Abstract
The main aim of this work was to test in-situ sediment remediation of a polluted river bed by the addition of biologically activated beads. The factors influencing the bioremediation performance were analyzed and compared in four experimental devices (D1: 230 g beads without microbes; D2: 230 g detached microbes (20%); D3: 230 g microbial beads; and D4: 230 g activated carbon and microbes). Device 3 (microbial beads) showed the best pollutant removal performance for NH4+-N: 76.3%, TN: 93.3% and COD: 92.8%, respectively, in the overlying water. The TOC, TN, heterotrophic and sulfide oxidizing bacteria removal rates reached were 61.9%, 58.0%, 45%, and 90%, respectively.
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