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Hygiene in drinking water reservoirs

Hygiene in drinking water reservoirs
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Hygiene in drinking water reservoirs - 1

WASTE WATER Solutions Hygiene in drinking water reservoirs Optimal hygienic conditions in drinking water reservoirs Tank ﬂow without dead zones Supply air ﬁltering Air gap separation in overﬂow line to prevent backﬂow Intelligent pipeline conﬁguration Obje

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Hygiene in drinking water reservoirs - 2

Drinking water must be absolutely hygienic when fed from reservoirs into the drinking water network. Water is our most valuable resource. Drinking water released to consumers must meet the standards set by the Drinking Water Ordinance. The consumption of drinking water in Germany has been declining in the past years. Therefore, pipeline networks and water reservoirs are partly oversized now, which prolongs water residence times from production to consumption and hence leads to hygiene problems. Optimization of water quality is necessary to counteract reduced water withdrawal rates....

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Hygiene in drinking water reservoirs - 3

➤ Reservoir ventilation – ➤ ➤ Supply air ﬁltering reduces hygiene risks There is something in the air … minimal compared to that for a coarse material filter. Operators should therefore not shrink from this investment into the hygiene safety of their water reservoir. Typically, the water surface in a tank is permanently in motion. During the filling process air is streaming out, whereas during the emptying process ambient air is sucked in. In this respiration process also particles contained within the air are carried into the drinking water along with oxygen and nitrogen. Since also germs,...

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Hygiene in drinking water reservoirs - 4

➤ Check list for water reservoirs. ➤ ➤ Does your reservoir guarantee compliance with Drinking Water Ordinance requirements? Surface ﬂow problem Similar to a landing approach to an airport the fresh feed water is circling over the “runway” (= outlet) until the OK for landing (= water discharge) is received. The HUBER outlet turbine supports this flow. Often, there is not enough movement in the surface of the water volume. Also frequently noticed thermal stratification leads to serious problems. Due to the contact with ambient air combined with increased temperature the susceptibility to...

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Hygiene in drinking water reservoirs - 5

➤ Check list for water reservoirs. ➤ ➤ Does your reservoir guarantee compliance with Drinking Water Ordinance requirements? WASTE WATER Solutions Do some of the following statements apply in your case? ➤ No ladders, stairs, platforms, railings ➤ Non-compliance with applicable standards ➤ Entrance directly above water level ➤ Materials susceptible to corrosion ➤ No possibility of inspection during operation ➤ Steep and narrow transport ways ➤ Direct incidence of light ➤ Insufficient protective gear ➤ No stairs, ladders or pressure doors ➤ No escape ways (e.g. anti-panic lock) ➤ Insufficient...

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Hygiene in drinking water reservoirs - 6

➤ Explanations – ➤ ➤ Optimal hygiene requires careful detailed solutions Hydraulic equipment However, the filters are charged in both directions, the danger of regermination is eliminated. The reliability of this system has been proven in long years of experience. Feeding and withdrawal frequently do not take place at the same time but optimal interaction of the feed pipe and outlet turbine guarantees a stable rotary movement even under varying operational statuses. Moreover, also the physical air gap in the overflow line for backflow and germination prevention and sampling points ensure...

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Hygiene in drinking water reservoirs - 7

➤ ➤ ➤Object protection makes intruders surrender before they use violence Realize the danger of burglary WASTE WATER Solutions resistance until the reaction force arrives on the scene. Applicable reporting and crisis plans prescribe which measures to take. In this way, a lot of incidents could certainly have been prevented in a seminal stage. Cases of burglary and vandalism are reported by the police every day. Also frequently remote plants and water supply facilities are under constant threat of unauthorized manipulation. It is the operators’ responsibility to ensure the drinking water...

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Hygiene in drinking water reservoirs - 8

➤ Application example: Drinking water must be absolutely hygienic when fe ➤ ➤ Outlet turbine Adaption to tank conﬁguration The outlet turbine type HUBER NR 22 with integrated guide vanes serves as outlet construction. The turbine supports the rotary movement of the water roll and ensures equal distribution of the water over the whole circumference. Feeding and withdrawal frequently do not take place at the same time but the impulses from the feed pipe and outlet turbine guarantee stable rotary movement even under varying operational statuses. The flow system shown here is especially...

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Hygiene in drinking water reservoirs - 9

n fed from reservoirs into the drinking water network. WASTE WATER Solutions These microbial parameters must be met. Name Limit value Escherichia coli Faecal streptococci Colony forming units CFU Every drinking water reservoir respirates Huge amounts of air are sucked in as drinking water is being withdrawn. This air must be pressed out again during tank filling. The hygiene problem lies in the “breath-in” process. Depending on ambient air quality, there is a certain risk that higher amounts of dust, bacteria, viruses and germs may pass into the stored drinking water. The installation of a...

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Hygiene in drinking water reservoirs - 10

➤ Beneﬁts for planners and operators from using standardized ➤ ➤ HUBER products WASTE WATER Solutions Overall concept Optimal hygiene in water reservoirs can only be ensured if an overall concept for all areas of building and plant technology is worked out and consistently implemented. Planning aids are provided in our brochures and CD ROM. In addition, our sales engineers are available for advice. Last but not least, our experienced service staff guarantee reliable installation. Access to water chamber Standard products save costs Based on our long years of experience we have developed a...

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