Influence of Particle Size of River Sand on the Decontamination Process in the Slow Sand Filter Treatment of Micro-Polluted Water
1
State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100038, China
2
Department of Irrigation and Drainage, China Institute of Water Resources and Hydropower Research, Beijing 100038, China
*
Author to whom correspondence should be addressed.
Academic Editor: Efthimia A. Kaprara
Water 2022, 14(1), 100; https://doi.org/10.3390/w14010100
Received: 3 December 2021
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Revised: 23 December 2021
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Accepted: 30 December 2021
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Published: 4 January 2022
(This article belongs to the Special Issue Application of Sustainable Chemical and Biological Methods for Pollutants Removal from Water)
Slow sand filters (SSFs) have been widely used in the construction of water plants in rural areas. It is necessary to find river sand of suitable particle size to improve SSF treatment of micro-polluted water so as to ensure the effective and long-term operation of these plants. In this study, SSF1# (particle size of 0.1–0.5 mm), SSF2# (particle size of 0.5–1 mm), and SSF3# (particle size of 1–1.5 mm) were selected. The physical absorption, CODMn and NH4+-N removal effect, and microbial community were analyzed. According to Langmuir and Freundlich adsorption model fitting, the smaller the particle size of the river sand, the more pollutants are adsorbed under the same conditions. SSF1# has the shortest membrane-forming time, highest CODMn and NH4+-N removal rate, and highest Shannon estimator, indicating that there are more abundant microbial species in the biofilm. Mesorhizobium, Pannonibacter, Pseudoxanthomonas, Aquabacterium, Devosia, and other bacteria have different proportions in each system, each forming its own stable biological chain system. The effluent quality of the three SSFs can meet drinking water standards. However, river sand with a particle size range of 0.1–0.5 mm is easily blocked, and thus the recommended size range for SSF is 0.5–1 mm.
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Keywords:
slow sand filter; particle size; river sand; ammonia nitrogen; removal rate; microbial community
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MDPI and ACS Style
Ji, X.; Zhao, C.; Lv, Y.; Yang, J.; Li, B. Influence of Particle Size of River Sand on the Decontamination Process in the Slow Sand Filter Treatment of Micro-Polluted Water. Water 2022, 14, 100. https://doi.org/10.3390/w14010100
AMA Style
Ji X, Zhao C, Lv Y, Yang J, Li B. Influence of Particle Size of River Sand on the Decontamination Process in the Slow Sand Filter Treatment of Micro-Polluted Water. Water. 2022; 14(1):100. https://doi.org/10.3390/w14010100
Chicago/Turabian StyleJi, Xuemei, Cui Zhao, Yufeng Lv, Jifu Yang, and Bin Li. 2022. "Influence of Particle Size of River Sand on the Decontamination Process in the Slow Sand Filter Treatment of Micro-Polluted Water" Water 14, no. 1: 100. https://doi.org/10.3390/w14010100
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