OVERVIEW OF WASTEWATER SLUDGE DISINFECTION METHODS

Abstract

The widespread use of the most economical biological method of wastewater treatment from organic and inorganic anthropogenic toxicants (petroleum products, pesticides, surfactants, heavy metals, chemical weapons detoxification products) in modern conditions has 
led to a new environmental problem – the need to find methods for neutralizing excess sludge and sediments from heavy metals (copper, lead, chromium, arsenic, mercury, zinc, etc.), high concentrations of which do not allow the use of silts and sediments in agriculture. The amount of urban wastewater and sewage sludge (OSW) is constantly growing, and at the same time the 
problems associated with their rational, cost-effective and environmentally safe disposal are becoming more acute. Significant areas are occupied for their storage (deposit), and environmentally safe processing and storage require the involvement of significant material and 
technical resources.  The article presents an analysis of methods and technologies for disinfection of sewage sludge. Qualitatively new methods of wastewater sludge dewatering are being proposed and already used 
are being improved. Sediments formed during wastewater treatment (sand from sand traps, sediment from primary sedimentation tanks, excess activated sludge, etc.) must be treated for the purpose of dehydration, stabilization, odor reduction, disinfection, improvement of physical and mechanical properties, ensuring the possibility of their environmentally safe disposal or placement 
(storage and/or burial) in the environment.