Document Type

Journal Article

Department/Unit

Department of Biology

Title

Degradation of tetracycline and sulfadiazine during continuous thermophilic composting of pig manure and sawdust

Language

English

Abstract

During composting, the thermophilic phase resulted in high degradation of antibiotics in the composting mass; thus temperature is considered as the major factor for degradation of antibiotics. Therefore, to achieve complete removal of antibiotics, the effect of continuous thermophilic composting on the degradation of antibiotics and their effect on antibiotic resistant bacteria in the pig manure were evaluated. Pig manure was mixed with sawdust, spiked with tetracycline (10 and 100 mg/kg) and sulfadiazine (2 and 20 mg/kg) on dry weight (DW) basis and composted at 55°C for six weeks. Based on the organic decomposition, the antibiotics did not affect the composting process significantly, but negatively influenced the bacterial population. Tetracycline clearly exhibited a negative but marginal influence on carbon decomposition at 100 mg/kg level. The bacterial population initially decreased steeply ∼2 logs and slowly increased thereafter. Sulfadiazine and tetracycline resistant bacterial populations were stable/marginally increased after an initial decrease of about 2 or 3-5 logs, respectively. Sulfadiazine was not detectable after three days; whereas, ∼8% of tetracycline was detected after 42 days of composting with a t1/2 of ∼11 days, irrespective of the initial concentration. The presence of tetracycline in the compost after 42 days of thermophilic composting indicates the involvement of a mesophilic microbial-mediated degradation; however, further studies are required to confirm the direct microbial involvement in the degradation of antibiotics. © 2013 Taylor & Francis.

Keywords

antibiotic resistant bacteria, antibiotics, composting, manure, thermophilic

Publication Date

2013

Source Publication Title

Environmental Technology

Volume

34

Issue

16

Start Page

2433

End Page

2441

Publisher

Taylor & Francis

DOI

10.1080/09593330.2013.772644

ISSN (print)

09593330

ISSN (electronic)

1479487X

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