Method for removing estradiol in tail water of sewage treatment plant by using Fe(III)-reinforced constructed wetland
A technology for sewage treatment and constructed wetlands, applied in biological water/sewage treatment, water/sludge/sewage treatment, anaerobic digestion treatment, etc. The effect of improving removal capacity and reducing environmental and ecological risks
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Embodiment 1
[0021] Example 1: Construct a subsurface flow constructed wetland system. The aspect ratio of the constructed wetland is 3:1, the depth is 1.0 m, and the wetland is filled with a combined filler with a height of 0.8 m. The filler is composed of zeolite: ceramsite = 1:1 (volume ratio), Add goethite with 1% filler mass to the wetland, and 20 plants / m2 in the wetland 2 Reeds were planted at a density of 2 days, and the tail water of the urban sewage plant was injected into the wetland system at a residence time of 2 days. The concentration of estradiol in the tail water was 100 ng / L. Compared with the wetland system adding goethite (other operating parameters of the constructed wetland remain unchanged), the removal rate of estradiol was increased by about 50%.
Embodiment 2
[0022] Example 2: Construction of a subsurface flow constructed wetland system. The aspect ratio of the constructed wetland is 2:1, the depth is 0.7 m, and the wetland is filled with a combined filler with a height of 0.5 m. The filler is composed of zeolite: ceramsite = 1:1 (volume ratio), Add goethite with 0.2% filler mass to the wetland, and 10 plants / m2 in the wetland 2 Reeds were planted at a density of 0.5 days, and the tail water of the urban sewage plant was injected into the wetland system at a residence time of 0.5 days. The concentration of estradiol in the tail water was 1000 ng / L. Compared with the wetland system adding goethite (other operating parameters of the constructed wetland remain unchanged), the removal rate of estradiol was increased by about 20%.
Embodiment 3
[0023] Example 3: Construction of a subsurface flow constructed wetland system. The aspect ratio of the constructed wetland is 1.5:1, the depth is 1.2 m, and the wetland is filled with a combined filler with a height of 1.0 m. The filler is composed of zeolite: ceramsite = 1:1 (volume ratio), Add 0.5% goethite as filler mass to the wetland, and 8 plants / m2 in the wetland 2 Reeds were planted at a density of 1.5 days, and the tail water of the urban sewage plant was injected into the wetland system at a residence time of 1.5 days. The concentration of estradiol in the tail water was 1500 ng / L, and the average removal rate of estradiol in the wetland system was 75%. Compared with the wetland system adding goethite (other operating parameters of the constructed wetland remain unchanged), the removal rate of estradiol was increased by about 30%.
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