Biodegradability Improvement and Structural Conversion of Polyvinyl Alcohol (PVA) by Sub- and Supercritical Water Reaction

Kim, Kyoungrean; Fujita, Masafumi; Daimon, Hiroyuki; Fujie, Koichi

doi:10.1252/jcej.37.744

Cited by 10 publications

(11 citation statements)

References 15 publications

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“…The reaction times were set as shown in Table 1. They were defined as the elapsed time from the heat-up time to reach 90% of each reaction temperature [18]. Saturated vapor pressures at the specific temperature were selected for liquid phase reaction.…”

Section: Experimental Methodologiesmentioning

confidence: 99%

“…Thus, the ratios are commonly used to evaluate biodegradability of substances [18]. In this research, the ratio of BOD/COD Cr was selected as the index of biodegradability.…”

Section: Biodegradability Improvement Depending On Reaction Conditionsmentioning

confidence: 99%

“…In case of resource recovery, reactions must be conducted under sub-critical water conditions to prevent complete decomposition of desired products [16,17]. However, hydrothermal reaction has not been applied as a method for partial destruction of refractory pollutants enough to improve their biodegradability, except our previous results related to biodegradability improvement and structural conversion of polyvinyl alcohol [18].…”

Section: Introductionmentioning

confidence: 97%

See 2 more Smart Citations

Change of monochloroacetic acid to biodegradable organic acids by hydrothermal reaction

Kim

Fujita

Daimon

et al. 2004

Journal of Hazardous Materials

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Section: Experimental Methodologiesmentioning

confidence: 99%

“…Thus, the ratios are commonly used to evaluate biodegradability of substances [18]. In this research, the ratio of BOD/COD Cr was selected as the index of biodegradability.…”

Section: Biodegradability Improvement Depending On Reaction Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

See 1 more Smart Citation

Change of monochloroacetic acid to biodegradable organic acids by hydrothermal reaction

Kim

Fujita

Daimon

et al. 2004

Journal of Hazardous Materials

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“…The mean BOD/COD ratio was 0.57 ± 0.12 (range 0.42-0.78). BOD/COD ratio above 0.4 indicates that the remaining carbon in water is considered degradable (Chamapro et al 2001;Yu and Yu 2002;Kim and Daimon 2004). Generally, all measured characteristics have normal distribution.…”

Section: Characteristic Of the Samplesmentioning

confidence: 99%

Pioneering investigation of the characteristics and elemental concentrations in the environment of the declining Wadi Maryut Lake

Hassan

Badran

2016

Environ Monit Assess

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Wadi Maryut Lake is one of the remaining parts of the ancient Lake Mareotis and is not mentioned in the scientific literature. For the first time, physical and chemical characteristics as well as elemental concentrations in sediment, water, soil, and plants were determined. The lowest metal pollution indices are in the northeastern end of the lake and tend to increase toward the other end. In lake aquatic environment, Al, Fe, K, Mn, Na, B, and Cr are more likely to exist in insoluble form in the southwestern part and in soluble form in the northeastern part. Using different approaches to assess sediment contamination demonstrates that sediments can be categorized as unpolluted. However, the geo-accumulation index suggests that two locations have low anthropogenic influence of Pb and the enrichment factors and the degree of contamination indicate that Co and Pb may be enriched in sediment of some locations. Comparisons with consensus-based sediment quality guidelines revealed that no sample exceeded the probable effect concentration for Cr, Cu, Ni, Pb, and Zn. The most mobile elements in sediment-water and soil-plant systems are Na, K, and Pb. In sediment-water system, Al, Fe, and Mn oxides have the major influence on scavenging of B, K, and Cr. Similarity in the occurrences of Mn, K, and Fe in soil and Mn and Fe in wild plant was found. This work demonstrates the state of decontamination of the lake and confirms its importance as a reference and comparative case for south Mediterranean coastal water bodies.

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“…In previous work (Kim et al, 2003(Kim et al, , 2004Quitain et al, 2002), the production of biodegradable substrates through hydrolysis of non biodegradable substrates was reported. Making use of this knowledge, excess sludge is treated in HTHP water for the purpose of obtaining biodegradable substrates through change in content of the treated excess sludge.…”

Section: Introductionmentioning

confidence: 99%

Biological phosphate removal using a degradable carbon source produced by hydrothermal treatment of excess sludge

Haraguchi

Fujita

Daimon

et al. 2006

Braz. J. Chem. Eng.

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-The possibility of reusing excess sludge treated by hydrothermal reaction for the purpose of improving the efficiency of the enhanced biological phosphate removal (EBPR) process was investigated. Excess sludge from a fish-processing industry located in Japan was treated in high-temperature and high-pressure water, at a reaction temperature ranging from 200 to 400 o C, a pressure of 1.8 to 30MPa and a constant reaction time of 7 min. For the conditions tested, the results showed that when the reaction temperature was increased the content of readily biodegradable substrate in the total COD Cr increased. In addition, the amount of some volatile fatty acids (VFAs) produced by the hydrothermal reaction increased as reaction temperature increased. From the phosphate release tests under anaerobic conditions, it was possible to demonstrate that not only the VFAs, but also the readily and slowly biodegradable substrates are used as potential carbon source by the phosphate-accumulating organisms (PAOs).

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Biodegradability Improvement and Structural Conversion of Polyvinyl Alcohol (PVA) by Sub- and Supercritical Water Reaction

Cited by 10 publications

References 15 publications

Change of monochloroacetic acid to biodegradable organic acids by hydrothermal reaction

Change of monochloroacetic acid to biodegradable organic acids by hydrothermal reaction

Pioneering investigation of the characteristics and elemental concentrations in the environment of the declining Wadi Maryut Lake

Biological phosphate removal using a degradable carbon source produced by hydrothermal treatment of excess sludge

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