• Title/Summary/Keyword: Limestone sludge

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A study on biological treatment of abandoned acidic mine drainage using sewage sludge and papermill sludge as carbon sources (하수슬러지와 제지슬러지를 탄소원으로 이용한 폐탄광페수의 생물학적 처리에 관한 연구)

  • 김은호;장성호
    • Journal of Korea Soil Environment Society
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    • v.4 no.2
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    • pp.63-75
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    • 1999
  • This study was performed to investigate applicabilities of sewage sludge and papermill sludge as carbon sources in biologically treating abandoned acidic mine drainage, and effects of limestone. In spite of ranging average 3.3 in influent pH, SRB(Sulfate Reducing Bacteria) was well grown. because effluent pH was maintained by alkalinity a little under for whole stages. TCODcr was high in effluent with washing out in early stage. but its concentration was low with passed time and did not cause the problem of secondary pollution. Removal rate of Mn was remarkably low, but in case of heavy metals such as Fe, the fixation trends showed high as the volume of ${SO_4}^2$ reduction increased. In case of mixing sewage sludge and papermill sludge, when their mixing ratio were 1 : 1 and 2 : 1 respectively, rate of ${SO_4}^2$ reduction and removal rate of heavy metals were high. The mixing ratio 1 : 1 was considered as the most appropriate, because degradability of swewage sludge under short time was higher than that of papermill sludge. As a result of investigating efficiencies of limestone and biological treatment, biological treatment excelled limestone in neutralization and removal rate of heavy metals.

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Soil Loss Reduction and Stabilization of Arsenic Contaminated Soil in Sloped Farmland using CMDS (Coal Mine Drainage Sludge) under Rainfall Simulation (광산지역 비소오염 경사 농경지 토양의 안정화 및 유실 저감을 위한 석탄광산배수슬러지의 적용성 평가)

  • Koh, Il-Ha;Kwon, Yo Seb;Jeong, Mun-Ho;Ji, Won Hyun
    • Journal of Soil and Groundwater Environment
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    • v.26 no.6
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    • pp.18-26
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    • 2021
  • Soil aggregation begins with flocculation of clay particles triggered by interfacial reactions of polyvalent cation such as Ca2+ and Fe3+, and they are also known as important elements to control the mobility of arsenic in soil environment. The objective of this study was to investigate the feasibility of CMDS (coal mine drainage sludge) for soil loss reduction and stabilization of arsenic-contaminated soil in a 37% sloped farmland under rainfall simulation. The amount of soil loss decreased by 43% when CMDS was applied, and this result was not significantly different from the case of limestone application, which yielded 46% decrease of soil loss. However, the relative amount of dispersed clay particles in the sediment CMDS-applied soil was 10% lower than that of limestone-applied soil, suggesting CMDS is more effective than limestone in inducing soil aggregation. The concentrations of bioavailable arsenic in CMDS amended soil decreased by 46%~78%, which was lower than the amount in limestone amended soil. Therefore, CMDS can be used as an effective amendment material to reduce soil loss and stabilize arsenic in sloped farmland areas.

Influence of pH on Mn Concentration of Effluent from Sludge Thickener of Water Treatment Plant (정수장 슬러지 농축조 배출수의 망간 농도에 미치는 pH의 영향)

  • Kim, Younjung;Lee, Seungeun;Baek, Seungcheol;Kim, Taeheui
    • Journal of the Korean GEO-environmental Society
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    • v.16 no.5
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    • pp.27-33
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    • 2015
  • Manganese in sludge precipitated during water treatment might be soluble again in effluent from sludge thickener. If that happens, the manganese concentration of effluent from water treatment plant will exceed the limit for clean reservation. In this study the influence of pH on Mn concentration of effluent from sludge thickener of water treatment plant was investigated. When the pHs of sludge solutions increased with alkaline materials such as NaOH, KOH, CaO, $Ca(OH)_2$, $CaCO_3$, the Mn concentrations of sludge solutions decreased under the limit. The Mn concentration of effluent from sludge thickener could be controlled with waste limestones from beneficiation process at limestone mine as an alkaline material.

The Effects of Desulfurization by Screen using Ca-based Absorbent in a Solid Waste Fluidized-bed Combustor (유동층연소로에서 제지공장 폐기물을 이용한 황산화물 제어시 스크린에 의한 탈황효과)

  • 조상원;이재홍;조기철;장상용;오광중
    • Journal of Environmental Science International
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    • v.7 no.6
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    • pp.783-791
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    • 1998
  • The objectives of this study were to investigate the characteristics of desulfurization under different experimental conditions and the effects of desulfurization bed fluidized bed combuster installed with the screen. The experimental results were as follows ; First, as the height of fluidized bed combustor becomes higher, the concentrations of $SO_2$ mainly increased and sulfur retion of paper sludge was higher than that of natural limestone. Second, the desulfurzation by natural limestone occurred at in-bed and the desulfurization by paper sludge occurred in the whole of fluidized bed combuster. In addition, we identified calcium sulfate by the analysis of SEM and XRD. Third, screen at splash region increased sulfur retention 2~5%, air velocity and anthracite fraction had a little effect on the sulfur retention.

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Anaerobic Biological Treatment of Abandoned Metallic Mine Drainages with Limestone and Recycling of Papermill and Livestock Sludge (석회석과 제지·축산슬러지를 재활용한 폐금속광산폐수의 혐기성 처리)

  • Kim, Eun-Ho;Kim, Hyeong-Seok;Sung, Nak-Chang
    • Journal of Korean Society of Environmental Engineers
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    • v.22 no.3
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    • pp.463-473
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    • 2000
  • This research was carried out to investigate chemical pretreatment using limestone in treating abandoned metallic mine drainage with anaerobic biological treatment, and to estimate application of papermill and livestock sludge as carbon sources for SRB (Sulfate Reducing Bacterial. Capacity of anaerobic limestone bed was steeply decreased. But if limestone was utilized as pretreatment process in treating them with anaerobic biological treatment. it could look forward to stabilize system because it did initally neutralize them. Effluent SCOD in R-4 was lower than R-l~R-3 in inital HRT 5day but its concentration was high in HRT 1day after passed time. Therefore in point of durability and supply of organic matter. it seemed that R-4 was useful became organic matter in R-4 was not consumed by excessive degradation within short period. In all reactors, pH was suitable for SRB growth in whole HRT, but on the evidence of ORP, SRB was active after HRT 2day. Fixation trend of heavy meta s showed high as $SO_4{^{2-}}$ reduction efficiency increased, and $SO_4{^{2-}}$ reduction and fixation of heavy metals were relatively high in HET 2day.

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Analyses of Physical Properties of Copper-contained Sludge Pelletized for Applied Pyro-metallurgical Process (건식제련용 동 함유 슬러지 펠렛 제조 및 물리적 특성평가)

  • Kim, Suyun;Kim, Youngjin;Kim, Seunghyun;Lee, Jaeryeong
    • Resources Recycling
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    • v.28 no.2
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    • pp.31-39
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    • 2019
  • The pelletizing of printed circuit board (PCB) sludge was researched for copper recovery in pyrometallurgical process. This pelletizing was carried out by using self-manufactured compression-type apparatus after pre-treatments (drying, water scrubbing, size classification) were proceeded. The physical properties (compression strength and drop-breakage test) were tested with a change of sludge sizing and the number of compression. In the case of using the undersized sludge of #140, its properties were improved to 0.6 MPa and 9.3 times. Moreover, they increased to 0.82 MPa and 19.0 times by using the #140 ~ 325 sludge. These imply that the packing density increases due to the elimination of large-sized sludge (#140), and also the weight of required binder decreases by the removal of fine-sized sludge (#325).

Comparative Study on Laboratory Experimental Results for Removal Efficiencies of Heavy Metals in AMD & ARD using Natural Materials (천연물질을 이용한 AMD및 ARD내의 중금속 저감효율 실내실험 결과 비교연구)

  • 최정찬;이민희
    • Economic and Environmental Geology
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    • v.37 no.1
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    • pp.133-142
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    • 2004
  • The purpose of this study is to evaluate a laboratory test on arsenic removal effciency for ARD(Acid Rock Drain-age) using limestone and apatite, and on heavy metals removal efficiencies for AMD(Acid Mine Drainage) using apatite and fish bone. As a result of the laboratory test, pH, arsenic removal rate of limestone & apatite are inversely proportional to flow rates and apatite removes 100% of arsenic while limestone removes 37% of arsenic at 0.6$m{ell}$/min/kg flow rate in case of ARD treatment. And the dissolution amount of apatite is twenty five times higher than that of limestone. In case of AMD treatment, fish bone shows higher dissolution rate than apatite, and pH of outlet water reacted with fish bone is higher than that reacted with apatite. The heavy metal removal rates of fish bone are also higher than that of apatite except arsenic removal rate. The precipitate resulted from fish bone reaction with AMD seems to be biological sludge type while that resulted from apatite with AMD is inorganic solid which can settle easily compared with the biological sludge and can be cemented by gypsum. As the results, apatite can be used as a precipitant for the polluted mine waters showing wide range of pH and fish bone can be used for highly contaminated AMD.