PROBLEMS AND SOLUTIONS OF THE SILT SLUDGE UTILIZATION ISSUES AT WASTE TREATMENT FACILITIES OF NUR-SULTAN CITY

Аннотация

Effective management of wastewater sludge is currently one of the most pressing environmental
problems in Nur-Sultan city, which becomes more acute year by year and requires immediate solution. Wastewater
sludge is almost completely stored at the treatment facilities, which turns them into a source area of bacteriological
and toxicological hazard. For this reason, the most urgent problem now is the development of new sustainable and
zero waste technologies that can effectively expedite the reduction of silt sludge and lead to a significant decrease in
their final volume. This article analyzes various methods of sludge disposal. It is shown that of all possible
technology options with admissible environmental impact and the best economic indicators, the most acceptable is
the method of thermo-catalytic oxidation of wastewater sludge in a semi fluidized bed of the catalyst, the use of
which can fundamentally change the situation with the sludge disposal. Also, the article studied the composition and
carried out measurements of silt sludge contamination with heavy metals and oil products at wastewater treatment
plants of Nur-Sultan city. It is pointed out that the LOC for the TPH-in-soil is 1.5 g/kg, from which it can be
concluded that there is a significant excess in the wastewater sludge for this indicator, and studies for the heavy
metals presence in the wastewater sludge showed that sediments can have a toxic effect and are classified as 4 class
of hazard.