A study on Functionalization of Sintered Secondary Sewage Sludge to eliminate NOx

[[abstract]]現今活性污泥系統是目前最普遍及有效的廢水處理方式之一，而其處理過程將產生大量廢棄污泥，又因污水下水道普及率使污水處理量隨之上升，進而引發後續污泥處理問題。近年來政府更是積極投入污水下水道建設工程，提升用戶接管普及率，到2009年的污泥統計量已達每日產生40萬立方公尺的污泥量。所需改善的環境問題刻不容緩。而現今石化工業的蓬勃發展和汽機車的廢氣排放使空氣中氮氧化物濃度過高造成空氣污染，氮氧化物大量排放暴露到大氣中，會與臭氧等氣體發生光化學反應，產生光化學煙霧會引起眼睛不適、頭痛及嘔吐和人體呼吸道疾病；又會與水蒸氣凝結，降到地面形成酸雨，影響的層面相當的廣而且嚴重。現今污泥燒結後用途大多於填充粒料、級配等，雖有資源化，但利用價值不高，本研究應用燒結污泥之最佳成型條件，添加功能性物質二氧化鈦、二氧化錳與燒結污泥結合，污泥燒結物塗佈TiO2並以紫外光照射下具有轉換NOx之效能，此實驗得到最佳的NOx轉化效率為25%，其條件為填充率50%、TiO2塗佈、NOx濃度15ppm、氣體流速0 5L/min、30℃、相對濕度80%、紫外光365nm 20watt。[[abstract]]The Activated sludge is one of the most common and effective process for sewage treatment today However this process leaves a large amount of surplus activated sludge Government is continuously developing the sewer constructions in order to raise the household connections prevalence rate which means there is more surplus activated sludge now In 2009 the amount of surplus activated sludge has reached 400 000 cubic meters per day Surplus activated sludge damages the environment seriously Therefore it is an urgent problem for the government and citizens to solve The air pollution is going seriously because of the high concentration NOx which comes from the emissions of petrochemical industry and vehicles When NOx is exposed to the atmosphere and combined with Ozone there comes a photochemical reaction The photochemical smog from this chemical reaction may cause some illnesses such as headache asthma and bronchitis Moreover NOx easily reacts with steam to form nitrogen acid rain Today sintered sewage sludge is used for stuffing material and grain gradation Even though the surplus activated sludge can be reused the range of usage is quite limited In this study I apply the best operating conditions to sintered sewage sludge First to coat two functional materials TiO2 and MnO2 with sintered sewage sludge Then expose it to the ultraviolet After that it can be used to convert NOx In this experiment 25% of NOx can be converted The conditions of this experiment are shown as follows: 50% filling rate coated TiO2 NOx 15ppm 0 5 L/min gas flow rat 30℃ 80% relative humidity 365nm and 20 watt ultraviole