WATER TREATMENT OIT TEST 300 HIGH-YIELD WATER CHEMISTRY, FILTRATION, DISINFECTION, AND REGULATORY COMPLIANCE SUMMARY 2026

WATER TREATMENT OIT TEST 300 HIGH-YIELD
WATER CHEMISTRY, FILTRATION, DISINFECTION,
AND REGULATORY COMPLIANCE SUMMARY
2026

◉ Scum is usually removed in the ___ treatment stage.
Answer: primary


◉ When domestic wastewater enters natural waters, what species
deplete most of the oxygen?
Answer: aerobic bacteria


◉ Once the oxygen is depleted in a naturally body of water, which
organisms take over?
Answer: anaerobic bacteria


◉ The major gas produced by anaerobic decomposition is
Answer: methane


◉ Another name for primary treatment is:
Answer: sedimentation

, ◉ Digester gas is ___ when mixed with air in the proper proportions.
Answer: extremely explosive


◉ A pond that is used to treat raw wastewater is called:
Answer: a waste stabilization pond


◉ A pond that has an aerobic top layer and an anaerobic bottom
layer is called:
Answer: a faculative pond


◉ What is the angle of the bars on a manually cleaned bar screen?
Answer: 30 degrees


◉ What is the angle of the bars on a mechanically cleaned bar
screen?
Answer: 45 to 60 degrees


◉ what is the ideal wastewater velocity in feet per second through
screen channel?
Answer: 1.5ft/sec