CN101306869A - Modified zeolite biological filter process method for waste water and landscape water and apparatus - Google Patents
Modified zeolite biological filter process method for waste water and landscape water and apparatus Download PDFInfo
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- CN101306869A CN101306869A CNA2008100435313A CN200810043531A CN101306869A CN 101306869 A CN101306869 A CN 101306869A CN A2008100435313 A CNA2008100435313 A CN A2008100435313A CN 200810043531 A CN200810043531 A CN 200810043531A CN 101306869 A CN101306869 A CN 101306869A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
The invention discloses a modified zeolite biological filter treatment method for water of water landscapes in residential districts and a device thereof. Sewage of a polluted reclaimed water landscape pool is pumped into an intake water storage tank through an intake pump, is sucked into a water regulating tank through a metering pump and a water inlet pipe of the metering pump, then flows into a modified zeolite filler zone from a perforated grill on the bottom of the water regulating tank, fully contacts modified zeolite and a biomembrane adhered to the modified zeolite to remove pollutants, then flows into a discharge bay through an overflow sedimentation tank, and then is redrained into the reclaimed water landscape pool through a water outlet pipe. The modified zeolite filler zone is in facultative environment, dissolved oxygen (DO) of the modified zeolite filler zone is maintained at 1mg/l or so, and the hydraulic retention time is 1 hour or so. The needed oxygen is provided by an aerator and an aerated conduit of the aerator, and a vent pipe can be adopted when the vent is needed. The modified zeolite is modified through high temperature roasting, and is evenly added into a biological filter along with activated sludge, and the liquid level maintains to be level with the surface of the modified zeolite. The method and the device are adopted to treat, target-hitting effect of water quality is remarkable, the cost is low and secondary pollution is avoided.
Description
Technical field
The present invention relates to a kind of modified zeolite biological filter treatment process and device thereof that is used for sub-district water landscape polluted-water, belong to water technology and water resources recycle utilization field.
Background technology
Along with the raising of people's living standard and human settlement's quality, people are also more and more higher to the requirement of the outside places of cultural interest, greening and the physical environment of whole residential quarter.In urban green space, construction of park and large-scale landmark building district, artificial lake, sloot and landscape pond continue to bring out.From the angle " water scenery " of human settlements many advantages are arranged, but raising along with the level of urbanization and industrialization degree, it is serious day by day that shortage of water resources and water pollute aggravation, and reusing sewage has become and solves urban water shortage, improves the water resources effective rate of utilization, effectively controls an important channel of water pollution at present.
Because middle water is from the certain sanitary sewage of handling of process or does not comprise the heavily contaminated trade effluent at interior municipal effluent, though water is nontoxic therefore, but the relative natural river course of its pollutent background values (lake) water is higher, and its self-cleaning dilution capacity is poor than natural river course (lake) water body.In addition, manmade landscape, artificial landscape's water body belongs to shallow water body, and the depth of water generally is no more than 2 meters, and sluggish flow.For this reason, in the employing water as the middle water landscape water body of former water and make up water than the easier generation eutrophication problem of natural river course (lake).
Nitrogen, phosphorus index request are higher than the critical indicator of natural water body eutrophication level in " urban sewage reutilization water for scenic environment use water quality (GB/T18921-2002) ", therefore, eutrophication problem is that middle water is back to the subject matter that landscape water body at first will be considered, must take measures to prevent and control the generation of landscape water body eutrophication.Nitrogen-containing pollutant is one of principal element that causes body eutrophication.Ammonia nitrogen be the most general in the present sewage also be to influence bigger nitrogen pollutant.Present Sewage Plant secondary effluent often index such as ammonia nitrogen, total nitrogen does not reach the water quality emission standard.Existing common process can't guarantee water quality.Along with people prevent the raising that the body eutrophication aspect is familiar with, various denitrogenation methods occur in succession.At present, the method for denitrogenation commonly used is membrane filter method, biological process and absorption method both at home and abroad.
Membrane filter method can make effluent quality well be improved, but the cost of film is higher, generally only limits to water quality requirement higherly, handles the less occasion of the water yield and uses, as small-sized degree of depth water treatment etc.; And the processing water yield of landscape water is all very big, and it is unpractical obviously utilizing the method for membrane filtration to handle landscape water.
Traditional biological process is to adopt activated sludge process, promptly takes the anaerobic-aerobic two-stage process, utilizes nitration reaction and the anti-nitration reaction of microorganism, and the nitrogen in the sewage is removed.This method is removed the organism in the water for polluting comparatively serious water body, and conventional indexs such as colourity, turbidity have good removal effect, and cost is lower.Yet floor space is bigger, and technology is comparatively complicated.But this method is used for the water body of little pollution to be handled, and cost is higher.
Utilizing natural non-metallic minerals Study on wastewater treatment is one of focus of current research.Wherein, " micro porous molecular sieve " structure of zeolite has not only determined its good adsorption and ion exchangeable, and is fit to very much the microorganism growth breeding, thereby causes the extensive concern of water treatment aspect.Zeolite being applied in the water treatment, can causing secondary pollution to environment in use and treating processes, is a kind of environment-friendly material.Utilize the absorption of zeolite and ion-exchange character to remove pollutent, have that floor space is little, technology is simple, an advantage such as easy to operate, fast efficient and non-secondary pollution.
Yet, though natural zeolite has the good adsorption performance, often to be blocked and arrange shortcomings such as even inadequately by impurity because of the duct, its adsorption fails to give full play to.Simultaneously, zeolite is that the aqueous phase ammonia nitrogen is concentrated and transfers in the zeolite solid phase by absorption and ion exchange, but can fundamentally not remove ammonia nitrogen; After zeolite reached capacity, the chemical regeneration cost was very high; Zeolite is to other form nitrogen except that ammonia nitrogen (as nitrite nitrogen, nitre nitrogen, organonitrogen) not removal effect substantially, and this has limited its application in water treatment field.
In sum, make a general survey of various landscape water treatment technologies and denitride technology now, no matter adopt which kind of single view treatment technology, there is problem more or less respectively at aspects such as economy, energy consumption, timeliness or secondary pollution controls, do not have economic, reliable practical approach of a cover or system so far.
Summary of the invention
The invention discloses a kind of modified zeolite biological filter treatment process and device thereof, its purpose is to overcome the available technology adopting membrane filter method, because the cost of film is higher, only limits to handle the less occasion of the water yield and uses; Adopt traditional biological process floor space bigger, technology is comparatively complicated, and the water body that is used for little pollution is handled, and cost is higher; Utilize natural non-metallic minerals to handle waste water, can fundamentally not remove ammonia nitrogen, after zeolite reached capacity, the chemical regeneration cost was very high, simultaneously to the drawback such as removal effect not substantially of other form nitrogen except that ammonia nitrogen.No matter adopt which kind of single view treatment technology, all can not reach promising result.
For overcoming above-mentioned shortcoming, the present invention proposes a kind of modified zeolite biological filter treatment process and device thereof that is used for sub-district water landscape polluted-water, purpose is to provide a kind of economical and efficient free of contamination new technology for the purification of water quality of middle water landscape water body.By making up a kind of like this treatment process and system and device thereof that combines biological and modified zeolite advantage of modified zeolite biological filter, realize the purification of water quality of water landscape water body in the sub-district, solve current view polluted-water treatment process the nitrogen that can't effect a radical cure and the problem of dissolubility pollutant.
Water landscape water modified zeolite biological filter treatment process in the sub-district, it is characterized in that: water landscape pond sewage is squeezed into into water water tank by intake pump in contaminated, after volume pump and water inlet pipe thereof sink water yield equalizing tank, go into the modified zeolite packing area from the bottom perforated plate current, and contact fully with modified zeolite and the microbial film that adheres to thereof, pollutent is removed, then after the overflow settling tank flows into outlet sump, water landscape pond in rising pipe enters again.
Described modified zeolite packing area is the oxygen environment of holding concurrently, and its dissolved oxygen (DO) remains on about 1mg/L, and hydraulic detention time is about 1h.Required oxygen is provided by aerator and aeration tube thereof, can adopt blow-down pipe when needing emptying.
Described modified zeolite carries out modification by high-temperature roasting, and the modified zeolite hole that obtains is increased, and specific surface area increases, and crystalline form obtains reforming, and improves absorption and ion-exchange performance to ammonia nitrogen, helps biological attachment on its surface.
Described modified zeolite packing area is that modified zeolite is rendered in the biological filter, and it is equal with the modified zeolite face that the biological filter liquid level keeps.
Described microbial film is that active sludge evenly is added in the modified zeolite biological filter, and every day, aeration was 4 hours, stopped 4 hours, and so circulation, and add nutritive substances such as glucose and volatile salt, quicken microbial film and grow at zeolite surface.
When a large amount of brown flosss grow in the modified zeolite surface, the zeolite skin section is divided and green algae occurred, and when occurring a large amount of zooplankton, reduces the time of aeration gradually, up to aeration 1 hour every day.
Water landscape water modified zeolite biological filter treatment unit in the sub-district, middle water landscape pond is connected with the water inlet water tank through water inlet pipe by intake pump, volume pump is connected with water yield equalizing tank with the water inlet water tank through water inlet pipe, it is characterized in that: be connected perforation plate bottom the wallboard between modified zeolite packing area and the water yield equalizing tank; The modified zeolite packing area is connected successively with settling tank, outlet sump, and settling tank is lower than the modified zeolite packing area, and outlet sump is lower than settling tank; The outlet of water yield equalizing tank, modified zeolite packing area, settling tank, outlet sump bottom is connected with blow-down pipe.
The water inlet pipe of water yield equalizing tank is connected the sidewall in pond, and the rising pipe of outlet sump is connected the sidewall of outlet sump.
Evenly be connected with at least 3 aeration arms at interval on its sidewall of modified zeolite packing area, all aeration arms are connected in parallel on the aeration tube, and aeration tube is connected with aerator.
The present invention is owing to microbial film inside reduces to the dissolved oxygen concentration near modified zeolite surface one side gradually from close water body one side, therefore can realize synchronous nitration and denitrification effect (SND), make under short time and lower aeration rate condition, realize ammonia nitrogen and the good removal effect of total nitrogen.In addition, microorganism can also absorb the adsorbed ammonia nitrogen of modified zeolite and carry out nitration reaction, and then carries out anti-nitration reaction, and the pollutent that originally is adsorbed onto in the modified zeolite hole is removed, and the hole obtains mediation, thereby modified zeolite obtains regeneration.
The present invention is used for the modified zeolite biological filter treatment process and the device thereof of sub-district water landscape polluted-water, simultaneously based on absorption principle and biological respinse principle, need not other dosing coagulant, dynamically water inlet, dynamically water outlet in the operational process, because the good nitrogen removal performance of modified zeolite, shortened the hydraulic detention time of device greatly, aeration rate also significantly reduces, and every day, aeration 1h got final product.The natural zeolite wide material sources, cheap and easy to get; Method of modifying technology is simple, and its saturated back is by biological action regeneration, and cost is low and avoided secondary pollution; Low from putting into operation energy consumption, cost is low, and convenient operating maintenance.
The present invention also has following characteristics and positively effect:
(1) the former water of water landscape water body and additional water source in the sub-district adopt community life sewage to reach the middle water of water for scenic environment use water quality standard (GB/T 18921-2002) after treatment, reduce water pollution, conserve water resource to greatest extent.
(2) adopt the packing area of modified zeolite biological filter treatment unit has the modified zeolite of very high adsorption effect to insert to ammonia nitrogen.And on modified zeolite, carry out biofilm, and utilize modified zeolite and biomembranous combined action in low dissolved axygen, reach good denitrification effect in the short hydraulic detention time, and pollutents such as COD are also had good removal effect.Effluent quality reaches water for scenic environment use water quality standard (GB/T 18921-2002).
(3) in the modified zeolite biological filter, after the modified zeolite adsorb ammonia nitrification, do not need device is stopped, can impel it to recover to adsorb the ability of ammonia nitrogen again by biological action, be that modified zeolite obtains regeneration, its regeneration cost is low and can not produce the secondary pollution problem.
(4) modified zeolite biological filter treatment unit, in continuous operational process, lateral intake, the side direction water outlet, mode is flexible, makes this device more flexible on the layout of water treatment.
(5) be used for the modified zeolite biological filter treatment process and the device thereof of sub-district water landscape polluted-water, combine absorption, ion-exchange and the biologic treating technique advantage of modified zeolite, as shown in table 1, and connect with computer by volume pump, magnetic valve, controller etc., according to the water-quality guideline value that water quality monitoring system obtains, realize the automatization of high-level device operation and water quality monitoring (WQM).
Table 1 modified zeolite biological filter treatment process and traditional landscape water facture are relatively
Description of drawings
Accompanying drawing 1 is a water landscape water modified zeolite biological filter treatment unit synoptic diagram in the sub-district.
1. middle water landscape pond, 2. intake pump, 3. water inlet water tank, 4. volume pump, 5. water inlet pipe, 6. water yield equalizing tank, 7. perforation plate, 8. modified zeolite packing area, 9. settling tank, 10. outlet sump, 11. aeration tubes, 12. aerators, 13. rising pipes, 14. blow-down pipes.
Embodiment
The present invention is described in detail below in conjunction with drawings and Examples, but present embodiment is not limited to the present invention, and every employing analog structure of the present invention and similar variation thereof all should be listed protection scope of the present invention in.
Technical scheme of the present invention is a kind of modified zeolite biological filter treatment process and device thereof of being used for sub-district water landscape polluted-water that combines modified zeolite absorption and biological action advantage.As shown in Figure 1: water landscape pond 1 sewage is squeezed into into water water tank 3 by intake pump 2 in contaminated, after volume pump 4 and water inlet pipe 5 thereof sink water yield equalizing tank 6, flow into modified zeolite packing area 8 from bottom perforated plate 7, and contact fully with modified zeolite and the microbial film that adheres to thereof, pollutent is removed, then after overflow settling tank 9 flows into outlet sumies 10, water landscape pond 1 in rising pipe 13 enters again.The modified zeolite packing area is the oxygen environment of holding concurrently, and its dissolved oxygen (DO) remains on about 1mg/L, and hydraulic detention time is about 1h.Required oxygen is provided by aerator 12 and aeration tube 11 thereof, can adopt blow-down pipe 14 when needing emptying.In this device, it is equal with the modified zeolite face that modified zeolite packing area liquid level keeps, and sewage is by the pollutent in the water landscape water body in the effect of modified zeolite favourable absorption, ion exchangeable effect and the biological membrane biological effect combined removal.
Based on the absorption property of natural zeolite itself to ammonia nitrogen, by the high-temperature roasting method natural zeolite is carried out the modification development, the modified zeolite hole that obtains is increased, specific surface area increases, crystalline form obtains reforming, absorption and ion-exchange performance to ammonia nitrogen improve greatly, and more help biological attachment on its surface, thereby have increased biomass.Owing to the good removal ammonia nitrogen effect of modified zeolite, in device, can well weaken the peak value of influent ammonia nitrogen, create a good living environment for microorganism simultaneously, help the removal of pollutent efficient stable.
The used active sludge of microbial film is taken from the second pond returned sluge of sewage work, evenly be added to active sludge in the modified zeolite biological filter, every day, aeration was 4 hours, stopped 4 hours, so circulation, make active sludge be uniformly distributed in the modified zeolite surface, and regularly add nutritive substances such as glucose and volatile salt, quicken microbial film and grow at zeolite surface.After for some time, finding has a large amount of brown flosss to grow in the modified zeolite surface, and the zeolite skin section is divided and green algae occurred, and occurs a large amount of zooplanktons, and this expression has formed sophisticated microbial film.After this reduce the time of aeration gradually, up to aeration 1 hour every day.
After microbial film formation and the maturation, middle water landscape polluted water is crossed in the modified zeolite biological filter process in Continuous Flow, is purified processing, and it is equal with the modified zeolite face that wherein modified zeolite biological filter keeps liquid level.This device can well be removed pollutants in sewage in the short period of time.Simultaneously,, make under short time and lower aeration rate condition, realize ammonia nitrogen and the good removal effect of total nitrogen because dissolved oxygen concentration difference between the microbial film can realize synchronous nitration and denitrification effect (SND).In addition, microorganism can also absorb the adsorbed ammonia nitrogen of modified zeolite and carry out nitration reaction, and then carries out anti-nitration reaction, and the pollutent that originally is adsorbed onto in the modified zeolite hole is removed, and the hole obtains mediation, thereby modified zeolite obtains regeneration.
Water landscape water modified zeolite biological filter treatment unit in the sub-district, middle water landscape pond 1 is connected with water inlet water tank 3 through water inlet pipe 5 by intake pump 2, volume pump 4 is connected with water yield equalizing tank 6 with water inlet water tank 3 through water inlet pipe 5, is characterized in: be connected perforation plate 7 bottom the wallboard between modified zeolite packing area 8 and the water yield equalizing tank 6; Modified zeolite packing area 8 is connected successively with settling tank 9, outlet sump 10, and settling tank 9 is lower than modified zeolite packing area 8, and outlet sump 10 is lower than settling tank 9; The outlet of water yield equalizing tank 6, modified zeolite packing area 8, settling tank 9, outlet sump 10 bottoms is connected with blow-down pipe 14; The water inlet pipe 5 of water yield equalizing tank 6 is connected the sidewall in pond, and the rising pipe 13 of outlet sump 10 is connected the sidewall of outlet sump.Evenly be connected with at least 3 aeration arms at interval on 8 its sidewalls of modified zeolite packing area, 3 aeration arms are connected in parallel on the aeration tube 11, and aeration tube 11 is connected with aerator 12.
The present invention is used for the modified zeolite biological filter treatment process and the device thereof of sub-district water landscape polluted-water, simultaneously based on absorption principle and biological respinse principle, need not other dosing coagulant, because the good nitrogen removal performance of modified zeolite, shortened the hydraulic detention time of device greatly, aeration rate also significantly reduces, and every day, aeration 1h got final product.The natural zeolite wide material sources, cheap and easy to get; And method of modifying technology is simple, and saturated back is by biological action regeneration, and cost is low and avoided secondary pollution; Low from putting into operation energy consumption, cost is low, and convenient operating maintenance.
The modified zeolite biological filter device that is used for sub-district water landscape polluted-water can pass through volume pump, magnetic valve, controller etc. and connect with computer, according to the water-quality guideline value that water quality monitoring system obtains, realizes the automatization of high-level device operation and water quality monitoring (WQM).
Adopt method of the present invention and device effluent quality after treatment thereof can reach landscape water quality standard (GB/T18921-2002).The present invention can be widely used in the water treatment and the recycle of all kinds of view water systems.
Claims (9)
1. water landscape water modified zeolite biological filter treatment process in the sub-district, it is characterized in that: water landscape pond sewage is squeezed into into water water tank by intake pump in contaminated, after volume pump and water inlet pipe thereof sink water yield equalizing tank, go into the modified zeolite packing area from the bottom perforated plate current, and contact fully with modified zeolite and the microbial film that adheres to thereof, pollutent is removed, then after the overflow settling tank flows into outlet sump, water landscape pond in rising pipe enters again.
2. water landscape water modified zeolite biological filter treatment process in the sub-district according to claim 1 is characterized in that: described modified zeolite packing area is the oxygen environment of holding concurrently, and its dissolved oxygen (DO) remains on about 1mg/L, and hydraulic detention time is about 1h; Required oxygen is provided by aerator and aeration tube thereof, can adopt blow-down pipe when needing emptying.
3. water landscape water modified zeolite biological filter treatment process in the sub-district according to claim 1, it is characterized in that: described modified zeolite carries out modification by high-temperature roasting, the modified zeolite hole that obtains is increased, specific surface area increases, crystalline form obtains reforming, raising helps biological attachment on its surface to the absorption and the ion-exchange performance of ammonia nitrogen.
4. water landscape water modified zeolite biological filter treatment process in the sub-district according to claim 1, it is characterized in that: described modified zeolite packing area is that modified zeolite is rendered in the biological filter, it is equal with the modified zeolite face that the biological filter liquid level keeps.
5. water landscape water modified zeolite biological filter treatment process in the sub-district according to claim 1, it is characterized in that: described microbial film is evenly to be added to active sludge in the modified zeolite biological filter, every day, aeration was 4 hours, stopped 4 hours, so circulation, and add nutritive substances such as glucose and volatile salt, quicken microbial film and grow at zeolite surface.
6. water landscape water modified zeolite biological filter treatment process in the sub-district according to claim 1, it is characterized in that: when a large amount of brown flosss grow in the modified zeolite surface, the zeolite skin section is divided and green algae occurred, and when a large amount of zooplankton is arranged, reduce the time of aeration gradually, up to aeration 1 hour every day.
7. water landscape water modified zeolite biological filter treatment unit in the sub-district, middle water landscape pond is connected with the water inlet water tank through water inlet pipe by intake pump, volume pump is connected with water yield equalizing tank with the water inlet water tank through water inlet pipe, it is characterized in that: be connected perforation plate bottom the wallboard between modified zeolite packing area and the water yield equalizing tank; The modified zeolite packing area is connected successively with settling tank, outlet sump, and settling tank is lower than the modified zeolite packing area, and outlet sump is lower than settling tank; The outlet of water yield equalizing tank, modified zeolite packing area, settling tank, outlet sump bottom is connected with blow-down pipe;
8. water landscape water modified zeolite biological filter treatment unit in the sub-district according to claim 7, it is characterized in that: the water inlet pipe of water yield equalizing tank is connected the sidewall in pond, and the rising pipe of outlet sump is connected the sidewall of outlet sump.
9. water landscape water modified zeolite biological filter treatment unit in the sub-district according to claim 7, it is characterized in that: evenly be connected with at least 3 aeration arms on its sidewall of modified zeolite packing area at interval, all aeration arms are connected in parallel on the aeration tube, are connected with aerator.
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| CNA2008100435313A CN101306869A (en) | 2008-06-20 | 2008-06-20 | Modified zeolite biological filter process method for waste water and landscape water and apparatus |
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| CNA2008100435313A CN101306869A (en) | 2008-06-20 | 2008-06-20 | Modified zeolite biological filter process method for waste water and landscape water and apparatus |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101774718A (en) * | 2009-01-14 | 2010-07-14 | 张大伟 | Lake water pollution prevention and control method and device |
| CN102092844A (en) * | 2010-12-23 | 2011-06-15 | 湖南海尚环境生物科技有限公司 | Lantern type biological filler unit module and lantern type biological trickling filter |
| CN101885555B (en) * | 2009-05-12 | 2012-04-25 | 江西金达莱环保研发中心有限公司 | Method for treating fermentative pharmaceutical wastewater |
| CN103991961A (en) * | 2014-05-30 | 2014-08-20 | 上海理工大学 | Method and device for processing zeolite biological filter modified by reclaimed water-based landscape water |
| CN106927648A (en) * | 2017-05-18 | 2017-07-07 | 广州普邦园林股份有限公司 | A kind of landscape water body circulation process method |
-
2008
- 2008-06-20 CN CNA2008100435313A patent/CN101306869A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101774718A (en) * | 2009-01-14 | 2010-07-14 | 张大伟 | Lake water pollution prevention and control method and device |
| CN101774718B (en) * | 2009-01-14 | 2014-01-01 | 张大伟 | Lake water pollution prevention and control method and device |
| CN101885555B (en) * | 2009-05-12 | 2012-04-25 | 江西金达莱环保研发中心有限公司 | Method for treating fermentative pharmaceutical wastewater |
| CN102092844A (en) * | 2010-12-23 | 2011-06-15 | 湖南海尚环境生物科技有限公司 | Lantern type biological filler unit module and lantern type biological trickling filter |
| CN103991961A (en) * | 2014-05-30 | 2014-08-20 | 上海理工大学 | Method and device for processing zeolite biological filter modified by reclaimed water-based landscape water |
| CN106927648A (en) * | 2017-05-18 | 2017-07-07 | 广州普邦园林股份有限公司 | A kind of landscape water body circulation process method |
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Open date: 20081119 |