【作者】 钱福国；

【导师】 陈天虎；

【作者基本信息】 合肥工业大学 ， 环境工程， 2008， 硕士

【摘要】 本文以价廉易得的天然沸石矿物为主要材料,添加低密度颗粒材料和粘结剂,与沸石细粉混合、成球、固化,成功制备出粒径约为4-6mm的低密度沸石复合填料,构建了低密度沸石复合填料曝气生物滤池系统。以人工配制低浓度含氨氮模拟水,首先通过静态、动态和再生吸附实验研究了沸石离子交换吸附氨氮的性能。系统考察了进水氨氮浓度、沸石用量、温度、沸石粒径、振荡时间、滤速、水质、再生时间和再生次数对沸石离子交换吸附氨氮的影响。静态实验结果表明,初始浓度为10mg/L、粒径为20～40目,静态吸附容量1.6mmolNH₄⁺/g。动态实验结果表明,滤速为2m/h、停留时间为30min,出水氨氮浓度达到2mg/L以下,每克沸石产水量为0.62L。再生实验结果表明,用500mL浓度为5g/LNaCl溶液作为再生剂,再生时间为1h,一次再生恢复率较好。以人工配制低浓度含氨氮模拟水,以低密度沸石复合材料为填料,构建曝气生物滤池小型试验系统装置,进行了系统低密度沸石沸石复合填料曝气生物滤池脱氮性能研究。主要对曝气生物滤池去除COD、氨氮的效果及其影响因素进行了研究。结果表明:采用粒径大小为4-6mm、颗粒密度1.25g/cm³、颗粒强度大于50N的低密度沸石作为曝气生物滤池填料,影响曝气生物滤池工作性能的主要因素有:气水比、填料层高度、水力负荷及有机负荷等。在气水比1:1-5:1,有机负荷低于3.2kgCOD/m³·d,水力负荷1-3m³/m²h,填料高度20-140cm条件下,COD去除率在63%-90.1%,氨氮去除率在79%-91.6%。曝气生物滤池的反冲洗方式采用气、水联合反冲洗效果较好,滤池冲洗后需要5-6h能恢复到最佳处理状态,即对CODcr的去除率达到70%以上。更多还原

【Abstract】 Main material is considered as cheap easy natural Zeolite in the text.additive low density grain material and adhesive mix,conglobate and solidify Zeolite powder.Compound fillings of low density zeolite that are grain diameter of 4-6mm succeefully are prepared,which constitutes system of biological aerated filter with compound fillings of low density zeolite.Manual work prepares simulation wastewater of low concentration ammonia nitrogen.Many factors such as ammonia nitrogen concentration,clinoptilolite amounts,temperature,clinoptilolite diameter,time,filtration velocity,water quality regenerative time and regenerative times have the influence of ammonia nitrogen removal were investigated by the static、dynastic and regenerative experiments firstly,The results of static experiment show static absorptive capacity of 1.6mmolNH₄⁺/g in terms of initial ammonia nitrogen concentration of 10mg/Land clinoptilolite diameter of 20～40 item.The results of dynastic experiment show open water capacity of percent gram of 0.62L in terms of filtration velocity of 2m/h,retention period of 30min and ammonia nitrogen concentration of open water of 2m/L below.The results of regeneration experiment show the solution concentration of 500mL NaCl is 5g/L as the regeneration reagent of natural clinoptilolite,and the regenerative time is an hour and recovery rate of once regeneration is better.Manual work prepares simulation wastewater of low concentration ammonia nitrogen.In lab-scale experiment,the removal ammonia nitrogen performance of BAF with compound fillings of low density zeolite is studied.The main objects studied here are the disposal efficiencies of COD and ammonia nitrogen which can influence the efficiency.The experiment reaches a conclusion that:When using 4-6mm grain diameter、1.05-1.5mg/L density and high 50N intensity as the media, the factors that can influence the performance of BAF are:the ratio of gas to liquid、the media height、hydraulic load and organic load.The removal rate of COD and NH₄^*-N respectively is 63%-90.1%,79%-91.6%under the conditions of the ratio of gas to liquid of 1∶1-5∶1,organic load of low 3.2 kgCOD/m³·d,hydraulic load of 1-3 m³/m² h and the media height of 20-140cm.The method of backwash using air- water backwashing has many advantages over other methods.After backwashing BAF,goove treatment resumes 5-6h.That is to say COD removal rate is above 70%.更多还原