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DOI : ,    Vol.28, No.4, 61 ~ 69, 2020
Title
Evaluation of Recovery Efficiency of Single and Multi-Stage Hydrocyclone for Reuse Improvement Additives
서희승 Heeseung Seo , 김연권 Younkwon Kim
Abstract
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.
Key Words
Hydrocyclone, MLSS Concentration, Settleability improvement additives, Separation rate, 하이드로사이클론, 미생물 농도, 가중응집제, 입자의 분리속도
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