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생물막 유동층 반응기에서 고농도 합성 폐수의 처리효율과 미생물 성상

Biomass Characteristics and Substrate Removal Efficiency Using High Concentrated Synthetic Wastewater in FBBR

김동석 안갑환 서명교 박태주 송승구

Kim DS An KH Suh MG Park TJ Song SK

HWAHAK KONGHAK, August 1991, 29(4), 448-456(9), NONE

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Abstract

이 실험의 목적은 생물막 유동층 반응기내에서 미생물 성상의 변화를 관찰하여 유기물 처리효율과 최대 미생물 농도를 아정적으로 유지할 수 있는 조건을 고찰하는 데 있다. 모래를 여재로 사용하여 수리학적 체류시간을 5시간, 상향유속을 17m/hr, 운전온도는 22±1℃, pH는 7±0.1로 고정한 상태에서 유기물 부하율을 10kg COD/m³ㆍday에서 80kg COD/m³ㆍday로 증가시키면서 실험을 수행하였다. 또한 실험에 사용한 폐수는 글루코오즈를 기질로 한 합성폐수를 조제하여 사용하였다. 유기물 부하율이 10kg COD/m³ㆍday에서 COD는 96%의 제거율을 나타내었고, 반응기내 미생물 농도는 6,530mg/l이었다. 또한, 유기물 부하율이 80kg COD/m³ㆍday로 증가되어도 COD는 73%의 높은 제거율과 반응기내 미생물 농도는 37,000mg/l를 나타내었다. 유기물 제거율의 관점에서 보면 F/M비가 1.7이하, 미생물막 두께가 420㎛ 이하에서 운전하는 것이 가장 효율적인 것으로 나타났다.

The purposes of this experiment were to investigate biomass characteristics and substrate re-moval efficiency and to find the optimum conditions on holding up higher biomass concentration in Fluidized-Bed Biofilm Reactor(FBBR). A number of experiments were conducted under the following conditions by increasing organic loading rate from 10kg COD/m³ㆍday to 80kg COD/m³ㆍday. Superficial upflow velocity was 17m/hr, operating temperature was 22±1℃ and pH was 7±0.1. The synthetic wastewater based on glucose was used as a substrate in this experiment. The removal of chemical oxygen demand(COD) with volumetric loading rates of 10kg COD/m³ㆍday was investigated to show the efficiency of aerobic FBBR. The corresponding COD removal efficiencies were 96 and 73% with volumetric loading rate of 10 to 80kg COD/m³ㆍday, respectively, and the concentrations of biomass remaining inside the reactor were shown 6,500mg/l and 37,000mg/l, respectively. These experimental conditions of the F/M ratio of 1.7 and the biofilm thickness of 420㎛ was proved to be a most appropriate condition in operating FBBR in the view of substrate removal.

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