Effluent Quality Trends of a Vocational School WWTP (2021–2024) and Performance of a Mini Water Hyacinth Wetland as a Polishing Unit

Desrita Gevia; Erismar Amri; Nefilinda

doi:10.55927/fjst.v5i2.18

Authors

Desrita Gevia Environmental Studies Program, Universitas UPGRISBA, Padang
Erismar Amri Environmental Studies Program, Universitas UPGRISBA, Padang
Nefilinda Environmental Studies Program, Universitas UPGRISBA, Padang

DOI:

https://doi.org/10.55927/fjst.v5i2.18

Keywords:

Quality Trend, Performance of a Mini Water Hyacinth Wetland

Abstract

This study evaluates whether effluent compliance also implies ecological safety in a vocational-school WWTP in Padang, Indonesia. We analyzed semester effluent data (2021–2024) and an influent–effluent snapshot (October 2025), then tested a mini water hyacinth wetland as a polishing unit (Eichhornia crassipes; 13 L; ~8-day HRT). Variables included pH, BOD, COD, NH3-N, and selected metals. COD and BOD consistently met the national effluent standard, whereas pH showed episodic extremes. Snapshot removal was high for organics (BOD 98.9%; COD 90.4) but moderate for NH3-N (47.1%) under acidic influent. The wetland raised pH and improved Fe/Cu removal yet increased COD and NH3-N, indicating a need for better pH control, nitrification, and polishing design

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