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UDC 628.1/.2 (211-17)
Murashev S. V.
Systems of water and wastewater treatment for offshore and coastal facilities under the conditions of Arctic climate
Summary
The aspects of designing water supply and wastewater treatment systems for offshore Arctic facilities – floating drilling units, platforms and terminals are considered. Owing to the special conditions of operating floating drilling units in Arctic marine during long ice seasons a number of additional requirements to the water treatment systems shall be taken into consideration. Among them is reduction on the use of tankers-water carriers and of the fresh water reserve at the offshore facilities inter alia by abandoning the discharge of grey wastewater after proper treatment into the sea. Designing floating facilities of special purpose with the use of advanced small-scale and efficient systems of water purification and wastewater treatment – life-support vessels that is a separate trend in shipbuilding has been suggested and justified. Life-support vessels can be used for water transportation and waste disposal or as seasonal water and wastewater treatment systems for different purposes including emergency conditions.
Key words
water treatment , desalination , membrane technology , water treatment , offshore Arctic facilities
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UDC 628.162:62-278
Andrianov A. P., Pervov A. G., Efremov R. V., Spitsov D. V.
Selection of efficient inhibitors for process flow schemes of the Black Sea water desalination
Summary
Sea water desalination by reverse osmosis has been widely used in drinking and domestic water supply. However, one of the major problems that complicate the operation of desalination facilities is the deposition of low solubility salts in membrane apparatus. In order to control the formation of crystal sediments on membranes different methods are used. Inhibitor dosing to raw water is the most efficient method. A variety of efficient inhibiting agents has been developed. Lately one of the main directions of studies in this field has been new types of phosphorus free and easily biodegradable inhibitors. Tests of six new phosphorus free inhibitors were carried out; the comparison with traditionally used Aminat-K inhibitor is given. The experimental dependencies that allow determining the rate of calcium carbonate scale formation in membrane apparatus are presented. Basing on the obtained results the optimal operational expenditures for sea water desalination were calculated. The study was aiming mainly at comparing the efficiency of newly developed and traditional inhibitors in the process of their use in sea water desalination schemes (by the example of the Black Sea water simulant). The conclusion of the efficiency of the inhibitors used is made on the basis of the minimum operational expenditures for desalination.
Key words
water treatment , reverse osmosis , inhibitor , desalination , membrane unit , sea water , low solubility salt deposit
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UDC 628.1.2:62-278
Frenkel V. S.
Membrane Technologies: Past, Present and Future (the North America as an Example)
SUMMARY
Basic tendencies in the field of development of membrane processes for water and wastewater treatment in the North America are covered. Main characteristics, basic trends and features of the use of membranes including membrane bioreactors are presented. Characteristics necessary for assessment and selection of the best membrane technologies for each certain project are compared. Membrane treatment has become the fastest growing sector in water treatment, wastewater treatment and water desalination. Four types of membranes are used according to membrane pore size: microfiltration (MF), ultrafiltration (UF), nanofiltration (NF) and reverse osmosis (RO). All four principal types of membrane guarantee the removal of the entire spectrum of water pollutants and can be used as a stand-alone technology for a majority of applications. Integrated membrane processes combining different membrane types are becoming a cutting edge approach to meet strict water/wastewater quality regulations because they allow the smallest possible system size, minimize chemical consumption, and provide the most cost-effective solution for the greatest number of applications.
Key words
potable water , wastewater treatment , reverse osmosis , ultrafiltration , desalination , membranes , microfiltration , nanofiltration , membrane bioreactor
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UDC 628.164-92:66.081.63
DOI 10.35776/VST.2023.05.01
Kasatochkin A. S., Larionov S. Iu., Kharitonov Nikolai, Shilov Mikhail, Савочкин А. Ю., Riabchikov Boris
Purification of water with high permanent hardness and salinity
Summary
Chemical softening methods have been widely used in the practice of water treatment, primarily in the energetics and industry for softening, decarbonization and decoloration of water. In combination with reverse osmosis, they provide for preparing water of the required qualitative composition. In drinking water supply softening methods are used quite rarely due to a number of circumstances, such as the need to use various chemicals that are not typical for public water supply; generation of a large volume of sludge subject to subsequent processing, and, what is most important, resulting in highly alkaline water with pH of more than 10 unacceptable for drinking water. However, in case only but water sources with such a complex composition are available, then chemical methods have to be used. In Mediana-Filter Research and Production Company, JSC studies were carried out to obtain high-quality water from an underground source of uncharacteristic salt composition, with a high content of sulfates and low alkalinity, provided that the purification technology should generate minimum liquid waste. After testing several technology options in pilot plants, a scheme was proposed that met the requirements of the customer. It should be noted that underground water of the southern regions of the country has a partially similar salt composition, so the results of pilot tests can also be applied to obtain drinking water from similar sources.
Key words
reagent treatment , flow chart of treatment , reverse osmosis , desalination , hardness , pilot plant , sulphates , water , dynamic softening system , liming , sodium liming , soda softening , sludge blanket , dynamic softening system water conditioning
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DOI 10.35776/VST.2022.02.03
UDC 628.165:66.081.6
Mazhuga Aleksandr, Kagramanov Georgii, Parusov Denis, Бланко-Педрехон А. М.
Aspects of the desalination of mineralized water in arid
and water-deficient territories
Summary
Supplying drinking water in coastal arid and water-deficient regions has been an urgent problem due to the population growth and progressive pollution of natural waters. To desalinate seawater, evaporation (distillation) or a membrane separation process – reverse osmosis – is usually used. The justification for choosing a seawater desalination method and the productivity of desalination plants is based on the solution of a number of closely related engineering, economic and environmental tasks. Water desalination involves relatively high energy costs; therefore, reducing the costs can be provided by increasing the fuel heat-availability factor, that is, by using cogeneration (cogeneration of heat and electricity). This determines the comprehensive technology of desalination using membrane methods of demineralization followed by the evaporation of the reject water. Herewith, the balance of the reverse osmosis and evaporator plant performance is determined by the ratio of the generated thermal and electrical energy.
Key words
potable water , reverse osmosis , desalination , desalination , evaporation , sea water
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UDC 628.171
Ivankova T. V.
The current state of water supply in the Republic of Crimea
and possible additional water sources
Summary
The state of water availability of the Crimea peninsula in the period 2014–2017 is considered; the water consumption of the population is analyzed. The main problems with the supply of high-quality drinking water to the population are associated with the unsustainable use of water resources, poor water quality in rivers, surface water bodies, discharge of raw or insufficiently treated wastewater, wasteful flow and significant water losses in the water supply system. In 2017, the total water abstraction in the Republic of Crimea amounted to 301.33 million m3: from surface sources – 177.67 million m3, underground – 123.66 million m3. Water supply of cities and rural settlements is provided from surface (water reservoirs) and underground (artesian wells, groundwater intake structures) sources. The consumption of fresh water was 267.67 million m3, the losses during transportation – 12.3 million m3 (4.7%). The most unfavorable regions in terms of sanitary and chemical indicators of drinking water are: the cities of Krasnokopsk, Armiansk, Evpatoria, Dzhankoy, as well as Krasnoperekopsky, Pervomaisky, Leninsky and Saki districts. Methods of supplying fresh water used in arid countries (Israel and UAE) are considered. For the water supply of the Crimean peninsula a set of measures is proposed: step-by-step reconstruction of the water management complex; upgrade and additional construction of local drinking water treatment facilities; replacement of outdated water distribution networks; reconstruction of the existing water reservoirs and the construction of additional bulk reservoirs, storage ponds on the local flow; the introduction of water-saving technologies in industry, utilities and agriculture; the use of drip irrigation systems in agriculture; the use of brackish underground sources; desalination of sea water; promotion of water conservation.
Key words
ground water , water supply system , desalination , water availability , water scarcity , water reservoirs
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DOI 10.35776/VST.2022.09.01
UDC 628.166.094.3(477.75)
Skryabin A. Yu.
Ecological safety of Crimea: advanced technologies
of water management complexes
Summary
The main problems of the Crimean water supply are related to the shortage of drinking water, low technological and sanitary reliability of water treatment systems, the lack of a sufficient number of demineralization, softening and disinfecting water plants in the shoreland and rural areas, and the unsatisfactory state of the water distribution network and treatment facilities. In the circumstances concerned, an urgent task is to provide the population of Crimea with high-quality drinking water when increasing the environmental safety of the operation of engineering and water management complexes, including facilities, plants and installations for the treatment and disinfection of natural and waste water. The aspects and ways of solving the problems of recycling and reusing as a commercial product the concentrate of desalination and water softening plants, as well as electrolysis wastes of sodium hypochlorite production at the water treatment facilities for water disinfection are considered. Environmentally friendly technological solutions for the operation of the plants for chemical softening, reverse osmosis and sodium hypochlorite production from aqueous solutions of common salt are recommended.
Key words
disinfection , sodium hypochlorite , desalination , decarbonization , chemical softening , water scarcity , no-waste technology
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