Advances in Environmental Research. Volume 76 first aims to review the microbial communities of urban soils, specific factors that act in the urban environment, and the microbes response to these impacts. Following this, the authors discuss the operation of biological wastewater treatment plants, including aspects such as effective solid-liquid separation, pretreatment systems and operating strategies. More specifically, the design of software solutions developed for the wastewater treatment plant in Facai, Craiova, Romania is discussed. In the subsequent paper, the authors examine eight geomorphosites that can contribute to promoting scientific tourism, and that must be preserved from environmental degradation, especially from mining exploitation and urban expansion. The concluding study focuses on the northern sector of Fuerteventura, where the urban development of Corralejo, El Cotillo, Lajares, Villaverde and La Oliva has irreversibly deteriorated a number of volcanoes and dunes of high landscape value.