EFFICIENCY OF FOAM WASTEWATER DISPOSAL

Получены динамические характеристики производительности пеногенератора от времени в сточной воде при различных концентрациях некаля, являющегося поверхностно-активным веществом, и переменной глубине погружения сопла. The dynamic characteristics of the foam generator performance as a function of time in the waste water at different concentrations of non-crystal, which is a surfactant, and variable nozzle immersion depth are obtained.

Numerical Simulation of Air Entrainment Performance of a Foam Generator Used for Dust Control in Coal Mines

Mine dust is one of the most serious environmental hazards in the coal mining process. This paper introduces a numerical simulation of a novel foam generator used for dust control in coal mines. The amount of foam generated by this device significantly depends on the amount of air entrainment. Therefore, a computational fluid dynamics (CFD) method was used to study three influencing factors, namely, throat-nozzle distance, mixing throat length, and the contraction angle of the suction chamber. The predicted values by the CFD simulation proved to be in good agreement with the experimental data. The results revealed that the air entrainment reached its maximum when the ratio of throat-nozzle distance to mixing throat length was 2/3. The optimum values of the throat ratio (its length to diameter) and the contraction angle of the suction chamber were obtained at 20 and 5°, respectively. This research provides essential guidance in the geometric parameter design of the self-suction type foam generator, which has the advantage of negating the need for compressed-air pipelines and having high reliability, compared to traditional foam generators.

REDUCTION OF EMPLOYMENT OF FORMULA WORKING BY USING LOCAL FILL-ERS AND WASTE OF PRODUCTION

Objectives.The purpose of this study is to study the increase in turnover of formwork and reduce the complexity of formwork for monolithic foam concrete by regulating its properties through the optimal use of local aggregates of the Republic of Daghestan and industrial waste. In particular, the experimental work used cement grade M500, silica filler - deposits of quartz sand in Kumtorkala district of the Republic of Daghestan with a low module of size, various synthetic foaming agents, perlite sand, ground expanded clay sand (Kizilyurt, Republic of Daghestan),stone crushing roar (Kizilyurt).Method.In the production of foam concrete, a method was used in which foam was prepared in the foam generator, then a solution of cement, filler and water was prepared. Then the foam is mixed with a solution in a foam mixer until a set of appropriate multiplicity. (Multiplicity in this case was defined as the ratio of the volume of the foam concrete mixing solution after mixing to the volume of the solution before mixing). During the study, the water-cement ratio was determined using three types of aggregates (expanded clay sand, quartz sand deposits Kumtorkala district and perlite sand). The turn-over rate of the concrete mixture was determined using the Attard viscometer.Result.The results of studies have shown that with an increase in the water-cement ratio using three types of aggregates (expanded clay sand, quartz sand deposits Kumtorkala district and perlite sand ) will increase the flow rate of the foam concrete mixture.Conclusion.At the same values of the water-cement ratio, the mixture with a filler of perlite sand has the lowest fluidity, which in turn affects the further structure formation of foam concrete and allows you to choose the optimal composition with the desired properties. The possibility of increasing the turnover of artwork and reducing the complexity of artwork work for monolithic foam concrete by regulating its properties due to the optimal use of local aggregates of the Republic of Daghestan and industrial waste.