Removal of hydrogen sulfide using crushed oyster shell from pore water to remediate organically enriched coastal marine sediments

Abstract

Hydrogen sulfide is highly toxic and fatal to benthic organisms as well as causing depletion of dissolved oxygen and generating blue tide in eutrophic coastal seas. The purposes of this study are to reveal adsorption characteristics of hydrogen sulfide onto crushed oyster shell, and to evaluate removal efficiency of hydrogen sulfide from pore water in organically enriched sediments using container experiment in order to develop a coastal sediment amendment. The crushed oyster shell was mainly composed of CaCO(3) with calcite and CaO crystal phase. The batch experiment showed removal kinetics of hydrogen sulfide can be expressed as the first order equation and Langmuir plot fitted well in describing the adsorption behavior with the adsorption maximum at 12 mg-S g(-1). The container experiments suggested the oyster shell adsorbs hydrogen sulfide in pore water effectively and reduces oxygen consumption in the overlying water. Furthermore, oxidation-reduction potential of the sediment was higher with addition of crushed oyster shell than the control without oyster shell. Thus, it is concluded that crushed oyster shell can be an effective amendment to remediate organically enriched sediments in eutrophic coastal seas.

Isothermal Modelling Based Experimental Study of Dissolved Hydrogen Sulfide Adsorption From Waste Water Using Eggshell Based Activated Carbon

“…In this study, the synthetic waste water was prepared according to the procedure reported by Asaoka et al [18]. A portion of Na 2 S.9H 2 O was dissolved in 500 mL solution of 0.01 M KCl purged with N 2 gas.…”

“…A portion of Na 2 S.9H 2 O was dissolved in 500 mL solution of 0.01 M KCl purged with N 2 gas. Thereafter, the pH of the solution was adjusted to 4.5 -5.5 using 0.2 M HCl [18]. The concentration of dissolved H 2 S in water is 4 -6 g/L [11].…”

“…In addition, study on ferric and alum water treatment residuals has been conducted by Wang and Pei [16]. Possible materials to be used as adsorbents of H 2 S such as Fine Rubber Particle Media (FRPM) and crushed oyster shell have been tested by Wang [17] and Asaoka [18], respectively. Recently, the low-cost carbon-based materials such as agricultural wastes have been used as pollutant adsorbent such as rice husks [19], banana and orange peels [20], coconut shell [21], macadamia nut shells [22], fibers of oil palm empty fruit bunches [23], rice straw [24].…”

Reuse of Waste Shells as a SO2/NOx Removal Sorbent

“…Therefore, new applications utilizing these wasted oyster shells are expected to contribute towards recycling consciousness within the society [Asaoka et al, 2009]. The application of many kinds of waste shells, which have been dried, crushed and calcined, to sorption of acidic gases and nitrogen oxides is not only economically valuable but also very significant in the aspect of waste recycling.…”

“…In Japan, 200,000 tons of oysters were produced in 2007 [Asaoka et al, 2009]. And Table 1 shows oyster production of Korea from 1997 to 2006.…”