Integrated riparian system for on-site treatment of river/lake silt and application thereof

Patent metadata

Field	Value
Publication number	US-12030798-B2
Application number	US-202117527257-A
Country	US
Kind code	B2
Filing date	Nov 16, 2021
Priority date	Jun 21, 2019
Publication date	Jul 9, 2024
Grant date	Jul 9, 2024

Abstract

The disclosure discloses an integrated riparian system for river/lake silt on-site treatment and application thereof, belonging to the technical field of silt treatment. The integrated riparian system includes three subsystems, namely a silt ecological treatment subsystem, a siphon drainage subsystem and a silt leachate advanced treatment subsystem. The silt ecological treatment subsystem is provided with plants, fillers, an aeration pipe and a water collection pipe from top to bottom, and a vent pipe is connected to the water collection pipe. A siphon in the siphon drainage subsystem is retractable and hump-shaped. The silt leachate advanced treatment subsystem includes a first-stage ecological treatment unit upflow wetland and a second-stage ecological treatment unit surface flow wetland. According to the disclosure, dewatering and harmlessness of silt, advanced treatment of silt leachate and purification of part of river/lake water are effectively realized through transpiration and absorption of the plants, filtration and adsorption of the fillers and degradation of microorganisms.

First claim

What is claimed is:

1. An integrated riparian system for river or lake silt on-site treatment, comprising three subsystems, namely, a silt ecological treatment subsystem, a siphon drainage subsystem and a silt leachate advanced treatment subsystem, wherein the silt ecological treatment subsystem is provided with plants, fillers, an aeration pipe and a water collection pipe from top to bottom and equipped with a vent pipe, and the vent pipe is connected to the water collection pipe; a siphon used by the siphon drainage subsystem is retractable and hump-shaped; the silt leachate advanced treatment subsystem comprises two stages of ecological treatment units, namely, an upflow wetland and a surface flow wetland, wherein the upflow wetland is provided with the fillers in layers; the fillers of the silt ecological treatment subsystem comprise a drainage layer, a transition layer, a filter layer and a cover layer from bottom to top; the fillers of the upflow wetland comprise a water inlet layer, a filter layer and a drainage layer from bottom to top; and emergent plants are grown in the silt ecological treatment subsystem, emergent plants and hygrophytes are grown on the upflow wetland of the silt leachate advanced treatment subsystem, and emergent plants, floating-leaved plants and submerged plants are grown in the surface flow wetland.

2. The integrated riparian system according to claim 1 , wherein the drainage layer in the silt ecological treatment subsystem is gravel with a thickness of 10-30 cm and a diameter of 10-30 mm; the transition layer is gravel with a thickness of 10 cm and a diameter of 4-15 mm; the filter layer is volcanic rock with a thickness of 25 cm and a diameter of 0.5-5 mm; and the cover layer is gravel with a thickness of 10 cm and a diameter of 8-20 mm.

3. The integrated riparian system according to claim 1 , wherein a bottom slope of the silt ecological treatment subsystem is 0.1%-0.3%; the water collection pipe is a perforated pipe connected to the vent pipe, the pipes each have an inner diameter of 8-15 cm, the vent pipe is 15-30 cm higher than a tank body, and the water collection pipe and the vent pipe are each wrapped with geotextile; and the aeration pipe is closely attached to the water collection pipe and disposed thereon.

4. The integrated riparian system according to claim 1 , wherein a horizontal inclination angle of an ascending section of the retractable hump-shaped siphon of the siphon drainage subsystem is 30-45°, a height of the siphon is flexibly adjustable in a range of 15-50 cm, a vertex of the hump is 15-35 cm higher than the water collection pipe of the silt ecological treatment subsystem, a water level of effluent of the siphon is 20-40 cm lower than a water level of the water collection pipe, and the siphon has an inner diameter of 8-15 cm.

5. The integrated riparian system according to claim 1 , wherein the water inlet layer of the upflow wetland in the silt leachate advanced treatment subsystem is gravel with a thickness of 10-30 cm and a diameter of 10-30 mm; the filter layer is volcanic rock with a thickness of 15-30 cm and a diameter of 0.5-5 mm; and the drainage layer is gravel with a thickness of 10-30 cm and a diameter of 10-30 mm.

6. The integrated riparian system according to claim 1 , wherein a perforated water inlet pipe and a drainage pipe are respectively disposed in the water inlet layer and the drainage layer of the upflow wetland in the silt leachate advanced treatment subsystem, the pipes have an inner diameter of 8-15 cm, a water level difference between the two pipes is 20-40 cm, and the water level of the water inlet pipe is 40-60 cm lower than a vertex of the hump of the siphon.

7. The integrated riparian system according to claim 1 , wherein the surface flow wetland in the silt leachate advanced treatment subsystem has a same water level as a river or lake.

8. The integrated riparian system according to claim 1 , wherein PE anti-seepage membranes are laid on tank bottoms and tank walls of the silt ecological treatment subsystem and the silt leachate advanced treatment subsystem, and geotextile is laid between the layers of fillers.

9. The integrated riparian system according to claim 1 , wherein the fillers of the silt ecological treatment subsystem are disposed in layers from bottom to top, comprising the drainage layer, the transition layer, the filter layer and the cover layer; the drainage layer is gravel with a thickness of 15 cm and a diameter of 10-30 mm; the transition layer is gravel with a thickness of 10 cm and a diameter of 4-15 mm; the filter layer is volcanic rock with a thickness of 25 cm and a diameter of 0.5-5 mm; the cover layer is gravel with a thickness of 10 cm and a diameter of 8-20 mm; the fillers of the first-stage ecological treatment unit upflow wetland of the silt leachate advanced treatment subsystem are disposed in layers from bottom to top, comprising the water inlet layer, the filter layer and the drainage layer; the water inlet layer is gravel with a thickness of 15 cm and a diameter of 10-30 mm; the filter layer is volcanic rock with a thickness of 20 cm and a diameter of 0.5-5 mm; the drainage layer is gravel with a thickness of 15 cm and a diameter of 10-30 mm; and the emergent plants are grown in the silt ecological treatment subsystem, the emergent plants and the hygrophytes are grown on the upflow wetland of the silt leachate advanced treatment subsystem, and the emergent plants, the floating-leaved plants and the submerged plants are grown in the surface flow wetland.

10. A method of using the integrated riparian system according to claim 1 to treat silt, comprising:
(1) performing a silt ecological treatment, wherein river or lake silt with a water content of higher than 70% is added at a load of 50-80 kg dry matter/(m 2 ·a) and spread in layers on the cover layer of the silt ecological treatment subsystem every 30-60 days with a thickness of not more than 15 cm each time until a tank body is fully filled, a final height of filling being 0.5-1.2 m, and the silt is removed when the water content is reduced to 50% or below, wherein the silt ecological treatment subsystem is equipped with a vent pipe and an aeration pipe inside, an aeration interval is 15-30 days, an aeration rate is 50-100 mL/min, and an aeration time is 1-2 days, thereby realizing dewatering and harmlessness of the silt;
(2) automatically discharging leachate collected by the water collection pipe at the bottom of the silt ecological treatment subsystem to the silt leachate advanced treatment subsystem through the siphon drainage subsystem; and
(3) in the silt leachate advanced treatment subsystem, the leachate being sequentially subjected to two stages of ecological treatment, namely the upflow wetland and the surface flow wetland, discharging effluent into the river or lake after reaching a standard, and river or lake water entering the surface flow wetland when there is insufficient water, thereby realizing purification of part of the river or lake water.

Assignees

• Univ Jiangnan

Inventors

• Li Yifei
• Zou Hua
• Lian Jie
• Ding Jiannan
• Fu Shanfei
• Wang Zhenyu

Classifications

• E03F5/20

  Siphon pipes or inverted siphons (for connections of baths, basins, or the like E03C1/12 {; siphons in dams E02B7/18}) · CPC title

• E03F3/02

  Arrangement of sewer pipe-lines or pipe-line systems · CPC title

• E02D31/006

  Sealing of existing landfills, e.g. using mining techniques · CPC title

• C02F11/02

  Biological treatment · CPC title

• C02F3/32 Primary

  characterised by the animals or plants used, e.g. algae · CPC title