Entries Tagged Licensing Exam

Studies show that some people fear speaking in public more than they fear dying. For many water and wastewater operators, licensing exams...

WASTEWATER By Rick LallishWhere can an operator look to find specific laboratory procedures and the proper compliance for those procedures?A. NPDES permitB. Wastewater textbooks, such...

WASTEWATERBy Rick LallishWhich of the following pumps would be the least effective for pumping heavy sludges?A. Progressing cavityB. Rotary lobeC. CentrifugalD. DiaphragmAnswer: C. Progressive cavity pumps...

WASTEWATERBy Rick LallishWhat is the correct way to express the organic loading rate on a trickling filter?A. Pounds of BOD per square foot...

WASTEWATER By Rick LallishWhat is the most common type of lagoon currently in use to treat municipal wastewater?A. AnaerobicB. AeratedC. PolishingD. FacultativeAnswer: D. The most common lagoon treatment system...

What safety concerns may be present in the preliminary treatment process? A. Hydrogen sulfideB. Waterborne diseasesC. Physical accidents/hazardsD. Explosive mixtures/gasesAnswer: A, B, C and D. The preliminary...

WASTEWATER By Rick Lallish While operating an automatic composite sampling device, you notice elevated TSS or BOD in the effluent sample. What could be...

WASTEWATER - By Rick Lallish Where do the bacteria obtain the necessary oxygen to survive in an anoxic zone? A. Remaining dissolved oxygen B. Nitrite...

WASTEWATER By Rick Lallish What condition occurs when the sludge age advances and there is less food available per bacteria? A. Flocculation B. Nocardia filaments C. Excessive...

WASTEWATER - By Rick Lallish During an afternoon plant walk-through, you notice a thin, light-tan foam covering approximately 10% to 25% of the aeration...

WASTEWATER By Rick Lallish What is the condition on a rotating biological contactor (RBC) that is identified by uneven shaft rotation, usually caused by...

WASTEWATER- By Rick Lallish What is the expected or recommended time it should take for the contents in an oxidation ditch to travel the...

WASTEWATER - By Rick Lallish What type of settled sludge digests the most efficiently in an anaerobic digester? A. Grit and manually removed screenings B. Primary...

WASTEWATER By Rick Lallish What is the maximum blanket level in a secondary (activated sludge) clarifier? A. 5% B. 10% C. 25% D. 50% Answer: C. Basic operation...