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题名: 一体化 A2/O-MBR曝气能效及运行特性研究
作者: 赵曙光
学位类别: 博士后
答辩日期: 2014-05
授予单位: 中国科学院研究生院
授予地点: 北京
导师: 樊耀波
关键词: 一体化,构型,曝气能耗,气水混合流聚集器,脱氮,MBR,A2/O,integration, A2/O-MBR, collector of gas-liquid flow, aeration efficiency,denitrification,configuration
学位专业: 环境工程
中文摘要:       基于计算流体力学(CFD)模拟,开发了一种一体化 A2/O-MBR(A2/O-膜生物反应器)。在山西某煤矿生活区污水厂,建立了一套规模为  2-3m3/d的中试装置,以实际生活污水为原水,对该反应器的曝气能效、运行特性、膜污染控制、技术经济可行性进行了研究,取得研究结果如下:
    一体化 A2/O-MBR是在普通曝气池内加装气水混合流聚集器将反应池分隔成不同反应区而构成。CFD模拟结果表明,在结构上反应器上升区与下降区宽度之比1/5优于1/2。测试了反应器加装气水混合流聚集器前后的流速分布,比较了两者的曝气能效。曝气强度为 3.5m3/h时的膜区流速,可达到普通曝气池曝气强度7.5m3/h流速的1.5倍。即在一体化A2/O-MBR中,较低的曝气强度可得到较高的膜区流速,从而可降低膜冲洗曝气能耗,提高曝气能效。
    以实际生活污水为原水,在曝气强度为 3.5m3/h条件下,考察了一体化A2/O-MBR的运行效果。结果表明,系统稳定运行后,CODcr、NH3-N、BOD5平均去除率为 83%、98%和94%,出水 TN、TP平均浓度为  10.7 mg/L和  0.5 mg/L,满足了《城镇污水处理厂污染物排放标准》(GB18918-2002)一级标准 A的要求;反应器具有一定的抗冲击负荷能力;系统中污泥浓度增长较慢,污泥沉降性能良好  (SV30<30%);系统在104d运行时间里跨膜压差处在1.3-30.9 kPa范围;体外膜污染化学清洗效果显著,有利于  MBR长期稳定运行。
      采用带阀门的穿孔管控制反应器上升区与下降区的循环流量,采用空压机间歇工作,开30s/关3  min,使反应器曝气量由4m3/h渐降为0m3/h周期往复;在该种运行模式和运行条件下,反应器内 DO分布可达到预期好氧、缺氧、厌氧环境条件;此时,出水TN平均浓度小于10mg/L,CODcr、BOD5、NH3-N、TP优于《城镇污水处理厂污染物排放标准》(GB18918-2002)一级 A标准。
    对一个 100m3/d规模一体化  A2/O-MBR进行了技术经济分析。结果表明,工程吨水投资为 5000 yuan/t、吨水运行成本为 0.45 yuan /t、吨水能耗为 0.41 kWh /t。
英文摘要:       A new integrated A2/O-MBR(membrane bioreactor) was innovated and the width ratio of up zone  to  down   zone  was  determined  based   on  the  simulation  of  CFD(Computational   Fluid Dynamics).A pilot setup (2-3m3/d)  of the integrated A2/O-MBR was established  in a waste water treatment plant  at a  residental district  in Jiexu, Shanxi  Province. With  the sewage waste  water as influent, the experiment was performed to examine the pollutant  removal, the energy efficiency, the membrane fouling and the operation cost at the pilot setup of the integrated A2/O-MBR. The  results are showed as follows:
      The width ratio of up zone to down zone of the new MBR 1/5 was better than 1/2, according to the  CFD  simulations   of  the  gas  holdup  distribution,   the  velocity  distribution,  the  turbulence distribution by using the flow vector and the trajectories.
      Two baffles were installed in the aeration tank to  separate the A2/O-MBR into three zones, the anoxic zone, the  anaerobic zone and oxic  zone. As a collector  of gas-liquid flow, the baffles  could enhance membrane  flushing by  the gathered  mixied liquor  in oxic  zone. Under  different aeration intensity,  the energy  efficiencies  were  compared between  the  integration  A2/O-MBRs with  and without the  baffles. The aeration  intensity of the  new integration A2/O-MBR  at 3.5m3/h was  0.45 times of the  aeration intensity in  the normal aeration tank  at 7.5m3/h, while  the liquid flow  rate in membrane zone was 1.5 times that of the normal  aeration tank. The integrated A2/O-MBR could be operated with lower energy consumption because of its lower aeration intensity.
      The integration A2/O-MBR displayed better resistance to shock loads and the  average removal rate of COD、NH3-N were 83%、98% and the average TN、TP in the effluent were 10.7 mg/L and 0.6  mg/L respectively.  The  activated  sludge in  the  integrated  A2/O-MBR  grew slowly  and  the sedimentation was well  as SV30<30%. During 104  days’ performence, trans-membrane pressure (TMP) increased from  1.3 to 30.9  kPa and the membrane  pollution could be  controlled effectively by the off-line chemical cleaning.
      The necessary  DO distribution in  aerobic, anoxic or  anaerobic zones could  be established  by controlling the sludge recycle ratio from up zone to down zone  and by setting the aeration rate from 0 m3/h to 4m3/h in every operation duration for 210 seconds.
      The economic  estimation of the  integration A2/O-MBR with  a capacity of  100m3/d provided the capital  cost of  5000 yuan/t,  the operating  cost of  0.45  yuan/t and  the energy  consumption of 0.41kWh/t.
内容类型: 学位论文
URI标识: http://ir.rcees.ac.cn/handle/311016/34482
Appears in Collections:水污染控制技术研究室_学位论文

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Recommended Citation:
赵曙光. 一体化 A2/O-MBR曝气能效及运行特性研究[D]. 北京. 中国科学院研究生院. 2014.
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