Method for recovering heavily polluted water body in city by utilizing aeration-to-sediments

A heavy pollution and sediment technology, applied in the field of environmental governance, can solve problems such as secondary pollution, water quality deterioration, and large resource investment, and achieve the effects of reducing treatment costs, accelerating degradation, and reducing the frequency of dredging

Inactive Publication Date: 2012-07-25
SUZHOU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the deficiencies in the prior art, the purpose of the present invention is to propose a method for remediating urban heavily polluted water bodies with sediment aeration, which solves the problem of large input of resources and large investment in water bodies caused by the restoration methods of urban heavily polluted water bodies in the prior art. Problems such as the introduction of secondary pollution and the rapid deterioration of water quality after water restoration measures are stopped

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1 The sediment aeration repair experiment of a certain river section

[0022] This example is used to carry out the experiment of sediment aeration restoration on a heavily polluted river section. This section of the river is a broken-headed bank of a certain campus river, with a length of 35 meters, a river width of 8 meters, a water depth of 1.2 meters, and a bottom mud thickness of about 20 cm. The content of organic matter, ammonia nitrogen, phosphorus, etc. in the water body is high, and black odor often occurs, the water quality is seriously polluted, and the water body basically does not flow.

[0023] A 1cm-thick plexiglass plate was used to enclose an experimental area of ​​5m×5m in the Duotoubang, and the bottom of the glass plate was inserted into the sediment for 20cm, so that there was no water exchange between the inside and outside of the enclosure. A microporous diffusion device is arranged at 5cm below the surface sediment, and a diffusion t...

Embodiment 2

[0027] Embodiment 2 Bottom mud aeration laboratory simulation experiment

[0028] Three plexiglass containers (1.0m×1.0m×1.0m) were used as experimental devices. Spread a certain amount of wet bottom mud (taken from a heavily polluted slow-flowing river) on the bottom of the device. The thickness of the bottom mud is about 10cm, and add the river water of the river to a depth of 70cm. Four microporous aeration heads (bubble size of 1.5 mm to 3 mm) were respectively arranged in the bottom sludge of each device. Each aeration head is 20cm away from the adjacent wall, and the distance between the aeration heads is 60cm. The aerator is used for aeration, and the aeration volume of each device is 15L / min, 20L / min, and 25L / min respectively. The aeration time is 5 hours. During the aeration period, the bottom mud is fully suspended. After the aeration is over, the bottom mud settles naturally.

[0029] After 20 days, in the experimental devices with aeration rates of 15L / min, 20L / ...

Embodiment 3

[0030] The laboratory simulation experiment of embodiment 3 bottom mud aeration time

[0031] Three circular plexiglass containers (d=17cm, h=25cm) were used as experimental devices, 200g of wet bottom mud (taken from a typical eutrophic slow-flow river) and 2.5L of river water were added. The aerator is used to aerate the sediment through the microporous aeration head (1.5mm ~ 3mm), the aeration rate is 5L / min, and the aeration time is 10min, 5h, 9h respectively. During the aeration period, the bottom mud is fully suspended, and after the aeration is over, the bottom mud settles naturally.

[0032] After 30 days of aeration, in the plexiglass containers with aeration times of 10 min, 5 h, and 9 h, the ammonia nitrogen content in the overlying water decreased from 3.75 to 1.88, 1.33, and 2.35 mg / L, and the permanganate index decreased from 11.56 mg / L to 1.56 mg / L respectively. L decreased to 6.64, 4.33, 7.13mg / L, total phosphorus decreased from 0.891mg / L to 0.16, 0.08, 0.665mg / ...

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Abstract

The invention discloses a method for recovering a heavily polluted water body in a city by utilizing aeration-to-sediments. The method comprises the following steps: (1) aeration to sediments: aerating the sediments in the water body by an aerating apparatus to enable the sediments to suspend and utilizing the suspended sediments to adsorb pollutants such as organics, ammonia, nitrogen and phosphorus in the water body, thereby achieving the purpose of oxidation and removal through the aeration method; (2) sedimentation: naturally sedimenting the suspended sediments. According to the method, resource is saved; no chemical or biological risk is brought to the water body; the sediments in the water body are purified via aeration and oxidation manners to reduce the sediment dredging frequency while pollutants in the water body are removed.

Description

technical field [0001] The invention belongs to the technical field of environmental treatment, and in particular relates to a method for restoring urban heavily polluted water bodies with sediment aeration. Background technique [0002] Urban water bodies refer to rivers, inner lakes, park water bodies, etc. in cities, and their typical characteristics are that the water quality is easily affected by urban life, production and social activities, especially directly affected by urban drainage and precipitation runoff. Heavily polluted water body refers to the high content of organic matter, ammonia nitrogen, phosphorus and other pollutants in the water body and sediment, the low transparency of the water body, and the frequent occurrence of black odor or algae bloom. [0003] Generally, there are two main categories of water body restoration methods: one is water quality restoration. Repair methods include changing water, aeration and oxidation, adding engineering bacteria,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F3/34C02F7/00C02F1/72C02F1/52
CPCY02W10/10
Inventor 李大鹏黄勇
Owner SUZHOU UNIV OF SCI & TECH
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