CN108046411B

CN108046411B - Internal electricity generation outward turning type water flow constructed wetland sewage purification system

Info

Publication number: CN108046411B
Application number: CN201810010303.XA
Authority: CN
Inventors: 白少元; 丁海静; 丁彦礼; 游少鸿; 吕涛
Original assignee: Guilin University of Technology
Current assignee: Guilin University of Technology
Priority date: 2018-01-05
Filing date: 2018-01-05
Publication date: 2020-02-18
Anticipated expiration: 2038-01-05
Also published as: CN108046411A

Abstract

The invention discloses an internal electricity generation outward turning type water flow constructed wetland sewage purification system. Comprises a water inlet pipe, a double-layer tank body, aquatic plants, a porous water collecting pipe, a rotatable elbow and a U-shaped drain pipe. The sewage firstly enters the bottom of the electricity generation inner layer area, and organic pollutants in the sewage are degraded by electricity generation microorganisms to release electrons; the water flow flows upwards, the concentration of dissolved oxygen is increased, nitrification and denitrification are carried out when the water flow reaches the top of the electrogenesis inner layer area, the water flow flows into the outer layer area in an auxiliary mode, the inclination degree of the U-shaped drain pipe is changed by adjusting the rotatable elbow, the saturation/non-saturation state of the non-electrogenesis outer layer is controlled, reoxygenation is accelerated, and pollutants such as phosphorus in water are further removed through filtering, adsorption and coprecipitation. The invention combines the microbial fuel cell technology with the traditional artificial wetland, exerts the advantages of the microbial fuel cell technology and the traditional artificial wetland in the organic matter degradation and denitrification processes, and has no energy consumption and no external circuit in the whole process.

Description

Internal electricity generation outward turning type water flow constructed wetland sewage purification system

Technical Field

The invention belongs to the field of sewage treatment, and particularly relates to an internal electricity generation outward turning type water flow constructed wetland sewage purification system.

Background

With the rapid development of social economy, the water environment situation in China is increasingly severe. Many problems caused by water pollution are worried, and the remediation work of the polluted water is carried out in succession in various places. Under the condition, the point source pollution treatment of cities achieves certain results, but the problem of water pollution is increasingly highlighted in vast rural areas. Rural sewage treatment has become the dominant cause of the current water environment industry.

Rural pollution has the characteristics of large quantity, wide range, dispersibility, spatial heterogeneity and the like, and the rural pollution treatment and operation maintenance technology is weak in strength, so that a water treatment technology with low investment and operation cost, good treatment effect, stable operation and simple maintenance and management is urgently needed.

The artificial wetland is one of the ecological restoration methods, has the advantages of low construction and operation cost, simple maintenance and the like compared with the traditional secondary biochemical treatment, and is suitable for the sewage treatment of towns or villages with low technical management level and small scale. However, engineering practice finds that in order to ensure the removal of carbon and nitrogen in water, a large area is usually required to complete the organic carbon removal and nitrification and denitrification processes, and the engineering popularization of the technology is limited.

Aiming at the problem, the invention compactly controls the processes of organic carbon metabolism, microbial denitrification, adsorption, coprecipitation and dephosphorization in the sewage in the same constructed wetland through the internally-generated electricity-outward-turning type water flow constructed wetland sewage purification system, and realizes high-efficiency removal. The system has the advantages of investment saving, convenient operation and management and beautiful function, and is particularly suitable for treating distributed domestic sewage and industrial wastewater taking carbon, nitrogen and phosphorus as pollutants.

Disclosure of Invention

The invention aims to provide an internal electricity generation and outward turning type water flow constructed wetland sewage purification system aiming at the problems that the existing constructed wetland technology is not compact in structure and occupies a large area.

The invention is realized by the following steps: the sewage purification system of the internal electricity generation outward turning type water flow constructed wetland comprises a water inlet pipe, a double-layer tank body, aquatic plants, a porous water collecting pipe, a rotatable elbow and a U-shaped drain pipe.

The double-layer cell body comprises an electricity generating inner layer and a non-electricity generating outer layer, wherein the cross sections of the electricity generating inner layer and the non-electricity generating outer layer are circular or polygonal; the ratio of the cross-sectional area of the electricity generating inner layer to the cross-sectional area of the non-electricity generating outer layer is 5:1-1: 1.

The electrogenesis inner layer is connected with the water inlet pipe, conductive particle filler is filled in the electrogenesis inner layer, the conductive particle filler is one of activated carbon, biological carbon, coke and metal slag, and the particle size of the conductive particle filler is 1-10 mm;

the non-electrogenesis outer layer is connected with effluent, the non-electrogenesis outer layer is filled with non-conductive particle fillers, the non-conductive particle fillers are one of quartz sand, limestone, zeolite and volcanic rock, the particle size of the non-conductive particle fillers is 5-20mm, aquatic plants are planted on the conductive particles and the non-conductive particle fillers, and the aquatic plants are one of canna, reed and Thalia scholaris.

The porous water collecting pipe is connected with the U-shaped drain pipe, and a rotatable elbow is arranged at the part of the bottom of the U-shaped drain pipe, which extends out of the double-layer tank body; the inclination degree of the U-shaped drain pipe is changed by adjusting the rotatable elbow, so that the water level in the non-electrogenesis outer layer filler is controlled to be in a saturated/unsaturated state, and reoxygenation is increased.

The steps of utilizing the device to process sewage treatment are as follows:

firstly, sewage enters the bottom of an electricity generating inner layer area, organic pollutants in the sewage are metabolized by electricity generating microorganisms to release electrons, and therefore the sewage becomes an anode of a microbial fuel cell, and efficient degradation of organic matters is completed.

And secondly, the water flow flows upwards, the concentration of dissolved oxygen is continuously increased to the top of the electricity generation inner layer area (the cathode area of the microbial fuel cell), and the nitrification and denitrification processes are carried out.

And thirdly, water flows around to enter the non-electrogenesis outer layer area in an auxiliary flow mode, the water level is adjusted by utilizing the rotatable U-shaped drain pipe, reoxygenation is accelerated, and pollutants such as phosphorus in water are further removed through the functions of filtering, adsorption, coprecipitation and the like.

The invention combines the microbial fuel cell technology and the traditional artificial wetland closely, gives full play to the advantages of the microbial fuel cell technology and the traditional artificial wetland in the processes of organic matter degradation and denitrification, and compactly controls the processes of high-efficiency organic carbon metabolism, microbial denitrification, adsorption, coprecipitation and phosphorus removal in the same artificial wetland.

Drawings

FIG. 1 is a schematic diagram of the non-electrogenic outer layer of the embodiment of the present invention at an initial water level.

FIG. 2 is a schematic diagram of the non-power generating outer layer after adjusting the water level according to the embodiment of the invention.

The labels in the figure are: 1-water inlet pipe; 2-double-layer tank body; 2 a-an electrogenic inner layer; 2 b-a non-electrogenic outer layer; 3-aquatic plants; 4-a porous water collecting pipe; 5-rotatable elbow; 6-U-shaped drain pipe; 7-water level.

Detailed Description

The following are only preferred embodiments of the present invention and are not intended to limit the present invention in any way.

Example (b):

as shown in fig. 1, the internal electricity generation outward turning type water flow constructed wetland sewage purification system comprises a water inlet pipe 1, a double-layer tank body 2, aquatic plants 3, a porous water collecting pipe 4, a rotatable elbow 5 and a U-shaped drain pipe 6.

The double-layer cell body 2 comprises an electrogenesis inner layer 2a and a non-electrogenesis outer layer 2b, wherein the section of the electrogenesis inner layer 2a is circular, the diameter is 40cm, and the section of the non-electrogenesis outer layer 2b is circular, the diameter is 50 cm; the electrogenesis inner layer 2a is connected with the water inlet pipe 1, the electrogenesis inner layer 2a is filled with coke particle filler, the particle size is 5-8mm, and the filling height is 90 cm; the non-electrogenesis outer layer 2b is connected with effluent, quartz sand filler is filled in the non-electrogenesis outer layer 2b, the particle size is 8-10mm, and the filling height is 90 cm; aquatic plants 3 are planted on the coke particles and the quartz sand filler, and the aquatic plants 3 are canna.

The water inlet pipe 1 is arranged at the center of the bottom of the electrogenesis inner layer 2a, the diameter of the water inlet pipe is 15mm, the annular porous water collecting pipe 4 is paved at the bottom of the non-electrogenesis outer layer 2b, the diameter of the porous water collecting pipe 4 is 20mm, the annular diameter of the porous water collecting pipe is 45cm, the hole interval is 5cm, the whole artificial wetland is made of organic glass, the effective volume is 90L, the hydraulic retention time is 1d, and the daily treatment capacity is 90L/d.

The porous water collecting pipe 4 is connected with a U-shaped water discharging pipe 6, and a rotatable elbow 5 is arranged at the part of the bottom of the U-shaped water discharging pipe 6 extending out of the double-layer tank body.

The steps of utilizing the system to process sewage treatment are as follows:

firstly, sewage enters the bottom of the electricity generation inner layer 2a area, organic pollutants in the sewage are metabolized by electricity generation microorganisms to release electrons, and therefore the sewage becomes an anode of a microbial fuel cell, and efficient degradation of organic matters is completed.

Secondly, the water flow flows upwards, the concentration of the dissolved oxygen is continuously increased to the top of the area 2a of the electrogenesis inner layer (the cathode area of the microbial fuel cell), and the nitrification and denitrification processes are carried out.

Thirdly, the water flows into the non-electrogenesis outer layer 2b area along the periphery in an auxiliary flow mode, the inclination degree (shown in figure 2) of the U-shaped drain pipe 6 is changed by adjusting the rotatable elbow 5, so that the water level 7 in the filler of the non-electrogenesis outer layer 2b is controlled to be in a saturated/unsaturated state, reoxygenation is increased, and pollutants such as phosphorus in water are further removed through the functions of filtering, adsorption, coprecipitation and the like.

Claims

1. An internal electricity generation outward turning type water flow artificial wetland sewage purification system is characterized in that the internal electricity generation outward turning type water flow artificial wetland sewage purification system comprises a water inlet pipe (1), a double-layer tank body (2), aquatic plants (3), a porous water collecting pipe (4), a rotatable elbow (5) and a U-shaped water discharging pipe (6);

the double-layer cell body (2) comprises an electricity generating inner layer (2 a) and a non-electricity generating outer layer (2b), wherein the cross sections of the electricity generating inner layer (2 a) and the non-electricity generating outer layer (2b) are circular or polygonal; the ratio of the cross sectional areas of the electricity generating inner layer (2 a) and the non-electricity generating outer layer (2b) is 5:1-1: 1;

the electricity generating inner layer (2 a) is connected with the water inlet pipe (1), the electricity generating inner layer (2 a) is filled with conductive particle filler, the conductive particle filler is one of activated carbon, biological carbon, coke and metal slag, and the particle size of the conductive particle filler is 1-10 mm;

the non-electrogenesis outer layer (2b) is connected with effluent, the non-electrogenesis outer layer (2b) is filled with non-conductive particle filler, the non-conductive particle filler is one of quartz sand, limestone, zeolite and volcanic rock, and the particle size of the non-conductive particle filler is 5-20 mm; aquatic plants (3) are planted on the conductive particles and the non-conductive particle fillers, and the aquatic plants (3) are one of canna, reed and thalia aurantiaca;

the porous water collecting pipe (4) is connected with the U-shaped drain pipe (6), and a rotatable elbow (5) is arranged at the part of the bottom of the U-shaped drain pipe (6) extending out of the double-layer tank body;

the steps of utilizing the system to process sewage treatment are as follows:

firstly, sewage enters the bottom of an electricity generating inner layer area, organic pollutants in the sewage are metabolized by electricity generating microorganisms to release electrons, so that the sewage becomes an anode of a microbial fuel cell and the degradation of organic matters is completed;

secondly, the water flow flows upwards, the concentration of dissolved oxygen is continuously increased to the top of the electricity generation inner layer area, namely the cathode area of the microbial fuel cell, and the processes of nitrification and denitrification are carried out;

and thirdly, water flows into the non-electrogenesis outer layer area in a peripheral auxiliary flow manner, the inclination degree of the U-shaped drain pipe is changed by adjusting the rotatable elbow, so that the water level in the non-electrogenesis outer layer filler is controlled to be in a saturated/unsaturated state, reoxygenation is increased, and phosphorus pollutants in the water are further removed through the filtering, adsorbing and coprecipitating actions.