Abstract
In rural areas, inhabitants utilize water cellars to store natural rainwater for drinking, and bio-slow filtration emerges as a fitting approach for treating such small-scale, minimally contaminated drinking water sources. In this study, sodium chloride-activated polymeric ferric sulfate-modified natural zeolite (Z-Na-Fe) was synthesized by impregnation and applied to degrade simulated micropolluted cellar water in bio-slow filtration. The slow filtration column required only 25 d to complete the natural membrane hanging and had the best purification effect and stability. It maintained an average removal rate of 82.81 % for ammonia nitrogen and 77.30 % for phosphorus during the stable operation. The modifications involving sodium chloride and polymerized iron sulfate enhanced zeolite adsorption and increased microbial diversity in the slow filtration column. This study proposes a feasible solution for rural drinking water treatment.
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