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Sludge level of the secondary sedimentation tank is an important technique parameter affecting the final result of activated wastewater treatment processes. A sludge level meter is usually fixed on the rotary or shuttlecock scraper, so it is difficult to transmit the measured data to the main control unit through a wired connection. This paper presents a wireless data communication solution which is based upon Bluetooth technology. The wireless sludge level monitoring system's topology, hardware and software design are included.
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