Abstract: A process of monitoring a waste stream for metal levels and metal precipitating agent levels is provided.

Abstract: A system for controlling the injection of wastewater treatment chemicals into a wastewater treatment stream includes a holding tank for collecting and holding wastewater being treated, a camera positioned for making images of the wastewater in the holding tank, a computer for automatically making the images of the wastewater in the holding tank at scheduled intervals. The computer analyzes the images in order to determine the necessity for injecting wastewater treatment chemicals into the wastewater stream by measuring the size, distribution and number of pixels of differing colors and appearances, such that pixels of differing colors and appearances represent differing metal moieties in the wastewater stream. A pump and injection port injects wastewater treatment chemicals into the wastewater stream responsive to the analysis of the images indicating the necessity of such injection.

Abstract: A system for controlling the injection of wastewater treatment chemicals into a wastewater treatment stream includes a holding tank for collecting and holding wastewater being treated, a camera positioned for making images of the wastewater in the holding tank, means for automatically making the images of the wastewater in the holding tank at scheduled intervals, means for analyzing the images in order to determine the necessity for injecting wastewater treatment chemicals into the wastewater stream, comprising measuring the size, distribution and number of pixels of differing colors and appearances, such that pixels of differing colors and appearances represent differing moieties in the wastewater stream including unreacted waste products and unreacted wastewater treatment chemicals, and means for injecting wastewater treatment chemicals into the wastewater stream responsive to the analysis of the images indicating the necessity of such injection.