학술논문
응집제 주입량 변화가 섬유볼 여과장치 처리특성에 미치는 영향
Effects of Variation in the Amount of Coagulant Injection on the Treatment Characteristics of Fiber ball Media Filter
Effects of Variation in the Amount of Coagulant Injection on the Treatment Characteristics of Fiber ball Media Filter
Document Type
Article
Source
한국도시환경학회지, 23(4), 68, pp.163-172 Dec, 2023
Subject
Language
한국어
ISSN
1598-253X
Abstract
강우유출수와 같은 비점오염원은 대부분 100 m 이하의 미세입자로 이루어져 있어 오염물질들이 흡착 및 부착되어 거동하기 쉬운 특성을 가지고 있다. 이러한 미세입자를 고효율로 처리하기 위해 응집제를 이용한 여과방식에 대한 연구도 진행되고 있으나 응집제를 이용한 방식은 응집제 주입량에 따라 그 효율이 달라져 처리 조건에 따른 최적의 응집제 주입이 필수적이다. 때문에 본 논문에서는 섬유볼 여재를 적용한 상향류식 여과 컬럼 장치에 응집제를 주입하여 미세입자 처리효율을 향상시키고 장치 내 응집제 주입량을 달리하여 최적의 응집제 주입량 산정 및 주입량 변화에 따른 여과장치 처리특성을 분석하고자 하였다. 실험 결과 유입수에 대한 응집제 주입 농도가 15.625 mg/L 일 때, 탁도 평균 98.88%, SS 평균 98.76%로 가장 높은 미세입자 처리효율로 나타났으며 그 이상부터는 처리효율이 미세하게 감소하는 것으로 나타났다. 또한 고형물 물질수지계산을 통해 역세척 효율을 산정한 결과, 응집제 주입량이 증가할수록 역세척 효율이 감소하여 응집제의 주입이 역세척에 직접적인 영향을 끼치는 것으로 나타났다. 따라서 상향류식 섬유볼 여과장치에 응집제를 주입하여 고효율 처리를 진행할 경우, 응집제 주입농도를 15.625 mg/L로 할 때가 가장 고효율적이며 적절한 응집 여과 조건인 것으로 사료된다.
Non-point source pollution such as rainfall runoff water are mostly composed of fine particles of 100 μm or less, so pollutants are easily adsorbed and attached to move. Studies on a filtration method using a coagulant are also being conducted to treat these fine particles with high efficiency, but the method using a coagulant has its efficiency depending on the amount of coagulant injected, so it is essential to inject an optimal coagulant according to the treatment conditions. Therefore, in this paper, a coagulant was injected into the upflow filtration column device to which the fiber ball filter was applied to improve the processing efficiency of fine particles, and the injection amount of the coagulant in the device was different to calculate the optimal amount of the coagulant injection and analyze the processing characteristics of the filtration device according to the change in the injection amount. As a result of the experiment, when the concentration of the coagulant injection to the influent water was 15.625 mg/L, the highest fine particle treatment efficiency was found with a turbidity average of 98.88% and an SS average of 98.76%, and above that, the treatment efficiency slightly decreased. In addition, as a result of calculating the backwashing efficiency through the calculation of the solid mass balance, the backwashing efficiency decreased as the amount of the coagulant injection increased, indicating that the injection of the coagulant had a direct effect on the backwashing. Therefore, when the high efficiency treatment is performed by injecting a coagulant into the upflow fiber ball filtration device, it is considered to be the most efficient and appropriate agglomerate filtration condition when the concentration of the coagulant injection is 15.625 mg/L.
Non-point source pollution such as rainfall runoff water are mostly composed of fine particles of 100 μm or less, so pollutants are easily adsorbed and attached to move. Studies on a filtration method using a coagulant are also being conducted to treat these fine particles with high efficiency, but the method using a coagulant has its efficiency depending on the amount of coagulant injected, so it is essential to inject an optimal coagulant according to the treatment conditions. Therefore, in this paper, a coagulant was injected into the upflow filtration column device to which the fiber ball filter was applied to improve the processing efficiency of fine particles, and the injection amount of the coagulant in the device was different to calculate the optimal amount of the coagulant injection and analyze the processing characteristics of the filtration device according to the change in the injection amount. As a result of the experiment, when the concentration of the coagulant injection to the influent water was 15.625 mg/L, the highest fine particle treatment efficiency was found with a turbidity average of 98.88% and an SS average of 98.76%, and above that, the treatment efficiency slightly decreased. In addition, as a result of calculating the backwashing efficiency through the calculation of the solid mass balance, the backwashing efficiency decreased as the amount of the coagulant injection increased, indicating that the injection of the coagulant had a direct effect on the backwashing. Therefore, when the high efficiency treatment is performed by injecting a coagulant into the upflow fiber ball filtration device, it is considered to be the most efficient and appropriate agglomerate filtration condition when the concentration of the coagulant injection is 15.625 mg/L.