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UDC 628.321
Zhadan A. V., Kasatochkin A. S., Larionov S. Iu., Panteleev Aleksei, Riabchikov Boris, Shilov Mikhail
Testing VTI-M pilot high-rate lamella clarifier with microsand
Summary
In order to test and adjust in pilot mode the technology of enhanced water coagulation a VTI-M pilot high-rate clarifier with microsand was designed. The installation with a capacity of up to 30 m3/h is designed for the purification of surface, storm and waste water. It is constructed in such a way that the purification process can be carried out either with recycling of generated sludge or with the use of fine-grained sandy weighting material. VTI-M clarifier provides for the sustainable water quality that fully meets the requirements to the quality of water supplied to ion exchange desalination.
Key words
coagulation , coagulant , flocculant , microsand , clarifier , enhanced treatment , sand recycling , thin-layer block
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UDC 628.321
Riabchikov Boris, Larionov S. Iu., Panteleev Aleksei, Shilov Mikhail
The study of enhanced water coagulation with the use of microsand
Summary
The results of the analysis of the present day advanced water coagulation equipment are presented. The results of the study showed that using the systems with sludge recycling and microsand addition was the most efficient solution. Because of the lack of reliable data on the efficiency of the given equipment, operational mode and chemical consumption, experimental units were designed that provided for testing the required modes and significant improving the process. Using sand from a packed column equipped with airlift for washing produced good results. Sand loss was less than 1%. In the process of the experimental studies it was shown that the effect of fast precipitation in the clarifier at high linear water flow rate was possible. However, the use of static chemical mixing systems does not provide for the sustainable unit operation with changing parameters – flow rate, stock solution concentration, and temperature. For that reason the unit was upgraded following Actiflo option with the use of mechanical mixers for mixing with chemicals and sand, however, with sand and sludge separation in the plate column equipped with a pulsation system to improve the wash efficiency. The designed flowsheet of sludge separation into microsand and sludge with the help of a packed column showed significant advantages compared to the system with hydrocyclones. On the basis of the obtained data terms of reference for designing a pilot unit were developed.
Key words
potable water , hydrocyclone , coagulation , microsand , flocculation , static mixer , wash column
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UDC 628.32
Larionov S. Iu., Panteleev Aleksei, Riabchikov Boris, Shilov Mikhail, Kasatochkin A. S., Zhadan A. V., Savochkin Andrei
Commercial tests of VTI-M high-rate horizontal clarifier enhanced with microsand
Summary
For the adjustment of enhanced coagulation technology on industrial scale a commercial VTI-M plant has been designed for the purification of surface and waste water as well as storm run-off. The design capacity of the plant is up to 300 m3/h. Enhancing the impurity sedimentation process is achieved using fine-grained sand weighting agent. Its subsequent washing off of the sludge is carried out in a pulse column which provides for reducing significantly the amount of secondary waste compared to the known analogues. The development of a new horizontal type clarifier was carried out on the basis of previous laboratory, pilot and experimental-industrial studies. VTI-M commercial clarifier consistently provides for the high quality clarified water that fully meets the requirements for the composition and quality of water supplied for ion-exchange desalination. During the testing period water was supplied for production needs. The use of the equipment package allows obtaining high quality water while reducing the consumption of acids and alkalis which in turn will reduce the discharge of salt waste and thereby reduce the harmful impact on the environment.
Key words
coagulation , coagulant , flocculant , microsand , enhanced treatment , sand recycling , water , commercial plant
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DOI 10.35776/VST.2021.02.02
UDC 628.164
Larionov S. Iu., Panteleev Aleksei, Riabchikov Boris, Kasatochkin A. S.
Chemical water softening systems with a contact media blanket
(a review)
Summary
Chemical softening of drinking water is used quite rarely due to the difficulty of preparing chemicals, maintaining the required and constant water temperature, complicated design and maintenance of the installations under the conditions of a water intake. A particular problem is waste utilization. In the middle of the last century, so-called vortex reactors with contact media began to be used that had a significantly higher capacity and did not require water heating. In the reactors solid granules of carbonate are generated, which is equivalent to the modern concept of zero liquid discharge, i. e., closed cycle technology. In Russia, they were designed at VNII VODGEO; however, did not gain widespread use. The next step was the development of reactors with fluidized bed of contact media. These apparatuses are widely used in Europe and the USA. At present, Mediana-Filter SPC, JSC is busy with designing and studying such reactors. They have a high specific capacity – 50–100 m3/(m2·h) – and are much easier to operate and maintain than clarifiers. The capacity of the plants reaches thousands of cubic meters per hour. The review considers the stages of development, ways of improving the reactors, their advantages and disadvantages.
и существенно проще в обслуживании, чем осветлители. Производительность установок достигает тысяч кубометров в час. В обзоре рассмотрены стадии развития, пути усовершенствования реакторов, их преимущества и недостатки.
Key words
suspended layer , microsand , water , commercial plant , chemical water softening , contact media , vortex reactor , calcic pellets , fluidized bed
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UDC 628.321
Gaid Kader, Sauvignet Philippe, Buisson Hervé
The combination Actiflo – MF/UF membrane: an efficient solution for surface waters
Summary
Process schemes of surface water treatment with membrane filtration in most cases at the final stage require advanced clarification technologies that provide for efficient removing color and high concentrations of organic and suspended solids from raw water. Therefore, «Actiflo® – ultra- and microfiltration» process scheme is the optimal solution for drinking water purification. The results of pilot tests of «Actiflo® – ultra- and microfiltration» process scheme are presented. The experience of operating the plants using this scheme is generalized.
Key words
coagulation , ultrafiltration , microfiltration , surface water , microsand , flocculation , pretreatment , Actiflo® process scheme
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UDC 628.16.066.1(282.247.41)
Podkovyrov V. P., Arutyunova I. Yu., Yagunkov S. Yu., Shemyakin Yu. V., Strikhar Yu. V.
Technology of high-speed water clarification with the use of microsand
Summary
The Research & Development Centre of MPUE Mosvodokanal investigated a new process of high-speed water clarification. The presented technology is an upgraded option of the traditional technology of water clarification. It allows using the potential of coagulation-settlement processes to the maximum extent. These processes have been the vital stage of the water treatment technology. The results of the studies showed that the developed technology ensures more efficient color and permanganate oxidizability removal compared to the traditional water treatment process used; besides, it decreases drastically the concentration of residual aluminium in drinking water.
Key words
potable water , chromaticity , residual aluminium , high-speed clarification , microsand , permanganate oxidizability
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