• Title/Summary/Keyword: Construction sludge

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Applicability of Stone Powder Sludge as a Substitute Material for Quartz Sand in Autoclaved Aerated Concrete

  • Kim, Jin-Man;Choi, Se-Jin;Jeong, Ji-Yong
    • Journal of the Korea Institute of Building Construction
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    • v.17 no.1
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    • pp.111-117
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    • 2017
  • Stone powder sludge is a byproduct of the crushed aggregate industry, and most of it is dumped with soil in landfills. The disposal of stone powder sludge presents a major environmental problem. This paper investigates the effects of stone powder sludge on the fluidity, density, strength and micro-structure properties of AAC(autoclaved aerated concrete) samples. Stone powder sludge was obtained from a crushed aggregate factory in order to investigate its applicability as a substitute for quartz sand in AAC. To determine the properties of the AAC samples produced with stone powder sludge, specimens containing different foam ratios were produced. Flow value, density, compressive strength, tensile strength and flexural strength of the samples were tested, and X-ray diffraction (XRD) was performed. The test results indicated that the compressive strength of AAC specimens (F120) with stone powder sludge was higher than that of AAC specimens (Q120) with quartz sand for same foam ratio of 120%. For all XRD diagrams, a higher number of tobermorite peaks was shown for the F120 sample than for the Q120 sample, which may explain the slightly higher strength gain in the F120 sample.

Physical Properties of Matrix According to Replacement Ratio using Polysilicon Sludge Based on Light Burned Magnesia (경소마그네시아 기반 폴리실리콘슬러지 치환율에 따른 경화체의 물리적 특성)

  • Kim, Yong-Gu;Kim., Dae-Yeon;Shin, Jin-Hyun;Lee, Sang-Soo;Song, Ha-Young
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2019.11a
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    • pp.143-144
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    • 2019
  • Recently, environmental pollution related to global warming is on the rise. Meanwhile, renewable energy is a representative example of many efforts to develop eco-friendly energy to solve the depletion of natural resources and the depletion of petroleum resources in conjunction with global warming. Among them, photovoltaic power generation is increasing the subsidies for the government to increase the production of photovoltaic electricity of the general public, showing a high growth rate. However, polysilicon, which is a raw material of the photovoltaic panel, generates waste called polysilicon sludge in the manufacturing process. In order to produce 1 ton of polysilicon, about 2 tons of waste polysilicon sludge is generated. In 2012, polysilicon sludge was generated at 78,000 tons, with an average of about 220 tons per day. The sludge generated due to insufficient treatment of polysilicon sludge is currently solidified and is processed by landfilling. Therefore, in this study, polysilicone sludge is used as the concept of admixture, and the physical properties of the matrix according to the polysilicon sludge replacement ratio based on light burned magnesia is determined.

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Thermal insulation property according to pearlite addition ratio of non cement matrix using paper ash and polysilicon sludge (제지애시와 폴리실리콘 슬러지를 활용한 무시멘트 경화체의 펄라이트 첨가율에 따른 단열특성)

  • Shin, Jin-Hyun;Kim, Dae-Yeon;Lee, Dong-Hoon;Lee, Sang-Soo
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2018.11a
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    • pp.165-166
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    • 2018
  • Researches for the development of renewable energy as a fuel substitute for global warming and depletion of petroleum resources are actively being carried out. Among them, the annual growth rate of PV generation is 20.73%, which is higher than other renewable energy sources. However, the production of 1 ton of polysilicon, which is known as a raw material for solar power generation panels, generates 2 tons of waste. As the demand for PV panels increases, the problem of the treatment of polysilicon sludge is attracting attention, and studies on the utilization of polysilicon sludge are needed. Therefore, in this study, the applicability of polysilicon sludge treated as industrial waste to the lightweight panel for architectural purposes was examined.

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Density and Strength Properties according to the Paper Ash addition ratio of the Lightweight Composite Panel Core Using the Blast Furnace Slag and Polysilicon Sludge (고로슬래그와 폴리실리콘 슬러지를 활용한 경량복합패널 심재의 제지애시 첨가율에 따른 밀도 및 강도특성)

  • Lim, Jeong-Geun;Lee, Ji-Hwan;Park, Hee-Gon;Lee, Sang-Soo
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2015.05a
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    • pp.152-153
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    • 2015
  • Recently, solar energy generation is one of the fastest growing industries for eco-friendly energy. Every year, solar energy generation industry grows to 42% on average. However, polysilicon sludge is generated from processing of polysilicon but, there is nothing to handle that. Therefore, we need research to recycle polysilicon sludge. Also, improved fire resistance efficiency of wall is required according to reinforced fire safety standards due to many cases of big fires in our country. This study focuses on density and strength properties according to the addition ratio of paper Ash for the lightweight composite panel core with polysilicon sludge. As a result of the test, adding paper ash 9% has the best density and strength properties.

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Dynamic Properties of the Mortar Utilizing the Polysilicon Sludge as the Cement Admixture Material (시멘트 혼화재로써 폴리실리콘 슬러지를 활용한 모르타르의 역학적특성)

  • Lim, Jeong-Geun;Lee, Sang-Soo;Song, Ha-Young
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2014.05a
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    • pp.240-241
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    • 2014
  • The environmental pollution problem the globally related to global warming arises. In the construction industry the cement mostly use material, generates the great quantity of CO2 among the fired process and the global warming is more aggravated. In addition, the polysilicon that is the main raw material used in the solar power generation, produces 1 ton and the industrial by-product of 2 tons is generated. In this way, the arising sludge there is not method recycling and it is all discarded. Therefore, in this research, try to present as the fundamental research material for using the polysilicon sludge as the admixture of the cement in order to reduce the amount of the cement. The based on 'KS L ISO 679' was progressed mortar test. the liquidity, air flow rate, setting time, water absorption ratio, flexural and compression strength was measured. According to, appropriate replacement ratio of the polysilicon sludge tries to analyze.

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Recovery of Dissolved Volatile Fatty Acids from Liquid Sludge using Anaerobic Membrane-fermenter System (혐기성 분리막을 이용한 액상 슬러지로부터의 용해성 저급 지방산의 회수)

  • Kim, Jong-Oh;Kim, Seog-Ku;Kim, Ree-Ho
    • Journal of Korean Society on Water Environment
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    • v.20 no.2
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    • pp.183-189
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    • 2004
  • The performance of a membrane-coupled anaerobic fermenter system for the recovery of volatile fatty acids (VFAs) from liquid organic sludge was experimentally investigated. Permeation flux was stably kept around $0.2(m^3/m^2/day)$ during operational period. The membrane-coupled fermenter showed 2.2 times higher VFAs concentration and higher VFAs forming rate than those of fermenter without membrane. The fermenter with membrane proved to be an effective system for the recovery of soluble organic materials from liquid sludge.

Fundamental Properties of Recycled Cold Asphalt Mixtures with Recycled Sludge and Recycled Glass Aggregate (순환 슬러지 및 순환 유리골재를 사용한 순환 상온아스팔트 혼합물의 기초특성)

  • Lee, Hoo-Seok;Kang, Suk-Pyo;Kang, Hye-Ju;Lee, Min-Hi
    • Journal of the Korean Recycled Construction Resources Institute
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    • v.8 no.3
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    • pp.302-309
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    • 2020
  • This paper is a basic study for applying the dried recycled sludge of waste sludge generated in construction waste intermediate treatment facility and the crushed recycled glass aggregate of waste glass bottles that cannot be recycled to the recycled cold asphalt mixtures. This paper reviewed the characteristics of recycled cold asphalt mixtures using recycled sludge and recycled glass aggregate. As a result, as contents of recycled sludge and recycled glass aggregate increased, the Marshall stability, indirect tensile strength, and tensile strength ratio of the recycled cold asphalt mixtures decreased, but flow and void ratio of that increased.

An Experimental Study on Stabilization/Solidification of Plated Sludge using Cement (시멘트를 이용한 도금 슬러지 고형화에 대한 실험적 연구)

  • 김남중;김광서
    • Journal of the Korea Institute of Building Construction
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    • v.1 no.2
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    • pp.146-153
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    • 2001
  • Radical development has been made in the every field of our society for the past scores of year. Radical development of industry and lining environment has mass-produced various toxic wastes . Which comes to the fore as a serious environmental problem. The purpose of this is to suggest the optima mix design by studying the utility of a toxic waste, plated sludge as a building material and deciding the standards of quality and use of cement and evaluating the properties of mortar and concrete in which plated sludge mixed. From an experiment, compressive strength required high early strength cement or special cement. Watertightness proved to be excellent. Heavy metals, such as Cd, Pb, Cu came out below an environmental standard. Cr+6 exceeded an environmental standard under a steam curing, but came out below an environmental under a standard curing. The higher replacement rate was, the lower frost, fusion and resistance were. Thus, got better results above the goal by condition. It was possible that plated sludge was replaced and solidified to aggregate. Therefore, it is necessary to define the standards of quality on strength, replacement rate of wastes, water permeability, endurance in other to solidify plated sludge to concrete products.

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Relation between sludge properties and filterability in MBR: Under infinite SRT

  • Zhang, Haifeng;Wang, Bing;Yu, Haihuan;Zhang, Lanhe;Song, Lianfa
    • Membrane and Water Treatment
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    • v.6 no.6
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    • pp.501-512
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    • 2015
  • A laboratory-scale submerged membrane bioreactor (MBR) was continuously operated for 100 d at an infinite sludge retention time (SRT) with the aim of identifying possible relation between the filterability of mixed liquor and sludge properties, such as extracellular polymeric substances (EPS), soluble microbial products (SMP), viscosity of mixed liquor, zeta potential of flocs and particle size distributions (PSD). Research results confirmed that MBR can operate with a complete sludge retention ensuring good treatment performances for COD and $NH_3-N$. However, the long term operation (about 40 d) of MBR with no sludge discharge had a negative influence on sludge filterability, and an increase in membrane fouling rates with the time was observed. There as a strong correlation between the sludge filterability and the fouling rate. Among the different sludge properties parameters, the concentration SMP and EPS had a more closely correlation with the sludge filterability. The concentrations of SMP, especially SMP with MW above 10 kDa, had a strong direct correlation to the filterability of mixed sludge. The protein fractions in EPS were biodegradable and available for microorganism metabolism after about 60 days, and the carbohydrates in EPS had a significantly negative effect on sludge filterability in MBR at an infinite SRT.

A Study on the Thermal Characteristics in the GPV with Heat Release by Wet Oxidation (습식산화반응열을 고려한 GPV 내 열적 특성 해석)

  • Seo, Hyeon-Seok;Lee, Hong-Cheol;Yang, Jun-Seung;Ahn, Jae-Hwan;Hwang, In-Ju
    • Proceedings of the SAREK Conference
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    • 2009.06a
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    • pp.392-397
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    • 2009
  • Gravity pressure vessels find their use in the wet oxidation of sewage sludge, which can be defined as the oxidation of organic and inorganic substances in an aqueous solution or suspension by means of oxygen or air at elevated pressures and temperatures. Numerical analyses were carried out for investigating the flow characteristics and wet air oxidation in the reaction vessel with various conditions such as supply oxidation and the supply positions of oxidation, etc. Wet air oxidation is promoted in the vicinity of bottom in the reactor with increase of oxygen supply. Also, it is the best condition to the oxidation supply position of 150 m and oxidation flow of 0.06 kg/s in the GPV reactor as the remnant of sludge and creation of organic acids.

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