發(fā)布時間：2018-03-26 13:29

  本文選題：微孔曝氣變速氧化溝　切入點：脫氮除磷　出處：《西安建筑科技大學》2015年碩士論文

【摘要】：采用微孔曝氣變速氧化溝中試系統(tǒng)處理城市污水,研究其對污水中氮、磷和有機物的去除效果,同時采用靜態(tài)試驗的方法考察該系統(tǒng)內活性污泥的反硝化除磷與硝化性能,并分析進水C/N和C/P對脫氮除磷的影響、不同電子受體的吸磷過程對比及溫度對污泥硝化速率的影響。試驗結果表明:(1)微孔曝氣變速氧化溝中試系統(tǒng)對城市生活污水中氮、磷和有機物有很好的去除效果,穩(wěn)定運行期間中試系統(tǒng)對進水中的COD、NH4+-N、TN及TP的平均去除率分別為92%、96.9%、81.8%和94.5%;出水COD、NH4+-N、TN和TP的平均濃度分別為30.7mg/L、1.17mg/L、11.4mg/L和0.34mg/L。各污染物指標除TP外,均達到我國城市污水處理廠污水排放標準(GB18918-2002)一級A排放標準,TP的達標率為84%。(2)進水C/N和C/P比對微孔曝氣變速氧化溝中試系統(tǒng)脫氮除磷有影響,進水C/N比為5~6時,系統(tǒng)取得更好的脫氮除磷效果;進水C/P比與系統(tǒng)脫氮沒有明顯的相關性;進水C/P比為60~80時,系統(tǒng)取得更好的除磷能力。(3)微孔曝氣變速氧化溝中試系統(tǒng)存在明顯的反硝化除磷現象,系統(tǒng)內活性污泥中DPB占PAOs的61%。反硝化吸磷過程中,以氧、硝酸鹽和亞硝酸鹽為吸磷過程的電子受體時,吸磷速率大小依次為:氧硝酸鹽亞硝酸鹽。且反硝化除磷過程中,硝酸鹽、亞硝酸鹽的消耗量與吸磷量之間的化學計量關系(P吸收/N消耗,質量比)分別為0.96和0.65。(4)微孔曝氣變速氧化溝中試系統(tǒng)具有較好的硝化性能,活性污泥AUR和NUR分別為3.89~5.59 mg-N/(g·VSS·h)和2.98~6.93 mg-N/(g·VSS·h),平均值分別為4.57 mg-N/(g·VSS·h)和4.63 mg-N/(g·VSS·h)。(5)溫度對微孔曝氣變速氧化溝中試系統(tǒng)活性污泥硝化能力影響大,系統(tǒng)污泥的AUR與NUR值隨溫度的升高呈逐漸增大的趨勢。15℃以下時,中試系統(tǒng)活性污泥中AOB和NOB活性急劇下降,生物硝化能力降低。并且,溫度低于10℃時,污泥的硝化能力明顯降低。(6)針對試驗期間由于回流系統(tǒng)出現故障引發(fā)的污泥濃度低、硝化細菌數量大幅減少、出水氨氮高的現象,采取降低進水量、加大曝氣量、減少排泥量等措施恢復污泥的硝化能力,調試100d后,中試系統(tǒng)污泥硝化性能完全恢復,為實際工程中活性污泥系統(tǒng)的運行與調控提供參考。(7)應用ASM2d簡化模型對微孔曝氣變速氧化溝中試系統(tǒng)生物硝化過程進行模擬,硝化模型的模擬結果變化趨勢與實際運行過程基本吻合,浮動范圍為-0.84~2.59mg/L。
[Abstract]:In this paper, a pilot system of microporous aeration variable speed oxidation ditch was used to treat municipal sewage, and the removal efficiency of nitrogen, phosphorus and organic matter in sewage was studied. At the same time, the denitrifying phosphorus removal and nitrification performance of activated sludge in the system were investigated by static test. The effects of influent C / N and C / P on denitrification and phosphorus removal, the comparison of phosphorus absorption process of different electron receptors and the effect of temperature on sludge nitrification rate were analyzed. Phosphorus and organic matter were removed very well. The average removal rates of COD NH 4 N N N and TP in influent during steady operation were 92.2% and 94.5%, respectively. The ratio of C / N and C / P in influent water is 84 / 2). The ratio of C / N and C / P in influent water is affected by denitrification and phosphorus removal in the pilot system of micropore aeration variable speed oxidation ditch. The ratio of influent C / N is 56-6. The system achieved better denitrification and phosphorus removal effect; the influent C / P ratio had no obvious correlation with the system denitrification; when the influent C / P ratio was 60 ~ 80, A better phosphorus removal capacity was obtained in the system. (3) there was obvious phenomenon of denitrifying phosphorus removal in the pilot system of micropore aeration variable speed oxidation ditch. The DPB in activated sludge accounted for 61% of PAOs in the system. Oxygen was used in denitrification and phosphorus absorption process. When nitrate and nitrite are electron receptors in phosphorus absorption process, the order of phosphorus uptake rate is nitrite. The stoichiometric relationship between the consumption of nitrite and the amount of phosphorus uptake. The ratio of P absorption to N consumption and mass ratio are 0.96 and 0.65.4respectively. The pilot system of micropore aeration variable speed oxidation ditch has better nitrification performance. The AUR and NUR of activated sludge were 3.89 ~ 5.59 mg-N/(g VSS (h) and 2.98 ~ 6.93 mg-N/(g VSS h respectively, the average values were 4.57 mg-N/(g VSS h) and 4.63 mg-N/(g VSS h 路h) respectively. The nitrification capacity of activated sludge was greatly affected by the temperature of 4.63 mg-N/(g VSS. 5) in the pilot system of micropore aeration variable speed oxidation ditch, the nitrification capacity of activated sludge was greatly affected. The AUR and NUR values of sludge increased gradually with the increase of temperature. Below 15 鈩，

本文編號：1668055