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Research article2005Peer reviewed

Removal of micro-organisms in a small-scale hydroponics wastewater treatment system

Ottoson J, Norstrom A, Dalhammar G


Aims: To measure the microbial removal capacity of a small-scale hydroponics wastewater treatment plant. Methods and Results: Paired samples were taken from untreated, partly-treated and treated wastewater and analysed for faecal microbial indicators, i.e. coliforms, Escherichia coli, enterococci, Clostridium perfringens spores and somatic coliphages, by culture based methods. Escherichia coli was never detected in effluent water after >5.8-log removal. Enterococci, coliforms, spores and coliphages were removed by 4.5, 4.1, 2.3 and 2.5 log respectively. Most of the removal (60-87%) took place in the latter part of the system because of settling, normal inactivation (retention time 12.7 d) and sand filtration. Time-dependent log-linear removal was shown for spores (k = -0.17 log d(-1), r(2) = 0.99). Conclusions: Hydroponics wastewater treatment removed micro-organisms satisfactorily. Significance and Impact of the Study: Investigations on the microbial removal capacity of hydroponics have only been performed for bacterial indicators. In this study it has been shown that virus and (oo) cyst process indicators were removed and that hydroponics can be an alternative to conventional wastewater treatment

Published in

Letters in Applied Microbiology
2005, Volume: 40, number: 6, pages: 443-447

    UKÄ Subject classification

    Food Science
    Fish and Aquacultural Science
    Environmental Sciences related to Agriculture and Land-use

    Publication identifier


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