The purpose of author's researches - assessment of level of pollution by fine particles (PM10, PM5, PM2.5, PM1, PM0.5) of atmospheric air in territories of parks in Volgograd. Due to the fact that the parks operate year-round, research was carried out in the winter, spring-autumn and summer periods of the year. Research, in particular, was carried out in two parks located in the central part of Volgograd, where there are no industrial enterprises, and are adjacent to one of the largest city highways. Analysis of the particulate composition and mass concentration of fine dust in atmospheric air was performed using microscopic analysis and using Handheld 3016. At the same time, the temperature and relative humidity of the air, wind speed and atmospheric pressure were measured. Measurements were made in places with the largest concentration of visitors to the park at an altitude of 0.5 m, 1 m and 1.5 m, i.e. in the breathing zone of children, adolescents and adults. In the air environment on the territory of the surveyed park zones of Volgograd, there is no excess of the MPC in the atmospheric air for suspended matter RI2.5 observed, but there are cases of significant excess of the average annual and average daily MPC for RM10 particles.

Keywords: atmospheric air, park area, fine dust, maximum permissible concentration (MAC), dispersed composition

Due to the peculiarities of the technology, in gypsum production preference is given to dry cleaning of emissions into the atmospheric air from dust. At the same time, dust cleaning systems are arranged in multistage with installation of cyclones at the first stage, bag filters or electric precipitators - at the second. According to the results of research, it was found that the efficiency of cyclones in collecting gypsum dust is 70-75%, precipitators - 97.6-98.5%, and is insufficient neither to ensure sanitary and hygienic conditions, nor to reduce production losses. Based on the results of the studies, the median diameters of dust transported in the engineering and environmental system were determined: after the gypsum boiler - 25-58 microns; after the cooler - 38 μm; after the mill ring - 21 μm; before the electrostatic precipitator - 28 μm. To increase the efficiency of the dust cleaning system, it is proposed to replace the cyclone installed before the electrostatic precipitator with a block of two parallel dust collectors on opposite swirled flows. It has been experimentally established that the effectiveness of such a solution is 88.9-94.9%. Based on the results of studies and statistical processing of the data obtained, it was established. that the main influence on the efficiency of the dust collector unit is exerted by the relative volumetric flow rate in the flow sucked in the lower part of the main VZP apparatus. The highest efficiency values are achieved with its values 0.15-0.22. It was also established that the highest efficiency values are noted in the case when the diameter of the auxiliary VZP device is 2 times smaller than the diameter of the main one. Such mode and design parameters should be recommended for efficient operation of the plant.

Keywords: cyclone, electrostatic precipitator, dust collector at opposite twisted flows, dust collection efficiency, engineering and ecological system

The article describes the design solution of a system for dedusting emissions into the atmospheric air using vortex inertial devices with counter-swirling flows (CSF) and a separator-concentrator. An approach to evaluating the efficiency of such a dust collection system is described. Analytical dependencies and a flowchart for calculating the efficiency of the system are presented.

Keywords: vortex inertial dust collector with counter swirled flows (CSF), separator-concentrator, dust collecting system, dust cleaning efficiency

In article the qualitative structure of emissions of pollutants in the atmosphere of St. Petersburg is considered and also dynamics of change of volumes of emissions of solid substances on air environment of the city is analyzed

Keywords: emissions of pollutants, atmospheric air, the solid (weighed) substances, stationary sources, non-stationary sources

Based on the results of theoretical and experimental studies, the necessity of taking into account the “overshoot effect of large particles” in inertial devices with small diameters is justified when assembling dust collection systems with devices of different sizes.

Keywords: vortex inertial dust collector with counter-swirling flows (CTF), suction from the bunker, differently polluted flows, aerodynamic resistance, overshoot

The article describes solutions aimed at improving the efficiency of dust collection systems with vortex inertial devices on the opposite swirling flows. The proposed design solutions are designed for the production of various building materials.

Keywords: vortex inertial dust collector with counter-swirling flows (VZP), suction from the bunker, mixed-flow flows

The sorption capacity of some types of dust in the production of building materials, structures and products. For example, cement and wood dust being suspended in the air of the working area or in the air, absorbs substances higher hazard class.

Keywords: cement dust, wood dust, sorption capacity, fractional composition, hazard class

In article results of natural researches on an assessment of fractional structure of particles are given in organized and unorganized dust emissions from stationary sources at the entities of the woodworking industry

Keywords: dust, dust emissions, stationary source of emissions, concentration, fractional structure, fine particles

In article the analysis of technological processes of repair construction works as sources of formation of fine dust is carried out. Results of pilot studies according to fractional composition and concentration of dust in urban air environment around carrying out such works are given

Keywords: dust, dust emissions, concentration, fractional structure, fine particles

In article results of pilot studies according to influence of dust emissions in the atmosphere from sources of asphalt concrete plants on concentration and fractional composition of dust are given in atmospheric air. The obtained data testify to insufficient efficiency of actions for decrease in the pylevydeleniye in environment applied now at the considered enterprises. The assessment of necessary fractional efficiency of a pyleulavlivaniye in the conditions of the operating production is carried out.

Keywords: dust, dust emissions, organized source of emissions, concentration, fractional structure, fine particles, fractional efficiency

In article some technical solutions in a design of vortex inertial dust collectors with the counter twirled flows are described. These solutions are proposed by creative staff of the Volgograd state of Architecture and Civil Engineering

Keywords: dust collectors with the counter twirled flows, a vortex collector- dust collector, the two-level dust collector, fine particles

The results of experimental studies to assess the effectiveness of the proposed installation of the dust swirling devices HICP designed to reduce dust emissions in the production of aerated concrete.

Keywords: efficiency, leakage, suction from the hopper, speed, pressure loss, the generalized coefficient

A system of purifying from dust for keramzit production and for another branches of industry was described. This system consists of apparatus with twisted flows.

Keywords: system, purifying from dust, keramzit

The overall effectiveness of actual multilevel dust-collecting systems as random variable is proved.

Keywords: Multilevel dust-collecting systems, overall effectiveness, random variable

The level of dust pollution appearing during the dump of cars loaded with crushed limestone is defined. The data on the composition of the dust particles dispersed into the air in the working area during the cars loaded with rubble dump is obtained. The scheme of experimental-industrial dedusting ventilation and the results of its tests are described.

Keywords: system of dedusting ventilation, rubble, dust pollution