Papers by varinthorn boonyaroj
Elsevier eBooks, 2023
Bookmarks Related papers MentionsView impact
Journal of Applied Membrane Science & Technology, 2017
Two-stage membrane bioreactor was applied to the treatment of municipal solid waste landfill leac... more Two-stage membrane bioreactor was applied to the treatment of municipal solid waste landfill leachate. This study aimed to evaluate the toxicity of treated leachate by this system. Bio-toxicity (acute and geno-toxicity) were conducted using O. niloticus and C. carpio. The lethal concentrations (LC50) of selected species exposed to raw leachate and treated leachate were investigated. Comet assay was utilized for evaluation of geno-toxicity potential of raw and treated leachate using carried out at the 10th percentile of lethal concentration (LC10) that obtained from the acute toxicity test. The relationship between pollutant concentrations i.e., NH3, COD and mortality were analyzed on Finney’s probit analysis. The results found that ammonia was the principal pollutants causingtoxicity in landfill leachate. Nevertheless, toxicity effect between ammonia and organic concentrations was also observed. The corresponding ammonia concentration causing 50% mortality of C. carpio and O. niloti...
Bookmarks Related papers MentionsView impact
Water Science and Technology, 2012
Two-stage membrane bioreactor (MBR) system was applied to the treatment of landfill leachate from... more Two-stage membrane bioreactor (MBR) system was applied to the treatment of landfill leachate from a solid waste disposal site in Thailand. The first stage anoxic reactor was equipped with an inclined tube module for sludge separation. It was followed by an aerobic stage with a hollow fiber membrane module for solid liquid separation. Mixed liquor sludge from the aerobic reactor was re-circulated back to anoxic reactor in order to maintain constant mixed liquor suspended solids (MLSS) concentration in the aerobic reactor. The removal of micro-pollutants from landfill leachate along the treatment period of 300 days was monitored. The results indicated that two-stage MBRs could remove biochemical oxygen demand (BOD), chemical oxygen demand (COD) and NH4+ by 97, 87 and 91% at steady operating condition. Meanwhile organic micro-pollutant removals were 50–76%. The removal efficiencies varied according to the hydrophobic characteristic of compounds but they were improved during long-term M...
Bookmarks Related papers MentionsView impact
Bioresource Technology, 2012
Bookmarks Related papers MentionsView impact
Journal of Hazardous Materials, 2017
Bookmarks Related papers MentionsView impact
Applied Mechanics and Materials, 2017
Panicum repens is a species of grass known by many common names, including torpedo grass, creepin... more Panicum repens is a species of grass known by many common names, including torpedo grass, creeping panic, panic rampant, couch panicum, wainaku grass, quack grass, dog-tooth grass, and bullet grass. The paper has been made from non-wood materials for long times. This research was used Panicum repens for made grass pulp as non-wood fiber. The influence of sodium hydroxide (NaOH) concentrations on properties of pulp from Panicum repens was investigated under room temperature. NaOH concentration levels were varied at 0%, 5%, 10%, 15%, and 20%, respectively. Moreover, Paper pulp from Panicum repens was observed by scanning electron microscope (SEM). This research has controlled the length of fiber approximately 0.5-2.5 cm before soaked with NaOH concentration at 1 hour and soak with water for controlled pH value at 7-8. Paper pulp was formed on a sieve. The result showed that color of paper pulp made from Panicum repens was light brown and green. SEM showed that NaOH concentration affec...
Bookmarks Related papers MentionsView impact
Applied Mechanics and Materials, 2018
This research aims to fabrication and evaluation the properties of cement reinforcement made from... more This research aims to fabrication and evaluation the properties of cement reinforcement made from Panicumrepens. The research is divided into two parts are as follows; to determined the optimal ratio selection, and to compare the properties of Panicumrepens reinforced cement, and without grasses by using the optimal ratio. The raw materials used in this research were cut in length of 2.0-2.5 cm. In this research was determined the properties of Panicumrepens reinforced cement in terms of bulk density, water absorption, and compressive strength. The influence of fibers soaked with 5% of sodium hydroxide concentration was also conducted in this research. The surface structure and chemical characteristics of fibers used to produce reinforced cement were observed by using scanning electron microscope (SEM), and energy dispersive x-ray spectrometer (EDS), respectively. Moreover, relationships of information collected from this research were concerned. Furthermore, the addition of Panicum...
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
Two-stage membrane bioreactor (MBR) was applied to the treatment of leachate from a solid waste d... more Two-stage membrane bioreactor (MBR) was applied to the treatment of leachate from a solid waste disposal site in Thailand. Priority micropollutants in landfill leachate were phenolics 4-methyl-2,6-di-tert-butylphenol (BHT), bisphenol A (BPA) at higher concentrations above 100 µgL-1, PAEs i.e. dimethyl phthalate (DMP), diethyl phthalate (DEP), di-n-butyl phthalate, di-n-octyl phthalate (DnOP), and di(2-ethylhexyl) phthalate (DEHP). It was found that MBR could remove phenolic compounds and PAEs by 77–96%.The removal efficiency of micropollutants are depends on their log KOW as well as their speciation behaviour. In laboratory scale experiment, the removals of BPA, BHT, and DEHP were 65%, 70%, 72%, respectively at initial concentration of 1,000 µg.L-1. The removal mechanisms can be classified into adsorption, biodegradation, and rejection of micropollutants during membrane filtration. The removals of BPA, BHT, and DEHP were found improve using enriched nitrifying sludge in comparison non-enriched condition. In contrast, DEHP was mainly adsorbed on the sludge surface and subsequently rejection by membrane filtration. The biotoxicity of treated water was reduced during MBR treatment as revealed by acute toxicity and genotoxicity tests.
Bookmarks Related papers MentionsView impact
Uploads
Papers by varinthorn boonyaroj