AP Environmental Science Flashcards: Sewage Treatment

What this deck covers

This deck focuses on Sewage Treatment, giving you a quick way to review the definitions, rules, and examples that matter most for AP Environmental Science.

How to use these flashcards

Work through these flashcards in short sessions. Try to answer each prompt before flipping the card, then revisit any cards you miss until the explanation feels automatic.

Flashcard 1: What process is used to settle solids in primary treatment?

Answer: Sedimentation. Gravity allows solids to settle to the bottom of tanks.

Flashcard 2: Name a common method used in tertiary treatment.

Answer: Filtration, chemical treatment, or UV disinfection. These advanced processes remove remaining contaminants.

Flashcard 3: What is the primary focus of sludge treatment?

Answer: To reduce volume and pathogens in sludge. Stabilization makes sludge safer for disposal or reuse.

Flashcard 4: What is the main objective of tertiary treatment?

Answer: To improve water quality by removing remaining impurities. Final polishing step removes nutrients and pathogens.

Flashcard 5: Which treatment stage typically involves aeration tanks?

Answer: Secondary treatment. Aeration provides oxygen for biological waste breakdown.

Flashcard 6: Identify a common by-product of sewage treatment.

Answer: Biosolids. Treated sludge can be beneficially reused in agriculture.

Flashcard 7: What is removed during the screening process?

Answer: Large debris. Prevents clogging and damage to treatment equipment.

Flashcard 8: Identify a method used for odor control in sewage treatment.

Answer: Carbon filters. Activated carbon absorbs odorous compounds from air.

Flashcard 9: What is the role of activated sludge in sewage treatment?

Answer: To break down organic matter using bacteria. Microbes consume organic waste in aeration tanks.

Flashcard 10: What is the first step in primary sewage treatment?

Answer: Screening. Bars or mesh remove large objects from wastewater.

Flashcard 11: What does a high BOD indicate about water quality?

Answer: High levels of organic pollution. More organic matter requires more oxygen for decomposition.

Flashcard 12: What is removed during the screening process?

Answer: Large debris. Prevents clogging and damage to treatment equipment.

Flashcard 13: What is the purpose of disinfection in sewage treatment?

Answer: To kill pathogens in treated water. Prevents disease transmission from contaminated water.

Flashcard 14: State one advantage of using anaerobic digestion.

Answer: Produces biogas for energy. Methane can be captured and used as renewable fuel.

Flashcard 15: Name a biological process used in secondary treatment.

Answer: Trickling filters or activated sludge. Both use microorganisms to consume organic pollutants.

Flashcard 16: Which nutrient is often removed during tertiary treatment?

Answer: Phosphorus. Prevents eutrophication in receiving water bodies.

Flashcard 17: What is one environmental benefit of using biosolids?

Answer: Can be used as fertilizer. Provides nutrients for crops while recycling waste.

Flashcard 18: What is the purpose of using coagulants in sewage treatment?

Answer: To clump fine particles for easier removal. Chemicals bind small particles into larger, settleable flocs.

Flashcard 19: Which nutrient is often removed during tertiary treatment?

Answer: Phosphorus. Prevents eutrophication in receiving water bodies.

Flashcard 20: What is the first step in primary sewage treatment?

Answer: Screening. Bars or mesh remove large objects from wastewater.

Flashcard 21: Which treatment process uses microorganisms to degrade waste?

Answer: Biological treatment. Living organisms consume and break down pollutants naturally.

Flashcard 22: Identify a common by-product of sewage treatment.

Answer: Biosolids. Treated sludge can be beneficially reused in agriculture.

Flashcard 23: Which gas is commonly produced in anaerobic digesters?

Answer: Methane. Produced when organic matter decomposes without oxygen.

Flashcard 24: Which organisms are utilized in secondary treatment?

Answer: Microorganisms (bacteria and protozoa). These organisms consume organic waste in biological treatment.

Flashcard 25: What is the function of a bar screen in sewage treatment?

Answer: To remove large solid objects. Prevents large items from entering treatment systems.

Flashcard 26: What is the main objective of tertiary treatment?

Answer: To improve water quality by removing remaining impurities. Final polishing step removes nutrients and pathogens.

Flashcard 27: Which type of bacteria performs nitrification in sewage treatment?

Answer: Nitrifying bacteria. Convert ammonia to nitrites then nitrates for removal.

Flashcard 28: What is the role of a clarifier in sewage treatment?

Answer: To separate solids from liquids. Allows settled particles to separate from clean water.

Flashcard 29: Name a common method used in tertiary treatment.

Answer: Filtration, chemical treatment, or UV disinfection. These advanced processes remove remaining contaminants.

Flashcard 30: Identify a common chemical used for disinfection in sewage treatment.

Answer: Chlorine. Strong oxidizing agent that kills bacteria and viruses.

Flashcard 31: What is the purpose of scum removal in sewage treatment?

Answer: To remove floating fats and oils. Grease and oil float and must be skimmed off.

Flashcard 32: What is the purpose of scum removal in sewage treatment?

Answer: To remove floating fats and oils. Grease and oil float and must be skimmed off.

Flashcard 33: What does the term 'effluent' refer to in sewage treatment?

Answer: Treated wastewater. The clean water discharged after treatment processes.

Flashcard 34: What is the purpose of secondary sewage treatment?

Answer: To degrade organic matter using biological processes. Biological processes break down dissolved organic pollutants.

Flashcard 35: Identify the main component of sewage that causes eutrophication.

Answer: Nutrients such as nitrogen and phosphorus. Excess nutrients stimulate algae growth and oxygen depletion.

Flashcard 36: Which process follows coagulation in sewage treatment?

Answer: Flocculation. Gentle mixing forms larger particles from coagulated matter.

Flashcard 37: Identify a key indicator of nutrient pollution in water.

Answer: High nitrate and phosphate levels. These nutrients cause algal blooms and oxygen depletion.

Flashcard 38: What is a disadvantage of using chlorine for disinfection?

Answer: Formation of harmful by-products. Can create toxic chlorinated compounds like trihalomethanes.

Flashcard 39: Identify a common issue with sludge management.

Answer: Odor control. Decomposing organic matter produces unpleasant smells.

Flashcard 40: Which gas is commonly produced in anaerobic digesters?

Answer: Methane. Produced when organic matter decomposes without oxygen.

Flashcard 41: Which organisms are utilized in secondary treatment?

Answer: Microorganisms (bacteria and protozoa). These organisms consume organic waste in biological treatment.

Flashcard 42: What is the main goal of sludge stabilization?

Answer: To reduce pathogens and odors. Biological and chemical processes reduce health risks.

Flashcard 43: What does a high BOD indicate about water quality?

Answer: High levels of organic pollution. More organic matter requires more oxygen for decomposition.

Flashcard 44: Identify a common issue with sludge management.

Answer: Odor control. Decomposing organic matter produces unpleasant smells.

Flashcard 45: Which process follows coagulation in sewage treatment?

Answer: Flocculation. Gentle mixing forms larger particles from coagulated matter.

Flashcard 46: Identify the main goal of primary sewage treatment.

Answer: To remove large solids from wastewater. Physical settling removes debris and suspended particles.

Flashcard 47: Which type of bacteria performs nitrification in sewage treatment?

Answer: Nitrifying bacteria. Convert ammonia to nitrites then nitrates for removal.

Flashcard 48: What is the purpose of grit removal in sewage treatment?

Answer: To remove sand and gravel. Heavy particles can damage equipment and pipes.

Flashcard 49: What is the purpose of disinfection in sewage treatment?

Answer: To kill pathogens in treated water. Prevents disease transmission from contaminated water.

Flashcard 50: What are the primary stages of sewage treatment?

Answer: Primary, secondary, and tertiary treatment. These represent physical, biological, and advanced treatment processes.

Flashcard 51: What is typically measured to assess the effectiveness of disinfection?

Answer: Coliform bacteria levels. Indicates presence of disease-causing microorganisms.

Flashcard 52: Identify the main component of sewage that causes eutrophication.

Answer: Nutrients such as nitrogen and phosphorus. Excess nutrients stimulate algae growth and oxygen depletion.

Flashcard 53: What is the purpose of secondary sewage treatment?

Answer: To degrade organic matter using biological processes. Biological processes break down dissolved organic pollutants.

Flashcard 54: Identify a key indicator of nutrient pollution in water.

Answer: High nitrate and phosphate levels. These nutrients cause algal blooms and oxygen depletion.

Flashcard 55: What is one environmental benefit of using biosolids?

Answer: Can be used as fertilizer. Provides nutrients for crops while recycling waste.

Flashcard 56: What is the function of a bar screen in sewage treatment?

Answer: To remove large solid objects. Prevents large items from entering treatment systems.

Flashcard 57: Which term describes the measure of organic pollution in water?

Answer: Biochemical Oxygen Demand (BOD). Measures oxygen needed to decompose organic matter.

Flashcard 58: What is the purpose of using coagulants in sewage treatment?

Answer: To clump fine particles for easier removal. Chemicals bind small particles into larger, settleable flocs.

Flashcard 59: What is the role of activated sludge in sewage treatment?

Answer: To break down organic matter using bacteria. Microbes consume organic waste in aeration tanks.

Flashcard 60: What does the term 'effluent' refer to in sewage treatment?

Answer: Treated wastewater. The clean water discharged after treatment processes.

Flashcard 61: What is the main goal of sludge stabilization?

Answer: To reduce pathogens and odors. Biological and chemical processes reduce health risks.

Flashcard 62: Which treatment process uses microorganisms to degrade waste?

Answer: Biological treatment. Living organisms consume and break down pollutants naturally.

Flashcard 63: Identify the main goal of primary sewage treatment.

Answer: To remove large solids from wastewater. Physical settling removes debris and suspended particles.

Flashcard 64: Identify a method to remove heavy metals in sewage treatment.

Answer: Chemical precipitation. Chemicals bind metals into particles for settling.

Flashcard 65: State one advantage of using anaerobic digestion.

Answer: Produces biogas for energy. Methane can be captured and used as renewable fuel.

Flashcard 66: Identify a benefit of using UV light for disinfection.

Answer: No chemical residues left in water. No toxic chemical compounds remain after treatment.

Flashcard 67: Which term describes the measure of organic pollution in water?

Answer: Biochemical Oxygen Demand (BOD). Measures oxygen needed to decompose organic matter.

Flashcard 68: What is the role of a clarifier in sewage treatment?

Answer: To separate solids from liquids. Allows settled particles to separate from clean water.

Flashcard 69: What are the primary stages of sewage treatment?

Answer: Primary, secondary, and tertiary treatment. These represent physical, biological, and advanced treatment processes.

Flashcard 70: Identify a method to remove heavy metals in sewage treatment.

Answer: Chemical precipitation. Chemicals bind metals into particles for settling.

Flashcard 71: Identify a common chemical used for disinfection in sewage treatment.

Answer: Chlorine. Strong oxidizing agent that kills bacteria and viruses.

Flashcard 72: Identify a method used for odor control in sewage treatment.

Answer: Carbon filters. Activated carbon absorbs odorous compounds from air.

Flashcard 73: Name a biological process used in secondary treatment.

Answer: Trickling filters or activated sludge. Both use microorganisms to consume organic pollutants.

Flashcard 74: What process is used to settle solids in primary treatment?

Answer: Sedimentation. Gravity allows solids to settle to the bottom of tanks.

Flashcard 75: What is the primary focus of sludge treatment?

Answer: To reduce volume and pathogens in sludge. Stabilization makes sludge safer for disposal or reuse.

Flashcard 76: What is the purpose of grit removal in sewage treatment?

Answer: To remove sand and gravel. Heavy particles can damage equipment and pipes.

Flashcard 77: What is a disadvantage of using chlorine for disinfection?

Answer: Formation of harmful by-products. Can create toxic chlorinated compounds like trihalomethanes.

Flashcard 78: What is typically measured to assess the effectiveness of disinfection?

Answer: Coliform bacteria levels. Indicates presence of disease-causing microorganisms.