• Title, Summary, Keyword: suspended solids

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Characteristics of Suspended Solids Movement in the Sand Recalmation of Breakwater (방파제 모래치환공사시 부유토사의 거동 특성)

  • Maeng, Jun-Ho;Lee, Ji-Wang;Kim, Byung-Jun;Ko, Jung-Yong;Yang, Gwon-Yeol
    • Journal of Environmental Impact Assessment
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    • v.9 no.2
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    • pp.127-142
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    • 2000
  • This research was performed for analyzing the transport of suspended solids during the harbor construction. In behalf of the research, we have analyzes the characteristics of suspended solids movement in sand reclamation of breakwater according to age of tide and tidal period at the construction spot of Pusan new harbor. In the process of sand reclamation, soil was dumped by a dumping device which direct soil from the barge to the bottom of the sea. According to the results from this research, suspended solid concentration was very high in the range of 5m from the dumping point right after the dumping. However these suspended solids settled very quickly and the solids concentration was very beyond 10m from the dumping point. It is deduced that the movement of solids dumped from barge has the tendencies as following; 1) Most of the dumped solids precipitated quickly after the dumping 2) The rest of the suspended solids are diffused slowly toward the bottom of the water being figured smoothing curve 3) The diffusion movement of suspended solids tend to proceed toward the shore line in a parallel motion with tidal current at the sea-bottom That is to say, most of the suspended solids precipitated very quickly even though highly concentrated solids produced at the bottom of the solids which did not precipitated spread with the tidal current horizontally along the bottom of the sea.

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The Effects of Suspended Solids on the Mortality and the Glycogen Content of Abalone, Haliotis discus hannai (참전복, Haliotis discus hannai의 폐사 및 글리코겐 함량에 미치는 부유토사의 영향)

  • Lee, Kyoung-Seon
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.14 no.3
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    • pp.183-187
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    • 2008
  • Elevated concentrations of suspended solids in the marine enrironment caused by coastal developments have threatened to the marine ecosystem. Effects of suspended solids on the mortality and the modifications of glycogen levels of abalone, Haliotis discus hannai were studied. Abalone were exposed to suspended solids with concentrations of 0 (control), 1,000, 1,500 and 2,000 mg/ L for 96h. These suspended solids had no effect on the mortality of abalone. Significant decreases in the glycogen content of soft tissues were observed over 1,500 mg/ L concentration of suspended solids. These results suggested that abalone could tolerate a high level of suspended solids. However, it is necessary to observe further the long term effects of suspended solids on the physiological responses of abalone.

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Review on the Biological Effects of Suspended Solids on Shellfish, Fish, and Seaweed (부유물질이 패류, 어류 및 해조류에 미치는 생물학적 영향에 관한 고찰)

  • Lee, Kyoung-Seon
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.21 no.1
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    • pp.109-118
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    • 2015
  • In order to obtain basic informations about impact assessment of marine life by suspended solids in coastal waters, the survey about recent study related with suspended solids effects on exploitable marine life (shellfish, fish, seaweed.) was tried. 1) The paper concerning impacts of suspended solids on marine life has been mainly focused on shellfish. 2) Effects of suspended solids on marine life mainly investigated for acute toxicity. 3) Experiments with suspended solids are intended on adult and juvenile in shellfish, egg and juvenile in fish, and spores in seaweed. Biological impacts of suspended solids can vary depending on concentrations, duration, and life stage, and these informations would improve a knowledge of the effects of suspended solids on marine life.

Importance of the Settling Velocity on the Suspended Solids Diffusion in Osaka Bay (오사카만에서 부유토사의 확산특성에 대한 침강속도의 중요성)

  • 김종인
    • Journal of Ocean Engineering and Technology
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    • v.16 no.5
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    • pp.41-48
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    • 2002
  • Numerical experiments are conducted using a three-dimensional baroclinic equation model and a Lagrangian method for clarifying the effect of th settling velocity on the suspended solids diffusion caused by the dredging and the reclamination works. Diffusion characteristics of the neutral particles and the weighting particles is experimented by the Lagrangian particles trajectory model, The results show that the diffusion characteristics of the suspended solids is effected by the settling velocity classified by the particles size in the density layered semi-closed bay. To estimate exactly the diffusion characteristics of the suspended solids and the contaminant with weight the three-dimensional baroclinic equation model and the three-dimensional Lagrangian particles trajectory model considering the settling velocity of the particle in the density layered semi-closed bay must be used.

Removal of Fine Suspended Solids and Soluble Heavy Metals in H Mine Drainage using Settling and Filtering : Field Application (침전 및 여과를 통한 H 광산배수 내 미세부유물질 및 용해성 중금속의 제거 : 현장실험을 중심으로)

  • Oh, Minah;Kim, WonKi;Oh, Seungjin;Kim, DukMin;Lee, SangHoon;Lee, Jai-Young
    • Journal of Soil and Groundwater Environment
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    • v.18 no.7
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    • pp.54-62
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    • 2013
  • Fine suspended solids and soluble heavy metals generated from mine drainage could destroy environment as the aesthetic landscapes, and depreciate water quality. Therefore, this research is focused on process development applied the actual field for controlling fine suspended solids and heavy metals, and so that bench-scale tests were performed for field application based on advanced researches. The field of mine drainage in this research was in H mine located Taebaek-si, Gangwon-do. The inclination plates were mounted 2 kinds of arrangement (octagon and radial types) in circle type settling basin. The inclination plates could be helped to settle of suspended solids; decreased 34% of suspended solids and 50% of turbidity in effluent. Radial type of inclination plates showed the results that is more efficient to settle of suspended solids (average to 3.45 mg/L) compared to octagon type. In the experiments to decrease retention time of mine drainage in settling basin from 6 hrs to 1.5 hrs, suspended solid concentration was exceeded to 30 mg/L as the standard for suspended solid at 10 days after the operation under tha retention time of 3hrs and 1.5hrs. In the tests for filtration, granular activated carbons were indicated the better effective to filtering and absorption of fine suspended solid and soluble heavy metals than anthracite.

Study on the Long-term Change of nitrogen in the Tidal Area of River (하천 감조부에 있어서 질소의 장기변동에 관한 연구)

  • 김원규;강주복
    • Water for future
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    • v.25 no.2
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    • pp.67-78
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    • 1992
  • Several field surveys were conducted to investigate changes of water quality with time in a tidal river. Results indicated that nitrification process were dependent on the change of salinity and suspended solids concenttration. Therefore laboratory batch experiments were conducted, using suspended solids and sediment taken from a tidal river, to study the effect of salinity on nitrification and to estimate kinetic parameters of it in the tidal river. suspended solids and sediment were sampled at a point in the middle stream. Sediments were collect from the aerobic layer of mud. The change of nitrogen concentration with time was clearly explained with Monod groth model and kinetic parameters were obtained by curve fitting method. Changes in NH4-N, NO2-N, and NO3-N concentrations in the river ROKKAU with time were simulated well using Lagrangian reference frame and parameter values obtained in the laboratory tests. T도 mechanism of nitrification by suspended solids and sediment in a tidal river is shown to depend on tidal effects.

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A Study on the Removal of Algae by a Mechanical Screw Brush Cone Filter (기계식 스크루 브러쉬 콘필터를 이용한 조류 제거에 관한 연구)

  • Kim, Do-Hee
    • Journal of Environmental Science International
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    • v.26 no.2
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    • pp.201-210
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    • 2017
  • This study was conducted to estimate the removal efficiency of algae by a mechanical Screw Brush Cone Filter in a lake. The device used a stainless steel cone-shaped filter with a screw brush. The ability of the developed device to remove algae larger than $20{\mu}m$ in Lake ChaSa, Gwangyang city was tested from August to September 2014. The results show that the removal rates for chlorophyll-a, suspended solids and volatile suspended solids were 44-87%(mean 61%), 35-54%(mean 40%), and 37-46%(mean 43%), respectively. This study also discusses equipment and device operation costs and device application problems, and suggests in situ. solutions to these problems.

The Distribution and Interannual Variation in Nutrients, Chlorophyll-a, and Suspended Solids in the Northern East China Sea during the Summer (동중국해 북부해역에서 여름동안 영양염, 엽록소, 부유물질의 분포 특성 및 연간 변화)

  • Kim, Dong-Seon;Kim, Kyung-Hee;Shim, Jeong-Hee;Yoo, Sin-Jae
    • Ocean and Polar Research
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    • v.29 no.3
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    • pp.193-204
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    • 2007
  • In order to find out the annual variations in the marine ecosystem of the East China Sea, temperature, salinity, nutrients, chlorophyll-a, suspended solids, and suspended particulate organic carbon were extensively investigated in the northern East China Sea during the Summer of 2003 and 2006. During the Summer of 2003, the northern East China Sea was not significantly affected by the input of fresh waters from the Changjiang River. During the Summer of 2006, however, fresh waters of the Changjiang River intruded into the western part of the study area where temperature, nitrate, and phosphate in the surface waters were higher than in the other areas, and salinity, silicate, and suspended solids in the surface waters were lower. As a result of the increase in nitrate and phosphate concentrations, concentrations of chlorophyll-a and suspended particulate organic carbon increased in the western part compared with the other areas. However, the depth-integrated chlorophyll-a concentrations measured during the Summer of 2003 were rather similar to those during the Summer of 2006, and not considerably different from those measured in the East China sea during the Summer of 1994 and 1998. Therefore, the depth-integrated chlorophyll-a concentrations have not significantly changed in the East China Sea over the last 12 years. The lower concentrations of silicate and suspended solids in the western part may be related to construction of the Three-Gorges Dam since the concentrations of silicate and suspended solids in fresh waters of the Changjiang River have significantly decreased after construction of the Three-Gorges Dam in June 2003.

Separation Performance of a Low-pressure Hydrocyclone for Suspended Solids in a Recirculating Aquaculture System

  • Lee, Jin-Hwan
    • Fisheries and aquatic sciences
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    • v.13 no.2
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    • pp.150-156
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    • 2010
  • The separation performance of a low-pressure hydrocyclone (LPH) was evaluated for suspended-solids removal in a recirculating aquaculture system (RAS). The dimensions of the LPH were 335 mm cylinder diameter, 575 mm cylinder height, 60 mm overflow diameter, 50 mm underflow diameter, and $68^{\circ}$ cone angle. The inflow rate varied (400, 600, 800, and 1,000 mL $s^{-1}$) with 25%, 25%, 20%, and 10% of bypass ($R_f$), respectively. The maximum total separation efficiency (Et) and reduced separation efficiency (E't) for suspended solids from the effluent of the second settlement tank (before biofiltration) were 58.9% and 45.2%, respectively, at an inflow rate of 600 mL $s^{-1}$ and 25% of $R_f$. The maximum Et and E't for suspended solids from the water supply channel (after biofiltration) were 24.4% and 16%, respectively, at an inflow rate of 1,000 mL $s^{-1}$ and 10% of $R_f$. The maximum grade efficiency (Ei) was 51.6% for a 300 ${\mu}m$ particle size at an inflow rate of 600 mL $s^{-1}$ with 23% of $R_f$. The maximum reduced grade efficiency (E'i) was 37.6% for a 300 ${\mu}m$ particle size at an inflow rate of 1,000 mL $s^{-1}$ with 11% of $R_f$. The results indicate that the separation performance of the LPH for suspended solids removal was size selective and that maximum removal occurred at particle sizes ranging from 300 to 500 ${\mu}m$.

Removal of Cs+, Sr2+, and Co2+ Ions from the Mixture of Organics and Suspended Solids Aqueous Solutions by Zeolites

  • Fang, Xiang-Hong;Fang, Fang;Lu, Chun-Hai;Zheng, Lei
    • Nuclear Engineering and Technology
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    • v.49 no.3
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    • pp.556-561
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    • 2017
  • Serving as an excellent adsorbent and inorganic ion exchanger in the water purification field, zeolite 4A has in this work presented a strong capability for purifying radioactive waste, such as $Sr^{2+}$, $Cs^+$, and $Co^{2+}$ in water. During the processes of decontamination and decommissioning of suspended solids and organics in low-level radioactive wastewater, the purification performance of zeolite 4A has been studied. Under ambient temperature and neutral condition, zeolite 4A absorbed simulated radionuclides such as $Sr^{2+}$, $Cs^+$, and $Co^{2+}$ with an absorption rate of almost 90%. Additionally, in alkaline condition, the adsorption percentage even approached 98.7%. After conducting research on suspended solids and organics of zeolite 4A for the treatment of radionuclides, it was found that the suspended clay was conducive to absorption, whereas the absorption of organics in solution was determined by the species of radionuclides and organics. Therefore, zeolite 4A has considerable potential in the treatment of radioactive wastewater.