Abstract：
In recent years, Moving Bed Biofilm Reactors (MBBRs) have been preferred to conventional processes with suspended biomass. The main reason for this preference is that it can achieve better removal efficiencies than conventional systems with smaller footprints. However, unlocking the full potential of MBBRs in large-scale WWTPs remains challenging in real life. In this study, the performance of three different treatment technologies, Extended Aeration Activated Sludge (EAAS), Hybrid Fixed Bed Biofilm Reactor (HFBBR), and Hybrid Moving Bed Biofilm Reactor (HMBBR), was investigated over a year in a WWTP located in El-Gouna, Egypt. The COD removal efficiencies of the three systems were comparable, with the EAAS achieving 93.5%, HFBBR 94%, and HMBRR 95%. Nevertheless, the NH4 removal efficiency of the EAAS was slightly lower (97.5%) than that of the HFBBR and the HMBBR, that achieved a removal efficiency of 98%. BioWin Software was able to mimic the real case of the WWTP of El-Gouna and critically defined all plant limitations and operational data. Different simulations were modeled to test the hydraulic and organic loading capacities of the three systems under different scenarios and operating conditions. The HMBBR system failed to withstand the increase in organic load because of the biomass sloughing effect and subsequently high TSS loads in the settlers. Biomass sloughing overloaded the settlers and lead to biomass loss in the effluent. As the settleability of the HMBBR sludge was significantly lower than for the HFBBR the TSS loss in the effluent happened that much earlier that the moving carrier application had an adverse effect contradicting with the primary purpose of adding media carriers. Model simulations and data analysis findings were used to recommend the most suitable configuration for upgrading an existing system using the attached growth technique with all kinetic parameters and operational conditions. The recommended configuration focuses mainly on the separation of plastic media in a compartment with a very low hydraulic retention time to absorb the incoming shock load.
摘要：
近年来,移动床生物膜反应器(MBBR)已经优于具有悬浮生物质的常规方法。这种偏好的主要原因是它可以实现比具有较小占地面积的常规系统更好的去除效率。然而,在现实生活中，释放大规模WWTP中MBBR的全部潜力仍然具有挑战性。在这项研究中,三种不同处理技术的性能，延长曝气活性污泥（EAAS），混合固定床生物膜反应器(HFBBR),和混合移动床生物膜反应器（HMBBR），在位于El-Gouna的污水处理厂进行了一年的调查，埃及。三个系统的COD去除效率相当，EAAS达到93.5%，HFBBR94%，HMBRR95%。然而，EAAS的NH4去除效率略低于HFBBR和HMBBR(97.5%),达到98%的去除效率。BioWin软件能够模仿El-Gouna的WWTP的真实案例，并严格定义了所有工厂限制和运营数据。对不同的模拟进行了建模，以测试三种系统在不同场景和运行条件下的水力和有机负载能力。HMBBR系统无法承受有机负荷的增加，因为生物质脱落效应以及随后在沉降器中的高TSS负荷。生物质脱落使沉降器过载，并导致废水中的生物质损失。由于HMBBR污泥的沉降性明显低于HFBBR，因此废水中的TSS损失发生得更早，以至于移动载体的应用具有不利影响，与添加介质载体的主要目的相矛盾。使用模型模拟和数据分析结果来推荐最合适的配置，以使用具有所有动力学参数和操作条件的附加生长技术来升级现有系统。推荐的配置主要集中在具有非常低的液压停留时间的隔室中的塑料介质的分离，以吸收进入的冲击载荷。
