Saidi Assia, Masmoudi Khaoula, Nolde Erwin, El Amrani Btissam, Amraoui Fouad
Laboratory of Geo-Sciences Applied to Development Engineering (G.A.I.A), University Hassan II, Faculty of Sciences Ain Chock, Km 8 route d'ElJadida. BP 5366 Maarif, Casablanca, Morocco E-mail:
Laboratory of Waste Water Treatment, Center of Water Research and Technologies, technoparck Borj Cedria BP 273, 8020 Soliman, Tunisia.
Water Sci Technol. 2017 Dec;76(11-12):3328-3339. doi: 10.2166/wst.2017.499.
Greywater is an important non-conventional water resource which can be treated and recycled in buildings. A decentralized greywater recycling system for 223 inhabitants started operating in 2006 in Berlin, Germany. High load greywater undergoes advanced treatment in a multistage moving bed biofilm reactor (MBBR) followed by sand filtration and UV disinfection. The treated water is used safely as service water for toilet flushing. Monitoring of the organic matter degradation was pursued to describe the degradation processes in each stage and optimize the system. Results showed that organic matter reduction was achieved for the most part in the first three reactors, whereas the highest reduction rate was observed in the third reactor in terms of COD (chemical oxygen demand), dissolved organic carbon and BOD (biological oxygen demand). The results also showed that the average loading rate entering the system was 3.7 kg COD/d, while the removal rate was 3.4 kg COD/d in a total bioreactor volume of 11.7 m³. In terms of BOD, the loading rate was 2.8 kg BOD/d and it was almost totally removed. This system requires little space (0.15 m²/person) and maintenance work of less than one hour per month and it shows operational stability under peak loads.
中水是一种重要的非传统水资源，可在建筑物中进行处理和循环利用。2006年，德国柏林一套为223名居民服务的分散式中水回收系统开始运行。高负荷中水在多级移动床生物膜反应器（MBBR）中进行深度处理，然后进行砂滤和紫外线消毒。经处理后的水可安全用作马桶冲水的服务用水。对有机物降解情况进行监测，以描述各阶段的降解过程并优化该系统。结果表明，大部分有机物的减少在前三个反应器中实现，而从化学需氧量（COD）、溶解有机碳和生化需氧量（BOD）来看，第三个反应器的去除率最高。结果还表明，进入系统的平均负荷率为3.7千克COD/天，而在总生物反应器体积为11.7立方米的情况下，去除率为3.4千克COD/天。就BOD而言，负荷率为2.8千克BOD/天，且几乎被完全去除。该系统占地空间小（0.15平方米/人），每月维护工作少于一小时，并且在高峰负荷下显示出运行稳定性。
