Engels, Russia
Engels Water Treatment Station
Water intake
Since 2005 chlorine cylinders are replaced by AQUACHLOR-500 devices for drinking water disinfection at Engels Water Treatment Station. The station’s daily drinking water output i 100 000 m3/24 hours. Depending on season 40 to 80 thousand m3/24 hours is disinfected by the oxidants solution.
AQUACHLOR devices are manufactured as modules with oxidants production of 30, 50, 100 è 500 g/h.
AQ-500 is a post with the base dimensions of 40 by 50 cm and height of about 180 ñm. It is a completely self-contained module including electrochemical reactor, hydraulic scheme, membrane pump for dosed supply of brine during operation or 10% hydrochloric acid solution for de-scaling, ejector mixer for dissolving gaseous mixed oxidants in the stream of water passing through the device with consumption of 400-500 liters per hour, power source, control and automation unit switching the device off in case of emergency (stoppage of water supply, unavailability of brine). Space required for installation and operation of one AQ-500 system should not be less than 3 m2 (including space required for technical servicing), for installation of two AQ-500 systems – not less than 4 m2, for installation of six and more devices space of the room should be calculated on the basis of 1 m2 for one ÀQ-500.
AQ-500 modules connection scheme as a united system
Water treatment station,Engels 2005. Eight AQUACHLOR-500 devices with total oxidants output capacity of 96 kg hours are installed at the former chlorination room.
Water Treatment Stations, Engels, 2005. 8 AQUACHLOR-500 devices are supplied with brine from the brine tank (left), oxidants solution is supplied directly to the water to be treated, catholyte is collected in the tanks (right) and is used for cleaning of filters and as a coagulant.
What are location requirements? Is design work required?
AQUACHLOR-500 systems and support equipment layout at the Engels Water Treatment Stations.
AQUACHLOR devices can be installed without design and construction works in the existing chlorination room or in any room equipped with heating/conditioning, combined extract and input ventilation with single volume air change once per hour;
Space required for installation, operation and technical servicing of one AQUAHLOR-500 device should make not less than 7 m2 including space for brine and acid solution HCl (for de-scaling of the reactors) preparation and supply tanks.
Availability of pressure line (from 3 to 6 bar/sm2), sewerage, electric power (220 V) in the premises is essential.
Selection of oxidants supply method
AQUACHLOR-500 systems and support equipment altitude layout at the Engels Water Treatment Station.
In case when AQUACHLOR is installed higher than oxidants solution supply point it is advisable to supply the oxidants solution by gravity through tubing of the respective diameter directly to the infeed point. If the oxidants infeed point is higher than AQUACHLORs it is possible to use ejector pumps of the existing chlorine water supply system. It is also possible to supply concentrated chlorine-gaseous-aqueous mixture to suction inlet of the existing ejector from special controller-manifold which is delivered in such case with the rest of equipment, or through a collecting tank equipped with automatic or manually controlled dosing system or manually controlled.
Four AQUACHLOR-500 devices are installed on each carriage, manifolds for brine supply from brine tank, for directing catholyte to the catholyte tank and directing the oxidants solution to the treated water. Engels Water Treatment Station, 2005..
AQUACHLOR-500 modules are connected to manifolds by quick release coupling which allows to install and dismantle AQ-500 module in 5-7 minutes.
Input oxidants amount control AQUACHLOR systems operation record
Engels WTS, 2005. AQ operation book of record
Operating parameters control
nput oxidants adjustment is made by way of changing quantity of operating AQ-500 modules or by way of changing current strength at each module’s individual power control unit. AQUACHLOR becomes automatically disconnected if water (which mixes with oxidants to become oxidants solution) stops running through any of AQ modules. AQUACHLOR also becomes automatically disconnected in case if the reactor’s temperature exceeds 55 degrees. One of the main technological features of AQUACHLOR is that brine consumption for synthesis of the oxidants in the reactor’s anode chamber is fully determined by current strength, brine efficiency remaining equal to 99,5 % at any current magnitude. This allows to carry out exact dosing of oxidants into the disinfected water by way of changing the oxidants concentration in the "chlorine water" – the oxidants solution by adjusting current strength.
Further improvement of water disinfection technology applying AQUACHLOR devices goes in the direction of optimization of hydraulic circuits and automation systems and concurrently installation of bigger quantities of AQ-500 modules (from 100 to 1000). At present the biggest quantity of simultaneously used AQ-500 modules amounts to 18. However, projects assuming installation of over 100 units at one place are in developmental stage.
Since 2006 the quantity of AQ devices at the Engels Water Treatment Station was increased to 16 units providing oxidants production of 192 kg/24 hours as chlorine equivalent
Oxidants solution produced in AQUACHLOR devices is a universal disinfecting agent which is proved by favorable comment on AQUACHLORs operation at the Engels Water Treatment Station given below.
"The process of transition from water disinfection by liquid chlorine to disinfection by oxidants produced in AQUACHLOR-500 devices have been taking place in our enterprise since 2005. In August 2005 four devices were installed, in November 2005 four more devices were added and in 2006 8 more AQUACHLOR-500 devices were installed.
The following conclusions were made consequent to AQ operation: The devices are remarkable for their high reliability and good operating performance. Operational technical characteristics are close to those of manual and, generally, depend on chemistry of initial products. No repairs were required during all the time of operation.
Oxidants produced by AQUACHLOR devices are used for initial disinfection of the Volga source water (surface water supply point). Preliminary tests show higher oxidants activity compared to liquid chlorine.
In January 2007 two AQ devices were installed at the intermediate pump station providing water supply to one of the city’s districts with population of 23000 persons. Major manufacturing enterprises are located in the district as well. Extension of water-supply from the source to the pump station exceeds 20 km. Taking into consideration depreciation of the water-supply facilities it was not always possible to ensure that quality of water complies with Sanitary Inspection requirements. Residual chlorine traces were observed during cold seasons only resulting in deflections from Sanitary requirements in the final and dead-end sections of water-supply. AQUACHLOR’s construction allowed to adjust oxidants supply of 0,23-0,25 mg/l for all volume of water, residual chlorine is now observed in all sections of water-supply practically in the same concentrations which proves longer life of oxidants in comparison with liquid chlorine."
