| Popis: |
Urban wastewater treatment is one of the most important challenges in villages of southern Spain. This is especially outstanding in arid and semiarid regions in which wastewater are discharged to temporary streams or wetlands. The treatment plant of the Fuente de Piedra village discharges its wastewater, passing previously through four semi-natural wetlands, into Fuente de Piedra Lake, a RAMSAR wetland. In summer 2016, a very dry year, water affluent to Fuente de Piedra was limited to wastewater plant effluents without dilution. In order to study the natural assimilation capacity of the wetland system, four key points were sampled. Physico-chemical and biological indicators were analyzed (temperature, pH, conductivity, total phosphorous, total nitrogen, bacteria, phytoplankton and zooplankton). The results show very high chlorophyll a concentration (>500 mg/l) at the water inlet, which decreased to concentration lower than |
