Introduction to Wastewater Basics Exam Bank Solution Manual Already Passed (Rated A+)

Introduction to Wastewater Basics Exam Bank Solution Manual Already Passed (Rated A+) Wastewater Sources (4) - Answers Domestic Industrial Storm Run Off Infiltration & Inflow Why do we treat wastewater? (5) - Answers Disease Causing Organisms Toxic Chemical and Heavy Metals High Nutrient Loading High Dissolved Oxygen Demand Suspended Solids Wastewater Characteristics (6) - Answers Biochemical Oxygen Demand Chemical Oxygen Demand Total Suspended Solids Temperature pH Nutrients Wastewater Treatment Overview (5) - Answers Preliminary Treatment Primary Treatment Secondary Treatment Advanced Treatment or Tertiary Treatment Solids Treatment Operator Responsibilities Overview (7) - Answers Duties System Operation System Maintenance and Repairs Wastewater sampling and Analyses System Administration Emergency Response Obtaining and Maintaining Certification Wastewater Reuse Options (4) - Answers Irrigation Groundwater Recharge Stream Augmentation Industrial Use Wastewater Disposal Overview (2) - Answers Outfall to Surface Water Surface orSubsurface Land Discharge Name 2 types of biomass growth required for biological secondary treatment processes? - Answers Fixed Film Suspended Name 2 types of fixed film (attached growth) systems: - Answers Trickling Filter (TF) Rotating Biological Contactors (RBC) Name 2 Suspended growth systems: - Answers Aerated Lagoons Activated Sludge T or F An RBC requires some type of pretreatment - Answers True What % of the RBC is underwater at a time? - Answers 40% What % range of BOD removal does a Trickling Filter remove? - Answers 50% - 70% BOD removal What is the Trickling Filters biomass refereed to? - Answers Zoogleal Film A low F:M ratio would indicate that there is _____ food per unit of microorganisms? A) More B) Less - Answers B) LESS Stiff white foam on an aeration tank could indicate a high F:M ratio? True False - Answers True If a secondary clarifier has a higher than normal hydraulic loading, a wash out condition may occur? True False - Answers True Secondary Treatment: - Answers further treatment of the effluent from primary treatment to remove more of the residual organics and suspended solids. Secondary treatment BOD removal - Answers 90% or more of TSS and BOD Name 4 types of bacteria found in wastewater: - Answers Cholera Typhoid Salmonella E.Coli Name 3 types of Viruses found in wastewater: - Answers Hepatitis Norwalk Rotavirus Name 2 types of Protoza found in wastewater: - Answers Giardia Cryptosporidium What are two essential nutrients for biological wastewater treatment but, can also cause algae blooms if are excessive? - Answers Nitrogen Phosphorus 4 basic forms of Nitrogen: - Answers 1. Organic Nitrogen 2. Ammonia 3. Nitrite 4. Nitrate Total Nitrogen is the sum of all 4 *40% of the nitrogen in raw wastewater is ammonia* What is Total Kjeldahl Nitrogen (TKN) ? - Answers Total Kjeldahl Nitrogen (TKN) is the sum of only the organic nitrogen and ammonia in the wastewater Name 3 basic forms of phosphorus in wastewater: - Answers 1. Ortho-phosphorus (phosphate) 2. Poly-phosphorus (phosphate) 3. Organic phosphorus (phosphate) Total phosphorus *Ortho-phosphorous is the form most readily used as a nutrient by microorganisms in the treatment process* Warm wastewaters have increased biological activity True False - Answers True The most frequently used method of measuring wastwater strength is: - Answers BOD Primary Treatment: - Answers Sedimentation What % can Primary treatment removal of SS? - Answers 90% - 99% How much BOD can be removed by Primary Treatment? - Answers 20% - 50% BOD removal What % can primary treatment remove of TSS? - Answers 40% - 60% In the activated sludge process, the oxidation may be by chemical or biological process? - Answers True The removal of organisms from the activated sludge treatment process (sludge wasting) is very important control technique. - Answers True In an air distribution system, an air metering device should be located in a straight section of the air main on the suction side of the blower - Answers False - In an air distribution system, an air metering device should be located in a straight section of the air main on the discharge ( NOT SUCTION) side of the blower In an aeration tank, the higher the food to microorganism (F/M) ratio, the more food and therefore a lower dissolved oxygen (DO) is needed. - Answers False - In an aeration tank, the higher the food to microorganism (F/M) ratio, the more food and therefore a higher (NOT LOWER) dissolved oxygen (DO) is needed. When considering a major process change, first review the plant data and then make only one major change at a time - Answers True