Abstract
Experimental studies on the decontamination and stabilization of sludge sites sediment with calcium oxide treated with disinfectant. The results of the research discovered that the sewage sludge of Voronezh City is safe and can be used as organic fertilizer for growing agricultural plants. Determination of the content of macro-elements of mineral nutrition in the soil and the reaction of its environment showed that the application of organic fertilizers in the form of sludge increases the amount of nitrate nitrogen, exchangeable potassium, mobile phosphorus in the soil compared to the non-fertilized sample. Contemporaneously, the mass fraction of impurities of toxic elements in the soil decreases when the sewage sludge is used as an organic-lime fertilizer.
Highlights
Water management and municipal enterprises in Russia store more than a hundred million tons of organic sediments, not considering waste from livestock complexes
The volume and characteristics of sediments generated at sewage treatment plants can be categorized according to the following characteristics [1-5]: The amount of waste on grates with openings of 16 mm is 8 l/person per year - at a humidity of 80% and a volume weight of 750 kg/m3; Volume of sand retained by sand traps is 0.02–0.03 l/person/day, volume weight-1.5 t/m3, humidity-60%; Volume of floating sediments retained by fat traps or primary sedimentation tanks is 2 l/person per year at a humidity of 60% and a volume mass of 0.6 t/m3; Suspended pollution is retained by primary sedimentation tanks
Voronezh City wastewater sludge treated with CaO is safe and refers to clean soils in accordance with regulatory requirements by its microbiological parameters,. 2
Summary
Water management and municipal enterprises in Russia store more than a hundred million tons of organic sediments, not considering waste from livestock complexes. The sewage sludge is fed to the silt sites for dewatering. Most of the silt sites are overflown and are often located in the residential territory of cities. The volume and characteristics of sediments generated at sewage treatment plants can be categorized according to the following characteristics [1-5]: The amount of waste on grates with openings of 16 mm is 8 l/person per year - at a humidity of 80% and a volume weight of 750 kg/m3; Volume of sand retained by sand traps is 0.02–0.03 l/person/day, volume weight-1.5 t/m3, humidity-60%; Volume of floating sediments retained by fat traps or primary sedimentation tanks is 2 l/person per year at a humidity of 60% and a volume mass of 0.6 t/m3; Suspended pollution is retained by primary sedimentation tanks. The mechanical composition of sediments from primary sedimentation tanks is highly heterogeneous
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