We used a conventional activated sludge process to treat a paper wastewater, and then the effluent was treated with an ozone oxidation process as advanced process to remove non-degradable materials. It was found that the removal efficiency rates of the organic matter has been rapidly increased initially, and then it was almost constant after this period. The concentration of ozone should be recommended to maintain approximately 8.3 mg/L during this operation to keep the CODmn value below 100 mg/L and ozone contact time longer than 60 min.

In this study, disinfection effect of coliform group treated with ozone was analyzed for the effluent discharging from activated sludge treatment process in hospital wastewater treatment plant. Based on these results, it aims to get basic data to establish the disinfection facility in hospital wastewater treatment, suggesting affecting factors according to hydraulic retention time of the activated sludge process and design basic factors necessary to ozone disinfection. Removal efficiencies of coliform group for the effluent according to HRT such as 4hr, 8hr, 12hr were analyzed using a lab-scale activated sludge process, respectively. To decay the microorganism regulates the CT value multiplied disinfectant concentration by contact time. CT value is highly correlated with a removal efficiency of coliform group and according to increasing an injected ozone concentration, the CT value was increased.. When HRT was 4, 8, 12 hours , CT value takes place at minimum condition 50, 40, 334 mg/L-min, respectively.

This study of hospital wastewater by activated sludge wastewater treatment facility for your use of the UV disinfection process in the HRT and the UV intensity UV disinfection coliform group by evaluating the effectiveness of the disinfection facilities to meet basic data is for. Study the active sludge process coliform group emissions alone will not meet the accepted standards of the disinfection process needs to be separate. Active sludge from the same UV dose settling water interfere with my a particle substance acts as an argument between the disinfection effect a point of difference, which requires the removal of material a particle before in disinfect. The higher the UV intensity coliform group HRT long the effects of the disinfection was higher, permitted emission standards 3,000 EA/mL to meet UV dose said the 82 mJ/cm2. Existing water pollution prevention facilities, the design of the UV dose 2,310 mJ 1m/cm2 the a safety factor 50% of the company considered the same as after consideration, 120 mJ/cm2 to about 19 times higher than the results of the experiment setup, and of the existing water pollution prevention facilities UV disinfection equipment is installed, the excess.

This study is to evaluate control effects of separation wall by surveying water quality and sewer overflows during dry and wet periods in combined sewer and separated sewer systems. Ravine water from the combined Seokgyo outfall with the separation wall was separated about four times larger than sewage flow during dry periods. The water quality of the combined Seokgyo outfall with separation wall during dry periods is flow weighed average T-N 22mg/L, T-P 2.4mg/L, the combined Chenseokgyo outfall without the separation wall is average T-N 21mg/L, T-P 2.6mg/L, and the separated Pyoungsong center outfall is average T-N 12mg/L, T-P 1.0mg/L. The T-N, T-P concentration in separated outfall make form about 44%, 42% of the combined outfall, and this means the separated outfall (i.e. storm sewer) is polluted by inflow of sewage. The overflow load of the separated outfall is ten times higher than the combined outfall and its overflow load per rainfall is three times than combined outfall during the wet periods. Therefore, the control plan of overflow load is required in storm sewer. The control effects of the overflow load increased 100% by setting the separation wall in the combined sewer, and showed 44% increase without the separation wall in separated sewer, but forecasted over than 82% increase of effects with the separation wall.

The average BOD concentration was found to be about 269mg/L before a process innovation, but after the innovation, it became 30mg/L, which satisfied the effluent standard of 120mg/L. The removal effluent standard of 120mg/L. The removal efficiency was about 60～80%, and the concentration of the treated water was found th be low. after the process innovation, the average COD concentration was 29mg/L, and the CODmn removal efficiency became low to the level of about 65～76%, which was found lower than the effluent standard of 130mg/L. After the process innovation the SS average concentration of the treated water was 13mg/L, which was lower than that before the innovation (32mg/L). By the activated sludge process innovation, the SS removal efficiency was improved to be 30～70%. The average concentration of total coliform before the process innovation was 6100 count/mL because an Activated sludge process only occasionally pass over the allowed standard(The average number of the total coliform of Activated sludge process treated water was about 8100 count/mL), UV disinfection process was introduced. after the introduction, the average number of the total coliform was 1800 count/mL, which satisfied the allowed effluent standard of 3000 count/mL.

This study presented the plan for treatment plant as investigating the technical examination of existing landfill leachate treatment plant at Geumgo-Dong and the plan of landfill leachate treatment with sewage treatment. The R/O process in 1st stage landfill leachate treatment plant(plant capacity:150m3/d) was closed in consideration of economical aspect and efficiency. It is to be desired that the 1st stage and 2nd stage landfill leachate treatment (plant capacity: 250m3/d) are combined, and are converted the Pretreatment process with nitrogen treatment process, and after total landfill treatment leachate happened from landfill site is pretreated it is transferred the sewage treatment plant. Ammonia nitrogen load of landfill leachate that was transferredthe sewage treatment plant(plant capacity: 300,000m3/d). This load is no problem at now, but it is need change the inflow line for sewage treatment plant and the enlargement of pretreatment process in case that the raw landfill leachate is increased.

This survey was accomplished to compare the characteristics of water quality and algae at the Daechung Dam with those at its regulating reservoir from the year 2003 to 2005. In the case of Daechung Dam, three sites, such as the area near dam body, the Mooneui intake station, and Chudong intake station, were selected averaged data were used for the comparison. The water quality of the Daechung Dam are an follows; temperature is from 4 to 25℃(average 15), pH is from 7.3 to 8.6(average 7.9), DO is from 5.7 to 13.0mg/L(average 9.9), BOD is from 0.7 to 1.7mg/L(average 1.1), COD is from 2.5 to 4.4mg/L (average 3.1), SS is from 1.1 to 9.8mg/L(average 3.2), total coliform is from 0 to 37MPN/100mL(average 11), total phosphorus is from 0.008 to 0.074mg/L(average 0.022) and total nitrogen is from 1.087 to 2.175mg/L(average 1.492). The water quality of regulating reservoir are an follows; temperature is from 1.0 to 24.0℃(average 13), pH is from 6.7 to 8.2(average 7.6), DO is from 5.9 to 13.2mg/L(average 9.2), BOD is from 0.3 to 1.8mg/L(average 0.8), COD is from 2.4 to 5.3mg/L(average 3.8), SS is from 1.2 to 50mg/L(average 9.0), total coliform is from 0 to 260MPN/100mL(average 56), total phosphorus is from 0.005 to 0.224mg/L(average 0.04) and total nitrogen is from 1.123 to 5.227mg/L (average 2.3). The water quality of regulating reservoir had been the Class Ⅱ raw water criteria ein years ago, but it has been improved to Class I recently. Whereas the water quality of the Daechung Dam has been maintained as Ⅱ except COD.

The aim of this study is to allocate the amount of discharging pollution loads according to the main pollutants such as population, livestock, soil, industrial facilities of Yugu basin which is a branch of Geumriver. Also, the object area was divided into 22 small subbasin sectors to assess the loading amount and applicate the water quality model. The considering items to forecast the water quality were restricted BOD, TN and TP which had affluent data relatively. And only BOD data was used to calculate unit loading amount of the basin and arrangement of optimum pollution load. As a calculating result for the amount of discharged pollution load based on the pollution sources and data, the loading amount and density of the basin became the highest after joining of Yugu and Magok. And the results of the expected loading amount indicated the increase rate of load occurrence was less than average ±1.5% per year for BOD, TN and TP. So, it was known that factors such as population, livestock and industrial transformation kept up as present. The flow running rate for the small drainage sector by the running load amount was highly analyzed TP, BOD and TN in order. And the running load amount was high in case small basin and short running length. Also, BOD contribution rate was large as near the length for the end point of the stream and high pollution influx. The running load amount was 629.85kg/d and permission load amount was 483.03kg/d at the end of Yugu basin. Therefore, it is considered that the amount is to reduce 146.82kg/d and reduction load amount by the region on establishing the sewage treatment facilities was expected 185.07kg/d for Yugu, 22.21kg/d Shinpoong, 25.91kg/d Sagok, 20.26kg/d Woosung and 255.40kg/d after total same time reduction. So, it is concluded that the arrangement of optimum load amount for reduction is proper to Yugu, Sagok, Shinpoong and Woosung orderly.

This study examined management problems about the current rural sewage treatment facilities where is outside of sewage treatment boundary in Chungnam province. It suggested that optimum plan based on this investigation as follows. Management cost of sewage treatment facilities considering the circuit operation person was charge of about 51.8% personnel expenditure, 31.0% electricity power cost, and 9.9% repairing expenses. So, the presumptive cost will be to ￦191/㎥․d for the facility capacity a year. Recently the core operation and management has converted to environment related section or consignment company but a work subjective section administers the facilities that is a 75 districts of total 161 business zone yet. It is desirable to conclude a commission contract with the company which is operate the facilities including circuit operation person for sewage treatment plants. And it recommend that one who has qualified or certificate requirement for the sewage treatment should be stationed at the related section because there are no experienced men in many treatment facilities. Rural sewage treatment facilities and small sewage treatment plant whose capacity is more than 500㎥/d ought to be controlled by collecting sewage tax involved the related special budget according to local government regulations and the charge would be to notify the actual usage. Also, it is necessary to introduce unmanned automatic operating system in order to reduce labor costs, advance progressive management, and operate integrated management of facilities.

2005년 11월 13일 중국 동북3성에 있는 지린(吉林) 석유화학공장에서 일어난 폭발사고로 상수원인 송화강(松花, Songhua River)에 벤젠이 유출되어 인구 1000만명의 하얼빈시(哈爾濱)가 대 혼란에 빠진 사건의 실태와 이에 따른 교훈을 알고져 자료를 정리하였다.