Enhanced biogas yield in anaerobic digestion of citric acid wastewater by pre-treatment: The effect of calcium hydroxide precipitation and electrocoagulation process

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dc.authoridBelibagli, Pinar/0000-0001-6643-9620
dc.authoridN, Senthilkumar/0000-0002-2441-1061
dc.authoridGULSEN AKBAY, Habibe Elif/0000-0003-1144-9279
dc.contributor.authorBelibagli, Pinar
dc.contributor.authorAkbay, Habibe Elif Gulsen
dc.contributor.authorArslan, Salih
dc.contributor.authorMazmanci, Birgul
dc.contributor.authorDizge, Nadir
dc.contributor.authorSenthilkumar, Natarajan
dc.contributor.authorBalakrishnan, Deepanraj
dc.date.accessioned2025-03-17T12:25:57Z
dc.date.available2025-03-17T12:25:57Z
dc.date.issued2024
dc.departmentTarsus Üniversitesi
dc.description.abstractDuring the production and use of citric acid (CA), which is frequently used in food, chemistry, metallurgy and other related industries, wastewater with high organic load and acidity is generated. Discharge of these wastewaters into the receiving environment without adequate purification causes serious pollution problems. However, treating such wastewater with hybrid processes allows both the formation of valuable by-products and an increase in the degree of purification. In this study, the biogas production potential of citric acid wastewater (CAWW), which was pre-treated by chemical precipitation and electrocoagulation (EC) processes, was investigated. Pre-treatment experiments were designed using Box-Behnken Design (BBD) and chemical oxygen demand (COD) concentrations after hydrated lime (Ca(OH)2) precipitation and EC processes were determined as 4960 mg/L and 5120 mg/L, respectively. The pre-treated CAWW were finally used for the secondary treatment by anaerobic digestion (AD) process. After AD process COD degradation determined as 67% and 98% for Ca (OH)2 precipitation and EC process, respectively. In addition, the biogas production of the pre-treated CAWW increased approximately 2 and 7 times for the Ca(OH)2 precipitation and EC processes, respectively, compared to the untreated. The methane (CH4) content of the produced biogas increased by 18% and 50% for Ca(OH)2 precipitation and EC processes, respectively. According to 48-hour acute toxic test result, daphnia mortality decreased from 50% concentration of CAWW after AD, even 10% concentration is non-toxic to daphnia. In conclusion, the complementarity of Ca(OH)2 precipitation and EC processes with AD promoted both the removal of organics from wastewater and the production of valuable by-products.
dc.identifier.doi10.1016/j.psep.2024.02.050
dc.identifier.endpage1356
dc.identifier.issn0957-5820
dc.identifier.issn1744-3598
dc.identifier.scopus2-s2.0-85186526537
dc.identifier.scopusqualityQ1
dc.identifier.startpage1344
dc.identifier.urihttps://doi.org/10.1016/j.psep.2024.02.050
dc.identifier.urihttps://hdl.handle.net/20.500.13099/1964
dc.identifier.volume184
dc.identifier.wosWOS:001207894600001
dc.identifier.wosqualityQ1
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherElsevier
dc.relation.ispartofProcess Safety and Environmental Protection
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.snmzKA_WOS_20250316
dc.subjectCitric acid wastewater
dc.subjectChemical precipitation pre-treatment
dc.subjectElectrocoagulation pre-treatment
dc.subjectWastewater treatment
dc.subjectAnaerobic digestion
dc.subjectWaste recycling
dc.titleEnhanced biogas yield in anaerobic digestion of citric acid wastewater by pre-treatment: The effect of calcium hydroxide precipitation and electrocoagulation process
dc.typeArticle

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