The behavior of Ni(II), Cr(III), and Zn(II) in biological wastewater treatment process

The purpose of this research was to investigate the effects of Ni(II), Cr(III), and Zn(II) on the treatment performance of sequencing batch reactor (SBR) system. The kinetics of adsorption study showed that the pseudo second-order reaction model provided the best description of the data obtained. From the Langmuir isotherm, the maximum adsorption capacities of Ni(II), Cr(III), and Zn(II) were 30 mg/g, 23 mg/g, and 18 mg/g, respectively. Cr(III) and Ni(II) were found to exert a more pronounced inhibitory effect on the bioactivity of the microorganisms compare to Zn(II). The increase of Cr(III) and Ni(II) concentration from 5 to 10 mg/L caused significant effect on the suspended solids (SS) and total organic carbon (TOC) removal efficiency in SBR system but vice versa in the case of Zn(II). The addition of powdered activated carbon (PAC) and termination of metal ions addition into SBR systems were carried out to investigate the capability of system recovery from the toxic effects of metal. Das Verhalten von Ni(II), Cr(III) und Zn(II) bei der biologischen Abwasserbehandlung An einem schubweise beschickten Reaktor (SBR) wurde der Einfluss von Ni(II), Cr(III) und Zn(II) auf die Leistungsfahigkeit der biologischen Abwasserbehandlung untersucht. Untersuchungen zum Sorptionsverhalten der Metalle ergaben, dass die Kinetik der Adsorption am besten durch ein Modell pseudo-zweiter Ordnung beschrieben wird. Aus der Langmuir-Isothermen wurde fur Ni(II), Cr(III) bzw. Zn(II) eine maximale Adsorptionskapazitat von 30 mg/g, 23 mg/g bzw. 18 mg/g erhalten. Cr(III) und Ni(II) wirkten starker hemmend auf die biologische Aktivitat der Mikroorganismen als Zn(II). Eine Konzentrationserhohung von 5 mg/L auf 10 mg/L hatte im Fall von Cr(III) und Ni(II) eine signifikante Verschlechterung der TOC- und der Partikelentfernung zur Folge, fur Zn(II) wurde der gegenteilige Verlauf beobachtet. Es wurde gepruft, inwieweit fur das SBR-System nach Beendigung der Metallionenzugabe oder nach Zugabe von Pulveraktivkohle ein Erholungseffekt festzustellen ist.

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