German Water Board “Aggerverband” modernizes sewage plants and relies on Hiller decanter centrifuges 

The Aggerverband is a public institution in the German town of Gummersbach and is responsible for an area of 1,100 km² and the necessary measures for ensuring the water supply and distribution. A total of 31 sewage water plants ensure waste water clearing for approx. 370,000 inhabitants. 

For the plants to be modernized (KA Büchel, KA Krummenohl and KA Bickenbach) Hiller got the order for delivering new and modern dewatering technology. The modernization works took over three years’ time – the individual steps of the modernization had to be planned and performed one after the other. A total volume of about two million Euro has been invested in the machine technology. </p>

These steps enabled much more flexibility regarding sludge dewatering for the plants. However – the major argument was economic efficiency for the investment. The use of the most modern decanter centrifuges now lowers the operating costs on the mentioned plants. 

Before these steps were taken only chamber filter presses were used. However, this technology did not meet the flexibility requirements of Aggerverband, anymore. 

The most important and strongest argument for the change in technology was the economic efficiency of the dewatering decanter
With a number of dewatering tests and comparisons in economic efficiency of today’s technology Hiller has defeated the conventional technology with their highly modern dewatering decanters. Now these machines ensure an effective, continuous and 24 h sludge dewatering – if necessary. This reduces the organizational work substantially when compared to the old process. 

Cost saving effects in dewatering technology: Hiller delivers concept for three sewage water plants 
The dewatering concept with the Hiller decanters finally has been used for all three plants. By the caused synergistic effects the customer could save money and time in addition. Also the administration work could be reduced by the cooperation with only one supplier for all three plants. By choosing the same plant technology on all three sewage plants the operating staff can switch between the plants if required in cases of sickness or holidays. Furthermore Hiller offers complete solutions and thus time could be saved in project management. Another substantial economic advantage is that due to the same machine concept on all three plants also the costs for spare parts and maintenance will be reduced. 

The investment will pay off already in only a few years.

The Aggerverband is very happy with the modernization and the cooperation with Hiller has been very smooth. 

(Persbericht Hiller GmbH, september 2016)