利用高频低强度超声波增强活性污泥特性。

Using high frequency and low-intensity ultrasound to enhance activated sludge characteristics.

机构信息

Research Center for Environmental Determinants of Health, Department of Environmental Health Engineering, School of Public Health, Kermanshah University of Medical Sciences, Kermanshah, Iran.

Environmental Research Center (ERC), Department of Applied Chemistry, Faculty of Chemistry, Razi University, Kermanshah, Iran.

出版信息

Ultrason Sonochem. 2019 Jun;54:274-280. doi: 10.1016/j.ultsonch.2019.01.030. Epub 2019 Jan 22.

DOI:10.1016/j.ultsonch.2019.01.030

PMID:30712854

Abstract

In this study, high-frequency ultrasound wave (1.8 MHz) at low intensity was applied to improve activated sludge settleability at high MLSS concentration. The effect of irradiation intensity, sonication mode, MLSS concentration and sample volume on the physical characteristics of sludge in a pilot scale settling column were investigated for optimizing the conditions. The obtained results showed that high-frequency ultrasound decreased the height of sludge (44%) and effluent turbidity (82.2%) and increased sludge settling velocity about 3 times at high biomass concentration. Irradiation intensity of 0.4 w/cm and sonication mode with interval times of 10 s showed the best results on the performance of the system at MLSS concentration of 8000 mg/L with a sample volume of 3 L.

摘要

在这项研究中，应用了低频高强度超声波（1.8MHz）来提高高 MLSS 浓度下活性污泥的沉降性能。研究了辐照强度、超声模式、MLSS 浓度和样品体积对中试规模沉降柱中污泥物理特性的影响，以优化条件。结果表明，高频超声波可降低污泥高度（44%）和出水浊度（82.2%），并在高生物量浓度下使污泥沉降速度提高约 3 倍。在 MLSS 浓度为 8000mg/L、样品体积为 3L 的情况下，辐照强度为 0.4w/cm 和间隔时间为 10s 的超声模式对系统性能的效果最好。