CN113006195A - Environment-friendly garden landscape rainwater treatment and reuse method - Google Patents
Environment-friendly garden landscape rainwater treatment and reuse method Download PDFInfo
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- CN113006195A CN113006195A CN202110247484.XA CN202110247484A CN113006195A CN 113006195 A CN113006195 A CN 113006195A CN 202110247484 A CN202110247484 A CN 202110247484A CN 113006195 A CN113006195 A CN 113006195A
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F1/00—Methods, systems, or installations for draining-off sewage or storm water
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B3/00—Methods or installations for obtaining or collecting drinking water or tap water
- E03B3/02—Methods or installations for obtaining or collecting drinking water or tap water from rain-water
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F1/00—Methods, systems, or installations for draining-off sewage or storm water
- E03F1/006—Pneumatic sewage disposal systems; accessories specially adapted therefore
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F5/00—Sewerage structures
- E03F5/10—Collecting-tanks; Equalising-tanks for regulating the run-off; Laying-up basins
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F5/00—Sewerage structures
- E03F5/10—Collecting-tanks; Equalising-tanks for regulating the run-off; Laying-up basins
- E03F5/105—Accessories, e.g. flow regulators or cleaning devices
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F5/00—Sewerage structures
- E03F5/14—Devices for separating liquid or solid substances from sewage, e.g. sand or sludge traps, rakes or grates
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F2201/00—Details, devices or methods not otherwise provided for
- E03F2201/10—Dividing the first rain flush out of the stormwater flow
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/108—Rainwater harvesting
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- Hydrology & Water Resources (AREA)
- Water Supply & Treatment (AREA)
- Health & Medical Sciences (AREA)
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- Environmental & Geological Engineering (AREA)
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- Biodiversity & Conservation Biology (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The application relates to the field of rainwater treatment, and particularly discloses an environment-friendly garden landscape rainwater treatment and recycling method. The environment-friendly garden landscape rainwater treatment and recycling method comprises the following steps: step 1), collecting rainwater; step 2), treating initial rainwater: physically filtering and removing slag from initial rainwater, adding a coagulant for stirring, wherein the addition amount of the coagulant is 0.1-0.15% of the total mass of the sewage, the stirring speed is 1.6-2.0r/s, the stirring time is 5-10min, standing for 0.4-0.6h, and then aerating, precipitating, draining and denitrifying after idling to obtain purified water; step 3), rainwater is recycled; the coagulant comprises the following components in parts by weight: 10-20 parts of a coagulant; 5-10 parts of tara tannin extract; 4-8 parts of chitin; 1-3 parts of yellow flag powder; 0.5-1.0 part of coagulant aid. The environment-friendly garden landscape rainwater treatment and recycling method has the advantages of being environment-friendly and excellent in water treatment capacity.
Description
Technical Field
The application relates to the field of rainwater treatment, in particular to an environment-friendly garden landscape rainwater treatment and recycling method.
Background
The rainwater is divided into initial rainwater and later rainwater, wherein the initial rainwater is rainwater in the early stage of rainfall, and generally refers to rainfall with surface runoff formed by the thickness of 10-15mm on the ground. In the early stage of rainfall, a large amount of acid gases, automobile exhaust, factory waste gas and other pollutant gases in the air are dissolved in the rainwater, and after the rainwater falls to the ground, the rainwater in the early stage contains a large amount of pollutants due to scouring of roofs, asphalt concrete roads and the like, so that the pollution degree of the rainwater in the early stage is higher and even exceeds that of common urban sewage. The rainwater pipe directly discharges into the river channel, the water supply environment is polluted to a certain degree, the rainwater pipe is not suitable for directly irrigating garden landscapes, later-stage rainwater refers to rainwater which rains for 15-30min, and the later-stage rainwater is relatively clean and can be generally directly used for irrigating plants in gardens and forests, so that the rainwater is recycled.
The rainwater contains a large amount of pollutants such as organic matters, pathogens, heavy metals, grease, suspended solids and the like in early stage rainwater, the early stage rainwater needs to be treated in order to realize the reutilization of the early stage rainwater, most of the commonly used coagulants are chemically synthesized in order to achieve better treatment effect in the conventional rainwater treatment, but the following problems are that the treated sediments are difficult to degrade, and plant components are added in the related technology to reduce the burden of the coagulants on the environment.
In view of the above-mentioned related technologies, the inventor believes that adding plant components to the coagulant to reduce the addition of synthetic coagulant can make the sediment more easily degradable, but because the coagulant of plant components generally has poor water treatment capacity, the requirement of treating the initial rainwater cannot be met, and at present, there are few coagulants which are easy to degrade and have good water treatment capacity in the market, and the requirement of recycling rainwater cannot be met, so there is room for improvement.
Disclosure of Invention
In order to quickly treat initial rainwater, the application provides an environment-friendly garden landscape rainwater treatment and recycling method.
An environment-friendly garden landscape rainwater treatment and recycling method comprises the following steps:
step 1), collecting rainwater: collecting rainwater within 15-30min from the beginning of raining as initial rainwater, and collecting rainwater 15-30min after the beginning of raining as later rainwater;
step 2), treating initial rainwater: physically filtering and removing slag from initial rainwater, adding a coagulant for stirring, wherein the addition amount of the coagulant is 0.1-0.15% of the total mass of the sewage, the stirring speed is 1.6-2.0r/s, the stirring time is 5-10min, standing for 0.4-0.6h, and then aerating, precipitating, draining and performing idle denitrification to obtain purified water;
step 3), rainwater recycling: collecting the purified water into later-stage rainwater, fully stirring and irrigating the garden landscape;
the coagulant comprises the following components in parts by mass:
10-20 parts of a coagulant;
5-10 parts of tara tannin extract;
4-8 parts of chitin;
1-3 parts of yellow flag powder;
0.5-1.0 part of coagulant aid.
By adopting the technical scheme, the tara tannin extract is adopted.
Preferably, the coagulant comprises the following components in parts by weight:
16-18 parts of a coagulant;
7.5-7.8 parts of tara tannin extract;
5.6-5.8 parts of chitin;
2.4-2.6 parts of yellow flag powder;
0.74-0.78 parts of coagulant aid.
By adopting the technical scheme, the addition of the synthetic components is reduced by adding the tara tannin extract, the chitin and the acorus calamus powder which are easily degradable plants, so that the waste generated after the sewage is treated by the coagulant is easily degraded, and the burden of the rainwater treatment on the environment is reduced.
Because the tarragon extract, the chitin and the acorus calamus powder are added simultaneously and cooperatively matched according to a specific proportion, the acorus calamus powder relieves the inhibiting effect between the tarragon extract and the chitin when initial rainwater is flocculated to form a macromolecular group, so that the thickness of a diffusion layer is easier to reduce when two colloidal particles in sewage are close to each other, the potential of ZETA is reduced, the mutual repulsion force of the two colloidal particles is reduced, the distance of mutual collision between the two colloidal particles is reduced, the resultant force of repulsion and attraction between the colloidal particles is changed into main force by the repulsion force when only the tarragon extract and the chitin are added, the suction force when the tarragon extract, the chitin and the acorus calamus powder are added simultaneously is taken as the main force, the repulsion potential energy between the colloidal particles in the initial rainwater is greatly reduced or even disappears due to the addition of the acorus calamus powder, the colloidal particles are rapidly coagulated and deposited, and simultaneously due, the tara tannin extract and the chitin form a stable reticular molecular chain structure, so that the contact chance of colloid particles is greatly increased, the colloid in the initial rainwater is better flocculated, the processing capacity of the coagulant on the rainwater is greatly improved, and the water quality after the initial rainwater is processed can water garden landscapes.
Preferably, the coagulant comprises aluminum sulfate and ferrous sulfate, and the mass ratio of the aluminum sulfate to the ferrous sulfate is 1: 2-4.
Through adopting above-mentioned technical scheme, owing to adopt the complex of aluminum sulfate and ferrous sulfate as the coagulant, aluminum sulfate and ferrous sulfate are as coagulant to water temperature and pH's change strong adaptability, it is less to the corrosivity of equipment, make the water treatment effect keep more stable state, and because both cooperate with specific proportion, very high electric charge produces very strong appeal to the pollutant, after the pollutant is adsorbed, functional group is penetrated and destroyed by chemical action, make the micelle destabilize and form tiny aggregate, make the coagulation process go on more fully, make the quality of water after the processing better, make watering view water quality better, thereby make the rainwater of recycling water landscape better.
Preferably, the coagulant aid comprises fly ash and galactomannan, and the mass ratio of the fly ash to the galactomannan is 1: 0.5-0.8.
By adopting the technical scheme, the coal ash and the galactomannan are compounded in a specific ratio, so that the structure of flocs can be improved, the particle size and the solidity of alum flocs are increased, the formed flocs are not easy to break in the stirring process to form small flocs, the formed flocs can be well settled, and the treated water quality is further improved.
Preferably, the coagulant also comprises 0.32 to 0.48 part by mass of propylene glycol alginate.
By adopting the technical scheme, the propylene glycol alginate is added, and the propylene glycol alginate is cooperatively matched with the tara tannin extract, the chitin and the acorus calamus powder, so that the stability of the flocs is improved, functional groups which are bridging are not easy to separate from the surface of colloidal particles, and the flocs are not easy to disperse in the stirring process, thereby further improving the treatment capacity of the coagulant on initial rainwater.
Preferably, the propylene glycol alginate has a molecular weight of 10 to 20 ten thousand.
By adopting the technical scheme, the propylene glycol alginate with the molecular weight of 10-20 ten thousand is adopted, so that the propylene glycol alginate can be rapidly dispersed in initial rainwater, the stability of formed flocs can be efficiently increased, the formed flocs can be well settled, and the treated water quality is further improved.
Preferably, the coagulant feeding method comprises the following steps: adding the coagulant, tara tannin extract, chitin and propylene glycol alginate into alkaline water with pH of 7-7.8 sequentially at rotation speed of 260-.
Preferably, when the coagulant is added, 0.32-0.48 parts by mass of propylene glycol alginate and the coagulant are added into the alkaline water together.
By adopting the technical scheme, the coagulant, the tara tannin extract, the chitin, the coagulant aid and the propylene glycol alginate are dispersed by using the alkaline water and then added into the sewage, so that the coagulant is not easy to agglomerate in the sewage to weaken the coagulation of pollutants, more and more stable flocs are formed due to more sufficient contact, harmful substances in the sewage are further reduced, and meanwhile, the addition of the coagulant is reduced, thereby further reducing the cost for treating the sewage.
Preferably, the temperature of the alkaline water is 50-55 ℃.
By adopting the technical scheme, the temperature of the alkaline water is 50-55 ℃, so that the activity of active substances in the coagulant is higher, the coagulant can better act on initial rainwater to form stable large flocs, the flocs are easier to settle, and the treatment capacity of the initial rainwater is improved.
In summary, the present application has the following beneficial effects:
1. this application adopts this application to adopt tara tannin extract, chitin and yellow flag powder, make the discarded object after sewage treatment more easily degrade, the burden of environment has been alleviateed, the three cooperates with specific proportion simultaneously, yellow flag powder has alleviated tara tannin extract and chitin to initial stage rainwater throughput's inhibitory action, make repulsion potential energy between the micelle descend greatly or disappear even among the initial stage rainwater, contact chance with colloidal particle increases greatly in the same time, thereby make the throughput of initial stage rainwater promote greatly.
2. The application preferably adopts the propylene glycol alginate, and the propylene glycol alginate is cooperatively matched with the tara tannin extract, the chitin and the acorus calamus powder, so that functional groups which are bridging are not easy to separate from the surface of colloidal particles, and the treatment capacity of the coagulant on initial rainwater is further improved.
3. The application preferentially adopts the alkali water to disperse the coagulant, the tara tannin extract, the chitin, the coagulant aid and the propylene glycol alginate ester to be added into the sewage, so that the harmful substances in the sewage are further reduced, and the addition of the coagulant is reduced, thereby further reducing the cost of sewage treatment.
Detailed Description
The sources of the raw materials in the examples and the preparations are shown in table 1.
TABLE 1
The present application will be described in further detail with reference to examples.
Examples of preparation of raw materials and/or intermediates
Preparation examples 1 to 4
The preparation example discloses a coagulant which is prepared from the following components:
coagulant, tara tannin extract, chitin, yellow flag powder and coagulant aid.
The coagulant is ferric trichloride.
The coagulant aid is lime.
The specific dosage is shown in Table 2, and the unit is Kg.
Preparation examples 5 to 6
The preparation example discloses a coagulant which is prepared from the following components:
coagulant, tara tannin extract, chitin, yellow flag powder and coagulant aid.
The coagulant is aluminum sulfate or ferrous sulfate.
The coagulant aid is lime.
The specific dosage is shown in Table 2, and the unit is Kg.
Preparation examples 7 to 8
The preparation example discloses a coagulant which is prepared from the following components:
coagulant, tara tannin extract, chitin, yellow flag powder and coagulant aid.
The coagulant is ferric trichloride.
The coagulant aid is fly ash and galactomannan.
The specific dosage is shown in Table 2, and the unit is Kg.
Preparation example 9
The preparation example discloses a coagulant which is prepared from the following components:
coagulant, tara tannin extract, chitin, yellow flag powder, propylene glycol alginate ester and coagulant aid.
The coagulant is ferric trichloride.
The coagulant aid is lime.
The molecular weight of the propylene glycol alginate is 3-5 ten thousand.
The specific dosage is shown in Table 2, and the unit is Kg.
Preparation example 10
The preparation example discloses a coagulant, which is different from the preparation example 9 only in that:
the molecular weight of the propylene glycol alginate is 10-20 ten thousand.
Comparative example 1
The only difference from preparation 3 is: equal amount of tara tannin extract is adopted to replace the yellow flag powder and the chitin.
Comparative example 2
The only difference from preparation 3 is: equal amount of chitin is used to replace tara tannin extract and yellow flag rhizome powder.
Comparative example 3
The only difference from preparation 3 is: equal amount of yellow calamus powder gum is adopted to replace tara tannin extract and chitin.
Comparative example 4
The only difference from preparation 3 is: equal amount of tara tannin extract is adopted to replace yellow calamus powder.
Comparative example 5
The only difference from preparation 3 is: equal amount of tara tannin extract is used to replace chitin.
Comparative example 6
The only difference from preparation 3 is: equal amount of chitin is used to replace tara tannin extract.
Comparative example 7
The only difference from preparation 3 is: the same amount of commercially available coagulant was used instead of the coagulant of preparation example 3.
TABLE 2
Examples
Example 1
The embodiment discloses an environment-friendly garden landscape rainwater treatment and recycling method, which comprises the following steps:
step 1), collecting rainwater: collecting rainwater within 15min from the beginning of raining into a treatment tank, and collecting rainwater 15min after the beginning of raining into a later-stage rainwater into a water storage tank;
step 2), treating initial rainwater: filtering initial rainwater through a 10mm grid, removing filtered slag on the grid, adding the coagulant prepared in preparation example 1, stirring at the stirring speed of 1.6r/s for 5min, standing for 0.4h, and then discharging into an SBR reactor to obtain purified water through automatic control system aeration, precipitation, drainage and idle denitrification;
step 3), rainwater recycling: pumping the purified water into the water storage tank by using a water suction pump, and irrigating the garden landscape after fully stirring the purified water and later-stage rainwater.
Examples 2 to 10
Embodiment 2-10 disclose an environment-friendly landscape rainwater treatment and reuse method, comprising the following steps:
step 1), collecting rainwater: collecting rainwater within 30min from the beginning of raining into a treatment tank, and collecting rainwater 30min after the beginning of raining into a later-stage rainwater into a water storage tank;
step 2), treating initial rainwater: filtering initial rainwater through a 15mm grid, removing filtered slag on the grid, adding a coagulant for stirring, wherein the addition amount of the coagulant is 0.15 percent of the total mass of the sewage, the stirring speed is 2.0r/s, stirring for 10min, standing for 0.6h, and then discharging into an SBR reactor to obtain purified water through automatic control system aeration, sedimentation, drainage and idle denitrification;
step 3), rainwater recycling: purified water is pumped into the water storage tank and is fully stirred with later-stage rainwater to water garden landscape.
The coagulants added in examples 2 to 10 were the coagulants prepared in preparation examples 2 to 10, respectively.
Example 11
The embodiment discloses an environment-friendly garden landscape rainwater treatment and recycling method, which is different from the embodiment 3 in that:
in the step 2), the coagulant, the tara tannin extract, the chitin, the propylene glycol alginate ester and the alkaline water with the pH value of 7 are sequentially added into a dispensing tank, the temperature of the alkaline water is 50 ℃, a stirrer is started to rotate at a speed of 260r/min, the stirring is carried out for 15min, and then the coagulant aid is added and the stirring is continued for 10 min.
Example 12
The embodiment discloses an environment-friendly garden landscape rainwater treatment and recycling method, which is different from the embodiment 10 only in that:
in the step 2), the coagulant, tara tannin extract, chitin, propylene glycol alginate and alkaline water with the pH of 7.8 are sequentially added into a dispensing tank, the temperature of the alkaline water is 55 ℃, a stirrer is started to rotate at the speed of 340r/min, the stirring is carried out for 20min, and then the coagulant aid is added and the stirring is continued for 15 min.
Example 13
The embodiment discloses an environment-friendly garden landscape rainwater treatment and recycling method, which is different from the embodiment 3 only in that:
in step 2) the addition of coagulant is eliminated.
Examples 14 to 20
The embodiment discloses an environment-friendly garden landscape rainwater treatment and recycling method, which is different from the embodiment 3 only in that:
the coagulants used in step 2) of examples 14 to 20 were the coagulants prepared in comparative examples 1 to 7, respectively.
Performance test
Test 1
Degradability test
In the medium-temperature anaerobic reaction device, the volume is 3m3Taking 50Kg of sludge treated with initial rainwater in examples 1-4 and 20, respectively adding the sludge into tanks No. 1, No. 2, No. 3, No. 4 and No. 5, sealing a feeding valve and a discharging valve after feeding is finished, leading out a piece of methane which is the same as exhaust gas, and after fermenting for 15 days, weighing the mass m1 of the undecomposed sludge, wherein the degradation rate is 1- (m1/50) × 100%.
TABLE 3
| m1/Kg | Percent of degradation/%) | |
| Example 1 | 4.5 | 91.0 |
| Example 2 | 4.3 | 91.4 |
| Example 3 | 4.1 | 91.8 |
| Example 4 | 4.4 | 91.2 |
| Example 20 | 14.5 | 71.0 |
According to the embodiment 20 in Table 3, compared with the embodiments 1-4, the degradation rate of the embodiments 1-4 is larger than that of the embodiment 20 under the same degradation time, the embodiments 1-4 are coagulants prepared by using tara extract, chitin and acorus calamus powder, and the embodiment 20 uses a commercial coagulant, which shows that the coagulants prepared by using the tara extract, the chitin and the acorus calamus powder are easier to degrade and more environment-friendly.
Test 2
Test of rainwater treatment ability
According to the national standard detection in table 4, the indexes of the regenerated rainwater treated in examples 1-20 are respectively tested, and the test results are detailed in table 5.
| Test items | National standard | Water quality standard for landscape water |
| Five days biochemical oxygen demand (BOD/5) | GB/T7488-1987 | ≤10mg/L |
| Suspended Substance (SS) | GB/T11901-1989 | ≤10mg/L |
| Anionic surfactants | GB/T7494-1987 | ≤0.5mg/L |
| Total nitrogen (in N) | GB/T11897-1989 | ≤15mg/L |
| Total phosphorus (in terms of P) | GB/T11893-1989 | ≤0.5mg/L |
| Number of fecal coliforms | HJ/T347-2007 | Less than or equal to 2000/L |
TABLE 5
Comparing the data of examples 14 and 15 with the data of example 13 in Table 5, it can be seen that the pollutant contents of examples 14 and 15 are less than the pollutant contents of example 13 in the water quality standard of landscape water, which indicates that the initial rainwater can be treated by adding tara extract or chitin alone but the water quality standard of landscape water is not reached, the pollutant contents of example 16 are substantially the same as that of example 13, and example 17 is less than that of examples 14 and 15, which indicates that the pollutant contents of water body of example 17 are inhibited by adding tara extract and chitin simultaneously, and the pollutant contents of water body of example 3 are much less than that of example 17 and less than the water quality standard of landscape water, which is seen by comparing the data of example 17 with that of example 3, the theory shows that only the tara tannin extract, the chitin and the acorus calamus powder are added at the same time, and are cooperated and matched in a specific proportion in initial rainwater, and the acorus calamus powder relieves the inhibiting effect between the tara tannin extract and the chitin in the aspect of treating the initial rainwater, so that the treatment capacity of the coagulant on the initial rainwater is greatly improved, and the rainwater is treated well, so that the coagulant is environment-friendly and has excellent water treatment capacity.
According to the comparison of the data of examples 5 and 6 and example 3 in table 5, the water body pollutant content of examples 5 and 6 is less than that of example 3, which shows that the treatment effect of aluminum sulfate and ferrous sulfate used as coagulant on the initial rainwater is better than that of ferric chloride, so that the treatment capacity of coagulant on the initial rainwater is further improved.
According to the comparison of the data of the examples 7 and 8 and the data of the example 3 in the table 5, the water body pollutant content of the examples 7 and 8 is less than that of the example 3, which shows that the treatment effect of the coal ash and the galactomannan used as the coagulant aid on the initial rainwater is better than that of the lime, so that the treatment capacity of the coagulant on the initial rainwater is further improved, and the water quality of garden landscape irrigation is further improved.
According to the comparison of the data of example 9 and example 3 in table 5, the water pollutant content of example 9 is less than that of example 3, which shows that the addition of propylene glycol alginate, which is cooperated with taraxacum extract, chitin and acorus calamus powder, increases the stability of flocs, makes the functional groups on bridges not easy to be separated from the surface of colloidal particles, and further improves the treatment capacity of the coagulant for initial rainwater.
As can be seen from comparison of the data in Table 5 in example 10 and example 9, the treated water in example 10 has a lower pollutant content than in example 9, indicating that propylene glycol alginate having a molecular weight of 10-20 ten thousand has a higher rainwater-treating ability than propylene glycol alginate having a molecular weight of 5-8 ten thousand, and that propylene glycol alginate is rapidly dispersed in initial rainwater and the stability of flocs formed is improved, thereby further improving the rainwater-treating ability.
According to the comparison of the data of the example 11 and the example 3 in table 5, the contents of the pollutants in the water body treated in the example 11 are all smaller than the contents of the pollutants in the example 3, which shows that the coagulant is not easy to agglomerate in the sewage and the coagulation of the pollutants is weakened by adding the alkali water dispersing coagulant, the tara extract, the chitin, the coagulant aid and the propylene glycol alginate into the sewage, the formed floc is more stable through more sufficient contact, the treatment capacity of the coagulant on the initial rainwater is improved, and the water quality of the initial rainwater is better.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (9)
1. An environment-friendly garden landscape rainwater treatment and recycling method is characterized by comprising the following steps:
step 1), collecting rainwater: collecting rainwater within 15-30min from the beginning of raining as initial rainwater, and collecting rainwater 15-30min after the beginning of raining as later rainwater;
step 2), treating initial rainwater: physically filtering and removing slag from initial rainwater, adding a coagulant for stirring, wherein the addition amount of the coagulant is 0.1-0.15% of the total mass of the sewage, the stirring speed is 1.6-2.0r/s, the stirring time is 5-10min, standing for 0.4-0.6h, and then aerating, precipitating, draining and performing idle denitrification to obtain purified water;
step 3), rainwater recycling: collecting the purified water into later-stage rainwater, fully stirring and irrigating the garden landscape;
the coagulant comprises the following components in parts by mass:
10-20 parts of a coagulant;
5-10 parts of tara tannin extract;
4-8 parts of chitin;
1-3 parts of yellow flag powder;
0.5-1.0 part of coagulant aid.
2. The environment-friendly landscape rainwater treatment and recycling method according to claim 1, characterized in that: the coagulant comprises the following components in parts by mass:
16-18 parts of a coagulant;
7.5-7.8 parts of tara tannin extract;
5.6-5.8 parts of chitin;
2.4-2.6 parts of yellow flag powder;
0.74-0.78 parts of coagulant aid.
3. The environment-friendly landscape architecture rainwater treatment and reuse method according to claim 1 or 2, characterized in that: the coagulant comprises aluminum sulfate and ferrous sulfate, wherein the mass ratio of the aluminum sulfate to the ferrous sulfate is 1: 2-4.
4. The environment-friendly landscape architecture rainwater treatment and reuse method according to claim 1 or 2, characterized in that: the coagulant aid comprises fly ash and galactomannan, wherein the mass ratio of the fly ash to the galactomannan is 1: 0.5-0.8.
5. The environment-friendly landscape architecture rainwater treatment and reuse method according to claim 1 or 2, characterized in that: the coagulant also comprises 0.32 to 0.48 weight portion of propylene glycol alginate.
6. The environment-friendly landscape rainwater treatment and reuse method according to claim 5, characterized in that: the molecular weight of the propylene glycol alginate is 5-30 ten thousand.
7. The environment-friendly landscape architecture rainwater treatment and reuse method according to claim 1 or 2, characterized in that: the coagulant feeding method comprises the following steps: adding the coagulant, tara tannin extract, chitin and propylene glycol alginate into alkaline water with pH of 7-7.8 sequentially at rotation speed of 260-.
8. The environment-friendly landscape rainwater treatment and reuse method according to claim 7, characterized in that: the temperature of the alkaline water is 50-55 ℃.
9. The environment-friendly landscape rainwater treatment and reuse method according to claim 7, characterized in that: when the coagulant is added, 0.32-0.48 part by mass of propylene glycol alginate and the coagulant are added into the alkaline water together.
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