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Improvement of Energy Efficiency and Plant Performance in a Water Reclamation Facility in Chandler, Arizona Using Advanced Online Monitoring

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In December of 2000 the MAT2000 advanced on-line monitoring system was installed in the City of Chandler, Arizona Water Reclamation Facility for the purpose of providing the operations staff with ideas for potential power savings while maintaining the same quality effluent. The facility is designed for 10 MGD with daily averages of around 7.5 MGD with both nitrification and denitrification processes to achieve a total nitrogen limit of 10.0 mg/L.

The MAT(Mobile Analytical Trailer) provides information valuable to process evaluations such as diurnal load variations, biomass viability, flow distribution, aeration requirements, and the necessary retention time to reach complete treatment. The key to the MAT2000 technology is that the analysis is performed directly in the biological environment of the process providing information 24/7 which is accessible from remote locations via the Internet. The primary monitor within the MAT2000 is the respirometer along with a colorimetric ammonia monitor and a dissolved oxygen probe placed directly in the basin. The instrumentation allows for experimentation with the plant process in which results can be observed immediately without the delay of laboratory analysis or jeopardizing effluent compliance.

In May of 2001 the operators shut down two aeration basins, which is 1/3 of the aeration capacity and online data revealed limitations in the dissolved oxygen control regime and the basin distribution. From this a plan for an improved dissolved oxygen control system was put in place in which the blowers will be controlled by the air pressure related to motorized valves controlled by dissolved oxygen probes placed in the aeration basins. The data also displayed a need for a reduction in the dissolved oxygen control level for the current systems and a plan to change the ceramic diffusers to a EPDM rubber dome with a cap that allows for the air to be completely turned off without the concern for backflow into the airlines from the basin. The domes will also significantly increase the oxygen transfer efficiency. The ability to shut off the air also creates a potential to biological removal of phosphorous or extension of the denitrification capabilities.
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Document Type: Research Article

Publication date: 2002-01-01

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