A greywater treatment and reuse technology based on a living ecosystem, which is integrated into a hotel is presented. Benefits include considerable water savings, optical enhancement of the premises, clear green image, improved local microclimate, and reduced ecological footprint. The Vertical Ecosystem (VertECO) consists of an indoor constructed wetland, combining sub-surface horizontal water flow with stage-wise vertical flow. Plants function in symbiosis with rhizosphere microorganisms providing remarkable water cleaning abilities. The unit can be located either indoors or outdoors and is designed to be placed on walls (interior/exterior). Pollution abatement in the range of 90% or higher is achieved, with the effluent being clear, odorless water. The effluent meets regulatory quality standards for several reuses, including garden irrigation, golf course irrigation, toilet flushing, and others. Water savings of 40%-50% can be achieved. Operation costs are much lower than the costs of fresh tap water. Data showing the cleaning performance of the unit is presented, as well as environmental Life Cycle Assessment (LCA) data, which points toward a favorable ecological footprint when compared to current common water management practice in touristic resorts and municipalities.

A horizontal flow wetland (HF) was integrated, in a cascading vertical setup (vertECO), in a Mediterranean tourist facility for decentralized treatment of real low load greywater streams. 15 different plant species were tested in LECA substrate at three different hydraulic retention times (HRTs: 1.9, 1.4 and 1.0 days) with additional *Revised Manuscript Click here to view linked References #" " hydrochlorothiazide, sulfamethoxazole and salbutamol could not be reduced by more than 30%. Statistically significant differences were found at different HRTs for acetaminophen, atenolol, ibuprofen, ethylparaben, TCPP and TBEP (p < 0.05). Conversely, most of the evaluated micropollutants were consistently removed without apparent influence from temperature.