CN111138058A

CN111138058A - Simple method for restoring polluted water body sediment environment

Info

Publication number: CN111138058A
Application number: CN201911292985.9A
Authority: CN
Inventors: 杨永刚; 许玫英; 罗帝洲
Original assignee: Guangdong Detection Center of Microbiology of Guangdong Institute of Microbiology
Current assignee: Guangdong Detection Center of Microbiology of Guangdong Institute of Microbiology
Priority date: 2019-12-16
Filing date: 2019-12-16
Publication date: 2020-05-12

Abstract

The invention discloses a method for restoring the environment of bottom mud of a polluted water body. A hollow conductive pipe is inserted into the bottom sediment of the polluted water body, one end or part of the conductive pipe is buried in the bottom sediment, and the other end or part of the conductive pipe is exposed in the air or the water body. One end of the conductive tube is inserted into the sediment, and the other end of the conductive tube is exposed out of the water surface, so that the air in the tube cavity of the conductive tube is convenient to communicate with the atmospheric environment, water with higher dissolved oxygen concentration can be introduced into the tube, the oxidation-reduction potential in the tube is improved, and the electron transfer in the sediment along the conductive tube is accelerated, thereby being beneficial to the degradation of organic matters, such as polycyclic aromatic hydrocarbon.

Description

Simple method for restoring polluted water body sediment environment

Technical Field

The invention belongs to the technical field of environmental protection, and particularly relates to a simple and convenient method for restoring the environment of polluted water body sediment, which is easy to implement, convenient, effective and low in cost.

Background

Water environment pollution becomes one of the main limiting factors for the development of the economic society of China and seriously threatens the physical health of residents. Water environment management has become a significant demand for ecological civilization construction. In the polluted water body environment, a large amount of non-degradable toxic pollutants are deposited in the bottom mud. Therefore, the treatment of the bottom mud of the polluted water body becomes the key point and the difficulty of the water environment treatment. Although various technical methods for restoring the water body sediment environment are applied, the method has certain defects: such as high cost, secondary pollution, non-sustainability, etc. The method for restoring the bottom mud of the water body has the advantages of low cost, easy implementation, environmental protection and strong practicability.

Microorganisms are the main performers for the degradation of contaminants in the sediment, and inefficient electron transfer processes are the main cause of inhibiting the microbial degradation activity of the sediment. Accelerate the electron transfer of the microorganism and effectively promote the biodegradation process in the bottom mud.

Disclosure of Invention

The invention aims to provide a simple and convenient method for restoring the polluted water body sediment environment, which has low cost, easy implementation, environmental friendliness and strong practicability.

The simple and convenient method for restoring the polluted water body sediment environment is to insert the hollow conductive tube into the polluted water body sediment, wherein one end or part of the conductive tube is buried in the sediment, and the other end or part of the conductive tube is exposed in the air or the water body.

Preferably, the number of the conductive pipes is more than 3, and an array or a pipe network can be formed.

Further preferably, the conductive pipes are transversely connected through hollow conductor pipes to form a pipe network, the conductive pipes are inserted into the bottom mud of the polluted water body, one end or part of the conductive pipes and the pipe network are buried in the bottom mud, and the other end or part of the conductive pipes is exposed in the air or the water body.

The number and the structure of the arrays and the pipe networks can be adjusted according to the area and the thickness of the sediment to be repaired

One end of the conductive tube is inserted into the sediment, and the other end of the conductive tube is exposed out of the water surface, so that the air in the tube cavity of the conductive tube is convenient to communicate with the atmospheric environment, water with higher dissolved oxygen concentration can be introduced into the tube, the oxidation-reduction potential in the tube is improved, and the electron transfer in the sediment along the conductive tube is accelerated, thereby being beneficial to the degradation of organic matters, such as polycyclic aromatic hydrocarbon.

Description of the drawings:

FIG. 1 is a schematic view of the simple method for restoring the bottom sediment environment of a polluted water body of the present invention, wherein A, a ventilation and electric conduction pipe network is formed by electric conduction pipes and hollow conductor pipes; b, placing the ventilating and conducting pipe network in the bottom mud of the water body to play a role;

1. a stainless steel tube; 2. a hollow conductor tube.

FIG. 2 shows the effect of the duct array and the duct network on the degradation of polycyclic aromatic hydrocarbons in the sediment of the water body. (A) Total amount of polycyclic aromatic hydrocarbons; (B) degradation rates of different kinds of polycyclic aromatic hydrocarbons.

The specific implementation mode is as follows:

the following examples are further illustrative of the present invention and are not intended to be limiting thereof.

Example 1:

as shown in FIG. 1, ten hollow stainless steel tubes (inner diameter 1cm, outer diameter 1.5cm, length 20cm) were inserted into sediment (sediment volume: 20 cm. times.20 cm. times.10 cm) of a polluted river of Guangzhou, and the top ends of the tubes were exposed to the water surface to form an array. Pipe network: basically the same as the array, except that the stainless steel pipes 1 in the array are connected through the hollow conductor pipes 2 to form a ventilation and conduction pipe network, the ventilation and conduction pipe network is inserted into the sediment of the water body (the volume of the sediment is 20cm multiplied by 10cm), one end of the pipe network is exposed out of the water surface, the other end of the pipe network is inserted into the sediment, the hollow conductor pipes are all immersed into the sediment, only 4 stainless steel pipes are shown in figure 1, which is only one schematic, and as more than ten pipes are provided, ten stainless steels can be extended according to the 4 stainless steel pipes shown in the figure. As a control, ten glass tubes of the same shape and size were inserted at the same position in the same sediment environment. And (5) operating the treatment and control device for 3 months, and analyzing the degradation condition of the polycyclic aromatic hydrocarbon which is a typical pollutant in the mud.

The results of the experiments show that the concentration of polycyclic aromatic hydrocarbon in the stainless steel tube array (the tube array in fig. 2) is reduced by 16.1% and that in the stainless steel tube network (the aeration and conduction tube network, the tube network in fig. 2) is reduced by 22.6% compared with the concentration of polycyclic aromatic hydrocarbon in the control group of 3100 mug/g, and both devices show better degradation effect on polycyclic aromatic hydrocarbon in high ring (fig. 2B).

Claims

1. A simple and convenient method for restoring the polluted water body sediment environment is characterized in that a hollow conductive tube is inserted into the polluted water body sediment, one end or part of the conductive tube is buried in the sediment, and the other end or part of the conductive tube is exposed in the air or the water body.

2. The simple and convenient method for restoring the polluted water body sediment environment according to claim 1, wherein more than 3 conductive tubes are arranged to form an array or a pipe network.

3. The convenient method for environmental remediation of sediment in contaminated water according to claim 2, wherein the conductive pipes are connected to form a pipe network by hollow conductive pipes, and the conductive pipes are inserted into the sediment in contaminated water, wherein one end or part of the conductive pipes and the pipe network are buried in the sediment, and the other end or part of the conductive pipes is exposed to air or water.