The GATE Grind

GATE Water and Wastewater Treatment and Management: Industrial Effluents and Reuse – Previous Year Questions

3 GATE previous year questions on Industrial Effluents and Reuse (Water and Wastewater Treatment and Management, Environmental Science and Engineering) with answers and explanations, from every paper.

  1. GATE 2022 ES Q29 (1 mark, Multiple select) – For molasses-distillery and wood-based pulp/paper effluents, which statements are NOT correct?
  2. GATE 2025 ES Q19 (1 mark, Multiple choice) – In zero liquid discharge, a multiple-effect evaporator is commonly used for
  3. GATE 2025 ES Q58 (2 marks, Numerical answer) – A 2 MLD treatment plant uses RO. TDS rejection is 95%,water recovery70%,and feed TDS8000 ppm. Find reject-stream TDS in g/L, to one decimal.