本文選題：同步硝化反硝化 + 反硝化除磷��； 參考：《東南大學(xué)》2015年碩士論文

【摘要】：針對我國生活污水生物脫氮除磷過程中存在碳源不足、曝氣能耗高等問題,本文基于SBR反應(yīng)器,采用新型脫氮除磷運行方式：進水→厭氧攪拌→低氧曝氣→缺氧攪拌→好氧曝氣→沉淀→排泥出水,在厭氧段進行釋磷,低氧曝氣段實現(xiàn)SND,缺氧段進行反硝化除磷,好氧段進一步硝化及吸磷,在單泥系統(tǒng)中實現(xiàn)SND與反硝化除磷過程的耦合。本文在分別完成同步硝化反硝化污泥和反硝化除磷污泥馴化后,混合兩種污泥,在SBR反應(yīng)器內(nèi)實現(xiàn)SND與反硝化除磷的耦合,MLSS為3800mg/L～4000mg/L, SRT為20d左右,厭氧段、低氧段、缺氧段、好氧段的運行時間分別為2h、3h、3.5h、1n,常溫條件下,當(dāng)乙酸鈉為單一碳源,進水COD為150m∥L左右、COD/TN/P為25：5：1、pH為7.8時,系統(tǒng)的TN和TP去除率分別達到66.7%和96.1%。通過低氧段的SND過程和缺氧段的反硝化除磷過程去除的TN分別為39.8%和17.1%,通過低氧段吸磷和缺氧吸磷去除的TP分別為68.4%和22.7%。最終出水COD、氨氮、硝態(tài)氮、亞硝態(tài)氮、TN、tp濃度分別為10mg/L、2.16mg/L、 11.28mg/L.0.03mg/L、13.47mg/L、0.83mg/L。耦合-SBR系統(tǒng)內(nèi)厭氧釋磷量及低氧吸磷量隨初始pH值的升高而增加。初始pH對厭氧釋磷過程產(chǎn)生影響的原因是進水pH值影響厭氧段糖原代謝量和腺苷酸激酶(Adenylate kinase, ADK)與多聚磷酸鹽激酶(Polyphosphate kinase, PPK)活性。細胞合成能力隨初始pH的升高而增強,且較高的初始pH值下有較高的硝化活性和反硝化活性。ADK和PPK活性隨著pH的增加而增加。耦合系統(tǒng)除磷率隨著進水丙酸鈉/乙酸鈉比例的提高而升高,但丙酸鈉/乙酸鈉比例對TN去除率的影響不大。脫氫酶(Dehydrogenase, DH). PPK和ADK酶活性隨著丙酸鈉/乙酸鈉比例的增加而增加。以丙酸鈉為唯一碳源的耦合系統(tǒng)持續(xù)運行20天,出水COD、TN、TP和氨氮濃度分別為10mg/L、11.39mg/L、0.51mg/L及0.02mg/L。對于低C/N值生活污水,為有效的利用碳源以及通過SND過程與反硝化除磷過程的耦合以實現(xiàn)氮磷的有效去除,可通過調(diào)整階段時間控制外碳源主要分配在厭氧段和低氧段被去除,且在低氧段和缺氧段有充足的內(nèi)碳源。穩(wěn)定運行后的耦合-SBR系統(tǒng)內(nèi)PAO、AOB、NOB和dentrifier的相對豐度分別為41±11%,10±4%,13±9%和16±12%。進水碳源種類和初始pH對系統(tǒng)中的GAOs和PAOs的競爭產(chǎn)生影響,較高的進水pH有利于1'AOs競爭GAOs,隨著丙酸鈉在進水中比例的提高,PAOs的相對數(shù)量逐漸增加,但AOB、NOB和dentrifier的相對數(shù)量與碳源種類沒有相關(guān)性。耦合-SBR系統(tǒng)通過應(yīng)用反硝化除磷和SND技術(shù)提高了氮磷的去除效果,富集并穩(wěn)定脫氮除磷功能菌群,緩解了反硝化與厭氧釋磷過程對碳源的競爭,適宜處理低C/N值生活污水,并降低了需氧量,是一種可持續(xù)的生活污水脫氮除磷工藝。
[Abstract]:In order to solve the problems of insufficient carbon source and high energy consumption of aeration in the process of biological denitrification and phosphorus removal of domestic sewage, this paper is based on SBR reactor. A new operation method of nitrogen and phosphorus removal was adopted: anaerobic stirring in influent and anaerobic mixing in low oxygen, anoxic mixing and aerobic aeration to precipitate sludge discharge, phosphorus release in anaerobic stage, SND in low oxygen aeration stage and denitrifying phosphorus removal in anoxic stage. Further nitrification and phosphorus absorption in aerobic stage can realize the coupling of SND and denitrifying phosphorus removal process in a single mud system. After acclimation of simultaneous nitrification and denitrification sludge and denitrifying phosphorus removal sludge, two kinds of sludge were mixed, and the coupling of SND and denitrifying phosphorus removal was realized in SBR reactor. The MLSs of SND and denitrification phosphorus removal were 3800mg / L / L = 4 000 mg / L, SRT was about 20 d, anaerobic stage, low oxygen stage and anoxic stage. The operating time of aerobic stage is 2 h ~ 3 h ~ (3.5) h ~ (-1). When sodium acetate is a single carbon source and influent COD is 150 m / L or so, the removal rate of TN and TP is 66.7% and 96.1%, respectively, when COD / TNP is 25: 5: 1 / 1 and pH is 7.8. The TN removal rates of SND process and denitrification phosphorus removal process were 39.8% and 17.1%, respectively, and the TP removal through hypoxia stage and hypoxia stage were 68.4% and 22.7%, respectively. The final effluent concentration of COD, NH3-N, NO3-N and TNT _ p were 10 mg / L ~ (2.16 mg / L), 11.28 mg / L ~ (0.03) mg / L ~ (13. 47) mg / L ~ (-1) ~ 0.83 mg 路L ~ (-1) ~ (-1), respectively. The anaerobic phosphorus release and low oxygen phosphorus uptake increased with the increase of initial pH value in coupled SBR system. The effect of initial pH on anaerobic phosphorus release was due to the effect of influent pH on the metabolism of glycogen and the activities of adenylate kinase (Adenylate kinase,) and polyphosphate kinase (PPK). The cell synthesis ability increased with the increase of initial pH, and the nitrification activity, denitrification activity. ADK and PPK activity increased with the increase of pH value. The phosphorus removal rate of the coupling system increased with the increase of the ratio of sodium propionate to sodium acetate, but the ratio of sodium propionate to sodium acetate had little effect on the removal rate of TN. Dehydrogenase (DH). The activities of PPK and ADK increased with the increase of the ratio of sodium propionate to sodium acetate. With sodium propionate as the sole carbon source, the concentration of TNTP and NH3-N in effluent was 10 mg / L 11.39 mg / L 0.51 mg / L and 0.02 mg / L respectively. For domestic sewage with low C / N value, in order to utilize carbon source effectively and to realize effective nitrogen and phosphorus removal by coupling SND process with denitrifying phosphorus removal process, external carbon sources can be controlled to be removed mainly in anaerobic and low oxygen stages by adjusting stage time. And there are sufficient internal carbon sources in hypoxia and anoxia. The relative abundance of dentrifier and PAO AOB in the coupled SBR system was 41 鹵1110 鹵4 10 鹵9% and 16 鹵12%, respectively. The competition between GAOs and PAOs in the system was affected by the type of carbon source and the initial pH. The higher influent pH was favorable to the competition of GAOs. with the increase of the ratio of sodium propionate in the influent, the relative quantity of PAOs increased gradually. However, there was no correlation between the relative number of AOB and dentrifier and the carbon source species. By using denitrifying phosphorus removal and SND technology, coupled SBR system can improve the removal efficiency of nitrogen and phosphorus, enrich and stabilize the functional flora of denitrification and phosphorus removal, alleviate the competition of carbon source in denitrification and anaerobic phosphorus release process, and is suitable for treating domestic sewage with low C / N value. It is a sustainable nitrogen and phosphorus removal process for domestic sewage.
【學(xué)位授予單位】：東南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：X703

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