Abstract
A biological treatment process using a biomass carrier of blast-furnace slag was studied to treat waste water from leather industry, which contains refractry organic compounds. Waste water from leather industry contains NH4-N of 150mg·l-1 and refractry organic compounds, which makes longer HRT of an aeration tank and easily generates NO2-N to induce COD.
The two step biological treatment process, which consists of an activated sludge process using blast-furnace slag as a biomass carrier and a fixed bed reactor using saddle-type ceramics made from blast-furnace slag, was examined to treat waste water from leather industry efficiently.
Nitrifying bacteria of Nitrobacter oxidizing NO2-N to NO3-N could be cultivated on the surface of the ceramics, which protected the accumlation of NO2-N in the effluent and restrained COD originated from NO2-N. And this process could promote the biological oxidation of the organic compounds simultaneously. Thus this process could improve the effluent quality and the treatment efficiency of waste water from leather industry.
