Abstract
Cyanide is one of the toxic materials in the environment and is included as a hazardous waste. One agro-industrial wastewater containing cyanide is from tapioca industry. Various methods, including constructed wetlands, can reduce cyanide compounds in wastewater. Some plants used in wetlands technology include Pistia stratiotes and C. zizanioides, L. This study aimed to analyse the effect of Pistia stratiotes and C. zizanioides, L and media height on cyanide reduction for 15 days. The highest cyanide reduction rate was in the treatment of Pistia stratiotes and C. zizanioides, L with a media ratio of 1:1 and a cyanide concentration of 1 mg/L and in vetiver grass plants with a media ratio of 1:1, 3:1 and 1:3 with cyanide concentration 1 mg/L was 0.1698 mg/L while the lowest rate of cyanide reduction was in the treatment of Pistia stratiotes and vetiver grass and a cyanide concentration of 0.2 mg/L was 0.0627 mg/L.
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