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하상호과 및 人工地下水富化방식에 대한 考察 (Ⅰ) : 洛東江 下流部를 中心으로 On the lower course of Nak Dong River
吳英敏,金武植,李澄姸,鄭淳亨 동아대학교 환경문제연구소 1981 硏究報告 Vol.5 No.1
Some developing countries have utilized the River bed sand to purify water work resource having obtained much effect. But there are few study for the River bed filtration and the artifical ground water enrichment method in order to improve water quality in this country. This study is purposed to get some basic data for the actual condition and the anticipative filtering efficiency of the natural river bed sand of the lower Nak Dong River basin. Surfaced in this paper are the observations that 1. The filtering efficiency of COD, BOD, S.S and T.S. were not directly in creased with the filter depth over 150㎝ of its height. 2. The removal rate of COD, BOD, S.S and T.S. mark by turns 93%, 77%, 98% and 60%, respectively when the river bed sand of the lower course of the Nak Dong River is used as the filter media. 3. The more initial concentration of COD and BOD increase, the more filtering efficiency increases on the whole.
CWOS와 황토를 이용한 농축·소화슬러지의 탈수성에 관한 연구
정병길,고현웅,주윤경,정유진,이징연 동아대학교 환경문제연구소 2002 硏究報告 Vol.25 No.1
Every year, 190,000 tons of oystershell are wasted from many oyster farms. And the fact that the main components of oystershell are CaO and Al₂O₃ which are chemically similar to those of lime leaded to an assumption that oystershell can be used as raw materials for synthesizing dewatering conditioner. In this study, the Jar-Test and the Bu˝chner funnel test were proceeded for the assessment of dewaterability of a thickened sludge and digested sludge. And TTF(Time To Filter), SRF(Specific Resistence Filtration) and TS(Total Solids) were adopted as the valuation indices of sludge dewaterability. Dewatering conditioner which composed of both oystershell and loess is much dewaterable than the one composed of only oystershell. And in the course of combining of oystershell and loess, the following fact was found that the dewaterability of the combination which have the higher ratio of oystershelI than that of loess is superior. Eventually, the most suitable ratio of dewatering conditioner complex is 9 : 1 (oystershell : loess) in treating not only thickened sludge but also digested sludge. In conclusion, the conditioner synthesized from waste oystershell and loess seems to be used as a splendid alternative material for the dewatering conditioner treating the sludge of sewage.