FEASIBTY STUDY OF WATER HYACINTH IN TREATMENT OF HEXAMINE WASTEWATERRokhsareh Akbarzadeh and Mitra Kami Delivand
Hexamine wastewater contains substantial pollution loads in terms of organic and inorganic compounds. Phytoremediation used for pollutants by aquatic macrophytes treatment systems is a well established environmental protective technique. A lab scale study was conducted to test the feasibility of water hyacinth for treating of: 1. Hexamine wastewater 2. Formalin removal of wastewater and 3. Removal of detoxified formalin. The pH changed from alkaline to nearly neutral in 2 cases: initial wastewater and detoxified formaldehyde (sodium formaldehyde), but in case of formalin pH remained almost constant up to loading rate of 300 mg/L of the solution, and then it drastically fell. This study reports the results of removal of chemical organic matter and nitrogen compounds from synthetic wastewater. The concentration of synthetic wastewater in the inlet varied from 1 % to 50%. The maximum reduction in the COD mean reduction of initial wastewater, formalin and detoxified formalin were 55.1%, 54.1% and 34.3%, respectively; while the formaldehyde reduction in initial wastewater and formalin solution were 89.4% and 87.9%, respectively. A significant reduction of formaldehyde was noted in all the different concentrations of formalin solution and synthetic wastewater. Water hyacinth has significant potential to absorb methanol from the hexamine wastewater as the results of this study. Thus water hyacinth can be an efficient biological agent in reducing the pollution loads in hexamine wastewater.
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