College of Civil Engineering and Architecture, Zhejiang University of Technology, Hangzhou 310014, Zhejiang, China; College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China.
College of Civil Engineering and Architecture, Zhejiang University of Technology, Hangzhou 310014, Zhejiang, China.
J Environ Sci (China). 2016 Dec;50:32-37. doi: 10.1016/j.jes.2016.03.019. Epub 2016 Apr 28.
Removing nitrogen from wastewater with low chemical oxygen demand/total nitrogen (COD/TN) ratio is a difficult task due to the insufficient carbon source available for denitrification. Therefore, in the present work, a novel sequencing batch biofilm reactor (NSBBR) was developed to enhance the nitrogen removal from wastewater with low COD/TN ratio. The NSBBR was divided into two units separated by a vertical clapboard. Alternate feeding and aeration was performed in the two units, which created an anoxic unit with rich substrate content and an aeration unit deficient in substrate simultaneously. Therefore, the utilization of the influent carbon source for denitrification was increased, leading to higher TN removal compared to conventional SBBR (CSBBR) operation. The results show that the CSBBR removed up to 76.8%, 44.5% and 10.4% of TN, respectively, at three tested COD/TN ratios (9.0, 4.8 and 2.5). In contrast, the TN removal of the NSBBR could reach 81.9%, 60.5% and 26.6%, respectively, at the corresponding COD/TN ratios. Therefore, better TN removal performance could be achieved in the NSBBR, especially at low COD/TN ratios (4.8 and 2.5). Furthermore, it is easy to upgrade a CSBBR into an NSBBR in practice.
用低化学需氧量/总氮（COD/TN）比的废水去除氮是一项艰巨的任务，因为用于反硝化的可用碳源不足。因此，在本工作中，开发了一种新型序批式生物膜反应器（NSBBR），以增强低 COD/TN 比废水的脱氮能力。NSBBR 分为两个单元，由垂直隔板隔开。在两个单元中交替进行进料和曝气，同时形成富底物的缺氧单元和底物不足的曝气单元。因此，提高了进水碳源用于反硝化的利用率，与传统 SBBR（CSBBR）运行相比，TN 去除率更高。结果表明，在三个测试的 COD/TN 比（9.0、4.8 和 2.5）下，CSBBR 分别去除了高达 76.8%、44.5%和 10.4%的 TN。相比之下，在相应的 COD/TN 比下，NSBBR 的 TN 去除率分别可达 81.9%、60.5%和 26.6%。因此，NSBBR 可以实现更好的 TN 去除性能，尤其是在低 COD/TN 比（4.8 和 2.5）下。此外，在实际中，将 CSBBR 升级为 NSBBR 很容易。
