Endress+Hauser has introduced a new aeration control solution to optimise aeration times in the biological treatment stage in wastewater treatment plants.
The outstanding features of the solution are:
* Load-dependent control.
* User-friendly interface.
* Guaranteed reliable outlet quality.
* Reduced energy consumption.
In municipal waste-water treatment plants, the primary focus is on protecting downstream bodies of water. The biological stage, in which pollutants and nutrients are decomposed, is particularly energy hungry. “For many wastewater treatment plants, efficient aeration control means enormous potential for energy savings,” says Christoph Herb, the expert in charge of wastewater simulation and customer processes at Endress+Hauser.
Liquicontrol CVDC80 – energy efficient aeration control
Interest in the Liquicontrol CDC80 is phenomenal. It provides dynamic, load-dependent control of aeration in the basin as well as the oxygen set value, depending on the ammonium load. As a consequence, the energy-intensive aeration runs exactly as required for optimum ammonium cracking. The results from pilot installations have been remarkable. Energy consumption has been optimised while operating costs have been lowered with absolutely reliable outlet values that have even been improved in some cases. This is also confirmed by Michael Szegedie, plant manager of the wastewater treatment plant in Waldhausen, Germany. “After just a few weeks, we saw that we were able to operate the system at a very stable level while almost halving aeration times. Obviously, this saves energy.”
Liquicontrol CDC80 is based on a programmable logic controller, which, together with Profibus protocols, makes integration into existing systems easier than before. “I was amazed by how fast and smoothly it went. Within a few hours, the controller was up and running,” says Szegedie, whose wastewater treatment plant was one of the first to benefit from the new aeration control.
In addition to easy commissioning, Endress+Hauser has placed great value on user friendly operation. For example, as early as the development stage of Liquicontrol, intuitive menu guidance and graphic measured value display was included. In addition, the system operator can throw a switch to select between manual and automatic mode, thus retaining full control over the process at all times.
On request, Liquicontrol CDC80 can control not only the aeration times, but also the phosphate precipitant in load-dependent form. “This optimises the use of precipitant and improves the sludge parameters,” explains Herb.
The solution is so well received that even initial applications in industrial processes (e.g. food) are being implemented. Herb says that the optional remote access contributes to this success. This gives treatment plant staff the ability to manage the measured values and parameters independently of location and weather.
The measurement instrument that works with Liquicontrol CDC80 is Memosens technology developed by Endress+Hauser, now a de facto standard in process analytics. This allows, for example, calibration data or plausibility messages to be transmitted digitally from the sensor via the controller to Liquicontrol. Sensors equipped with Memosens can also be pre-calibrated and connected via plug-and-play, thereby reducing the work in the process. Teaming the Liquicontrol CDC80 with instruments using Memosens technology forms a win-win solution for wastewater treatment plants to optimise their processes while achieving greater cost savings.
Blue and Green Drop certification
Blue and Green Drop Certification regulates South Africa’s water supply, i.e. Blue Drop certification for drinking water quality management and Green Drop for wastewater.
These two programmes identify a series of core competencies across every component of water treatment and they use both incentive and risk based regulations to encourage development of these competencies. The aim of the programmes is to ensure the effective and efficient delivery of sustainable water services. Meeting this goal means making sure that South Africans have enough healthy water to drink and sufficient clean water to irrigate our crops, run our industries, and avoid polluting our natural water systems.
In order to achieve and maintain wastewater effluent quality and reliable Green Drop values, rugged and dependable process measurement are required that are also cost-effective. Endress+Hauser has mastered this challenge with precise, traceable, high quality instruments and solutions such as the Liquicontrol CDC80 combined with Memosens technology. This provides a full range of instruments for the water and wastewater industries from a single source, and, if required, support from project inspection to the final testing of water quality.
For more information contact Hennie Pretorius, Endress+Hauser, +27 (0)11 262 8000, [email protected], www.za.endress.com
| Tel: | +27 11 262 8000 |
| Fax: | +27 11 262 8062 |
| Email: | [email protected] |
| www: | www.endress.com |
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