| 氧化沟不同曝气模式对氮磷去除性能的优化与比较 |
| 摘要点击 2091 全文点击 1240 修订日期：2011-08-10 |
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| 中文关键词 氧化沟 分点曝气 分段曝气 分区 氮 磷 |
| 英文关键词 oxidation ditch point aeration step aeration partitions nitrogen phosphorus |
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| 中文摘要 |
| 采用轮流搅拌-曝气SBR系统模拟氧化沟的运行方式,探讨分点曝气和分段曝气对氮磷的去除效果.结果表明,在供气量相同的条件下,分点曝气系统溶氧效率高,一个循环的好氧区比分段曝气系统长,但是分段曝气溶解氧(DO)的有效利用率(用于除氮除磷)高,二者硝化能力相当,氨氮(NH4+-N)去除率分别为96.68%和97.03%,硝化菌活性(以NH4+-N/MLVSS计)分别为4.65和4.66 mg·(g·h) -1.在缺氧区和好氧区比例皆为1时,分点曝气在2、4、7个分区时总氮(TN)去除率分别为60.14%、47.93%和33.7%; 总磷(TP)去除率分别为28.96%、23.75%和24.31%,即分区越少,对TN和TP的去除皆有利,但是更利于TN的去除; 而分段曝气只有1个分区,其TN和TP的去除率分别为64.21%和49.09%,分段曝气对氮磷的去除效果优于分点曝气,但对提高TP的去除率更有利.对于分段曝气,在满足硝化效果的前提下,增大缺氧区与好氧区的比例,氮磷的去除效率增加.当缺氧区与好氧区的比例由1∶1增大至1.8∶1,其TN和TP的去除率分别提高到73.94%和54.18%.继续增加缺氧区的比例,将影响硝化和运行的稳定,从而影响氮磷的去除效果. |
| 英文摘要 |
| The oxidation ditch operation mode was simulated by sequencing batch reactor (SBR) system with alternate stirring and aeration. The nitrogen and phosphorus removal efficiencies were investigated in two different aeration modes: point aeration and step aeration. Experimental results show that oxygen is dissolved more efficiently in point aeration mode with a longer aerobic region in the same air supply capacity, but dissolved oxygen (DO) utilization efficiency for nitrogen and phosphorus removal is high in step aeration mode. Nitrification abilities of the two modes are equal with ammonia-nitrogen (NH4+-N) removal efficiency of 96.68% and 97.03%, respectively. Nitrifier activities are 4.65 and 4.66 mg·(g·h) -1 respectively. When the ratio of anoxic zones and the aerobic zones were 1, the total nitrogen (TN) removal efficiency of point aeration mode in 2, 4 or 7 partitions was respectively 60.14%, 47.93% and 33.7%. The total phosphorus (TP) removal efficiency was respectively 28.96%, 23.75% and 24.31%. The less the partitions, the higher the nitrogen and phosphorus removal efficiencies, but it is in more favor of TN removal. As for step aeration mode with only one partitioning zone, the TN and TP removal efficiencies are respectively 64.21% and 49.09%, which is better than in point aeration mode, but more conducive to the improvement of TP removal efficiency. Under the condition of sufficient nitrification in step aeration mode, the nitrogen and phosphorus removal is better with the increase of anoxic zone. The removal efficiencies of TN and TP respectively rose to 73.94% and 54.18% when the ratio of anoxic zones and the aerobic zones was increased from 1∶1 to 1.8∶1. As the proportion of anoxic zones was enlarged further, nitrification and operation stability were weakened so as to affect the nitrogen and phosphorus removal efficiencies. |
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