Plant for the industial

sewage treatment

Niagara developed a chemical-physical-biological plant for the disposal of liquid industrial waste; the operative potentiality is 140,000 tons per year and the Company’s Quality System works according to UNI EN ISO 9001 - UNI EN ISO 14001 and OHSAS 18001. An inside laboratory tests the samples provided by the customers to verify waste compatibility with the plant’s disposal technologies; furthermore, chemical analysis reveals some possible pre-treatment needs to be performed in suitable discontinuous reactors. The waste is drained into homogenization tanks to be subjected to a first screening and degritting phase. Next, it is sent to a clarification bed for the separation process of the mudflow; the liquid component is submitted to chemical reagents and to a clarification period for the separation of sludge obtained during the treatment.
The sewage is then run into a homogeneization receiver, in which it is directed to the three-phase biological treatment: oxidation, aerobic nitration, denitrification.
Additionally, as final finishing off, the sewage goes through an oxidation process with ozone and – finally – is set under pressure filtration with sand and activated carbon. Once all the processes have been completed, the outflow drains into surface water in compliance with the laws in force. The liquid sludge obtained from the clarification is piped into a specific mud treatment line, which collects the sedimentation slimes from the chemical-physical activities and the mud produced by the biological treatment. At this stage, they are mixed and, by means of chemical and pressing processes, they are solidified (filter-pressed sludge) to be either disposed of, in suitable class landfills, or sent to external installations to undergo specific stabilization processes.