ZHANGGuo-zhen,LUZhao-ming,WANGChao,et al.Treatment Efficiency of Various Biological Slow Filtration Media on Micro-polluted Cellar Water[J].China Water & Wastewater,2025,41(17):63-68.
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Treatment Efficiency of Various Biological Slow Filtration Media on Micro-polluted Cellar Water

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第41卷 Number: 第17期 Page: 63-68 Column: Date of publication: 2025-09-01
Author(s):
ZHANG　Guo-zhen1;  LU　Zhao-ming1; 2;  WANG　Chao1; 2;  WU　Fu-ping1; 2;  ZHOU　Tian-hong1; 2
（1. School of Environmental and Municipal Engineering， Lanzhou Jiaotong University， Lanzhou 730070， China； 2. Key Laboratory of Yellow River Environment in Gansu Province， Lanzhou 730070， China）
Keywords:
micro-polluted cellar water;  biological slow filtration;  element composition of filtration medium;  filter layer thickness
Abstract:
In response to water quality issue in rainwater collection cellars in the arid regions of Northwest China, various materials—including zeolite, modified zeolite, quartz sand, volcanic rock, and tourmaline with different elemental compositions—were employed as biological slow filtration media, and a series of comparative experiments were conducted to evaluate the biofilm formation time of each filtration column, as well as the removal efficiencies of turbidity, NH4+-N, and CODMn under stable operating conditions. Furthermore, the underlying mechanisms were analyzed. When the filtration velocity was maintained at 0.2 m/h, the turbidity removal efficiency of each filter column exceeded 90%. Among them, the volcanic rock filter column demonstrated the highest removal efficiency for NH4+-N and CODMn, with average removal efficiencies of 97.07% and 43.20%, respectively. The presence of Na, K, Ca, Mg, Al, and Fe in the filter media promoted the removal of NH4+-N and CODMn from cellar water. In particular, Mg, Ca, and Fe not only possessed ion exchange capacity but also facilitated microbial growth and aggregation, as well as the enrichment of certain dominant bacterial strains. The removal of pollutants primarily occurred in the upper layer of the filter column. When applying biological slow filtration technology to treat micro-polluted cellar water in rural and small towns of Northwest China, it is advisable to select volcanic rock as the preferred natural filter media. If the filter media require modification, it is recommended to prioritize the use of modifiers containing Fe element.
Last Update: 2025-09-01