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Innovation of Remazol yellow FG dye adsorption using biochar from coffee fruit shell waste

Sukarta I Nyoman, Suyasa I Wayan Budiarsa, Mahardika I Gede, Suprihatin Iryanti Eka, Sastrawidana I Dewa Ketut

Journal of Ecological Engineering

2025

Vol. 26, nr 1

273--285

The textile industry produces liquid waste containing synthetic dyes, such as Remazol yellow FG, which are difficult to decompose naturally and negatively impact the environment. This study aims to evaluate the effectiveness of biochar derived from coffee fruit shell waste as an adsorbent for removing Remazol yellow FG dye from aqueous solutions. The method used includes pyrolyzing coffee fruit shell at 300 °C for 120 minutes to produce biochar, which is then tested for its dye adsorption capacity through batch experiments with varying dye concentration, pH levels, and contact time. The results showed that coffee fruit shell biochar had a high adsorption capacity at pH 4 and a contact time of 80 minutes. The process of adsorption followed the Langmuir isotherm model with a value r2 of 0.91507 for non-active biochar adsorbent and 0.92372 for biochar that had been activated with NaOH. Adsorption kinetics followed second-order kinetics with r2 reaching 0.96189 for non-active biochar and 0.96697 for biochar activated with NaOH. The effectiveness of biochar under laboratory conditions highlights its potential as a more economical and environmentally friendly adsorbent compared to commercial activated carbon. This research contributes to the development of liquid waste treatment technologies based on renewable materials, supporting the circular economy in the textile industry.

Development of Heavy Metals Bioaccumulation on Anaerobic Support System with Sulfate Reducing Bacteria Media

Suyasa I Wayan Budiarsa, Sukarta I Nyoman, Suprihatin Iryanti Eka

Journal of Ecological Engineering

2024

Vol. 25, nr 7

295--304

Heavy metals in wastewater come from processes related to heavy metals as raw materials and contaminants. Heavy metals pose a significant threat. Bioaugmentation technique that utilizes communities of microorganisms to bioaccumulation heavy metals from wastewater. However, the application of SRB in anaerobic system installations for wastewater treatment needs to continue to be developed with more practical applications. In this study, the enriched SRB colony source was applied to an anaerobic tank. The grown SRB is used to extract heavy metals from wastewater with the addition of sulfate and supporting nutrients. Throughout the treatment process, the anaerobic system with SRB consistently maintained a sulfate removal efficiency of 87–88%, indicating continued sulfate consumption activity by the SRB colony. Despite the high initial concentration of heavy metals, the system effectively removed>91% of Pb, Cd, Zn, and Cr on days 15, 30, and 45. Additionally, the system reduced the Cu content by 43.6%, thereby reaching peak metal removal heavy. the level was 85% on day 30 and decreased slightly to 83% on day 45. This study bridges the gap in understanding the application of SRB in wastewater treatment systems with effective performance.