Abstract
Sequencing batch reactor (SBR) system at hydraulic retention time (HRT) of 1.5 days could be used for the treatment of Ladkrabang industrial estate wastewater (LIWW) with high Cr 3+ and Ni 2+ removal efficiencies of 80.7 ± 17.9 and 53.5 ± 25.1%, respectively. Bio-sludge of SBR system with synthetic industrial estate wastewater (SIWW) showed the highest Cr 3+ and Ni 2+ adsorption yields of 36.00 ± 9.80 and 31.59 ± 9.67 mg/g, respectively but they were reduced to 25.20 ± 8.38 and 20.49 ± 7.20 mg/g, respectively with LIWW. Cr 3+ and Ni 2+ strongly suppressed the growth and activity of heterotrophic bacteria. Ni 2+ at 3.0 mg/L did not impact either nitrifying or denitrifying bacteria, while the growth and activity of denitrifying bacteria was suppressed at 3.0 mg/L Cr 3+ . The other advantage of SBR system was that the bio-sludge could adsorb inorganic matters from LIWWs, which contains high inorganic content about 33%. Key words: Adsorption, chromium, heavy metals, nickel, sequencing batch reactor (SBR) system.
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