• Title/Summary/Keyword: Sodium hydroxide Treatment

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COLONIZATION OF ALKALI-TREATED FIBROUS ROUGHAGES BY ANAEROBIC RUMEN FUNGI

  • Wuliji, T.;McManus, W.R.
    • Asian-Australasian Journal of Animal Sciences
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    • v.1 no.2
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    • pp.65-71
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    • 1988
  • This study reports light and electron microscope examination of rumen fungal colonization of alkali-treated roughage feeds incubated in decron bags in the rumen of cannulated sheep for varying time intervals. Six roughages, pre-treated with ammonium hydroxide or sodium hydroxide at 4% (w/w) level were examined together with untreated control samples. Alkali pre-treatment was associated with an earlier and more pronounced fungal colonization than all control roughages. Sodium hydroxide pre-treatment was significantly more effective than ammonium hydroxide in improving the susceptibility of roughages to rumen fungal colonization and studies by SEM showed that the pre-treatment permitted greater penetration of feeds by fungi. Sodium hydroxide pre-treatment also significantly increased dry matter disappearance from feed held in Dacron bags in the rumen with all feeds except Lucerne stem. It is not known to what extent fungal activity contributed to increased breakdown of the feeds.

Physical Properties and Fine Structure of Cotton Mercerized in Ammonia Water/Sodium Hydroxide(1) (암모니아수/수산화나트륨에서 처리된 면의 미세구조와 물리적 성질(I))

  • Choi Chul-Ho;Kim Mee-Sun;Lee Chan-Min
    • Journal of the Korean Society of Clothing and Textiles
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    • v.12 no.2 s.27
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    • pp.181-188
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    • 1988
  • Cotton fabrics were slack-mercerized in sodium hydroxide, ammonia water(min. $28{\%}\;NH_3$), and mixture of ammonia water/sodium hydroxide. The surface of treated cotton fabrics were observed through SEM, and the changes of fine structure were analyzed by X-ray diffractometer. In addition to that shrinkage was compared mutally, and tenacity-elongation compared, too. SEM photographs showed fibrls rearranged strightly toward fibre axis. X-ray diffraction represented increased amorphous fraction, and partial recrystallization into cellulose 2 lattic after treatment with sodium hydroxide and mixture of ammonia water/sodium hydroxide. The mercerization produced increased fibre tenacity-elongation with slark state. Lastly, the best condition of mercerization was $4\%/14\%$, $10^{\circ}C,\;5\~30$ min. in mixture of ammonia/sodium hydroxide.

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Total Utilization of Woody Biomass by Steam Explosion(I) -Delignification of pine and oak exploded wood- (폭쇄법(爆碎法)을 이용(利用)한 목질계(木質系) Biomass의 종합적(綜合的) 이용(利用)(I) -소나무와 신갈나무 폭쇄재(爆碎材)의 탈(脫)리그닌처리(處理)-)

  • Lee, Jong-Yoon;Chang, Jun-Pok;Yang, Jae-Kyung
    • Journal of the Korean Wood Science and Technology
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    • v.20 no.3
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    • pp.11-20
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    • 1992
  • Steam explosion is one of the most effective pretreatment for fractionating wood. This leads to the total utilization of wood basic components; cellulose, hemicellulose and lignin. The amount of sugar and lignin extracted with the hot water method was very low. The lignin content of residues after extraction with using a sodium hydroxide treatment, increased delignification of carbohydrate as the concentration of alkali was increased. Oak, pretreated with steam exploded at 25kg/$cm^2$ for 6 min. then 1% alkali for 2hrs. showed a delignification rate up to 95%. A sodium chlorite treatment of steam exploded pine and oak also afforded a high deligninfication effect. Pine, treated 10% sodium chlorite for 2hrs. showed high delignification. However, by using a sodium hydroxide treatment, a 2% retreatment for Ihr. after a 2% for 2hrs. afforded remarkable delignification effect on exploded wood at 30kg/$cm^2$ for 9min. and at 35kg/$cm^2$ for 3-6min. In oak, an initial 2hrs. treatment of 2% sodium chlorite was followed by a second 2hrs. treatment at 10%. This showed a delignification rate of 96%.

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Effects of Alkaline Treatment on the Characteristics of Chemical Pulps for Papermaking (알칼리 처리가 제지용 화학펄프의 특성에 미치는 영향)

  • Won, Jong-Myoung;Kim, Min-Hyun
    • Journal of Korea Technical Association of The Pulp and Paper Industry
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    • v.43 no.3
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    • pp.106-112
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    • 2011
  • The effects of alkaline treatment on the WRV, crystalline structure and sheet structure of softwood and hardwood bleached kraft pulp were investigated. Sodium hydroxide and sodium carbonate were used as chemicals for alkaline treatment and two levels of alkali dosage (5%, 10%) were applied respectively. Alkali treated and untreated pulp were refined to three levels (550, 450 and 350 mL CSF). WRV of the alkali treated pulps depended on the alkaline type and concentration. It was found that the crystalline structures of softwood and hardwood pulp were not changed by refining. Sodium carbonate and lower concentration of sodium hydroxide treatment did not caused any modification of cellulose crystalline structure, while higher concentration of sodium hydroxide treatment caused the partial modification of cellulose crystalline structure. Alkaline treatment of hardwood bleached kraft pulp led to the shrinkage of fiber diameter and bulky structure of sheet. Alkaline treatment of softwood bleached kraft pulp did not cause the significant change in fiber shrinkage and bulk of sheet.

The Porosity and the Dyeability of Polyester Fiber Treated with Sodium Hydroxide Aqueous Solution (알칼리 감량 폴리에스테르 섬유의 기공도와 염색성)

  • 김병인;김태경;임용진;조광호;조규민
    • Textile Coloration and Finishing
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    • v.12 no.6
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    • pp.380-388
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    • 2000
  • The porosity of polyester fibers treated with sodium hydroxide aqueous solution was investigated using a nitrogen porosimeter, and the dyeability of the treated fibers was discussed in terms of the porosity. In pore distribution, the polyester fibers treated with sodium hydroxide aqueous solution were characterized by higher amount of pores below $10\AA$ than those of the untreated fibers, and by shift of the pore size having maximum accumulated volume from $10\AA$ for the untreated fibers to $5~6\AA$. As the weight loss of the polyester fibers treated with sodium hydroxide aqueous solution increased, BET surface area and total pore volume increased linearly, but average pore size, showing some different aspect, increased steeply at earlier stage and then approached the maximum value. The dye uptakes of the polyester fibers treated with sodium hydroxide aqueous solution increased with the BET surface area, the total pore volume and the average pore size. The alkali treatment increased the surface area of polyester fibers, so that the chance of contact between the fiber and dye molecules increased. In addition, the pores created on the surface of polyester fibers by alkali treatment might act as pathways for dye molecules into the polyester fibers.

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The Effect of Ammonia and Sodium Hydroxide Treatment on the Storage and Rumen Microbial Fiber Degradation in Silage of Rice Straw Contaminated Mycotoxin (암모니아 및 가성소다 처리가 Mycotoxin 오염 사료용 볏짚의 사일레지 저장 및 반추위 미생물의 섬유소 분해에 미치는 영향)

  • Sung, Ha Guyn
    • Journal of The Korean Society of Grassland and Forage Science
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    • v.40 no.2
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    • pp.80-86
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    • 2020
  • This study was conducted to research on the efficacy of chemical treatment as an effective method for reducing mycotoxin in rice straw silage. As a chemical treatment method, ammonia and sodium hydroxid were treated at 4% level of rice straws contaminated with mycotoxin, and the effects of silage storage on fungal toxin reduction, fermentation quality, and fiber digestion were evaluated. Aflatoxin B1, B2, G1, G2 and fumonisin B1, B2 as well as deoxynivalenol were not detected in all experimental groups, and ochratoxin A and zearalenone were detected. Ochratoxin A was detected lower in the chemical treatment than control (41.23 g / kg) (p<0.05). Zearalenone showed lower results in sodium hydroxide treatment (297.44 ㎍ / kg) than control (600.33 ㎍ / kg) and ammonia treatment (376.00 ㎍ / kg) (p<0.05). The pH of rice straw silage was the lowest in ammonia treatment and the highest in sodium hydroxide treatment (p<0.05). The lactic acid contents of control and ammonia treatments were similar, but sodium hydroxide treatment was the lowest (p<0.05). Propionic acid was higher in the control than in the chemical treatments (p<0.05), and showed similar contents in the ammonia and sodium hydroxide treatment. Both the rumen microbial degradation rate of NDF and ADF showed the highest in sodium hydroxide treatment, followed by ammonia treatment, and the control showed the lowest level (p<0.05). Therefore, the results of this study are demonstrated to have a good effect on the treatment of ammonia and sodium hydroxide to reduce the mycotoxins and increase the rumen microbial degradation rate in the rice straw silage. Sodium hydroxide treatment was more effective in reducing mycotoxins and improving fiber degradation rate than ammonia treatment, but it is thought to have an inefficient effect on silage fermentation in rice straw silage.

Effect of Alkali-Washing at Different Concentration on the Chemical Compositions of the Steam Treated Bamboo Strands

  • MAULANA, Muhammad Iqbal;MURDA, Rio Ardiansyah;PURUSATAMA, Byantara Darsan;SARI, Rita Kartika;NAWAWI, Deded Sarip;NIKMATIN, Siti;HIDAYAT, Wahyu;LEE, Seung Hwan;FEBRIANTO, Fauzi;KIM, Nam Hun
    • Journal of the Korean Wood Science and Technology
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    • v.49 no.1
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    • pp.14-22
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    • 2021
  • The objective of this study was to investigate the effect of alkali-washing with different sodium hydroxide concentrations on the chemical compositions of steam-treated Betung bamboo strand. Strands were subjected to steam treatment at 126 ℃ for 1 h under 0.14 MPa pressure and followed by washing with 1-5% sodium hydroxide solution for 30 sec. The alteration of structural and non-structural chemical components content of bamboo strands was evaluated. Steam and washing treatments with various concentrations of sodium hydroxide solution considerably reduced the extractive content of bamboo strands, and the cell wall chemical components of the strand in the small degree. FTIR analysis showed noticeable changes in peaks related to hemicellulose and lignin. The relative crystallinity increased significantly after steam and washing treatment with sodium hydroxide up to 3% concentration. SEM Images showed smooth and clean strands surface after washing with 3% sodium hydroxide.

Effect of Sodium Hydroxide Treatment on Nutritive Value of Pelleted Rye Hay (호밀건초 Pellet 조제시 NaOH 처리가 사료가치에 미치는 효과)

  • 한성윤;김대진
    • Journal of The Korean Society of Grassland and Forage Science
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    • v.20 no.3
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    • pp.155-160
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    • 2000
  • This syudy was conducted to increase the utility of forage rye which are suitable to be cultivated at high altitude Taekwllyong area. For that purpose two cultivars of rye (winter-more, kool-glazer) were cultivated for 3years using a randomized block design with 3 replications. The dry matter digestibility (DMD) was evaluated with the pelleted rye hay produced by adding sodium hydroxide and then the TDN value was calculated by the DMD. By adding NaOH, DMD and TDN value of rye pellets (Y=46.92+ 1.8X, ~ 0 . 9 7 )w ere increased significantly (p<0.05) and NDF (neutral detergent fiber) decrease significantly. However, ADF (acid detergent fiber) and lignin did not significantly decrease (p<0.05). Rye could be cultivated as a second crop after com at high altitude area in the same year and pelleted with NaOH in order to increase the nutritive values (p< 0.05). (Key words : Dry matter digestibility (DMD), Forage rye, NDF, ADF, Sodium hydroxide)

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A study on Nickel Hydroxide Crystallization for Plating waste Treatment

  • Lee, Chang-Hwan;Lee, Choul-Ho
    • Proceedings of the IEEK Conference
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    • 2001.10a
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    • pp.292-295
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    • 2001
  • A Study on the precipitation characteristics of nickel hydroxide as well as carbonate and sulfide is carried out to determine the proper treatment condition of the wastewater induced from nickel-plating industry. The nickel concentrations in the effluent could be kept lower than 5ppm when the value of pH was maintained higher than 10. The precipitation of nickel salts by alkaline addition to the nickel containing model wastewater was conducted by using proper amount of sodium hydroxide, sodium carbonate, sodium bicarbonate and sodium sulfide. In case of the sulfide treatment, the residual nickel concentration in the clear water after precipitates removed showed the lowest value. The influences of the precipitation condition upon the particle size of the crystals precipitated were also investigated. In spite of the various precipitation conditions were adopted, the particle size of the precipitated crystals showed no great differences. The sedimentation rates of the precipitated particle bed were observed and the free sedimentation period was terminated within 20 minutes. Although the hindered sedimentation as well as bed compaction progressed subsequently, the bed heights were maintained almost the same level after two hours of sedimentation.

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Chemical Treatment for the Destruction of Aflatoxins in Laboratory Waste Water (실험실 폐수중 Aflatoxin 감소를 위한 화학적 처리에 관한 연구)

  • 김종규
    • Journal of Environmental Health Sciences
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    • v.18 no.2
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    • pp.52-56
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    • 1992
  • The ability of chemicals, 10% sodium hypochlorite, 28% ammonium hydroxide, 5% sodium hydroxide, 5% sodium bicarbonate, 0.1% hydrochloric acid, 5% hydrogen peroxide, and 5% acetone, to destroy aflatoxins in laboratory waste water containing 3.26 ppb of B$_{1}$ 7.64 ppb of B$_{6}$3 ppb of G$_{1}$, and 11.39 ppb of G$_{2}$ with the total of 29.11 ppb was investigated. High performance liquid chromatograph (HPLC) was used for the separation and quantitation of aflatoxins. Treatment for 2 hours by the chemicals affected the destruction of aflatoxins and the most effective chemical was 10% sodium hypochlorite (p<0.05). Sodium hypochlorite concentrations more than 1% significantly reduced aflatoxin B$_{2}$, G$_{1}$, G$_{2}$ and total aflatoxins and more than 3% reduced B$_{1}$ (p<0.05). No further significant decreases were observed above the concentration of 5% for all 4 aflatoxins. Complete destruction of aflatoxins B$_{2}$, G_{1}$, and G$_{2}$ was achieved by 5% sodium hypochlorite at 48 hours and B$_{1}$ at 72 hours.

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