Lift stations generally employ centrifugal pumps, pneumatic ejectors or screw type pumps, (centrifugal pumps are the most common). The wet well can be constructed of pre-cast concrete rings (similar to manhole rings), poured in place concrete, fiberglass or metal. It should be designed to withstand characteristics common in the wastewater it will pump. The wet…
The settleometer test yields a great deal of information about how well sludge will settle and compact, but it does not reveal the MLSS concentration. It would seem obvious that if the MLSS concentration increases, the settling rate would slow down. (That is; thicker mixed liquor should settle more slowly). To some extent, this holds…
Preliminary Treatment – A treatment process consisting of screening and grit removal before the wastewater flows on to other treatment processes. Primary Treatment – A treatment process that usually consists of clarification by solid-liquid separation that removes a substantial amount of suspended and floating matter. Secondary Treatment – A treatment process that uses biological processes…
Detention time is expressed in units of time. The most common are seconds, minutes, hours and days. The simplest way to calculate detention time is to divide the volume of the container by the flow rate into the container. The theoretical detention time of a container is the same as the amount of time it…
Tools used for rodding include all but the _. a. lag screw b. porcupine c. root saw d. square bar cork screw Areas subject to higher than normal vandalism are usually _. a. along heavily traveled streets b. secluded, out of the way buildings c. well-lighted, visible areas d. none of the above How does…
Wastewater Certification Exam Quiz: 1. What is the main component of a control system? a. resistors b. sensors c. relay switches d. fuses 2. Successful flocculation is preceded by _. a. good mixing b. pressurization c. heating d. raising the pH 3. On a large scale, which is the best method for removing ammonia nitrogen…
On Wednesday, September 16th Wastewater 101 spent the evening at the Blutcher Poole Wastewater Treatment Facility in Bloomington, Indiana. It is always a pleasure when we go to Bloomington – either Blutcher Poole or Dillman Road plants – because they are so eager to participate and learn something different. This time we discussed The Microlife…
Time to start thinking about getting your application ready for the IDEM Operator Certification Exam. Due Date is August 19th, Test Date is October 3. You can find the application at: http://www.in.gov/idem/5088.htm
The EPA has released its “Integrated Municipal Stormwater and Wastewater Planning” Frequently Asked Questions and Answers. Click Here to get more information.
