering and biological techniques to remediate a heavily polluted river

“…Aeration led to oxygenation and oxidation, during which S 2− reached nearly zero. In heavily polluted river, the odorous compounds, especially the odorous volatile sulfur containing compounds will be produced and release from anaerobic water bodies (Sheng et al, 2008(Sheng et al, , 2011. In this work, the average final value of DO was ∼3 mg L −1 , the production of reduced sulfide was restrained, so the odorous pollution was decreased.…”

Water quality remediation in a heavily polluted tidal river in Guangzhou, South China

“…Moreover, the task of separating the polluted water from rainwater is also quite complicated. Second, some of these rivers have had a history of pollution problems for over 100 years; there are black and malodorous sediments on the bottoms of some riverbeds exceeding depths of one meter (Sheng et al, 2011). To ultimately remediate the water environment, the question of how to avoid recontamination should first be addressed.…”