【作者】 黄利彬；

【导师】 彭党聪；

【作者基本信息】 西安建筑科技大学 ， 环境工程， 2007， 硕士

【摘要】 本文以西安市北石桥污水净化中心城市污水为处理对象，采用连续式分段进水A／O工艺和SBR分段进水工艺进行试验，探讨了两种工艺对有机污染物的去除效果、脱氮特性及反应器内各组分沿程变化规律。连续式A／O反应器运行条件如下：采用四段进水，进水总流量为160L／h，各段流量分配比例为4∶3∶2∶1，各级缺氧区与好氧区的容积比均为1∶3，污泥回流比为50％，总水力停留时间为7.5h，污泥龄约为12d。对应的总化学需氧量、溶解化学需氧量、氨氮、总氮和总磷的平均去除率分别为90.31％、81.53％、97.24％、66.29％和80.13％。SBR反应器的运行条件如下：采用三段进水，每个周期处理水量为5L，进水比例为4∶3∶3，污泥龄约为12d，总水力停留时间为18h。对应的总化学需氧量、溶解化学需氧量、氨氮、总氮和总磷的去除率分别为91.05％、85.03％、97.79％、68.29％和83.73％。采用间歇试验法测定了连续式A／O反应器活性污泥混合液的耗氧速率、最大比硝化速率和最大比反硝化速率，结果分别为35.09mgO₂／gMLVSS·h、5.81mgNH₃-N／gMLVSS·h和21.22mgNO₃^--N／gMLVSS·h。表明活性污泥具有较高的活性。试验结果表明，两种分段进水工艺对有机物、氮和磷等均具有良好的去除效果。但是由于两种工艺的水力停留时间有所差别，SBR处理效果稍好于连续式A／O反应器。更多还原

【Abstract】 The continuous influent step-feed anoxic/oxic reactor and step-feed Sequencing Batch Reactor were conducted for treating municipal wastewater at Beishiqiao sewage purification center in Xi’an. The removal effect of the organic matter, the characteristic of nitrogen removal and transformations of various pollutants in the reactor is mainly discussed in this study.The results of continuous influent anoxic/oxic reactor as follows: The design influent flow is 160L/h and splitting to four points in the ratio of 4:3:2:1, the A/O volume ratio is set on 1:3 for each pass. 50% rate of return activated sludge （RAS）, 7.5-hour hydraulic retention time （HRT）and 12-day sludge retention time （SRT）. With the conditions, the average removal efficiency of TCOD, SCOD, NH₃-N, TN and TP can reach to90.31%, 81.53%, 97.24%, 66.29% and 80.13%.The results of sequencing batch reactor as follows: The design influent flow is 5L in a period and splitting to three points in the ratio of 4:3:3 and 12-day sludge retention time（SRT）, 18-hour hydraulic retention time （HRT）. Under the conditions, the average removal efficiency of TCOD, SCOD, NH₃-N, TN and TP can reach to 91.05%, 85.03%, 97.79%, 68.29% and 83.73%.Batch experiments are operated for the continuous influent anoxic/oxic reactor to determine the specific oxygen uptake rate, the specific ammonium uptake rate and the specific denitrification rate. The results are 35.09 mgO₂/gMLVSS·h, 5.81 mgNH₃-N/gMLVSS·h and 21.22 mgNO₃^--N/gMLVSS·h respectively. They show that the activated sludge has high activity in the mixed liquid.In conclusion, the two types of step-feed process are an effective technology of nutrient removal for municipal wastewater treatment. Because of the differences in HRT between the continuous influent step-feed anoxic/oxic reactor and step-feed Sequencing Batch Reactor, the removal efficiency of the latter is better than that of the former.更多还原