【摘要】：為實(shí)現(xiàn)高氨氮廢水的高效低耗穩(wěn)定去除,在常溫條件下,對曝氣生物濾池(BAF)中實(shí)現(xiàn)與穩(wěn)定短程硝化-厭氧氨氧化自養(yǎng)脫氮工藝進(jìn)行了研究。研究結(jié)果表明:常溫條件下,BAF接種二沉池回流污泥,采用悶曝-連續(xù)運(yùn)行結(jié)合的接種掛膜方式,可成功實(shí)現(xiàn)短程硝化-厭氧氨氧化一體化自養(yǎng)脫氮。悶曝階段使種泥活性恢復(fù),而連續(xù)流運(yùn)行過程中游離氨(FA)濃度高,可抑制亞硝酸鹽氧化菌(NOB),實(shí)現(xiàn)BAF中亞硝酸鹽累積;通過調(diào)整BAF回流方式,降低回流液中NO_2~-N-,防止NOB生長,并通過厭氧氨氧化(Anammox)濾池出水回流方式,接種微量Anammox菌,運(yùn)行80 d可實(shí)現(xiàn)短程硝化-厭氧氨氧化,140 d后系統(tǒng)運(yùn)行穩(wěn)定,總氮(TN)去除率達(dá)76.62%。生物濾池有利于短程硝化-厭氧氨氧化工藝的實(shí)現(xiàn)與穩(wěn)定,生物膜中不同厚度存在好氧缺氧環(huán)境,利于氨氧化菌(AOB)和Anammox菌共存;濾料的過濾作用有效地防止了Anammox菌流失,使其在系統(tǒng)中不斷累積生長。不僅如此,AOB和Anammox菌均為自養(yǎng)菌且生長緩慢,避免了生物濾池的頻繁反沖洗,簡化了生物濾池的運(yùn)行。氣水比是BAF中一體化運(yùn)行的關(guān)鍵參數(shù),本研究中最佳的氣水比為12:1,氨氮去除負(fù)荷達(dá)到0.91 kg N·m~(-3)·d~(-1),氨氮和TN去除率分別可達(dá)96.86%和85.47%。
[Abstract]:In order to realize the stable removal of high ammonia nitrogen wastewater with high efficiency and low consumption, the process of realizing and stabilizing autotrophic denitrification in (BAF) of biological aerated filter was studied in this paper. The results showed that under normal temperature, BAF inoculated secondary settling tank reflux sludge, and adopted the method of aeration and continuous operation of inoculation and hanging membrane, which could successfully realize the integrated autotrophic denitrification of short course nitrification-anaerobic ammonia oxidation. In the stage of aeration, the activity of seed mud was restored, and the concentration of free ammonia (FA) was high during the continuous flow operation, which could inhibit the nitrite accumulation of (NOB),. By adjusting the reflux mode of BAF, reducing the NO_2~-N-, in the reflux liquid to prevent the NOB growth, and inoculating the microamount of Anammox bacteria in the effluent of the (Anammox) filter by anaerobic ammonia oxidation, the short-cut nitrification-anaerobic ammonia oxidation could be realized in 80 days. After 140 days, the system was stable and the removal rate of total nitrogen (TN) reached 76.62%. Biofilter is conducive to the realization and stability of short-cut nitrification-anaerobic ammonia oxidation process. Aerobic anoxic environment exists in different thickness of biofilm, which is conducive to the coexistence of (AOB) and Anammox bacteria in the biofilm. The filtration effect of filter media can effectively prevent the loss of Anammox bacteria and make it accumulate and grow in the system. Moreover, both AOB and Anammox bacteria are autotrophic bacteria and grow slowly, which avoids frequent backwashing of biofilter and simplifies the operation of biofilter. The gas-water ratio is the key parameter in the integrated operation of BAF. The optimum air-water ratio in this study is 12: 1, and the removal load of ammonia and nitrogen reaches 0.91 kg N m-3 d-1. The removal rates of ammonia nitrogen and TN were 96.86% and 85.47% respectively.
【作者單位】： 北京工業(yè)大學(xué)城鎮(zhèn)污水深度處理與資源化利用技術(shù)國家工程實(shí)驗(yàn)室;中國人民大學(xué)環(huán)境學(xué)院;
【基金】：國家自然科學(xué)基金項(xiàng)目(51508561)~~
【分類號】：X703.1

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