Studies conducted to identify I & I can be very elaborate involving engineering consultants and costing large amounts of money or they can be basic and conducted by system operators. The size of the system and the extent of the problem will dictate what measures are necessary. Methods that are commonly used for identifying the…
It is often very hard for non-operators to understand that the mixed liquor represents a mass of living organisms! This is the reason that so many people react as they do when viewing mixed liquor under a light microscope for the first time. It is not at all unusual for people to respond with surprise…
A force main is the discharge line for the lift station. The discharge lines of the pumps come together in a manifold and then enter the force main. Air accumulation in force mains can create a problem know a water hammer, which is a high pressure shock wave that travels up and down a force…
Ratio and Proportion A ratio is the relationship between two numbers. A ratio can be written using a colon such as: 1:2, 5:9, 20:60 or as a fraction 1/2, 5/9 or 20/60 A proportion exists when the relationship between one ratio is the same as the relationship between the second ratio. To determine if the…
1. What determines the amount of hydrogen sulfide produced in a sewer? a. BOD concentration b. D.O. concentration c. pH d. SS concentration 2. Four conditions are necessary to create an explosion. Three of these conditions are: combustible gas, adequate oxygen and sufficient heat. The fourth is _. a. constant supply of combustible gas b….
Questions: 1. Bar racks and bar screens have clear spacing respectively of _. a. 0.25 to 2.0 inches and 2.0 and 4.0 inches b. 0.2 to 1.0 inch and 1.0 to 2.0 inches c. 2.0 to 4.0 inches and 0.25 to 2.0 inches d. 1.0 to 2.0 inches and 0.2 to 1.0 inches 2. The…
For Operators in Indiana, this e-mail was sent by Mark Stanifer, Chief of Compliance Branch, Office of Water Quality: Our rule was published in the Indiana Register yesterday for first notice. Here is the link: http://www.in.gov/legislative/iac/20180829-IR-327180365FNA.xml.pdf The comment period deadline is September 28. This notice only very broadly says what the proposed rule changes are intended…
Disinfection – A process used to destroy most pathogens in the effluent to a safe level. Disinfection does not destroy all microorganisms. Biosolids – The nutrient-rich, organic byproduct of a municipal wastewater treatment plant that is utilized as fertilizer. Process Control – The tools and methods used to optimize treatment plant operations. Return Activated Sludge…
Because of the time delay involved in generating the data used to determine the F:M ratio, it is not used to control the secondary treatment process. The mean cell residence time (MCRT) approach to balancing the solids in the activated sludge treatment system offers a simple and effective way to operate the activated sludge process…
Because the failure of a lift station could result in damage to homes, property and the environment all lift stations should be equipped with some type of audible and visual alarm at a minimum. For large installations a computer will automatically contact operators in the event of a failure or the system will be monitored…
