First Report on Cyanotoxin (MC-LR) Removal from Surface Water by Multi-Soil-Layering (MSL) Eco-Technology: Preliminary Results

Water

卷:13

Nelly Brugerolle de Fraissinette¹  Alexandre Campos¹  Vitor Vasconcelos¹  PedroN. Carvalho²  Abdessamad Hejjaj³  Richard Mugani⁴  Brahim Oudra⁴  RoselinePrisca Aba⁴  Laila Mandi⁴  Naaila Ouazzani⁴ 

[1] CIIMAR, Interdisciplinary Center of Marine and Environmental Research, University Porto, 4099-002 Porto, Portugal;

[2] Department of Environmental Sciences, Aarhus University, 8000 Aarhus, Denmark;

[3] Laboratory of Water, Biodiversity and Climate Change, Faculty of Sciences Semlalia, Cadi Ayyad University, P.O. Box: 2390, 40000 Marrakech, Morocco;

[4] National Center for Studies and Research on Water and Energy, Cadi Ayyad University, P.O. Box: 511, 40000 Marrakech, Morocco;

关键词: multi-soil-layering eco-technology;    cyanotoxins;    microcystin-LR;    water treatment;   

DOI  :  10.3390/w13101403

来源: DOAJ

【 摘 要 】

Cyanobacteria blooms occur frequently in freshwaters around the world. Some can produce and release toxic compounds called cyanotoxins, which represent a danger to both the environment and human health. Microcystin-LR (MC-LR) is the most toxic variant reported all over the world. Conventional water treatment methods are expensive and require specialized personnel and equipment. Recently, a multi-soil-layering (MSL) system, a natural and low-cost technology, has been introduced as an attractive cost-effective, and environmentally friendly technology that is likely to be an alternative to conventional wastewater treatment methods. This study aims to evaluate, for the first time, the efficiency of MSL eco-technology to remove MC-LR on a laboratory scale using local materials. To this end, an MSL pilot plant was designed to treat distilled water contaminated with MC-LR. The pilot was composed of an alternation of permeable layers (pozzolan) and soil mixture layers (local sandy soil, sawdust, charcoal, and metallic iron on a dry weight ratio of 70, 10, 10, and 10%, respectively) arranged in a brick-layer-like pattern. MSL pilot was continuously fed with synthetic water containing distilled water contaminated with increasing concentrations of MC-LR (0.18–10 µg/L) at a hydraulic loading rate (HLR) of 200 L m⁻² day⁻¹. The early results showed MC-LR removal of above 99%. Based on these preliminary results, the multi-soil-layering eco-technology could be considered as a promising solution to treat water contaminated by MC-LR in order to produce quality water for irrigation or recreational activities.

【 授权许可】

Unknown