• 한국생물공학회:학술대회논문집
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• 한국생물공학회 2000년도 추계학술발표대회 및 bio-venture fair
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• pp.504-507
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• 2000

Enzymatic hydrolysis of cellulose was studied with emphasis on the effect of cellulase loading and pulp sludge concentration on glucose yield. Enzyme loading appeared to have a significant effect on glucose yield. Chemical pretreatment had no effect on enzymatic hydrolysis of pulp sludge. High glucose yield was obtained from enzymatic hydrolysis, especially at sludge concentrations lower than twenty percent. The optimum concentrations of crude cellulase and ${\beta}-glucosidase$ were 5 U/mL and 8 U/mL, respectively, considering the amount of enzymes used and glucose produced.

• 펄프종이기술
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• 제41권4호
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• pp.43-51
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• 2009

Paper mill sludges are discharged around 870,000 M/T annually. Only 30% of the paper mill sludge have been recycled and the rest has been disposed by land fill, incineration, ocean abandonment and other ways. Because of overall prohibition of sludge disposal by London Dumping Convention in 2012, a urgent counter measure for paper mill sludge must be provided. In this paper, some basic experiments were carried out to develop a tray cell pot using paper mill sludge for increasing the recycling potential of the wasted sludge. To establish the manufacturing parameters, the tray cell pots were made with three types of materials including virgin pulp, old news paper and corrugated board mixed in a blend tank of a molding machine. The bending force and moisture content of the produced tray cell pots was measured to confirm the application capability. The tray cell pot could be manufactured under the condition of over 20% of virgin pulp, 40% of old news paper added. However, the corrugated board could not be used because of the glutinous substance included. The produced tray cell pot absorbed water very easily and the bending force decreased rapidly. The waterproof material must be used to applicate the produced tray cell pot in plant growing fields.

• 한국지반환경공학회 논문집
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• 제4권4호
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• pp.35-43
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• 2003

폐기물로 발생하는 제지슬러지 소각재와 하수슬러지 소각재의 재활용을 위하여 각 소각재의 물리 화학적인 특성을 조사하였으며 소각재가 가지는 포졸란 반응특성을 이용하여 시멘트 혼화재로서 활용가능성에 대하여 검토하였다. 제지 및 하수슬러지 소각재의 입도는 $10{\sim}100{\mu}$에 대부분 분포하고 있으며, 포졸란 반응물질인 $SiO_2$와 $Al_2O_3$의 함량이 45.8~51.0%이였다. 압축강도시험결과 소각재 함량이 10%일 때 비교적 높은 압축강도를 나타났으며 기공율 또한 하수슬러지 소각재를 제외하고 10%일 때 낮은 것으로 나타났다. 이 결과 제지슬러지 소각재의 경우 시멘트 혼화재로써의 재활용 가능성이 충분한 것으로 판단된다.

• 환경위생공학
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• 제12권2호
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• pp.23-28
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• 1997

This study was conducted to know the possibility of reducing lime dosage by recycling sludge from bleaching wastewater lime coagulation settlement treatment at pulp mill process. In case of bleaching wastewater at the pulp mill process, when the lime dosage was increased, the removal efficiency of TSS(Total Suspended Solids) was increased, proportionally, but the organic removal efficiency was increased very slowly. It was concluded that sludge recycling at the lime coagulation settlement process was effective method to reduce the requirement of lime dosage. At the lime coagulation settlement process with sludge recycling, when the recycling number was increased, the organic removal efficiency was decreased, sharply. It was evaluated that the pH could be the basic standard for lime supplement by sludge recycling.

• 펄프종이기술
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• 제36권1호
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• pp.43-48
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• 2004

This paper suggests of utilizing both optimum coagulating and drainage conditions on mills to reduce the costs for sludge treatment of papermaking and transportation as well as leading to an effective treatment. It showed that CST method was much more effective than the time-consuming SRF since it compensated the demerits of the conventional drainage measuring method.

• 펄프종이기술
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• 제46권4호
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• pp.85-92
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• 2014

The disposal of the paper mill sludge and the paper mill sludge ash become more important issue, because the environment regulation becomes more strict. In this study, the new mulching system was developed by using the paper sludge ash. The soil surface hardening mechanism for mulching with paper sludge ash, red clay and coal ash was evaluated. Since the CaO in the paper sludge ash provided the harden structure with water, the surface hardening mulching structure could cover the field surface and prevent the germination of weeds. More than 50 w.t.% of red clay and 10 w.t.% of paper sludge ash were required to create the solid soil surface structure for mulching. The field test with the new soil surface hardening mulching system for three months showed the generation of weeds could successfully be inhibited by the system.

• 펄프종이기술
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• 제36권4호
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• pp.77-82
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• 2004

Expression-deliquoring tests using three types of paper sludges (tissue, newsprint, and paperboard) as deliquoring agent were carried out in order to investigate the effects of sludge dosage and pressure on the expression-deliquoring of slurry. The addition of deli­quoring agent causes expression-deliquoring of slurry to be faster than would be the case without the deliquoring agent. In case of the tissue sludge, the highest compression rate was achieved when $5\%$ of deliquoring agent was added, while in cases of the news­print and the paperboard sludge, $7\%$. Compression rate was increased as pressure increases. Porosity was decreased as pressure increases. The lowest porosity was observed when $5\%$ of tissue sludge was added. When compared the weight of cake where deliquoring agent was not added and the weight of cake that was fastest expression-deliquoring, there was about $17.5\%$ of the weight reduction

• 펄프종이기술
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• 제29권2호
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• pp.51-59
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• 1997

• 펄프종이기술
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• 제42권1호
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• pp.1-6
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• 2010

Paper industry in Korea produces 14 million tons of paper and 1.3 million tons of sludge per year. Most of them has been treated by incineration, landfilling or ocean dumping. The sludge recycling to minimize the impact on the environment, so its importance is highlighted. In this study, in order to develop a new way of recycling the sludge, it was calcined and the recycled ash was tried to use as papermaking filler. Concerning the yield of calcium carbonate and the brightness and the rheology of the recycled calcination sludge, the optimum calcination conditions were found to be $600^{\circ}C$ and 12 hours. The sludge ash itself was not suitable for papermaking due to its color and low brightness. Thus the ash from the sludge was first mixed with a commercial filler and then utilized for papermaking. The effect of the increased hardness after high temperature treatment on wire abrasion was confirmed.

• 펄프종이기술
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• 제42권5호
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• pp.47-53
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• 2010

It is important to utilize the citrus sludge in terms of the reuse of waste materials in the manufacture of corrugated medium. Especially, the mandarin industry occupies the first place in Jeju province. In this paper, the application of citrus sludge mixed with KOCC recycled fibers into the manufacture of corrugated medium was studied. The citrus sludge was acidic in pH value. Also, the constituents of citrus sludge contain some short fibers, fines, and mucus which contain flavonoids, pectins and so on. In papermaking application, these components cause some troubles like foams, bad smell, fouling on the paper machine, and bad drainage and web breaks of wet web. The strength properties of handsheets prepared from KOCC and citrus sludge was decreased, compare to handsheets made of only KOCC. To compensate the problems on strength properties, some kinds of additives were tried to apply into papermaking wet-end system in laboratory scale. As a result, mixing conditions of alum, starch and anionic additives showed the best options in the recovery of strength properties and formations of corrugated medium.