• Title/Summary/Keyword: sludge water

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Treatment and Disposal of tow-level Radioactive Sludges by Solar Evaporation

  • Lee, Sang-Hoon
    • Nuclear Engineering and Technology
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    • v.4 no.3
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    • pp.194-202
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    • 1972
  • In this investigation, a solar evaporation method was studied to reduce the water content of the radioactive sludge produced from the clay adsorption liquid waste treatment. The solar method to form sludge cake from sludge slurry could economically reduce the sludge volume and the operation cost of minimum 8% could be curtailed.

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A Study of Effective Discharge Method for Sedimentation Sludge (침전슬러지의 효율적인 배출방안에 관한 연구)

  • Oh, Sueg-Young;Byun, Doo-Gyoon
    • The KSFM Journal of Fluid Machinery
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    • v.8 no.2 s.29
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    • pp.16-22
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    • 2005
  • This research inspects the discharge state for inside of sedimentation basin, and, through the aboard literature and data, examine sedimentation sludge about discharge plan of effective sedimentation sludge that can discharge in state of high concentration. In this study, we are going to attempt an economy with improvement efficiency for discharge of sedimentation sludge in a water treatment plant.

Study on Bio-H2 Production from Synthetic Food Waste and Activated Sludge from Industrial Waste Water Processes using Dark-fermentation (산업공정의 폐수처리에서 발생된 폐활성슬러지 및 인공음식폐기물을 이용한 생물학적 수소생성에 관한 연구)

  • Kim, Tae-Hyeong;Kim, Mi-Hyung;Lee, Myoung-Joo;Hwang, Sun-Jin;Eom, Hyoung-Choon
    • Journal of Korean Society of Water and Wastewater
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    • v.24 no.6
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    • pp.703-712
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    • 2010
  • This study performed to extract operation factors of major organic wastes, which were food wastes and waste activated sludge generated in industries in order to use them as a substrate for bio-H2 production. According to the results of experimental analysis for hydrogen production capacity by various organic concentrations, the hydrogen production yield was the highest at 80 g/L, and the efficiency was improved by the pretreatment of waste activated sludge (acid treatment, alkali treatment). Hydrogen production efficiency was improved by mixing food wastes and waste activated sludge if waste activated sludge was below than 30%, however, it was decreased when it was more than 50%. The impacts of heavy metals on the hydrogen production shows that the inhibition level depends on the concentration of Cr, Zn, and Cu, Fe was able to enhance the hydrogen production.

Development and Performance Evaluation of Electrodewatering System for Sewage Sludge Recycling

  • Lee, Jae-Keun;Lee, Jung-Eun;Shin, Hee-Soo;Park, Chan-Jung;Lee, Chang-Gun;Kim, Young-Hwan;Kim, Man-Jong
    • Proceedings of the IEEK Conference
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    • 2001.10a
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    • pp.443-447
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    • 2001
  • A laboratory-scale electrodewatering system for enhancing conventional filter pressure dewatering by an electric field has been developed to decrease the water content of sludge generated in the wastewater treatment. It consists of a piston-typed filter press, a power supply and data acquisition system. The offset of electrodewatering is investigated as a function of applied pressure, applied voltage, sludge type and filtration time. Also the optimal conditions for maximizing the dewatering efficiency in the eletrodewatering system are investigated. Electric field strength and mechanical pressure are in the range of from 0 to 120 V/cm and from 98.1 to 392.4 kPa. The dewatering rates increased with increasing electric strength. These experiments produced a final sludge cake with water content of 60 wt% using electrodewatering technology, compared with a 80 wt% using pressure filtration alone. The conventional filtration system using the electrodewatering shows the potential to be effective method for improving dewatering Sludge.

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Comparative Study Between Geopolymer and Cement Waste Forms for Solidification of Corrosive Sludge

  • Lee, Juhyeok;Kim, Byoungkwan;Kang, Jaehyuk;Kang, Jaeeun;Kim, Won-Seok;Um, Wooyong
    • Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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    • v.18 no.4
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    • pp.465-479
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    • 2020
  • Two waste forms, namely cement and geopolymer, were investigated and tested in this study to solidify the corrosive sludge generated from the surface and precipitates of the tubes of steam generators in nuclear power plants. The compressive strength of the cement waste form cured for 28 days was inversely proportional to waste loading (24.4 MPa for 0wt% to 2.7 MPa for 60wt%). The corrosive sludge absorbed the free water in the hydration reaction to decrease the cementation reaction. When the corrosive sludge waste loading increased to 60wt%, the cement waste form showed decreased compressive strength (2.7 MPa), which did not satisfy the acceptance criteria of the repository (3.45 MPa). Meanwhile, the compressive strength of the geopolymer waste form cured for 7 days was proportional to waste loading (23.6 MPa for 0wt% to 31.9 MPa for 40wt%). The corrosive sludge absorbed the free water in the geopolymer when the water content decreased, such that a compact geopolymer structure could be obtained. Consequently, the geopolymer waste forms generally showed higher compressive strengths than cement waste forms.

Recovery of Aluminium Coagulants from Water Treatment Plant Sludges (정수 슬러지로부터 알루미늄 응집제의 회수에 관한 연구)

  • Lee, Jae-Bok;Hwang, Jeong-Wuk;Kim, Jin-Jae
    • Journal of Korean Society of Water and Wastewater
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    • v.12 no.3
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    • pp.30-40
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    • 1998
  • Increasing water consumption produced sludge problems of the water treatment plants. The objective of this study is to investigate aluminium coagulants recovery n acidic and alkaline conditions. Water treatment plant sludge produced in Pusan Metropolitan City were tested for the aluminium extraction process. Experiment samples were obtained in summer from water treatment plants of Deoksan and Myongjang. Aluminium coagulants used in these plants during the test period were polyaluminium chloride(PAC), polyaluminium sulfate organic(PSO), polyaluminium sulfate silicate(PASS). Aluminium contents of water treatment sludge were in the range of 7.2~10.9% of the total solids. The recovery percentages for aluminium and iron by acidic extraction method was evaluated to 88% and 42% respectively. Extracted mass variation for other materials such as iron, manganese, total organic carbon was observed during the extraction operation. Alkaline extraction produced more than two times amount of total organic carbon than that in the acidic extraction process.

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Memtrane SEparation of Activated Sludge for Waste Water Treatment and Water Recycle

  • Miyano, O-Tadadki;Yohgi Inoue;Toyozo Hamada;Shuji Nakatsuka
    • Proceedings of the Membrane Society of Korea Conference
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    • 1999.10a
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    • pp.39-39
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    • 1999
  • Membrane separation technology has become a more attractive technology on waste water treatment and water recycle in recent years. On this application, membrane does not take main part of treatment, such as decomposition or handling of organic matter in the waste water, but it is very important supporting method in the total system. Activated sludge is most popular method as main part. In the system , membrane works as a separator to obtain clear water after biological treatment, by which the permeate could be released, recycled or applied to further additional treatment, instead of conventional sedimentation, coagulation and sand filtration. We would like to introduce our system cases for waste water treatment and water recycle, in which membrane separation technology works. In most of cases, membranes are applied to solid- liquid separation of activated sludge. Our experiences will be introduced as following items.

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The Study on the Dewaterability Improvement of Water Treatment Sludge Using Powdered Waste Oyster Shells (분말 폐굴껍질을 이용한 정수슬러지의 탈수 개선방안)

  • Moon, Jong-Ik;Choi, Sung-Moon;Lim, Young-Seok;Sung, Nak-Chang;Kim, Chul;Kwak, Young-Kyu
    • Journal of Environmental Health Sciences
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    • v.27 no.2
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    • pp.17-21
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    • 2001
  • The object of this study is to find out the characteristics of waste oyster shells and determine the proper dosage of powdered waster oyster shells as the conditioning agent for water treatment sludge dewatering process. The large amount of waste oyster shells which discharges from the oyster farming, occurs serious environmental hazards. However, oysters shell contain large amount(about 38% by weight) of alkaline minerals, such as calcium and magnesium and so on, this natural material is thought to have the petential ability as a good conditioning agent. The results of this study are as follows. The optimum condition for improvement of the water treatment sludge dewaterability is when 6 g of waste oyster shell powder added to 200$m\ell$ of water treatment sludge. At optimum condition, the solid contents can reach to 31.78% and the specific resistance of conditioned sludge is 0.16$\times$10$^{8}$ sec$^2$/g. However, exceeding the of powdered waste oyster shell is needed to get the effective result. Consequently, the waste oyster shell can be a recyclable material to improve the dewaterability of water treatment sludges.

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Enhancement of Sludge Dewaterability using a Starfish and the Radiation Technology (전자선과 불가사리 분말을 이용한 하수슬러지 탈수능 향상)

  • Yu, Dae Hyeon;Lee, Jae Gwang;Lee, Myeon Ju
    • Journal of Environmental Science International
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    • v.13 no.7
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    • pp.681-687
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    • 2004
  • This study was focused on the manufacturing method of a dewatering aid, which would reduce the water content of the sludge cake by enhancing the dewaterability of sewage sludge. The pretreatment technology for sludge by using radiation and among diverse discarded resources were starfish selected as the material to manufacture the dewatering aid. Starfish went through the process of washing, drying, and pulverizing. The starfish powder made in this process was applied to the digested sludge generated at the sewage treatment plant of D City, and its effects were investigated. The starfish powder that was 300 ${\mu}m$ in particle size was added to the irradiated digested sludge. After the application of the condensation process, the sludge with the starfish powder added was dewatered using the belt press and centrifuge, which were the traditional pressure dewatering devices. As the result, it reduced the water content of the sludge 20% higher than the dewatered cake with no dewatering aid added and irradiation. When the powder was added, it contributed to less use of the coagulant added. The more irradiation dose, the lower water content did the dewatered cake have and the more coagulant was needed for condensation, which seems to be a disadvantage that can be compensated for by the starfish dewatering aid. A small-scaled treatment of the study to a radiation technology and dewatering aid using a discarded resource confirmed the potential of dewaterability. Based on the results saying that the dewatering aid and radiation technology can improve dewatering effects using the traditional dewatering devices, this pretreatment technology will be expected to be applied to sewage treatment plants.

A Study on the Artificial Culture Soil Using Alum Sludge (정수장슬러지(Alum sludge)를 이용한 인공배양토 개발에 관한 연구)

  • Koo, Ja-Kong;Lim, Jae-Shin;Moon, Yong-Taik;Lee, In-Bog
    • Journal of the Korea Organic Resources Recycling Association
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    • v.7 no.1
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    • pp.1-12
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    • 1999
  • The objective of this study is to improve the function of an artificial culture soil which was mixed mainly with alum sludge. The artificial culture soil was more efficient than the commercial culture soil for the growth of perennial ryegrass and bush clover. Artificial culture soil was prepared paper sludge(40%), alum sludge(30%), sewage sludge(20%), and compost (10%). This artificial culture soil had no adverse effect on phytotoxicity tests. The alum sludge gives some water holding capacity and cohesion strength to the soil enought to require no other addition of adhesive agents. The leaching of aluminum from the alum sludge was negligible even at very low pH(=2) due to the mixed compost.

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