Water quality

Water supply to the city of Konayev is carried out from two sources:

- surface water intake (Kapshagay reservoir);

- underground water intake (Nikolaevskoye groundwater deposit). Requirements for the quality of water supplied for household and drinking needs of the population are established in accordance with the Sanitary Rules "Sanitary and Epidemiological Requirements for Water Sources, Household and Drinking Water Supply, Places of Cultural and Domestic Water Use and Safety of Water Bodies", approved by the order of the Minister of Health of the Republic of Kazakhstan dated July 28, 2010 No. 554.

Water from the surface water intake is supplied by the pumping station of the 1st lift through two pressure main water pipelines to water treatment facilities. The pumping station of the 2nd lift supplies water through two pressure pipelines to the city water supply system.

Water treatment facilities with a design capacity of 20.4 thousand m3/day were put into operation in 1968. The water purification scheme at the filtration station is classical: coagulation, settling, filtration and disinfection.

Composition of the structures at the filtration station site.

Mixers - vertical vortex type - 2 pcs., designed for active mixing of the reagents used with the treated water.

Clarifiers - vertical with a layer of suspended sediment - 4 pcs., designed for settling and settling of large suspensions in the treated water.

Filters - open type, rapid, non-pressure - 4 pcs., cap drainage system, filter loading - zeolite (layer height 1.2 m with a grain fraction of 0.7-1.5 mm), supporting layer - gravel, designed to retain suspended substances in the water.

Reagent facility. Water is coagulated with sodium hypochlorite during primary chlorination of water.

Chlorine facility – is designed to prepare on-site from a saline solution, by electrolysis – an aqueous solution of sodium hypochlorite, for use in disinfecting treated water at purification stages. Hypochlorite is supplied in two stages – primary – to mixers, to improve the coagulation process and maintain the structures themselves in the proper sanitary and epidemiological condition, secondary – after filters, to ensure contact chlorination in the RChV and maintain the required dose of chlorine in the city distribution network.

Flow chart of water purification at water treatment facilities. Water from the Kapchagay reservoir is supplied by a temporary pumping station of the 1st lift through two pressure main water pipelines, D = 400 mm each, to vertical vortex-type mixers for mixing the reagents used with the treated water. From the mixers, the water is sent to vertical clarifiers with a suspended sediment layer. Clarified water after the clarifiers is fed to fast, non-pressure open filters with filter media. Zeolite is used as a filter media. Then it is sent to a clean water tank with a volume of 2000 m3

Water is chlorinated after the filters. Water moves through the structures by gravity.

Technological scheme of water purification in clean water tanks

Water from the well intake is supplied through two pressure pipelines 14.5 km long to clean water tanks with a total volume of 22,000 m3. Disinfection of groundwater is carried out in clean water tanks with imported sodium hypochlorite. Sodium hypochlorite is produced in electrolysis units located on the site of the filter station. Chlorination is continuous - control over the supplied dose of chlorine is hourly. The dose of active chlorine is set depending on the concentration of residual chlorine in water, 0.3-0.5 mg-l. The concentration of residual chlorine in water is measured by the operator every hour.

Clean water tanks are designed to carry out the final process of contact chlorination, as well as to store emergency, fire-fighting and reserve water for own technological needs. From clean water tanks, water is supplied through two gravity pipelines to the city water supply system.

The installed equipment undergoes mandatory diagnostics. The frequency of diagnostics is once every 2 years.

Capital and current repairs of the main and auxiliary equipment are carried out according to the approved schedules in the volume according to the consolidated cost estimate.

The quality of drinking water meets the requirements for the quality of water for household and drinking needs of the population, according to GOST-2874-82 "Drinking water" and SanPiN order No. 209 of 16.03.2015.