حذف رنگ فاضلاب صنايع تخميري از ملاس به روش تالابي با سطح آزاد

COLOR REMOVAL OF MOLASSE EFFLUENT BY WETLAND WITH FREE WATER SURFACE (FWS)

In the recent years, the fermentation industry has expanded both in number of products prepared on a commercial scale and in capacity. The number of products has more than doubled, and the volume has had about fivefold increase. 50000 tons of molasses is being used for production of industrial alcohol in Iran. The effluent of this process has been known as a highly polluted industrial wastewater. The biological treatments can result in pollution abatement but brown color cannot be removed. Therefore a secondary treatment is required. The natural treatment systems like artificial wetlands can be used for solving this problem. This process has been considered in two different areas in Iran. The first place was Parchin where an FWS was and constructed sedges were used as aquatic plant. In the first cultivation, efficiency was approximately 35%. For the second -place Isfahan, two paddies were used. One of them was irrigated with a mixture of water and wastewater (20%) and another one received only pure water as blank. During the experience, duckweed was observed in paddy with wastewater. It was demanstrated that efficiency in the first paddy was 98% but amount of production was 15% less than the blank.