• 폴리머
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• 제26권4호
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• pp.516-522
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• 2002

4급 암모늄기를 관능기로 갖는 아민화 아크릴계 이온교환섬유를 이용하여 연속식 흡착공정 중 linear alkylbenzene sulfonate(LAS)의 흡착특성을 확인하였다. 아민화 아크릴계 이온교환섬유의 LAS흡착성능은 온도가 증가함에 따라 증가하였으며 $40^{\circ}C$에서 최적 흡착성능을 나타내었다. 또한 컬럼 베드 충진비(L/D)의 변화에 따른 LAS 이온의 흡착능은 L/D>2에서 최대 흡착능을 나타내었다. pH 변화에 따른 LAS이온 흡착능은 pH가 증가함에 따라 증가하는 경향을 나타내었고, pH 7에서 최대 흡착능을 나타내었다. 유속변화에 따른 LAS 흡착능은 유속이 증가할수록 낮아졌으며 농도가 높을수록 떨어졌다.

• 한국수소및신에너지학회논문집
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• 제27권5호
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• pp.510-516
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• 2016

This study examines the effects of linear alkylbenzene sulfonate on hydrogen fermentation of food waste. The hydrogen production rate was similar with different linear alkylbenzen sulfonate (LAS) concentrations. The maximum hydrogen yield increased with increasing LAS concentration. The highest maximum hydrogen yield was $0.550{\pm}0.005mol$ H2/mol hexose at LAS for 5.52 mg/L. But the maximum hydrogen yield decreased above LAS for 11.05 mg/L. The concentration of acetate in control reactor was increased, but it decreased with increasing LAS concentration in other reactors.

• 한국미생물·생명공학회지
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• 제22권2호
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• pp.158-163
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• 1994

Microorganisms capale of utilizing linear alkylbenzene sulfonates(LAS) as sole carbon source were isolated from industrial effluent by using LAS agar plates. The isolated strains were identified as Salmonella sp(BC-2) and Escherichia sp.(BC-3) from the results of morphological, cultural and biochemical tests. The optimal condition for the growth and biodegradation of LAS was the initial pH 7.0 and LAS concentration 0.1%. The isolated BC-2 and BC-3 strains harbored plasmid and LAS-degrading activity was lost when the plasmids were cured by mitomycin C. The plasmids were transformed into E. coli and transformants have the LAS-degrading activity. Isolated strains were examined for primary biodegradation rate of LAS in the medium by methylene blueactive substance(MBAS) method. Of these isolates, BC-2 and BC-3 strains degradated LAS upto 60% and high resistant to CdCl$_{2}$ and HgCl$_{2}$. Isolated strains were sensitive to chloramphenicol, kanamycin, rifampicin, streptomycin and tetracycline but resistant to ampicillin and lincomycin.] Its minimal inhibitory concentration(MIC) for ampicillin was more than 1500 $\mu $g/ml.

• 한국응용과학기술학회지
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• 제9권1호
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• pp.31-40
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• 1992

This study is on the biodegradability of the activated sludge, which used to biodegrade Linear Alkylbenzene Sulfonate(LAS), synthetic detergents and sufactants. The activated sludge in waste water treatment plant is used to the test of biodegradation of anionic surfactants and nonionic surfactants, but it have the periodic change of the biological propety to the lapse of the time. For the puropse of controlling and adjusting of the activated sludge in biodegradation test, we collected microorganisms from the sewage plant and the soil, and then, made the activated sludge in semicontinuous aeration chamber. From determined biodegradation data, and the degree of biodegradability to the LAS, we confirmd the standardized synthetic activated sludge which have more stable biodegradability than the sewage activated sludge. In continuous biodegradation test, LAS(dodecene-1) was biodegraded more than 99%, In 7days by the standardized activated sludge.

• 농업과학연구
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• 제21권1호
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• pp.60-66
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• 1994

하수 및 토양시료로부터 다수의 LAS분해세균을 분리하고 고농도 (LAS 200ppm)의 액체 배지에서 생육하면서 분해력이 높은 KL-3, SH-2, EN-1등 3개 균주를 선발하였다. 이들의 형태적, 생리적 및 배양적 성질에 따라 KL-3은 Klebsiella속, SH-2는 Shigella속, EN-1은 Enterobacter속 균주로 각각 동정되었다. 실험실용 발효조에서의 LAS의 분해양상은 배양초기에 분해속도가 빠르고 (1 일후의 분해율: KL-3 및 SH-2, 50%; EN-1, 20%), 배양 1-2일사이에서 그 속도가 크게 지연되다가 다시 분해가 빠르게 진행되며 3, 4일후에는 다시 늦어지는 경향을 나타내었다 (7일후의 분해율: KL-3, 85%; SH-2, 82%; EN-1, 75%). 균체의 생육은 배양 2일 후에 $10^8cfu/mL$수준의 정지기에 도달하였으며 pH는 최초 7.0에서 6.2~6.7의 범위로 저하되어 서서히 변화하는 경향이었다. 균체에 의한 LAS의 흡착량은 Shigella sp. SH-2균주의 경우가 가장 많았으며 Freund1ich흡착등식 Y= 0.030X + 0.95를 나타내었다.

• 한국응용과학기술학회지
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• 제9권2호
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• pp.165-174
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• 1992

The standardized activated sludge for the biodegradation test of anion surfactants has been produced from the collected microorganisms in the soil and the wastewaters treatment plant. The activated sludge was kept under control of the pH, dissolved oxygen, microorganisms and inoculated the basal medium flasks with LAS and LAS mixed with heavy metals [Cd(II), Cu(II), Zn(II)]. Based of results, the inhibition effect(%) of heavy metals in LAS biodegradation were 1. All 1% when LAS 30mg/l-Cd(II), Cu(II) and Zn(II) 0.1mg/l, respectively 2. All 1${\sim}$10% when LAS 30mg/l-Cd(II), Cu(II) and Zn(II) 1mg/l, respectively 3. All 10${\sim}$40% when LAS 30mg/l-Cd(II), Cu(II) and Zn(II) 10mg/l, respectively 4. All 30${\sim}$65% when LAS 30mg/l-Cd(II), Cu(II) and Zn(II) 100mg/l, respectively And toxicity order of heavy metals to the microorganisms in LAS biodegradation were Cd>Cu>Zn in low concentration(0.1${\sim}$1mg/l)and Cd>Zn>Cu in high concentration(10${\sim}$100mg/l).

• 한국환경보건학회지
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• 제21권4호
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• pp.37-43
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• 1995

The course of biodegradation of anionic surfactants, Linear Alkylbenzene Sulfonates(LAS), Sodium Lauryl Ethoxylate Sulfonate(SLES), and Sodium Lauryl Sulfonates(SLS), which are mainly used to make detergents and shampoo, was investigated. The degree of biodegradation was studied as a function of concentration, volumetric flow rate, and temperature in Naktong River. MethyleneBlue Active Substances(MBAS), Total Dissolved Organic Carbon(TOC), and Chemical Oxygen Demand(COD) were measured to evaluate the degree of biodegradation. The degree of biodegradation of LAS was highly dependent upon the concentration and was increased as the concentration was decreased and that of SLES and SLS was almost constant at the concentration of less than 200 ppm, but was much increased as the volumetric flow rate was increased or the temperature was increased.

• 분석과학
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• 제5권2호
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• pp.159-167
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• 1992

하천수 중 LAS의 각 동족체 및 이성체들의 성분을 BP-5 capillary column을 이용한 GC 및 GC/MS에 의하여 분리 확인 및 정량하였다. 특히 LAS 유도체의 mass chromatogram에 의해 RIC에서는 분리가 되지 않는 $5-C_{11}$과 $6-C_{11}$ 및 $2-C_{12}$, $6-C_{13}$과 $7-C_{13}$의 LAS 성분을 각각 분리 확인하였다. 중랑천, 진위천 및 한강 하루부에서 채수한 시료 중에서 탄소수 $C_{10}$, $C_{11}$, $C_{12}$ 및 $C_{13}$의 LAS 성분을 측정하였으며 동족체 및 이성체의 조성비를 구하였다. 표준품과 하천수 중 LAS 성분의 함량비를 측정 비교함으로써 하천에서 LAS의 생분해 및 동태를 추정할 수 있었다.

• 한국환경과학회지
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• 제11권7호
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• pp.757-763
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• 2002

The objective of this study is to delineate removal efficiency of the Linear alkylbenzene sulfonates(LAS) in solution by $TiO_2$ photocatalytic oxidation as a function of the following different experimental conditions : initial concentration of LAS, $TiO_2$ concentration, UV wavelength and pH of the solution. It was increased with decreasing initial concentration of LAS and with decreasing pH of the solution. Removal efficiency increased with increasing $TiO_2$ concentration but was almost the same at $TiO_2$ concentration of 2 g/L and 3 g/L, i.e., for initial LAS concentration of 50 mg/L. It was removal efficiency was 85% at 150 min in the case of $TiO_2$ concentration of 0.5 g/L but 100% after 150 min in the case of $TiO_2$ concentration of 1 g/L, 100% after 110 min in the case of $TiO_2$ concentration of 2 g/L and 3 g/L. UV wavelength affection on the removal efficiency of LAS decreased in the order of 254, 312 and 365 nm as increasing wavelength. But the removal efficiency of LAS was nearly the same at UV wavelength of 254 nm and 312 nm.

• 분석과학
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• 제11권2호
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• pp.105-111
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• 1998

현재 국내에서 시판 중인 샴푸와 의류용 분말세제 중 대표적인 제품(샴푸6종, 의류용 분말세제 6종)을 대상으로 계면활성제의 생분해도를 측정하고, 부영양화의 원인이 되는 인산염의 함유 여부와 인체에도 직접적인 영향을 미치는 중금속(Pb, Cd, As 및 Hg)을 분석하였다. 분석결과 샴푸와 의류용 분말세제 시료 전제품이 KS규격에 모두 적합하였다. 그러나 sodium ${\alpha}$-olefin sulfonate(AOS), linear alkylbenzene sulfonate(LAS) 및 합성 sodium lauryl etoxylate sulfonate(SLES) 성분이 상대적으로 다량 포함되어 있는 제품의 생분해도가 느리다는 것을 알 수 있었으며, 이들 계면활성제가 석유계라는 사실로부터 천연 추출 계면활성제보다 생분해도가 낮다는 것을 알 수 있었다. 인산염과 중금속 함유량은 모두 화장품기준에 적합한 우수한 제품인 것을 확인할 수 있었다.