GATE CE 2022 Set 1 — Question 26
Go beyond PYQs with Success TrackerAI-powered personalised practice and doubt support. Unlimited practice on eligible plans; AI usage limits apply.MSQ+1 / -0MediumDO, BOD & CODWater QualityEnvironmental EngineeringWastewater CharacteristicsWastewater Quantity & Sewerage
Environmental Engineering → Wastewater Quantity & Sewerage → DO, BOD & COD
Last updated
Question
For wastewater coming from a wood pulping industry, Chemical Oxygen Demand (COD) and 5-day Biochemical Oxygen Demand () were determined. For this wastewater, which of the following statement(s) is/are correct?
Correct answer
(A) COD BOD₅; (B) COD ≠ BOD₅
Solution
Chemical Oxygen Demand (COD) measures the total oxygen required to chemically oxidize both biodegradable and non-biodegradable organic matter. Biochemical Oxygen Demand (BOD) measures only the oxygen required for biological oxidation of biodegradable organic matter by microorganisms.
In almost all cases, . For industrial wastewater like that from a wood pulping industry, there is a significant amount of non-biodegradable organic matter (such as lignin), which makes the COD significantly higher than the . Therefore, is correct, which also implies .
In almost all cases, . For industrial wastewater like that from a wood pulping industry, there is a significant amount of non-biodegradable organic matter (such as lignin), which makes the COD significantly higher than the . Therefore, is correct, which also implies .
Continue learning with Success Tracker
A step still unclear? Work through it with support
Use Success Tracker to ask about the reasoning, then try another GATE CE question to check your understanding.
AI-powered practice· Unlimited practice on eligible plans
- PYQs with solutions
- Attempt available previous-year questions, then compare your reasoning with the worked solution. Coverage varies by stream.
- Practice that adapts
- Choose a topic, work on weaker areas and bookmark questions to revisit. Your attempts feed your progress tracking.
- AI doubt support
- Ask follow-up questions about a step or concept while practising, instead of stopping at the final answer.
Unlimited practice is available on eligible plans. Free practice and AI usage have limits; check the current plan allowances before choosing.
This page stays readable without an account. AI responses can be wrong; check them against the solution and source material.
More questions on Wastewater Quantity & Sewerage
2026 Set 1 Q21A rapid sand filter bed of depth m has % porosity during service cycle. It is…2026 Set 1 Q22The settling velocity of inorganic particles in the sedimentation tank of a water treatment plant…2026 Set 1 Q25Which of the following components is/are NOT removed in the secondary treatment of sewage?2026 Set 2 Q27Column I presents common air pollutants, and column II presents treatment technologies commonly…2026 Set 2 Q28One-third of the solid matter in a sludge containing water is composed of fixed mineral…