Estimation of sediment volume in Tuyamuyun hydro complex dam on the Amudarya River

Self Cite

In the present era, when climate change has become a global problem, efficient use of water resources is becoming an important task. Natural field research was conducted in Chartak reservoir. In order to determine the amount of turbidity entering with the flow, the characteristic tributaries were determined along the length of the reservoir, and in each tributary, samples were taken using a bathometer at different times of the season and filtered in laboratory conditions. According to the analysis of the results, the average amount of incoming turbidity was 0.3-0.5 g/l, and the amount of outgoing turbidity was 0.05-0.08 g/l. Samples of the sediments that sank into the reservoir bowl were taken and their fractional and chemical composition was analyzed in the laboratory of “Gidroproekt” JSC. According to the fractional composition of muddy sediments, particles with a diameter of 1.0-0.5 mm are 13.98%, particles with a diameter of 0.5-0.25 mm are 11, 49%, particles with a diameter of 0.25-0.10 mm - 7.56%, particles with a diameter of 0.10-0.05mm - 10.48%, particles with a diameter of 0.05-0.01 mm - 26.8%, it was found that particles with a diameter of 0.01-0.005 mm make up 13.34%, and particles with a diameter of 0.005-0.002 mm make up 16.42%. If we pay attention to the distribution and share of sediments on the walls, 35-40% of particles with a large fraction (d=1.0-0.1 mm) and 50-60% are particles with a small fraction (d=0.05-0.001mm). It is based on the presence of particles rich in microelements useful for agricultural fields in sediments. If we pay attention to the distribution and share of sediments on the walls, 35-40% of particles with a large fraction (d=1.0-0.1 mm) and 50-60% are particles with a small fraction (d=0.05-0.001mm). It is based on the presence of particles rich in microelements useful for agricultural fields in sediments. If we pay attention to the distribution and share of sediments on the walls, 35-40% of particles with a large fraction (d=1.0-0.1 mm) and 50-60% are particles with a small fraction (d=0.05-0.001mm). It is based on the presence of particles rich in microelements useful for agricultural fields in sediments.

Section: Introductionmentioning

confidence: 99%

Analysis of fractional and chemical composition of chartak reservoir sludge sediments

Xoshimov

Qosimov

Ortikov

et al. 2022

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“…Precipitation began to correspond to showers and continuous rains. After 15-30 minutes, on average, the concentration of impurities in the rainwater decreases by 1.5-3 times [8] The average concentration of contaminants in surface runoff, purification of drinking facilities, is SVV = 500 ... 2000 mg / l; Snp =30...70 mg/l; BOD5= 20...30 mg/l; COD = 100...150 mg/l, which is somewhat different from the data for Russia [9].…”

Section: Introductionmentioning

confidence: 63%

Increasing the efficiency of sedimentation tanks for drinking water treatment

Juraev

Akramov²,

Abdurazzokov³

et al. 2022

The sedimentation process is of great importance in the purification of drinking water. To improve the efficiency of horizontal sedimentation tanks for drinking water treatment, it is recommended to use thin-layer sedimentation tanks. Experimental studies of the effectiveness of water distribution methods in a thin-layer sump were carried out on model and semi-industrial installations. The settling tank model was made of organic glass at a scale of 1:12. In accordance with the scale factor and the Froude criterion, Qo, tp, Vp were determined. An analysis of the research results showed that for all values of m, the closest approximation of Vph to Vr was achieved when the upper edges of the plates were located along a curve calculated using a method that considers the water flow in the distribution volume as a flow of variable mass. KOI at the same time exceeded 90%. It has been established that with a 3-4-fold increase in the hydraulic load of the sump with the proposed method of water distribution, its KOI decreases slightly (from 92-95% to 74-85%), while with the location of the upper edges of the plates along an inclined or horizontal straight line, the KOI decreases from 68-83% to 15-20%. For the conditions of production operation of sedimentation tanks, where, depending on the time of day, year and production technology, the amount of drinking water can vary widely, this circumstance is of particular importance. As a result, the efficiency of the drinking water treatment process will be increased.

“…The roots of equation (9) give the optimal values β 1 = β 1opt corresponding to the optimal length of the settling zone of a thin-layer settling tank. The solution of equation ( 9) presents certain difficulties and was obtained on a computer.…”

Section: Resultsmentioning

confidence: 99%

Optimum placement of thin-layer elements in a horizontal sedimentation tank purification of drinking water

Akramov

Juraev

Xoshimov

et al. 2022

Self Cite

Experimental studies of the effectiveness of water distribution methods in a thin-layer sump were carried out on model and semi-industrial installations. When designing sedimentation tanks, it is usually recommended to take η = 0.03-0.07. According to our data, when η > 0.05, it is not possible to ensure uniform operation of all slots (holes), which worsens the hydrodynamic conditions in the settling zone. Experiments have also established that double gratings with a relative area of holes of 2n provide almost the same flow distribution as single gratings. In this case, the experimental values of β 1 were 2.6 and 2.7, respectively, i.e. differed by no more than 5%. With this in mind when installing double gratings with reflectors, the relative area holes with a sufficiently efficient flow distribution can be accepted and η = 0.06-0.1 instead of η = 0.03-0.05 recommended for single grates, which is essential to reduce the risk of clogging them and improve the reliability of sewer sedimentation tanks. The obtained dependences with sufficient accuracy for practice can be used to calculate double gratings and gratings with reflectors at values η=2η1 , where η1 is the relative area of the slots in a single grating, as well as when calculating partitions with round (square) holes, taking into obtained formulas bs = r holes, and ns = n holes.