Success TrackerSuccess Tracker
Log inSign up

GATE CE 2025 Set 2 — Question 62

Go beyond PYQs with Success TrackerAI-powered personalised practice and doubt support. Unlimited practice on eligible plans; AI usage limits apply.
NAT+2 / -0MediumASP Design (F/M, MLSS, SVI)Wastewater Treatment ProcessesEnvironmental Engineering

Environmental Engineering → Wastewater Treatment Processes → ASP Design (F/M, MLSS, SVI)

Last updated

Question

A community generates 1 million litres/day (MLD) of wastewater. This wastewater is treated using activated sludge process (ASP). The working volume of the aeration tank of the ASP is 250 m3250\text{ m}^3, and the biomass concentration in the tank is 3000 mg/L3000\text{ mg/L}. Analyses results showed that a biomass concentration of 10 mg/L10\text{ mg/L} is present in the treated effluent from the secondary sedimentation tank of the ASP. Sludge wastage from the system is at a rate of 5000 L/day5000\text{ L/day} with a biomass concentration of 10000 mg/L10000\text{ mg/L}. The system is in steady state condition.
The biological sludge residence time (BSRT) of the system (in days) is______ (round off to one decimal place).
Your answer

Enter a number. Decimals, negative values and scientific notation are accepted.

The solution stays hidden until you check.

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.

Start with a free accountView plans and allowances

This page stays readable without an account. AI responses can be wrong; check them against the solution and source material.

More questions on Wastewater Treatment Processes

2026 Set 1 Q21A rapid sand filter bed of depth 0.80.8 m has 4040 % 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 90%90\% water is composed of fixed mineral…