• Title/Summary/Keyword: Waste acid

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Enzymatic Biodiesel Synthesis of Waste Oil Contained High Free Fatty Acid (효소 촉매를 이용한 고산가 폐유지 유래 바이오디젤 합성)

  • Jeon, Cheol-Hwan;Lim, Kwang-Mook;Kim, Jae-Kon;Hwang, In-Ha;Na, Byung-Ki
    • Journal of the Korean Applied Science and Technology
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    • v.35 no.4
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    • pp.1048-1056
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    • 2018
  • Non-edible oil sources (i.e., Palm Acid Oil, waste animal fat) usually contain relatively high amount of free fatty acids (FFA) that make them inadequate for direct base catalyzed transesterification reaction. Enzymatic biodiesel synthesis can solve several problems posed by the alkaline-catalyzed transesterification, and has certain advantages over the chemical catalysis of transesterification, as it is less energy intensive, allows easy recovery of glycerol and the transesterification of glycerides with high free fatty acid contents. In this study, we synthesized biodiesel through enzymatic catalyzed process using high free fatty acid containing waste oil in biodiesel reactor (1 ton/day) and optimized the biodiesel production processes.

The study on the Separation of Waste acid containing Acetic acid, Hydrofluoric acid and Nitric acid (초산, 불산 및 질산을 함유한 폐혼산의 분리 연구)

  • Kim, Jun-Young;Lee, Hyang-Sook;Shin, Chang-Hoon;Kim, Ju-Yup;Kim, Hyun-Sang;Ahn, Jae-Woo
    • Proceedings of the Korean Institute of Resources Recycling Conference
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    • 2006.05a
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    • pp.47-55
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    • 2006
  • Recovery of acids from the waste etching solution of containing nitric, hydrofluoric and acetic acid discharged from silicon wafer manufacturing process has been attempted by using solvent extraction method. With EHA (2-Ethylhexlalcohol) for acetic acid and TBP(Tri-butly Phosphate) for nitic and hydrofluoric acid as extraction agent was carried on experiment to obtain the process design data in separation procedure. From the McCabe-Thiele diagram analysis, we obtained the optimum conditions of phase ratio(O/A) and stages to separate the each acid sequently from the mixture acids. The recovery yield was obtained 90% above for acetic acid from the acid mixtures, 90% above for nitric acid from acetic acid extraction raffinate and then 67% above for hydrofluoric acid from final extraction raffinate.

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Separation of Tetrodotoxin, DHA and EPA from Pufferfish Liver Waste (복어간 폐기물로부터 Tetrodotoxin, DHA 및 EPA의 분리)

  • 차병윤;최진석;임정규;이동익;이원갑;이은열;김희숙;김동수
    • Journal of Life Science
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    • v.10 no.2
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    • pp.115-124
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    • 2000
  • The present study was undertaken to separate the available components effectively, such as tetrodotoxin(TTX), docosahexaenoic acid(DHA, C22:6,ω-3) and eicosapentaenoic acid (EPA, C20:5,ω -3) from pufferfish liver waste, which are known to have high values as bioactive materials. By using ultrafiltration, it was possible to separate high contents of 68mg TTX from pufferfish liver waste. In contrast, by activated charcoal column, it was to obtain about 54mg TTX. The recovering ratios were 65.3% and 45.0% in the two different methods of ultrafiltration and activated charcoal column, respectively. From the results of HPLC and gas chromatography-mass spectrometry(GC-MS), the obtained toxins were identified to be TTX and its derivatives. In addition, it was also possible to obtain 72.3g DHA and 11.4g EPA from 1kg of pufferfish liver by high performance liquid chromatography (HPLC). These amounts of DHA and EPA were also 17.70% and 1.04% in the total lipid of pufferfish liver oil from analysis of gas chromatography(GC), respectively.

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Biological activity of peptides purified from fish skin hydrolysates

  • Abuine, Racheal;Rathnayake, Anuruddhika Udayangani;Byun, Hee-Guk
    • Fisheries and Aquatic Sciences
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    • v.22 no.5
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    • pp.10.1-10.14
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    • 2019
  • Fish skin waste accounts for part of the solid waste generated from seafood processing. Utilization of fish skin by bioconversion into high-grade products would potentially reduce pollution and economic cost associated with treating fish processing waste. Fish skin is an abundant supply of gelatin and collagen which can be hydrolyzed to produce bioactive peptides of 2-20 amino acid sequences. Bioactivity of peptides purified from fish skin includes a range of activities such as antihypertensive, anti-oxidative, antimicrobial, neuroprotection, antihyperglycemic, and anti-aging. Fish skin acts as a physical barrier and chemical barrier through antimicrobial peptide innate immune action and other functional peptides. Small peptides have been demonstrated to possess biological activities which are based on their amino acid composition and sequence. Fish skin-derived peptides contain a high content of hydrophobic amino acids which contribute to the antioxidant and angiotensin-converting enzyme inhibitory activity. The peptide-specific composition and sequence discussed in this review can be potentially utilized in the development of pharmaceutical and nutraceutical products.

A study on the Separation of Acetic Acid, Nitric Acid and Hydrofluoric Acid from Waste Etching Solution of Si Wafer Manufacturing Process (Silicon wafer 에칭공정시 발생(發生)되는 폐(廢)에칭액 으로부터 초산(醋酸), 질산(窒酸) 및 불산(弗酸)의 분리.회수(分離.回收)에 관한 연구(硏究))

  • Kim, Jun-Young;Lee, Hyang-Sook;Shin, Chang-Hoon;Kim, Ju-Yup;Kim, Hyun-Sang;Ahn, Jae-Woo
    • Resources Recycling
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    • v.16 no.1 s.75
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    • pp.59-67
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    • 2007
  • Recovery of acids from the waste etching solution of containing acetic, nitric and hydrofluoric acid discharged from silicon wafer manufacturing process has been attempted by using solvent extraction method. EHA(2-Ethylhexlalcohol) for acetic acid and TBP(Tri-butly Phosphate) for nitric and hydrofluoric acid as a extraction agent was used to the experiment to obtain the process design data in separation procedure. From the experimental data and McCabe-Thiele diagram analysis, we obtained the optimum conditions of phase ratio(O/A) and stages to separate each acid sequently from the mixed acids. The recovery yield was obtained above 90% for acetic acid from the acid mixtures, 90% for nitric acid from acetic acid extraction raffinate and then above 67% for hydrofluoric acid from final extraction raffinate.

Studies on the Development of Polymeric Flocculants of Chitosan System (Chitosan계 고분자 응집제 개발에 관한 연구)

  • Jung, Byung-Ok;Chung, Tak-Sang
    • Applied Chemistry for Engineering
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    • v.9 no.3
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    • pp.451-456
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    • 1998
  • By grafting acrylic acid, fumalic acid and maleic acid onto chitosan, graft copolymers, CsAa, CsFa and CsMa, respectively were prepared for potential uses as flocculants in waste water treatment. When 40 ppm of each grafted chitosan sample was added into the waste water, CsMa showed the best removal rate of COD and suspended solids(SS), followed by CsFa and CsAa and chitosan. The transmittance and removal rate of COD and SS were the highest at pH 5. All grafted chitosan exhibited better performance than chitosan itself, resulting from the amphiphilic property of grafted chitosan copolymer with carboxy groups.

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Acid Hydrolysis of the Waste Composts of Oyster Mushroom (느타리버섯 폐상퇴비(廢床堆肥)의 산가수분해(酸加水分解))

  • Hong, Jai-Sik;Koh, Moo-Seok;Kim, Jeong-Sook;Lee, Keug-Ro
    • Applied Biological Chemistry
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    • v.27 no.1
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    • pp.29-33
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    • 1984
  • Chemical composition and condition of acid hydrolysis of waste composts during the cultivation of oyster mushroom (Pleurotus ostreatus) were determined. Ash content of composts increased while organic matter content decreased as the cultivation progressed. More than 90% of mushroom was produced from the first and second cropping period. An optimum condition for acid hydrolysis was at 2.0% $H_{2}SO_{4},\;1.5kg/cm^{2}$ vapor pressure for 30min and 20times (acid/compost). Formation of furfural in acid hydrolysis increased remarkably as acid concentration increased.

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Evaluation of Quality Standards of Bio-Diesel (BD100, BD20) Manufactured Using Waste Frying Oil (폐식용유를 이용하여 제조한 바이오디젤(BD100, BD20)의 품질기준 평가)

  • Na, Seong-Joo;Jeon, Byung-Gwan
    • Journal of the Korea Organic Resources Recycling Association
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    • v.17 no.1
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    • pp.39-48
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    • 2009
  • Biodiesel is estimated to be the best recycling energy source as an alternative fuel for transportation vehicles which represents the biggest share of greenhouse effect gas exhausts. Thus, in order to widely expand use of biodiesel and to enhancement its reliability, studies on quality improvement of biodiesel is needed. In this study, we have produced biodiesel(BD100, BD20) through esterification reaction using raw material of waste frying oil and analyzed compatibility with 24 items of quality criteria. As waste frying oil has high contents of unsaturated fatty acid such as Oleic acid, Linoleic acid and Linolenic acid, it is confirmed that there is no problem in using the same as a raw material of biodiesel. The result of analyzing the quality criteria items of biodiesel showed that it satisfied all the quality criteria except the oxidation stability of BD100, which was 2 hours, fatty acid methyl ester of BD20, which was 18.6w% and the filter plugging point, which was $-5^{\circ}C$. We believe that it will contribute to improved utilization of waste resources as alternative energy if studies on technology to improve quality of some items are provided.

Reuse of Sodium Sulfate Recovered from Farm Drainage Salt as Dyeing Builder of Levelling Dyes - Analysis of Color Difference -

  • Jung, Jiyoon
    • The International Journal of Costume Culture
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    • v.6 no.1
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    • pp.11-18
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    • 2003
  • Agricultural drainage salt generated during irrigation of crops in San Joaquin Valley, California, exceeds 600,000 tons annually and cumulates in the field in a rapid rate. As a result, the waste is taking out more farmlands for salt storage and disposal, imposing serious concerns to environment and local agricultural industry. In searching for a potential solution to reduce or eliminate the waste, this research explored feasibility of producing a value-added product, sodium sulfate, from the waste and utilizing the product in textile dyeing. The results indicated that sodium sulfate could be produced from the salt and could be purified by a recrystallization method in a temperature range within the highest and lowest daily temperatures in summer in the valley. The recovered sodium sulfate samples, with purities ranging from 67% to 99.91, were compared with commercially available sodium sulfate in the dyeing of levelling dyes. In nylon fabrics, the salt samples had little color difference in the dyeing with C.I. Acid Yellow 23 and C.I. Acid Blue 158. All salt samples' gray scale was 5 grade. In wool fabrics, the salt samples had little color difference in dyeing with C.I. Acid Yellow 23 and C.I. Arid Blue 158. All salt samples' gray scale was 5 grade. Generally, the dyeing of levelling dyes using recovered salts from farm drainage had little color difference than the dyeing of levelling dyes using commercial sodium sulfate.

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Influence of Culture Media Formulated with Agroindustrial Wastes on the Antimicrobial Activity of Lactic Acid Bacteria

  • Linares-Morales, Jose R.;Salmeron-Ochoa, Ivan;Rivera-Chavira, Blanca E.;Gutierrez-Mendez, Nestor;Perez-Vega, Samuel B.;Nevarez-Moorillon, Guadalupe V.
    • Journal of Microbiology and Biotechnology
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    • v.32 no.1
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    • pp.64-71
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    • 2022
  • The discarding of wastes into the environment is a significant problem for many communities. Still, food waste can be used for lactic acid bacteria (LAB) growth. Here, we evaluated three growth media equivalent to de Mann Rogosa Sharpe (MRS), using apple bagasse, yeast waste, fish flour, forage oats, and cheese whey. Cell-free supernatants of eight LAB strains were tested for antimicrobial activity against nine indicator microorganisms. The supernatants were also evaluated for protein content, reducing sugars, pH, and lactic acid concentration. Cell-free supernatants from fish flour broth (FFB) LAB growth were the most effective. The strain Leuconostoc mesenteroides PIM5 presented the best activity in all media. L. mesenteroides CAL14 completely inhibited L. monocytogenes and strongly inhibited Bacillus cereus (91.1%). The strain L. mesenteroides PIM5 consumed more proteins (77.42%) and reducing sugars (56.08%) in FFB than in MRS broth (51.78% and 30.58%, respectively). Culture media formulated with agroindustrial wastes positively improved the antimicrobial activity of selected LAB, probably due to the production of antimicrobial peptides or bacteriocins.