A nature-based solution to remove hydrogen sulphide

Student thesis: Master Thesis and HD Thesis

  • Nanna Hong Vestergaard
This paper set out to determine the effectiveness of NBS inspired H2S removal from the sewer system, wherefore three different experiments were carried out. The first experi- ment investigated the stripping of H2S by the utilisation of a drop structure installed at Tranbjerg pumping station. The investigation found an average stripping of H2S between 56 % and 69 %. The second experiment focused on biofiltration of the stripped H2S by employing a seashell-based biofilter. The biofilter plant was also installed at Tranbjerg pumping station, and it was shown to remove archive a removal efficiency of 100 %. The third experiment compared six different biofilter materials in an external pilot study. The study focused on concrete, limestone pellets, lava rocks, organic soil as well as whole and crushed seashells. The biofilter materials were exposed to different gas and water concen- trations. The concrete achieved removal efficiencies between 43 % and 94 %, where the limestone pellets achieved removal efficiencies between 83 % and 96 %. The lava rocks achieved removal efficiencies between 32 % and 75 % and the organic soil achieved removal efficiencies between 43 % and 56 %. The whole seashells achieved removal efficiencies be- tween 84 % and 93 %. The crushed seashells achieved removal efficiencies between 83 % and 96 %. In addition, a WATS model was employed to simulate the amount of chemical needed to suppress the formation of dissolved S2−. The chemicals chosen was the NO3−N and Fe2+, and it was estimated that 1 g · s−1 would be sufficient. When the chemical dosing was compared to the biofiltration plant at Tranbjerg pumping station, the expenses associated with chemicals could be considered cost-intensive.
SpecialisationEnvironmental Processes
Publication date28 Apr 2023
Number of pages92
External collaboratorEnvidan A/S
no name vbn@aub.aau.dk
ID: 524568141