CN108059249B

CN108059249B - Method for purifying sewage of external power generation and internal sink type water flow constructed wetland

Info

Publication number: CN108059249B
Application number: CN201810010337.9A
Authority: CN
Inventors: 丁彦礼; 白少元; 游少鸿; 解庆林
Original assignee: Guilin University of Technology
Current assignee: Hengsheng Water Environment Treatment Co ltd
Priority date: 2018-01-05
Filing date: 2018-01-05
Publication date: 2020-02-18
Anticipated expiration: 2038-01-05
Also published as: CN108059249A

Abstract

The invention discloses a method for purifying sewage of an exoelectric power generation and internal heat exchange type water flow constructed wetland. An artificial wetland is established, which comprises a double-layer pool body, a water inlet pipe, a porous water distribution pipe, a porous water collecting pipe, a rotatable elbow, a U-shaped drain pipe and aquatic plants. The double-layer cell body comprises a non-electrogenesis inner layer and an electrogenesis outer layer. The electricity generating outer layer is connected with the water inlet pipe and filled with conductive particle filler. The non-electrogenesis inner layer is connected with the effluent, non-electrogenesis inner layer is filled with non-conductive particle filler, and aquatic plants are planted on the filler. The bottom of the electricity generating outer layer is provided with a porous water distribution pipe with an annular structure, and the porous water distribution pipe is connected with a water inlet pipe; porous water collecting pipes with annular structures are laid at the bottom of the non-electrogenesis inner layer and connected with a U-shaped drain pipe, and a rotatable elbow is arranged at the bottom of the U-shaped drain pipe. The invention combines the microbial fuel cell technology with the traditional artificial wetland and controls the processes of high-efficiency organic carbon metabolism, microbial denitrification, adsorption, coprecipitation and phosphorus removal in the same artificial wetland.

Description

Method for purifying sewage of external power generation and internal sink type water flow constructed wetland

Technical Field

The invention belongs to the field of sewage treatment, and particularly relates to a method for purifying sewage of an exoelectric power generation and internal heat exchange type water flow constructed wetland.

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 method for purifying the sewage of the exoelectric power generation and internal sink type water flow constructed wetland, and realizes high-efficiency removal. The method has the advantages of low investment, convenient operation and management, and good appearance, and is especially suitable for treating distributed domestic sewage and industrial wastewater with carbon, nitrogen and phosphorus as pollutants.

Disclosure of Invention

The invention aims to provide a method for purifying sewage of an external electricity generation and internal collection type water flow artificial wetland, aiming at the problems that the prior artificial wetland technology has a non-compact structure and occupies a large area.

The method comprises the following specific steps:

firstly, an outer electricity generation inner gathering type water flow constructed wetland is established, and the outer electricity generation inner gathering type water flow constructed wetland comprises a double-layer pool body, a water inlet pipe, a porous water distribution pipe, a porous water collection pipe, a rotatable elbow, a U-shaped water discharge pipe and aquatic plants.

The double-layer pool body comprises a non-electrogenesis inner layer and an electrogenesis outer layer, and the cross section of the non-electrogenesis inner layer and the cross section of the electrogenesis outer layer are circular or polygonal; the ratio of the cross section of the non-electricity-generating inner layer to the cross section of the electricity-generating outer layer is 1:5-1: 1.

The electricity generating outer layer is connected with the water inlet pipe, the electricity generating outer layer 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 inner layer is connected with effluent, non-electrogenesis inner layer 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 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 bottom of the electricity generating outer layer is provided with a porous water distribution pipe with an annular structure, and the porous water distribution pipe is connected with a water inlet pipe; the bottom of the non-electrogenesis inner layer is paved with a porous water collecting pipe with an annular structure, the porous water collecting pipe is connected with a U-shaped drain pipe, and one end of the U-shaped drain pipe, which extends out of the double-layer tank body, is provided with a rotatable elbow.

And secondly, the sewage firstly enters the bottom of the electricity generating outer layer to be degraded by the electricity generating microorganisms to release electrons, so that the sewage becomes an anode of the microbial fuel cell and the efficient degradation of organic matters is completed.

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

And fourthly, water flows to the central confluence zone and enters the inner layer zone, the inclination degree of the U-shaped drain pipe is changed by adjusting the rotatable elbow, so that the saturated/unsaturated state of the non-electrogenic inner layer is controlled, reoxygenation is accelerated, and pollutants such as phosphorus in water are further removed by 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 structural diagram of an exoelectrogenesis internal sink type water flow constructed wetland sewage purification device at a non-electrogenesis inner layer initial water level according to an embodiment of the invention.

Fig. 2 is a schematic structural diagram of an exoelectrogenic inward-converging type water flow constructed wetland sewage purification device after the water level of the non-electrogenic inner layer is adjusted according to the embodiment of the invention.

The labels in the figure are: 1-double-layer tank body; 1 a-a non-electrogenic inner layer, 1 b-an electrogenic outer layer; 2-water inlet pipe; 3-porous water distribution pipe; 4-a porous water collecting pipe; 5-rotatable elbow; 6-U-shaped drain pipe; 7-water level; 8-aquatic plants.

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):

firstly, as shown in figure 1, an external electricity generation and internal collection type water flow constructed wetland is established, and comprises a double-layer tank body 1, a water inlet pipe 2, a porous water distribution pipe 3, a porous water collection pipe 4, a rotatable elbow 5, a U-shaped water discharge pipe 6 and aquatic plants 8.

The double-layer cell body 1 comprises a non-electrogenesis inner layer 1a and an electrogenesis outer layer 1b, the cross section of the electrogenesis outer layer 1b is circular, the diameter is 50cm, the cross section of the non-electrogenesis inner layer 1a is circular, and the diameter is 30 cm; the electricity generating outer layer 1b is connected with the water inlet pipe 2, and the electricity generating outer layer 1b is filled with coke particle filler with the particle size of 5-8 mm; the non-electrogenesis inner layer 1a is connected with effluent, and quartz sand particle fillers with the particle size of 8-10mm are filled in the non-electrogenesis inner layer 1 a; the filling heights of the non-electrogenesis inner layer 1a and the electrogenesis outer layer 1b are both 90cm, and aquatic plants 8 canna are planted on the coke particles and the quartz sand particle fillers.

The bottom center of the electricity generating outer layer 1b is provided with a porous water distribution pipe 3 with an annular structure, the diameter of the porous water distribution pipe 3 is 15mm, the annular diameter of the porous water distribution pipe is 45cm, the hole spacing is 5cm, and the porous water distribution pipe 3 is connected with the water inlet pipe 2; an annular porous water collecting pipe 4 is laid at the bottom of the non-electrogenesis inner layer 1a, the annular diameter is 25cm, and the hole spacing is 5 cm; the porous water collecting pipe 3 is connected with a U-shaped drain pipe 6, and a rotatable elbow 5 is arranged at one end of the bottom of the U-shaped drain pipe 6, which extends out of the double-layer tank body 1;

the whole artificial wetland is made of organic glass materials, the effective volume is 90L, the hydraulic retention time is 1d, and the daily treatment capacity is 90L/d.

And secondly, the sewage firstly enters the bottom of the electricity generating outer layer 1b to be degraded by electricity generating microorganisms to release electrons, so that the sewage becomes an anode of a microbial fuel cell and the efficient degradation of organic matters is completed.

Thirdly, the water flow flows upwards, the concentration of the dissolved oxygen is continuously increased to the top of the electricity generating outer layer 1b (the cathode region of the microbial fuel cell), and the nitrification and denitrification processes are carried out.

Fourthly, water flows to the center and flows into the non-electrogenesis inner layer 1a area, the inclination degree of the U-shaped drain pipe 6 (as shown in figure 2) is changed by adjusting the rotatable elbow 5, so that the saturation/non-saturation state of the non-electrogenesis inner layer 1a is controlled, reoxygenation is accelerated, and pollutants such as phosphorus in water are further removed through the functions of filtering, adsorption, coprecipitation and the like.

Claims

1. An exoelectric power generation and internal heat exchange type water flow constructed wetland sewage purification method is characterized by comprising the following specific steps:

firstly, establishing an external electricity generation internal collection type water flow constructed wetland, which comprises a double-layer tank body (1), a water inlet pipe (2), a porous water distribution pipe (3), a porous water collection pipe (4), a rotatable elbow (5), a U-shaped water discharge pipe (6) and aquatic plants (8);

the double-layer cell body (1) comprises a non-electrogenesis inner layer (1a) and an electrogenesis outer layer (1b), and the cross section of the non-electrogenesis inner layer (1a) and the cross section of the electrogenesis outer layer (1b) are circular or polygonal; the ratio of the cross section of the non-electricity-generating inner layer (1a) to the cross section area of the electricity-generating outer layer (1b) is 1:5-1: 1;

the electricity generating outer layer (1b) is connected with the water inlet pipe (2), the electricity generating outer layer (1b) 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 inner layer (1a) is connected with effluent, the non-electrogenesis inner layer (1a) 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 (8) are planted on the conductive particles and the non-conductive particle fillers, and the aquatic plants (8) are one of canna, reed and thalia aurantiaca;

the bottom of the electricity generating outer layer (1b) is provided with a porous water distribution pipe (3) with an annular structure, and the porous water distribution pipe (3) is connected with the water inlet pipe (2); an annular porous water collecting pipe (4) is laid at the bottom of the non-electrogenesis inner layer (1a), the porous water collecting pipe (4) is connected with a U-shaped drain pipe (6), and a rotatable elbow (5) is arranged at one end of the bottom of the U-shaped drain pipe (6) extending out of the double-layer tank body;

secondly, the sewage firstly enters the bottom of the electricity generating outer layer (1b) to be degraded by electricity generating microorganisms to release electrons, so that the sewage becomes an anode of a microbial fuel cell to finish the degradation of organic matters;

thirdly, the water flow flows upwards, the concentration of dissolved oxygen is continuously increased to the top of the electricity generation outer layer, namely the cathode area of the microbial fuel cell, and nitrification and denitrification processes occur;

and fourthly, water flows to the center and flows into the non-electrogenesis inner layer (1a) area, the inclination degree of the U-shaped drain pipe (6) is changed by adjusting the rotatable elbow (5), so that the saturation/non-saturation state of the non-electrogenesis inner layer (1a) is controlled, reoxygenation is accelerated, and phosphorus pollutants in water are further removed through the functions of filtering, adsorption and coprecipitation.