Abstract: The present invention relates to a water quality measurement system based on a high performance optical fiber probe, and more particularly relates to a water quality measurement system based on a high performance optical fiber probe that immerses an optical fiber prove inducing an ultraviolet light into contaminated water distant from the measurement device, irradiates the light, collects the reflected fluorescent lights, and quantifies the contamination level using a spectrometer thereby.

Abstract: An Intermittently Decanted Extended Aeration (IDEA) process characterized in that an aeration period, a settling period and a decanting period are successively repeated in that order in a single reactor, and influent wastewater is transversely supplied at the bottom of the reactor and slowly diffused in the reactor while treated wastewater wich is intermittently discharged during the decanting period is provided. According to the process of the invention, wastewater can be efficiently treated without by-pass of wastewater under dry weather and wet weather conditions as well as stormy weather condition.