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UDC 628.16.066.7
Volftrub L. I., Yegorov V. F., Staroselets L. N., Panicheva S. A., Lashmanova E. O., Yunok S. A., Moulikov R.
Upgrading flocculation tanks, settling tanks and clarifiers at the water treatment plants
Summary
The methods of improving the design of flocculation tanks, settling tanks and clarifiers with floc blanket based on the use of thin-layer – recirculating flocculation and thin-layer precipitation processes are presented. When employed in new construction the footprint of the facilities is reduced 2–3 times; whereas during the upgrade of the existing facilities their capacity increases together with water quality improvement and reduction of chemical consumption. The design of thin-layer self-cleaning modules manufactured in bulk in the form of polyethylene honeycomb blocks of polyethylene film more than 250–300 μm thick is presented. The positive long-term experience of operating the upgraded facilities located at the public, industrial and power water plants that are purifying natural water of different quality and using different treatment technologies was consolidated.
Key words
sedimentation tank , flocculation chamber , recirculator , water treatment plant , clarifier , thin-layer module of honeycomb blocks
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DOI 000000
UDC 628.16
Ulchenko V. M., Tat’ianko Nataliia, Glinka Nikolai
Common problems at water treatment facilities and ways to address them
Summary
Due to the anthropogenic factors, the quality of surface water is subject to rapid, mainly negative, changes; therefore, water treatment plants not always can meet the standards of the drinking water quality. Currently, many water treatment facilities are in need of upgrade, re-technologization and even reconstruction. In addition, significant changes in the actual water supply by the water facilities (decreasing, as a rule) do not always produce a positive effect on the technical and economic indicators of the water treatment facilities. Problems arising during the operation of the water treatment facilities at all stages of surface water purification – microfiltration, chemical treatment, mixing with chemicals and flocculation, sedimentation, filtration and wash water treatment are summarized. The methods used by MY PROJECT JSC in its projects to address such problems as the lack of the treatment efficacy, overspending of chemicals, short filter cycle, large water losses for process needs, discharge of untreated wash water, high purification cost are considered.
Key words
sedimentation tank , microfiltration , rapid filter , mechanical mixing chamber , flocculation chamber , zeolites , reconstruction of water treatment facilities , dolomite
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UDC 628.16.066.7
Volftrub L. I.
The experience of operating lamella settlers and clarifiers with built-in flocculation chambers
Summary
The results of upgrading primary water treatment facilities – flocculation chambers, sedimentation tanks and clarifiers based on the use of low-flow and low-pressure recirculators and lamella honeycomb modules made of polyethylene film 250–300 µm thick designed by ECOHOLDING Group experts are presented. The developed method of jointing film into a honeycomb construction with an inner rigid frame provides for the ruggedness and spacial stability of the honeycomb module and allows stretching it on the frames on perimeter only. Firm jointing of the film allows manufacturing a honeycomb construction of any size and angle of slope providing minimum loss of clarifying surface of the facilities of any configuration, both radial and rectangular. For long-term operated facilities honeycomb modules are tailormade after each of them has been measured. The possibility of ensuring the required recirculation rate at low head loss and minimum liquid flow rate to prevent the recycled suspension from destruction and facilitate efficient floc formation is an essential advantage of the developed methods of recirculator designing and constructing. The presented high-efficient methods of coagulation and sedimentation improvement form the basis of prefabricated «Struiia» and «Vlaga» modular water treatment units with 100–12000 m3/day capacities. The units are designed for natural water treatment: turbidity and color removal, softening, defluorination, de-ironing (composite forms, high concentrations of iron) and disinfection. They are used in water supply systems of settlements, towns, hospital care and health resorts, sport centers, fish farms, industrial enterprises or separate production facilities.
Key words
turbidity , water treatment , modernization , residual aluminium , flocculation chamber , lamella settler , clarifier , honeycomb module
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UDC 628.16.081.32:628.094.3-926.214
Shushkevich E. V., Babaev A. V., Smirnov A. V., Sourayeva N. O., Grigoryev A. S.
Improving the water treatment technology at the West water treatment plant
Summary
In January 2011 newly built ozonation and activated carbon filtration facilities with a capacity of 250,000 m3/day were put into operation at the West water treatment plant in Moscow. The facilities are fully automatic. Monitoring and control of the treatment process is carried out from the central control room. The technology of ozonation in combination with activated carbon filtration ensures high efficiency of organics removal (color, permanganate oxidability, total organic carbon), deodorization, and improvement of the drinking water taste, allows minimizing the formation of chlororganics (chloroform). The amount of water treated with new technology was 490,000 m3/day or 43% of the total supply to the city.
Key words
settling , filtration , water treatment , ozonsorption , mechanical mixing chamber , flocculation chamber
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