YU Hai-kuan,LI Xing,ZHOU Zhi-wei,et al.Operation Characteristics and Optimization of PVC and PVDF Membranes in Full-scale Ultrafiltration Drinking Water Treatment Plant[J].China Water & Wastewater,2021,37(1 1):28-33.
Operation Characteristics and Optimization of PVC and PVDF Membranes in Full-scale Ultrafiltration Drinking Water Treatment Plant
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第37卷
Number:
1 1
Page:
28-33
Column:
Date of publication:
2021-01-01
- Keywords:
- ultrafiltration; membrane material; membrane fouling; membrane flux; optimization of operating parameters
- Abstract:
- Ultrafiltration (UF) technology has been widely used in various urban water supply treatment plants and the quality of UF permeate is higher than that of conventional drinking water treatment process.The significant differences have been consisted in the operating cycle, membrane flux, transmembrane pressure (TMP) among UF membranes with different materials. According to respective characteristics of UF membranes to adjust the operating parameters is necessary for its long-term stable operation. The long-term operation characteristics of UF system in a full-scale drinking water treatment plant (DWTP) in Shandong was analyzed. The pore structure, flux, TMP and filtration resistance of polyvinyl chloride (PVC) and polyvinylidene fluoride (PVDF) membranes were compared.After adjusting and optimizing the operation parameters of the UF system, the operation verification was carried out for a long time.The results showed that membrane fouling caused by different pore diameter and structure was the main factor for the different filtration characteristics between PVC and PVDF membranes.In the constant filtration cycle operation mode, the flux acceleration decay period of PVC membrane was 82-220 min,which caused the membrane flux to attenuate by 9.14%, and formed a permanent decay membrane flux of about 5%.While flux attenuation of PVDF membrane was not obvious.Because of these situations, the operation of PVC and PVDF membranes system appeared a significant difference, of which the fouling rate of PVC membrane was obviously higher than that of PVDF membrane.When the UF system operated in constant filtration resistance mode, the optimal filtration cycle range of PVC and PVDF membranes were 82-108 minutes and 96-155 minutes, respectively.The filtration cycles of PVC and PVDF membranes at high and low temperatures were adjusted to 110 min,90 min and 150 min, 120 min respectively. At this point, the TMP growth rate and the chemical maintenance cleaning cycle of PVC and PVDF membranes had very good consistency, and the UF system achieved long-term stable operation.Therefore, the research results provide a reference for optimizing operation parameters and keeping cooperative stable operation of different material UF in DWTP.
Last Update:
2021-01-01