CN106830336B - A Circulating Influent Constructed Wetland Sewage Treatment Simulation Device - Google Patents

Abstract

The invention discloses a circulating water inlet artificial wetland sewage treatment simulation device. The device includes a water distribution bucket and a constructed wetland device. The constructed wetland device is mainly composed of a galvanized iron cylinder, which is composed of upper and lower layers, with a bottom plate in the middle. The upper level includes the intake trough, filler area and calamus. The lower layer is the cushion layer. Place a perforated tube in the center of the device. The upper end of the perforated pipe is connected to the water inlet, the lower end is reserved for 80mm through the bottom plate, and then the outlet pipe is connected through a 90-degree elbow. In order to make the water distribution uniform, the water inlet tank adopts the overflow method of triangular weir. The fill in the fill zone consisted of two layers of fill, an upper layer and a lower layer, on which the calamus was planted. The device of the invention is simple in structure and low in cost, and the selected galvanized iron sheet is durable and light in weight, and has better treatment effect on the polluted water body of low-concentration organochlorine pesticide β-HCH.

Description

A Circulating Influent Constructed Wetland Sewage Treatment Simulation Device

technical field

The invention belongs to the field of pollution water treatment, and in particular relates to a circulating water inflow artificial wetland sewage treatment simulation device for treating residual organochlorine pesticide sewage in agricultural runoff.

Background technique

Organochlorine pesticides are recognized as priority environmental pollutants and are also typical persistent organic pollutants. It is difficult to degrade, semi-volatile, bioaccumulative and highly toxic. It can exist for a long time in nature, and its enrichment through the food chain is extremely harmful to human health and the environment. The persistent and semi-volatile nature of these substances also results in their long-distance transport through the atmosphere and water. Isomers of dichlorodiphenyltrichloroethanes (DDTs) o,p'-DDT, p,p'-DDT, o,p'-DDD, o,p'-DDE and p,p' -DDE has been shown to be a potential endocrine disrupting drug and highly carcinogenic foreign substance with increased risk of human liver, pancreas and breast cancer. Among the four isomers of HCHs, including α-HCH, β-HCH, γ-HCH and δ-HCH, α-HCH has been found to cause human neurological disorders, gastrointestinal discomfort and liver damage; while β-HCH has been shown to be the most stable of the four isomers, the most persistent in the natural environment, and has bioaccumulation and chronic toxicity that can cause severe biological and environmental damage s consequence. Organochlorine pesticides have historically been used extensively as agricultural pesticides. Although my country has banned the production and use of some organochlorine pesticides since 1983, they have been produced and used for more than 30 years and have caused 14 million hectares of arable land to be polluted. It has received persistent attention due to its persistence and bioaccumulation in the environment, with long-term adverse effects on ecosystems and human health.

At present, the treatment technologies of organochlorine pesticide wastewater include chemical oxidation, photocatalytic oxidation, wet oxidation, micro-electrolysis, supercritical water oxidation, ultrasonic technology, electrode biofilm technology, aerobic biological treatment, anaerobic biological treatment , Biochemical treatment of high-efficiency degrading bacteria, enzymatic degradation, etc. There are various treatment technologies for pesticide wastewater, but there are disadvantages such as high treatment cost, secondary pollution, and immature technology. In the face of large-scale organochlorine pesticide pollution, people have been seeking effective treatment methods for it. Constructed wetlands have the advantages of adapting to local conditions, low price, high efficiency, and the treatment of low-concentration pesticide wastewater. One of the measures to remove pesticide residues in agricultural runoff. The device in the present invention is a circulating water-inflow artificial wetland simulation device with gravel and soil as the substrate and calamus as the vegetation.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a circulating water inlet artificial wetland sewage treatment simulation device.

The present invention is realized as follows: a circulating water inlet artificial wetland sewage treatment simulation device, including a water distribution bucket and a constructed wetland device; a water pump is installed at the bottom of the water distribution bucket, and the top of the water pump is provided with a quick connector for a pointed mouth and a quick connector for a pointed mouth. Connect one end of the A micro-spray capillary, and the other end of the A micro-spray capillary is equipped with a drip irrigation nozzle with adjustable flow rate, and the drip irrigation sprinkler head leads into the water tank; the constructed wetland device is a galvanized iron cylinder with a diameter of 500mm and a height of 750mm. As the main body, it is divided into upper and lower layers, the middle is separated by a bottom plate, and the lower layer is a cushion layer with a thickness of 150mm, so that the water outlet pipe can be installed in the lower layer for water discharge; the upper layer contains the water inlet tank, perforated pipe, packing area and calamus; There are two kinds of fillers, namely the upper layer filler and the lower layer filler. The particle size of the lower layer filler is larger than that of the upper layer filler to prevent the blockage of the perforated pipe, and the upper layer of filler is planted with calamus; the diameter of the perforated pipe is 30mm and is set in the center of the galvanized iron cylinder. The upper 100mm of the bottom plate is perforated, the perforation diameter is 6-7mm, the holes are evenly distributed, and several layers of screen mesh are wrapped around the perforation outside the perforated pipe to prevent the perforated pipe from being blocked; Install a 90-degree elbow at the lower end, and then connect the 90-degree elbow to the outlet pipe for water outlet, set a valve on the outlet pipe, and set a reserved port on the side of the galvanized iron cylinder near the outlet pipe to adjust the valve and the outlet pipe. The end is provided with a B-tip nozzle quick connector, which is connected to one end of the B micro-spray capillary, and the other end of the B-micro-spray capillary is equipped with a B drip irrigation nozzle with adjustable flow rate, and the B drip irrigation nozzle is passed into the water distribution bucket; in the galvanized iron The upper end of the leather cylinder is arranged with a water inlet tank with a length x width of 500 x 30 x 50mm, and the triangular weir overflow method is adopted to make the water distribution uniform. The upper end of the perforated pipe is welded to the bottom of the inlet tank to fix the perforated pipe; Weld the I-shaped steel bracket inside the cushion layer to support the bottom of the constructed wetland device and prevent the constructed wetland device from being damaged due to excessive filling.

By adjusting the flow size of the drip irrigation nozzle A and the drip irrigation nozzle B to achieve the same amount of water in and out, so as to achieve circulating water;

The water distribution bucket is a 50L plastic drum;

The water outlet pipe is a polyvinyl chloride plastic pipe;

The calamus with good growth and a height of 1.3-1.5m is selected, and a total of 4-8 plants are planted;

The upper layer filler is soil, and the lower layer filler is gravel with an average particle size of 20mm;

The 20μg/L concentration of organochlorine pesticide β-HCH polluted water body to be treated was treated with a circulating water inflow constructed wetland sewage treatment simulation device, and three different hydraulic loads of 300mm/d, 600mm/d and 900mm/d were set. The removal effect of the constructed wetland on the organochlorine pesticide β-HCH under different hydraulic loads was studied. The effluent samples were collected from the outlet when the hydraulic retention time was 1, 3, 5, 7, and 9 days after the effluent was stabilized. Gas chromatography-mass spectrometry was used. The concentration of β-HCH in it was detected by the instrument. The test ran to the ninth day. The removal rate of the circulatory inflow constructed wetland sewage treatment simulation device with influent hydraulic load of 300mm/d, 600mm/d and 900mm/d was 85.5% respectively. , 86.5%, 89.8%, the three kinds of hydraulic loads have obvious removal effect on the organochlorine pesticide β-HCH.

The device of the invention is simple in structure and low in cost, the selected galvanized iron sheet is durable and light in weight, and adopts a circulating water inflow method, thereby increasing the hydraulic retention time and improving the removal rate of organochlorine pesticides. The device has good effect on the treatment of polluted water with low concentration of organochlorine pesticide β-HCH.

Description of drawings

FIG. 1 is a top view of a simulated device for circulatory inflow constructed wetland sewage treatment according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the A-A plane of the circulating water inlet constructed wetland sewage treatment simulation device in the embodiment of the present invention.

FIG. 3 is a cross-sectional view of the B-B plane of the circulatory inflow constructed wetland sewage treatment simulation device in the embodiment of the present invention.

4 is a diagram showing the treatment effect of the circulatory inflow constructed wetland sewage treatment simulation device in the embodiment of the present invention under three hydraulic loads and five residence times on the water body polluted by organochlorine pesticide β-HCH (20 μg/L).

Markings in the figure: A, B-section mark; 1-dispensing bucket; 2-water pump; 3-A tip quick connector; 4-A micro-spray capillary; 5-A drip irrigation nozzle; 6-water inlet; 7-perforated pipe ; 8- bottom plate; 9- packing area; 10- calamus; 11- 90 degree elbow; 12- outlet pipe; 13- valve; 14- I-beam bracket; 15- pad layer; 16- reserved port; Wetland device; 18-B tip quick connector; 19-B micro-spray capillary; 20-B drip irrigation nozzle.

Detailed ways

Example:

As shown in Fig. 1, Fig. 2 and Fig. 3, a circulating water-inflow constructed wetland sewage treatment simulation device includes a water distribution bucket 1 and a constructed wetland device 17; A quick connector 3, a tip quick connector 3 is connected to one end of the A micro-spray capillary 4, the other end of the A micro-spray capillary 4 is installed with a drip irrigation nozzle 5 that can adjust the flow rate, and the drip irrigation nozzle 5 is passed into the water tank 6; artificial; The wetland device 17 is mainly composed of a galvanized iron cylinder with a diameter of 500mm and a height of 750mm, which is divided into upper and lower layers, a bottom plate 8 is arranged in the middle, and the lower layer is a cushion layer 15 with a thickness of 150mm, so as to install the water outlet pipe 12 in the lower layer for Water outlet; the upper layer contains water inlet tank 6, perforated pipe 7, packing area 9 and calamus 10; the packing area 9 contains two kinds of fillers, namely upper layer filler and lower layer filler, and the particle size of the lower layer filler is larger than that of the upper layer filler to prevent the perforated pipe 7 from being blocked, The calamus 10 is planted on the upper layer filler; the perforated pipe 7 is 30mm in diameter and is arranged in the center of the galvanized iron cylinder, the perforated pipe 7 is perforated at the upper 100mm of the bottom plate 8, the perforation diameter is 6mm, the holes are evenly distributed, and outside the perforated pipe 7 The perforation is wrapped with several layers of screen mesh to prevent the perforated pipe 7 from being blocked; the perforated pipe 7 passes through the bottom plate 8 for 80 cm, and a 90-degree elbow 11 is installed at the lower end of the perforated pipe 7, and the 90-degree elbow 11 is connected to the outlet pipe 12 to carry out water outlet, a valve 13 is set on the water outlet pipe 12, a reserved port 16 is set on the side of the galvanized iron cylinder close to the water outlet pipe 12, so as to adjust the valve 13, the end of the water outlet pipe 12 is provided with a B-tip quick joint 18, B-tip quick joint 18 is connected to one end of B micro-spray capillary 19, and the other end of B-micro-spray capillary 19 is equipped with B-drip irrigation nozzle 20 with adjustable flow rate, B-drip irrigation nozzle 20 is passed into water distribution bucket 1; A water inlet trough 6 with a length x width x height of 500 x 30 x 50mm is arranged on the upper end of the cylinder, and the triangular weir overflow method is adopted to make the water distribution uniform. 7; Weld the I-shaped steel bracket 14 inside the cushion layer 15 to support the bottom of the constructed wetland device 17 and prevent the constructed wetland device 17 from being damaged due to excessive filling.

By adjusting the flow size of the drip irrigation nozzle 5 and the drip irrigation nozzle B 20, the same amount of water in and out is realized, thereby realizing the circulating water;

The described water distribution bucket 1 is a 50L plastic drum;

The water outlet pipe 12 is a polyvinyl chloride plastic pipe;

The upper layer filler is soil, and the lower layer filler is gravel with an average particle size of 20mm;

The calamus 10 planted in this example is a calamus purchased at a flower base, and the calamus with good growth is mainly selected. The calamus is about 1.4m high, and is transplanted into the constructed wetland device 17, and then a nutrient solution is prepared for cultivation, so that the calamus can adapt to the new growth environment After two or three weeks, when the calamus grows new roots, it is then discharged into the organochlorine pesticide β-HCH-contaminated water body. The transported water enters the water inlet tank 6 of the constructed wetland device 17 , and then slowly overflows into the filling area 9 . The concentration of the organochlorine pesticide β-HCH in the polluted water body is greatly reduced in the constructed wetland device 17 after adsorption and precipitation in the packing area 9 and the retention and absorption of the calamus 10 . After being processed by the packing area 9, the clean water flows out from the perforated pipe 7, and is discharged through the water outlet pipe 12, and finally flows into the water distribution bucket 1 through the B micro-spray capillary 19, so as to realize continuous operation.

The 20μg/L concentration of organochlorine pesticide β-HCH polluted water to be treated is treated by the circulating water inflow constructed wetland sewage treatment simulation device in this example, and three different settings of 300mm/d, 600mm/d and 900mm/d are used. The removal effect of the constructed wetland on the organochlorine pesticide β-HCH under different hydraulic loads was studied. The effluent samples were collected from the outlet when the hydraulic retention time was 1, 3, 5, 7, and 9 days after the effluent was stabilized. The β-HCH concentration was detected by chromatography-mass spectrometry. The specific removal effect is shown in Figure 4. It can be seen from the figure that the test runs to the ninth day, and the influent hydraulic load is 300mm/d, 600mm/d and 900mm/d. The removal rates of the simulated sewage treatment device of the circulating inflow constructed wetland are 85.5%, 86.5%, and 89.8%, respectively. The three hydraulic loads have obvious removal effects on the organochlorine pesticide β-HCH.

The above are only preferred embodiments of the present invention, and do not limit the present invention in any form. Any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention still belong to the present invention. The scope of protection of technical solutions.

Claims (1)

1. A circulating inflow artificial wetland sewage treatment simulation device is characterized by comprising a water distribution barrel (1) and an artificial wetland device (17); the bottom of the water distribution barrel (1) is provided with a water pump (2), the top of the water pump (2) is provided with a first sharp-nose quick connector (3), the first sharp-nose quick connector (3) is connected with one end of a first micro-spray capillary tube (4), the other end of the first micro-spray capillary tube (4) is provided with a first drip irrigation nozzle (5) capable of adjusting the flow, and the first drip irrigation nozzle (5) is introduced into a water inlet groove (6); the artificial wetland device (17) takes a galvanized iron sheet cylinder with the diameter of 500mm and the height of 750mm as a main body and is divided into an upper layer and a lower layer, a bottom plate (8) is arranged in the middle for separation, and the lower layer is a higher padding layer (15) with the thickness of 150mm so as to install a water outlet pipe (12) in the lower layer for water outlet; the upper layer comprises a water inlet groove (6), a perforated pipe (7), a filling area (9) and a calamus (10); the filling area (9) comprises two kinds of filling materials, namely an upper layer filling material and a lower layer filling material, the grain diameter of the lower layer filling material is larger than that of the upper layer filling material so as to prevent the perforated pipe (7) from being blocked, and calamus (10) is planted on the upper layer filling material; the diameter of the perforated pipe (7) is 30mm, the perforated pipe (7) is arranged at the center of the galvanized iron sheet cylinder, the perforated pipe (7) is perforated at the position 100mm above the bottom plate (8), the aperture of the perforated pipe is 6-7 mm, holes are uniformly distributed, and a plurality of layers of screen meshes are wrapped at the outer perforated position of the perforated pipe (7) to prevent the perforated pipe (7) from being blocked; the perforated pipe (7) penetrates through the bottom plate (8) eighty centimeters, a 90-degree elbow (11) is installed at the tail end of the lower portion of the perforated pipe (7), the 90-degree elbow (11) is connected with a water outlet pipe (12) for water outlet, a valve (13) is arranged on the water outlet pipe (12), a reserved opening (16) is formed in one side, close to the water outlet pipe (12), of the galvanized iron sheet cylinder so as to adjust the valve (13), a second-pointed-nozzle quick connector (18) is arranged at the tail end of the water outlet pipe (12), the second-pointed-nozzle quick connector (18) is connected with one end of a second-micro spray capillary (19), a second-drip spray nozzle (20) capable of adjusting the flow is installed at the other end of the second-micro spray capillary (19), and the second-drip nozzle (20; arranging a water inlet tank (6) with the length multiplied by the width multiplied by the height multiplied by 500 multiplied by 30 multiplied by 50mm at the upper end of the galvanized iron sheet cylinder, adopting a triangular weir overflow mode to enable the water distribution to be uniform, and welding the upper end of the perforated pipe (7) at the bottom of the water inlet tank (6) so as to fix the perforated pipe (7); i-shaped steel brackets (14) are welded in the padding layer (15) to support the bottom of the artificial wetland device (17) and prevent the artificial wetland device (17) from being damaged due to over-heavy filler;

the consistency of water inlet and outlet amounts is realized by adjusting the flow rates of the first drip irrigation nozzle (5) and the second drip irrigation nozzle (20), so that the circulating water inlet is realized;

the water distribution barrel (1) is a 50L plastic barrel;

the water outlet pipe (12) is a polyvinyl chloride plastic pipe;

the calamus (10) is selected from calamus with good growth vigor and height of 1.3-1.5 m, and 4-8 plants are planted in total;

the upper layer of filler is soil, and the lower layer of filler is gravel with the average grain diameter of 20 mm;

a circulating inflow constructed wetland sewage treatment simulation device is utilized to treat the organochlorine pesticide beta-HCH polluted water body with the concentration of 20 mug/L to be treated, three different hydraulic loads of 300mm/d, 600mm/d and 900mm/d are set, the removal effect of the organochlorine pesticide beta-HCH by the constructed wetland under different hydraulic loads is researched, the hydraulic retention time after the effluent collected from a water outlet is stable is 1, 3, 5 and 7, and detecting the concentration of the beta-HCH in the effluent water sample at 9 days by using a gas chromatography-mass spectrometer, wherein the removal rates of the circulating type influent artificial wetland sewage treatment simulation devices with influent hydraulic loads of 300mm/d, 600mm/d and 900mm/d are 85.5%, 86.5% and 89.8% respectively by the ninth day after the test is run, and the effluent water sample has obvious removal effects on the organochlorine pesticide beta-HCH under three hydraulic loads.

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