Course Project: Wastewater Treatment Plant Design

Aiko Sarasvaty Prabowo

Environmental Engineering Program, Islamic University of Indonesia
Supervisor: Dr. Eng. Awaluddin Nurmiyanto, S.T., M.Eng.
Semester: 6th Semester, 2023
Project Type: Individual Final Project

Project Background:

As part of the Wastewater Engineering course, I designed a Wastewater Treatment Plant (WWTP) tailored to the needs of a medium-sized community in Cianjur Regency, West Java. The project aimed to provide a technically sound and environmentally safe wastewater management solution. The design focused on treating domestic wastewater efficiently while complying with national regulations and considering local site conditions.

Based on the SWOT analysis (it can be seen on the report), the wastewater management position of Cianjur Regency falls into Quadrant II, indicating a Selective (Turnaround) Strategy. Although the SPAL (domestic wastewater management system) has significant development opportunities, its current condition remains weak. Therefore, the recommended grand strategy focuses on selective development of off-site centralized systems.

Key priorities included: 

  • Strengthening monitoring and control of on-site systems (individual and communal),

  • Optimizing the use of existing Fecal Sludge Treatment Plants (FSTPs),

  • Improving desludging services through increased fleet and FSTP capacity,

  • Expanding community-based wastewater infrastructure,

  • Gradually developing centralized wastewater systems in priority areas.

Design Methodology:

  1. Population and Flow Estimation

  1. Influent Characterization

  • Projected service population: +450,000 residents

  • Daily water needs (165 L/person/day), wastewater (80%-90% of daily water needs)

  • Calculated average and peak flows for design basis

  • Assumed domestic BOD, COD, TSS, nutrient concentrations

  • Used data to inform unit process selection and expected treatment efficiency

  1. Treatment Process Selection

  1. Design Calculations

  • Sizing of each treatment unit based on 2018 Guidelines for Detailed Engineering Design of Centralized Domestic Wastewater Management Systems  issued by the Ministry of Public Works and Housing. and some books like Metcalf & Eddy 

  • Calculated volumes, hydraulic retention times, surface loading rates, and oxygen requirements

  1. Process Flow Diagram & Layout

  • Developed a PFD and schematic layout of the treatment plant

  1. Sludge Management

  • Estimated sludge generation volume and drying duration

Tools & References Used:

  • Microsoft Excel – Population projection,  flow estimation, unit sizing, and design calculations

  • AutoCAD – Site layout and schematic drawings

  • Permen LHK No. 68 Tahun 2016

  • Guidelines for Detailed Engineering Design of Centralized Domestic Wastewater Management Systems issued by the Ministry of Public Works and Housing & related Indonesian design standards

  • Metcalf & Eddy – Wastewater Engineering, 5th Edition & other books

This project helped me apply wastewater treatment theory to a real world, regional context. I learned how to adapt designs based on site specific factors like topography and land area, while also considering environmental and public health goals. Working independently also strengthened my technical writing and presentation skills.

Report (PDF)
Calculation (Excel)

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