• 생태와환경
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• 제38권2호통권112호
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• pp.217-224
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• 2005

본 연구는 4년에 걸쳐 조사된 팔당호 식물플랑크톤 조사자료를 토대로 각 분류군별 세포수 및 점유율 그리고 우점 조류속의 장기변동 패턴을 평가하고, 아울러 이들과 수질과의 관계를 규명해보고자 시도되었다. 규조류는 조사기간 중 비교적 지속적으로 출현하는 경향을 보였으며, 남조류는 매년 6 ${\sim}$ 9월에 집중적으로 발생하는 특징을 보였고 7월경 가장 높은 세포수를 나타냈다. 녹조류의 경우 높은 세포수를 나타내는 시기는 6 ${\sim}$ 8월로서 남조류의 경우와 유사하였다. 기타 조류는 Cryptomonas속이 거의 대부분을 차지하였으며, 5 ${\sim}$ 8월에 높은 세포수가 관찰되었다. 조사기간 중 우점속 (매년 조사기간 중 출현 세포수 총계가 평균 7,000 cells $mL^{-1}$ 이상인 것을 대상으로 함)은 Aulacoseira 및 Cyclotella속(규조류), Microcystis와 Anabaena속 (남조류), Scenedesmus속 (녹조류) 그리고 Cryptomonas속 (은편모조류) 이었다. 각 분류군별 세포수와 수질조사 자료 간의 상관관계는 낮은 수준을 보였으며, 유의성이 있는 것 (p<0.05)으로 나타난 항목 중 상관계수 0.3 이상을 나타낸 분류군은 규조류의 경우 수온과 총인, 남조류는 수온, pH, DO포화도, COD, 총인, 녹조류는 수온, pH, DO포화도, COD, SS, 총인이었다. 속(genera)별 상관계수 0.3 이상을 나타낸 것은 Aulacoseira속의 경우 총질소와 총인, Anabaena속은 수온, DO포화도, COD, 총인, Microcystis속은 수온, pH, DO포화도, 총인, Coelastrum속은 COD와 SS, Scenedesmus속은 수온, COD, 총질소, 총인, Cryptomonas속은 DO포화도와 총질소였다. 팔당호에서의 남조류 bloom에는 유입량에 의한 1차적인 영향을 제외하면, 수온조건이 인 농도 증가에 의한 영향보다 더 크게 작용한 것으로 사료되었다.

• ALGAE
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• 제22권3호
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• pp.185-192
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• 2007

A study was carried out in nine fertilized fish ponds under three treatments (T-I, T-II and T-III) at Bangladesh Agricultural University, Mymensingh to see the bloom of euglenophytes with the intention of observing its impact on the growth of fish in culture condition. Some water quality parameters viz., temperature, dissolved oxygen, pH, PO4-P and NO3-N concentration and some biological parameters viz., phytoplankton population and growth of fish were monitored at fixed intervals. Euglenophytes showed a heavy bloom in late August in the ponds of T-II. The bloom was occurred by the genera, Euglena, Phacus and Trachelomonas of which Euglena was the most dominant genus. In relation of water quality parameters with euglenophytes bloom, it was hypothesized that euglenophytes prefers higher temperature and acidic environment with higher nutrient concentrations. Acidic environment and nutrient enrichment enhanced the bloom of euglenophytes which hampered the growth of other beneficial algal groups (chlorophytes and bacillariophytes) and fish. Due to heavy bloom, the fishes breathed with difficulty at the surface. The fishes in the heavy bloom ponds presented the weight values were lower than verified for those in the ponds where the bloom did not occur. Total production (calculated) of fish in different treatments ranged from 1355.89 to1760.63 kg ha–1 with significantly (p < 0.05) lowest in the ponds of T-II.

• 환경생물
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• 제19권2호
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• pp.129-135
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• 2001

부영양화된 연못에서 규산질다공체(CelICaSi)와 미생물응집제를 이용한 녹조제어의 효과를 조사하였다. 녹조 발생 남조류인 Microcystis aeruginosa에 대한 응집능이 우수한 S-2 균주가 생산한 미생물응집제를 선정하여 현장의 조류응집에 적용하였다. 초기의 인산염농도는 대조구에서 $131\mu{g}\ell^{-1}$를 기록하였음에 비해서, CelICaSi가 첨가된 3개의 처리구에서는 $1-14\mu{g}\ell^{-1}$를 기록하며 크게 감소하였다. 엽록소$-\alpha$ 농도는 현장에 설치한 en-closure에서 초기에 $215\mu{g}\ell^{-1}$ 이었으나 CellCaSi $(1g\ell^{-1}$, 미생물응집제 $(2ml\ell^{-1})$, 보조응집제 $(1g\ell^{-1})$, 염화제이철 $(2mg\;Fe\ell^{-1})$을 함께 처리한 처리구에서 $59\mu{g}\ell^{-1}$로 가장 많이 감소하였다. 실험용 쥐 및 금붕어를 이용한 독성실험에서 녹조제거에 이용되는 성분들과 미생물응집제에 대한 독성은 없는 것으로 조사되었다. 따라서, CellCaSi와 미생물응집제는 인 제거 및 엽록소-$\alpha$ 농도 감소에 의한 녹조제거에 효과적인 것으로 판단되었다.

• 상하수도학회지
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• 제18권4호
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• pp.445-452
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• 2004

Intermittent deep draw artificial circulation system is one of the most widely used destratification systems to control algal bloom in reservoirs in Korea. However, there have been neither theoretical background of design criteria nor operation guide line for efficient application of the system available for such systems. A design method was developed to calculate required compressor capacity and number of circulation units considering physical interactions between stratified water layers and plumes induced by the intermittent deep draw artificial circulation system. The program was tested with data observed in Yeoncho Lake. The results indicated that the developed method can applied in the fields successfully. Further validation processes would improve design and operation methods.

• 환경영향평가
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• 제16권1호
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• pp.15-26
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• 2007

Surface water is the main drinking water source in Korea. Algal bloom caused by phytoplankton in reservoir is common event in every summer season. To prevent or control the algal blooms, artificial circulation system has been adopted in many reservoirs, including Hoengseung reservoir. Total 7 hydraulic-gun-aerators were installed around the intake tower in Hoengseung reservoir since 2000. This study is to elucidate the effects of hydraulic-gun-aerators on phytoplankton bloom, pH, DO, temperature and evaluate the selective withdrawal and vertical distribution of phytoplankton by means of submersible fluorescence probe, which features high correlation with a standard ISO method (r=0.90, P<0.0001) for chlorophyll-a quantification.

• 한국습지학회지
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• 제7권3호
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• pp.49-55
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• 2005

분말 형태의 조류생성 방지제를 담체형으로 제형화(劑形化)하는 연구를 수행하여 높은 기공율 및 내구성을 가진 담체를 개발하였다. 조류생성 방지 기능이 있는 담체는 처리대상 물질과 담체내의 유효성분과의 유효 접촉시간을 향상시킴으로써 조류생성 방지를 위한 약품 투입량을 줄이고 슬러지 발생량을 저감시키는 효과가 있음을 확인할 수 있었다.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2005년도 Proceedings of ISRS 2005
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• pp.249-252
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• 2005

Microphytobenthos bloom from late January to early March in Korean tidal flats. KOMPSAT-2 will provide multi-spectral images with a spatial resolution of 4 m comparable with IKONOS. Using IKONOS and Landsat data, algal mat detection was tested in the Saemangeum area~ Micro-benthic diatoms are abundant and a major primary product in the tidal flats. A linear spectral unmixing (LSU) method was applied to the test data. LSU was effective to detect algal mat and the classified algal mat fraction well correlated with NDVI image. Fine grained upper tidal flats are generally known to be the best environment for algal mat. Algal mat thriving in coarse grained lower tidal flats as well as upper tidal flats were reported in this study. A high resolution multi-spectral sensor in KOMPSAT-2 will provide useful data for long-term monitoring of microphytobenthos in tidal flats.

• Membrane and Water Treatment
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• 제9권6호
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• pp.447-454
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• 2018

Although flotation techniques are often used for the removal of algal particles, the practicality of algae-harvesting technologies is limited owing to the complex and expensive facilities and equipment required for chemical coagulation. Here, we examined the feasibility of an approach to separating algal particles from water bodies without the need for chemical coagulants, depending on the condition of the algae, and to determine the optimal conditions. Using Anabaena sp., a cyanobacterium causes algal blooms in lakes, we stimulated auto-flocculation in algal particles without coagulants and conducted solid-liquid separation experiments of algal particles under various conditions. The six cultivation columns included in our analysis comprised four factors: Water temperature, light intensity, nutrients, and carbon source; auto-flocculation was induced under all treatments, with the exception of the treatment involving no limits to all factors, and algal particles were well-settled under all conditions for which auto-flocculation occurred. Meanwhile, flotation removal of auto-flocculated algal particles was attained only when nutrients were blocked after algae were grown in an optimal medium. However, no significant differences were detected between the functional groups of the extracellular polymeric substances (EPSs) of floated and settled algal particles in the FT-IR peak, which can cause attachment by collision with micro-bubbles.

• 한국환경과학회지
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• 제9권3호
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• pp.267-273
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• 2000

In order to understand the impact for decomposition of blue-green algae Microcystis on water quality, the algae were cultivated with collection of natural population during approximately one month, when water-bloom of Microcystis dominated at August 31, 1999 in the lower part of the Okchon Stream. The enrichment of inorganic NㆍP nutrients didn't in algal assay and the effect of Microcystis on water duality was assessed from the variation of nutrients by algal senescence. Microcystis population seemed to play a temporary role of sink for nutrients in the water body. Initial algal density of Microcystis was 2.3×10/sup 6/ cells/㎖. When Microcystis population died out under light condition, algal NㆍP nutrients between 9∼12 days affected to increase of biomass after reuse by other algal growth as soon as release to the ambient water. However, cellular nutrients under dark condition were almost moved into the water during algal cultivation. NH₄, NO₃ and SRP concentration were highly increased with 160, 17 and 79 folds, respectively relative to the early. As a result, the senescence of Microcystis population seemed to be an important biological factor in which cause more eutrophy and increase of explosive algal development by a lot of nutrients transfer to water body. There are significantly observed an effort of reduce for production of inner organic matters such a phytoplankton as well as load pollutants from watershed in side of the water quality management of reservoir.

• 생태와환경
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• 제37권1호통권106호
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• pp.64-69
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• 2004

부영양호수의 남조 Microcystis aeruginosa 제어를 위해 호수 바닥층에서 분리한 살조세균과 섬모충을 현장여과수를 이용하여 조류배양조건과 동일한 조건에서 단일 또는 혼합적용하여 그 결과를 서로 비교하였다. 두 생물제재는 저자들의 선행연구와 같이 단일 적용시 매우효과적인 반면, 혼합적용시 오히려 조류의 성장을 촉진하였다. 결국 남조 Microcystis제어를 위한 섬모충이나 박테리아의 적용은 다른 한 생물군의 낮은 밀도를 요구하였으며, 이처럼 동일 조류에 대한 제어능을 갖는 두 생물제재의 배타적인 관계는 앞으로 부영양호수의 남조대발생 제어에 귀중한 자료로서 제공될 것이다.