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음식물쓰레기와 하수슬러지의 혼합비율에 따른마이크로파 건조특성 비교
정병길,송영주,노기현 대한건설환경학회 2006 건설환경연구 Vol.5 No.3
In this research food waste and sewage sludge were dried using microwave oven. The drying characteristics and reasonable mixing ratio of food waste and sewage sludge for the effect of physical factor such as moisture contents, drying rate and calorific value. The drying characteristic of microwave oven were evaluated and compared. Sewage sludge was collected in S wastewater treatment plant and food waste was collected in D university restaurant. Microwave oven with 2,450MHz frequency and 700W power is household appliances. When moisture contents of food waste and sludge cake reached 40%, drying time was 4 minute at microwave intensity of 700W. When food waste and dewatered sludge were dried using microwave oven, moisture contents of food waste and dewatered cake were 21.9% and 21.4%, respectively. And these results were higher than mixed sample. It showed that dried mixed sample improved the drying characteristics. The calorific value of food waste and dewatered sludge was 5,788.9cal/g and 3,021.3cal/g at microwave intensity of 700W. The calorific value of mixed materials was higher than dewatered sludge. From this facts, it confirmed that mixed material of food waste and sewage sludge will improve the efficiency of incineration and decrease the auxiliary fuel.
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정병길 한국고무학회 1974 엘라스토머 및 콤포지트 Vol.9 No.1
The characteristics of IR and IR blended elastomers, for footwear by means of blending with NR and SBR, have been studied. The results obtained were as follows: 1. The mastication of IR was almost not required, where as NR and SBR are necessary. Therefore mixing time was much reduced because of speedy filler feeding. 2. Disadvantage of low Mooney viscosity was covered by blending with NR and SBR, and by loading filler. Superior flow property in comparison to other polymers was worthy and valuable in providing formulas for mould flow. 3. The elongation property of green stocks and vulcanizates was shown smooth surface for extruded and calendered stocks, and facilitated fabrication processes. 4. Because of slow vulcanization, IR is required to control vulcanization time by adding proper accelerators. This property, in turn, made possible to improve the storing stability of green stocks by controlling scorch time.
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위탁폐수 처리를 위한 파일럿 규모의 UF-NF 막여과 공정의 현장적용성 평가
정병길,장성호 한국환경기술학회 2020 한국환경기술학회지 Vol.21 No.1
The purpose of this study was to evaluate the field applicability of UF-NF(Ultrafiltration-Nanofiltration) membrane process as an alternative technology of evaporator in the industrial wastewater treatment system of consigned wastewater management companies. Raw water was used the wastewater before entering the evaporator. The pilot-scale UF-NF process for consigned wastewater treatment was produced with a treatment capacity of 100 m3/d and three UF and five NF membranes were installed, respectively. As a result of water quality analysis before and after UF-NF membrane treatment, the average concentrations of raw water was TDS 31,200 mg/L, Cl- 16,500 mg/L, BOD5 7,080 mg/L, CODCr 26,200 mg/L, TOC 6,650 mg/L, T-N 1,852 mg/L, T-P 6.93 mg/L, SS 35 mg/L, respectively. For UF treated water, the average concentrations were TDS 30,900 mg/L, Cl- 15,800 mg/L, BOD5 6,900 mg/L, CODCr 23,900 mg/L, TOC 6,640 mg/L, T-N 1,530 mg/L, T-P 6.81 mg/L and SS undetected, respectively. For NF(70) treated water, the average concentrations are TDS 25,700 mg/L, Cl- 14,100 mg/L, BOD5 6,810 mg/L, CODCr 22,800 mg/L, TOC 5,850 mg/L, T-N 1,370 mg/L, T-P 5.34 mg/L and SS undetected, respectively. Also for NF(90) treated water, the average concentrations are TDS 21,360 mg/L, Cl- 12,600 mg/L, BOD5 6,020 mg/L, CODCr 21,000 mg/L, TOC 4,840 mg/L, T-N 1,360 mg/L, T-P 5.19 mg/L, SS undetected, respectively. Therefore, it is difficult to satisfy the effluent quality standards in the treatment of consigned wastewater using the UF-NF process. When a filtration process was installed for meeting or better the standard water quality, RO membrane must be installed and run.
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응집제 자동주입장치를 이용한 소화슬러지 및 농축슬러지의 탈수특성 비교
정병길,윤태경,김진영,한영립,최영익,성낙창,강동효,허승녕 한국폐기물자원순환학회 2014 한국폐기물자원순환학회 학술대회 Vol.2014 No.11
본 연구는 하수슬러지의 플록상태를 파악할 수 있는 응집제 자동투입장치를 탈수기 전단에 장착하여 하수슬러지(소화슬러지, 농축슬러지) 플록상태에 따른 고분자 응집제 주입량을 다르게 함으로써 탈수케이크의 함수율 저감 및 응집제 사용량 절감, 탈수여액의 수질개선 등을 평가하는데 그 목적이 있다. 응집제 자동투입장치를 B시 N하수처리장 소화슬러지 및 S하수처리장 농축슬러지에 적용한 결과 고속회전 및 응집제 분사를 통한 균일한 플록이 형성됨에 따라 탈수케이크 함수율 및 응집제 주입율 저감효과를 나타내었다. 하수슬러지의 탈수실험 결과 소화슬러지에 대한 고분자 응집제의 적정주입율은 12%로 나타났으며, 이때의 비저항계수(SRF)는 1.11×1011 m/kg으로 나타났다. 또한, 농축슬러지에 대한 고분자 응집제의 적정주입율은 16%로 나타났으며, 이때의 비저항계수(SRF)는 1.68×1011 m/kg으로 나타났다. 또한 응집제 자동투입장치의 회전속도와 유입 하수슬러지량 대비 고분자 응집제 주입율과의 상관관계를 평가한 결과 회전속도를 900~1,200 rpm의 범위 내에서 운전시 플록형성이 양호하게 나타났다. 기존 시스템 대비 응집제 자동투입장치의 경제성 평가 결과 N하수처리장 및 S하수처리장의 경우 각각 연간 263,542,490원 및 42,174,700원으로 산출되었으며, 시설투자비 회수기간은 각각 2.3년 및 7.1년으로 나타났다. 따라서, 하수처리장 탈수기 전단에 응집제 자동투입장치를 적용함으로써 함수율 및 약품주입량 저감 뿐만 아니라 중앙제어실을 통한 실시간 모니터링이 가능하므로 인력감축 유도 및 공정자동화에도 기여할 수 있을 것으로 판단된다.
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