CN107162200A - A kind of artificial wet land system for purifying the roof rain water containing laundrywastes - Google Patents

Abstract

The invention discloses a kind of artificial wet land system for purifying the roof rain water containing laundrywastes, the dirty shunting well of rain, water distributor, wetland variation area, collector pipe and flood discharge ditch including being sequentially connected, flow divider is set in rain dirt shunting well, rain dirt shunting well delivery port connects flood discharge ditch and water distributor respectively, front end of the water distributor in wetland variation area, collector pipe is made up of in the rear end in wetland variation area, wetland variation area vertical filter layer.When water level is high in the dirty shunting well of heavy rain inflow rain, flow divider is opened, and rainwater is discharged into flood discharge ditch；When water level is low in the dirty shunting well of laundrywastes inflow rain, flow divider is closed, and laundrywastes enters water distributor by the dirty shunting well of rain；Laundrywastes uniformly flows into wetland variation area through water distributor, and flow-shape is horizontal drowned flow, after the vertical filter layer isolation of purified through wetland variation area, is collected by collector pipe and imports the discharge of flood discharge ditch.Laundrywastes just entrance storm sewer system or is discharged into river by appropriate processing, it is to avoid the pollution to river.

Description

A Constructed Wetland System for Purifying Roof Rainwater Containing Laundry Wastewater

technical field

The invention belongs to a sewage treatment device, in particular to an artificial wetland system for purifying roof rainwater containing laundry wastewater.

Background technique

With the advancement of urbanization, the drainage problem of building roofs has become increasingly prominent, and it is imminent to divert rain and sewage. However, in residential buildings, washing machines are often placed on balconies. Since there are no sewage pipes on the balcony, the laundry wastewater is often discharged into the rainwater pipe outside the roof, mixed with the rainwater on the roof of the building, and then directly discharged into the receiving water body. Since the laundry wastewater contains surfactants, nitrogen, phosphorus and other pollutants, it will inevitably affect the water quality in the rainwater pipes, and then pollute the water quality of the river. The application of the horizontal subsurface flow constructed wetland system to the separation and purification of building roof rainwater containing laundry wastewater has not been reported in patent literature.

As a new type of ecological sewage treatment technology, constructed wetland has been widely used in the treatment of various organic sewage (waste) water and the ecological restoration of slightly polluted water bodies due to its advantages of low investment, low operating cost, simple operation, and good treatment effect. rapid development and application. Constructed wetlands can be divided into surface flow constructed wetlands, horizontal subsurface flow constructed wetlands and vertical flow constructed wetlands. Subsurface flow wetland water seeps under the surface of the filler. On the one hand, it can make full use of the biofilm grown on the surface of the filler, the rich plant root system, surface soil and fillers. Interception and other functions can improve the treatment effect and treatment capacity; on the other hand, because the water flows under the surface, the thermal insulation is good, the treatment effect is less affected by the climate, and the sanitary conditions are better. It is currently more researched and applied in the world. A wetland treatment system.

Contents of the invention

Purpose of the invention: The present invention provides a horizontal subsurface flow artificial wetland system for separating and purifying rainwater from building roofs containing laundry wastewater, which can purify the initial rainwater entering the rainwater pipeline during the rainfall period and the laundry wastewater entering the rainwater pipeline during the non-rainfall period, and then discharge it Or enter the rainwater pipe network system together with the rainwater.

Technical solution: The constructed wetland system for purifying roof rainwater containing laundry wastewater according to the present invention includes rain and sewage diversion wells, water distribution pipes, wetland treatment areas, water collection pipes and flood discharge ditch connected in sequence. A diverter valve is set, and the water outlet of the rain-sewage diversion well is respectively connected to the flood discharge ditch and the water distribution pipe. The water distribution pipe is at the front end of the wetland treatment area, and the water collection pipe is at the rear end of the wetland treatment area. composition.

Laundry wastewater generally contains large particles of impurities. In order to avoid blocking the wetland treatment area, a grit chamber can also be set between the rainwater diversion well and the water distribution pipe. There is a grit bucket at the bottom of the grit chamber, and the large-particle impurities in the wastewater with a relative density greater than 2.65 are separated by gravity sedimentation. The laundry wastewater flows into the water distribution pipe after the preliminary sedimentation and separation of the grit chamber.

The flow of laundry wastewater is relatively large. In order to achieve the purpose of uniform water distribution, a water distribution channel can also be set between the rain and sewage diversion well and the water distribution pipe.

The flow of laundry wastewater is relatively large. In order to achieve the purpose of uniform water distribution, a water distribution channel can also be set between the rain and sewage diversion well and the water distribution pipe.

The distribution channel is set in the rear 1/2 section of the grit chamber, and the water flows through the section of the channel and falls like a distribution channel. The section of the channel connected to the grit chamber is set in a zigzag shape, and the zigzag section has a certain effect of uniform water distribution.

In order to improve the water inlet stability and water outlet stability of the wetland treatment area, the water outlet surface of the water distribution pipe (4) or the water inlet surface of the water collection pipe (5) is provided with a perforated water distribution partition, and the opening of the perforated water distribution partition The porosity is 40-60%, and the hole size is

The wetland treatment area is divided into an upper substrate layer, a middle substrate layer and a lower substrate layer. The upper substrate layer is filled with soil or fine sand. The soil is more suitable for the growth of plants and the fine sand is less likely to be blocked during wetland operation. The upper substrate layer It can retain most of the suspended solids and impurities, and the aerobic microorganisms in the matrix can also remove most of the organic matter in the water; the middle matrix layer is filled with zeolite or steel slag, and the sewage to be treated contains a relatively high level of ammonia nitrogen, so it can be filled with more Zeolite can be used to enhance the removal effect, or if the phosphorus content in sewage is high, steel slag, a phosphorus removal material, can also be considered to be filled; the lower matrix layer is filled with gravel or slag, and its anoxic state is conducive to the purification of pollutants by microorganisms, and the pollution of phosphorus The material has further adsorption effect, and also has a better water distribution effect on the effluent.

Planting wetland plants in the wetland treatment area, such as yellow iris, reed bamboo, cattail, etc., can not only rationally use the wetland treatment area to beautify the environment, but also purify the laundry wastewater by the roots of the plants.

Working principle: When the flow of heavy rain into the rainwater pipe is large and the water level in the rain-sewage diversion well is high, the diverter valve is opened and the rainwater is discharged into the flood discharge ditch; when the flow of laundry wastewater into the pipeline is small and the water level in the rain-sewage diversion well is low, the diverter valve Closed, the laundry wastewater enters the water distribution pipe through the rain and sewage diversion well; the laundry wastewater flows into the wetland treatment area evenly through the water distribution pipe, and the water flow state is a horizontal subsurface flow. After being separated and purified by the vertical filter layer in the wetland treatment area, it is collected by the water collection pipe and poured into the flood discharge ditch discharge.

Beneficial effects: 1. After proper treatment, the laundry wastewater enters the rainwater pipe network system or is discharged into the river, avoiding pollution to the river; 2. A rainwater diversion device and a grit chamber are installed at the front end of the wetland treatment area to protect the wetland treatment area from pollution. Impacted by the storm flow, it can also avoid the blockage of the wetland system due to the large amount of impurities in the influent water, and can maintain good operating conditions of the wetland; 3. The subsurface flow artificial wetland treatment system is located below the ground, which is convenient for maintenance and management. The normal function of the ground is affected, and wetland plants can also be planted on it, which has the function of beautifying the environment.

Description of drawings

Fig. 1 is the floor plan of the present invention;

Fig. 2 is a sectional view M-M of the present invention;

Fig. 3 is the sectional view N-N of the present invention;

Fig. 4 is the sectional view L-L of the present invention;

Fig. 5 is a cross-sectional schematic diagram of the principle of diversion of rainwater into the rain-sewage diversion well;

Figure 6 is a schematic cross-sectional view of the principle of diversion of laundry wastewater into the rain and sewage diversion well;

detailed description

Specific embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in Figure 1, a constructed wetland system for purifying roof rainwater containing laundry wastewater includes a rainwater diversion well 1, a grit chamber 2, a water distribution channel 3, a water distribution pipe 4, a wetland treatment area 7, and a water collection pipe connected in sequence 5 and spillway ditch 6. As shown in Figures 5 and 6, the water inlet of the rainwater and sewage diversion well 1 is connected to the building roof rainwater pipe 1-1, and the water outlet is respectively connected to the flood discharge ditch 6 and the grit chamber 2, and the rainwater and sewage diversion well 1 is provided with a diverter valve 1-2 And filter screen 1-3, when heavy rain flows into the rainwater pipe, the flow rate is relatively large, and the water level in the rain and sewage diversion well 1 is higher than the pipeline height leading to the flood discharge ditch 6, the diversion valve 1-2 is opened, and the rainwater is discharged into the flood discharge ditch 6; The flow of laundry wastewater into the rainwater pipe is small, and when the water level in the rainwater diversion well 1 is lower than the height of the pipe leading to the flood discharge ditch 6, the diverter valve 1-2 is closed, and the laundry wastewater enters the grit chamber through the overflow weir of the rainwater diversion well 1 2.

As shown in Figure 2, a grit chamber is provided at the bottom of the grit chamber 2, and large particles of impurities with a relative density greater than 2.65 in the wastewater are separated by gravity sedimentation. The volume of the grit chamber should be calculated according to the amount of grit within 2 days. The grit amount of laundry wastewater discharged by each household is 0.3L. The slope of the wall of the grit chamber should not be less than 55°. The slope of the sand bucket shall not be less than 0.1. The distribution channel 3 is arranged in the rear 1/2 section of the grit chamber 2, and the cross section of the channel is a zigzag section. The water inlet end of the water distribution pipe 4 is located at the bottom of the water distribution channel 3, and the laundry wastewater can flow into the water distribution pipe 4 through the slope (i=0.1) at the bottom of the water distribution channel 3.

As shown in Figure 3, the water distribution pipe 4 is placed at a height of 0.6m from the front end of the wetland treatment area 7 to the bottom, and an appropriate pipe diameter is selected according to the treatment water volume of the wetland system. larger diameter The matrix, such as gravel, zeolite, etc., ensures that the wastewater entering the wetland treatment area 7 can flow in evenly. A perforated water distribution partition is placed on the water outlet surface of the water distribution pipe 4 to improve the water inlet stability of the wetland treatment area 7 without affecting the water flow conditions of the wetland treatment area 7. The perforated water distribution partition has an opening ratio of 40 to 60%. size is (Depending on the wetland and pre-processed wetland tank matrix filler particle size).

The wetland treatment area 7 is composed of an upper substrate layer 7-1, a middle substrate layer 7-2, and a lower substrate layer 7-3. The selection of substrates considers gradation, and the particle size gradually decreases from bottom to top. The upper matrix layer 7-1 has a thickness of 30cm, and can be filled with soil or fine sand with less particle size according to the actual treatment object, for example, the soil is more suitable for the growth of plants and the fine sand is less prone to blockage during wetland operation; the middle layer matrix Layer 7-2 has a thickness of 30cm, and the filling particle size is medium according to the object to be treated in the wetland For example, if the sewage to be treated contains a high level of ammonia nitrogen, more zeolite can be filled to enhance the removal effect, or if the phosphorus content in the sewage is high, steel slag, a phosphorus removal material, can also be considered; the lower matrix layer 7-3 Thickness 20cm, filling particle size is larger The matrix such as gravel, slag, etc., can also be filled with suitable matrix materials according to actual needs. The plants planted in the wetland treatment area 7 can be determined according to the objects to be treated in the constructed wetland, and the plants should be selected according to the local climate conditions.

The water collection pipe 5 is located at the rear end of the wetland treatment area 7, and the water collection pipe 5 is placed at a distance of 0.3m from the wetland bottom of the combined wetland system, and the appropriate pipe diameter is selected according to the water output of the wetland system, and holes are evenly drilled on the water distribution pipe, and at the same time The filling particle size in the effluent collection area is relatively large The matrix, such as gravel, zeolite, etc., ensures that the wastewater in the wetland treatment area flows out evenly. A perforated water distribution partition is placed on the water inlet surface of the water collection pipe 5 to improve the stability of the water outlet in the wetland treatment area 7 without affecting the water flow conditions in the wetland treatment area 7. for (Depending on the wetland and pre-processed wetland tank matrix filler particle size).

As shown in FIG. 4 , after the waste water is separated and purified by the wetland treatment area 7 , it is merged into the flood discharge ditch 6 by the water collection pipe 5 and discharged.

According to the calculation, the area of the entire combined wetland system is known. For example, if there are 3,000 households in a community, and each household discharges 100L of laundry wastewater per day, it is necessary to build a horizontal subsurface flow artificial wetland with a total area of 600m ² . Wetlands can also be arranged in a combined and dispersed manner. According to the scale of the wetland, use concrete to pour the wetland outer wall of the required size, the thickness and strength meet the requirements, and take anti-seepage measures on the bottom and side outer walls of the wetland.

Claims (8)

1. A constructed wetland system for purifying roof rainwater containing laundry wastewater, characterized in that it comprises sequentially connected rain-sewage diversion wells (1), water distribution pipes (4), wetland treatment areas (7), and water collection pipes (5) and a flood discharge ditch (6), a diverter valve (1-2) is arranged in the rain-sewage diversion well (1), and the outlet of the rain-sewage diversion well (1) is respectively connected to the flood discharge ditch (6) and the water distribution pipe (4), The water distribution pipe (4) is at the front end of the wetland treatment area (7), the water collection pipe (5) is at the rear end of the wetland treatment area (7), and the wetland treatment area (7) is composed of vertical filter layers. 2. A constructed wetland system for purifying roof rainwater containing laundry wastewater according to claim 1, characterized in that a grit chamber (2) is set between the rain-sewage diversion well (1) and the water distribution pipe (4) . 3. A constructed wetland system for purifying roof rainwater containing laundry wastewater according to claim 1, characterized in that a water distribution channel (3) is provided between the rain-sewage diversion well (1) and the water distribution pipe (4). 4. The constructed wetland system for purifying roof rainwater containing laundry wastewater according to claim 1, characterized in that grit chambers (2) are sequentially arranged between the rain-sewage diversion well (1) and the water distribution pipe (4) ) and distribution channel (3). 5 . The constructed wetland system for purifying roof rainwater containing laundry wastewater according to claim 4 , wherein the section of the distribution channel is a zigzag section. 6 . 6. A kind of artificial wetland system for purifying roof rainwater containing laundry wastewater according to claim 1, characterized in that, the water outlet surface of the water distribution pipe (4) or the water inlet surface of the water collection pipe (5) are provided with perforated water distribution Partition board, the opening ratio of the perforated water distribution partition board is 40% to 60%, and the hole size is 7. A kind of artificial wetland system for purifying roof rainwater containing laundry wastewater according to claim 1, characterized in that, the wetland treatment area (7) is divided into an upper substrate layer (7-1) filled with soil or fine sand ), a middle matrix layer (7-2) filled with zeolite or steel slag, and a lower matrix layer (7-3) filled with gravel or slag. 8 . The constructed wetland system for purifying roof rainwater containing laundry wastewater according to claim 7 , characterized in that, the wetland treatment area ( 7 ) is planted with iris, reed bamboo or cattail.