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

Active Publication Date: 2015-07-29
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problem of low removal rate of estradiol in the constructed wetland system, the present invention provides a method for removing estradiol in the tail water of sewage treatment plant by using Fe(III) to strengthen the constructed wetland

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention discloses a method for removing estradiol in tail water of a sewage treatment plant by using an Fe(III)-reinforced constructed wetland. A proper amount of Fe(III) (goethite or hematite) is added to a constructed wetland system, an Fe(III)-microorganism interaction system is constructed, the electron transfer efficiency of microorganisms is improved, and the capacity of the constructed wetland for removing the estradiol in the tail water of the sewage treatment plant is reinforced. The estradiol in the tail water of the sewage treatment plant is effectively removed by the aid of the constructed wetland, and eco-environment risks of recycling of the tail water of the sewage treatment plant are greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering sewage treatment. The invention discloses a method for removing estradiol in the tailwater of a sewage treatment plant. Specifically, it discloses a method for removing estradiol in the tailwater of a sewage treatment plant by strengthening the artificial wetland through the interaction between Fe(III) and microorganisms. method. Background technique [0002] Estradiol is a typical endogenous steroidal estrogen, and 10 ng / L of estradiol in the water environment shows strong ecological (physiological) toxicity, causing male infertility, female reproductive organ tumors, precocious puberty in children, wild Decreased reproductive capacity of animals, feminization of aquatic organisms, etc. At present, many countries in Europe have established standards to limit the emission concentration to no more than 10 ng / L. [0003] Estradiol in the environment mainly comes from the excreta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/32C02F3/28C02F3/34
CPCC02F3/28C02F3/32C02F3/34C02F2101/34Y02W10/10
Inventor 张继彪田云飞黄德英栾晓男黄威郑正
Owner FUDAN UNIV
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