Pressure-based respirometry
Our respirometer measures pressure changes associated with microbial respiration, activity, and growth, within an airtight container, utilising membrane protected sensors, so preventing corrosive gasses or liquid contact, reducing maintenance, and eliminating fouling and calibration.
Proprietary algorithms are generated from various characterisics of the respirograms and a number of outputs are communicated as operational information. A primary function is calculation of real-time BOD, normally taking 5 days in a laboratory (unsuitable for process control).
Following interpretation and intervention of algorithms, the technology will output to a local user inteface showning Process Status (plus red, amber, green indication) plus measured parameters as real values, graphed vs time as a visual change indicator. ​
Calculated values for recommended aeration requirement are generated too.
​Outputs (digital or analogue) can communicate with SCADA systems for advanced closed loop control where appropriate.
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Aeration control sytems can easily accept Inneauvates inputs which are designed to “mimic” DO probe inputs for the purpose of integration with customers existing systems.
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Correct Oxygen delivery is a very important parameter for successful wastewater treatment because degradation of organic matter, and conversion of ammonia to nitrate (“nitrification”) is achieved by aerobic bacteria. Sufficient aeration is essential however over-aeration impacts heavily on directives for a “Net Zero” commercial target.
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Nitrifying bacteria are strongly influenced by oxygen concentration. At between one and two mg/l O2 , activity levels off. At concentrations higher than 3 mg/l, bacteria show no significant increase in activity, meaning this extra Oxygen is being added for no reason.
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Dynamic measurement of oxygen demand can be used to limit under and over- aeration, and indeed influence the correct strategy to deliver oxygen when and where needed within the process.
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