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UDC 628.16.066.1
Zhurba M. G., Govorova Zh. M., Gandurina L. V., Govorov O. B., Yelyukov M. V.
Intensification of low-turbidity colored water treatment in a sludge blanket clarifier (part 1)
Summary
The specific features of high colored low turbidity water treatment in clarifiers with sludge blanket during representative time periods with low temperatures and water alkalinity are considered by the example of the Vologda water treatment facilities. The results of investigating chemical pretreatment of water from the Vologa River and Koubenskoye Lake during flood periods with the use of various oxychloride and aluminium sulfate trademarks as well as cationic and anionic flocculants are presented. The advanced methods of enforcing water treatment process in a sludge blanket are covered. The results of studying a «clarifier-filter with floating media» combined system are presented.
Key words
coagulant , flocculant , low turbidity colored water , sludge blanket clarifier , recirculator , filter with floating media
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UDC 628.16
Fomina V. F., Fomin A. V.
Upgrade of horizontal sedimentation tanks with the use of dissolved-air flotation
Summary
The analysis of the efficiency of low turbidity colored water of the Vychegda River purification at the water treatment facilities of Syktyvkar in horizontal sedimentation tanks operating in the mode of coagulation at 2–3 times lowered hydraulic loading is presented. The necessity of upgrading the sedimentation tanks by redesigning their exit sections into flotation chambers is substantiated. The enhancement of the sedimentation tank operation by equipping with a flotation chamber provides for meeting the regulatory requirements to the drinking water quality under the conditions of significant seasonal fluctuations of the raw water quality indicators and temperature. Enhanced clarification of the water being coagulated is ensured before the filtration stage; at that the flow rate of backwash water decreases 3 times, the number of filter washes per day decreases to 0.5 times and less (filter run increases to 2 days and more). Backwash water purification together with raw water provides for streamlining the process flow scheme and chemical facilities (the number of chemical injection and dosing points decreases); facilitating the operation of the facilities, 8% operational expenses saving and plant demand decreasing to 3%. The upgrade of horizontal sedimentation tanks with the use of dissolved air flotation is more economically and environmentally feasible than the reconstruction of the two-stage filtration facilities. It provides for doubling the sedimentation facilities output, decreasing the amount of wash water and combined with raw water handling.
Key words
wash water , horizontal settling tank , filtration , pressure flotation , low turbidity colored water , hydraulic loading , water treatment plant
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UDC 628.161
DOI 10.35776/VST.2023.03.01
Alekseeva L. P., Alekseev S. E.
Optimization of the process of colored water chemical treatment in characteristic periods of the year
Summary
Significant seasonal changes in the water quality in natural water supply sources cause problems in the purification of drinking water at a water treatment plant. This is particularly true in the process of purification of low-turbid colored water with a high concentration of organic substances, at low water temperatures. During flood periods, the pollution load on the treatment facilities increases significantly; as a result, the quality of treated water deteriorates, and it is rather difficult, and in some cases impossible, to ensure meeting the standards for some indicators. The problem is solved by applying various methods and creating conditions for the coagulation process, taking into account seasonal changes in the quality of the raw water and technological options for the purification at the water treatment facilities.
Key words
potable water , water treatment , low turbidity colored water , natural colored water treatment , natural water coagulation , contact coagulation
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UDC 628.16.081
Fomina V. F., Fomin A. V.
The experience of operating pressure flotation facilities for the purification of low-turbid colored water of the Vychegda River (on the occasion of 10 years of the startup of pressure flotation facilities
at the water treatment plant of Syktyvkar)
Summary
The results of operating the pressure flotation facilities with a capacity of 65,000 m3/day commissioned in May 2006 at the water treatment plant of Syktyvkar are considered. During 10 years the pressure flotation facilities have been successfully operating and ensuring high-level clarification of drinking water. The analysis of the main water quality indicators after each treatment stage showed that the pressure flotation method had been the most efficient for purification of low-turbid colored water of the Vychegda River. It is stated that during certain seasons color increase higher than 150–200 grades and temperature decrease result in complications with meeting the standard for permanganate oxidizability; therefore more detailed selection of chemical agents and dosage optimization is required. At the optimal coagulation operation mode the method of pressure flotation provides for enhanced water clarification to less than 1 mg/l turbidity which allows using filters as barrier facilities in case of turbidity breakthrough.
Key words
reagent treatment , coagulation , wash water , filtration , pressure flotation , low turbidity colored water
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UDC 628.16.069
Fomina V. F., Fomin V. P.
The efficiency of low turbidity colored water treatment in dissolved-air flotation units
Summary
In order to ensure high quality drinking water at the Syktyvkar water treatment plant for the entire lifecycle of the facilities a number of process lines were constructed with different combinations of the primary treatment facilities: horizontal settling tanks, contact primary filters, dissolved-air flotation units. The treatment line with dissolved-air flotation with a capacity of 65,000 m3/day was commissioned in 2006. The evaluation of the plant efficiency during the commissioning and follow-up operation periods is given. The advantages of using the dissolved-air flotation technology for low turbidity colored water treatment in comparison with the operation of other treatment lines are given. The efficiency of coagulated water flotation clarification is comparable with filtration.
Key words
pressure flotation , low turbidity colored water , flotation clarification
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