Wastewater Grade 1 m/c

Wastewater Grade 1 m/c When taking a coliform sample from a chlorinated secondary effluent one should : Ans- Make certain that sodium thiosulfate was added to the sample bottle before it was sterilized . To kill chlorine residual The main components of anaerobic digester gas are: Ans- Methane and carbon dioxide The main function of algae in a facultative wastewater treatment pond is : Ans- to produce dissolved oxygen which is used by aerobic bacteria. Coliform bacteria are: Ans- often recorded on NPDES reports as MPN per 100mL Organic loading to a stabilization pond is usually expressed as : Ans- lbs of BOD per day per acre A so-called "thief hole" is a device most often associated with a/an: Ans- anaerobic digester The volatile acid/alkalinity ratio is important to the operation of : Ans- an anaerobic digester Which one of the following statements is true in regard to the concept of pH? Ans- Bacteria in wastewater generally function well at a pH near 7.0. The Imhoff cone is used to measure : Ans- the volume of settleable solids in units of mL/L When sampling to determine the average final effluent solids concentration in the final effluent: Ans- a 24-hour flow proportional composite sample should be used. Which one of the following is considered to be part of the preliminary treatment process? AnsComminutor Which one of the following pollutants would be removed to the least extent in a well-operating grit chamber ? Ans- colloidal solids Daily monitoring of a facultative pond would most likely include: Ans- DO, temperature, and pH A primary clarifier is generally considered to e a unit designed to remove: Ans- settleable solids which one of the following terms IS NOT associated with a rectangular primary clarifier: AnsProportional weir Hydraulic loading to a stabilization pond is usually expressed as : Ans- inches/ day Photosynthesis is a process that : Ans- utilizes sunlight to generate dissolved oxygen from carbon dioxide Good facultative pond performance depends mostly on which one of the following? Ans- weather and climate The primary purpose of disinfection of wastewater is to Ans- kill the pathogens The purpose of a chlorine contact tank is to provide : Ans- sufficient contact time for disinfection Usually a trickling filter is considered to be a/an: Ans- aerobic treatment process A "injector" is a device most often associated with a/an: Ans- vacuum chlorinator which one of the following terms is NOT usually associated with the anaerobic digestion process? Anssymbiotic relationship The BOD test: Ans- is a measure of the organic strength of wastewater An operator may have his or her license revoked if he or she:: Ans- willfully or negligently violates the Title 23, "regulations for wastewer treatment plant operator certification and plant classification". Submits false or misleading info. on a certification application. engages in dishonest conduct during a certification exam