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Widha Nugraheni, Putranty
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Energy Engineering Environmental Science Immunology & microbiology Public Health

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Pengolahan Limbah Cair Industri Sablon dengan Metode Elektrokoagulasi Lestari, Dinda Deli; winardi, Winardi; Widha Nugraheni, Putranty
Jurnal Teknologi Lingkungan Lahan Basah Vol 14, No 1 (2026): January 2026
Publisher : Universitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/jtllb.v14i1.95299

Abstract

Wastewater from the screen-printing process contains concentrated dyes and heavy metals, such as hexavalent chromium (Cr⁶⁺), which are hazardous to the environment if discharged untreated. Electrocoagulation is a treatment method that uses an electric current to dissolve a metal electrode, which then reacts to form coagulants within the water. These coagulants bind and precipitate contaminant particles, such as dyes and heavy metal ions. This study aims to (1) determine the efficiency of the electrocoagulation method in reducing color and Cr⁶⁺ parameters; (2) analyze the effect of contact time variation; (3) determine the electrode lifespan; and (4) calculate the estimated energy consumption and cost. The process was conducted using an Iron (Fe) anode and an Aluminum (Al) cathode at a constant voltage of 12 V, with contact times of 30, 45, and 60 minutes. The results showed that the electrocoagulation process was significantly effective (p < .001) in improving wastewater quality. The process successfully reduced color with an efficiency exceeding 99% and Cr⁶⁺ concentration with an efficiency over 92%, while also significantly increasing the solution's pH. Analysis of variance (ANOVA) indicated that variation in contact time had a significant effect on pH (p = 0.024). However, extending the time from 30 to 60 minutes did not show a statistically significant effect on the removal efficiency of color (p = 0.156) or Cr⁶⁺ (p = 0.270), indicating that the null hypothesis (H₀) was accepted for these two parameters. Electrode dissolution efficiency ranged from 64.5% to 75.6%, and the lowest estimated energy cost was obtained at the 30-minute treatment, at IDR 31.36 per liter. This study concludes that electrocoagulation with an Fe anode and Al cathode is highly effective, and a 30-minute process duration is optimal for achieving high pollutant removal efficiencies of 99.43% for color and 99.47% for Cr⁶⁺ cost-effectively. Electrocoagulation has been proven effective and is potentially applicable to small to medium-scale wastewater treatment for screen-printing.
Perencanaan Instalasi Pengolahan Air Limbah (IPAL) Portable Industri Laundry Ramdhani, Ilham; Prio Utomo, Kiki; Widha Nugraheni, Putranty
Jurnal Teknologi Lingkungan Lahan Basah Vol 14, No 1 (2026): January 2026
Publisher : Universitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/jtllb.v14i1.95389

Abstract

Laundry businesses provide significant benefits to the surrounding community's economy and can reduce unemployment and improve the community's standard of living. Based on monitoring data from the Environmental Agency (2018), there are 42 laundries in Pontianak City. One laundry business in Pontianak City without wastewater treatment is Kalesco Laundry. Wastewater from laundry activities is discharged directly into waterways without prior treatment. Laundry liquid waste has a high organic content, which means it can pollute the environment. The purpose of this planning is to design and calculate the budget for building a portable wastewater treatment system at the Kalesco laundry. Sampling was carried out using the grab sample method at 14.00 WIB, and the samples were then tested in the laboratory. The planned waste discharge is 4.15 m3 / day. Based on laboratory test results, the characteristics of the Kalesco laundry liquid waste were: TSS 205 mg/l, COD 1397 mg/l, BOD 608 mg/l, MBAS 3.81 mg/l, phosphate 0.160 mg/l, and pH 8.21. The result of this planning is the selected unit for portable wastewater treatment plant consisting of an equalization tank (0.2x0.1x1.5m), aerobic biofilter tank (1.4mx1.0mx1.5m), sedimentation tank (0.54mx0.27mx2m), and final storage tank (0.4mx0.2mx1.5m) with a total land area required of 2.50 m2 and a total cost of Rp. 4,999,55.
Co-Authors Lestari, Dinda Deli Prio Utomo, Kiki Ramdhani, Ilham Winardi Winardi