本文關(guān)鍵詞：部分亞硝化—厭氧氨氧化工藝處理有機(jī)高氨氮廢水研究　出處：《蘇州科技學(xué)院》2015年碩士論文　論文類型：學(xué)位論文

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【摘要】：部分亞硝化-厭氧氨氧化工藝(PN-Anammox)是一種新型生物脫氮工藝,具有能耗低、污泥產(chǎn)量少、脫氮速率高等優(yōu)點(diǎn)。特別是對(duì)高氨氮廢水進(jìn)行脫氮處理時(shí),該工藝克服了傳統(tǒng)生物脫氮工藝所面臨的碳源不足問題。而在實(shí)際生產(chǎn)中大多數(shù)高氨氮廢水中都含有一定濃度的有機(jī)物,這樣的有機(jī)物濃度水平雖然低于傳統(tǒng)脫氮微生物對(duì)有機(jī)碳源的需求,但已經(jīng)會(huì)對(duì)PN-Anammox工藝產(chǎn)生影響,這極大地限制了該工藝的應(yīng)用范圍。為了使PN-Anammox工藝有更大的應(yīng)用空間,通過本課題組自行設(shè)計(jì)的PN-Anammox反應(yīng)器進(jìn)行了處理有機(jī)高氨氮廢水的研究。以酒精廢水為例,通過三組實(shí)驗(yàn)相互對(duì)比發(fā)現(xiàn)PN-Anammox工藝在處理有機(jī)高氨氮廢水時(shí),有機(jī)物未對(duì)亞硝化產(chǎn)生影響,全過程中亞硝化速率基本維持不變。但有機(jī)物使得在厭氧氨氧化區(qū)中生長(zhǎng)了大量的反硝化菌,與anammox菌競(jìng)爭(zhēng)亞硝酸鹽,使厭氧氨氧化脫氮速率下降。同時(shí)反硝化菌的脫氮速率低于原厭氧氨氧化脫氮速率,因此反應(yīng)器的脫氮速率表現(xiàn)為下降。有機(jī)物對(duì)亞硝化的影響是通過異養(yǎng)菌與氨氧化菌(AOB)競(jìng)爭(zhēng)DO產(chǎn)生,可以通過適當(dāng)提高DO來緩解異養(yǎng)菌與AOB的競(jìng)爭(zhēng),從而削弱有機(jī)物對(duì)亞硝化的影響,并同時(shí)去除有機(jī)物。通過一系列在不同進(jìn)水氨氮和有機(jī)物濃度下的實(shí)驗(yàn)得到了在亞硝化不受有機(jī)物影響的前提下,氨氮、有機(jī)物和曝氣量之間的關(guān)系。在批式實(shí)驗(yàn)中發(fā)現(xiàn),有機(jī)物對(duì)厭氧氨氧化的影響與有機(jī)物濃度和厭氧氨氧化能力有關(guān)。用NRR表示厭氧氨氧化能力,ICTOC表示有機(jī)物對(duì)厭氧氨氧化的影響濃度,當(dāng)有機(jī)物濃度大于該ICTOC值后,厭氧氨氧化將受到影響。這些作用反饋?zhàn)饔糜诜磻?yīng)器又表現(xiàn)為NRR水平下降。并以葡萄糖為例,通過實(shí)驗(yàn)發(fā)現(xiàn)當(dāng)NRR為0.45~1.86kg·m-3·d-1時(shí),NRR與ICTOC呈指數(shù)函數(shù)關(guān)系。通過研究有機(jī)物分別對(duì)亞硝化和厭氧氨氧化的影響,提出了基于PN-Anammox串聯(lián)工藝處理有機(jī)高氨氮廢水的方案。即在保證亞硝化不受有機(jī)物影響的前提下,使亞硝化區(qū)出水中有機(jī)物濃度降低至可以對(duì)厭氧氨氧化產(chǎn)生影響的濃度以下,從而解除有機(jī)物對(duì)PN-Anammox工藝的影響,并在實(shí)驗(yàn)中驗(yàn)證該方案的可行性。PN-Anammox反應(yīng)器在溫度30℃、反應(yīng)器中pH8.0、HRT 10h、進(jìn)水氨氮濃度250mg·L-1、曝氣量300L·h-1的條件下穩(wěn)定運(yùn)行。向進(jìn)水中加入80 mg·L-1的TOC,此時(shí)反應(yīng)器的厭氧氨氧化脫氮速率為0.6 kg·m-3·d-1,為了使亞硝化區(qū)出水中的有機(jī)物降至此時(shí)的ICTOC值65 mg·L-1以下,將曝氣量提高至500 L·h-1。經(jīng)過長(zhǎng)時(shí)間地運(yùn)行后,有機(jī)物并未對(duì)反應(yīng)器產(chǎn)生抑制,這說明了上述策略可以使PN-Anammox工藝成功地用于處理有機(jī)高氨氮廢水。
[Abstract]:Partial nitrification-anaerobic ammonia oxidation (PN-Anammox) is a new biological nitrogen removal process with low energy consumption and low sludge yield. The advantages of high denitrification rate, especially in denitrification treatment of wastewater with high ammonia nitrogen. This process overcomes the shortage of carbon source in the traditional biological nitrogen removal process, and in practice, most wastewater containing high ammonia nitrogen contains certain concentration of organic matter. Although the concentration level of organic matter is lower than the demand for organic carbon source by traditional denitrification microorganisms, it will have an impact on the PN-Anammox process. This greatly limits the scope of application of this process. In order to make the PN-Anammox process have more application space. The treatment of organic wastewater with high ammonia nitrogen was studied by PN-Anammox reactor designed by our team. The alcohol wastewater was taken as an example. Through the comparison of three groups of experiments, it was found that organic matter had no effect on nitrification when PN-Anammox process was used to treat organic wastewater with high ammonia nitrogen. Nitrite rate remained unchanged throughout the process, but organic matter led to the growth of a large number of denitrifying bacteria in the anaerobic ammonia oxidation zone, and competed with anammox bacteria to compete for nitrite. The denitrification rate of denitrifying bacteria was lower than that of original anaerobic ammonia oxidation. As a result, the nitrogen removal rate of the reactor decreased, and the effect of organic matter on nitrosation was produced by competing for do between heterotrophic bacteria and ammonia oxidizing bacteria (AOB). The competition between heterotrophic bacteria and AOB can be alleviated by properly increasing do, thus weakening the effect of organic matter on nitrosation. Through a series of experiments under different influent ammonia nitrogen and organic concentration, the ammonia nitrogen was obtained under the premise that nitrification was not affected by organic matter. In batch experiment, it was found that the effect of organic matter on anaerobic ammonia oxidation was related to the concentration of organic matter and the ability of anaerobic ammonia oxidation. NRR was used to express the ability of anaerobic ammonia oxidation. ICTOC indicates the effect of organic matter on anaerobic ammoxidation, when the concentration of organic matter is greater than the ICTOC value. Anaerobic ammoxidation will be affected. These feedback effects on the reactor also show a decrease in NRR levels, and glucose is taken as an example. It was found that when the NRR was 0.45 ~ (-1) kg 路m ~ (-3) 路d ~ (-1). The relationship between NRR and ICTOC was exponential. The effects of organic compounds on nitrification and anaerobic ammonia oxidation were studied. The scheme of treating organic wastewater with high ammonia nitrogen based on PN-Anammox series process is put forward, that is, nitrification is not affected by organic matter. The concentration of organic matter in the effluent of the nitrified zone was reduced below the concentration which could affect the anaerobic ammonia oxidation, so that the effect of organic matter on the PN-Anammox process was removed. The feasibility of the method was verified in the experiment. The influent ammonia concentration was 250mg 路L ~ (-1) at 30 鈩，

本文編號(hào)：1385666