가축분뇨처리공정의 자동제어 인자 신뢰성 평가 및 적정 외부탄소원 공급량 지표 확립
Estimation of Reliability of Real-time Control Parameters for Animal Wastewater Treatment Process and Establishment of an Index for Supplemental Carbon Source Addition
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Responses of real-time control parameters, such as ORP, DO and pH, to the conditions of biological animal wastewater treatment process were examined to evaluate the stability of real-time control using each parameter. Also an optimum index for supplemental carbon source addition based on NOx-N level was determined under a consideration of denitrification rate by endogenous respiration of microorganism and residual organic matter in liquor. Experiment was performed with lab-scale sequencing batch reactor(SBR) and working volume of the process was 45L. The distinctive nitrogen break point(NBP) on ORP-and DO-time profiles, which mean the termination of nitrification, started disappearing with the maintenance of low NH4-N loading rate. Also the NBP on ORP-and DO-time profiles was no longer observed when high NOx-N was loaded into the reactor, and the sensitivity of ORP became dull with the increase of NOx-N level. However, the distinctive NBP was constantly occurred on pH(mV)-time profile, maintaining unique profile patterns. This stable occurrence of NBP on pH(mV)-time profile was lasted even at very high NOx-N:NH4-N ratio(over 80:1) in reactor, and the specific point could be easily detected by tracking moving slope change(MSC) of the curve. Revelation of NBP on pH(mV)-time profile and recognition of the realtime control point using MSC were stable at a condition of over 300mg/L NOx-N level in reactor. The occurrence of distinctive NBP was persistent on pH(mV)-time profile even at a level of 10,000mg/L STOC(soluble total organic carbon) and the recognition of NBP was feasible by tracing MSC, but that point on ORP and DO-time profiles began to disappear with the increase of STOC level in reactor. The denitrfication rate by endogenous respiration and residual organic matter was about 0.4mg/L.hr., and it was found that 0.83 would be accepted as an index for supplemental carbon source addition when 0.1 of safety factor was applied.
Abstract
Responses of real-time control parameters, such as ORP, DO and pH, to the conditions of biological animal wastewater treatment process were examined to evaluate the stability of real-time control using each parameter. Also an optimum index for supplemental carbon source addition based on NOx-N level was determined under a consideration of denitrification rate by endogenous respiration of microorganism and residual organic matter in liquor. Experiment was performed with lab-scale sequencing batch reactor(SBR) and working volume of the process was 45L. The distinctive nitrogen break point(NBP) on ORP-and DO-time profiles, which mean the termination of nitrification, started disappearing with the maintenance of low NH4-N loading rate. Also the NBP on ORP-and DO-time profiles was no longer observed when high NOx-N was loaded into the reactor, and the sensitivity of ORP became dull with the increase of NOx-N level. However, the distinctive NBP was constantly occurred on pH(mV)-time profile, maintaining unique profile patterns. This stable occurrence of NBP on pH(mV)-time profile was lasted even at very high NOx-N:NH4-N ratio(over 80:1) in reactor, and the specific point could be easily detected by tracking moving slope change(MSC) of the curve. Revelation of NBP on pH(mV)-time profile and recognition of the realtime control point using MSC were stable at a condition of over 300mg/L NOx-N level in reactor. The occurrence of distinctive NBP was persistent on pH(mV)-time profile even at a level of 10,000mg/L STOC(soluble total organic carbon) and the recognition of NBP was feasible by tracing MSC, but that point on ORP and DO-time profiles began to disappear with the increase of STOC level in reactor. The denitrfication rate by endogenous respiration and residual organic matter was about 0.4mg/L.hr., and it was found that 0.83 would be accepted as an index for supplemental carbon source addition when 0.1 of safety factor was applied.
참고문헌 (12)
- 김원용, "생물학적 축산폐수 처리공정의 자동제어 방법 및 제어 인자의 안정성", 한국동물자원과학회지, 46(2), pp.251~260 (2004), 한국동물자원과학회
- Akin, B. S., "Monitoring and control of biological nutrient removal in a sequencing batch reactor", Process Biochemistry, 40, pp.2873~2878 (2005)
- Chen, K. C., "Real-time control of an immobilized-cell reactor for wastewater treatment using ORP", Wat. Res., 36, pp.230~238 (2002)
- Kim, J. H., "Integrated real-time control strategy for nitrogen removal in swine wastewater treatment using sequencing bstch reactors", Wat. Res., 38, pp.3340~3348 (2004)
- Kishida, N., "Effectiveness of oxidation- reduction potential and pH as monitoring and control parameters for nitrogen removal in swine wastewater treatment by sequencing batch reactors", Bioscience and bioengineering, 96(3), pp.285~290 (2003)
- Marsili, L. S., "Control of SBR switching by fuzzy pattern recognition", Wat. Res., 40, pp.1095~1107 (2006)
- Peng, Y. Z., "Improving nitrigen removal using on-line sensors in the A", O process, 2006, pp.31, 48~55
- Ra, C. S., "Biological nutrient removal with an internal organic carbon source in piggery wastewater treatment", Wat. Res., 34(3), pp.965~973 (2000)
- Ra, C. S., "Control of a swine manure treatment process using a specific feature of oxidation reduction potential", Bioresource technology, 70, pp.117~127 (1999)
- Ra, C. S., "Real-time control of two-stage sequencing batch reactor system for the treatment of animal wastewater", Environmental Techology, 19, pp.343~356 (1998)
- Yu, R. F., "Monitoring and control using on-line ORP on the continuous flow activated sludge batch reactor system", Wat. Sci. Tech., 35(1), pp.57~66 (1997)
- Zhang, Z., "A two-step SBR for treating swine manure", Process Biochemistry, 41, pp.892~900 (2006)