The response of the duckweed Lemna paucicostata exposed to effluent from the UV/H₂O₂ treatment

College

Gokongwei College of Engineering

Department/Unit

Chemical Engineering

Document Type

Conference Proceeding

Source Title

Proceedings of the Seventh OU-DLSU Academic Research Workshop

First Page

138

Last Page

141

Publication Date

2006

Abstract

The Asian Regional Research Programme on Environmental Technology Phase II - De La Salle University (ARRPET II - DLSU) has developed a sequential chemical-biological treatment for PCBs in water. The chemical process is carried out using the UV /H2O2 syster while the biological process involves a three-phase fluidized bed reactor utilizing the biodegrading capacity of biofilm. The effluent from the first phase of the treatment may contain unknown chemical compounds produced as a result of the UV /H202 treatment. The toxicity of the effluent was examined using the duckweed Lemna paucicostata, with (a) duckweed growth in terms of frond count, (b) chlorophyll content and (c) peroxidase activity as endpoints. Results showed that the median effective concentration (ECo) varies depending on the particular batch of effluent tested and the test endpoint analyzed. The ECso ranged from 36.03% - 73.89%, while the No Observable Adverse Effect Concentration (NOAEC) and the Lowest Observable Adverse Effect Concentration (LOAEC) ranged from 20% - 40% and 40% - 100%, respectively.

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Disciplines

Environmental Sciences

Keywords

Polychlorinated biphenyls; Toxicity testing; Lemna paucicostata

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