凹土陶粒滤料理化性能及其在BAF中的应用研究

Physics and chemistry performance of attapulgite filter material and its applications to biological aerated filter

研究了温度对凹土滤料理化性能的影响，及凹土滤料在BAF中的应用情况。试验结果表明：温度为700-800℃时，烧失量为22％左右，强度为178～286N，酸碱溶蚀率分别为3．89％～4．14％和10．22％～0．28％，滤料表面粗糙、孔径发达、物理化学性能稳定。该滤料在BAF中启动快、运行稳定，HRT为2h时，COD、氨氮去除率分别可达83．33％、85．6％。常规范围内不同进水浓度对COD和氨氮去除率影响不大，耐冲击负荷能力较强。

The temperature influence on physical and chemical properties of attapulgite filter material and its application to the BAF have been researched. The results show that when the temperature is 700-800 ℃, loss on ignition about 22%, intensity is 178-286 N, corrosion rates of acid and alkali are 3.89%-4.14% and 0.22%-0.28%, respectively. The filler surface is rough ,aperture is well-developed, and physics and chemistry performance is fine. The start-up of filler material is fast and run steadily in BAF,when HRT is 2 h,COD and NH4^＋-N removing rates are 83.33% and 85.6%,respectively. Different influent concentration in routine range does not have much influence on COD and NH4＋-N removing rates, and BAF has strong anti-shock loading capability.