Study On The Preparation And Application On Water Treatment Of Fiber-Fly Ash Ceramisite

There are about 4.5-5.5 billion tons residual biomass every year in our country such as straw, sawdust et al. Not only polluted the environment, but also resulted in a tremendous waste of resources as most of it been burned.In addition, with the discharge of fly ash being millon ton per year, not only does the large amount of fly ash take up much land including farmland, but also cause environmental pollution to different degrees.This research adopts non-sintering and non-autoclave preparation technology, using fly ash and straw makes fiber-fly ash eramisite which have low density, large surface area and microporous structure and the micro-affinity strong.The eramisite applied to Biological Contact Oxidation Process treat municipal sewage has many special characters,such as, stable operation and high treatment efficiency.Fiber-fly ash eramisite test showed that, by orthogonal test and single factor test, the optimum producing condition and process parameters were determined as following:①Optimum Formula:fly ash 73%,straw 13%,lime 8%, Sodium silicate concentration 1.5%, gypsum 2%, cement 2%, additives 2%.②Curing Conditions: Aging 48 hours at room temperature, and then placed the raw meal ball in water curing 48 hours, remove and naturally dry to dry.As the lightweight agricultural straw added, eramisite specific surface area increased substantially.The physical and chemical properties detection and SEM photograph of Fiber-fly ash eramisite indicate that, eramisite specific surface area is 11.566m2/g which is treble higher than general eramisite, bulk density 0.63g/cm3, total pore volume 0.0627cc.g-1, average pore radius 12.39nm, mud content 2.93%, HCl soluble ratio 1.94%.The experiment of Biological Contact Oxidation Process treat municipal sewage show that the removal rates of COD and NH4+-N attain 95% and 99%respectively when the hydraulic retention time(HRT) is 8-9 hours. When the hydraulic loading was .78～1.56m3/(m2·d), the average removal rates of COD and NH4+-N were 90% and 99%respectively. Under this experiment condition, optimal hydraulic retention time was 8-9h, optimal hydraulic loading was 0.78-1.56m3/(m2·d).When volume loading was less than 10kgCOD/(m3·d),BOD process can bear organic loading impact,and the average COD removal rate was 84%,average concentration of which was 35mg/L.During the long term continual run of the model, the COD of effluent always met the class I of the national wastewater discharge standard (GB 8978-1996). The optimum ammonia loading in this system was less than 0.88kg/(m3·d), ammonia removal rate can up to 97%,and the effluent concentration of ammonia was less than 2mg/L.Comprehensive consideration,when COD and ammonia volume loading were less than 10kgCOD/(m3·d) and 0.88kg/(m3·d) respectively,the BOC process system had ideal treatment effect to municipal wastewater.Studies on dynamic show that, biological contact oxidation process using fiber-fly ash eramisite as biological filter, dynamic model for treating municipal sewage as follows:This achievement will open up new utilization ways for solid waste such as crop straw and fly ash, and realized the environmental management objectives as waste to waste and non-second pollution.Figure 33 table 26 reference 106...