Research On Experimental Of Treating Domestic Sewage By Bio-iron Filling Process

With the development of modern industry and the improvement of people's living , organic concentrations of domestic sewage become higher and the compositions become more complicated. Because the pollutant concentration of influent exceeds the design, the pollutant concentration of effluent exceeds standard discharge. Strengthening the traditional activated sludge process becomes a research focus. Sponge iron as a micro-electrolysis material has attracted more and more attention. Sponge iron taken into the traditional activated sludge process comes bio-iron filling process. The effect of bio-iron filling process treating sewage was researched through comparing the traditional activated sludge process with the sponge iron process.The results showed that bio-iron filling process was an effective treatment process of municipal wastewater treatment and had a stronger resistance to impact load. The process had a great capability to remove organic compounds, ammonia nitrogen, inorganic phosphorus. The removal rate is respectively 92.4%, 96.3% and 89.4%. The sludge of the settling property was excellent. The optimal operating condition of bio-iron filling process was that the concentration of organic compounds, ammonia nitrogen, inorganic phosphorus is respectively 300, 30 and 5mg/L.The removal of removal organic compounds, nitrogen and phosphorus were effected by the concentration of organic compounds, ammonia nitrogen, inorganic phosphorus. The results showed that the COD removal rate increased when the COD and ammonia nitrogen loading increased, the COD removal rate kept invariant when inorganic phosphorus loading increased, the denitrification rate increased when the COD and ammonia nitrogen loading increased, the denitrification rate kept invariant when inorganic phosphorus loading increased, the phosphorus removal rate increased when the COD and inorganic phosphorus loading increased, the phosphorus removal rate decreased when ammonia nitrogen loading increased.The bio-iron filling process had higher treatment efficiency and good results when temperature and load exchanging greatly. The effluent concentration was lower and the treatment time was shorter. The process can be used for transformation of municipal wastewater treatment plant. When the effluent concentration kept invariant, it can save treatment time and decrease volume of the reactor. When the volume of reactor kept invariant, the treatment ability was improved or the amount of inlet water was increased. These researches will give theoretical references for design and operation of the engineering. The experiment proved that bio-iron filling process can treat actual domestic wastewater effectly.