More than 70 % of operating costs of a wastewater treatment plant are related to energy costs, arising when the aeration tanks are provided with air. The combination of blower, turbo and hybrid technology from Aerzen has offered an efficient solution in the industry until now. However, with Aersmart, the control combination from this company, performance can now be sustainably increased even further.
Machine control system increases efficiency
Even better performance in the aeration tanks
More than 70 % of operating costs of a wastewater treatment plant are related to energy costs, arising when the aeration tanks are provided with air. The combination of blower, turbo and hybrid technology from Aerzen has offered an efficient solution in the industry until now. However, with Aersmart, the control combination from this company, performance can now be sustainably increased even further.
The load operation in organic wastewater treatment plants is subject to considerable fluctuations. Effluent flows and the degree of contamination may vary depending on the region, the time of day, the day of the week, the time of year or the quantity of precipitation – and this variation can be quite significant. With its high-performance compressors Delta Blower, Delta Hybrid and Aerzen Turbo, Aerzen offers a very good portfolio for the oil-free oxygen supply of the aeration tanks for this field of application. Thanks to the diversity of product types, these three packaged units are tailored to the requirements specified by various plants. This combination guarantees a performance, which is designed to meet precisely the demand of changing load profiles – from base loads to supply peaks. Each technology, regardless whether it is a displacement machine or a turbo machine, has its strengths and weaknesses. With the focus on energy efficiency, the nominal point of the turbo blowers cannot be beaten. The control range is approximately between 40 and 100 %. In case of part-load operation, turbo machines are less efficient. On the other hand, displacement machines, such as Delta Blower and Delta Hybrid are ideal for part-load operation. They are strong in high control ranges between 25 and 100 % and have good efficiency, also in part-load operation.
Perfect interplay of up to 12 machines
With the machine control system Aersmart, now unveiled at Ifat in Munich, it is possible to arrange volume flows amongst the machinery in a mode that low, medium and high loads can be processed efficiently as per existing configuration, whereby the characteristic diagrams and the efficiency levels are integrated in the algorithm of the control system. As a consequence, the installed machinery is operated very close to the theoretical highest efficiency level. Even third-party products can be controlled via the overriding control system. Aersmart can arrange for the highest efficiency by a perfect interplay of up to 12 machines.
The machine control system operates as follows: The required oxygen volume is transferred to the machine control system as setpoint value e. g. as 4…20 mA signal or via bus connection. Aersmart allows interaction of the existing machine configuration, leading to an oxygen supply of the aeration tanks along the required load curve in an efficient way, very close to the optimum. Furthermore, unit data including pressure, volume flow, temperatures, energy consumption and fluctuating loads, as well as the machine data including service intervals, can be recorded sustainably and transferred to the control centre or other systems for further processing. So, changing requirements and possible ageing effects of the aeration system can constantly be monitored. This creates unprecedented transparency over the entire life cycle and provides the possibility for targeted measures.
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