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서희승 ( Seo Heeseung ),김연권 ( Kim Younkwon ) 한국물환경학회 2020 한국물환경학회·대한상하수도학회 공동 춘계학술발표회 Vol.2020 No.-
인구 밀집과 성수기의 급작스런 유량증가 등으로 인해 하수처리량이 증가하게 되면서 하수도 사업방향은 소규모 재래식에서 대규모 현대식으로 전환되고 있다. 일부 처리장에서는 하수처리용량 증대 및 공정개량을 통해 이를 대응하고 있지만 개량에 필요한 건설비 및 운영비 등으로 인해 각 하수처리장에서 부담이 증대되고 있다. 따라서 본 연구에서는 침전-가속화제 기술(Sedimentation Accelerating Technology)을 선정하여 연구를 진행하였다. SAT기술은 비중이 무거운 소재를 활용하여 소재자체의 자중으로 침전조 내의 슬러지를 물리적으로 가라앉혀 침전능을 향상시키는 기술이며, 별다른 공정을 추가하거나 개량하지 않아도 하수처리장의 처리효율을 증대시킬 수 있다. 이를 통해 공정개량 및 고도화기술이 필요한 기존 재래식 하수처리장의 공정개량 및 운영비를 절감할 수 있으며, 30~40%의 처리용량 증대효과를 기대할 수 있다. 본 연구에서는 가중응집제로서 하수슬러지 활성탄을 선정하였으며, 기존에 연구된 가중응집제인 microsand, magnetite 등과 물성분석 및 슬러지 침강테스트를 통해 침강성 개선재로의 활용가능성을 관찰하였다. 또한 이러한 가중응집소재를 일회성으로 사용하는데 그치지 않고, 하이드로사이클론 장치를 이용하여 하수슬러지와 가중응집제를 고액 분리하여 재활용할 수 있는 방안에 대해 고려하였다.
가중응집제 재이용을 위한 단일 및 다단 하이드로사이클론의 회수효율 평가
서희승 ( Heeseung Seo ),김연권 ( Younkwon Kim ) 한국수처리학회 2020 한국수처리학회지 Vol.28 No.4
Settleability improvement additives (SIAs) have been suggested as an alternative to the chemical dose technology as a technique to increase microbial settleability. In this study, the following experiments were conducted to evaluate the recovery efficiency of SIAs using hydrocyclone. The experiment consisted of two steps. The first step is the flow rate change, and the second is the recovery rate experiment of SIAs using SIAs multistage hydrocyclone. Each experiment was performed based on the optimum recovery rate conditions, and the results were as follows. Results of hydrocyclon inflow experiment, solid-liquid seperation is performed at 8 to 16.7 L/min and activated carbon was the highest recovery rate at 16.7 L/min at 98.74 in lower of the device. The result of the recovery rate evaluation according to the change in the lower flow rate, it was about 70% at 1.08 to 1.2 L/min. SIAs was divided into M1(125 ~ 250 μm) and M2(250 ~ 425 μm) according to the particle size and sedimentation of the sludge was more effective when M1 is low MLSS and M2 was high. In addition, M1 had a lower recovery rate of about 40 to 50 percent compared to M2, which is considered difficult for solid-liquid seperation due to its particle size. The recovery rate of activated carbon was found to be different for each sewage treatment plant, which is considerd to be due to different shape and properties of the sludge floc in each plant. The sewage treatment plant adopted the general activated sludge process showed a recovery rate of 99% or more through multiple stage at MLSS 4300 mg/L. However, other sewage treatment plants in the same MLSS showed recovery rates of 85 to 90%, which is considered to be affected by microbial species and EPS.
김연권 ( Younkwon Kim ),서희승 ( Heeseung Seo ),최종웅 ( Jongwoong Choi ) 한국수처리학회 2020 한국수처리학회지 Vol.28 No.5
This study was performed to find out the characteristics of microorganisms affect the volume reduction ratio(VRR) of sludge. This study can be divided into two main categories. The first experiment compared the values of VRR and microbial species characteristics of microorganisms in a sewage treatment plants(STPs) under three different operating conditions. The second experiment evaluated the effect of extracellular polymeric substances(EPS) on VRR efficiency. The microorganisms that were collected from three types of STPs were first classified into samples according to their concentration. Subsequently, the VRR values were compared by adding two types of activated carbon powder(M I 125~250 ㎛, M II 250~425 ㎛) as a weighted additives. As a result, it was found that a large VRR was achieved for a range of mixed liquor suspended solids(MLSS) 3,500~6,400 mg/L, regardless of the characteristics of the microorganism, due to the weighted additives. In contrast, it was shown that the VRR of microorganisms with a long sludge retention time(SRT) rapidly decreased for concentrations exceeding MLSS 5,500 mg/L. As an important operating parameter for STPs, it has been considered that SRT determines the EPS concentration of microorganisms within the process. As a result of analyzing the EPS of two types of microbial samples with different SRT, it was shown that the concentration of EPS was low in the case of the sample with long SRT, and the concentration of EPS was high in the case of the sample with short SRT. All the results revealed that to improve microbial settleability using weighted coagulation technology, it is desirable to use it in the range of MLSS 3,500 to 5,500 mg/L, or apply it to STP with short SRT under the higher concentrations of MLSS 5,500 mg/L.