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Considering the serious shortage of drinking water in Iran and the need to use other sources of water including wastewater, blackwater and saltwater in agriculture, in the present study, the effect of common duckweed (Lemna minor) and filamentous Cyanobacteria Oscillatoria Sp on purification of urban wastewater (Khorasgan University wastewater) and industrial wastewater (Esfahan Sugar Co. wastewater) samples with and without aeration in glass aquariums for 15 days with 5-day gaps in between will be analysed; and the density factors of cadmium, nickel and zinc are measured first for the sample urban and industrial wastewaters and later in each step of the factorial experiment. Then, the data are assessed in SAS using randomised complete block design for factorial experiment in three repetitions and Duncan’s new multiple range test. The results indicate that Cyanobacteria Oscillatoria Sp had the best effect on reducing nickel in industrial wastewater without aeration (between day 10 and 15). Lemna minor was better than Cyanobacteria Oscillatoria Sp in reducing zinc in industrial wastewater (the best performance was from the first 5 days) and after purification, this water will cause no problems in terms of zinc. The treatments did not have predictable behaviour in reducing cadmium but cadmium levels in both types of wastewaters were not so bad as to cause irrigation problems.

international journal of environmental analytical chemistry

An assessment of the effect of Lemna minor, Cyanobacteria Oscillatoria Sp and aeration on the elimination of cadmium, nickel and zinc from urban and industrial wastewater