Variation in heavy metal removal by a conventional municipal waste water treatment plant

The objectives of this report are: (a) the study of the mercury contaminated wastewater input effects at the activated sludge process in an activated sludge pilot plant and (b) the estimation of the removal ability of mercury's input, at different concentrations, from the activated sludge pilot plant.The concentration of inorganic mercury at the inlet of the plant varied from 0 to 100 µg/l HgCl 2 . The most important physical, chemical and biological parameters of the pilot plant were measured at least 4 times a day. Consequently, it was possible to describe, in a more detailed way, the effect that mercury's input had on the activated sludge procedure and to point at the most critical fluctuations of mercury's removal ability from the pilot plant.

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Examination of mercury's effects during the process of the activated sludge

Pavlogeorgatos¹,

Lekkas

Georgiou

et al. 1999

Toxicological & Environmental Chemistry

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Fate and Biotransformation of Metal and Metalloid Species in Biological Wastewater Treatment Processes

Stasinakis

Thomaidis

2010

Critical Reviews in Environmental Science and Technology

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Suspended and attached growth wastewater treatment processes are widely used for the removal of biodegradable organic constituents and nutrients from wastewater. The frequent detection of toxic metals and metalloids in wastewater contributed to the publishing of numerous papers in the past, investigating their presence, toxicity and behavior in biological wastewater treatment systems (BWTS). In most of these studies, data were referred to total element concentration. However, nowadays it is generally accepted that toxicological and physicochemical properties are differentiated according to elemental speciation. The literature review revealed that there are enough studies investigating chromium species presence, toxicity, fate and biotransformation in BWTS, whereas there are fewer data for organotin compounds. Even less studies exist for arsenic, mercury and selenium species. Most of the results are referred to the activated sludge process. The biotransformation mechanisms are element-dependent. The reduction of Cr(VI) to Cr(III), the sequential debutylation of tributyltin and triphenyltin to inorganic tin, the oxidation of As(III) to As(V) and their methylation to organoarsenicals have been observed. Despite the gaps in the literature, these preliminary, in many cases, results indicate that biological wastewater treatment processes could be used in the future for the detoxification of metal-and metalloid-laden wastewater, allowing the reuse of wastewater and sludge.

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Variation in heavy metal removal by a conventional municipal waste water treatment plant

Cited by 2 publications

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Examination of mercury's effects during the process of the activated sludge

Examination of mercury's effects during the process of the activated sludge

Fate and Biotransformation of Metal and Metalloid Species in Biological Wastewater Treatment Processes

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