Delta Higher Institute for Engineering and Technology, Mansoura, Egypt.
Public Works Department, Faculty of engineering, Mansoura University, Mansoura, Egypt.
Water Environ Res. 2021 Sep;93(9):1700-1713. doi: 10.1002/wer.1556. Epub 2021 Apr 1.
A conventional sequencing batch reactor (SBR) was upgraded using fixed biofilm carriers with a specific surface area around 18 m m . The upgraded SBR was investigated to remove phenol from high strength wastewater operated under various operational conditions. The operational conditions used were variable volume exchange ratio (VER) up to 75%, hydraulic retention time (HRT) from (10.7-21.3 hr), aeration time (from 2 to 8 hr), and initial phenol concentration up to 600 mg L . It was found that the upgraded SBR increased the removal efficiencies of biological oxygen demand (BOD ), chemical oxygen demand (COD), and total suspended solids (TSS) by about 10% using high strength wastewater without phenol compared to SBR. Furthermore, the removal rate of phenol for the upgraded SBR was higher than conventional SBR by about 18% at 600 mg L of initial phenol concentration under the same operational conditions. Compared to the conventional SBR, the upgraded version reduced the aeration step by 25% and achieved higher removal efficiency of phenol. Moreover, it reduced the excess sludge by about 23% and enhanced its properties by lowering the sludge volume index (SVI) by about 33%. PRACTITIONER POINTS: Upgrading conventional SBR by adding biofilm carriers is necessary for wastewater treatment with high strength wastewater. The upgraded SBR has a higher resistance toward phenol compound due to the presence of the attached biofilm. The upgraded SBR enhances sludge settling properties, decreases the amount of excess sludge, and also reduces the start-up period. The number of cycles per day by upgraded SBR was more than the conventional SBR by 15%. The upgraded SBR is an effective system and has good operational stability.
传统序批式反应器（SBR）通过添加比表面积约为 18mm 的固定生物膜载体进行升级改造。在各种操作条件下，使用该升级后的 SBR 从高浓度废水中去除苯酚。所使用的操作条件包括可变体积交换比（VER）高达 75%、水力停留时间（HRT）（10.7-21.3 小时）、曝气时间（2-8 小时）和初始苯酚浓度高达 600mg/L。结果发现，与 SBR 相比，使用不含苯酚的高浓度废水，升级后的 SBR 可将生物需氧量（BOD）、化学需氧量（COD）和总悬浮固体（TSS）的去除效率提高约 10%。此外，在相同的操作条件下，当初始苯酚浓度为 600mg/L 时，升级后的 SBR 对苯酚的去除率比传统 SBR 高约 18%。与传统 SBR 相比，升级后的 SBR 可减少 25%的曝气步骤，并实现更高的苯酚去除效率。此外，它还减少了约 23%的剩余污泥，并通过降低污泥体积指数（SVI）约 33%来改善其性质。
用生物膜载体对传统 SBR 进行升级改造，是处理高浓度废水所必需的。由于附着生物膜的存在，升级后的 SBR 对苯酚化合物具有更高的抵抗力。升级后的 SBR 增强了污泥沉淀性能，减少了剩余污泥量，并缩短了启动时间。升级后的 SBR 每天的循环次数比传统 SBR 多 15%。升级后的 SBR 是一种有效的系统，具有良好的运行稳定性。
