本文主要研究内容
作者兰兰(2019)在《亚硝酸型-SOAD过程中NO和N2O的积累特征及机理》一文中研究指出:硫自养反硝化(Sulfide-oxidizing autotrophic denitrification,SOAD)以其绿色、高效、无二次污染、污泥产量低等优点受到国内外学者的广泛关注。SOAD过程氧化亚氮(Nitrous oxide,N2O)发生积累的机理还存在诸多争议,而关于一氧化氮(Nitric oxide,NO)积累的研究尚处于空白。本研究通过搭建容易导致NO和N2O发生积累的亚硝酸型-SOAD序批式生物膜反应器,进行了多组初始S2-、NO2-浓度不同的过程线测定实验,在线监测了NO、N2O、DO、pH等理化指标,并取样分析测定S2-、NO2-、SO42-等离子指标。基本明确了亚硝酸型-SOAD的反应机理和特点,以及NO和N2O发生积累的特征和机理,主要结论如下:SOAD分两阶段进行,第一阶段主要以S2-为电子供体,第二阶段主要以S0为电子供体,pH变化可以较为准确地指示SOAD的两阶段。当进水S/N质量比为4时,SOAD过程电子供体S2-过剩会抑制第二阶段的S0氧化,使SOAD以S0为主要硫氧化产物。S/N比为2时,TN去除速率最快。高浓度亚硝酸盐是NO发生积累的必要条件。虽然,S2-是SOAD过程NO产生和积累重要诱导因子,但低S/N更容易导致NO的积累。在进水30 mg NO2--N/L,S/N为1时,NO积累量最大,为1.1 mg NO-N/L。NO积累过程中有明显的溶氧仪读数升高现象,可能有NO歧化产氧现象发生。SOAD系统中N2O的积累主要由S2-/H2S和游离亚硝酸(Free nitrite acid,FNA)的双重抑制导致。S2-作为电子供体,促进整个反硝化过程的同时,也是N2O还原过程的抑制因子。S2-浓度高于10 mg S2--S/L时,将对Nos活性产生一种恒定抑制,当S2-浓度低于5 mg S2--S/L时,将表现为与H2S浓度相关的非竞争抑制。FNA的抑制作用既会在高浓度的S2-环境中被S2-还原作用削弱,也会在低浓度的S2-环境中被H2S/S2-的抑制效应增强。接种垃圾渗滤液浓缩液污泥的亚硝酸型-SOAD生物膜反应器的优势菌属为Thiobacillus、Ottowia和Thiovirga。接种普通城市污水处理厂好氧污泥,经过相同的驯化培养后得到以Thiobacillus为绝对优势菌属的亚硝酸型-SOAD反应器。两种接种不同性质污泥的反应器优势菌属构成虽然有所差异,但具有相同的脱氮除硫特征。
Abstract
liu zi yang fan xiao hua (Sulfide-oxidizing autotrophic denitrification,SOAD)yi ji lu se 、gao xiao 、mo er ci wu ran 、wu ni chan liang di deng you dian shou dao guo nei wai xue zhe de an fan guan zhu 。SOADguo cheng yang hua ya dan (Nitrous oxide,N2O)fa sheng ji lei de ji li hai cun zai zhu duo zheng yi ,er guan yu yi yang hua dan (Nitric oxide,NO)ji lei de yan jiu shang chu yu kong bai 。ben yan jiu tong guo da jian rong yi dao zhi NOhe N2Ofa sheng ji lei de ya xiao suan xing -SOADxu pi shi sheng wu mo fan ying qi ,jin hang le duo zu chu shi S2-、NO2-nong du bu tong de guo cheng xian ce ding shi yan ,zai xian jian ce le NO、N2O、DO、pHdeng li hua zhi biao ,bing qu yang fen xi ce ding S2-、NO2-、SO42-deng li zi zhi biao 。ji ben ming que le ya xiao suan xing -SOADde fan ying ji li he te dian ,yi ji NOhe N2Ofa sheng ji lei de te zheng he ji li ,zhu yao jie lun ru xia :SOADfen liang jie duan jin hang ,di yi jie duan zhu yao yi S2-wei dian zi gong ti ,di er jie duan zhu yao yi S0wei dian zi gong ti ,pHbian hua ke yi jiao wei zhun que de zhi shi SOADde liang jie duan 。dang jin shui S/Nzhi liang bi wei 4shi ,SOADguo cheng dian zi gong ti S2-guo sheng hui yi zhi di er jie duan de S0yang hua ,shi SOADyi S0wei zhu yao liu yang hua chan wu 。S/Nbi wei 2shi ,TNqu chu su lv zui kuai 。gao nong du ya xiao suan yan shi NOfa sheng ji lei de bi yao tiao jian 。sui ran ,S2-shi SOADguo cheng NOchan sheng he ji lei chong yao you dao yin zi ,dan di S/Ngeng rong yi dao zhi NOde ji lei 。zai jin shui 30 mg NO2--N/L,S/Nwei 1shi ,NOji lei liang zui da ,wei 1.1 mg NO-N/L。NOji lei guo cheng zhong you ming xian de rong yang yi dou shu sheng gao xian xiang ,ke neng you NOqi hua chan yang xian xiang fa sheng 。SOADji tong zhong N2Ode ji lei zhu yao you S2-/H2She you li ya xiao suan (Free nitrite acid,FNA)de shuang chong yi zhi dao zhi 。S2-zuo wei dian zi gong ti ,cu jin zheng ge fan xiao hua guo cheng de tong shi ,ye shi N2Ohai yuan guo cheng de yi zhi yin zi 。S2-nong du gao yu 10 mg S2--S/Lshi ,jiang dui Noshuo xing chan sheng yi chong heng ding yi zhi ,dang S2-nong du di yu 5 mg S2--S/Lshi ,jiang biao xian wei yu H2Snong du xiang guan de fei jing zheng yi zhi 。FNAde yi zhi zuo yong ji hui zai gao nong du de S2-huan jing zhong bei S2-hai yuan zuo yong xiao ruo ,ye hui zai di nong du de S2-huan jing zhong bei H2S/S2-de yi zhi xiao ying zeng jiang 。jie chong la ji shen lv ye nong su ye wu ni de ya xiao suan xing -SOADsheng wu mo fan ying qi de you shi jun shu wei Thiobacillus、Ottowiahe Thiovirga。jie chong pu tong cheng shi wu shui chu li an hao yang wu ni ,jing guo xiang tong de xun hua pei yang hou de dao yi Thiobacilluswei jue dui you shi jun shu de ya xiao suan xing -SOADfan ying qi 。liang chong jie chong bu tong xing zhi wu ni de fan ying qi you shi jun shu gou cheng sui ran you suo cha yi ,dan ju you xiang tong de tuo dan chu liu te zheng 。
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论文作者分别是来自长安大学的兰兰,发表于刊物长安大学2019-11-04论文,是一篇关于硫化物论文,一氧化氮论文,氧化亚氮论文,游离亚硝酸论文,长安大学2019-11-04论文的文章。本文可供学术参考使用,各位学者可以免费参考阅读下载,文章观点不代表本站观点,资料来自长安大学2019-11-04论文网站,若本站收录的文献无意侵犯了您的著作版权,请联系我们删除。
标签:硫化物论文; 一氧化氮论文; 氧化亚氮论文; 游离亚硝酸论文; 长安大学2019-11-04论文;