• 펄프종이기술
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• 제41권5호
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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.

• 한국펄프종이공학회:학술대회논문집
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• 한국펄프종이공학회 2006년도 PAN PACIFIC CONFERENCE vol.1
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• pp.129-136
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• 2006

Although cleaner and cheaper deinking of ONP could be performed at the neutral or low alkaline condition excessive loss from froth-flotation is unavoidable and so reduction of alkali or caustic soda dosage sacrifices recycling yield. Now the new trade-off regarding alkali dosage versus flotation yield is urgently required in order to set the optimized neutral or low alkaline deinking process of ONP. Lipase from Thermomyces Lanuginosus has an effect on desizing and deacetylation reaction and it could be applied to the stock of pre flotation secondary stage in order to reduce the flotation reject without the sacrifice of optical properties of flotation accepts. Instead of inorganic base, lipase could be applied as a biochemical catalyst for the selective modification of valuable hydrophobic particles in deinking stock, for example cellulose fines and inorganic fillers covered by hydrophobic additives or contaminants. When the enzymatic hydrolysis of ester bond could be made on the surface of hydrophobic particulates, unwanted float of fine particles could be prevented. Now the enhancement of flotation selectivity or the modification of the hydrophobicity of deinking stock is expected to be promoted by the enzymatic pre treatment. And the reduction of recycling cost with the saves of raw material, recovered paper would be possible as a result.

• 한국펄프종이공학회:학술대회논문집
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• 한국펄프종이공학회 2006년도 PAN PACIFIC CONFERENCE vol.2
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• pp.451-454
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• 2006

This paper presents an overview of ONP deinking efficiency with cellulolytic enzymes and synthetic collector in alkaline pH. Deinking is a series of unit operations designed to detach ink from cellulose fibers and separate the dispersed ink from the pulp slurry. Deinking chemicals are process aids that enable expensive mill equipment used in these unit operations to operate more efficiently - often much more efficiently. We propose the blended deinking agent with cellulolutic enzymes and synthetic collector in deinking pulp of conventional alkaline method. The deinking efficiency of old news print in alkaline pH was enhanced with enzyme treatments. The brightness of deinked pulp was increased with less residual ink particles and yield of enzymatic deinked pulp was improved compared to the deinked pulp of conventional alkaline method.

• 한국펄프종이공학회:학술대회논문집
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• 한국펄프종이공학회 2006년도 춘계학술발표논문집
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• pp.167-173
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• 2006

Deinking is a series of unit operations designed to detach ink from cellulose fibers and separate the dispersed ink from the pulp slurry. Deinking chemicals are process aids that enable expensive mill equipment used in these unit operations to operate more efficiently - often much more efficiently. We propose the blended deinking agent with cellulolutic enzymes and synthetic collector in deinking pulp of conventional alkaline method. The deinking efficiency of old news print in alkaline pH was enhanced with enzyme treatments. The brightness of deinked pulp was increased with less residual ink particles and yield of enzymatic deinked pulp was improved compared to the deinked pulp of conventional alkaline method. Enzymes in biomass were use to Chemical Deinking for reduce environment pollution through surfactant and improve surfactants. examining into compatibility Enzymes and surfactants, these new materials are studied efficiency of deinking efficiency.

• 펄프종이기술
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• 제37권1호
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• pp.47-52
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• 2005

Enzymatic pulping properties of mixed office waste paper in standard disintegrator were investigated for successful enzymatic deinking of mixed office waste paper. Enzymatic pulping need more revolution in standard disintegrator than alkaline pulping and Cellusoft need more revolution than Denimax. The freeness of disintegrated pulp with enzyme was higher than those of disintegrated pulps with alkaline and heat killed enzyme. The freeness of disintegrated pulp with Denimax was higher than that of disintegrated pulp with Cellusoft. The freeness of disintegrated pulps were increased with a dosage of enzymes. The mechanical properties of disintegrated pulp were improved with enzyme addition comparing with heat killed enzyme. The tensile and burst index of hand sheet of disintegrated pulps with acidic Cellusoft were higher than that of others.

• 펄프종이기술
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• 제37권1호
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• pp.38-46
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• 2005

This study was focused on the optimum culture condition in CMCase, FPase and xylanase activities of two fungal strains that secret extracellular enzymes for using enzymatic deinking agent to old newsprint. The results of this study were as follows. When Fusarium pallidoroseum was grown on the medium, containing of rice bran+xylan $2.0\%,\;peptone\;0.6\%,\;KH_2PO_4\;0.075\%\;and\;MnSO_4\;0.06\%\;with\;pH\;9.0,\;at\;29^{\circ}C$ for 6 days, the quantitative degree of extracellular enzyme production was the highest. Optimum culture condition for Aspergillus niger was pH 5.0, $27^{\circ}C$ incubating temperature and 7 days incubation period on liquid medium, containing of CMC+xylan $2.5\%,\;yeast\;extract\;0.4\%,\;K_3PO_4\;0.05\%\;and\;CaCl_2+FeSO_4\;0.08\%$. Aspergillus niger was fairly higher FPase and xylanase activities than Trichoderma reesei ATCC 28217.

• 펄프종이기술
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• 제37권1호
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• pp.53-60
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• 2005

The mechanical properties of deinked mixed office waste paper in relation to sorts and dosage of enzymes were investigated for successful enzymatic deinking of mixed office waste paper. The increasing of $\Delta$. freeness was most predominant in pulp of Denimax treated pulp. The tensile and burst properties are decreased with enzyme dosage while $\Delta$. freeness were increased. The fine content in disintegrated pulp was decreased with enzyme dosage of $0.4\%$ on the dried weight of paper. The water absorption of handsheets of enzyme deinked pulp was like as that of market roll tissue papers and the mechanical properties of handsheets of enzyme deinked pulp were improved with enzyme treatment comparing of market roll tissue papers.

• 펄프종이기술
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• 제37권1호
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• pp.25-37
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• 2005

This study was carried out to examine the optimal cultural condition in enzyme activities of CMCase, FPase and xylanase in selected strains which secret extracellular enzymes for using deinking agent to old newsprint. The results of this study were as follow: The production of enzyme by Bacillus pumilus I was maximal as grown on the medium, containing of rice bran+xylan $2.0\%$, peptone $0.8\%,\;K_2HPO_4\;0.1\%\;and\;CaCl_2\;0.06\%$ at pH 8.0 and $28^{\circ}C$ for 72 hours. Optimal cultural condition of B. subtilis I was avicel+xylan $3.5\%,\;urea\;0.4\%,\;K_3PO_4\;0.1\%\;and\;CaCl_2\;0.015\%$ at pH 9.0 and $28^{\circ}C$ for 36 hours. The maximal enzyme production was observed in the medium, containing of avicel+xylan $3.5\%,\;urea\;1.6\%\;and\; K_2HPO_4\;0.125\%$ with pH 9.0 when B. pumilus II was cultured at $28^{\circ}C$ for 60 hours. The production of enzyme by B. subtilis IT was maximal as grown on the medium, containing of xylan $2.0\%,\;yeast\; extract\;0.6\%,\;K_2HPO_4\;0.1\%\;and\;ZnSO_4\;0.04\%$ at pH 8.0 and $34^{\circ}C$ for 36 hours. The activities of FPase and xylanase in tested 4 strains were not much different with Thermomonospora fusca.

• 한국미생물·생명공학회지
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• 제20권5호
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• pp.527-533
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• 1992

효모탈묵용 cellulase와 xylanase 생산을 위한 조건을 조사한 결과 배지초기 pH, Tween 80, 포자접종량, 질소원의 종류 및 탄소원의 종류에 따라 효소 생산량이 크게 변하였다. Cellulase 생산을 위한 최적조건으로는 pH5.0-6.5, Tween 80 0.02, 포자현탄액($1{\times}10^{7}$/ml) 접종량 0.5-1.0, 질소원으로 면실박, 탄소원으로 옥분을 사용하였을 때 가장 효과적 이었다. 또한, xylanase 생산을 위한 최적조건으로는 pH6.5, Tween 80 0.01%, 질소원으로 corn steep liquor, 탄소원으로는 신문고지를 사용하였을 때 효과적이었으며, 이때 포자현탁액의 접종량은 cellulase 생산의 경우와 동일하였다.한편, cellulasedhk xylanase의 동시생산을 위해서는 플라스크 규모에서 질소원으로 면실박 0.5%, 탄소원으로 신문고지 1.0%와 옥분 2.0%를 첨가하였을 때 효과적이었으며, 이때 생상된 배양약의 cellulase의활성은 6.11~7.22IU/ml, xylanase의 활성은 97.7IU/ml이었다. 그러나 fermentor 규모에서는 동일 배지조성에서 효소생산이 다소 감소하였으며, 특히 xylanase 경우 배양액의 효소활성이 낮아서 이에 대한 보완이 요구된다.

• 한국펄프종이공학회:학술대회논문집
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• 한국펄프종이공학회 2000년도 춘계학술발표논문집
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• pp.39-46
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• 2000

In pulp and papermaking process, enzymatic treatment of pulp fibres has been a topic of increasing interest in last decade. Lots of patents, papers and research reports were published on the application of enzymes in the fields of enzymatic bleaching, deinking, slime control, pitch control, waste water treatment and fibre modification. Cellulase and hemicellulase are the principal enzymes used for the modification of fibre property. This study was carried out for determinating the behaviors of enzyme to pulp fibres. A commercial enzyme, Denimax BT which is consisted with cellulase and hemicellulase, was treated to the kraft pulp produced from domestic hardwood mixtures. Results were mainly concentrated on the behaviors of freeness, drainability and fines content of fibres, and physical properties of paper with enzyme treatment. The freeness levels and dewatering ability were developed, and the fines contents were decreased. The creation of fines were controlled by the method of pre-enzyme treatment prior to fibre beating. The mechanical strength of paper, like tensile, burst, tear strength and folding endurance, were remarkably improved by the pre-enzyme treatment.