• 제목/요약/키워드: Sludge recycle

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Application of upflow multi-layer bioreactor (UMBR) for domestic wastewater treatment in HCMC

  • Cao, Duc Hung;Nguyen, Ngoc Han;Nguyen, Phuoc Dan;Bui, Xuan Thanh;Kwon, J.C.;Shin, H.S.;Lee, E.T.
    • Membrane and Water Treatment
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    • v.3 no.2
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    • pp.113-121
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    • 2012
  • Up-flow multi-layer bioreactor (UMBR) is a hybrid system using dual sludge that consists of an up-flow multi-layer bioreactor as anaerobic/anoxic suspended growth microorganisms followed by an aeration tank. The UMBR acts as a primary settling tank, anaerobic/anoxic reactor, thickener which requires low energy due to mixing by up-flow stream. This study focused on using a pilot UMBR plant with capacity of 20-30 $m^3$/day for domestic wastewater in HCMC. HRTs of UMBR and aeration tank were 4.8 h and 7.2 h, respectively. The average MLSS of UMBR ranged from 10,000-13,600 mg/l SS. Internal recycle rate and sludge return were 200-300% and 150-200%, respectively. The results obtained from this study at flow rate of 20 $m^3$/day showed that removal of COD, SS, TKN, N-$NH_4$, T-N, and color were 91%, 87%, 86%, 80%, 91% and 91%, respectively.

Pilot Scale Test of Non-woven Fabric Filter Separation Activated Sludge Process for Practical Application on Domestic Wastewater Reclamation (파일럿 규모의 침지식 부직포 여재 활성슬러지 공정의 시스템 처리 특성에 관한 연구)

  • Lee, Sang-Woo;Choi, Chul-hoi;Park, Young-mi;Seo, Gyu-Tae
    • Journal of Korean Society of Water and Wastewater
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    • v.20 no.2
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    • pp.289-294
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    • 2006
  • A pilot scale non-woven fabric filter separation activated sludge system was investigated for practical application on domestic wastewater reclamation and reuse. The system was operated in A/O (Anaerobic/Oxic) process with submerged filter module in the aerobic compartment. In the test of two types of filter materials ($70g/m^2$ and $35g/m^2$), the initial flux (0.42m/d) could be maintained for about three months by regular air backwashing of $70g/m^2$ filter at 0.3m water head. The removal efficiency of organic matter by the system was BOD 93.3%, CODcr 96.3%, SS 96.7%. The effluent quality was 7.8mg/L, 12mg/L and 5mg/L for BOD, CODcr and SS, respectively. The water quality was enough to meet a standard for domestic reuse without human contact. T-N removal efficiency was 49.9% at internal recycle rate 2Q and C/N ratio 3.3. The removal efficiency of T-P was 50% with average effluent concentration, 2.6mg/L.

Properties of Eco-Construction Material Using Recycled Sewage Sludge Ash (하수슬러지 소각재를 재활용한 친환경 건설 소재의 재료적 특성)

  • Jo, Byung-Wan;Lee, Jea-Ik;Park, Seung-Kook;Lee, Jae-Seung
    • Journal of the Korea Concrete Institute
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    • v.19 no.6
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    • pp.667-676
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    • 2007
  • As the 21st century began, cement and concrete that are representatives of modem building materials became a major factor in global warming, air pollution and environmental pollution. Also, the problems that are generated while pursuing high performance and high strength became social issues. Therefore, it has become urgent to prepare counter plans. This study has aimed at the recycling of sewage sludge ash and developing it as a new concept in building material which serves the environmental considerations for long-lasting developmental purpose. Also, the study aimed to find a substitute for scarce natural resources and to secure high techniques for waste recycling. The purpose of this study was also to solve fundamentally secondary environmental pollution. The results revealed that the chemical components of sewage sludge ash are mainly $SiO_2\;and\;Al_2O_3$ which are similar to the components of pozzolan. Also, it was identified that sewage sludge ash can be utilized as a hardened specimen with an alkali activated pozzolan reaction. Considering the possibility of appropriate strength development and the advantage of drying shrinkage, compared with that of cement, it was believed that sewage sludge ash can demonstrate a function as a substitute for cement given.

Recycling of Cutting Oil from Silicon Waste Sludge of Solar Wafer (태양광용 웨이퍼 실리콘 폐슬러지로부터 절삭유의 재생)

  • Um, Myeong-Heon;Lee, Jong-Jib;Ha, Beom Yong
    • Clean Technology
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    • v.22 no.4
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    • pp.274-280
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    • 2016
  • In this study, it was to develop a chemical method that can recycle the cutting oil which accounts for about 25% of the cost of the process among containing materials of silicon waste sludge generated in the process for producing a solar cell wafer. The 7 types of reagents have been used, including acetone, HCl, NaOH, KOH, $Na_2CO_3$, HF, $CH_2Cl_2$, etc. for this experiment. And It was carried out at a speed of 3000 rpm for 60 minutes centrifugation after performing a reaction with a waste sludge at various concentrations. As a result, the best reagents and conditions for separating the solid such as a silicon powder and a metal powder and liquid cutting oil were identified as 0.3 N NaOH. It is found to be pH 6.05 in a post-processing recycled cutting oil with 0.3 N NaOH after reaction of waste sludge and 0.1 N HCl which is effective to remove metal powder in order to adjust the pH to suit the properties of the weak acid is a commercially available cutting oil and it showed excellent turbidity than when applied to sludge with 0.3 N NaOH alone. The results of FT-IR analysis which can compare the properties of the commercially available cutting oil shows it has a possibility of recycling oil. The cutting oil recovery rate obtained through the experiment was found to be 86.9%.

Leaching of Copper and Other Metal Impurities from a Si-Sludge Using Waste Copper Nitrate Solution (실리콘 슬러지로부터 폐질산구리용액을 이용한 구리 및 금속불순물의 침출)

  • Jun, Minji;Srivastava, Rajiv Ranjan;Lee, Jae-chun;Jeong, Jinki
    • Resources Recycling
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    • v.25 no.3
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    • pp.11-19
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    • 2016
  • A fundamental study to recycle a Si-Sludge and waste copper nitrate solution acid solution generated by domestic electronic industries was carried out. The waste copper nitrate solution was used as the lixiviant to leach the metals like Cu, Ca, Fe, etc. from the sludge leaving Si in the residues. The effect of reaction temperature, time and pup density on the metals leaching from the sludge was investigated. To enhance the extractability of Fe, the effect of HCl, $HNO_3$ and $H_2O_2$ introduced additionally during the leaching was also examined. Considering the leaching efficiency of Fe along with Cu, the leaching conditions comprising of 200 ~ 225 g/L pulp density and $90^{\circ}C$ temperature for 30 min were optimized. Under this condition, 98.27 ~ 99.17% Cu could be dissolved in the leach liquor with the obtained purity of Si in the residues as 98.69 ~ 98.86 %. The study revealed that the leaching of Cu contained in the Si-Sludge with the waste copper nitrate solution is a plausible approach by which the obtained leach liquor can further be treated suitably to recover Cu as the high pure value-added products.

Ability of the Natural Abrasives Recovered from Sludge (재활용 천연광물 연마재의 연마성능)

  • Cho, Sung-Baek;Seo, Myeong-Deok;Cho, Keon-Joon;Lee, Su-Jeong
    • Journal of the Mineralogical Society of Korea
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    • v.22 no.4
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    • pp.353-358
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    • 2009
  • The ability of natural abrasives which were recovered from CRT glass polishing process was evaluated. Comparing the center line average roughness values of a glass polished with new pumice (Ra = $0.039{\mu}m$) and with new garnet (Ra = $0.031{\mu}m$), the glass surface polished with the recycled pumice and the garnet had less pits on the surface with smaller Ra values (Ra = $0.025{\mu}m$ for recycled pumice and Ra = 0.029 for recycled garnet). Recycled rouge contains amorphous glass fragments so that it should be used as a cement replacement rather than recycle into an abrasive. Nnatural abrasives, pumice and garnet powder, which are used in CRT glass polishing process can be recycled into abrasives so that it can help to minimize costs and environmental impact from the production of abrasives and the disposal of waste sludge.

A Study on the Production of Landfill-Cover Material Using the Physical Characteristics of Sludge and the Reduction of Odor (슬러지의 물리적 특성을 이용한 매립복토재 생산과 악취저감에 대한 연구)

  • Park, Jung Hyun;Yeo, Woon Ho
    • Journal of the Korea Organic Resources Recycling Association
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    • v.28 no.2
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    • pp.15-29
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    • 2020
  • The aims of this study is to improve physical properties of the sewage sludge and the process sludge generated in the leachate treatment by mixing the dry fuel, to develop the neutral solidifing agents that reduce oder, and to recycle the sewage and the process sludges as landfill cover materials. The mixing ratio (W/W) of sludges and dry fuel was appropriate at about 1:1, and the mixed materials were shown to be homogeneous at that ratio. We could know that when the sludges were mixed with dry fuel, moisture contents and viscosities are reduced, and air passages are formed between particles and particles. The various mixing tests and odor tests showed that the neutral solidifing agent was effective for the odor reduction. The main ingredient of the solidifing agent is the ash of sewage sludge, enabling it competitive in waste recycling and production costs. The landfill cover, using developed neutral solidification agent, improved physical properties to satisfy the quality standards and to increase the compressive strength. It also proved to reduce the value of complex oder and the usage of solidification agent to 1/3 (3,000 to 1,000) and to 1/8 (50% to 6%), respectively, from the comparative study with alkaline solidified landfill cover. Further research is under way to prove that this can be mixed with general soil to be used as a soil improvement agent for plant cultivation.

Comparison of compost product quality with nature soil standard (국내생산퇴비의 부숙토 기준에 대한 적합성 검토)

  • Choi, H.G.;Lee, J.A.;Kim, K.Y.;Lee, K.C.;Lee, J.G.;Park, K.H.;Park, J.S.;Phae, C.G.
    • Journal of the Korea Organic Resources Recycling Association
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    • v.9 no.2
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    • pp.77-86
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    • 2001
  • As construction and expansion of wastewater treatment works is continuing, generation of sludge is increasing. Bur most sludge is not used appropriately but disposed by landfill dumping to sea. Furthermore direct landfilling of sludge cake containing moisture content over 75% has been legally prohibited since 2001 that's enforcement will be more strict in 2003. Such a situation means nowadays recycling of organic waste such as sludge and food waste is necessary. Composting is one of recycling methods commonly and used as an effective means of stabilizing organic waste and then compost can be used as fertilizer. However fertilizer law management which include standard of compost products and other fertilizers applied all sludge products indiscriminiately and was not flexible. So MOE has graded organic composts according to land applications to improve recycle of organic wastes. The classified organic compost which contains low contaminants has been possible to use as various purpose. This study enalyzed 30 samples which were raw materials for compost and compost products management well and to estimate the quality of compost products. Heavy metals were measured in Raw materials and OM/N, NaCl and VS were tested in compost products as well as heavy metals. As a result, approximate 10% of raw materials was not suitable to the grade A and 6.7% over the grade B of the regulation on raw materials for compost. In the case of 30 produced compost propducts approximate, 57% of composts was not compatible with the grade A and B of the regulation on composting product. The qualities of compost products were worse than raw materials, because the compost products have more regulation item raw materials have.

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Analysis of laboratory scale nitriation reactor using sludge thickener supernatant (농축조 상징액을 대상으로한 실험실 규모 아질산화 반응조 분석)

  • Im, Jiyeol;Gil, Kyungik
    • Journal of Wetlands Research
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    • v.17 no.4
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    • pp.414-420
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    • 2015
  • Nitrogen is one of main causes to induce eutrophication of water system and one of contaminants that must be treated for protection of water system. In this study, it was intended to identify a method to increase operation efficiency of municipal wastewater treatment plant (MWTP) by treating high concentration nitrogen. A laboratory scale reactor was operated by using sludge thickener supernatant in the MWTP. During operation of the laboratory scale reactor, it was intended to induce stable nitritation and analyze effects of related operation factors. As results, it was shown that the nitiritation could be induced artificially through control of retention time and sections where the stable nitiritation was induced were identified also. In particular, highly efficient nitrite conversion efficiency near 90% was identified in condition of 1 day retention time. Especially, it was shown that ammonium nitrogen load affected ammonium nitrogen removal efficiency and nitrite conversion efficiency. In the condition of high ammonium nitrogen load, the nitrite conversion efficiency and the ammonium nitrogen removal efficiency decreased. On the contrary in the condition of low ammonium nitrogen load, it was found that the nitrite conversion efficiency decreased. It means that control of ammonium nitrogen concentration and its retention time is needed for the nitritation. It is considered that for the sewage containing high load nitrogen in sludge treatment process as like the sludge thickener supernatant, the nitritation can be applied, which can be suggested as a modification method of MWTP.

Synthesis of LiDAR-Detective Black Material via Recycling of Silicon Sludge Generated from Semiconductor Manufacturing Process and Its LiDAR Application (반도체 제조공정에서 발생하는 실리콘 슬러지를 재활용한 라이다 인지형 검은색 소재의 제조 및 응용)

  • Minki Sa;Jiwon Kim;Shin Hyuk Kim;Chang-Min Yoon
    • Journal of the Korea Organic Resources Recycling Association
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    • v.32 no.1
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    • pp.39-47
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    • 2024
  • In this study, LiDAR-detective black material is synthesized by recycling silicon sludge (SS) that is generated from semiconductor manufacturing process, and its recognition is confirmed using two types of LiDAR sensors (MEMS and Rotating LiDAR). In detail, metal impurities on the surface of SS is removed, followed by coating of titanium dioxide (TiO2) and subsequent chemical reduction to obtain SS-derived black TiO2 (SS/bTiO2) material. As-prepared SS/bTiO2 is mixed with transparent paint to prepare hydrophilic black paints and applied to a glass substrate using a spray gun. SS/bTiO2-based paint shows similar blackness (L*=15.7) compared to commercial carbon black-based paint, and remarkable NIR reflectance (26.5R%, 905nm). Furthermore, MEMS and Rotating LiDAR have successfully detected the SS/bTiO2-based paint. This is attributed to the occurrence of high reflection of light at the interface between the black TiO2 and the silicon sludge according to the Fresnel's reflection principle. Hence, the new application field to effectively recycle silicon sludge generated in the semiconductor manufacturing process has been presented.