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Effect of raw water turbidity variation on performance of gravity driven membrane filtration systems
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Tong WEI1, Min HAN2, Bao-yi TIAN3, Rong-guang LI3, Gang WEN1, Ting-lin HUANG1, Kai LI1, *
China Environmental Science | 2025, 45(6) : 3054 - 3062
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China Environmental Science | 2025, 45(6): 3054-3062
• Water Pollution Control •
Effect of raw water turbidity variation on performance of gravity driven membrane filtration systems
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Tong WEI1, Min HAN2, Bao-yi TIAN3, Rong-guang LI3, Gang WEN1, Ting-lin HUANG1, Kai LI1, *
Affiliations
  • 1.Collaborative Innovation Center of Water Pollution Control and Water Quality Security Assurance of Shaanxi Province, Key Laboratory of Northwest Water Resource, Environment and Ecology, Ministry of Education, Xi'an University of Architecture and Technology, Xi'an 710055, China
  • 2.Inner Mongolia Water Resources & Hydropower Engineering Co., Ltd., Hohhot 010020, China
  • 3.Tianjin Water Group Co., LTD, Tianjin 300202, China).
Published: 2025-06-20
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This study investigated the effects of raw water turbidity variation on the stable flux, pollutants removal, and bio-cake layer of gravity flow ultrafiltration (GDM) system. The results showed that the increase of raw water turbidity led to a significant decrease in the flux of GDM system, but a new stable flux can be achieved in 17~30 days. Compared to control GDM with low influent turbidity (1.8~3.7NTU), the increase of raw water turbidity to 10, 50 and 100 NTU reduced the stable flux of GDM system by 15%, 36% and 61%, respectively. The macromolecular organic matter carried by particles was degraded by microorganisms in the bio-cake layer to low molecular weight organic matter, which passed through the membrane and resulted in increase of dissolved organic matter in the effluent with the increase of raw water turbidity. The ammonia removal rate of GDM system reached more than 80% after 9days of start-up, and the temporary decrease in ammonia nitrogen removal capacity occurred due to the increase of raw water turbidity. However, it recovered after 7~11days of adaptation period. With the increase of raw water turbidity, the thickness of bio-cake layer increased by 1.8 to 7.9 times and the microbial extracellular polymeric substances increased by 37 to 98%. Meanwhile, the microbial community structure underwent certain changes. This study shows that GDM system has certain adaptability to increase of raw water turbidity.

Gravity-driven membrane (GDM)  /  raw water turbidity  /  stable flux  /  ammonia  /  bio-cake layer
Tong WEI, Min HAN, Bao-yi TIAN, Rong-guang LI, Gang WEN, Ting-lin HUANG, Kai LI. Effect of raw water turbidity variation on performance of gravity driven membrane filtration systems[J]. China Environmental Science, 2025 , 45 (6) : 3054 -3062 .
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Year 2025 volume 45 Issue 6
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Article Info
  • Receive Date：2024-11-18
  • Online Date：2026-02-27
  • Published：2025-06-20
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  • Received：2024-11-18
Funding
Affiliations
    1.Collaborative Innovation Center of Water Pollution Control and Water Quality Security Assurance of Shaanxi Province, Key Laboratory of Northwest Water Resource, Environment and Ecology, Ministry of Education, Xi'an University of Architecture and Technology, Xi'an 710055, China
    2.Inner Mongolia Water Resources & Hydropower Engineering Co., Ltd., Hohhot 010020, China
    3.Tianjin Water Group Co., LTD, Tianjin 300202, China).
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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