Artificial wetlands system for purifying roof rainwater containing washing wastewater

[0021] The specific embodiments of the present invention will be described below with reference to the drawings.

[0022] Such as figure 1 As shown, a constructed wetland system for purifying roof rainwater containing laundry wastewater includes a rain and sewage diversion well 1, a grit chamber 2, a water distribution channel 3, a water distribution pipe 4, a wetland treatment area 7, a water collection pipe 5, and a flood discharge. Ditch 6. Such as Figure 5 with Image 6 As shown, the water inlet of the rain and sewage diversion well 1 is connected to the rainwater pipe 1-1 on the roof of the building, and the water outlet is respectively connected to the spillway 6 and the grit basin 2, and the rain and sewage diversion well 1 is provided with a diversion valve 1-2 and a filter 1-3 When the heavy rain flows into the rainwater pipe, the water level in the rain and sewage diversion well 1 is higher than the height of the pipe leading to the flood discharge ditch 6, the diverter valve 1-2 is opened, and the rainwater is discharged into the flood discharge ditch 6; when the laundry wastewater flows into the rainwater pipe When the water level in the rain and sewage diversion well 1 is lower than the height of the pipeline leading to the spillway 6, the diversion valve 1-2 is closed, and the laundry wastewater enters the grit chamber 2 through the rain and sewage diversion well 1 overflow weir.

[0023] Such as figure 2 As shown, the bottom of the grit tank 2 is equipped with a grit bucket, and the 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 bucket should be calculated based on the amount of grit settled within 2 days, and the amount of laundry wastewater discharged from each household per day is 0.3L. The slope of the grit bucket wall is not less than 55°, and the bottom of the grit tank has a tendency to sink. The slope of the sand bucket is not less than 0.1. The water distribution channel 3 is set at the back 1/2 section of the grit chamber 2 with a zigzag cross section. The top of the water distribution channel 3 is lower than the top of the grit tank 2, and the laundry wastewater flows from the grit tank 2 into the water distribution channel 3. The inlet end of the water distribution pipe 4 is set at the bottom of the water distribution channel 3. 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. The outlet end of the water distribution pipe 4 is provided with branch pipes, and the pipe surface is evenly distributed. Holes, so that the wastewater can be more evenly distributed on the surface of the wetland.

[0024] Such as image 3 As shown, the water distribution pipe 4 is located at a height of 0.6 m above the wetland treatment area 7, and branch pipes of the water distribution pipe 4 are evenly arranged longitudinally along the wetland treatment area 7, and laundry wastewater flows into the wetland treatment area 7 through the water distribution pipe 4 vertically. The wetland treatment zone 7 is composed of an upper matrix layer 7-1, a middle matrix layer 7-2, and a lower matrix layer 7-3. The selection of the matrix considers the gradation, and the particle size gradually decreases from bottom to top. The upper substrate layer 7-1 has a thickness of 60cm, and can be filled with soil or fine sand with a smaller particle size according to the actual treatment object. For example, the soil is more suitable for plant growth and the fine sand is less prone to blockage during wetland operation; the middle substrate layer 7 -2 The thickness is 60cm, and the filling particle size is medium according to the objects to be treated in the wetland For example, the sewage to be treated contains a higher level of ammonia nitrogen, which can be filled with more zeolite to enhance the removal effect, or the phosphorus content in the sewage is high, and steel slag, which is a phosphorus removal material, can also be filled; the lower matrix layer 7-3 Thickness of 30cm, larger filling particle size The substrates such as gravel, slag, etc., can also be filled with suitable substrate 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 appropriate plant species should be determined according to the local climatic conditions. Common wetland plants include yellow calamus, calamus, cattail, etc.

[0025] Such as image 3 with Image 6 As shown, the water collection pipe 5 is located at the bottom of the wetland treatment area 7, and the water collection pipe 5 is located at the lower substrate layer of the wetland treatment area. The water inlet end of the water collection pipe 5 is provided with branch pipes, which are evenly arranged along the longitudinal direction of the wetland treatment area 7. The surface of the pipes are evenly arranged with holes. The separated and purified laundry wastewater flows into the water collection pipe 5 from the wetland treatment area 7. Such as Figure 4 As shown, it is discharged from the spillway 6 again.

[0026] According to calculations, the area of ​​the entire combined wetland treatment area 7 is known. For example, if there are 3000 households in a community, and each household discharges 100L of laundry wastewater per day, the total area of ​​construction is 400m. 2 Vertical flow constructed wetland. The wetland treatment area 7 can also be arranged in a combined and dispersed manner. According to the scale of the wetland, pour the required size of the wetland exterior wall with concrete, with the thickness and strength meeting the requirements, and take anti-seepage measures at the bottom and side exterior walls of the wetland.