Research On Membrane Hanging Of Rice Straw-ash Ceramic Fibe In Biological Contact Oxidation

China is a large agricultural nation, yeilding about 180 million tons of rice, and 100～120 million tons of rice straw as well. Most of these rice straw are treated by burning, which leads to not only some environmental pollution, but also resources waste. In addition, there are decades of million tons of ash each year emissioned by China's coal-fired power plants, which takes up much of the land, and pollutes the air, water and soil seriously as well. Fly ash and rice straw being used as raw material through non-sintering and non-autoclave preparation technology, a new packing named rice straw-ash ceramic fiber was prepared. With a low density, high spicific surface, microporous structure and a strong microbial affinity, it owns a stable operation and good effect in applicating in handling biological wastewater in biological contact oxidation.Rice straw-ash ceramic fiber was used in water treatment experiment. In the phase of membrane hanging, COD, Ammonia nitrogen, Total phosphorus, SS, Turbidity and bacteria total were in detection. The results indicated that the treatment effect of the COD, Ammonia nitrogen and Total phosphorus was not good just after hanging membrane, because the water temperature was lower relatively and the bacterial need a long term to adjust at first. But during the treating process, the removal rates of them kept a trend of increasing, amouting to a good effect with a standard effluent finally. As for SS, Turbidity and bacteria total, the removal effects kept well in the phase of membrane hanging, lasting 9 days. success of membrane hanging could be achived when removal rate of COD amount to 80%, and that of ammonia nitrogen to 75%.In sewage treatment experiment by Rice straw-ash ceramic fiber, dominate bacteria in the membrane was obeserved and recorded in biological contact oxidation in the phase of membrane hanging, in order to provide reference for subsequent research. The results indicate that among different dominate bacteria, Epistylis took an obvious advantage, and the order of them judged by microorganism density goes as, Epistylis>Paramecium>Vorticella>Euplotes> wireworm. The emergency of a large amount of Epistylis led to a good treatment effect with a lower effluent COD and turbility. A large amount of epistylis bing fixed in the packing surface showed it was a mature membrane with a high quality. Usually, vorticella would be an dominate bacteria in treating sewage, but it was replaced by epistylis in this study, probably because of large amount of rice straw in the ceramsite. The kinetics modle for matrix degradation of rice straw-ash ceramic fiber in treating urban wastewater in biological contact oxidation goes as followingFigure 32 table 24 reference 80...