• Venture DIGEST
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• s.108
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• pp.46-46
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• 2007

마음 깊이 두고 조금씩 실천해가는‘부지런함과 희생’의 결과는 뭘까? 여기 그 과정을 보여주는 기업이 있다. 독자적 기술로 만든 컴퓨터 운영체계를 갖고 싶어 연구를 시작했고 그 속에서 많은 어려움을 겪었지만, 현재를 있게 한 열정과 패기에 SVI의 노하우와 경험을 더해 더욱 새롭고 알찬 미래를 그리는 스노드롭소프트(대표 이상언)를 만났다.

• Venture DIGEST
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• s.109
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• pp.47-47
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• 2007

솔루션 개발 중에서 Payment 분야의 OLTP(Online Transaction Processing) 및 정산 개발, Payment 기술을 활용한 Mobile Payment 솔루션 개발에 전력을 모으는 그린씨엔티(대표 심재범)는 지난 2006년에 창업한 신생기업이다. 하지만 신생기업 답지 않은 기술력과 전략으로 전문기업으로 성장하고 잇는 그린씨엔티를 방문했다.

• Venture DIGEST
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• s.115
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• pp.20-20
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• 2008

STA(Software Testing Alliance)는 사명 그대로 소프트웨어(SW) 테스팅 전문기업이다. 이 회사는 SW 품질향상을 위한 테스팅 분야에서 관련 서비스를 제공하는 '테스팅관리 자동화 지원 도구 보급', '테스트 컨설팅', '테스팅 교육 서비스'등 SW테스팅 전반에 걸쳐 사업을 전개하고 있다.

• Venture DIGEST
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• s.110
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• pp.47-47
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• 2007

양질의 삶을 누리고자 하는 사람들의 관심이 웰빙, 로하스 등의 문화를 만들며 그야말로 웰빙 제품의 홍수에 살고 있다 해도 부족함이 없는 시대이다. 다양한 제품 중 먹거리는 단연 관심 대상 0순위. 건강에 직접적으로 영향을 미치기도 하지만 식재료 하나에 담긴 영양을 몸에서 그대로 느끼고자 하는 욕망이 그 문화의 배경이라 할 수 있다. 창업과 동시에 높은 호응으로 상승세를 이어가고 있는 카르마젠(대표 이수영)을 찾았다.

• Environmental Engineering Research
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• v.17 no.3
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• pp.139-144
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• 2012

In this study, the effects of starvation on floc characteristics when treating saline wastewater using a sequencing batch reactor (SBR) were investigated. The effectiveness over 5 days of starvation for aerobic and non-aerobic strategies for maintaining the physical characteristics of floc-forming sludge and the recovery period needed to regain the initial pollutant removal efficiency were investigated. Experiment results revealed that the sludge volume index (SVI) increased and the floc size and fractal dimension decreased after starvation under both aerobic and non-aerobic conditions. Sludge settleability deteriorated faster under aerobic conditions compared to non-aerobic conditions. Under non-aerobic conditions, the SBR required less time to return to its initial pollutant removal efficiency and settleability. Floc size, fractal dimension, and SVI were observed to be fairly correlated with each other. The results demonstrated that it was better to maintain the sludge under non-aerobic rather than aerobic starvation, because it adapted to, resisted starvation and had a quicker re-start afterward.

• Environmental Engineering Research
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• v.25 no.2
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• pp.212-221
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• 2020

This work discusses the palm oil mill processing carried out at Jugra Palm Oil Mill Sdn Bhd, situated at Selangor, Malaysia with the capacity of 45-t fresh fruit bunch (FFB)/h. Typically, oil palm residues and palm oil mill effluent (POME) from FFB are generated while processing. Prior to discharge, POME should be treated to remove pollutants in the effluent. As such, the performances of anaerobic and aerobic ponds were assessed in this study to determine temperature, pH, biological oxygen demand (BOD), sludge volume index (SVI), and dissolved oxygen (DO). From the experiments, mesophilic temperature due to better process stability was applied in anaerobic ponds. The pH results displayed a fluctuating trend between lower control limit and upper control limit, and, the pH value increased from one pond to another. The final discharge BOD and SVI appeared to be lower than 100 mg/L and 10 mL/L indicating low degree of pollution and good settling ability for biomass/solid. DO was close to normal, mostly below 2 mg/L. The experimental outcomes revealed the effective treatability of POME in adherence to the standard regulation, which is the priority for environmental sustainability within this industry domain.

• Journal of Environmental Science International
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• v.20 no.9
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• pp.1079-1085
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• 2011

The purpose of this study is to find the operational characteristics of nitrifier-dominated membrane bioreactor (MBR), which has been extensively studied for organic removal, especially in terms of nitrite ($NO_2$-N) build-up and membrane fouling. Membrane fouling is one of the important factor which determines the economics of MBR system. The characteristics of membrane fouling was monitored in terms of the fouling indices such as sludge volume index (SVI), the concentration of total organic carbon (TOC) and extracellular polymeric substances (EPS) in a membrane permeate or sludge extract, the absorbance of supernatant at 260 nm. Most of index values except for protein concentration in EPS had a close relation with the increase of suction pressure and SVI value. Nitrifying MBR was superior to the conventional organic-oxidizing MBR in terms of membrane fouling since the fouling index value of nitrifying MBR was lower than that of BOD-oxidizing MBR.

• Journal of Korean Society on Water Environment
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• v.25 no.6
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• pp.964-971
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• 2009

In this paper, activated sludge settling was characterized based on field trip and zone settling tests. Plants used for this study include 5 conventional activated sludge processes and 3 A2O type treatment processes. The treatment capacities are in the range from 12,000 to $250,000m^3$/day. Total number of zone settling tests were 188 set and SVI values representing settling characteristics were from 100 to 300 mL/g. It was found out that zone settling velocity of these examined plant sludges can be approximated by mean values calculated by Keinath and Daigger/Roper models. Based on these three models, solid flux analysis were carried out in order to compare design criteria ($3.96{\sim}6.04kg/m^2-hr$) recommended by Korea Sewage Facility Design Guideline with two models used in USA. The results show that design criteria are only applicable for normal condition in settling characteristics (below SVI 100 mL/g). Solid flux analysis of surveyed plants indicates that most of the plants are operated underload conditions except several plants experiencing poor sludge settling problem. Most of the plants are operated under high sludge blanket depths (SBD).

• Journal of Environmental Science International
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• v.11 no.4
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• pp.339-346
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• 2002

Physico-chemical properties of the activated sludges(Suyoung and Changlim treatment plant), such as SVI(sludge volume index), absorbance, specific surface area, and specific resistance using Buchener funnel test were investigated with changing anaerobic storage time. This experimental condition was found that it was possible to estimate a linear relationship between their parameters such as specific surface area specific resistance, and sludge volume index(SVI). The specific surface area and the specific resistance to filtration of the activated sludges of Suyoung and Changlim treatment plant were found as 123.6~136.6$m^2$/gDS and 41.5~44.9$m^2$/gDS(dry solid), and 1.09$\times$10$^{14}$ ~5.48$\times$10$_{14}$ m/kg and 1.05$\times$10$^{14}$ ~2.48$\times$10$^{14}$ m/kg, respectively. The results gave a good linear relationship between the specific surface area and the specific resistance, r=2.25$\times$10$^{12}$ s-8.10$\times$10$^{13}$ ($R^2$=0.8885) at Suyoung treatment plant and r=1.26$\times$10$^{13}$ s-4.75$\times$10$^{14}$ ($R^2$=0.8756) at Changlim treatment plant.

• Journal of Korean Society of Water and Wastewater
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• v.20 no.2
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• pp.273-280
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• 2006

The sludge settleability is a key factor for operating activated sludge process as well as BNR (biological nutrient removal) process, because the poor sludge settling causes an increase of suspended solid in the effluent. In order to improving the sludge settleability, a settling agent such as iron dust can be applied. In this study, the effect of sludge settleability on the performance of DNR (Daewoo nutrient removal) process was investigated with GPS-X, which is the popular wastewater treatment process model program, and the result of modeling was verified with operating lab-scale DNR process. As a result, if the sludge blanket keeps stable in the secondary settling tank, the effluent quality is similar in spite of different SVI values. And in case of the good sludge settleability, short HRT or long SRT increased the biomass concentration in the bioreactor, and improved the pollutant removal efficiency. In spite of daily influent changing, the good sludge settleability also guaranteed the stable effluent quality. And the results of the lab-scale DNR process experiment could support the simulated results.