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Valorization of Banana Bunch Waste as a Feedstock via Hydrothermal Carbonization for Energy Purposes

Sulaiman Sani Maulana, Nugroho Gunawan, Saputra Hendri Maja, Djaenudin, Permana Dani, Fitria Novi, Putra Herlian Eriska

Journal of Ecological Engineering

2023

Vol. 24, nr 7

61--74

In this article, the potential use of banana bunch waste (BBW) as a source of bioenergy through hydrothermal carbonization (HTC) was investigated. BBW, a byproduct of banana production, is difficult to use as a fuel due to its low density and carbon ratio. However, its high lignocellulose content indicates its potential as a bioenergy source. To determine the optimal HTC conditions, an experiment was conducted using temperature, water to feedstock ratio, and processing time, with the RSM Box-Behnken method used to produce 15 trial formulations. Energy value and mass yield data were collected to determine the optimal values for both. The main parameter affecting energy yield was found to be the water to feedstock ratio, and the optimal conditions were determined to be a temperature of 180 °C, a water to feedstock ratio of 1.5:1, and a processing time of 15 minutes. The highest energy yield of 99.7% was observed under these conditions, while the lowest mass yield of 25.30% was observed at a temperature of 200°C with a water ratio of 2 and a time of 15 minutes. The heating value of the HTC solid product ranges from 17–27 MJ/kg, which is comparable to low-grade sub-bituminous coal, indicating potential for co-firing with coal and other hydrothermal products as a fuel.

Health Risk Assessment of Heavy Metals on Total Suspended Particles in Semi Urban, Urban, and Industrial Areas of Bandung Metropolitan Area, Indonesia

Fitria Novi, Fillaeli Annisa, Jelsih Marcelina, Koesmawati Tiny Agustini, Fitria Laili, Awfa Dion, Qadafi Muammar, Hanami Zarah Arwieny, Suryawan I. Wayan Koko, Prayogo Wisnu, Ikhwali M. Faisi, Nurhalimah Sri Marliah

Ecological Engineering & Environmental Technology

2023

Vol. 24, iss. 5

131--140

Total Suspended Particulates (TSP) in ambient air contain metallic elements and can be inhaled by humans. Inhaled metal elements risk public health with long-term exposure because metallic elements are carcinogenic in the human body. This study aimed to analyze metallic elements and assess their risk to public health in the Bandung area and its surroundings. The metal elements analyzed in this research are Pb, Al, and Mn. Ambient air sampling was carried out in five industrial areas: Bandung Wetan, Buahbatu, Cibeureum, Padalarang, and Cimahi. High Volume Air Sampler (HVAS) is for sampling TSP in ambient air, and X-Ray Fluorescence (XRF) was used to analyze metallic elements. The results of the study showed that the Cimahi location gave the highest TSP level (126.7 g/m3) and the lowest is Padalarang (15.1 μg/m3). The metal elements concentrations, Pb, Al, and Mn were varied widely of 7.1–29.21 ng/m3, 1054.9–1700.1 ng/m3, and 8.91–14.79 ng/m3, respectively. Risk analysis was determined by calculating ADDinhale, Hazard Quotient (HQ), and Hazard Index (HI) to determine whether there is a potential non–carcinogenic effect on public health. Each industrial area gives an HI value > 1.0 and Buahbatu has the highest HI. This study proves that Pb significantly contributes to the increased risk of community exposure to non-carcinogenic effects.