Major UK Stadium Case Study

Major UK Stadium Case Study

Major UK Stadium Case Study

Case Study: Stadium water supply

The dosing of water supplies with chlorine dioxide is a very common and effective method of preventing Legionella within buildings and facilities.

Prodose has recently specified and installed a chlorine dioxide generation system in a large, well-known sports stadium in the UK. This will help the venue to ensure a safe supply of water across all of the site facilities at all times.

The building management team got in touch with us because they were routinely finding low levels of chlorine dioxide in toilet facilities throughout the site.

We looked at the frequency and volume of water use within the stadium. As is usually the case with such venues, demand for water was extremely high during events but also very low at other times. This meant that, during long periods when water within the system was either not flowing or hardly at all, the levels of residual chlorine dioxide dropped down to unacceptably low levels.

We recommended the installation of a larger chlorine dioxide generator and an emissions-proof water storage tank. The large capacity of the generator would be able to keep up with the spikes in water demand during events, for example at half time when many audience members all visit the toilet facilities at the same time.

The water storage tank needs to be emissions-proof in order to prevent chlorine dioxide fumes from entering the plant room. The tanks are very large in order to cope with peak demands. This does however mean that water can be standing static in them at other times, so it is important to be able to monitor this water for chlorine dioxide level to ensure residual levels do not drop too low.

To enable this, we installed a tank recirculating line with a chlorine dioxide residual analyser. This constantly monitors the levels of chlorine dioxide and tops them up when they drop below a predetermined level.

The system has now been up and running for a period of time and the client has been very pleased to now be recording consistent levels of chlorine dioxide throughout the site. This has remained steady at all times, regardless of how long it has been since a large audience attendance.

Further Case Studies

Major UK Stadium Case Study

Case Study: Stadium water supplyThe dosing of water supplies with chlorine dioxide is a very common and effective method of preventing Legionella within buildings and facilities. Prodose has recently specified and installed a chlorine dioxide generation system in a...

read more

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Is the chlorine dioxide dosing system within your facility providing you with sufficient residual levels to be sure your employees or visitors are protected at all times? If you have any doubts about the effectiveness of your system, or would like to find a smarter way to control your chlorine dioxide dosing, please get in touch with us. We can cover every aspect, from initial consultation to final commissioning of a new system.

Bagged Salad Producer

Bagged Salad Producer

Bagged Salad Producer

A supplier of bagged salads approached us in 2015 to see if we could help them streamline their disinfection process and save costs.

The company produces various products for a number of clients. This includes privately labelled items for some well-known supermarkets.

They had a total of seven washers plus one plunge bath. The latter was used to wash a variety of salad leaves, shredded carrots and cabbage. At the time, they had tried various disinfection methods.

First steps

Initially, we undertook a small trial involving just one washer. The aim was to see how we could control the disinfectant levels of water in the machine using commercial sodium hypochlorite as a disinfectant and citric acid to maintain optimum pH levels.

We were able to prove that a better designed system would perform more reliably, and that as a consequence the level of microbial reduction was more consistent compared with previous techniques.

Main project

Following this success, the main challenge for Prodose was to provide a full-scale system that would control the levels of disinfectant in all seven washers and the bath, with each of these systems being individually monitored and dosed.

Cost savings

We installed the Ampro electrochlorination system. This enabled the client to manufacture sodium hypochlorite from salt on site as required. This had the benefit of reducing their dependence on chemical suppliers and helped to cut costs, given the relatively low cost of salt.

This low strength sodium hypochlorite solution is also relatively pH neutral, so we also installed a small citric acid dosing system in order to maintain pH levels. This also helped improve reliability by reducing the fluctuations in pH level.

Downtime reduced

In order to minimise downtime, the system was designed to treat the incoming water with sodium hypochlorite and citric acid as it entered the machines. This ensured that the water feeding each individual washer had a level of residual disinfection in line with the requirements of the produce being washed.

The fact that incoming water was at or close to the required levels of disinfectant had the effect of massively reducing “dwell time” – those periods during which the system pauses and waits for the dosing process to add more disinfectant to the water.

Constant monitoring

The washers were fed from a cold-water storage tank. This tank was fitted with a combined pH and free chlorine residual analyser. The system used the data fed back from this device to control the addition of sodium hypochlorite and citric acid, ensuring it was constantly maintained at the correct level before the water was distributed to the washers.

Each washer was then fitted with a free chlorine residual analyser, a device to measure the chlorine levels in the water. Each of these devices monitors the chlorine levels constantly.

As chlorine is consumed, a control algorithm calculates how much disinfectant is needed to replace it and activates a sodium hypochlorite dosing device, which adds a controlled amount of chlorine into each washer.

Data for traceability

The client could now use data from the system to evaluate how well it was performing, and to archive for future reference. Should there be any issues regarding contamination of products after they left site, the client would be able to produce records to demonstrate that the disinfectant level had been maintained on a specific date.

As well as the peace of mind from having a fully traceable system, the client was now able to achieve a higher level of productivity, as well as minimising costs from only having to purchase salt.

Overall, a this has been a very successful project – and something we can replicate for any food processor who currently does not have an automated disinfection system.

If you are interested in upgrading your system in this way, please get in touch with us at Prodose. We’d be very happy to talk to you confidentially and on a no-pressure basis.

Further Case Studies

Major UK Stadium Case Study

Case Study: Stadium water supplyThe dosing of water supplies with chlorine dioxide is a very common and effective method of preventing Legionella within buildings and facilities. Prodose has recently specified and installed a chlorine dioxide generation system in a...

read more

Bagged Salad Producer

A supplier of bagged salads approached us in 2015 to see if we could help them streamline their disinfection process and save costs. The company produces various products for a number of clients. This includes privately labelled items for some well-known supermarkets....

read more

Recent Articles

What part does chlorine play in food safety?

What Part Does Chlorine Play In Food Safety?21st century food production, processing and delivery relies on a constant source of clean water to disinfect machinery, containers, work surfaces and the products themselves. This prevents the spread of foodborne diseases....

read more

New Salad Project

New Project Bagged salad producer approaches Prodose.We’ve just received a new order from a producer of pre-bagged salad. It looks like this project will be an interesting case study for any similar food supplier. This client currently uses three flume washers to...

read more

Focus on Food Washing

Food washing: Do you monitor your disinfection levels?In the food industry, it is common for food suppliers and processors to disinfect fruit, salad leaves and vegetables by washing them in water that has been treated with disinfectant. This is an essential part of...

read more

If you are interested in upgrading your system in this way, please get in touch with us at Prodose. We’d be very happy to talk to you confidentially and on a no-pressure basis.