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Our range of Sewage Treatment Technologies cover the entire Water Cycle:
Water intake – pumping
Sewage is collected through a sewerage network – a system of cement, concrete, steel, cast-iron or plastic pipes / collectors. This network transports wastewater collected from households and businesses to a wastewater treatment plant where sewage treatment technologies can be deployed.
Pre-treatment eliminates floating matter from the wastewater, as well as sand and grease that can have an adverse impact on the efficiency and performance of downstream treatment processes. Our sewage treatment technologies for pre-treatment include:
- HYDROTECH drum and disc filters
Primary treatment uses gravity to recover pollution that is naturally settleable and colloidal before the water is fed to biological treatment. Reagents can be used (but are not always needed). Our sewage treatment technologies for primary treatment include:
- HYDROTECH disc and drum filters
Secondary biological treatment
Secondary sewage treatment technologies are based on bacteria targeting dissolved and colloidal matters, such as carbon, phosphorous and nitrogen, as they multiply. Secondary treatment needs to be monitored and controlled so that bacteria develops at an optimum level. Our sewage treatment technologies for secondary treatment include:
- ANOXKALDNES HYBAS™
- ANOXKALDNES MBBR
- BIOSEP™ / NEOSEP™
Tertiary treatment helps the feedwater comply with the most stringent parameters. It is employed to eliminate micropollutants and endocrine disruptors by physical and/or physical-chemical processes. It also optimises downstream disinfection processes (such as chlorination, UV). Sewage treatment technologies used in tertiary polishing include:
- ACTIFLO CARB
- HYDROTECH discfilters
If re-use is intended, further upgrading of the feed water is possible using settling, filtration and/or membrane filtration. These technologies meet the most stringent water standards. Our technologies for membrane filtration include:
- BIOSEP™ / NEOSEP™
- Microfiltration / Ultrafiltration / Reverse Osmosis
Sludge is the solid contents left over by the previous biological treatment steps. It needs to be regularly removed from the feed using a range of sewage treatment technologies tailored to the nature of the sludge and its intended use. Technologies for treating sludge include:
- SOLIA™ MIX
Veolia has a range of methods for dealing with odours. Polluted air generated during the sewage treatment process needs to be continuously extracted. Our odour controlling technologies include:
- ALIZAIR™ / ALIZAIR™ PACKAGE PLANT
Once the water has been treated according to the treatment steps outlined above, it is ready to be returned to the natural environment, and can be directed to rivers, lakes, storage tanks, etc.