EFFECT OF FINE SAND RATIO ON FILTRATION PERFORMANCE OF UNIFORMLY GRADED QUARTZ SAND FILTER MEDIA

DU Yiming; LI Kai; HUANG Tinglin; LEI Chunyuan; LU Lei; WANG Zhiyong; WANG Pengfei

doi:10.13205/j.hjgc.202211003

Volume 40 Issue 11

Nov. 2022

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2022 > 40(11): 19-25

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DU Yiming, LI Kai, HUANG Tinglin, LEI Chunyuan, LU Lei, WANG Zhiyong, WANG Pengfei. EFFECT OF FINE SAND RATIO ON FILTRATION PERFORMANCE OF UNIFORMLY GRADED QUARTZ SAND FILTER MEDIA[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(11): 19-25. doi: 10.13205/j.hjgc.202211003

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EFFECT OF FINE SAND RATIO ON FILTRATION PERFORMANCE OF UNIFORMLY GRADED QUARTZ SAND FILTER MEDIA

doi: 10.13205/j.hjgc.202211003

DU Yiming^1,2,3,
LI Kai^1,2,3,
HUANG Tinglin^{1,2,3
,
,},
LEI Chunyuan⁴,
LU Lei⁵,
WANG Zhiyong⁵,
WANG Pengfei⁵

1. School of Environment and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China;
2. Shanxi Key Laboratory of Environmental Engineering, Xi'an 710055, China;
3. Key Laboratory of Northwest Water Resource, Environment and Ecology, Ministry of Education, Xi'an 710055, China;
4. Xi'an Tap Water Co., Ltd., Xi'an 710002, China;
5. Leyouyuan Water Plant of Xi'an Tap Water Co., Ltd, Xi'an 710054, China

Received Date: 2021-11-26
Available Online: 2023-03-24

Abstract

Abstract

Quartz sand filtration is the most commonly used technology to remove particulates in water. Among them, uniform gradation filter media is widely used because of its strong dirt holding capacity and long filtration cycle. However, in the current engineering design standard, the effective particle size (d₁₀) and uniformity coefficient (K₆₀) of the uniformly graded filter media are broadly defined. The experiments investigated the turbidity removal and operating characteristics of two uniformly graded filter columns with different ratios of fine sand (<0.9 mm, 0.9~1.0 mm), used powdered activated carbon with different surface potentials and particle sizes as tracer particles, and then studied the retention characteristics of two kinds of filter media for particulate matters. The results showed that:compared with the filter column with a lower proportion of fine sand (16%), the filter column with a higher proportion of fine sand (29%) had a lower turbidity of about 0.2 NTU, and the average increase rate of head loss rose by 8.7%~31.6%, the filter layer had a high mud content of 12%~27%, and the running cycle was 7 h when the filtered water turbidity was used as the control index; in terms of particle retention, the retention of particles by the two filter media decreased as the electronegativity of the particle surface increased and the particle size decreased, among them, the filter media with a higher proportion of fine sand had less impact on particle retention by the nature of the particles, showing a stable retention effect. Therefore, appropriately increasing the proportion of fine sand in the uniformly graded quartz sand filter material may slightly increase the filter head loss, but obtain lower effluent turbidity and a more stable particle retention effect.
- uniformly graded filter media,
- quartz sand,
- fine sand ratio,
- particle properties,
- filter performance

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