CN107381954A - A kind of rainwater purification apparatus for building - Google Patents

Abstract

The invention relates to the technical field of sewage treatment, in particular to a rainwater purification device for buildings, which includes a water collection tray and a housing, the water collection tray is arranged on the top of the housing for collecting rainwater, and the top of the housing is also provided with An annular guide groove and a green belt soil layer, the annular guide groove surrounds the green belt soil layer, and a filter chamber, a settling chamber, a buffer chamber, a fine filter chamber and a water collection chamber are sequentially arranged in the housing from top to bottom. The rainwater purification device for buildings of the present invention has a simple structure and is convenient to use. When there is rainfall, the rainwater is collected through the water collection tray, and the rainwater is collected into the annular guide groove under the action of gravity, and then flows into the settling chamber through the connecting pipe, and is discharged in the filter chamber. Cooperate with the settling chamber to perform sedimentation filtration, then pass through the fine filter chamber for deep filtration and purification, and finally fall into the water collection chamber for collection to realize rainwater filtration and purification. important meaning.

Description

A rainwater purification device for buildings

technical field

The invention relates to the technical field of sewage treatment, in particular to a rainwater purification device for buildings.

Background technique

China is one of the 13 countries in the world that are seriously short of water. With the rapid development of the national economy, the rapid growth of population and the improvement of people's living standards, industrial and urban domestic water use has increased significantly, and water resources have become increasingly tense. Only 0.28% of the fresh water resources on the earth can be used as domestic water, agricultural water and industrial water to meet human needs. Due to the uneven distribution of water resources in time and space, coupled with the irrational development and utilization of water resources and the serious waste of human beings, as well as the aggravation of water pollution in the process of urbanization and industrialization, etc., the contradiction of water use has become more and more prominent.

Recently, people have paid more and more attention to the utilization of rainwater in natural water resources. The extensive utilization of rainwater resources is an effective measure to save water, reduce urban flood disasters, relieve the burden on drainage pipes, reduce pollution load, and improve the water environment. At present, the collection and utilization of rainwater is becoming more and more popular at home and abroad. After a certain filtration, the rainwater can be used as reclaimed water, and it can even meet the standard of drinking water. Since the water collection surface for collecting rainwater is basically open-air, various reasons will cause the rainwater to be polluted to varying degrees. The direct use of this kind of water is not safe and will also have adverse effects on the environment. Therefore, proper filtration device, it is necessary to filter the collected rainwater.

In the prior art, a rainwater filtration tower as disclosed in Chinese Patent Publication No. CN103071333A includes a tower body, a main roof drainage pipe, and a water collection pipeline. The top of the tower body is installed with a tower top pipeline extending into the interior of the tower body , and a first liquid redistributor is installed at the end of the tower top pipeline; the inner cavity of the tower body is provided with a first packing layer and a second packing layer that are sequentially laid on the packing support from top to bottom, A wire-wrapped filter is installed between the first packing layer and the second packing layer; a faucet communicating with the inner cavity of the tower body is arranged on the bottom side wall of the tower body; The pipe is connected to the drainage collection plate at the eaves of the roof; one end of the water collection pipeline is connected with the roof drainage main pipe, and the other end is connected with the tower top pipeline. The invention makes use of rainwater with good water quality to alleviate the current situation of water shortage; it does not consume electric energy, has low operating costs, and reduces people's water expenses; it solves the problem of seasonal precipitation, especially in areas with drought and little rain. However, the rainwater treatment capacity of the device is small, and the filtration efficiency is low.

Another example is a kind of osmotic rainwater filtering well opened by Chinese Patent Publication No. CN203546888U, which comprises a well cover, a well body and a base, and is a comprehensive rainwater infiltration device. There are rainwater inlet pipes and outlet pipes on the well body, and the inlet pipes should be lower than the outlet pipes; permeation holes and automatic filtering devices are set on the base, and the automatic filtering devices include sewage intercepting hanging baskets, water filter grilles, and water filter grilles Divide the well base into two regions. The base of the well is opened with a porosity rate of 1% to 2%. When the infiltration well is buried underground, gravel, geotextile and sand filter layer are filled around the opening area of the well base, and the porosity of the gravel filling is about 30%. When it rains, the rainwater enters the permeable rainwater filtration well from the water inlet pipe, and the solid impurities flowing in with the rainwater are firstly trapped on the sewage intercepting hanging basket and the water filter grid in the well, and part of the rainwater enters the gravel through the small holes in the base of the permeable well. The filter layer infiltrates into the soil, and the excess rainwater flows out from the outlet pipe to the next infiltration well. The device has a good filtering effect, but its application range is limited.

In order to solve the defects in the prior art, the present invention provides a rainwater purification device for buildings with simple structure, convenient use, good filtering effect and high filtering efficiency.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies of the prior art and provide a rainwater purification device for buildings. When there is rainfall, the rainwater collection surface area is increased through the water collecting tray to collect more rainwater, and the collected rainwater is under the action of gravity. It collects into the annular guide groove, and then flows into the sedimentation chamber through the connecting pipe, through the cooperation of the filter chamber and the sedimentation chamber for sedimentation filtration, then through the fine filter chamber for deep filtration and purification, and finally falls into the water collection chamber for collection to realize rainwater filtration Purification, its high filtration efficiency and good filtration effect are of great significance to promote the application and development of sponge cities.

The purpose of the present invention is achieved through the following technical solutions:

A rainwater purification device for buildings, comprising a water collecting pan and a housing, the water collecting pan is arranged on the top of the housing for collecting rainwater, the top of the housing is also provided with an annular guide groove and a green belt soil layer, the The annular guide groove surrounds the soil layer of the green belt, and the housing is provided with a filter room, a settling room, a buffer room, a fine filter room and a water collection room in sequence from top to bottom, and the filter room is embedded in the soil of the green belt. In the layer, a plurality of connecting pipes are evenly arranged at the bottom of the annular guide groove. The connection end is also provided with a first filter screen, and the side wall of the filter chamber is also provided with a first overflow pipe, and the filter chamber communicates with the buffer chamber through the first overflow pipe, and the buffer chamber is a cavity for Temporarily store the water filtered by the filter chamber. The two ends of the fine filter chamber are respectively connected with the buffer chamber and the water collection chamber. The fine filter chamber is filled with adsorption fillers for deep filtration of rainwater. The side of the water collection chamber The wall is also provided with a negative pressure pipe, a spray water pipe and a second overflow pipe respectively, and the second overflow pipe is arranged on the inner wall of the water collecting chamber near the fine filter chamber, and the negative pressure pipe is arranged on the second overflow pipe. Above the pipe, a vacuum pump is also arranged on the negative pressure pipe, and at least one nozzle is arranged on the top of the water collection tray, and the nozzle communicates with the spray water pipe, and a water pump is also arranged on the spray water pipe; the housing A slag discharge pipe is also provided at the bottom, and the slag discharge pipe passes through the water collection chamber, the fine filter chamber and the buffer chamber in sequence, and communicates with the bottom of the settling chamber.

Further, a second filter screen is also provided between the annular guide groove and the communicating pipe. When there is rainfall, the rainwater collection surface area is increased through the water collecting pan to collect more rainwater, and the collected rainwater is collected into the annular guide groove under the action of gravity, and then flows into the settling chamber through the connecting pipe for filtration; A second filter is set between the annular guide groove and the connecting pipe. When the rainwater flows from the annular guide groove into the connecting pipe, the second filter is used to remove large particles of impurities in the rainwater, so as to avoid the blockage of the purification device caused by large particles of impurities. .

Further, the green belt soil layer is used for planting green belt plants. Use the idle space on the top of the purification device to set it as the soil layer of the green belt for planting green belt plants, improve the urban greening rate, and avoid direct sunlight. Preferably, a root-resistance layer is provided on the outer wall of the filter chamber; the root-resistance layer is used to limit the growth of plant roots in the green belt, so as to avoid damage to the structure of the filter chamber and the purification device due to the growth of plant roots in the green belt.

Further, the bottom of the settling chamber is also provided with a slag collection cylinder, the slag collection cylinder has an inverted conical structure, and the slag discharge pipe communicates with the bottom of the slag collection cylinder. After the rainwater enters the settling chamber through the connecting pipe, after the rainwater has accumulated to a certain amount, the rainwater enters the filter chamber through the first filter screen and flows out from the first overflow pipe of the filter chamber; The fluidity in the settling chamber is small and the residence time is long, so that the impurities in the rainwater slowly settle to the bottom of the settling chamber and accumulate, and the settled rainwater flows out through the first overflow pipe set on the side wall of the filter chamber, and when the rainwater passes through When the first filter screen enters the filter chamber, it can effectively filter the impurities flowing with the water flow, and improve the settling efficiency and settling effect.

Further, a plurality of adsorption channels are evenly arranged in the adsorption packing of the fine filter chamber. After the rainwater is treated in the settling chamber and the filter chamber, it flows into the buffer chamber through the first overflow pipe and is temporarily stored in the buffer chamber. At the same time, the rainwater is further filtered and purified through the fine filter chamber. In the process of the fine filter chamber, by setting multiple adsorption channels in the adsorption packing of the fine filter chamber, a large amount of rainwater can be filtered and purified quickly through the adsorption channels, which increases the rainwater treatment capacity of the fine filter chamber per unit time and improves the efficiency of the device. Purification efficiency and purification effect.

Further, the adsorption channel is an "S"-shaped adsorption channel. The adsorption channel is set as an "S"-shaped adsorption channel, thereby prolonging the filtration stroke of rainwater and prolonging the contact time between rainwater and adsorption fillers, thereby improving the filtration and purification efficiency and effect of adsorption fillers on rainwater, and ensuring the water quality after treatment by the device Up to standard.

Further, an ultraviolet lighting unit is also provided on the inner wall of the water collection chamber for sterilizing the purified water. Preferably, the ultraviolet lighting unit is illuminated by an ultraviolet lamp with a power supply. After the rainwater is treated by the fine filter chamber, it flows into the water collection chamber for collection, and the water accumulated in the water collection chamber, under the action of the ultraviolet light unit, effectively sterilizes the water, improves the quality of the water body, and prolongs the water in the collection chamber. On the other hand, spray water pipes are set on the side wall of the water collection chamber. In the process of hot weather, when the green belt plants planted on the green belt soil layer need to be watered, the water pump is turned on. Under the action of the water pump, the water in the water collection chamber is pumped out, and flows to the nozzle through the sprinkler pipe, and sprays to the plants in the green belt through the nozzle, so as to realize the watering of the plants in the green belt and improve the utilization efficiency of water resources.

Further, the adsorption filler is activated carbon, and the bottom surface of the adsorption filler supports titanium dioxide. In the process of rainwater flowing to the water collection chamber through the adsorption filler, the cooperation between the ultraviolet light unit and the activated carbon loaded with titanium dioxide makes the activated carbon have a photocatalytic effect and can effectively adsorb and decompose the macromolecular organic matter in the flowing water. Improve the purification efficiency and purification effect of the device.

Further, an overflow valve is provided on the second overflow pipe, and a slag discharge valve is also provided on the slag discharge pipe. By setting the second overflow pipe on the side wall of the water collection chamber, when the water body in the water collection chamber needs to be utilized, the second overflow pipe is connected, the overflow valve is opened, and the water in the water collection chamber passes through the second overflow pipe outflow, so as to improve the utilization rate of water resources; and set a slag discharge valve on the slag discharge pipe, and open the slag discharge valve when the impurities in the slag collection cylinder accumulate to a certain amount, so that the impurities are discharged from the slag discharge pipe; or If the rainfall is large and exceeds the processing capacity of the device, open the slag discharge valve, so that the rainwater in the settling chamber can be discharged directly through the slag discharge pipe, reducing the workload of the device, and at the same time conduct a reasonable diversion of rainwater to avoid accumulation of rainwater. waterlogging.

The beneficial effects of the present invention are: the rainwater purification device for buildings of the present invention has a simple structure and is convenient to use. When there is rainfall, the rainwater collection surface area is increased through the water collecting tray to collect more rainwater, and the collected rainwater is under the action of gravity. It collects into the annular guide groove, and then flows into the sedimentation chamber through the connecting pipe, through the cooperation of the filter chamber and the sedimentation chamber for sedimentation filtration, then through the fine filter chamber for deep filtration and purification, and finally falls into the water collection chamber for collection to realize rainwater filtration Purification, its high filtration efficiency and good filtration effect are of great significance to promote the application and development of sponge cities.

Description of drawings

Fig. 1 is the structural representation of building rainwater purification device of the present invention;

Fig. 2 is the top view of building rainwater purification device of the present invention;

In the figure, 1-housing, 2-water collection tray, 3-ring guide groove, 4-green belt soil layer, 5-filtration chamber, 6-sedimentation chamber, 7-buffer chamber, 8-fine filter chamber, 9- Water collection chamber, 10-communicating pipe, 11-first filter screen, 12-first overflow pipe, 13-adsorption packing, 14-negative pressure pipe, 15-second overflow pipe, 16-slag discharge pipe, 17 -spray water pipe, 18-vacuum pump, 19-nozzle, 20-overflow valve, 21-slag discharge valve, 22-ultraviolet lighting unit, 23-root-blocking layer, 24-green belt plants, 25-second filter , 26-adsorption channel, 27-slag collection cylinder, 28-water pump.

detailed description

The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited to the following description.

As shown in Fig. 1 and Fig. 2, a rainwater purification device for buildings includes a water collecting pan 2 and a housing 1, the water collecting pan 2 is arranged on the top of the housing 1 for collecting rainwater, and the housing 1 The top is also provided with an annular guide groove 3 and a green belt soil layer 4, the annular guide groove 3 surrounds the green belt soil layer 4, and the housing 1 is sequentially provided with a filter chamber 5, a settling chamber 6, a buffer chamber 7, fine filter chamber 8 and water collection chamber 9, the filter chamber 5 is embedded in the green belt soil layer 4, the green belt soil layer 4 is arranged on the top of the settling chamber 6, and the bottom of the annular guide groove 3 is uniform A plurality of communication pipes 10 are provided, and the two ends of the communication pipes 10 communicate with the annular guide groove 3 and the settling chamber 6 respectively, the filter chamber 5 communicates with the settling chamber 6, and the connecting end of the filter chamber 5 and the settling chamber 6 A first filter screen 11 is also provided, and a first overflow pipe 12 is also provided on the side wall of the filter chamber 5, and the filter chamber 5 communicates with the buffer chamber 7 through the first overflow pipe 12, and the buffer chamber 7 is The cavity is used to temporarily store the water filtered by the filter chamber 5. The two ends of the fine filter chamber 8 are respectively connected with the buffer chamber 7 and the water collection chamber 9. The fine filter chamber 8 is filled with adsorption fillers 13 for The rainwater is filtered in depth, and the side walls of the water collection chamber 9 are also respectively provided with a negative pressure pipe 14, a spray water pipe 17 and a second overflow pipe 15, and the second overflow pipe 15 is arranged near the fine filter chamber 8 On the inner wall of the water collection chamber 9, the negative pressure pipe 14 is arranged above the second overflow pipe 15, the negative pressure pipe 15 is also provided with a vacuum pump 18, and the top of the water collection tray 2 is also provided with at least one spray nozzle 19 , the nozzle 19 is in communication with the spray water pipe 17, and the water pump 28 is also arranged on the spray water pipe 17; the slag discharge pipe 16 is also provided at the bottom of the shell 1, and the slag discharge pipe 16 passes through the collecting pipe in turn. Water chamber 9, fine filter chamber 8 and buffer chamber 7 communicate with the bottom of settling chamber 6.

Specifically, a second filter screen 25 is also provided between the annular guide groove 3 and the communication pipe 10 . Preferably, the water collecting pan 3 is an inclined annular water collecting pan, and the water collecting pan 3 is low in the center and high in the outside, which is convenient for collecting rainwater. When there is rainfall, the surface area of rainwater collection is increased through the water collecting tray 2, and more rainwater is collected, and the collected rainwater is collected into the annular guide groove 3 under the action of gravity, and then flows into the settling chamber 6 through the connecting pipe 10 for further precipitation. Filtration; and by setting the second filter screen 25 between the annular guide groove 3 and the connecting pipe 10, the rainwater is in the process of flowing into the connecting pipe 10 from the annular guide groove 3, and the second filter screen 25 is used to remove large particles of impurities in the rainwater , to avoid the blockage of the purification device caused by large particles of impurities.

Specifically, the green belt soil layer 4 is used for planting green belt plants 24 . Utilize the idle space at the top of the purification device to set it as the green belt soil layer 4 for planting green belt plants 24, improve the urban greening rate, and avoid direct sunlight. Preferably, the outer wall of the filter chamber 5 is also provided with a root-resistance layer 23; the root-resistance layer 23 is used to limit the growth of plant roots in the green belt, so as to avoid damaging the structure of the filter chamber 5 and the purification device due to the growth of plant roots in the green belt.

Specifically, the bottom of the settling chamber 6 is further provided with a slag collection cylinder 27 , the slag collection cylinder 27 has an inverted conical structure, and the slag discharge pipe 16 communicates with the bottom of the slag collection cylinder 27 . Rainwater enters the settling chamber 6 through the connecting pipe 10. During the accumulation process of rainwater in the settling chamber 6, the impurities in the rainwater slowly settle to the bottom of the settling chamber 6 and accumulate due to the low fluidity of the rainwater in the settling chamber 6 and the long residence time. After the rainwater has accumulated to a certain amount, the settled rainwater enters the filter chamber 5 through the first filter screen 11, and flows out of the buffer chamber 7 from the first overflow pipe of the filter chamber 5, and after the rainwater passes through the first filter screen 11 During the process of entering the filter chamber 5, the first filter screen 11 can effectively filter the impurities flowing with the water flow, and improve the sedimentation efficiency and sedimentation effect.

Specifically, a plurality of adsorption channels 26 are evenly arranged in the adsorption filler 13 of the fine filter chamber 8 . After the rainwater is treated in the settling chamber 6 and the filter chamber 5, it flows into the buffer chamber 7 through the first overflow pipe 12, and is temporarily stored in the buffer chamber 7. At the same time, the rainwater is further filtered and purified through the fine filter chamber 8, and the rainwater is filtered and purified under the action of gravity. Next, in the process of flowing from the buffer chamber 7 through the fine filter chamber 8, a plurality of adsorption channels 26 are arranged in the adsorption filler 13 of the fine filter chamber 8, so that a large amount of rainwater can be quickly filtered and purified through the adsorption channels 26, increasing the fineness. The rainwater treatment capacity of the filter chamber 8 per unit time improves the purification efficiency and purification effect of the device.

Specifically, the adsorption channel 26 is an “S” shaped adsorption channel 26 . The adsorption channel 26 is set as an "S"-shaped adsorption channel 26, thereby prolonging the filtration stroke of rainwater and prolonging the contact time between rainwater and the adsorption filler 13, thereby improving the filtration and purification efficiency and filtration and purification effect of the adsorption filler 13 on rainwater, ensuring that the device The water quality after treatment reaches the standard.

Specifically, an ultraviolet lighting unit 22 is also provided on the inner wall of the water collection chamber 9 for sterilizing the purified water. Preferably, the ultraviolet lighting unit 22 is illuminated by an ultraviolet lamp with a power supply. After the rainwater is treated by the fine filter chamber 8, it flows into the water collection chamber 9 for collection, and the water collected in the water collection chamber 9, under the action of the ultraviolet light unit 22, effectively sterilizes the water and improves the quality of the water body , to prolong the storage time of water in the water collection chamber 9; on the other hand, on the side wall of the water collection chamber 9, the spray water pipe 17 is set, and in the process of hot weather, the green belt planted on the green belt soil layer 4 When the plants 24 need to be watered, the water pump 28 is turned on, and under the action of the water pump 28, the water in the water collection chamber 9 is extracted, and flows to the nozzle 19 through the spray water pipe 17, and is sprayed to the green belt plants 24 by the nozzle 19, realizing The watering of the plants 24 in the green belt improves the utilization efficiency of water resources.

Specifically, the adsorption filler 13 is activated carbon, and the bottom surface of the adsorption filler 13 supports titanium dioxide. In the process of rainwater flowing to the water collection chamber 9 through the adsorption filler 13, the cooperation between the ultraviolet lighting unit 22 and the activated carbon loaded with titanium dioxide is used to make the activated carbon have a photocatalytic effect, which can effectively treat the macromolecular organic matter in the flowing water body. Adsorption and decomposition can improve the purification efficiency and purification effect of the device.

Specifically, an overflow valve 20 is provided on the second overflow pipe 15 , and a slag discharge valve 21 is also provided on the slag discharge pipe 16 . By setting the second overflow pipe 15 on the side wall of the water collection chamber 9, when a certain equipment needs to utilize the water body in the water collection chamber 9, the equipment is communicated with the second overflow pipe 15, and the overflow valve 20 is opened. , the water in the water collection chamber 9 flows out through the second overflow pipe 15, so as to improve the utilization rate of water resources; and a slag discharge valve 21 is set on the slag discharge pipe 16, and the impurities in the slag collection cylinder 27 gather to a certain level. When measuring, open the slag discharge valve 21, so that the impurities are discharged from the slag discharge pipe 16; or when the rainfall is large and exceeds the processing capacity of the device, open the slag discharge valve 21, so that the rainwater in the settling chamber 6 can directly pass through the discharge pipe 16. The slag pipe 16 is just discharged, reducing the working load of the device, and at the same time carrying out reasonable diversion of the rainwater to prevent the rainwater from accumulating into waterlogging.

When in use, when there is rainfall, the rainwater collection surface area is increased through the water collection tray 2 to collect more rainwater, and the collected rainwater is collected into the annular guide groove 3 under the action of gravity, and then flows into the settlement through the connecting pipe 10 Chamber 6, through the cooperation of filter chamber 5 and settling chamber 6 for sedimentation and filtration, impurities settle to the bottom of the slag collection cylinder 27, while rainwater is filtered through the first filter screen 11, and then flows into the buffer chamber 7 through the first overflow pipe 12. The buffer chamber 7 stays, and at the same time, it passes through the fine filter chamber 8 for deep filtration and purification, and finally falls into the water collection chamber 9 for collection to realize rainwater filtration and purification. It has high filtration efficiency and good filtration effect, which is of great significance to promote the application and development of sponge cities .

The above descriptions are only preferred embodiments of the present invention, and it should be understood that the present invention is not limited to the forms disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and Modifications can be made within the scope of the ideas described herein, by virtue of the above teachings or skill or knowledge in the relevant art. However, changes and changes made by those skilled in the art do not depart from the spirit and scope of the present invention, and should all be within the protection scope of the appended claims of the present invention.

Claims (4)

1. a kind of rainwater purification apparatus for building, it is characterised in that including water-collecting tray and housing, the water-collecting tray is arranged on housing Top, for collecting rainwater, the case top is additionally provided with annular guide channel and greenbelt soil horizon, and the annular guide channel surrounds Greenbelt soil horizon, filter chamber, expansion chamber, surge chamber, refined filtration room and collecting chamber are disposed with from top to bottom in the housing, The filter chamber is embedded in greenbelt soil horizon, and the annular guide channel bottom even is provided with more communicating pipes, the connection The both ends of pipe connect with annular guide channel, expansion chamber respectively, and the filter chamber connects with expansion chamber, and filter chamber and the company of expansion chamber Connect end and be additionally provided with the first screen pack, the first overflow pipe is additionally provided with the side wall of filter chamber, the filter chamber overflows by first Flow tube connects with surge chamber, and the surge chamber is cavity, for the temporary water after filter chamber filters, refined filtration room both ends point Do not connected with surge chamber, collecting chamber, adsorption stuffing is filled with refined filtration room, it is described to catchment for carrying out depth-type filtration to rainwater Negative tube, spray header and the second overflow pipe are also respectively provided with the side wall of room, second overflow pipe is set close to refined filtration room Put and catchmenting in chamber interior walls, the negative tube is arranged on the top of the second overflow pipe, and vavuum pump is additionally provided with negative tube, described At least one shower nozzle is additionally provided with the top of water-collecting tray, the shower nozzle connects with spray header, is additionally provided with the spray header Water pump；The housing bottom is additionally provided with scum pipe, and the scum pipe sequentially passes through collecting chamber, refined filtration room and surge chamber, and with The bottom connection of expansion chamber, is additionally provided with the second screen pack between the annular guide channel and the communicating pipe.

2. a kind of rainwater purification apparatus for building according to claim 1, it is characterised in that the expansion chamber bottom is also set Collection slag cylinder is equipped with, as inverted cone-shaped structure, the scum pipe connects the slag cylinder that integrates with collection slag cylinder bottom.

A kind of 3. rainwater purification apparatus for building according to claim 1, it is characterised in that refined filtration room adsorption stuffing Inside also it is evenly arranged with a plurality of sorption channel.

4. a kind of rainwater purification apparatus for building according to claim 3, it is characterised in that the sorption channel is " S " Shape sorption channel.