xiv UK FOCUS Automation of nitrogen removal from wastewater enables compliance with
limit values, stable plant operation and optimises energy consumption Optimum nitrogen reduction requires optimum coordination of the nitrification and denitrification processes. On the one hand, this involves controlling oxygenation during sludge activation in accordance with the load and the individual limit values. On the other hand, it involves coordinating the duration of the nitrification and denitrification phases. Endress + Hauser’s Liquiline Control system will assist you here, ensuring that nitrogen is removed and optimising the amount of energy required to do so.
The main components of nitrogen are ammonium and nitrate. In the biology of a wastewater treatment plant, bacteria converts the ammonium to nitrate through the addition of oxygen (nitrification). This continues until there is (almost) no ammonium left.
Other bacteria then convert the nitrate to molecular nitrogen (denitrification). This simply escapes into the atmosphere and is therefore eliminated from the wastewater. Incidentally, no more oxygen is added during the denitrification process. This to ensure that the bacteria consume the oxygen present in the nitrate.
The key issue is to establish when and how much oxygen is required for nitrification in order to achieve an optimum level of nitrogen reduction. The oxygen is injected into the aeration basin using compressors. These require enormous amounts of electricity – up to 70% of the entire energy requirement of a plant. If too much oxygen is added, energy and money are wasted. If too little is added, the outlet values deteriorate.
The Liquiline Control system can control the reduction of ammonium and nitrate based on the influent load. Depending on the nutrient concentration, the system controls the influx of air into the aeration basin, e.g. by regulating the speed of the compressors. This is regardless of whether the biological phase is operated continuously or intermittently.
The measured values taken into account are oxygen in the nitrification phase, ammonium (and nitrate, if necessary) in the transition zones as well as the quantity of wastewater currently flowing through the wastewater treatment plant. The transition zones include the zones between the nitrification and denitrification phases as well as the zones at the inlet and outlet of the biological phase.
ABB wins prestigious Red Dot Award for the product design of its new ultrasonic level transmitter
The target oxygen value, and therefore the influx of air into the aeration basin, is adapted dynamically to fluctuations in the influent load. At night time, during low-load phases, only a small amount of air is injected; during load peaks, such as surges during wet weather, more air is injected. In the case of intermittently operated plants, minimum times or the nitrification and denitrification phases are also taken into account.
The automatic adjustment of the oxygen target value in your aeration basin ensures ideal nitrification and denitrification times and simultaneous control of several biological phases that can be operated on a continuous or intermittent basis. For safe compliance with your prescribed outlet values - even during high load peaks, high transparency and easy handling of the nitrogen removal process and energy optimised operation of your wastewater treatment plant, the Liquiline System is an indispensable tool.
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New analyser takes multitasking
with water analysis
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— Open up a new world of water analysis ABB’s range of EZLink digital pH sensors
Our family of digital pH sensors makes it easier than ever to find the right device for your needs. Three distinct colourcoded ranges give you everything you need, from entry level for basic requirements through to specialized devices for specific sectors. • Plug-and-play digital sensor connection • Sensor healthcheck helps maximize sensor lifetime
• Enhanced measurement accuracy for fast temperature response
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IET SEPTEMBER/OCTOBER 2021
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The design award has been granted to ABB in recognition of an innovative product which increases accuracy and optimizes performance in industrial water processes.
ABB’s LST200 ultrasonic level transmitter was awarded best in category for physical, as well as technical, design. The winning ABB transmitter is particularly notable for solving the surface condensation challenge often faced by process owners, where a buildup of water has historically affected accuracy of essential plant readings. The LST200 uses active surface technology known as a “Lotus Effect” whereby surface liquid will fall off before it pools into larger droplets that could then cause problems, offering an efficient and cost- effective solution.
The Red Dot Award is a highly regarded international design prize which began in 1955. More than 15,000 admissions are submitted annually from over 70 countries around the world.
The Red Dot Awards jury said “This robust level gauge impresses with a simplicity that has been thought through down to the last detail. It presents itself as a proven means of ensuring efficiency and reliability.”
to a new level Anyone who works on several tasks at the same time as a multitasker will love it. The new SD 335 Multi is available and can measure several parameters simultaneously. However, the multi-talent for electrochemical measurements can do even more in water analysis. It literally follows the user at every turn, even in demanding environments. Lovibond®
has designed the instrument
specifically for a wide range of requirements and applications.
The SD 335 Multi masters all the important parameters for wastewater treatment, pool water control, routine work in specialised laboratories, boiler and cooling water, the treatment of drinking water, the control of water pollution or for research applications. Two parameters and additionally the temperature can be measured simultaneously from a comprehensive range: pH, ORP, conductivity, TDS, salinity, dissolved oxygen (concentration and saturation).
The SD355 Multi features galvanically isolated measuring inputs, robust armouring including 2 electrode holders, a data logger with up to 8 GB data memory, easy data transfer via Micro-USB in CSV format, graphical, multi-parameter display and intuitive user interface in 7 languages and rechargeable NiMH-batteries. Operators can be walked through the simple, step-by-step calibration and there is even a convenient belt clip for mobile usage. The SD 335 Multi is offered in 3 different sets for the most diverse requirements.
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