| Summary: | 碩士 === 國立中央大學 === 環境工程研究所 === 98 === The influent and effluent flow rates or the water levels of reactor, tank or conduit are key parameters for automatic control of water and wastewater treatment processes and systems. The measuring techniques used today for automatic monitoring of flow rate or water level remain unsatisfied or disqualified with accuracy, disturbance, maintenance and cost issues. To effectively solve the problem, a low cost and high accuracy non-contacted real-time water level or flow rate measuring technique was developed for reactor, tank or conduit, using consumer-grade laser diode, CCD camera, and image processing with triangulation. A prototype system was built and tested on industrial park wastewater treatment plant. According to real test and verification result, the mean error percentage of water levels and flow rates is about 0.308 cm in conduit. Using red laser diode and green laser diode to measure suspended solid in chemical coagulation treatment tank and discharge outlet conduit, its mean error respectively for 1.3 mg/L. Beside, using virtual monitoring technique to measure chemical oxygen demand in chemical coagulation treatment tank, its mean error respectively for 1.3mg/L It is enough to explain the amount of laser optical image utilized to measure SS and have certain feasibility and exactness. It can offer immediately correct SS information, can also monitor information of SS immediately, as using with controlling immediately of early warning system of process system of waste water, in order to improve the effect of the waste water with automatic process system.
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