Step 1: Optimisation
The calculated sludge water quantity from all circuits, determined according to DIN (6m³/m², 2 x a week), amounted to approx. 14,000 m³/a. This compared with an actual total water consumption in pool water treatment of approx. 27,000 m³/a, in other words, twice as much. To find out the reasons for this high water consumption, the entire technical system was examined.
This resulted in a plan for optimising the overall system, including the following individual steps:
Repair of defective fittings and pipes
- Leaking fittings replaced
- Pipes repaired
Optimisation of the filter process by removing the existing overhead rinsing and adjusting the process stages.
- Replacement of the filter sand and alteration of
- the layer structure
Optimisation of the filter controls (time and load-dependent operation)
- Installation of frequency converters on the circulation pumps to reduce electricity consumption
These steps alone reduced the water consumption by some 20%. After the optimisation, the quantity of rinsing water capable of recycling that remained was 13,650 m³/a.
Now it was possible to select a sludge water treatment plant one size smaller. Apart from the lower investment cost for the plant itself, this resulted above all in lower overheads:
That's because waste water that is saved does not lead to any treatment costs!
Step 2: Sludge water treatment
Treatment takes place in the stages ultrafiltration with chlorine-stable ceramic membranes, active carbon filtration, partial flow reverse osmosis and finally UV radiation to avoid secondary contamination.
The reverse osmosis stage was designed according to the existing analysis data. The key parameters here were the nitrate content and the hardness of the pool water. The nitrate content had to match that of the filling water from the water mains. Simultaneously it had to be ensured that the flocculation during pool water treatment would not be disrupted by the addition of too much softened water. The currently installed share of approx. 30% reverse osmosis water in the total top-up water means that good flocculation filtering is achieved without adding hardeners.
The plant runs fully automatically and is monitored remotely by modem.
All that's left for the staff to do is to clean a hair screen once a week and to ensure the operating substances are provided in the plant. The complete covering ensures that all component parts are well protected from external influences.
The combination of the two optimisation steps leads to an optimum savings potential:
- smaller quantity of rinsing water
- maximum savings in drinking water consumption
- optimum plant size
- lower loan costs
- maximum overhead savings.
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