Abstract: A stormwater runoff treatment substrate includes a lower pyrite substrate layer and an upper biochar substrate layer. The lower pyrite substrate layer includes pyrite, oyster shell powder, and sandy materials in a volume ratio of 10:5:85. The upper biochar substrate layer includes biochar or activated carbon, organic nutrient soil, and sandy materials in a volume ratio of 20:3:77.

Abstract: A stormwater runoff treatment substrate includes a lower pyrite substrate layer and an upper biochar substrate layer. The lower pyrite substrate layer includes pyrite, oyster shell powder, and sandy materials in a volume ratio of 10:5:85. The upper biochar substrate layer includes biochar or activated carbon, organic nutrient soil, and sandy materials in a volume ratio of 20:3:77.

Abstract: A bioretention pond includes a pond body and an overflow weir. The pond body includes a pond wall and a layered substrate. The layered substrate includes from bottom to top: a gravel layer, a transition layer, a pyrite layer, a plant layer, a pebble water layer, an organic layer, and a water storage layer. The overflow weir is disposed on the pebble water layer with a space left above the center of the pebble layer. The organic layer is disposed in the space and covers the pebble layer. The water storage layer is disposed onto the organic layer. The pond body further includes a perforated pipe disposed in the gravel layer; and the perforated pipe includes an outlet end disposed at the top part of the pyrite layer.

Abstract: A flow splitter including a first plate being immobile and a second plate being turnable with respect to the first plate. The first plate includes a central part, and the central part includes a slot and two side parts disposed at two ends of the slot, respectively. The second plate includes a first subplate and a second subplate, and the first subplate includes one end provided with a flange. The second plate is coupled to the first plate. The first subplate and the second subplate are disposed at two side of the slot; two sides of the second plate include two gaps, respectively. The two side parts of the first plate are disposed in the two yaps, respectively.

Abstract: A stormwater runoff treatment substrate includes a lower pyrite substrate layer and an upper biochar substrate layer. The lower pyrite substrate layer includes pyrite, oyster shell powder, and sandy materials in a volume ratio of 10:5:85. The upper biochar substrate layer includes biochar or activated carbon, organic nutrient soil, and sandy materials in a volume ratio of 20:3:77.

Abstract: A flow splitter including a first plate being immobile and a second plate being turnable with respect to the first plate. The first plate includes a central part, and the central part includes a slot and two side parts disposed at two ends of the slot, respectively. The second plate includes a first subplate and a second subplate, and the first subplate includes one end provided with a flange. The second plate is coupled to the first plate. The first subplate and the second subplate are disposed at two side of the slot; two sides of the second plate include two gaps. respectively. The two side parts of the first plate are disposed in the two yaps, respectively.

Abstract: A device for vehicle hindrance and rainwater treatment including a vehicle hindrance body and a well pit. The vehicle hindrance body includes a lower sidewall, the well pit includes a top opening, and the lower sidewall encloses the top opening. The lower sidewall includes a plurality of water inlet holes. The well pit includes an upper part, a lower part, and a partition disposed between the upper part and the lower part. The partition includes a plurality of leaking holes. The upper part of the well pit includes an outer ring belt filled with a rainwater pretreatment filler, a center ring belt filled with soil, and a rainwater collection ring belt disposed between the outer ring belt and the inner ring belt. The lower part includes a water-sand separating folded plate, a water-sand discharging channel, a rainwater collecting tank, and a rainwater storage chamber.

Abstract: A device for vehicle hindrance and rainwater treatment including a vehicle hindrance body and a well pit. The vehicle hindrance body includes a lower sidewall, the well pit includes a top opening, and the lower sidewall encloses the top opening. The lower sidewall includes a plurality of water inlet holes. The well pit includes an upper part, a lower part, and a partition disposed between the upper part and the lower part. The partition includes a plurality of leaking holes. The upper part of the well pit includes an outer ring belt filled with a rainwater pretreatment filler, a center ring belt filled with soil, and a rainwater collection ring belt disposed between the outer ring belt and the inner ring belt. The lower part includes a water-sand separating folded plate, a water-sand discharging channel, a rainwater collecting tank, and a rainwater storage chamber.

Abstract: A system for treating and recycling rainwater, including at least three stages constructed wetlands disposed along a sloped surface. Each stage constructed wetland includes a coarse gravel layer, a fine gravel layer, an improved soil layer, and wetland plants from bottom to top. Slopes are disposed at two sides of the upper part of each constructed wetland and are different in heights. An intermediate overflow pipe is disposed at the top of the slope between every two adjacent constructed wetlands. A last overflow pipe communicates with a municipal rainwater pipe. The coarse gravel layers of every two adjacent constructed wetlands are connected by connecting pipes. A perforated water collecting pipe is disposed at front ends of the connecting pipes. A water outlet pipe is disposed in the bottom of the coarse gravel layer of a last stage constructed wetland and is connected to a clean water reservoir.

Abstract: A system for reducing emission of nitrous oxide during sewage treatment, including: a regulating pool, a first aerobic constructed wetland, an anoxic pool, and a second aerobic constructed wetland. The water outlet of the regulating pool is connected to the water inlet of the top of the first aerobic constructed wetland via a pipe and a first control valve. The first aerobic constructed wetland includes sequencing batch constructed wetlands arranged in parallel. A branch pipe and a second control valve are disposed on the pipe between the regulating pool and the first aerobic constructed wetland. The outlet of the branch pipe and the water outlet of the first aerobic constructed wetland are combined together and connected to the water inlet of the bottom part of the anoxic pool. The anoxic pool is an upward flow biological filter.

Abstract: A system for harvesting rainwater for use in a skirt building. The skirt building includes a main building and a podium supporting the main building. The system includes: a standpipe; a buffer channel; a filter channel; and a green roof. The green roof includes a vegetation region including a baffled diversion corridor, and a bottom filtering layer including a drainage pipe. The standpipe is arranged on the main building and is connected to the buffer channel where the energy of rainwater flowing out of the standpipe is dissipated. The buffer channel, the filter channel, and the green roof are arranged on the podium, and the buffer channel communicates with the filter channel. The filter channel is connected to the green roof. The filter channel is divided into a plurality of sections respectively filled with different matrix materials.

Abstract: A system for purifying rainfall runoff including a bar screen; a collection and diversion device; a filter channel; a grass ditch; and a water storage tank. The bar screen is disposed around the collection and diversion device for preliminarily filtering the road rainfall runoff. The collection and diversion device collects the road rainfall runoff and diverts early rainfall runoff to the filter channel, after the filter channel is full, later rainfall runoff is directly diverted to the grass ditch through open channels. The grass ditch includes a percolation bed capable of filtering the early and later rainfall runoff. The water storage tank is connected to the grass ditch via a guiding pipe, to receive the rainfall runoff effusing out of the grass ditch. Part of the rainfall runoff received by the water storage is transported to the percolation bed by a return conduit.

Abstract: A reactor for sewage treatment includes: an inner layer including a water distribution zone; a middle layer including a biological aerated filter, the biological aerated filter including a wall and a bottom including a water outlet; and an outer layer including an artificial wetland, the artificial wetland including a bottom including a water inlet. The water distribution zone, the biological aerated filter, and the artificial wetland are in the shape of a circle. The sewage is introduced into the water distribution zone via a water inlet pipe. The water distribution zone communicates with the biological aerated filter via a first overflow. The water outlet arranged on the bottom of the biological aerated filter is connected to the water inlet arranged on the bottom of the artificial wetland to allow the biological aerated filter to communicate with the artificial wetland.

Abstract: An integrated system for treating and recycling rainwater in a residential community. The residential community includes low-lying land. The integrated system includes a primary channel for receiving and treating initial rainwater, a baffled water treatment pool, and a reservoir. The primary channel includes an external wall and an inner wall. The baffled water treatment pool includes a water inlet which is disposed on the inner wall of the primary channel. The reservoir includes a water inlet, a gravel filter layer, and an overflow wall. The primary channel, the baffled water treatment pool, and the reservoir are disposed in the low-lying land. The primary channel is annular and surrounds the baffled water treatment pool and the reservoir. The overflow wall of the reservoir cuts off the annular primary channel. The baffled water treatment pool and the reservoir are adjacent to each other and are divided by a shared wall.

Abstract: A system for treating and recycling rainwater, including at least three stages constructed wetlands disposed along a sloped surface. Each stage constructed wetland includes a coarse gravel layer, a fine gravel layer, an improved soil layer, and wetland plants from bottom to top. Slopes are disposed at two sides of the upper part of each constructed wetland and are different in heights. An intermediate overflow pipe is disposed at the top of the slope between every two adjacent constructed wetlands. A last overflow pipe communicates with a municipal rainwater pipe. The coarse gravel layers of every two adjacent constructed wetlands are connected by connecting pipes. A perforated water collecting pipe is disposed at front ends of the connecting pipes. A water outlet pipe is disposed in the bottom of the coarse gravel layer of a last stage constructed wetland and is connected to a clean water reservoir.

Abstract: A system for treating rainwater runoff from an underlying surface, including: a rainwater collecting facility, a primary runoff treatment facility, a first biological filtration facility, a second biological filtration facility, a third biological filtration facility, and a drainage canal. A pavement open channel is connected to the water inlet of the primary runoff treatment facility. The water outlet of the primary runoff treatment facility is connected to the water inlet of the first biological filtration facility. A square pipeline is connected to the water inlet of the second biological filtration facility. The water outlet of the first biological filtration facility, the water outlet of the second biological filtration facility, and a roof drainage pipeline are connected to the water inlet of the third biological filtration facility. The third biological filtration facility is connected to the drainage canal.

Abstract: A system for reducing emission of nitrous oxide during sewage treatment, including: a regulating pool, a first aerobic constructed wetland, an anoxic pool, and a second aerobic constructed wetland. The water outlet of the regulating pool is connected to the water inlet of the top of the first aerobic constructed wetland via a pipe and a first control valve. The first aerobic constructed wetland includes sequencing batch constructed wetlands arranged in parallel. A branch pipe and a second control valve are disposed on the pipe between the regulating pool and the first aerobic constructed wetland. The outlet of the branch pipe and the water outlet of the first aerobic constructed wetland are combined together and connected to the water inlet of the bottom part of the anoxic pool. The anoxic pool is an upward flow biological filter.

Abstract: A method for roof drainage for reducing urban waterlogging, the method including: arranging a drainage device on a roof, the drainage device including a drainage exit and a drainage pipe including a wall; increasing the height of the drainage exit to allow the drainage exit to be between 5 and 10 cm higher than the roof; arranging a water outlet hole having a drainage capacity on the wall of the drainage pipe at a position that has the same height as the roof or is lower than the roof; disposing a siphon including an inlet and an outlet on an upper part of the drainage pipe, allowing the inlet to face the roof, and allowing the outlet to extend into the drainage pipe; and disposing a ball cock mechanism on the wall of the drainage wall to control the water outlet hole to open or close.

Abstract: A rainwater head, including: a dome, a drainage pipe, a siphon, and a ball cock mechanism. The drainage pipe includes a drainage exit and a wall including a water outlet hole. The ball cock mechanism includes a floating ball, a connecting bar, a fulcrum, and a stopper. The drainage pipe is connected to the lower part of the dome. The drainage exit is arranged on the top of the drainage pipe. The drainage exit is adapted to be between 5 and 10 cm higher than the roof. The water outlet hole is arranged on the wall of the drainage pipe at a position having the same height as the roof or is lower than the roof. The siphon is disposed on the upper part of the drainage pipe. The inlet of the siphon faces the roof; and the outlet of the siphon extends inside the drainage pipe.

Abstract: A reactor for sewage treatment including: an inner layer including a water distribution zone; a middle layer including a biological aerated filter, the biological aerated filer including a wall and a bottom including a water outlet; and an outer layer including an artificial wetland, the artificial wetland including a bottom including a water inlet. The water distribution zone, the biological aerated filter, and the artificial wetland are in the shape of a circle. The sewage is introduced into the water distribution zone via a water inlet pipe. The water distribution zone communicates with the biological aerated filter via a first overflow. The water outlet arranged on the bottom of the biological aerated filer is connected to the water inlet arranged on the bottom of the artificial wetland to allow the biological aerated filter to communicate with the artificial wetland.