2. Methods
2.1. Device and synthetic water
A laboratory-scale biofilter was used to carry out a series of
experiments, and the experimental equipment of the biofilter is
shown in Fig. 1. A Plexiglas column with a diameter of 15 cm
was used for the laboratory-scale biofilter. The supporting layer
of cobblestone at the bottom of the biofilter was 5 cm high, and
the particle size of the cobblestones was 0.5–1 cm. Quartz sand,
with a particle size of 0.6–1.2 mm, was used as a filtration material,
and the filter bed was 32 cm high. The other reactor components
consisted of an influent, a backwashing tank, and two peristaltic
pumps.
2. Methods2.1. Device and synthetic waterA laboratory-scale biofilter was used to carry out a series ofexperiments, and the experimental equipment of the biofilter isshown in Fig. 1. A Plexiglas column with a diameter of 15 cmwas used for the laboratory-scale biofilter. The supporting layerof cobblestone at the bottom of the biofilter was 5 cm high, andthe particle size of the cobblestones was 0.5–1 cm. Quartz sand,with a particle size of 0.6–1.2 mm, was used as a filtration material,and the filter bed was 32 cm high. The other reactor componentsconsisted of an influent, a backwashing tank, and two peristalticpumps.
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