Membrane fouling in thermophilic aerobic membrane distillation bioreactor treating hospital wastewater

IF 1 4区环境科学与生态学 Q4 WATER RESOURCES

Water SA Pub Date : 2022-10-26 DOI:10.17159/wsa/2022.v48.i4.3930

Elif İnce, M. Ince, Handenur Yaşar, Yasin Abdullah Uslu

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引用次数: 1

Abstract

In the membrane distillation bioreactor (MDBR) process, flux increases with increasing feed temperature, but the presence of microorganisms limits the feed temperature. Also, the accumulation of cells and other substances on the membrane surface can affect the efficiency of MDBR. In this study, hospital wastewater was treated by thermophilic activated sludge MDBR. In the MDBR, the initial flux was 7.87 L‧m−2·h−1 and the stable flux was 3.88 L‧m−2·h−1. The particle size, zeta potential and hydrophobicity of the activated sludge in MDBR were 2.25 µm, −14 mV and 24%, respectively. In addition, EPS (extracellular polymeric substances) and SMP (soluble microbial products), having a significant effect on membrane fouling, were determined to be 201.50 mg·L−1 and 669.35 mg·L−1 in MDBR, respectively. Contact angle, FTIR (Fourier transform infrared), SEM (scanning electron microscope) and EDX (energy dispersive X-ray spectroscopy) measurements were also made on a virgin membrane and used membrane. Analysis of EDX, SEM and F-TIR showed that the membrane fouling was caused by CaCO3 and EPS.

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嗜热好氧膜蒸馏生物反应器处理医院废水的膜污染

在膜蒸馏生物反应器(MDBR)过程中，通量随进料温度的升高而增加，但微生物的存在限制了进料温度。此外，细胞和其他物质在膜表面的积聚也会影响MDBR的效率。本研究采用热敏活性污泥MDBR处理医院废水。在MDBR中，初始通量为7.87 L·m−2·h−1，稳定通量为3.88 L·m−2·h−1。MDBR中活性污泥的粒径为2.25µm, zeta电位为- 14 mV，疏水性为24%。此外，胞外聚合物(EPS)和可溶性微生物产物(SMP)对膜污染有显著影响，MDBR中的EPS和SMP分别为201.50 mg·L−1和669.35 mg·L−1。对原始膜和使用过的膜进行了接触角、FTIR(傅里叶变换红外)、SEM(扫描电子显微镜)和EDX(能量色散x射线光谱)测量。EDX、SEM和F-TIR分析表明，膜污染是由CaCO3和EPS引起的。

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来源期刊

Water SA 环境科学-水资源

CiteScore

2.80

自引率

6.70%

发文量

审稿时长

18-36 weeks

期刊介绍： WaterSA publishes refereed, original work in all branches of water science, technology and engineering. This includes water resources development; the hydrological cycle; surface hydrology; geohydrology and hydrometeorology; limnology; salinisation; treatment and management of municipal and industrial water and wastewater; treatment and disposal of sewage sludge; environmental pollution control; water quality and treatment; aquaculture in terms of its impact on the water resource; agricultural water science; etc. Water SA is the WRC’s accredited scientific journal which contains original research articles and review articles on all aspects of water science, technology, engineering and policy. Water SA has been in publication since 1975 and includes articles from both local and international authors. The journal is issued quarterly (4 editions per year).