The physical treatment such as chemical precipitation or adsorption was usually added after biological treatment in wastewater treatment process since it was enforced to reduce the concentration of phosphate for wastewater effluent to 0.2 mg/L as P which was well known as one of main nutrient causing eutrophication in waterbody. Therefore, the new material functioned for both adsorption and disinfection was prepared with Fe and Cu, and TiO2, respectively, by changing the ratio of concentration referred to tri-metal (TM). According to SEM-EDS, TiO2 was 30~40% composition for any TM regardless of any synthesis condition. However, the ratio of composition for Fe and Cu was dependent on the initial Fe and Cu concentration, respectively. The removal efficiency of phosphate was obtained to 15% at low initial concentration and the maximum uptake (Q) was calculated to ~11 mg/g through Langmuir isotherm model using TM1 which was synthesized at 1000 mg/L, 1000 mg/L, and 2 g (10 g/L) for Fe(NO3)3, Cu(NO3)2, TiO2, respectively. In disinfection test, the efficiency of virus removal using TM was increased with increase of dosage of TM and can be reached 98% at 0.2 g.

Disinfection of microorganisms using UV light is widely used in the field of water supply and wastewater treatment plant, In spite of high germicidal effect and relatively clean by-product, UV disinfection has fundamental defeat that is accumulation of fouling materials at the interface of water and lamp sleeve. Non-contact type of UV photoreactor which can avoid this fouling generation was developed and the experimental performance evaluation of the system was carried out in this study. Log inactivation rate of E. coli was selected as a disinfection index. The concentration of E. coli of second clarifier effluent was 8.2×101 - 8.2×103 colony per mL and was well inactivated by the non-contact type of UV photoreactor. Under the UV intensity condition of 2.1 - 2.5mW/cm2, E. coli removal rate was observed in the range of 54 - 95% when the HRT was increased from 10 to 52 seconds. Experimental results showed that log inactivation of E. coli was proportional to UV dosage and 200mJ/cm2 of UV dose is expected for the 2.0 log inactivation of E. coli from the second clarifier effluent. Between the two parameters of UV intensity and contact time which are consist of UV dose, UV intensity was 4 times more effective than contact time.s

Study on effluent organic matter (EfOM) characteristic and removal efficiency is required, because EfOM is important in regard to the stability of effluents reuse, quality issues of artificial recharge and water conservation of aqueous system. UV technology is widely used in wastewater treatment. Many reports have been conducted on microbial disinfection and micro pollutant reduction with UV treatment. However, the study on EfOM with UV has limited because low/medium pressure UV lamp is not sufficient to affect refractory organics. The high intensity of pulsed UV would mineralize EfOM itself as well as change the characteristics of EfOM. Chlorine demand and DBPs formation is affected on the changed amounts and properties of EfOM. The objective of this study is to investigate the effect on EfOM, chlorine residual, and chlorinated DBPs formation with low pressure and pulsed UV treatment. The removal of organic matter through low pressure UV treatment is insignificant effect. Pulsed UV treatment effectively removes/transforms EfOM. As a result, the chlorine consumption is changed and chlorine DBPs formation is decreased. However, excessive UV treatment caused problems of increasing chlorine consumption and generating unknown by-products.

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.

Currently, the application of TiO2 photocatalyst has been focused on purification and treatment of wastewater. However, the use of conventional TiO2 slurry photocatalyst results in disadvantage of stirring during the reaction and of separation after the reaction. And the usage of artificial UV lamp has made the cost of photocatalyst treatment system high. Consequently, we studied that solar light/TiO2 film system was designed and developed in order to examine disinfection characteristics of sewage wastewater treatment. The optimum conditions for disinfection such as solar light intensity, characteristic of sewage wastewater, amounts of TiO2 and comparison of solar ligth/TiO2 systems with UV light/TiO2 system was examined. The results are as follows: (1) photocatalytic disinfection process with solar light in the presence of TiO2 film more effectively killed total coliform (TC) than solar light or TiO2 film absorption only. (2) The survival ratio of TC and residual ratio of organic material (BOD, CODcr) decreased with remain resistant material. (3) The survival ratio of TC and residual ratio of organic material (BOD, CODcr) decreased with the increase of amounts of TiO2. (4) TC survival ratio decreased linearly with increasing UV light intensity. (5) The disinfection effect of solar light/TiO2 slurry system decreased more than UV light/TiO2 film systems. (6) The disinfection reaction followed first-order kinetics. We suggest that solar light instead of using artificial UV light was conducted to investigate the applicability of alternative energy source in the disinfection of TC and the degradation of organic material.