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Investigation into the Contamination of Soil with Multiple Components in the Vicinity of Municipal Solid Waste Landfills

100%

Bereziuk O. , Pashechko M. , Savulyak V. , Kalda G. , Prus A.

tom Vol. 25, nr 6

206--213

Here determination of the level dimensions regularity of the multicomponent contamination zones (by heavy metals and petroleum products) of the soils adjacent to the municipal solid waste landfill. The dependences of the mercury, copper and zinc concentrations in the soil on the distance to the landfill of municipal solid waste were determined, similar dependence was specified for petroleum products for a distance of up to 500 m. The research employed the regression analysis technique for investigating single-factor experiments and other paired patterns. The selection of a suitable function was based on commonly utilized options, determined by the criterion of achieving the maximum correlation coefficient value. Regression analyses were conducted by employing linearizing transformations, facilitating the conversion of non-linear regularities into linear forms. Graphical dependences, describing the change in the concentrations of individual soil pollutants with the distance from the municipal solid waste landfill have been built, they enable to demonstrating the satisfactory convergence of theoretical outcomes with empirical observations was achieved. The level regularity of multicomponent soil contamination (with petroleum products and heavy metals) at the distance from the municipal solid waste landfill has been obtained, it’s required for determining the dimentions of the zones of multicomponent soil contamination. Applying the method of iterations, the dimensions of the multicomponent contamination zones (with petroleum products and heavy metals) of the soils, adjacent to the landfill of municipal solid waste have been determined: very heavy pollution–22.93 m, heavy pollution–81.77 m, average pollution–474.9 m from the foot of the landfill.

Study of Performance of a Vibrating Machine for Cleaning Contamination of Machine Parts with a Submersed Pulsating Jeam with Solid Particles

86%

Hordieiev A. , Kalda G. , Prus A. , Tkachuk V. , Hordieiev O. , Kupiec B.

Advances in Science and Technology. Research Journal

2023

tom Vol. 17, no 6

108--115

The work presents an innovative design of a vibrating machine for cleaning pollution with a pulsating immersed jet with solid particles and analytically obtained the dependence of the mass productivity of the machine on the design parameters of the machine and the modes of operation of the vibration drive. The research results show that the optimal oscillation frequency of the machine drive lies in the range from 13 to 14 Hz with an amplitude of oscillations of 2 mm and a ratio of the diameter of the nozzle to the diameter of the pulsation chamber of 1:10. The conducted studies of the effectiveness of cleaning showed that mass wear of metal balls and changes in the roughness of the base of the sample are practically not observed due to the occurrence of minor stresses on the surface of the sample elastic character. As a result of the study of the efficiency of cleaning model pollution, it was found that increasing the angle of attack of a pulsating immersed jet with metal balls from 900 to 1250 leads to an increase in the efficiency of cleaning. The analysis of the appearance of the surface of model pollutants confirmed the main theoretical assumptions about the mechanical nature of the interaction of a submerged pulsating jet of liquid with solid particles with pollution and showed the effectiveness of the method of cleaning pollution with a pulsating submerged jet of liquid with solid particles.