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):28-33.
大型超濾水廠PVC和PVDF膜運行特性差異與優(yōu)化
- Title:
- Operation Characteristics and Optimization of PVC and PVDF Membranes in Full-scale Ultrafiltration Drinking Water Treatment Plant
- 關(guān)鍵詞:
- 超濾; 膜材質(zhì); 膜污染; 膜通量; 參數(shù)調(diào)控
- Keywords:
- ultrafiltration; membrane material; membrane fouling; membrane flux; optimization of operating parameters
摘要:- 超濾技術(shù)已廣泛應用于城鎮(zhèn)給水處理廠，使得飲用水水質(zhì)得到顯著改善。不同材質(zhì)超濾膜的運行周期、膜通量、跨膜壓差（TMP）等的變化規(guī)律會有顯著的差異，需要根據(jù)各自的特點對超濾系統(tǒng)進行運行參數(shù)調(diào)控與優(yōu)化，以保證超濾系統(tǒng)的長期穩(wěn)定運行。分析了山東某大型超濾水廠超濾系統(tǒng)長期運行的特點，對比了PVC膜和PVDF膜孔結(jié)構(gòu)特征、膜通量、跨膜壓差變化趨勢及膜過濾阻力特性，調(diào)控和優(yōu)化超濾系統(tǒng)運行參數(shù)，并進行了長時間的運行驗證。結(jié)果表明，膜孔徑和膜孔結(jié)構(gòu)不同造成的膜污染是PVC膜與PVDF膜過濾特性差異的主要因素，恒定過濾周期運行模式下PVC膜通量加速衰減時段為82~220 min，造成PVC膜通量衰減了9.14%，并形成了約5%的永久衰減膜通量，而PVDF膜的通量衰減并不明顯，使得水廠超濾系統(tǒng)在恒定過濾周期（180 min）運行模式下，出現(xiàn)了PVC膜的污染速率明顯高于PVDF膜、系統(tǒng)的運行工況出現(xiàn)顯著差異的現(xiàn)象。按照恒定過濾阻力模式運行時，PVC膜和PVDF膜的最佳過濾周期范圍分別為82~108 min和96~155 min。水廠超濾系統(tǒng)在恒定過濾阻力運行模式下將PVC膜與PVDF膜在高溫期和低溫期的過濾周期分別調(diào)整為110、90 min和150、120 min，TMP的增長速率和化學維護清洗周期均基本一致，超濾系統(tǒng)實現(xiàn)了長期穩(wěn)定運行。研究成果為我國超濾水廠中不同材質(zhì)超濾膜的運行參數(shù)優(yōu)化及協(xié)同穩(wěn)定運行提供了參考。
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.
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