【作者】 王焘；

【导师】 任勇翔；

【作者基本信息】 西安建筑科技大学 ， 市政工程， 2009， 硕士

【摘要】 城市污水处理厂污泥处理过程中产生的污泥水（厌氧消化池上清液、浓缩池上清液和脱水滤液）中含有高浓度的氨氮,将其直接回流至污水处理系统进水口会导致系统氮负荷过高,影响出水水质。本文对污泥水的单独处理技术、污泥水富集硝化菌的效果、以污泥水富集硝化菌为添加源添加对同样采用SBR工艺的污水处理系统降解有机物以及硝化能力的促进作用、污泥水反应器内的好氧反硝化现象进行了研究。主要结论如下:（1）在进行高氨条件下硝化污泥驯化时,SBR反应器采用高氨启动,进水氨氮浓度为100mg/L,经过25～30d,成功地使适应高氨浓度的硝化菌得以富集,实现了反应器内生物相的选择。（2）污泥水单独处理试验过程中,高氨SBR反应器硝化性能良好,DO=2mg/L,pH维持在8～8.5左右时,氨氮和亚硝氮去除率均在95%以上。好氧段出现了明显的pH先下降后上升的现象,氮平衡的结果表明在好氧段硝化基本完成后,随即出现反硝化现象,TN去除率可达65-70%,而厌氧阶段反硝化现象并不明显。另外,在维持系统HRT、SRT和A/O不变（分别为30h、20d、1/3）的情况下,通过对SBR周期为12h、6h、4h时的研究表明,在满足系统硝化能力的前提下单纯改变SBR周期历时对系统的硝化能力并没有显著影响,TN去除率均保持在60%左右,且绝大多数TN的去除在好氧段完成。（3）在以污泥水为添加源、富集硝化细菌用的SBR反应器中,最大氨氧化速率为97.5 mgNH₄⁺-N/L·h,最大比氨氧化速率为32.8 mgNH₄⁺-N/gVSS·h;最大亚硝酸盐氧化速率为43.4 mgNO₂^--N/L·h,最大比亚硝酸盐氧化速率为14.6 mgNO₂^--N/gVSS·h。FISH技术测定的结果表明,氨氧化细菌（AOB）的优势菌属为Nitrosomonaseuropaea/Nitrosococcus mobilis,亚硝酸盐氧化细菌（NOB）的优势菌属为Nitrobacter spp.（4）通过连续添加,能明显的促进污水处理系统的有机物降解能力和硝化能力,且在添加停止后这种促进作用仍能保持较长时间。另外,这种添加使污水处理系统中原生动物数量和种类都大幅度增加。（5）针对高氨污泥水反应器中出现的好氧段TN的显著去除现象,利用微小电极装置测定了污泥絮体内部的DO分布情况,并研究了好氧条件下低浓度污泥的反硝化行为。结果表明,在高氨污泥水硝化污泥中存在的好氧反硝化现象,其原因是污泥絮体内部微环境DO传递不均匀所造成的厌氧反硝化和污泥内的好氧反硝化菌的共同作用所致。更多还原

【Abstract】 The reject water comes from the sludge treatment process in the wastewater treatment plant is of high ammonia influent,it may lead the exorbitant ammonia loading of the whole wastewater treatment system and may influence the effluent quality if refluence to the infall. This study investigated the technology of independent treatment of the reject water and the effect of accumulated nitrifying bacteria,which were bred by the reject water in a sequencing batch reactor（SBR）.The strategy of bioaugmentation using accumulated nitrifying bacteria to the wastewater treatment system to enhance the biodegradation of organic matters and nitrification performance was also performed.Then,a study on the phenomena of the aerobic denitrification in the reject water reactor was carried out.The main conclusions are as follows.（1）The SBR was started up using a high influent with ammonia concentration at 100mg/L when incubate the nitrifying active sludge which favors the high ammonia concentration.The nitrifying bacteria were successfully accumulated,and the preference flora was obtained after 25-30 days.（2）An effective nitrification performance was obtained in SBR at a high influent of ammonia when the reject water was treated independently.More than 95%of the average removal efficiency of ammonia and nitrite could be achieved at 2mg/L of DO and 8～8.5 of pH. An obvious phenomenon of pH went downward and upward was found.The result of nitrogen balance showed that the denitrification occurred immediately after the nitrification achieved in the aerobic condition,65-70%of TN was removed,but there was little denitrification in the anaerobic condition.A market effect on the nitrification in wastewater treatment system could not be found when the duration of SBR cycle was only changed as 12h,6h and 4h,in this time,the HRT,SRT and A/O ratio kept at 30h,20d and 1:3,respectively.About 60%of the average removal efficiency of TN could be achieved,the most of TN was removed in the aerobic stage.（3）In the SBR that was used to accumutated the of nitrifying bacteria by the addition of reject water,the maximum ammonia uptake rate（AUR） was 97.5 mgNH₄⁺-N/L·h,the maximum specific AUR was 32.8 mgNH₄⁺-N/gVSS·h,the maximum nitrite uptake rate （NUR） was 43.4 mgNO₂^--N/L·h and the maximum specific NUR was 14.6 mgNO₂^--N/gVSS·h.The result of fluorescence in situ hybridization（FISH） revealed that the dominant ammonia oxidizing bacteria was Nitrosomonas europaea and Nitrosococcus mobilis,the dominant nitrite oxidizing bacteria was Nitrobacter spp.（4） The ability of organism biodegradation and nitrification performance could be enhanced markedly by the bioaugmentation,and the enhancing effect may keep for some days after the bioaugment ceased,on the other hand,bioaugmentation may result in much increasing in the quantity and the diversity of protozoa.（5） The distribution of DO in the sludge flocs was determined by microelectrodes for oxygen,since a market removal of TN occurred in the aerobic stage of the reject water reactor. The behavior of denitrification of low concentration sludge in aerobic condition was also examed.The results showed that the phenomenon of the aerobic denitrification of nitrifying activated sludge bred by the reject water was due to both the asymmetry of DO transfer in flocs and the metabolism of aerobic denitrifying bacteria.更多还原