• Title/Summary/Keyword: white water

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Characteristics of White Water from Enzyme Deinking process for ONP at Low Alkalinity

  • Eom, Tae-Jin
    • Journal of Korea Technical Association of The Pulp and Paper Industry
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    • v.41 no.5
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    • pp.44-49
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    • 2009
  • Old newspaper was deinked using commercial cellulolytic enzymes and a surfactant complex at low alkalinity. The properties of the deinked pulp(DIP) were evaluated and the suspended solids content, cationic demand, turbidity, and chemical oxygen demand(COD) of the process water were measured. The results can summarized as follows, 1. The brightness and yield of the DIP were improved using enzymatic surfactant complex deinking. 2. The amount of foaming during deinking with the enzyme surfactant complex was higher than that with synthetic surfactant deinking. However, it was not sufficient to cause process problem. 3. The pH and turbidity of the white water from deinking with the enzyme surfactant complex were similar to those of the white water from surfactant deinking. 4. The suspended solids content, cationic demand, and COD of the white water from deinking with the enzyme surfactant complex were improved compared to those of the white water from surfactant deinking.

A Quantitative Analysis of Dissolved Starch in White Water by UV Spectroscopy (분광분석법을 이용한 공정백수에서의 전분 정량분석)

  • Jung So-Hyun;Ryu Jeong-Yong;Kim Hyoung-Jin
    • Journal of Korea Technical Association of The Pulp and Paper Industry
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    • v.37 no.4 s.112
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    • pp.38-43
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    • 2005
  • Natural Com Starch(NCS) spray system has been widely used In multiply board mill for the better bonding strength between board layers. However the unsuitable NCS spray system could lead to a drop in plybond efficiency of multiply board. It could also result in the accumulation of unretained-starch in the white water system, which could not only rise in BOD and COD level but also reduce the effects of rosin-alum sizing system and other additives. In this study, the simple and rapid method by UV-spectroscopy for measuring the starch contents in the white water was proposed, and the quantitative analysis for dissolved starch content in white water was carried out in two kinds of board production process. It could be confirmed that about 150 ppm of oxidized starch was retained in white water dewatered from undertop ply of multiply board process, and about 470 ppm of natural starch was dissolved in white water originated from unsuitable spraying system in the multiply board production lines for cup base paper.

Recycling of Wastepaper(V): -Calcium Hardness Control of Process Water for Zero-Discharge System- (고지재상연구 (제5보) -공정수 폐쇄화를 위한 칼슘경도 조절-)

  • 지경락;류정용;신종호;송봉근;오세균
    • Journal of Korea Technical Association of The Pulp and Paper Industry
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    • v.31 no.2
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    • pp.15-24
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    • 1999
  • A new technique for recycling of white water was developed in order to reduce the calcium hardness in a closed OCC recycling system. Calcium ions present in the white water were precipitated as calcium carbonate by reacting with sodium carbonate, and the precipitated $CaCO_3$ was removed from the system using a flotation fractionation method, which has been commonly used in deinking process. In the flotation stage, a mixed gas of $CO_2$-air was purged into the flotation cell because the pH of $Na_2CO_3$-treated white water was reduced to neutral by $CO_2$ gas. Since $CaCO_3$ precipitate tends to stick onto fine fiber surface and then selectively removed from the white water, a proper amount of suspended solid in white water acts as an important factor for deciding the removal efficiency. By the application of $Na_2CO_3$ addition-$CO_2$ flotation to the short circulated white water, the calcium hardness was significantly reduced by 87% and more. Removal of calcium ions with fine fibers led to a drainage improvement, reduction of fresh water consumption, and enhanced efficiency of wet-end chemicals.

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Effect of White Water Quality on AKD Sizing of Linerboard (백수의 수질에 따른 라이너지의 AKD 사이징)

  • Lee, Hak-Lae;Seo, Man-Seok;Shin, Jong-Ho;Youn, Hye-Jung
    • Journal of Korea Technical Association of The Pulp and Paper Industry
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    • v.38 no.2 s.115
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    • pp.9-15
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    • 2006
  • Neutral sizing is required for linerboard to solve the troubles in strength and process caused by recycled raw materials. AKD sizing efficiency can be influenced by process condition like white water quality, fines retention and so on. Therefore, this study was aimed to evaluate sizing performance of general and fast cure type AKDs using process water obtained from linerboard mill. To evaluate effect of process water quality on AKD sizing, white water was diluted with tap water at the different dilution ratios and UKP slurry was sized using the prepared water. Also, effects of inorganic and organic ion material on sizing were examined. When white water was used for stock forming, UKP sheet showed very low sizing degree. Sizing degree of sheet was increased with increase of dilution ratio because water quality was improved. Especially anionic organic material had a greater influence on AKD sizing than inorganic material. When white water quality was deteriorated, fast cure type AKD showed superior sizing performance to general type AKD.

Effect of $pi-Water$ on the Quality Characteristics of White Pan Bread ($\pi-Water$ 첨가가 식빵 품질 특성에 미치는 영향)

  • 김동호;오철환
    • Journal of the East Asian Society of Dietary Life
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    • v.14 no.1
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    • pp.47-53
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    • 2004
  • The characteristics of dough and the quality of white pan bread with 0∼1.5% $\pi$-water were investigated. The fermentation volume and weight of the white pan bread with $\pi$-water (0.1%, 0.5%, 1.0%, 1.5%) was higher than that of the control. The volume of white pan bread with $\pi$-water (0.1%, 1.0%, 1.5%) was higher than that of the control. Color L value of crust with $\pi$-water increased from 34.98 to 36.38∼41.36 and increased from 34.32 to 34.90∼43.33 after 3 days. Color a value increased from 14.78 to 14.99∼16.75. The hardness of the white pan bread increased from 29011.0 g/㎤ to 18681.7∼43551.2 g/㎤ as the added amount of $\pi$-water increased. The overall acceptability score of white pan bread was the highest with 0.1% $\pi$-water.

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HPLC Study for Egg White Analysis (달걀 단백질 분석을 위한 HPLC 연구)

  • Jeon, Young-Ju;Lee, Eun;Kim, In-Ho
    • KSBB Journal
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    • v.22 no.2
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    • pp.119-122
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    • 2007
  • Since egg white contains various protein, it is important to research the protein distribution of egg white. Specially, lysozyme and ovalbumin important proteins, are used in medicine and food industry. Reversed phase high performance liquid chromatography has been used for separation of egg white, and column of RP-HPLC is available in variety. We have used C4, C8 and C18 columns to obtain chromatograms by varying carbon chain length of stationary phase. Long carbon chain length of stationary phase has good separation of egg white. Also, we have changed the composition of mobile phase (acetonitrile, water, and trifluoroacetic acid) to find optimum chromatograms. Acetonitrile and water composition of 50 : 50 show many peaks from egg white. Isocartic and gradient elution in RP-HPLC were used to compare the chromatography of egg white.

Studies on the Thermostability of Myofibrillar Proteins from Fresh Water Fish and Sea Water Fish (담수어와 해수어의 근원섬유단백질의 열안정성에 관한 연구)

  • 신완철;송재철;최석영;홍상필
    • Journal of the Korean Society of Food Science and Nutrition
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    • v.30 no.4
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    • pp.574-578
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    • 2001
  • Myofibrillar proteins were prepared from red muscle and white muscle of fresh water fish and sea water fish, and their thermostabilities and effect of temperature on the myofibrillar ATPase activities were compared. Differences in temperature dependency of myofibrillar ATPase activities were found between two species. Thermodynamic data for inactivation of myofibrillar proteins, such as D value, Z value, $\Delta$ $H^{{\neq}}$, $\Delta$ $G^{{\neq}}$ and $\Delta$ $S^{\neq}$ revealed that thermostabilities of myofibrillar proteins from fresh water fish were higher than those from sea water fish, and that myofibrillar proteins from red muscle were more heat labile than those from white muscle.

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Comparison of Biochemical Characteristics of Myofibrillar Protein from Fresh Water Fish and Sea Water Fish (담수어와 해수어의 근원섬유단백질의 특성 비교)

  • 신완철;송재철;홍상필;김영호
    • Journal of the Korean Society of Food Science and Nutrition
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    • v.28 no.2
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    • pp.292-298
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    • 1999
  • Myofibril and actomyosin were prepared from red muscle and white muscle of fresh water fish and sea water fish, and their biochemical characteristics and SDS PAGE patterns of myofibril were compared. SDS PAGE analysis showed that electrophoretic patterns of myofibril were similar be tween white muscle and red muscle, while difference of 30kDa component of myofibril was detected between fresh water fish and sea water fish. When myofibril were treated with trypsin, difference in hydrolysis of heavy chain was observed between white muscle and red muscle. In activities of Ca ATPase, Mg ATPase, EDTA ATPase and ATPase activity pH curve, myofibrillar protein from fresh water fish showed higher specific activity than those from sea water fish.

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A Study on the Accumulation Phenomena of Oxidized Starch in White Water of Closed Fine Papermaking Process (Part 3) -Effect of white water and broke use ratios on the unsteady state of papermaking process- (백상지 공정 폐쇄화에 따른 백수 내 산화전분의 축적 현상에 관한 연구 ( 제 3 보 ) -백수사용량과 파지첨가량 변화에 따른 공정의 비정상상태 변화 -)

  • Ahn, Hyun-Kyun;Lee, Hak-Lae
    • Journal of Korea Technical Association of The Pulp and Paper Industry
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    • v.38 no.2 s.115
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    • pp.1-8
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    • 2006
  • In this study a process simulation method was used to analyze the accumulation phenomena of anionic starch in the process white water as the closure level of a fine paper making process is increased. A pilot paper machine was used as a model process. Dynamic simulations of the influence of white water usage ratio and uncoated broke addition ratio on the variation of process variable was monitored as a function of time. Results from the dynamic simulations showed that the volume of reservoirs affected the dynamic behavior of the process. The dynamic behavior of flow rate and dissolved starch concentration in process units were different from each other. The speed of the change of dissolved starch concentration in process units was depend on the starting point of the change of dissolved starch concentration, the length of circulation loop, and the volume of reservoirs.

The Effect of White Water Components on Mechanical Properties of Linerboard (라이너지 공정수의 구성 성분이 종이의 물성에 미치는 영향)

  • 윤혜정;류정용;송봉근;조미선
    • Journal of Korea Technical Association of The Pulp and Paper Industry
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    • v.36 no.1
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    • pp.9-15
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    • 2004
  • Micro inorganic solids and dissolved materials contained in the white water of linerboard process was obtained by centrifugation, and their characteristics were analyzed along with their effects on the mechanical properties of linerboard. Micro inorganic materials had little influence on tensile index and ZDT of UKP sheets. They showed rather a positive effect on mechanical properties of KOCC sheets due to adsorbed polymer. Mechanical properties of KOCC sheets decreased remarkably when the concentration of dissolved materials increased especially above 4000 ppm.