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Microbial Enumeration of Different Functional Groups and Bacterial Behavior in Acid Basic Conditions of a Biotoxic Landfill Leachate of Bahía Blanca, Argentina

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Abstract:

Leachate is liquid waste from refuse biological decomposition or rainwater percolation in a landfill. This research focused on leachate produced by a landfill in Bahía Blanca, Buenos Aires, Argentina. The research studied the main microbial populations involved in wastewater treatment, analyzed the behavior of bacteria isolated from leachate at different pH values, and appraised leachate biotoxicity. The number of bacteria varied by type, ranging from 1 × 10 4 to 1 × 10 5 CUF/mL aerobic heterotrophic bacteria (AHB); 1 × 10 3 to 1 × 10 5 CUF/mL anaerobic heterotrophic bacteria (ANHB); 1 × 10 5 to 1 × 10 6 CUF/mL sulfite-reducing bacteria (SRB); 1 × 10 3 to 1 × 10 6 NMP/mL nitrate-reducing bacteria (NRB); and 1 × 10 2 to 1 × 10 4NMP/mL ammonium-oxidizing bacteria (AOB).

Several microbial strains developed at pH 5, 7, and 10. These pH values changed to 9 in the culture media after a 48-hour incubation. Leachate was used to water lettuce seeds ( Lactuca sativa capitata). Its toxicity was proved by full inhibition of plant development.

Keywords: aerobic and anaerobic heterotrophic bacteria; ammonium-oxidizing bacteria; landfill; leachate; nitrate-reducing bacteria; pH, biotoxicity; sulfite-reducing bacteria

Document Type: Research Article

DOI: http://dx.doi.org/10.2175/106143008X370467

Publication date: May 1, 2009

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  • Water Environment Research® (WER®) publishes peer-reviewed research papers, research notes, state-of-the-art and critical reviews on original, fundamental and applied research in all scientific and technical areas related to water quality, pollution control, and management. An annual Literature Review provides a review of published books and articles on water quality topics from the previous year.

    Published as: Sewage Works Journal, 1928 - 1949; Sewage and Industrial Wastes, 1950 - 1959; Journal Water Pollution Control Federation, 1959 - Oct 1989; Research Journal Water Pollution Control Federation, Nov 1989 - 1991; Water Environment Research, 1992 - present.
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