本文選題：低碳源　切入點：UCT復合MBR　出處：《華中科技大學》2015年碩士論文　論文類型：學位論文

【摘要】：傳統(tǒng)工藝在處理低碳源的污水時,經常會出現出水氮、磷含量超標的情況,其根本原因是碳源不足,反硝化細菌難以獲得足夠能量進行反硝化,而聚磷菌難以獲得足夠能量進行好氧吸磷,所以脫氮除磷效率低。為解決上述問題,研究采用UCT復合MBR工藝,在不改變DO和MLSS的基礎上,通過改變硝化液回流比、水力停留時間、分段進水及在缺氧區(qū)投加填料等方式尋找最優(yōu)處理工況。分析在不同工況下不同污染物的去除效果及濾膜的作用,同時分析填料生物相及投加填料后對污染物的去除影響及其機理。此外,在ASM1和ASM2D模型基礎上分別建立并驗證了厭氧區(qū)有機物降解模型,缺氧區(qū)反硝化除磷模型和好氧區(qū)硝化模型。得到了如下結論。(1)工藝對COD的去除效果良好,所有工況出水平均值均優(yōu)于《城鎮(zhèn)污水處理廠污染物排放標準》(GB18918-2002)一級A標準。運行期間TN去除率平均為83.41%,說明工藝能夠在較低的C源時取得較好的處理效果,并且裝置缺氧段出現了短程硝化反硝化。投加填料能明顯提高亞硝態(tài)氮的積累。工藝對TP去除效果良好,工況一、二和三達到城鎮(zhèn)污水處理廠污染物排放標準一級B,工況四和五可以達到一級A標準。裝置在不同工況出現了不同程度的反硝化除磷效果,其中工況五的反硝化除磷率達到了39%,說明投加填料對反硝化除磷有較好的強化效果。最優(yōu)工況為工況五,工況參數為水力停留時間8h,硝化液回流比150%,采用分段進水方式并在缺氧區(qū)投加填料。(2)平板膜組件對COD、TN、NH3-N、TP的去除貢獻率分別為9.63%、7.01%、0.86%、0.82%,說明膜對不同污染物有不同的截留效果。圓形平板膜污染為三個階段,第一階段為濾餅層污染,第二階段形成動態(tài)膜,抑制通量進一步減小,第三階段膜孔堵塞,造成不可逆污染。在缺氧池投加填料后,裝置的整體處理效果和穩(wěn)定性得到提高。(3)在ASM1模型、ASM2D模型基礎上,建立了針對厭氧區(qū)、缺氧區(qū)和好氧區(qū)的有機物降解、缺氧區(qū)反硝化除磷及好氧區(qū)硝化三個模型。①厭氧區(qū)出水COD濃度穩(wěn)態(tài)方程的模型預測值最小誤差率為0.79%,最大誤差率4.15%;②缺氧區(qū)出水總磷濃度濃度穩(wěn)態(tài)方程的模型預測值最小誤差率為1.44%,最大誤差率為11.33%;③好氧段出水氨氮濃度的穩(wěn)態(tài)方程的模型預測值最小誤差率為3.63%,最大誤差率為15.23%。
[Abstract]:In the treatment of low carbon source sewage, the effluent nitrogen and phosphorus content in the traditional process often appear the situation that the content of nitrogen and phosphorus exceeds the standard. The fundamental reason is that the carbon source is insufficient, so denitrifying bacteria can not get enough energy to denitrification. In order to solve the above problem, the UCT compound MBR process was used to solve the problem, and on the basis of not changing do and MLSS, the ratio of nitrifying solution reflux was changed, in order to solve the above problems, the phosphorus accumulating bacteria could not get enough energy to absorb phosphorus by aerobic absorption, so the nitrogen and phosphorus removal efficiency was low. Hydraulic retention time (HRT), subsection inlet water and adding packing in anoxic zone were used to find the optimal treatment conditions. The removal effect of different pollutants and the effect of filter membrane were analyzed under different working conditions. At the same time, the effects of biophase on the removal of pollutants and its mechanism were analyzed. In addition, the degradation models of organic matter in anaerobic zone were established and verified on the basis of ASM1 and ASM2D models, respectively. The model of denitrification and phosphorus removal in anoxic zone and the model of nitrification in aerobic zone were obtained. The average effluent of all working conditions is better than the first class A standard of "pollutant discharge standard of municipal wastewater treatment plant" (GB18918-2002). The average TN removal rate during operation is 83.41, which shows that the process can obtain better treatment effect at lower C source. And the short cut nitrification and denitrification appeared in the anoxic section of the plant. The addition of filler could obviously increase the accumulation of nitrite nitrogen. The process had a good removal effect on TP. Two and three reached the first class B of the municipal wastewater treatment plant pollutant discharge standard, and four and five conditions could reach the first A standard. The device had different degrees of denitrifying phosphorus removal effect in different working conditions. The denitrifying phosphorus removal rate of working condition 5 has reached 39, which shows that adding filler has a better enhancement effect on denitrifying phosphorus removal. The operating condition parameters are HRT 8 h, nitrifying liquid reflux ratio 150, the removal contribution rate of COD TNN NH 3-NN TP to COD TNN NH 3-NN TTP removal by means of subsection influent and adding packing. 2 in anoxic zone is 9. 63% 7.01% 0.86% 0.82% respectively, which shows that the membrane has different retention efficiency to different pollutants. The circular flat membrane fouling is divided into three stages. The first stage is filter cake layer pollution, the second stage forms dynamic membrane, the inhibition flux decreases further, the third stage membrane hole is blocked, causing irreversible pollution. The overall treatment efficiency and stability of the plant were improved. (3) based on the ASM1 model and ASM2D model, the degradation of organic matter in anaerobic, anoxic and aerobic regions was established. Three models of denitrifying phosphorus removal in anoxic zone and nitrification in aerobic area..1 the model prediction of COD steady state equation of effluent concentration in anaerobic zone is predicted by the model with minimum error rate of 0.79 and maximum error rate of 4.15% with respect to the steady-state equation of effluent total phosphorus concentration in anoxic zone. The minimum error rate of the model is 1.44 and the maximum error rate is 11.33 ~ 3 aerobic effluent ammonia nitrogen concentration. The minimum error rate is 3.63 and the maximum error rate is 15.2323.
【學位授予單位】：華中科技大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：X703

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本文編號：1578211