Method for purifying domestic wastewater by using willows through super deep flow and application thereof

A domestic wastewater and deep liquid flow technology, applied in the field of environmental restoration, can solve the problems of increased sewage treatment volume, small wastewater treatment volume, and low purification efficiency, and achieve the effect of improving purification efficiency, large nutrient demand, and soft texture

Active Publication Date: 2015-02-25
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In sewage treatment, we need to increase the sewage treatment capacity, neither NFT nor DFT can meet the requirement
Even with DFT, the depth of the nutrient solution is only 10~15cm, but in fact it is still limited by the depth of the nutrient solution. This method treats a small amount of wastewater and has low purification efficiency.

Method used

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  • Method for purifying domestic wastewater by using willows through super deep flow and application thereof
  • Method for purifying domestic wastewater by using willows through super deep flow and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The application example is implemented in the experimental farm of Zhejiang University, and the domestic sewage is taken from the Huajiachi campus of Zhejiang University. The specific steps include the following:

[0027] Collect the branches of the annual Goji willow with no pests and diseases and healthy growth, with a thickness of 1 cm. Cut into 10-20cm cuttings, and the end of the cuttings is obliquely cut. In order to promote rooting and reduce the inhibition of secondary biomass in the roots, soak the cut cuttings in water for 24 hours. Choose a 5cm thick PF board as the carrier, and cut the cuttings directly on the PF board according to the row spacing of 10×15cm.

[0028] Build a water tank with a depth of 50 cm, a width of 45 cm, and a length of 500 cm. A cement tank with a wall thickness of 6 cm is coated with a waterproof paint to prevent water seepage.

[0029] Move the PF board with cutting strips to the cement tank, and operate according to the following ...

Embodiment 2

[0035] The experiment was carried out in the greenhouse of the experimental farm of Zhejiang University. The cement tank was built with bricks and cement on the ground. The length of the cement tank was 5 m, the width was 40 cm, and the depth was 50 cm. The tank wall was coated with waterproof paint to prevent water seepage .

[0036] The 1-year-old branches of Willow barbarum were collected, with a thickness of 1 cm, and made into 10 cm cuttings, which were neatly inserted on phenolic foam boards with a thickness of 3 cm at a plant spacing of 10 × 15 cm (foam boards with a length and width suitable for sinks).

[0037] Move the PF board with cutting strips to the cement tank,

[0038] In the first stage, the cement tank is filled with tap water to a depth of 10 cm to root the cuttings. The root system is well developed and the seedling height is 30 cm.

[0039] Then inject Huajiachi lake water (N concentration is 15.28 mg l -1 , with a P concentration of 15 mg l -1 ). Us...

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Abstract

The invention provides a method for purifying domestic wastewater by using willows through super deep flow, which comprises the following steps: restoring eutrophic surface water through a super deep flow method by selecting red willows with excellent flooding tolerance; taking twigs of annual robust willows, and cutting into cutting slips with a length of 10-15cm; by taking a phenolic foam board as a carrier, planting the willow slips, and pre-culturing to accelerate rootage; transferring the willow seedlings into a tank containing domestic wastewater, wherein the contact area of the rhizospheres with the water body is enlarged through the deep and developed root systems of the red willows in combination with a super deep flow manner; and enabling a nutrient solution to circularly flow through a pump, thus increasing the oxygen supply to the rhizospheres. According to the red willow-based super deep flow method, nitrogen and phosphorus in a water body are effectively absorbed and purified, the wastewater treatment amount is increased, and the purification efficiency is improved. No secondary pollution is produced; and the aboveground biomass can be periodically harvested for wattling use, thus having high economic benefits and landscape effect.

Description

technical field [0001] The invention belongs to the field of environmental restoration and relates to a method for purifying domestic wastewater by willow ultra-deep sap flow (SDFT). Background technique [0002] Eutrophication of water bodies has gradually become the most concerned environmental problem in many contemporary countries, and many lakes, rivers and reservoirs have suffered from eutrophication to varying degrees. In my country, due to population growth and the rapid development of industry and agriculture, a large amount of nutrient-rich substances are directly discharged into water bodies, resulting in varying degrees of eutrophication in water bodies. The eutrophication of the water body leads to the destruction of the structure of the water body ecosystem and the deterioration of the ecological function. At the same time, eutrophication will also cause water shortage, and the harmful substances produced by eutrophication will also cause harm to human health....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/32
Inventor 杨卫东杨肖娥赵凤亮丁哲利曾峥张新成
Owner ZHEJIANG UNIV
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