CN106830336A - A kind of circulating water inlet wastewater treatment analogue means - Google Patents

Abstract

The invention discloses a circulating water-inflow artificial wetland sewage treatment simulation device. The device includes a water distribution bucket and an artificial wetland device. The artificial wetland device is mainly composed of a galvanized iron cylinder, which consists of upper and lower layers, separated by a bottom plate in the middle. The upper level includes the water intake, fill area and calamus. The lower layer is the cushion layer. A perforated tube is arranged in the center of the device. The upper end of the perforated pipe is connected to the water tank, and the lower end passes through the bottom plate to reserve 80mm, and then connects the water pipe through a 90-degree elbow. In order to distribute water evenly, the water inlet tank adopts the triangular weir overflow method. The filling in the filling area includes two layers of filling, the upper layer of filling and the lower layer of filling, and calamus is planted on the filling area. The device of the invention has simple structure and low cost, and the selected galvanized iron sheet is durable and light in weight, and has a good treatment effect on water polluted by the low-concentration organochlorine pesticide β‑HCH.

Description

A Circulation Influent Constructed Wetland Sewage Treatment Simulation Device

technical field

The invention belongs to the field of treatment of polluted water bodies, 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 environmental priority pollutants, and they are also typical persistent organic pollutants. It is difficult to degrade, semi-volatile, bioaccumulative and highly toxic. It can exist in nature for a long time, and enrichment through the food chain is extremely harmful to human health and the environment. The persistence and semi-volatility of these substances also allows for long-distance transport through the atmosphere and water. Isomers of dichlorodiphenyltrichloroethane (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 a highly carcinogenic foreign substance that increases the risk of human liver, pancreas and breast cancer. Among the four isomers of HCHs (HCHs, including α-HCH, β-HCH, γ-HCH and δ-HCH), α-HCH has been found to cause human nervous system diseases, gastrointestinal discomfort and liver damage; while β-HCH has been proved to be the most stable and the most persistent 666 isomer among the four isomers in the natural environment, and has bioaccumulation and chronic toxicity. s consequence. Organochlorine pesticides have historically been used extensively as agricultural insecticides. 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. Persistence is of concern due to its persistence and bioaccumulation in the environment, and its long-term adverse effects on ecosystems and human health.

At present, the treatment technologies of organochlorine pesticide wastewater include chemical oxidation method, photocatalytic oxidation method, wet oxidation method, micro-electrolysis method, supercritical water oxidation technology, ultrasonic technology, electrode biochemical membrane technology, aerobic biological treatment, anaerobic biological treatment , biochemical treatment with highly efficient degrading bacteria, enzymatic degradation, etc. There are many kinds of pesticide wastewater treatment technologies, 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 measures to local conditions, low price, high efficiency, and being used for the treatment of low-concentration pesticide wastewater. They are considered to be an effective method. One of the measures to effectively remove residual pesticides in agricultural runoff. The device in the present invention is a circulation-type water-inflow artificial wetland simulation device with gravel and soil as substrates and calamus as vegetation.

Contents of the invention

The object of the present invention is to provide a circulating water-influent artificial wetland sewage treatment simulation device.

The present invention is achieved in the following way: a circulating water-inflow constructed 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 a sharp mouth quick connector is arranged on the top of the water pump, and a sharp mouth quick connector Connect one end of the A micro-spray capillary, the other end of the A micro-spray capillary is installed with a drip irrigation nozzle with adjustable flow rate, and the A drip irrigation nozzle passes into the water tank; the artificial 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, separated by a bottom plate in the middle, 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 outlet; the upper layer includes the water inlet tank, perforated pipe, filling area and calamus; the filling area includes two Two types of fillers, that is, 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, in order to prevent the perforated tube from being blocked, and calamus is planted on the upper layer of filler; The upper 100mm of the bottom plate is perforated, the perforation aperture is 6~7mm, the holes are evenly distributed, and several layers of screens are wrapped around the perforated tube to prevent the perforated tube from being blocked; the perforated tube passes through the bottom for 80 cm, and the A 90-degree elbow is installed at the end of the lower part, and the 90-degree elbow is connected to the outlet pipe for water outlet. A valve is set on the outlet pipe, and a reserved opening is set on the side of the galvanized iron cylinder close to the outlet pipe to adjust the valve. The end is provided with a quick connector of the tip nozzle, which is connected to one end of the capillary tube of the micro-spray tube. The other end of the capillary tube of the micro-spray tube is installed with a drip irrigation nozzle with an adjustable flow rate, and the drip irrigation nozzle is connected to the water distribution bucket; A water inlet tank with a length × width × height of 500 × 30 × 50mm is arranged on the upper end of the leather cylinder, and a triangular weir overflow method is adopted to distribute water evenly. The upper end of the perforated pipe is welded to the bottom of the water inlet tank to fix the perforated pipe; I-shaped steel brackets are welded inside the base layer to support the bottom of the constructed wetland device and prevent damage to the constructed wetland device caused by excessive filler.

By adjusting the flow rate of the A drip irrigation nozzle and the B drip irrigation nozzle, the consistent inflow and outflow of water can be achieved, thereby realizing the circulation of water inflow.

Described distribution bucket is the plastic cylinder of 50L.

The outlet pipe is a polyvinyl chloride plastic pipe.

Described calamus chooses the calamus with good growth and a height of 1.3-1.5m, and plants 4-8 strains in total.

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

The device of the invention has simple structure and low cost, and the selected galvanized iron sheet is durable and light in weight, and adopts a circular water inlet mode, thereby increasing the hydraulic retention time and helping to improve the removal rate of organochlorine pesticides. The device has a good treatment effect on water polluted by the organochlorine pesticide β-HCH at a low concentration.

Description of drawings

Fig. 1 is a top view of a simulated device for sewage treatment in a circulating influent constructed wetland in an embodiment of the present invention.

Fig. 2 is a sectional view of A-A plane of the simulated device for sewage treatment in a circulating-influent constructed wetland in an embodiment of the present invention.

Fig. 3 is a cross-sectional view of B-B plane of the simulated device for sewage treatment in a circulating-influent constructed wetland in an embodiment of the present invention.

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

Marks in the figure: A, B-section marks; 1-water distribution bucket; 2-water pump; 3-A sharp nozzle quick connector; 4-A micro-spray capillary; 5-A drip irrigation nozzle; 6-Inlet tank; 7-Perforated pipe ;8-base plate; 9-filling area; 10-calamus; 11-90 degree elbow; 12-outlet pipe; 13-valve; 14-I-shaped steel bracket; Wetland device; 18-B nozzle quick connector; 19-B micro-spray capillary; 20-B drip irrigation nozzle.

detailed description

Example:

As shown in Fig. 1, Fig. 2 and Fig. 3, a simulated device for circulating water-inflow constructed wetland sewage treatment, including a water distribution bucket 1 and a constructed wetland device 17; a water pump 2 is installed at the bottom of the water distribution bucket 1, and a sharp nozzle is arranged on the top of the water pump 2 Quick connector 3, first sharp nozzle quick connector 3 connects an end of first micro-spray capillary 4, the other end of first micro-spray capillary 4 installs the first drip irrigation nozzle 5 of adjustable flow size, and first drip irrigation nozzle 5 passes in the water inlet tank 6; Artificial The wetland device 17 is mainly composed of a galvanized iron sheet cylinder with a diameter of 500mm and a height of 750mm. Outlet water; the upper layer contains water inlet tank 6, perforated pipe 7, packing area 9 and calamus 10; packing area 9 contains two kinds of packing, namely the upper layer packing and the lower layer packing, the particle size of the lower layer packing is larger than that of the upper layer packing, so as to prevent the perforated pipe 7 from clogging, Iris 10 is planted on the upper packing; the perforated pipe 7 has a diameter of 30 mm and is arranged at the center of the galvanized iron cylinder. The perforation is wrapped with several layers of screens to prevent the perforated pipe 7 from being blocked; the perforated pipe 7 passes through the bottom 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 discharge, set a valve 13 on the water outlet pipe 12, set a reserved port 16 on the side of the galvanized iron sheet cylinder close to the water outlet pipe 12, so as to adjust the valve 13, and set a sharp mouth quick connector 18 at the end of the water outlet pipe 12, The second tip quick connector 18 connects one end of the second micro-spray capillary 19, and the other end of the second micro-spray capillary 19 is installed with a second drip irrigation nozzle 20 with adjustable flow rate, and the second drip irrigation nozzle 20 is passed into the water distribution bucket 1; A water inlet tank 6 with a length × width × height of 500×30×50mm is arranged on the upper end of the cylinder, and a triangular weir overflow method is adopted to distribute water evenly. The upper end of the perforated pipe 7 is welded to the bottom of the water inlet tank 6 to fix the perforated pipe 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 filler.

By adjusting the flow rate of the A drip irrigation nozzle 5 and the B drip irrigation nozzle 20, the consistent inflow and outflow of water can be achieved, thereby realizing the circulation of water inflow.

Described distribution bucket 1 is the plastic cylinder of 50L.

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

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

The calamus 10 planted in this embodiment is the calamus purchased at the flower base. The calamus with good growth is mainly selected. The calamus is about 1.4m in height. It is transplanted into the artificial wetland device 17, and then the nutrient solution is prepared for cultivation, so that the calamus can adapt to the new growth environment. , two or three weeks later, after calamus grows new roots, it is discharged into the organochlorine pesticide β-HCH polluted water body. The transmission of 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 after the adsorption and precipitation of the filling area 9 and the interception and absorption of the calamus 10 in the constructed wetland device 17 . After being treated in the filling 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 second micro-spray capillary pipe 19 to realize continuous operation.

Utilize the simulated device for sewage treatment in the circulating constructed wetland in this example to treat the untreated organochlorine pesticide β-HCH polluted water with a concentration of 20 μg/L, and set three different hydraulic loads (300 mm/d, 600 mm/d, mm/d, 900 mm/d), to study the removal effect of constructed wetlands on organochlorine pesticide β-HCH under different hydraulic loads, when the water collected from the outlet 12 stabilized and the hydraulic retention time was 1, 3, 5, 7, and 9 days The concentration of β-HCH in the effluent water sample was detected by gas chromatography-mass spectrometry. /d, and 900 mm/d, the removal rates of the circulation-influent constructed wetland sewage treatment simulation device of this embodiment are 85.5%, 86.5%, and 89.8%, respectively, and the organochlorine pesticide β-HCH has Visible removal effect.

The above descriptions 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 the technical solution.

Claims (1)

1. a kind of circulating water inlet wastewater treatment analogue means, it is characterised in that the circulating water inlet artificial swamp is dirty Water process analogue means includes matching somebody with somebody bucket (1) and constructed wetland device (17)；Water pump (2), water pump are installed with bucket (1) bottom (2) top is provided with first point and has a loose tongue quick coupling (3), and first point is had a loose tongue one end of the micro- spray hollow billet (4) of quick coupling (3) connection first, and first is micro- The other end of spray hollow billet (4) installs the first drip irrigation emitter (5) of regulating flow quantity size, and first drip irrigation emitter (5) is passed through intake chamber (6) It is interior；Constructed wetland device (17) is divided into upper and lower two-layer based on a diameter of 500mm, the galvanized iron sheet cylinder of a height of 750mm, Middle setting base plate (8) separates, and lower floor is the pad level (15) of thick 150mm, is carried out to install outlet pipe (12) in lower floor Water outlet；Upper strata includes intake chamber (6), perforated pipe (7), packing area (9) and calamus (10)；Packing area (9) includes two kinds of fillers, i.e., Upper strata filler and lower floor's filler, lower floor's packing material size are bigger than upper strata filler, to prevent perforated pipe (7) from blocking, are planted on the filler of upper strata Plant calamus (10)；Perforated pipe (7) a diameter of 30mm and the center of galvanized iron sheet cylinder is arranged on, perforated pipe (7) is in base plate (8) perforated at the 100mm of top, piercing aperture is 6 ~ 7mm, uniform cloth hole, and wrap up in several layers of screen windows at perforated pipe (7) outer perforation Net, to prevent perforated pipe (7) from blocking；Perforated pipe (7) is through 80 centimetres of bottom (8), and lower end in perforated pipe (7) is pacified 90 degree of elbows (11) are filled, 90 degree of elbows (11) reconnect outlet pipe (12) carries out water outlet, and valve is set on outlet pipe (12) (13) reserved opening (16), is set near this side of outlet pipe (12) in galvanized iron sheet cylinder, so as to control valve (13), water outlet The end for managing (12) sets second point and has a loose tongue quick coupling (18), and second point has a loose tongue the one of the micro- spray hollow billet (19) of quick coupling (18) connection second End, the other end of the micro- spray hollow billet (19) of second installs the second drip irrigation emitter (20) of regulating flow quantity size, and second drip irrigation emitter (20) leads to Enter to in bucket (1)；Arrange that a length × width × height is the intake chamber of 500 × 30 × 50mm in the upper end of galvanized iron sheet cylinder (6), using triangular-notch weir overflow manner, make water distribution uniform, the upper end of perforated pipe (7) is welded on the bottom of intake chamber (6), so as to solid Determine perforated pipe (7)；In pad level (15) interior welds drum steel bracket (14), to support constructed wetland device (17) bottom, prevent Only filler is overweight causes constructed wetland device (17) to damage；

It is consistent to realize turnover water with the uninterrupted of second drip irrigation emitter (20) by adjusting the first drip irrigation emitter (5), from And realize circulation water inlet；

Described is the plastic cylinder of 50L with bucket (1)；

The outlet pipe (12) is pvc tube；

The calamus (10) select growing way it is good and height 1.3 ~ 1.5m calamus, altogether plant 4 ~ 8 plants；

The upper strata filler is soil, and lower floor's filler is that average grain diameter is the gravel of 20mm.