• Title/Summary/Keyword: Treated wastewater

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The Effects of Bombyx mori Silk Protein for the Expression of Epithelial Growth factor in the Wound Healing Process of the Hairless Mouse (Hairless mouse의 피부상처 후 실크단백질 처리가 표피성장인자의 발현에 미치는 영향)

  • Han, Sang-Mi;Lee, Kwang-Gill;Yeo, Joo-Bong;Kweon, Hae-Yong;Woo, Soon-Ok;Baek, Ha-Ju;Park, Kwan-Kyu
    • Journal of Sericultural and Entomological Science
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    • v.48 no.2
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    • pp.56-60
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    • 2006
  • This study was performed to investigate the effect of silk protein (BM-1) treatment on epidermal growth factor (EGF) expression in the wound healing process by excision on the hairless mouse. Significant wound healing activity was observed BM-1 treated group. In BM-1 treated groups ($100{\sim}116 ug/day$), epithelialization of the incision wound was laster with a high rate of wound contraction. In expression of EGF and EGF mRNA, the lesion of BM-1 treated group made EGF to more induce significantly than control lesion. These data suggest that silk protein (BM-1) treatment have wound healing effect by excision on the hairless mouse.

Evaluation of biological treatment of cutting-oil wastes using sequencing batch reactor (SBR) process (연속 회분식 반응조 (SBR) 공정을 이용한 폐절삭유의 생물학적 처리능 평가)

  • Baek, Byung-Do;Kim, Chang-Seop;Kim, Jun-Young;Chang, In-Soung
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.10 no.7
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    • pp.1654-1660
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    • 2009
  • Two different cutting-oils from H and B companies which are sold as an eco-friendly cutting-oils were selected and the biodegradability of these commercially available cutting-oils was evaluated by the sequencing batch reactor (SBR) processes. The cutting-oil wastes ($H_1$) pre-treated by coagulation/flocculation was used as an influent to SBR. When the F/M ratio was operated 0.04 to 0.08kgCOD/kgMLSS d, removals of $BOD_5$and $COD_{Cr}$were above 97% and 91%, respectively. T-N and T-P removals were above 76% and 81%, respectively. If the diluted cutting-oil wastes ($B_1$) was used as an influent of the SBR, $COD_{Cr}$removals were above 77% at the F/M ratio of 0.01-0.02kgCOD/kgMLSS d. After the cutting-oil wastes was treated by coagulation/ flocculation ($B_2$), $COD_{Cr}$removals was above 85%. If the pre-treated cutting-oil wastes were mixed with a synthetic wastewater ($B_3$) and fed into the SBR in order to mimic the real wastewater treatment plant situation, $BOD_5$and $COD_{Cr}$removals were above 97%, 91%, respectively. T-N and T-P removals were above 79% and 76%. The ratio between $BOD_5$and $COD_{Cr}$, ($COD_{Cr}$-$BOD_5$)/$COD_{Cr}$, indicating the biodegradability of effluent of the SBR, was calculated to 85% and 61%. This means that significant amounts of non-readily-biodegradable organic compounds in the effluent of $H_1$, $B_3$are still present.

Effect of Seeding and Mixing Conditions on Struvite Crystallization (Seeding 및 혼합조건이 Struvite 형성에 미치는 영향)

  • Kim, Jin-Hyoung;Kim, Dae-Keun;Kang, Joo-Hyoung;Lee, Sang-Ill
    • Journal of Korean Society of Environmental Engineers
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    • v.29 no.3
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    • pp.325-331
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    • 2007
  • This study was aimed to find out methods for preventing scale formation from the struvite treated water, and improving ammonium nitrogen removal efficiency in the application of struvite crystallization for ammonium fluoride wastewater wastement. During the struvite mystallization seeding effects varied with G.td value applied as mixing conditions in the experiment. The removal efficiency of ammonium nitrogen$(NH_4^+-N)$ and phosphorus$(PO_4^{3-}-P)$ increased over 90% in the condition of low $G{\cdot}t_d$ value. In the experiment with seeding, $G{\cdot}t_d$ value was shown to decease four times lower than the one without seeding. When adding over 2% seeding materials in the total water volume, ammonium nitrogen removal efficiencies gradually increased, of which observation was also revealed in a paired-sample T-test with 95% reliability.

Characterization of $NH_4\;^+$ and $Zn^{2+}$ Adsorption by Korean Natural Zeolites (한국산(韓國産) 천연(天然) 제오라이트의 암모늄과 아연이온의 흡착(吸着)특성)

  • Kang, Shin-Jyung
    • Applied Biological Chemistry
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    • v.32 no.4
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    • pp.386-392
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    • 1989
  • The adsorption of $NH_4\;^+$ and $Zn^{2+}$ by four Korean zeolites, the major species of which are clinoptilolite, clinoptilolite with mordenite, mordenite with clinoptilolite, and mordenite was measured in different concentrations of solutions of $NH_4\;^+$ and $Zn^{2+}$, and their mixtures. The adsorption of $NH_4\;^+$ was greater than that $Zn^{2+}$ far all samples at the concentrations of the added solutions from $1\;to\;7{\times}10^{-3}N$ and this difference was greater at the higher concentrations. Also, $Zn^{2+}$ adsorption by samples was decreased by the presence of $NH_4\;^+$, but that of $NH_4\;^+$ by the presence of $Zn^{2+}$ was not. The extent of $NH_4\;^+$ selectivity among samples was increased in order of clinoptilolite with mordenite$NH_4\;^+$ adsorbed by six successive equilibrations with the solution containing both $NH_4\;^+$ and $Zn^{2+}$ each at a concentration of $3{\times}10^{-3}N$ were in range from 43.7 to 50.4 me/100g, whereas those amounts of $Zn^{2+}$ were in the range from 6.6 to 17.0 me/100g. It was suggested from these results that mordenite and clinoptilolite, particularly the former, can be used for removal of $NH_4\;^+$ from municipal wastewater and those zeolites treated with wastewater can be applied to agricultural land.

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State and Prospects of Organic Waste Composting in Korea (유기성 폐기물의 자원화 가능성 및 퇴비 이용 전망 평가)

  • Shin, Hang-Sik;Hwang, Eung-Ju
    • Journal of the Korea Organic Resources Recycling Association
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    • v.6 no.2
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    • pp.7-30
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    • 1998
  • Generation and recycling potential of organic waste in Korea were estimated. Status of organic waste composting and compost utilization also were surveyed to promote the recycling of organic waste. From 1994 to 1997, generation of garbage decreased gradually while recycling rate increased due to positive governmental strategy. During the same period, livestock waste increased 11.2%. Municipal wastewater sludge was generated 3,500 ton/day which was 0.03% of wastewater treated in 1996. The energy Potential of industrial organic waste was estimated to 288 million TOE which was 1.75% of the nationwide first energy consumption in 1996. Recycling of industrial sludge was low to 31%, while recycling of animal waste, plant scraps, and wasted paper were relatively high over 50%. Industrial sludge should be recycled more as it was the most part of industrial organic waste. Conventional composting materials were mainly livestock waste, food processing waste, fishery waste, sawdust, and nightsoil. Garbage and sludge have been composted recently. 420,000 tons of compost in 1996 were produced by 288 makers, the most of which were utilized in agriculture. It was suggested that separated collection, compost standard, and quality management should be provided to promote the composting of organic waste.

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Effects of Substrate to Inoculum Ratio on Biochemical Methane Potential in Thermal Hydrolysate of Poultry Slaughterhouse Sludge (기질과 접종액의 비율이 도계 가공장 슬러지 열가수분해액의 메탄생산퍼텐셜에 미치는 영향)

  • Oh, Seung-Yong;Yoon, Young-Man
    • Korean Journal of Environmental Agriculture
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    • v.35 no.2
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    • pp.121-127
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    • 2016
  • BACKGROUND: Anaerobic digestion is the most feasible technology because not only the energy embedded in organic matters can be recovered, but also they are stabilized while being degraded. This study carried out to improve methane yield of slaughterhouse wastewater treatment sludge cake by the thermal pre-treatment prior to anaerobic digestion.METHODS AND RESULTS: Slaughterhouse wastewater treatment sludge cake was pre-treated by the closed hydrothermal reactor at reaction temperature of 190℃. BMPs (Biochemical methane potential) of the thermal hydrolysate was tested in the different S(Substrate)/I(Inoculum) ratio conditions. COD(Chemical oxygen demand) and SCOD(Soluble chemical oxygen demand) contents of thermal hydrolysate were 10.99% and 10.55%, respectively, then, the 96.00% of COD was remained as a soluble form. The theoretical methane potential of thermal hydrolysate was 0.51 Nm3 kg-1-VSadded. And BMPs were decreased from 0.56 to 0.22 Nm3 kg-1-VSadded when S/I ratio were increased from 0.1 to 2.0 in the VS content basis. Those were decreased from 0.32 to 0.13 Nm3 kg-1-CODadded when S/I ratio were increased from 0.1 to 2.0 based on COD content. The anaerobic degradability of VS basis have showed 196.9%, 102.2%, 80.7%, 67.4%, and 39.4% in S/I ratios of 0.1, 0.3, 0.5, 1.0, and 2.0, respectively. Also the COD of 119.6%, 76.3%, 70.1%, 69.0%, and 43.1% were degraded anaerobically in S/I ratios of 0.1, 0.3, 0.5, 1.0, and 2.0, respectively.CONCLUSION: BMPs obtained in the S/I ratios of 0.1 and 0.3 was overestimated by the residual organic matters remaining at the inoculum. And inhibitory effect was observed in the highest S/I ratio of 2.0. The optimum S/I ratios giving reasonable BMPs might be in the range of 0.5 and 1.0 in S/I ratio. Therefore VS biodegradability of thermal hydrolysate was in 67.4-80.7% and COD biodegradability showed 69.0-70.1%.

Removal Characteristics of Nitrogen and Phosphorus in swine wastewater by Using Acetic acid on the SBR Process (SBR에서 아세트산을 이용한 양돈폐수의 질소·인 제거 특성)

  • Huh, Mock;Kang, Jin-Young
    • Journal of the Korea Organic Resources Recycling Association
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    • v.12 no.1
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    • pp.84-93
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    • 2004
  • This study was performed : 1) to find the suitable HRT(hydralic retention time), 2) to evaluate the effects of the ratio of mixing/aeration time and injection time of external carbon source, for the removal of organics, nitrogen and phosphorus in swine wastewater by SBR(sequencing batch reactor process), which is one of the biological treatment process. The result of this study were summarized as follows : (1) As the ratio of mixing/aeration time was higher, $NH_4{^+}-N$ removal efficiency was increased and it was increased with increasing injection time of external carbon source because nitrification was affected by denitrification microbes propagation when injection time of external carbon soruce was shorted. T-N removal efficiency was increased with increasing the ratio of mixing/aeration time and injection time of external carbon source. (2) The T-P removal efficiency showed a great difference in each operating condition, and it was increased with increasing the ratio of mixing/aeration time increased and when the injection time of external carbon source was shorted because denitrification was done with effect by denitrification microbes propagation. (3) The highest removal efficiency of organic and nitrogen were obtained by the operating condition of Run 4-1(the ratio of mixing/aeration time : 16.5/5.5, injection time of external carbon source : 15hours) and T-P were obtained by the operation condition of Run 4-2(the ratio of mixing/aeration time : 16.5/5.5, injection time of external carbon source : 3hours), and efficiency(effluent concentration)of $BOD_5$, $COD_{Mn}$, $COD_{Cr}$, T-N and T-P in the treated water was 96.1%, 87.7%, 90.6%, 86.6% and 84.5%, respectively.

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Removal of Ammonia-Nitrogen Contained in Landfill Leachate by Ammonia Stripping(I) (암모니아 탈기공정을 이용한 침출수의 암모니아성 질소제거(I))

  • Lee, Byung-Jin;Cho, Soon-Haing
    • Journal of Korean Society of Environmental Engineers
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    • v.22 no.10
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    • pp.1893-1904
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    • 2000
  • Nitrogen compounds are one of the major pollutants which cause eutrophication problems of the river or lake and red tides problems of the ocean. Currently available technologies for the removal of nitrogen compounds are mostly biological treatment. However, biological treatment is only effective for the wastewater which contains low concentration of nitrogen compounds. Leachate from solid waste landfill or industrial wastewater which contains high concentration of nitrogen can not be effectively treated by most of the currently available biological treatment technologies. With this connection. the objective of this study is to examine the applicability of ammonia stripping technology for the removal of high concentration of ammonia nitrogen compounds of the leachate from solid waste landfill. It can be concluded that ammonia stripping technology which was placed before the biological treatment process was very effective for the removal of high concentration of ammonium compounds. The chemical cost for the ammonia stripping was 16 percent higher than MLE process, so other methods like sludge recycling are needed for the reduction of operation cost. Further details are discussed in this paper.

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Sludge Solubilization by Pre-treatment and its Effect on Methane Production and Sludge Reduction in Anaerobic Digestion (전처리 방법에 따른 슬러지 가용화가 혐기소화에서 메탄 생산과 슬러지 감량에 미치는 영향)

  • Kim, Dong-Jin;Kim, Hye-Young
    • Korean Chemical Engineering Research
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    • v.48 no.1
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    • pp.103-109
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    • 2010
  • Anaerobic digestion has been widely used for the treatment of sludge, which is generated from the municipal and industrial wastewater treatment, for its volume reduction and methane production. Many researches on sludge pre-treatment have been carried out in order to enhance the performance of anaerobic digestion by increasing the hydrolysis of sludge which is the rate limiting step of anaerobic digestion. In this study, the effect of pre-treatment on sludge hydrolysis(solubilization), methane production and sludge reduction by anaerobic digestion after thermal, ultrasonic, and thermal-alkali sludge treatment were compared. Thermal-alkali treatment showed 67 and 70% solubilization with municipal and industrial wastewater sludge, respectively, while ultrasonic treatment and thermal treatment gave similar solubilization efficiency of 40% or more. Methane content of the anaerobic digestion gas reached 45~70% and pretreated sludge gave higher methane content than the control sludge. Methane production of thermal, ultrasonic, and thermal-alkali pre-treatment gave 2.6, 2.7, 3.5 times of municipal control sludge and 3.5, 4.1, 4.2 times of industrial control sludge, respectively. Sludge reduction of pre-treated sludge after anaerobic digestion gave 5~19% point higher than that of control sludge, and thermal-alkali treatment showed higher reduction efficiency than thermal and ultrasonic treatment. The results proved that pre-treatment contributed significantly not only for the methane production but also for the cost reduction of sludge treatment and disposal, and thermal-alkali treatment gave the best performance for the sludge treatment.

Reuse Technology Development and Economic Evaluation of Dyeing Wastewater Treatment Sludge (폐수처리슬러지의 재활용기술개발 및 경제성 평가 -B염색조합을 중심으로-)

  • 임재호;이정연
    • Resources Recycling
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    • v.9 no.1
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    • pp.36-43
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    • 2000
  • This study was carried out for treatment and reuse of inorganic sludge from Fenton process at B dyeing wastewater treatment plant. The parameters for pilot-scale treatment system were derived from the results of this study. It was found that $COD_{cl}$ of the treated effluent became lower than 100 mg/l approximately on the optimal reaction condition. 2nd sludge which was generated after redissolving sludge was analyzed, and it showed that reduction ratio of ash in 2nd sludge and total dry sludge weight in comparison with current sludge were 85% and 65%. Also Fe salt in sludge was redissolved about 90~95% of initial Fe by weight. It was estimated almost ₩350,000,000 for sludge reuse process. It was estimated saving of about ₩1,300,000 per day (₩420,000,000 per year) in operating cost based on 30,000 $m^3$/d treatment, which these were about ₩430,000 per day in chemical, ₩1,100,000 per day in sludge transportation and ₩200,000 per day in equipment maintenance. Payback period with interest charge for investment cost was estimated about 10.5 months. Also, net present value (NPV) was ₩792,000,000 and internal rat of return (IRR) was about 110%.

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