Successful expansion of a wastewater treatment plant

Five tons of BOD5 and high concentrations of nutrients and calcium were found in the wastewater of a dairy in Bavaria – at a level of 2,100 cubic metres per day. Since the batches in production change constantly, the degree of contamination and the pH value of the wastewater also varied greatly. This resulted in high wastewater fees. In order to significantly reduce these costs, the management of the dairy factory in 2004 decided to expand the wastewater treatment plant which had been in operation since 1993. This had also been supplied by H+E. The objective was to discharge the treated wastewater into a nearby river. The limit values of the wastewater regulations, however, required a significant reduction in the pollution load.

A proven solution

For this customer, H+E developed a plant extension based on the excellent operating experience with the existing plant. Wastewater streams with a high solids load are pre-treated by straining and flotation, and then collected, mixed, equalised, and neutralised in the buffer tank. The activated sludge process is divided into anaerobic, anoxic, and aerobic areas. This ensures that organic pollution, nitrogen, and phosphorus are eliminated to the greatest possible extent.

Process combination used

The high calcium concentrations in dairy effluents often lead to precipitation which can seriously damage the aeration system. For this reason, our experts chose the robust AEROFIT®.D aeration system developed by H+E for the expansion of this wastewater treatment plant. The activated sludge is treated in an aerobic digester for stabilisation. The nutrient-rich sludge, which contains only harmless substances, can then be used in agriculture.

Facts & figures:

  • Discharge values far below the legal limits
  • The local wastewater regulation requirements are consistently complied with
  • Pollutant-free sludge
  • Sludge usable on agricultural land

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Successful expansion of a waste watertreatment plant

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Significantly lower wastewater fees: a dairy in Bavaria achieved this goal thanks to H+E’s expansion of its existing wastewater treatment plant.

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To increase the existing wastewater treatment plant’s performance, H+E implemented an anaerobic ANAFIT®.R2S reactor and a flotation plant at Farm Frites.


Customised service for reliable operation

24-hour hotline

  • Expert answers from the right contact person
  • Over the phone or on site

Maintenance service

  • Regular maintenance for a constant water quality
  • Support of third-party plants

Modernisation and optimisation

  • Of control systems and automation systems
  • Adjustment of chemical dosing during operation

Qualified advice

  • Audits for status checks
  • Consulting for process and plant optimisation

Service for anaerobic reactors

  • Functional testing and maintenance prior to official approvals
  • Review and recommendations for performance improvement

Servo – bundled expertise

  • For all process technologies and steps
  • Chemicals and working materials

Contact our experts

We are expanding our production, which means that our process and wastewater amounts will increase and their qualities will change.