WASTEWATERBy Rick LallishWhat is the carbon:nitrogen:phosphorus ratio required for bacterial growth?A. 200:50:25B. 1:5:1000C. 100:10:20D. 100:5:1Answer: D. The population of microorganisms, or algae in lagoon systems, depends on the amount of carbon, nitrogen and phosphorus available. The universally accepted ratio is 100:5:1. If you lack one of these elements, that would be considered a rate-limiting factor and your facility will have difficulty achieving proper growth of organisms. This factor is a good troubleshooting step. More information may be found in the OWP CSU-Sacramento textbook: Operation of Wastewater Treatment Plants, Volume 2, Eighth Edition, Chapter 2.DRINKING WATERBy Ron TrygarWhich membrane classification can
