• Title/Summary/Keyword: Paper Sludge

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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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Quality Properties Sintering Lightweight Aggregate for Structural Concrete according to manufacturing Condition (제조 조건에 따른 구조체용 소성 경량골재의 품질 특성)

  • 고대형;김재신;김상운;문경주;소양섭
    • Proceedings of the Korea Concrete Institute Conference
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    • 2000.10a
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    • pp.339-344
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    • 2000
  • The purpose of this study is to evaluate qualities of lightweight aggregate for structural concrete according to mixing proportions, pelletizer condition, sintering condition and to choose the suitable main and sub material. Main material used paper sludge ash(PSA) and sub material used clay, fly-ash and paper sludge. The aggregates are sintered after granulating at the various condition. As the result of test, quality difference of aggregate showed clear according to the mixing proportions and sintering conditions. It was possible to manufacture lightweight aggregate for structural concrete that dry specific gravity was ranged about 0.9 to 1.4 also the test results of the aggregates showed same physical properties compared with abroad product as 10% granules crushing value from 5 or 10% and absorption percentage from 10 to 20%.

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Foam Generating Characteristics of Lightweight Matrix according to W/B Ratio and Adding Ratio of Polysilicon sludge (W/B 및 폴리실리콘 슬러지의 첨가율에 따른 경량 경화체의 발포 특성)

  • Kim, Yun-Mi;Kim, Won-Jong;Park, Sun-Gyu;Lee, Sang-Soo
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2014.11a
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    • pp.171-172
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    • 2014
  • This is an experimental study on manufacturing of non-cement matrix. Materials like cement and blowing agent in foamed concrete is replaced by by-products from blast furnace slag and paper ash. Sample 43-PS-1 with density showed lowest. The compressive strength test result, showed a similar trend with density. And it showed that compressive strength of the 40-PS-1 was highest.

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Characteristics of Inorganic Phosphorus Fractions Accrued from the Application of paper Mill Sludge Compost in Naked Soil(I) (제지슬러지퇴비를 시용한 나지 토양의 무기태인산의 특성변화(I))

  • Lim, Hyun-Taek;Chang, Ki-Woon
    • Journal of the Korea Organic Resources Recycling Association
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    • v.8 no.3
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    • pp.104-111
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    • 2000
  • The study war carried out to evaluate the characteristics of inorganic phosphate factions in soil mixed with paper mill sludge compost(PMSC). The experiments were conducted by an incubation test. For the incubation test, application rates of PMSC to soil were 0, 2, 8, and 16%. Water content of the samples mixed with PMSC were adjusted to 10% and 15% and incubating temperatures of the samples were kept at $4^{\circ}C$ and $30^{\circ}C$, respectively. The results can be concluded as follows; pH increased depending on the higher rates of PMSC application to the soil during the incubation tests, because calcium content was $4.9cmol_c/kg$ and contents of nutrients were high. When the application rates of PMSC were increased Saloid-P and Fe-P decreased, while Al-P and Ca-P in soil increased during the incubation tests.

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Application of Paper Sludge Ash-Stabilized Soft Ground for Subgrade Soil (제지애쉬 고화제로 안정처리된 연약지반의 도로노상토 적용에 관한 연구)

  • Shin, Eunchul;Park, Sooyoung
    • Journal of the Korean GEO-environmental Society
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    • v.19 no.6
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    • pp.13-22
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    • 2018
  • The southwestern part of Korean Peninsula, which length is about 13,000 km, is largely formed with soft cohesive soil ground and when it is developed, the low bearing capacity and excessive settlement of soft ground give many problems. In particular, a lot of clayey soil is deserted due to high moisture content and weakness, and areas formed with soft ground. In this study it was performed unconfined compression test, CBR tests, laboratory frost heaving test, and wheel tracking test in order to determine the optimum mixture ratio of paper sludge ash added chemical stabilizer with soft soil for consideration of its frost heaving and strength characteristics. As a results of the above experiments, when the soft soil is mixed with 6% of chemical stabilizer to improve the soft soil for utilizing as a subgrade soil material. It is satisfied the quality standard of fill materials, and the results of this research are expected to be used as an appropriate usage standard for utilization of on-site soil generated.

Kraft Lignin Biodegradation by Dysgonomonas sp. WJDL-Y1, a New Anaerobic Bacterial Strain Isolated from Sludge of a Pulp and Paper MillS

  • Duan, Jing;Liang, Jidong;Wang, Yiping;Du, Wenjing;Wang, Dongqi
    • Journal of Microbiology and Biotechnology
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    • v.26 no.10
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    • pp.1765-1773
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    • 2016
  • Wastewater containing kraft lignin (KL) discharged from pulp and paper industries could cause serious environmental contamination. Appropriate effluent treatment is required to reduce the pollution. Investigations on anaerobic bacteria capable of degrading KL are beneficial to both lignin removal and biofuel regeneration from the effluent. In this paper, an anaerobic strain capable of degrading KL was isolated from the sludge of a pulp and paper mill and identified as Dysgonomonas sp. WJDL-Y1 by 16S rRNA analysis. Optimum conditions for KL degradation by strain WJDL-Y1 were obtained at initial pH of 6.8, C:N ratio of 6 and temperature of 33℃, based on statistical analyses by response surface methodology. For a 1.2 g/l KL solution, a COD removal rate of 20.7% concomitant with biomass increase of 17.6% was achieved after 4 days of incubation under the optimum conditions. After the treatment by strain WJDL-Y1, KL was modified and degraded.

Trends of phosphorus recovery technology from sewage sludge ash by wet chemical method (습식 화학적 방법에 의한 하수 슬러지 소각재에서의 인 회수 기술동향)

  • Lee, Min-Su;Kim, Dong-Jin
    • Journal of Korean Society of Water and Wastewater
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    • v.32 no.2
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    • pp.131-143
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    • 2018
  • Phosphorus (P) is a limited, essential, and irreplaceable nutrient for the biological activity of all the living organisms. Sewage sludge ash (SSA) is one of the most important secondary P resources due to its high P content. The SSA has been intensively investigated to recover P by wet chemicals (acid or alkali). Even though $H_2SO_4$ was mainly used to extract P because of its low cost and accessibility, the formation of $CaSO_4$ (gypsum) hinders its use. Heavy metals in the SSA also cause a significant problem in P recovery since fertilizer needs to meet government standards for human health. Therefore, P recovery process with selective heavy metal removal needs to be developed. In this paper some of the most advanced P recovery processes have been introduced and discussed their technical characteristics. The results showed that further research is needed to identify the chemical mechanisms of P transformation in the recovery process and to increase P recovery efficiency and the yields.

Sensitivity Analysis and Parameter Estimation of Activated Sludge Model Using Weighted Effluent Quality Index (가중유출수질지표를 이용한 활성오니공정모델의 민감도 분석과 매개변수 보정)

  • Lee, Won-Young;Kim, Min-Han;Kim, Young-Whang;Lee, In-Beum;Yoo, Chang-Kyoo
    • Journal of Institute of Control, Robotics and Systems
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    • v.14 no.11
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    • pp.1174-1179
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    • 2008
  • Many modeling and calibration methods have been developed to analyze and design the biological wastewater treatment process. For the systematic use of activated sludge model (ASM) in a real treatment process, a most important step in this usage is a calibration which can find a key parameter set of ASM, which depends on the microorganism communities and the process conditions of the plants. In this paper, a standardized calibration protocol of the ASM model is developed. First, a weighted effluent quality index(WEQI) is suggested far a calibration protocol. Second, the most sensitive parameter set is determined by a sensitive analysis based on WEQI and then a parameter optimization method are used for a systematic calibration of key parameters. The proposed method is applied to a calibration problems of the single carbon removal process. The results of the sensitivity analysis and parameter estimation based on a WEQI shows a quite reasonable parameter set and precisely estimated parameters, which can improve the quality and the efficiency of the modeling and the prediction of ASM model. Moreover, it can be used for a calibration scheme of other biological processes, such as sequence batch reactor, anaerobic digestion process with a dedicated methodology.

Appropriate Sewerage Systems for Korea (우리나라 적합 하수도시설 및 관리방안)

  • 이상은
    • Journal of environmental and Sanitary engineering
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    • v.7 no.2
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    • pp.37-52
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    • 1992
  • Since the first sewage treatment plant was constructed in 1976, the sewerage systems of Korea have been rapidly expanded. As of the end of 1991, 22 sewage treatment plants with total capacity of 5.4 million tons/day are in operation which is equivalent of 3395 total daily sewage generation. Total extension of sewer 39.534 km in 1990 which is 55% of the target extension for the year 2001. However, the most sewage treatment plants employ activated sludge process which may not be suitable for medium and/or small scale plants. The poor existing sewer systems do not effectively collect and transport sewage to adversely affect the function of sewage treatment plant. To select the appropriate treatment system, the cities are classified into 3 categories such as large and medium size inland cities, small size cities and coastal cities. Considering the criteria suggested during this study, appropriate treatment processes were selected for each category. Conventional activated sludge process and step aeration process were found to be the most appropriate for big inland cities while biological nutrient removal processes should be considered for the cities discharge the effluent to lakes or reservoirs. RBC or Oxidation Ditch process might be appropriate for the medium size cities while several processes which do not require skilled operation and maintenance were suggested for the small cities. Ocean discharge after primary treatment can be considered for some east coast cities, Appropriate methodology to rehabilitate the existing sewers and strategy to convert combined sewer system to separate sewer system were proposed. This paper also include the appropriate management system for industrial wastewater, sludge and nightsoil.

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