| 摘要(英) |
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. While automatic control has become a must for water and wastewater treatment systems to meet the requirements and needs of 21st century, 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 (i.e. webcam), and image processing with triangulation. In addition to water level or flow rate, the photo spectrum of the image can be used with Beer-Lambert’s law to obtain the concentration of suspended solids. A prototype system was built and tested on a laboratory-scale automatic controlled continuous flow sequential batch reactor (CFSBR).According to real test and verification result, the mean error percentage of water levels and flow rates is about 1% (about 60 cm) in CFSBR reactor; And measuring SS in anaerobic phase、aerobic phase、anoxic phase and effluent flow, its mean error respectively for 9.21% - 8.06% - 7.43% - 35.99% (max 8000 (mg/L), min 2 (mg/L) ). It is enough to explain the amount of laser optical image utilized to measure SS and have certain feasibility and exactness. To process system of the general waste water, can not merely offer immediately correct SS information, can also monitor information of SS immediately, the data immediately will be passed back to utilize the wired or wireless network, 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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