• Title/Summary/Keyword: Construction sludge

Search Result 223, Processing Time 0.022 seconds

Characteristics of Sewage sludge, Its Incineration Ash, and Sintering Pellet

  • Lee, Ki-Hwan;Lee, Tae-Ho;Cho, Heon-Young;Han, Ki-Suk
    • Environmental Sciences Bulletin of The Korean Environmental Sciences Society
    • /
    • v.4 no.4
    • /
    • pp.215-220
    • /
    • 2000
  • This study on the incineration ash and sintering pellet from sewage sludge was carried out to evaluate the possibility of recycling in sewage sludge disposal. The samples used in this experiment were raw sewage sludge, its incineration ash, and sintering pellet. The characteristics of the three sample types were identified using X-ray diffraction(XRD), X-ray fluorescence(XRF), atomic absorption spectroscopy(AAS), and inductively coupled plasma spectroscopy(ICP). The chemical compositions of all three sample types were similar in their clay component, however, the sewage sludge had a high content of organic materials. From an analysis of the mineral content of the three sample types, the conversion of their compositions was found to be relative to temperature. Accordingly, incineration ash and sintering pellet both have potential for use as a functional construction material.

  • PDF

A study on solidification of sewage sludge ash by chemical activation (화학 반응을 이용한 하수슬러지 소각재 고형화 연구)

  • Jo, Byung-Wan;Suh, Suk-Koo;Park, Jong-Bin
    • Proceedings of the Korea Concrete Institute Conference
    • /
    • 2005.05b
    • /
    • pp.477-480
    • /
    • 2005
  • The discharge of sewage sludge is rapidly increasing in Korea. But the most common sewage sludge disposal alternative is to incinerate and to deposit it in controlled landfills. However, space limitations on existing landfill sites, and increasing environmental concerns have prompted the investigation of alternative ash disposal routes. The utilization of sewage sludge ash would contribute to the elimination of an environmental problem and to the development of new high-performance materials. The purpose of this study is to apply to Alkali Activation into solidification of sewage sludge ash. It achieves leaching test, chemical composition and compressive strength test. As a result of tests, the sewage sludge ash has sufficient potential for use of pozzolanic raw material. However, it is judge to be available to construction material if research is continuously gone.

  • PDF

Economic Design of Activated Sludge System at the Optimum Sludge Concentration (슬러지 농도 최적화에 따른 합리적인 활성슬러지공정 설계방안 연구)

  • Lee, Byung Joon;Choi, Yun Young
    • Journal of Korea Water Resources Association
    • /
    • v.47 no.5
    • /
    • pp.483-490
    • /
    • 2014
  • The design procedures for a biological reactor and a secondary settling tank (SST) of an activated sludge system are based on the steady state design method (Ekama et al., 1986; WRC, 1984) and the 1-D flux theory design method (Ekama et al., 1997), respectively. This study combined both of the design procedures, to determine the optimum sludge concentration in the reactor and the best design with the lowest cost. The best design of the reactor volume and the SST diameter at the optimum sludge concentration were specified with varying wastewater and sludge characteristics, temperature, sludge retention time (SRT) and peak flow rate. The effects of the influent wastewater characteristics, such as substrate concentration and unbiodegradable particulate fraction, were found to be considerable, but the effect of unbiodegradable soluble fraction was to be negligible. The effects of sludge settling characteristics, were also significant. SRT, as an operating parameter, was found to be an important factor for determining the optimum sludge concentration. However, the effect of temperature was found to be small. Furthermore, for designing a large scale wastewater treatment plant, the number of reactors or SSTs could be estimated, by dividing the total reactor volume or SST area. The new combined design procedure, proposed in this research, will be able to allow engineers to provide the best design of an activated sludge system with the lowest cost.

An Analysis on the Properties of Cement Mortar using Sewage Sludge Incineration Ash (하수슬러지 소각재를 이용한 시멘트 모르타르의 특성분석)

  • Ryu, Heon-Ki;Park, Jeong-Min
    • Journal of the Korean Recycled Construction Resources Institute
    • /
    • v.5 no.3
    • /
    • pp.55-62
    • /
    • 2010
  • This is an experimental research in order to judge the applicability of sewage sludge incineration ash having applied the mixing proportion needed to manufacture bricks and to do plaster work with addition of hwangtoh and slaked lime as a part of the methods for utilizing the wastes produced from sewage sludge incineration ash. Based on the results from experiment and analysis, it is judged that, in case of mixing proportion of 1:2 for the purpose of plastering and masonry work, the cement mortar produced by using a 10% addition ratio of sewage sludge incineration ash with mixture of hwangtoh covering all range of addition ratio, and also the cement mortar produced by using a 20% of sewage sludge incineration ash together with 0% and 10% addition ratio of hwangtoh, was possible to be applied to the practical use. In case of mixing proportion of 1:7 for manufacture of bricks and blocks, if such brick and block products are produced with 10% and 20% addition ratio of sewage sludge incineration ash having added aggregate fines or stone dust that has been actually used in brick and block manufacturing, it is judged that these bricks and blocks could be practically used in the job sites, although strength development is a little bit lower.

  • PDF

A Study on the Possibility of Using Concrete Blocks with Ready Mixed Concrete Sludge (레미콘 슬러지를 활용한 콘크리트블록 활용에 대한 기초 연구)

  • Jung, Jae-Ho
    • Journal of the Korea Institute of Building Construction
    • /
    • v.19 no.4
    • /
    • pp.307-312
    • /
    • 2019
  • Sludge generated in the production of ready-mixed concrete is classified as waste and processed at a high cost. In particular, small and medium-sized ready-mix manufacturer are burdened with such costs, and some companies are illegally processing them. Therefore, the purpose of this study is to suggest a method for recycled remicon sludge as a concrete block composition. When the remicon sludge is simply dried, the residual chemical admixture and ettringitee contained in the sludge are present, so that the compressive strength of the concrete block and the compressive strength after freezing and thawing are largely deteriorated to meet the quality standards of the concrete shore and retaining wall block It was not possible to do. As a method for satisfying the physical performance, it was found that the remicon sludge was calcined at a high temperature of about $900^{\circ}C$. to decompose ettringite and residual chemical admixture and then used it.

Development of a Pavement Cutter for Eco-friendly Road Excavation Construction (친환경 도로굴착 시공을 위한 도로절단기 개발)

  • Kim, Kyoontai
    • Korean Journal of Construction Engineering and Management
    • /
    • v.23 no.6
    • /
    • pp.111-118
    • /
    • 2022
  • Recently, as underground facilities buried under roads in Korea are aging, the amount of underground facility maintenance work is rapidly increasing. For the maintenance and management of such underground facilities, the cutting work of the road pavement should be preceded. However, the conventional road pavement cutters used in Korea are not eco-friendly, and the reality is that they generate a lot of noise and cutting sludge (scattering dust). Therefore, in this study, the concept of the cutting sludge recovery device was derived, and an eco-friendly pavement cutter including this function was designed and manufactured. The developed equipment took about 20 to 30 seconds to cut 1m to a depth of 100 to 150mm. Also, the sludge suction performance was good in most sections, and the noise level of the equipment briefly measured at a distance of 2m was 82.7dB on average. However, due to the limitation that the developed equipment was at the level of the first prototype, the driving stability was somewhat low, and equipment abnormalities such as engine shutdown and sludge recovery performance decreased in some cases. The cutting performance and sludge recovery function will be more stable through tuning and improvement of the developed prototype in the future. In addition, we plan to quantitatively compare and analyze productivity by applying the improved prototype to actual field conditions.

Experimental Study on the Manufacture and the Mechanical Properties of Fiber Reinforced Calcium Silicates-Cement Composites Utilizing Fly Ash and Cement Sludge for Construction Materials(II) (플라이애쉬와 시멘트슬러지를 이용한 섬유보강 규산칼슘계 시멘트 복합체의 제조 및 역학적 특성에 관한 실험적 연구)

  • 박승범;임창덕;윤의식;김종호
    • Proceedings of the Korea Concrete Institute Conference
    • /
    • 1995.10a
    • /
    • pp.75-79
    • /
    • 1995
  • The results of an experimental study on the manufacture and the mechanical properties of fiber reinforced calcium silicates-cement composites utilizing by products (fly ash or cement sludge) for construction materials are presented in this paper. As the test results show, compressive, tensile, and flexural strength, fracture toughness of fiber reinforced calcium silicates-cement composites were improved by increasing the fly ash and fiber contents, but were decreased by increasing cement sludge contents. Somehat, especially increasing fiber contents the fracture toughness of the composites were remarkably increased. Also, the mechanical properties of the composites reinforcing alkali-resistance GF were higher than those of the composites reinforcing Samoa Pulp.

  • PDF

SEM Analysis Property of Non-cement Light-weight Matrix according to Type and Mixing Ratio of Alkali Activator (알칼리자극제 종류 및 혼입율에 따른 무시멘트 경량 경화체의 SEM분석 특성)

  • Shin, Jin-Hyun;Kim, Tae-Hyun;Lee, Dong-Hoon;Lee, Sang-Soo
    • Proceedings of the Korean Institute of Building Construction Conference
    • /
    • 2017.11a
    • /
    • pp.161-162
    • /
    • 2017
  • As the use of cement increases with the development of modern society along with the increase of buildings, environmental pollution intensifies and researches on industrial byproducts are continuing. Research on blast furnace slag and fly ash as industrial byproducts is increasing, and research on industrial byproducts such as polysilicon sludge and paper ash used in this study is increasing. Blast furnace slag, which is one of the industrial byproducts, has been widely studied as a material used with cement. However, in this study, we fabricated lightweight matrix of polysilicon sludge and paper ash replaced based on blast furnace slag, and performed SEM analysis.

  • PDF

Basic Characterization of Resource-recycling Secondary Products of Cement by Using Sludge Solids as The Main Material (회수수 슬러지 고형분을 주재료로 한 자원순환형 시멘트 2차 제품 생산의 기초적 특성 평가)

  • Kim, Min-Sung;Hong, Sung-Jun;Kim, Young-Jin;Ryu, Dong-Woo
    • Proceedings of the Korean Institute of Building Construction Conference
    • /
    • 2021.11a
    • /
    • pp.118-119
    • /
    • 2021
  • In this study, we confirmed the basic characteristics of paste and mortar 1:1, 1:2, 1:3 composition using concrete sludge solid content for the purpose of developing a resource-recycling cement secondary products. The 1:2 mortar formulation showed the best compressive strength. The steam curing strength is superior in the order of C20, BS40, BS20 and Control. it is judged that the FA combination is not suitable.

  • PDF