KMITL

Permanent URI for this communityhttps://dspace.kmitl.ac.th/handle/kmitl/1

Browse

Search Results

Now showing 1 - 6 of 6

Some of the metrics are blocked by your
consent settings
Optimization of chemical precipitation for valuable metal recovery from spent lithium nickel manganese cobalt oxide batteries
(2026-05-01)
Morawan, Nattaya
;
Kruthun, Orathai
;
Katers, John F.
;
Attaphong, Chodchanok
This study investigated the optimized conditions for chemical precipitation to recover nickel manganese cobalt hydroxide (NiCoMn-OH) and lithium carbonate (Li<inf>2</inf>CO<inf>3</inf>) from spent lithium nickel manganese cobalt oxide (sLi-NMC) batteries. The research focused on establishing optimized conditions to maximize recovery efficiency and product purity. The process involved dismantling and incinerating the batteries to produce black powder, followed by acid leaching using H<inf>2</inf>SO<inf>4</inf> and H<inf>2</inf>O<inf>2</inf>, and a two-step precipitation to recover NiCoMn-OH and Li<inf>2</inf>CO<inf>3</inf>. Results indicated that the optimized incineration conditions for efficient black powder production were 600 °C for 30 min. During the leaching process, the optimized extraction of lithium, nickel, cobalt, and manganese was achieved using 1 M H<inf>2</inf>SO<inf>4</inf> with 2% H<inf>2</inf>O<inf>2</inf> at a liquid-to-solid ratio of 30:1 mL/g. In the first precipitation stage, the optimized conditions for co-precipitating the solid NiCoMn-OH using saturated NaOH were identified as pH 10, 25 °C, and a contact time of 90 min. The results showed that nickel, manganese, and cobalt were precipitated at 92.04%, 90.35%, and 86.78%, respectively (a purity of 98.67%). Finally, lithium was successfully recovered as Li<inf>2</inf>CO<inf>3</inf> using saturated Na<inf>2</inf>CO<inf>3</inf>, at pH 12, 100 °C, and a contact time of 120 min up to 96.51% (a purity of 98.98%). Ultimately, the optimized conditions obtained from this study can provide valuable data for waste management and serve as a comparative baseline for environmental impact assessment of conventional metal recovery, enabling direct comparisons with optimized alternative methods in future research.
1
Some of the metrics are blocked by your
consent settings
Insights from dual-platform metabolomics on durian flowers: An alternative source of procyanidins from agricultural waste with bioactivities
(2025-07-01)
Potijun, Supakorn
;
Pattarapipatkul, Nattaya
;
Boonma, Pitchakorn
;
Pewlong, Putthamas
;
Pathtubtim, Intira
Procyanidins, which are polyphenol compounds in grape seeds, apples, and berries, are known for their anti-inflammatory and antioxidant properties. In this study, we investigated durian flowers, an agricultural waste, as a novel procyanidin source. Durian trees bloom prolifically, but not all flowers develop into mature fruits, representing underutilized resources. Dual-platform metabolomic analysis using ultra-high-performance liquid chromatography with electrospray ionization quadrupole time-of-flight mass spectrometry and gas chromatography–mass spectrometry annotates polyphenols such as (−)-epicatechin, procyanidins B1, B2, and C1. The 80 % (v/v) ethanol extraction yielded a crude extract with a total procyanidin content of 7.68 mg/g. Bioactivity assays revealed that the procyanidin-rich crude extract reduced oxidative stress and exhibited anti-inflammatory effects against UVA in human keratinocytes (HaCaT). This study is the first to propose durian flowers as a sustainable and cost-effective procyanidin source with potential application in the nutraceutical and cosmeceutical industries, contributing significantly to the repurposing of agricultural waste through green technology.
Some of the metrics are blocked by your
consent settings
Utilization of asphalt waste dust with fly ash in mixed cement materials for sustainable construction
(2024-10-01)
Sertsoongnern, Pimchanok
;
Ayawanna, Jiratchaya
;
Kingnoi, Namthip
;
Chaiyaput, Salisa
The production of asphalt concrete generates asphalt waste dust particles that harm the environment. In this study, asphalt waste dust and fly ash were combined in different ratios to serve as cement replacement material. With replacement ratios of 20–30 wt% asphalt waste dust with fly ash, the maximum strength of a mixed-cement sample meets the industrial requirement after 7 days of curing. Compared to a cement concrete sample, a higher strength than the industrial requirement was achieved after prolonged curing under plastic wrap. This curing condition allows the retention of Ca<sup>2+</sup> ions and moisture, contributing to the hydration and pozzolanic reactions in the mixed-cement sample. The strengthened microstructure with the C–S–H phase was clearly seen, while Ca(OH)<inf>2</inf> disappeared in the mixed-cement sample. This finding indicates that upcycled asphalt waste dust in a cement-based material is a potential method for utilizing asphalt waste dust in the construction sector.
Some of the metrics are blocked by your
consent settings
Solid waste management by RDF production from landfilled waste to renewable fuel of Nonthaburi
(2023-09-01)
Rahothan, Udorn
;
Khemkhao, Maneerat
;
Kaewpengkrow, Prangtip Rittichote
A worldwide increase in waste production and energy demand as the world's population grows and consumes more resources: therefore, sustainable waste management strategies are important. The goal of this work is to research the guidelines for the appropriate RDF production and landfill waste management of the Nonthaburi province, Thailand. Refuse Derived Fuel (RDF) produced from landfilled Waste (LW) in Nonthaburi was investigated the physicochemical. The following procedure has implemented for the production of LW to RDF of 25 tons/hr of LW; (i) the LW was placed in a pre-shredder, which was followed by a primary crusher; (ii) metals were removed from the waste stream using a magnetic separator; (iii) the LW was transferred using a conveyor belt to a dynamic disc screen, where recyclable waste was separated into smaller sizes less than 80 mm.; (iv) the waste passed through an air separator to reject high-density materials (soil and glass); (v) the undesired material were separated manually, and (vi) the desired material were baled. RDF composition consisted of 78.16-67.93% plastics, 2.29-4.34% rubber, 1.27% wood, 1.53-2.19 % textile, and other (soil-like material) 12.19-26.72%. The proximate and elemental analysis of RDF was determined according to the ASTM method. The moisture content was reduced, and the heating value increased to 18.08-29.41 MJ/kg. The results suggested high carbon and low nitrogen content suitable for energy conversion. The separation can effectively convert LW to RDF, which can be applied as an alternative fuel. Therefore, RDF can contribute to a more sustainable and circular economy.
1
Some of the metrics are blocked by your
consent settings
A review of organic waste enrichment for inducing palatability of black soldier fly larvae: Wastes to valuable resources
(2020-12-01)
Raksasat, Ratchaprapa
;
Lim, Jun Wei
;
Kiatkittipong, Worapon
;
Kiatkittipong, Kunlanan
;
Ho, Yeek Chia
The increase of annual organic wastes generated worldwide has become a major problem for many countries since the mismanagement could bring about negative effects on the environment besides, being costly for an innocuous disposal. Recently, insect larvae have been investigated to valorize organic wastes. This entomoremediation approach is rising from the ability of the insect larvae to convert organic wastes into its biomass via assimilation process as catapulted by the natural demand to complete its lifecycle. Among the insect species, black soldier fly or Hermetia illucens is widely researched since the larvae can grow in various environments while being saprophagous in nature. Even though black soldier fly larvae (BSFL) can ingest various decay materials, some organic wastes such as sewage sludge or lignocellulosic wastes such as waste coconut endosperm are destitute of decent nutrients that could retard the BSFL growth. Hence, blending with nutrient-rich low-cost substrates such as palm kernel expeller, soybean curd residue, etc. is employed to fortify the nutritional contents of larval feeding substrates prior to administering to the BSFL. Alternatively, microbial fermentation can be adopted to breakdown the lignocellulosic wastes, exuding essential nutrients for growing BSFL. Upon reaching maturity, the BSFL can be harvested to serve as the protein and lipid feedstock. The larval protein can be made into insect meal for farmed animals, whilst the lipid source could be extracted and transesterified into larval biodiesel to cushion the global energy demands. Henceforth, this review presents the influence of various organic wastes introduced to feed BSFL, targeting to reduce wastes and producing biochemicals from mature larvae through entomoremediation. Modification of recalcitrant organic wastes via fermentation processes is also unveiled to ameliorate the BSFL growth. Lastly, the sustainable applications of harvested BSFL biomass are as well covered together with the immediate shortcomings that entail further researches.
Some of the metrics are blocked by your
consent settings
Partial oxidation of synthesized wastewater containing lignin to vanillin and phenol under mild conditions
(2020-02-01)
Sriprom, Pongsert
;
Leephisuth, Pornyamon
;
Neramittagapong, Arthit
;
Neramittagapong, Sutasinee
Partial oxidation of synthesized wastewater containing lignin to form phenol and vanillin was investigated. The reactions were carried out in a high-pressure reactor at various temperatures in the range of 140–200 ° C and under the air atmosphere with the initial air pressure of 2 bar for 75 min. The addition of NaOH has a strong effect on the formation of vanillin and phenol. The results showed that the highest vanillin concentration of 23.4 ppm and the highest phenol production of 30 ppm were obtained at a temperature of 140 °C and 200 °C, respectively. The vanillin and phenol can be produced from the partial oxidation of wastewater containing lignin at mild conditions.
1

KMITL

Browse

Filters

Settings

Sort By

Results per page

Search Results