Properties of Fouled Membrane by Hospital Wastewater and Its Cleaning

doi:10.3969/j.issn.1673-1689.2019.04.013

Home > Archive>Volume 38, Issue 4, 2019 >84-89. DOI:10.3969/j.issn.1673-1689.2019.04.013

Properties of Fouled Membrane by Hospital Wastewater and Its Cleaning
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                        10.3969/j.issn.1673-1689.2019.04.013
                    
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With a large amount of hazardous matter，such as virus，hospital wastewater experiences frequent variation in wastewater quality and quantity. Membrane bioreactor（MBR） technology has been extensively used in industrial wastewater treatment plants. However，membrane fouling always is one of key bottlenecks to obstacle the stable operation of MBR. Aimed at fouled membrane from hospital wastewater treatment plant，the optimal chemical cleaning strategy can be determined based on surface fouling element analysis using energy dispersive x-ray spectroscopy（EDX）. It is helpful for chemical cleaning of fouled membrane modules in wastewater treatment plant. The results showed that，compared with other seasons，the elements in/on fouled membrane surface in autumn season was most complicated，and organic elements were overlapped with inorganic. Under room temperature，organic and inorganic elements were effectively removed by 0.5% citric acid and 0.1% sodium hypochlorite，respectively. Concerning the cleaning order，the better method was firstly citric acid cleaning followed by sodium hypochlorite. The removal of inorganic elements by citric acid made fouling layer softer and was favorable for subsequent sodium hypochlorite cleaning. The element components of cleaned membrane surface were similar to those of new one. Also，the porosity rate，average pore size and contact angle of cleaned membrane with 0.858，0.104 ?滋m and 69.20±0.115° was approximate to those of new one.

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LI Xiufen, ZHOU Qiang, CHEN Chunmei, ZHANG Linzhong, REN Yueping, SHANG Haibo, WANG Xinhua. Properties of Fouled Membrane by Hospital Wastewater and Its Cleaning[J]. Journal of Food Science and Biotechnology,2019,38(4):84-89.

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