Research Activities on the Identification of Secondary Energy Resources in the WWTPs and in the Biogas Plants

The costs related to the energy used in WWTPs represent the major contributor to the final price of the wastewater treatment services. The results that are presented in the current paper are summarising a professional approach in implementing an eco-innovative solution for the identification of secondary energy resources and improvement of energy efficiency in WWTPs. The main focus in the current paper has been concentrated on treatment of the wastewater sludge.