Ethanol is the biomass energy the clean fuel can be burned completely. Reduce air pollution, and global warming. Produced from raw materials sourced from agricultural crops can be divided 3 type is the raw materials of sugar from beet sugar (น้ำอ้อย and molasses). Raw starch cassava, potatoes and cereals () and raw materials of by-product from agriculture (sugarcane bagasse, rice straw and corn cob). In the process of ethanol production wastewater, which has caused the BOD and COD height about 40 000-70 000 milligrams per liter,,,, and. 100 000-150 000 mg / L. Respectively, the concentration of nitrogen and phosphate, dark brown to black. Affect the quality and views of the water. The intensity of the light that shines through in the water and the quantity of oxygen diffusion from the air into the water drop. Due to the number of species and biodiversity change. Cannot drop into the public waterways.Color removal is available the whole process of physical, chemical and biological methods, including physical adsorption by activated carbon prepared from. Wood, coconut shell and sawdust, which is the material with high porosity. Have the ability to absorb color. Can get rid of the true color and color appearance effectively. But often cause blockage at the surface of charcoal. And reuse of the high cost Separation membrane with electricity (Electrodialysis). A convenient way to but often crashes slag stick filter. Waste electrical energy. To be cleaned frequently, and has not been popular. The chemical methods, such as the building of ตะกอนและ flocculation by alum, lime and iron compounds. Is another way with high efficiency. But it is happened in large quantity, sludge The need to find a way to bring the sludge to eliminate, or using ozone, which need to control the pressure, pH and temperature in the production of ozone used in the system. Why waste electricity. Affect the organisms in water and biological method was used in the treatment of watercolor, such as dye adsorption with algae, found to be effective in.
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