The ecological engineering model of mixing soil layers is an underground filter tank technique that uses natural materials derived from soil (i.e., clay minerals, laterite cinders, etc.) as pollutant adsorbents. The surface of the tank is covered with soil and planted with natural grasses. The technique had high treatment efficiency, with N and P treatment efficiency of 60 - 70 %, due to anaerobic and aerobic mechanisms in the soil layers. The concentration of BOD5 and COD were significantly reduced, ensuring the quality according to QCVN 14-MT:2015/BTNMT column B1. The technique uses completely natural materials, environmentally friendly and low operating costs. This technique is very suitable for households, agencies, schools, restaurants and hotels,... to treat wastewater in order to protect the environment. The technique applied to decentralised sources will reduce the operation capacity of centralised wastewater treatment plants.
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. Farahbakhshazad, N. and G. M. Morrison (1997). Ammonium removal processes for urine in an upflow macrophyte system. Environmental Science & Technology, vol. 31, no. 11, p. 3314 - 3317.
. Khương Thị Hải Yến và cộng sự (2022). Đánh giá hiệu quả xử lý nước thải sinh hoạt tại nguồn phân tán bằng kỹ thuật phối trộn vật liệu có nguồn gốc từ đất. Tạp chí Khoa học Thủy lợi và Môi trường, p. 22 - 25.
. LiaLiang Zhang et al (2011). Adsorption characteristics studies phosphorus onto laterite. J. Chemosphere, vol. 51, p. 98 - 105.
. Moreno, C., N. Farahbakhshazad and G. M. Morrison (2002). Ammonia removal from oil refinery effluent in vertical upflow macrophyte column systems. Water, Air and Soil Pollution, vol. 135, p. 237 - 247.
. Nga. N. T. H, Mori Yuki, Shin - Ichiro Wada (2013). Laterite in Vietnam and their ability for waster water treatment. J. Agriculture, Kyushu University.
. Sato K., Masunaga T., Inada K., Tanaka T., Arai Y., Unno S. and Wakatsuki T. (2005). The development of high speed treatment of polluted river water by the multi - soil - layering method, examination of various materials and structure. Jpn J. Soil Sci. Plant Nutr., vol. 200.
. Sato, K., Iwashima, N., Matsumoto, T., Wakatsuki, T. and Masunaga, T. (2010). Wastewater treatment processes and mechanisms of organic matter, phosphorus and nitrogen removal in a multi - soil - layering system. Proceedings of the 19th World Congress of Soil Science.
. McGraw-Hill (2007). Water and wastewater calculations manual. Chemistry & Biodiversity, vol. 1, p. 1829 - 1841. Retrieved from http://onlinelibrary.wiley.com/doi/10.1002/cbdv.200490137/abstract.
. T. Masunaga et al. (2007). Characteristics of wastewater treatment using a multi soil layering system in relation to wastewater contamination level and hydrolic loading rates. Soil Science and Plant Nutrition, p. 123 - 125.
. T. Attanandana et al. (2007). Treatment of domestic wastewater with a Multi - Soil - Layering (MSL) system in a temperate and a tropical climate.
. Trần Đức Hạ (2002). Xử lý nước thải quy mô vừa và nhỏ. Nhà xuất bản Khoa học và Kỹ thuật.
. Trịnh Xuân Lai (2016). Xử lý nước thải sinh hoạt và công nghiệp theo công nghệ A/O. Nhà xuất bản Xây dựng.
. Tchobanoglous, G, Burton, FL & Stensel, HD. (2003). Wastewater engineering: Treatment and reuse. Fourth edition. McGraw-Hill series in civil and environmental engineering, McGraw-Hill, New York, NY.
. Xin CHEN et al. (2007). Effect of structural difference on wastewater treatment efficiency in Multi - Soil - Layering systems: Relationship between soil mixture. Soil Science and Plant Nutrition, vol. 53, p. 206 - 214.