Chayanon Nont Sawatdeenarunat

University of Hawaii at Hilo | UHH · College of Agriculture, Forestry and Natural Resource Management

The purpose of this research was to develop an integrated biorefinery process of solid-state anaerobic digestion (SS-AD) and hydrothermal carbonization (HTC) for the co-production of methane and hydrochar using elephant dung (ED) as substrate. With a leachate recirculation rate of 4 times/day, the SS-AD presented the highest cumulative methane yiel...

The purpose of this research was to develop an integrated biorefinery process of solid-state anaerobic digestion (SS-AD) and hydrothermal carbonization (HTC) for the co-production of methane and hydrochar using elephant dung (ED) as substrate. With a leachate recirculation rate of 4 times/day, the SS-AD presented the highest cumulative methane yiel...

Polyhydroxyalcanoates (PHAs) are promising biodegradable plastics that can replace conventional petroleum-based plastics and mitigate oceanic pollution. High organic wastewater has been examined as a potential substrate for lowering the manufacturing cost of PHAs. In this study, the three main indicators, including net present value (NPV), internal...

This study investigated the combined hydrothermal carbonization and anaerobic digestion process using cow manure and rubberwood waste. Increasing the temperature from 190 to 240 °C improved the fuel properties of rubberwood waste, including energy content, ash content, and thermal stability, surpassing those of cow manure. The subsequent anaerobic...

Effluent from biogas plants can contribute to serious environmental issues due to its high organic compound content and its dark color. This study utilizes Pseudomonas putida strains isolated from activated sludge in a wastewater treatment plant to reduce the organic compound content and dark color of biogas plant effluent. The treatment of effluen...

Today, about 4.8–12.7 million tons of fossil-based plastics have reached the oceans. Thus, this pollution has become a matter of significant concern globally. Polyhydroxyalcanoates (PHAs) are one of the promising biodegradable plastics that could replace conventional petroleum-based plastics and subsequently mitigate oceanic pollution. High organic...

This research aims to determine an appropriate elephant-camp derived waste management by converting to heat energy. Two waste conversion processes were categorized in this study: (1) directly converted fresh elephant dungs (FD) to heat energy and (2) anaerobically digested FD to biogas and subsequently, converted digestate (DT) to heat energy. Init...

The synthesis of polyhydroxyalkanoates (PHA) using mixed microbial cultures (MMC) has been studied in three stages: a sequencing batch reactor, a PHA accumulation reactor, and a pyruvate effect. Tainan pig farm, Chiayi pig farm, and Feng Chia University’s sludge were the three seed sludges tested. Two distinct substrates are used, such as effluent...

Anaerobic digestion (AD) of elephant camp–derived wastes was studied using series of batch experiments. Three different materials derived from elephant dung namely fresh elephant dung (FD), washing water (WW), and washed fiber (WF) served as the substrates. The theoretical methane potentials of the solid substrates were 786.0 and 580.6 LCH4/gVSadde...

The World's Largest International conference on Biomass Poster presentation

Napier grass (Pennisetum purpureum) is a high yield tropical grass with great potential for anaerobic digestion. Two-phase anaerobic dry digestion (TADD), considered an alternative for anaerobic wet digestion system (AWD) with only front-end leach bed reactor (LBR), is added to existing liquid digester, was tested under different leachate circulati...

This study aims to characterize the combustion of the biomass stove filled with a porous medium for air pre-heating to enhance the biomass decomposition. An equivalence ratio, one of the important parameters for the combustion, was investigated to evaluate the completeness of the combustion process. Thermal efficiency was used as the indicator to r...

Anaerobic digestion (AD) of lignocellulosic biomass has received significant attention for bioenergy production in recent years. However, hydrolysis is a rate-limiting in AD of such feedstock. In this study, effects of hydrothermal pretreatment of Napier grass, a model lignocellulosic biomass, on methane yield were examined through series of batch...

Sweet corn wastes (i.e. corn cobs, corn husks, and corn seeds) are an appropriate substrate for anaerobic digestion to produce gaseous biofuels such as biogas. In this study, the pilot-scale dry anaerobic digestion was performed in batch mode. Corn cobs, corn husks and corn seeds were chopped with an agricultural cutting machine to approximately 5-...

Anaerobic digestion (AD) has gained significant attention in recent years. In addition to producing renewable energy and bio-based chemicals from diverse organic feedstock, AD process also remediates organic waste streams along with curtailing greenhouse gas (GHG) emission. Operational conditions and anaerobic reactor configurations are continuousl...

Anaerobic digestion (AD) of lignocellulosic biomass i.e. Napier grass (Pennisetum purpureum), was investigated via a series of batch and bench-scale experiments. Two semi-continuous bench-scale horizontal bioreactors were operated in parallel for nearly 300 days, and the reactors were able to handle the organic loading rate (OLR) up to 6 kg volatil...

A series of batch experiments were conducted to investigate the effects of inoculum type, oxygen (O2) dosage, and incubation time on volatile fatty acids (VFAs) production during anaerobic digestion (AD) of Napier grass (Pennisetum purpureum), a high yielding energy crop. The results showed that anaerobically digested cattle manure (ADCM) as an ino...

Anaerobic Digestion (AD) has been in use for many decades. To date, it has been primarily aimed at treating organic wastes, mainly manures and wastewater sludge, and industrial wastewaters. However, with the current advancements, a more open mind is required to look beyond these somewhat restricted original applications of AD. Biorefineries are suc...

Population growth and increasing affluence worldwide have resulted in a significant increase in energy and material consumption as well as waste generation. Currently, the main source of energy and materials is petroleum, which has serious implications for energy security and the environment (e.g., climate change). The efficient conversion of abund...

Carboxylic acids produced by acid fermentation have attracted much attention recently as promising chemical feedstock. The feasibility of the acid fermentation as a high-value added bioconversion process depends on the selective separation of carboxylic acids from the bulk solution. The authors synthesized an aminopropyl-functionalized mesoporous s...

Innovative waste biomass derived organic acids synthesis, immobilization, and purification system