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임연택,윤조희,서정범,유순주,류덕희,홍정선,서윤수 ( Y . T . Rim,C . H . Yoon,J . B . Seo,S . J . Yu,D . H . Rhew,J . S . Hong,Y . S . Suh ) 한국물환경학회 1992 한국물환경학회지 Vol.8 No.3
For a practical application of technologies for treating the polluted stream water, the Changneung Stream water at Koyang-Kun, Kyungki province was treated by using the Gravel Contact Oxidation Processes with the aerated and the non-aerated types as on-site facilities for one year. The results are as follows: 1. In the BOD concentration of the influent into facilities, annual average was 36.3㎎/ℓ. And monthly averages were the lowest as 6.6㎎/ℓ in Aug. and the highest as 40.2㎎/ℓ in Aug. In case of TKN, monthly concentrations were 3.2 ㎎/ℓ in Aug. and 13.3㎎/ℓ in Jun., which was caused by the difference of outflowing amount from paddy fields. 2. Annual BOD concentrations of effluents from the aerated and the non-aerated types were 15.6㎎/ℓ and 25.6㎎/ℓ, respectively and treatment efficiency was increased by the aeration. In the non-aerated type, average influent BOD concentration from Nov. to Feb. higher than 30㎎/ℓ was 61.1㎎/ℓ and effluent was 46.3㎎/ℓ but average influent BOD from Mar. to Oct. lower than 30㎎/ℓ was 18.5㎎/ℓ and effluent was 10.7㎎/ℓ. So it was essential to be aerated in the facility by judging from these efficiencies when the stream water over 30㎎BOD/ℓ was treated. 3. Annual influent suspended solid(SS) was 24.1㎎/ℓ and effluents were 6.4㎎/ℓ in the aerated type and 9.2㎎/ℓ in the non-aerated. It was essential to establish the facility for eliminating sludge which was generated in the gravel layer and inflowed from the stream, to upkeep the treatment efficiency of this facility. 4. In the case of TKN and T P, influent was 8.48㎎/ℓ and 1.10㎎/ℓ and effluent from the aerated and the non-aerated was 6.85㎎/ℓ, 0.86㎎/ℓ and 8.79㎎/ℓ, 0.99㎎/ℓ, respectively.
서정범,윤조희,임연택,홍정선,류재근,서윤수 ( J . B . Seo,C . H . Yoon,Y . T . Rim,J . S . Hong,J . K . Ryu,Y . S . Suh ) 한국물환경학회 1994 한국물환경학회지 Vol.10 No.2
Membrane technology has been emerging as one of essential processes for wastewater treatment. Ultrafiltration(UF) can seperate the biomass from Activated sludge(AS) process and maintain higher biomass concentration in the process. This combination of AS and UF can have many advantages such as better effluent quality and system stability over the conventional process. In this experiment, UF combined to AS was used to investigate the effects of various operational factors on the performance of the system and the change of microorganism groups. Following conclusions were obtained. 1) Good effluent quality was obtained at high organic loading rate and good stability was maintained throughout the experiment. 2) The flux was stable with the high value when organic loading rate was maintained below 0.8㎏BOD/㎥·d at 1m/sec surface velocity. 3) The flux was decreased with increasing organic loading rate due to the sludge adherance and clogging of substrate to membrane core. 4) Microorganism groups in the aeration basin was affected due to high velocity of fluidization. Protozoa numbers were rapidly decreased with increasing surface velocity.