Abstract
Both resting (living) and autoclaved (dead) bio-sludges showed almost the same Cu 2+ and Zn 2+ adsorption capacities with synthetic industrial estate wastewater (SIEWW). The resting bio-sludge showed not only Cu 2+ and Zn 2+ adsorption abilities but also organic matter adsorption ability. But, the organic matter (COD and BOD 5) adsorption ability of bio-sludge with SIEWW containing 60 mg/L Cu 2+ was about half of that with SIEWW containing 60 mg/L Zn 2+. The adsorbed Cu 2+ and Zn 2+ were easily eluted (70–75%) from bio-sludge with 0.1 N HNO 3 and 0.1 M EDTA solutions. Bio-sludge from a wastewater treatment plant could be used as an adsorbent for metal ions (Cu 2+ and Zn 2+). Cu 2+ and Zn 2+ could repress the SBR system efficiency but its efficiency could be increased with the increase of mixed liquor suspended solids (MLSS), and Cu 2+ had more effect than Zn 2+ to repress the system efficiency. The SBR system showed very low removal efficiencies of the pollutants with industrial estate wastewater (IEWW), but its pollutant removal efficiencies with IEWW could be increased with the addition of glucose. The Zn 2+, Cu 2+, BOD 5, COD and TKN removal efficiencies of the system with IEWW containing 1.27 g/L glucose, 10 mg/L Cu 2+ and 10 mg/L Zn 2+ under MLSS of 4500 mg/L were 92.61 ± 0.28%, 83.77 ± 0.93%, 98 ± 0%, 92 ± 0% and 78.1 ± 0.1%, respectively.
Published Version
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