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Processing of Tofu industrial wastewater by electrocoagulation method using aluminum (Al) electrode at various electrical current and contact time

Indonesian Journal of Chemical Science · Vol. 14 No. 1 (2025) · pp. 85–97

DOI
10.15294/ijcs.v14i1.18787
ISSN
2502-6844, 2252-6951
Published
2025-05-05
Publisher
Prodi Kimia
Language
eng

Abstract

This research aims to determine the effect of varying voltage and contact time on reducing levels on Chemical Oxygen Demand (COD), Total Suspended Solids (TSS), Total Dissolved Solids (TDS) and ammonia as well as increasing pH values ​​in tofu industrial wastewater by electrocoagulation using Aluminum electrodes. There were 4 variations of voltage (10,20,30,4 0A) and 5 variations of contact time (30,60,90,120,150 minutes). Analysis of COD levels and ammonia levels was carried out using a UV-Vis spectrophotometer, analysis of TSS levels gravimetrically using Whatman filter paper No. 42, analysis of TDS levels with gravimetrically, and analysis of pH values ​​by a pH meter. The best results were obtained from treatment at voltage of 40 A and a contact time of 150 minutes with the highest efficiency of reducing COD, TSS, TDS, ammonia levels respectively at 90.35; 92; 66; 85% and the highest increase in pH value was 108%. The results of the diversity analysis or Tukey's advanced test showed that at the 5% level each treatment had a significant effect on reducing COD, TSS, TDS and ammonia levels as well as increasing the pH value. Chemical kinetics analysis of the reduction in COD and TSS levels showed results that were close to first orde linear and obtained R2 and k values ​​respectively of (0.9904; 0.0164); (0.9952; 0.0182) at voltage variation of 40 A

Collaboration network of the authors

24 authors · 66 co-authorship links

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Co-authorOrganisationJoint articles
Poedji Loekitowati HarianiAffiliation unknown3
Hasanudin HasanudinAffiliation unknown2
Fahma RiyantiAffiliation unknown2
Widia PurwaningrumAffiliation unknown2
Syahdar BabaAffiliation unknown1
Asmuddin NatsirAffiliation unknown1
Izdin IdrusAffiliation unknown1
La Ode BasriAffiliation unknown1
Aswati AswatiAffiliation unknown1
Faika BurhanAffiliation unknown1
Aslim AslimAffiliation unknown1
Muhammad SaidAffiliation unknown1
Salni SalniAffiliation unknown1
Nabila ApriantiAffiliation unknown1
Anisa Fitri AmatullahAffiliation unknown1
Aldes LesbaniAffiliation unknown1
Risfidian MohadiAffiliation unknown1
Tarmizi TaherAffiliation unknown1
Neza Rahayu PalapaAffiliation unknown1
Bakri Rio RahayuAffiliation unknown1

Affiliations come from OpenAlex; journal OAI-PMH metadata carries none. Authors without an OpenAlex ID are matched by name, which can merge or split people.

Metadata source: OAI-PMH (metadata jurnal) https://journal.unnes.ac.id/journals/ijcs/oai, first harvested 5 Nov 2026, last seen 8 Nov 2026.
Original metadata (oai_dc) 
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	<dc:title xml:lang="en">Processing of Tofu industrial wastewater by electrocoagulation method using aluminum (Al) electrode at various electrical current and contact time</dc:title>
	<dc:creator xml:lang="en">Rachmat, Addy</dc:creator>
	<dc:creator xml:lang="en">Fatma, Fatma</dc:creator>
	<dc:creator xml:lang="en">Pratama, Nisa Manora</dc:creator>
	<dc:creator xml:lang="en">Musifa, Eva</dc:creator>
	<dc:description xml:lang="en">This research aims to determine the effect of varying voltage and contact time on reducing levels on Chemical Oxygen Demand (COD), Total Suspended Solids (TSS), Total Dissolved Solids (TDS) and ammonia as well as increasing pH values ​​in tofu industrial wastewater by electrocoagulation using Aluminum electrodes. There were 4 variations of voltage (10,20,30,4 0A) and 5 variations of contact time (30,60,90,120,150 minutes). Analysis of COD levels and ammonia levels was carried out using a UV-Vis spectrophotometer, analysis of TSS levels gravimetrically using Whatman filter paper No. 42, analysis of TDS levels with gravimetrically, and analysis of pH values ​​by a pH meter. The best results were obtained from treatment at voltage of 40 A and a contact time of 150 minutes with the highest efficiency of reducing COD, TSS, TDS, ammonia levels respectively at 90.35; 92; 66; 85% and the highest increase in pH value was 108%. The results of the diversity analysis or Tukey's advanced test showed that at the 5% level each treatment had a significant effect on reducing COD, TSS, TDS and ammonia levels as well as increasing the pH value. Chemical kinetics analysis of the reduction in COD and TSS levels showed results that were close to first orde linear and obtained R2 and k values ​​respectively of (0.9904; 0.0164); (0.9952; 0.0182) at voltage variation of 40 A</dc:description>
	<dc:publisher xml:lang="en">Prodi Kimia</dc:publisher>
	<dc:date>2025-05-05</dc:date>
	<dc:type>info:eu-repo/semantics/article</dc:type>
	<dc:type>info:eu-repo/semantics/publishedVersion</dc:type>
	<dc:type xml:lang="en">Peer-reviewed Article</dc:type>
	<dc:format>application/pdf</dc:format>
	<dc:identifier>https://journal.unnes.ac.id/journals/ijcs/article/view/18787</dc:identifier>
	<dc:identifier>10.15294/ijcs.v14i1.18787</dc:identifier>
	<dc:source xml:lang="en">Indonesian Journal of Chemical Science; Vol. 14 No. 1 (2025): Indonesian Journal of Chemical Science; 85-97</dc:source>
	<dc:source>2502-6844</dc:source>
	<dc:source>2252-6951</dc:source>
	<dc:language>eng</dc:language>
	<dc:relation>https://journal.unnes.ac.id/journals/ijcs/article/view/18787/3751</dc:relation>
	<dc:rights xml:lang="en">Copyright (c) 2025 Indonesian Journal of Chemical Science</dc:rights>
</oai_dc:dc>