• 청정기술
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• 제16권1호
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• pp.39-45
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• 2010

본 연구에서는 국내 우리텍사의 PVDF계 중공사 막을 4 bundle 씩 묶어 모듈을 제작하였으며, 처리용량은 10 ton/day로 설정하여 반응조 내 부유고형물(suspended solid; SS) 의 농도구배가 없도록 하부로부터 간헐 폭기하는 방식을 선택하여 부산 수영하수처리장에 pilot plant를 설치하였다. Pilot plant는 정상 운전을 위하여 하수처리장의 폭기조로부터 유입된 mixed liquor suspended solid (MLSS) 1,000 ppm 정도의 원수를 시험 여과하고, 세척수로 2회 세척, 10% 에탄올 용액으로 1회 세척, 그리고 NaOCl 5% 용액으로 1회 세척 과정을 거치고 마지막으로 세척수로 최종 세척한 후 운전하였다. 결과적으로, 화학세정 후 membrane bioreactor (MBR) 내의 잔류수를 원수로 운전한 결과 SS 제거효율이 99.9% 이상을 보이고 있는 결과와 폭기조 유입수를 원수로 운전하여, 여과 수량은 초기 조건에 비해 16% 감소, suction pressure 는 30% 상승하고 있음을 확인한 결과를 연속 운전 조건으로 설정하였다. 연속 운전한 결과, 유입수 mixed liquor suspended solid (MLSS)가 1,900 mg/L의 조건에서 SS 제거 효율은 99.99% 이었으며 여과수량은 $42{\sim}52L/m^2$ h, suction pressure가 16~20 cmHg로 안정 상태로 운전되고 있음을 확인하였다. 다만, 여과수 저장조의 유출구와 유입구에서의 SS 제거 효율에 영향을 미치는 조류의 발생 억제에 관한 방법이 재고되어 여과수의 재이용 범위를 설정할 필요가 있을 것으로 판단된다.

• 한국해양공학회:학술대회논문집
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• 한국해양공학회 2000년도 추계학술대회 논문집
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• pp.196-203
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• 2000

In this study, the evaluation method of diffusion characteristics of Suspended Soli&SS) and the generation limit(source and thick) are investigated, which is significantly affecting on marine examined by construction works such as dredging and reclamation. Dispersion characteristics of SS is examined by hydraulic tests and numerical works in consideration with the Pusan Port. Hydraulic model test was performed in 2-D wave flume to find the limit wave conditon of re-suspension of solid as well as the time dependent characteristics of settlement The results obtainded in the study are as follows; 1) The quantituative evaluation af SS is the basic parameter of marine environmental impact assessment in related with the port development The SS increases as the water content of sea bed solid increases and the density decreases. 2) The sea bed solid in Sinsundai area, Pusan Port has the water content range of 83~157% 3) The ratio of suspension velocity against settlement velocity is about 0.25 and SS concentration converges as the wave heigh. 4) The SS increases 2 time when time step increases 3 time(10 sec to 30 sec) in numerical simulation It means that the effect of the time step should be checked in detail to stable. The diffusion The diffusion coefficient are Affiected senstively in the dispersion process while sea ved friction coefficinet have not strong relation in the simulated area

• 한국환경과학회지
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• 제12권9호
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• pp.1017-1023
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• 2003

The high speed elimination process of suspended solid was investigated to treat the pulp waste water by using surface modified magnetite particle and magnetic power. The effects of the various aluminum salts such as Al(NO$_3$)$_3$ㆍ9$H_2O$, AlC1$_3$ㆍ6$H_2O$, $Al_2$(SO$_4$)$_3$ㆍ13∼14 on the COD, BOD and suspended solid were systematically studied. It has been found that the 2.0 wt% of Al was most effective for the modification of Fe$_3$O$_4$ powder and then best for the treatment of pulp waste water, Optimum quantity of modified magnetite in this study was 12 wt%, and aging time was found to be 12 hours. Comparing with the conventional process, the required time for SS removal was drastically decreased. BOB and COD were also effectively removed when applied to the pulp wastewater.

• 한국물환경학회지
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• 제26권5호
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• pp.789-795
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• 2010

Suspended Solid (SS) is one of the main pollutants and discharges with attached other pollutants such as heavy metal and toxic substance. It is very important to estimate and forecast the release characteristics of SS for water quality improvement. The current studies assumed that SS release rate is proportional to the rain intensity and suggested exponential washoff models. These models related to the shear force of flow. In this study, a new washoff model is suggested based on relation with SS release rate and mean flow rate of the basin surface which is closely related to the shear force. The proposed model is applied to the Goonja drainage district in Seoul, Korea. The new washoff model simulates the SS discharge more accurately in the various rainfall types. The model can be widely applied to the real problems such as the management of non-point source pollutant and the design of treatment facilities.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2006년도 Proceedings of ISRS 2006 PORSEC Volume I
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• pp.224-227
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• 2006

For estimation of three inherent optical properties (IOPs), the absorption coefficients for phytoplankton ($a_{ph}$) and suspended solid particle ($a_{ss}$) and dissolved organic matter ($a_{dom}$), from ocean reflectance, we used inversion of remote sensing reflectance model (Ahn et al., 2001) at this study. The IOP inversion model assumes that (1) the relationship between remote sensing reflectance ($R_{rs}$) and absorption (a) and backscattering ($b_{b}$) is well known, (2) the optical coefficients for pure water ($a_{w}$, $b_{bw}$) are known, (3) the spectral shapes of the specific absorption coefficients for phytoplankton ($a^*_{ph}$) and suspended solid particle ($a^*_{ss}$) and the specific backscattering coefficients for phytoplankton ($b_b^*_{ph}$) and suspended solid particle ($b_b^*_{ss}$) are known. The input data of IOP inversion model is used in-situ ocean optical data at the seawater around the Korea Peninsula for 5 years (2001-2005). We compared the output data of the IOP inversion model and the in-situ observation for seawater around the Korea Peninsula.

• 한국해양환경ㆍ에너지학회지
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• 제6권2호
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• pp.38-45
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• 2003

본 연구는 항만공사시 발생되는 부유토사의 거동특성을 분석하기 위하여 항만공사 중 가장 비중이 높은 공정 중의 하나인 사석공사를 대상으로 부유토사 발생거동에 대해 조사하였다. 조사는 방파제조성을 위한 기초사석투하시, 준설토투기장 호안조성시 사석투하를 위해 바지선상에서 사석적재시 및 속채움용 사석투하시를 대상으로 하였다. 본 조사결과에 의하면 방파제 기초사석(0.001~0.03㎥)투하시 부유토사의 발생이 현저히 나타났으며, 확산범위는 대조기의 경우 약 500m이상까지 확산됨을 알 수 있었다. 사석적재시(바지선상)의 부유토사의 거동특성에 대한 조사결과 바지선으로부터 해상으로 흘러내리는 사석으로 인해 부유토사가 발생하여 바지선 주변에서는 늪은 탁도를 나타냈다. 수심별 조사결과 표층의 경우 부유토사는 바지선 주변에 국한되고 곧 침강하여 넓은 범위로 확산하지는 않았다. 그러나 저층의 경우에는 약 100m까지 확산되었으며 그 이후 SS농도가 급격히 저하되어 배경농도를 나타냈다. 포크레인을 이용한 속채움용 사석(0.03㎥이하)투하시의 부유토사 거동특성에 대한 조사결과 표층의 경우 약 300m까지, 저층의 경우는 300m 이상까지 확산됨을 알 수 있었다. 본 연구결과에서 흥미로운 사실은 항만공사시 발생하는 부유토사는 표층의 경우 취송류의 영향을 많이 받고 저층의 경우 조류의 영향을 받으며, 부유토사의 확산은 표층보다는 저층으로 더 멀리 확산된다는 사실을 알 수 있었다

• Ocean and Polar Research
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• 제31권2호
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• pp.219-229
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• 2009

In order to establish annual variations in the marine ecosystem of the East China Sea, suspended solids (SSs) and particulate organic carbon (POC) were extensively investigated in the northern part of the East China Sea from August 2003 to April 2008. Surface SS concentrations showed large spatial variations in spring and fall, but not in summer. Surface SS concentrations in spring were lower than those in summer and fall. In summer, SSs discharged from Changjiang were mostly deposited in the coastal areas and did not reach our study area which was located about 260 km from the river mouth. High SS concentrations were observed near the bottom, which resulted from resuspension of bottom sediments by the bottom currents. Surface POC concentrations did not exhibited large seasonal variations. Phytoplankton biomass was a main factor controlling surface POC concentrations. POC/chlorophyll ratios showed large seasonal variations, with maximum numbers in summer. POC/PON ratios were higher in summer than the Redefied ratio (6.6), while they were lower in spring and fall. In summer, higher POC/chlorophyll and POC/PON ratios were probably attributed to the high phytoplankton mortality caused by nutrient depletion in surface waters.

• 해양환경안전학회지
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• 제17권3호
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• pp.185-189
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• 2011

본 연구는 낙동강 하구역의 사주지형 변화를 예측하기 위한 기초적 연구로서 하천유량의 변화에 따른 부유사의 물질수지에 대하여 검토하였다. 낙동강 하구역의 부유사 물질수지는 갈수기시 60,708 kg/day가 유입하고, 홍수기는 306,892 kg/day가 외해를 통하여 유출하는 것으로 산정되었다. 낙동강 하구역은 전반적으로 갈수기 및 평수기에 부유사의 유입, 홍수기에 부유사의 유출이 반복 되지만, 사주지형 주변에서는 부유사의 유입과 유출 거동이 복잡하게 나타나 장기 지형변동 모니터링이 필요한 것으로 나타났다.

• 한국농공학회지
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• 제45권2호
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• pp.126-137
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• 2003

The feasibility study of UV-disinfection system was performed for disinfection of effluent from wastewater treatment plant. Three low-pressure UV lamps of 17, 25, and 41 W were examined with various flow rates. Low-pressure UV lamps of 17W were examined with various turbidity, DOM (dissolved organic matter), and SS (suspended solid). The pilot plant was a flow-through type UV-disinfection system, and the range of exposure time varied from 5 to 40 seconds, turbidity from 0 to 40 NTU, DOM from 0 to 30 mg/L, and SS from 10 to 40 mg/L. The 41W lamp demonstrated complete disinfection showing no survival ratio in all the experimental conditions, and generally 17W and 25W lamps also showed high removal ratio over 97%. For the same UV dose (UV intensity times exposure time), high intensity-short exposure conditions showed better disinfection efficiency than low intensity-long exposure conditions. While the effects of turbidity and DOM were not apparent, the effects of SS was significant on the disinfection efficiency which indicates that SS control before UV-disinfection appears to be necessary to increase removal efficiency. Considering characteristics of effluent from existing wastewater treatment plants, cost-effectiveness, stable performance, and minimum maintenance, the flow-through type UV-disinfection system with high intensity and low-pressure lamps was thought to be a competitive disinfection system for wastewater reclamation.

• 농업과학연구
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• 제24권2호
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• pp.290-297
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• 1997

Danored is considered as the most favorable grape variety for national wine manufacturing in terms of sugar, organic acid contents, annual production amount, as well as quality control convenience after harvest. This study was canied out to know the influence of suspended solid(SS) and skin contact time(SCT) with Danored variety on the white wine quality. The results are summarized as follows; 1. Suspended solid and skin contact time did not greatly influence on the chemical composition of Danored juice. But skin contact time provided slightly increaseness to the content of phenol compounds 2. Suspended solid accelerated fermentation rate of white wine manufacturing. Although the content of suspended solid are less amount than 0.3% in must, wine fermentation was completed to dryness in concentration of sugar. 3. When the content of suspended solid was around 3%, higher alcohol in white wine was increased by the 20%. This result is relatively small increasement compared to the other reported results. 4. Because Danored contained less amount of phenol compounds comparison with other grape varieties, browning capacity in white wine was much favorable to quite low concentration. Especially, phenolic compounds was decreased remarkably as one of fermentation characteristics of Danored variety. 5. As a result of sensory evaluation, wine quality was A-1> B-1> A-2> B-2 in its favorable ranking orders. It was so concluded that A-1 might be the most acceptable one from this study.