NivaarExam PrepOfficial exam papers ↗

18-Env-B5 Industrial & Hazardous Waste Management · December 2014

Question 16 of 20: Wastewater Management Strategy for a New Industry

Nivaar worked solution (AI-drafted; not reviewed by a licensed engineer)

Notes on this paper

Reference texts: Nemerow & Dasgupta, Industrial and Hazardous Waste Treatment, 2nd ed.; Metcalf & Eddy, Wastewater Engineering: Treatment and Resource Recovery, 5th ed.; Davis & Cornwell, Introduction to Environmental Engineering, 6th ed.; LaGrega, Buckingham & Evans, Hazardous Waste Management, 2nd ed.; CCME, Guidelines for the Management of Biomedical Waste in Canada (1992); Canadian Environmental Protection Act (CEPA), 1999; provincial Environmental Protection / Hazardous Waste Regulations (e.g. BC's Hazardous Waste Regulation, O.Reg. 347 in Ontario); Montgomery & Runger, Applied Statistics and Probability for Engineers (for Q1–Q5's basic-statistics content).

Question 16: Wastewater Management Strategy for a New Industry (15 marks)

Question text not reproduced: the examination questions are © Engineers and Geoscientists BC. Open the official past paper (linked at the top of this page) to read the question, then follow the worked solution below.

16.1 Steps for the assignment. The assignment proceeds through six broad stages. (1) Scope and information gathering — meet the client to understand the process, production schedule, and expected waste-generating operations, and review process flow diagrams and any comparable-facility data. (2) Characterize the anticipated wastewater — either from pilot-plant/bench data (for a genuinely new process) or from published/comparable-industry unit-loading factors (kg BOD or SS per unit product, as in Question 19), since no on-site survey is possible before the plant exists. (3) Identify applicable regulatory requirements — the municipal sewer-use bylaw (if discharging to a municipal system), or the provincial direct-discharge permit requirements (if discharging to a receiving watercourse), including any pretreatment standards. (4) Evaluate treatment/discharge alternatives — direct discharge to the municipal system (with or without pretreatment), on-site treatment with discharge to a receiving water, or a combination, comparing each against the regulatory requirement, capital and operating cost, and reliability. (5) Develop a preferred, cost-effective strategy — select and preliminarily size the recommended treatment train, including a capital and O&M cost estimate. (6) Report the findings and recommendation to the client in a structured engineering report.

16.2 & 16.3 Report index, with one sentence per heading.

  1. 1.0 Executive Summary. Summarizes the recommended wastewater management strategy, its estimated cost, and the regulatory basis, for a reader who will not read the full report.
  2. 2.0 Introduction and Project Background. Describes the client's proposed facility, its production process, and the purpose and scope of this assignment.
  3. 3.0 Regulatory Framework. Identifies the applicable municipal sewer-use bylaw and/or provincial discharge-permit requirements and the specific limits the wastewater strategy must meet.
  4. 4.0 Wastewater Characterization. Presents the estimated flow, strength (BOD/COD/TSS/pH/nutrients) and any process-specific constituents expected from the proposed operation, with the basis for each estimate.
  5. 5.0 Alternatives Evaluation. Compares the feasible treatment/discharge alternatives (municipal discharge with/without pretreatment, on-site treatment, or combination) against cost, reliability and regulatory compliance.
  6. 6.0 Recommended Strategy and Preliminary Design. Describes the selected treatment train, its preliminary sizing basis, and how it meets every applicable limit.
  7. 7.0 Cost Estimate. Presents the capital and annual operating and maintenance cost for the recommended strategy.
  8. 8.0 Implementation Schedule. Outlines the permitting, design, construction and commissioning timeline required before the facility can begin operation.
  9. 9.0 Conclusions and Recommendations. States the final recommendation and any conditions or further studies needed before proceeding.