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All Journal Environmental and Toxicology Management (ETM) Journal Of World Science International Journal of Science and Environment

Voijant Tangahu, Bieby

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Author-ID : 2103610

Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Economics, Econometrics & Finance Engineering Environmental Science Health Professions Law, Crime, Criminology & Criminal Justice Mathematics Physics Public Health Social Sciences

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Articles

Green engineering principles and application: bioremediation Hadibarata, Tony; Voijant Tangahu, Bieby
Environmental and Toxicology Management Vol. 1 No. 3 (2021): Green engineering principles and application
Publisher : Universitas Nahdlatul Ulama Surabaya

The adulteration of the environment by hazardous waste, such as heavy metals, nuclear wastes, hydrocarbons, pesticides and greenhouse gases is the major serious problem which need to be reduced. Common remediation technique such as physical, chemical and biological process are being applied. Chemical process can transform and change organic contaminant of interest which is not sufficient to clean the environment, while physical technique requires additional equipment. Thus, bioremediation exist as green approach to eliminate the hazardous waste in the environment. In this review, bioremediation is comprehensively presented. Remediation process types, challenges, limitations, mechanisms, and future suggestion has been elaborated to develop bioremediation technology for future prospect.

Green technology of natural fiber reinforced bio-composites as alternative sustainable product Hadibarata, Tony; Umarie, Winda; Voijant Tangahu, Bieby; Ramadhany, Putri; Ananda Putra, Gilang
Environmental and Toxicology Management Vol. 2 No. 2 (2022): Environmental flows and natural resources management
Publisher : Universitas Nahdlatul Ulama Surabaya

Proactive strategies are being opted by metallurgical, foundry and manufacturing industries with respect to their experiences working with product designing based on product life cycle assessments. Without the consideration of the potential impacts on the life cycle, the development of new products would barely be sustainable. “Green” composites or bio-composites are fully degradable composites mainly consisting of a blend of biopolymer matrix and natural fibers which act as a reinforcing phase. In this study, natural bio-composite was reviewed as an alternative sustainable product. The types of natural fibers were also described as raw material of natural bio-composite. In addition, development natural fibers nowadays were mentioned. Furthermore, the application of natural fiber reinforced bio-composites was also presented.

Literature Study Of The Ability Of Fragrant Roots (Vetiveria zizanioides) And Sunflowers (Helianthus Annuus) On Phytoremediation Of Lead-Tainted Soil (Pb) Yoga, Alif; Voijant Tangahu, Bieby
Journal of World Science Vol. 1 No. 2 (2022): Journal of World Science
Publisher : Riviera Publishing

Lead pollution is a serious problem because of its wide distribution as a result of residential, agricultural, and industrial activities. Lead is a heavy metal that can cause various health problems due to its high toxicity. The high level of lead pollution needs to be overcome to reduce the impact of the risk of lead toxicity, one of which is phytoremediation. The ability of vetiver and sunflower in the phytoremediation process of lead has been reported by various literature. 40 kinds of literature were used as data sources. A literature review by making identification and classification based on the variables and parameters that will be reviewed from several articles that discuss the same topic using a synthetic matrix. Both plants have hyperaccumulator properties in absorbing heavy metals. The highest accumulation of Pb was in the roots up to 5500 mg kg-1, while sunflowers accumulated Pb up to 1450 mg kg-1. The accumulation of Pb was influenced by soil type, nutrient abundance, rhizobacteria, and chelating agents. The toxicity of highly contaminated metals did not significantly affect the growth of vetiver but only slightly decreased parameters. Sunflower response to stress caused by Pb varies depending on variety, soil type, metal type, dose, and duration of metal exposure

Effectiveness of Constructed Wetland with a Variety of Plants in Processing Nickel Mining Waste Lionie, Lionie; Voijant Tangahu, Bieby; Kasmon, Umar
International Journal of Science and Environment (IJSE) Vol. 6 No. 1 (2026): February 2026
Publisher : CV. Inara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51601/ijse.v6i1.300

This study evaluates a pilot-scale constructed wetland for treating nickel mine wastewater from Watulabu Pond using combinations of Phragmites australis, Typha latifolia, and Chrysopogon zizanioides grown on topsoil and nickel slag–amended substrates. A mixed quantitative–qualitative approach was applied to assess technical performance (removal of TSS, Ni, and Cr⁶⁺), economic feasibility (operational costs relative to chemical treatment), and alignment with Indonesian environmental regulations for the nickel mining sector. All three macrophytes acclimatized well to nickel‑rich wastewater, but vetiver grass showed the strongest physiological response, with the highest plant height growth rate (1.00 cm/day) and vigorous tiller formation during 14 days of operation. Initial Cr⁶⁺ and total Cr concentrations of 1.73 mg/L and 1.99 mg/L (approximately 17× and 4× above national standards) were substantially reduced, with vetiver lowering Cr⁶⁺ and total Cr to 0.07 mg/L and 0.18 mg/L, respectively, both below discharge limits. TSS decreased from 350 mg/L to as low as 4.5–8.0 mg/L in topsoil‑based systems, corresponding to removal efficiencies up to 98.31%, while Fe and Ni removals consistently exceeded 90% in vegetated reactors. Vetiver achieved the highest metal removal efficiencies (Cr⁶⁺ 96.19%, total Cr 90.98%, total Fe 95.84%, total Ni 96.02%) and the greatest removal rates (0.111 mg/L/day for Cr⁶⁺ and 0.121 mg/L/day for total Cr), supported by very high Bioconcentration Factor values for total Cr (7,272.87) and Cr⁶⁺ (134.37), indicating exceptional root accumulation. In contrast, nickel slag–amended media showed lower accumulation capacity and, in some cases, negative removal for Cr species, suggesting chromium leaching and confirming pure topsoil as the more suitable substrate. Operational cost analysis revealed that the constructed wetland reduced treatment costs from IDR 2,300 to IDR 750 per m³ (≈67% savings) compared with manual chemical dosing, while producing effluents that meet national standards for TSS, Ni, and Cr in the best configurations. Overall, the findings demonstrate that appropriately designed constructed wetlands—particularly those using vetiver on topsoil—can simultaneously achieve high removal of Cr⁶⁺, Ni, Fe, and TSS, lower operating costs, and improve regulatory compliance, offering a technically robust and economically attractive option for sustainable nickel mine wastewater management in Indonesia.

Co-Authors Ananda Putra, Gilang Kasmon, Umar Lionie, Lionie Ramadhany, Putri Tony Hadibarata, Tony Umarie, Winda Yoga, Alif

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