간행물
상하수도학회지 KCI 등재 Journal of the Korean Society of Water and Wastewater
- 발행기관 대한상하수도학회
- 자료유형 학술지
- 간기 격월간
- ISSN 1225-7672 (Print)2287-822X (Online)
- 수록기간 1993 ~ 2024
- 주제분류 공학 > 건축공학 공학 분류의 다른 간행물
- 십진분류KDC 539DDC 628
권호리스트/논문검색
제36권 제3호 (2022년 6월) 3건
1.
2022.06
구독 인증기관 무료, 개인회원 유료
The water consumption data of individual consumers must be analyzed and forecast to establish an effective water demand management plan. A k-mean cluster model that can monitor water use characteristics based on hourly water consumption data measured using automated meter reading devices and demographic factors is developed in this study. In addition, the quantification model that can estimate the daily water consumption is developed. K-mean cluster analysis based on the four clusters shows that the average silhouette coefficient is 0.63, also the silhouette coefficients of each cluster exceed 0.60, thereby verifying the high reliability of the cluster analysis. Furthermore, the clusters are clearly classified based on water usage and water usage patterns. The correlation coefficients of four quantification models for estimating water consumption exceed 0.74, confirming that the models can accurately simulate the investigated demographic data. The statistical significance of the models is considered reasonable, hence, they are applicable to the actual field. Because the use of automated smart water meters has become increasingly popular in recent year, water consumption has been metered remotely in many areas. The proposed methodology and the results obtained in this study are expected to facilitate improvements in the usability of smart water meters in the future.
5,100원
2.
2022.06
구독 인증기관 무료, 개인회원 유료
수용액에서 EBT의 분해는 pH, Ferrate (VI) 투입량, 초기 농도, 수용액 온도 등 다양한 변수의 조건에서 연구되었다. 최대 분해 효율은 pH 7.0에서 95.42%가 달성되었으며, 이 실험 조건에서 얻은 kapp 값은 872.87 M-1s-1 이었다. EBT 분해율은 Ferrate (VI)의 투입량이 증가함에 따라 증가하였으며 EBT 초기 농도가 감소함에 따라 EBT 분해의 초기 속도 상수가 증가하였다. 또한 EBT의 분해율은 온도가 10°C에서 45°C에 도달할 때까지 수용액의 온도에 따라 증가하였으며 이 실험조건에서 활성화 에너지 값은 EBT 분해에 대해 11.9 kJ/mol의 값이 도출되었다. 따라서 분해 실험의 결과는 Ferrate (VI)가 수용액상에서 EBT를 효과적으로 분해시킬 수 있음을 보여주고 있다.
4,000원
3.
2022.06
구독 인증기관 무료, 개인회원 유료
In this study, newly improved Ferron assay test haved on timed spectrometry was used for the determination of hyolrolytic Al species presented in PACl coagulant. The color development reagent ferron was prepared by using conventional method and two newly developed methods. Then the ferron assay test was used to compare and analyze the distribution of Al(III) hydrolyzed species presented in the prepared PACl and alum. The preparing method of reagent A required an aging period of 7 days by adding a hydroxylamine hydroxide and a 1,10-phenanthroline monohydrate reagent, whereas the preparing method of reagent B was used as a coloring agent immediately without aging time. The regression analysis between UV absorbance and Al concentrations of conventional method and newly developed method of ferron reagents in low-concentration aluminum solutions and high-concentration aluminum solutions, showed the correlation coefficients of 0.999 or higher, as showing high correlations of conventional method and newly developed method. Applying Ferron assay test, Al species in the PACls and alum were classified as Ala(monomeric Al), Alb (polymeric Al), and Alc (colloidal and precipitated Al). Distribution of Al(III) hydrolyzed species according to the preparation of ferron colorimetric reagents was similar.
4,000원
