CN106315987B - Multistage reinforced water self-cleaning and hydraulic regulation water quality purification treatment process and system - Google Patents
Multistage reinforced water self-cleaning and hydraulic regulation water quality purification treatment process and system Download PDFInfo
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- CN106315987B CN106315987B CN201610878815.9A CN201610878815A CN106315987B CN 106315987 B CN106315987 B CN 106315987B CN 201610878815 A CN201610878815 A CN 201610878815A CN 106315987 B CN106315987 B CN 106315987B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 199
- 238000000034 method Methods 0.000 title claims abstract description 23
- 230000008569 process Effects 0.000 title claims abstract description 20
- 238000004140 cleaning Methods 0.000 title claims abstract description 18
- 230000033228 biological regulation Effects 0.000 title claims abstract description 15
- 238000000746 purification Methods 0.000 title claims description 27
- 239000000701 coagulant Substances 0.000 claims abstract description 53
- 238000005273 aeration Methods 0.000 claims abstract description 21
- 238000005189 flocculation Methods 0.000 claims abstract description 21
- 230000016615 flocculation Effects 0.000 claims abstract description 21
- 239000013049 sediment Substances 0.000 claims abstract description 19
- 238000006243 chemical reaction Methods 0.000 claims abstract description 15
- 230000000694 effects Effects 0.000 claims abstract description 11
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 claims abstract description 5
- 238000005728 strengthening Methods 0.000 claims abstract description 5
- 229920000592 inorganic polymer Polymers 0.000 claims abstract description 4
- 229920002401 polyacrylamide Polymers 0.000 claims abstract description 4
- 150000003839 salts Chemical class 0.000 claims abstract description 4
- 230000014759 maintenance of location Effects 0.000 claims abstract description 3
- 238000004062 sedimentation Methods 0.000 claims description 12
- 241000196324 Embryophyta Species 0.000 claims description 9
- 230000001105 regulatory effect Effects 0.000 claims description 7
- 238000003860 storage Methods 0.000 claims description 7
- 238000009826 distribution Methods 0.000 claims description 5
- 238000002360 preparation method Methods 0.000 claims description 4
- 235000005273 Canna coccinea Nutrition 0.000 claims description 3
- 240000008555 Canna flaccida Species 0.000 claims description 3
- 241000721692 Lythrum Species 0.000 claims description 3
- 241000233948 Typha Species 0.000 claims description 3
- 230000015271 coagulation Effects 0.000 claims description 3
- 238000005345 coagulation Methods 0.000 claims description 3
- 230000006872 improvement Effects 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 229920011532 unplasticized polyvinyl chloride Polymers 0.000 claims description 3
- 244000205574 Acorus calamus Species 0.000 claims description 2
- 235000011996 Calamus deerratus Nutrition 0.000 claims description 2
- 230000000903 blocking effect Effects 0.000 abstract description 4
- 230000008901 benefit Effects 0.000 abstract description 3
- 238000010521 absorption reaction Methods 0.000 abstract 1
- 238000001556 precipitation Methods 0.000 description 9
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 8
- 230000008859 change Effects 0.000 description 8
- 229910052760 oxygen Inorganic materials 0.000 description 8
- 239000001301 oxygen Substances 0.000 description 8
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 5
- 229910052698 phosphorus Inorganic materials 0.000 description 5
- 239000011574 phosphorus Substances 0.000 description 5
- 239000004576 sand Substances 0.000 description 5
- 239000002245 particle Substances 0.000 description 4
- 238000010276 construction Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 230000037452 priming Effects 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 238000010926 purge Methods 0.000 description 2
- 102000010637 Aquaporins Human genes 0.000 description 1
- 241001365789 Oenanthe crocata Species 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000005276 aerator Methods 0.000 description 1
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- 230000009172 bursting Effects 0.000 description 1
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- 238000010586 diagram Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000003973 irrigation Methods 0.000 description 1
- 230000002262 irrigation Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000010907 mechanical stirring Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
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Classifications
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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
- C02F9/00—Multistage treatment of water, waste water or sewage
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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
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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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
- C02F2001/007—Processes including a sedimentation step
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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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/007—Contaminated open waterways, rivers, lakes or ponds
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/11—Turbidity
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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
- C02F3/32—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
- C02F3/327—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae characterised by animals and plants
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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
- C02F7/00—Aeration of stretches of water
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
A water quality purifying treatment process for multi-stage strengthening water self-cleaning and hydraulic regulation comprises the following steps: 1) Adding an aluminum salt or ferric salt inorganic polymer coagulant in front of a water diversion pump, wherein the adding amount is 5-30 ppm; 2) The flocculation reaction section is added with polyacrylamide coagulant aid, the addition amount is 0.01-0.1 ppm, and the bottom of the absorption tank area is provided with perforated pipes for aeration; 3) Planting amphibious plants along the land of the sediment river reach; 4) The tail end of the sediment water blocking section is provided with an ecological overflow gate to control the hydraulic retention time of the sediment water blocking section to be 90-120 min, the flow rate is less than 0.1m/s, and the difference between the flow rate and the downstream river water level is 30-50 cm; 5) A downstream throttle gate is arranged on a downstream river channel to control the water flow rate, so that a step-by-step water level difference is formed; 6) When there are several branches in downstream river, each branch is provided with a throttle. The invention also relates to a system special for the process. The technology and the system provided by the invention have the advantages that the effect is remarkable, the water diversion quality is purified with low cost, and the self-cleaning capability of the river water body is improved on the basis that the hydraulic engineering facilities and the river drainage function are not affected.
Description
Technical Field
The invention relates to a water quality purifying treatment process with multistage reinforced water self-cleaning and hydraulic regulation. The invention also relates to a water quality purifying treatment system which is specially used for the process and is used for multistage strengthening of water self-purification and hydraulic regulation.
Background
The urban river slope in the plain river network area is small, and in order to improve the fluidity of the river water body and increase the river water dynamics condition, the water distribution regulation and control are mainly carried out through the built water distribution pump station in the area range, so that the circulation speed of the river network water body in the area range is accelerated, the self-cleaning capacity of the water body is improved, the river network water environment is improved, and the harmonious and unified urban river landscape and living environment are constructed.
Taking the Shaoshi mountain area of Hangzhou city as an example, the current situation mainly leads the Qian Tangjiang river water into the river channel in the urban area through the small gravel mountain water diversion hub, the river side irrigation and drainage station, the Qian Tangjiang river coast water diversion hub pump stations such as the Qian Jiang Shuniu, and the like, so as to improve the river network water environment. At present, the annual water diversion amount in the Xiaoshan region is 9 hundred million m 3 Left and right. According to statistics of actual measurement suspended sand data of a Fuchun river power station, the average sand content of upstream of the Qianyangjiang is about 0.2kg/m 3 The average sand content of the downstream area is 0.4-2.0 kg/m 3 Especially, the sand delivery amount in the plum flood period accounts for 50-70% of the whole year. The water quality of the river outside the qian tangjiang river has large sand content, high turbidity and low water transparency, and the river channel in the inner river network area can be seriously deposited when the water is directly introduced into the inner river network area, and meanwhile, the water quality can not meet the requirements of the river channel landscape water body.
Conventional water purification treatment and known purification treatment facilities mainly treat water in closed structures or small devices, and water quantity and water quality can be homogenized by constructing structures or devices. However, in plain river network areas, in order to ensure the downstream water demand of river channels, water diversion facilities in hydraulic engineering have large water diversion quantity and complicated and changeable water diversion quality. For example, the diversion flow of the Hangzhou city money Jiang Shuniu is designed to be 20m 3 Per second, the theoretical water diversion amount per day is about 173 ten thousand m 3 S; the water in the outer river of the qian tangjiang river is influenced by tidal water, the turbidity reaches 2000NTU at maximum, 50NTU at minimum, and the water quality of the water body changes greatly. In the existing hydraulic engineering facilities such as a water diversion pump station, a homogenized structure is difficult to construct in space for unified treatment, and the construction is not economical. Therefore, in the plain river network area, how to combine the existing hydraulic engineering facilities such as the water diversion pump station and the urban river channel, the characteristics of large diversion water quantity and large water quality change are fully considered on the basis of not affecting the flood control and drainage functions, and the purification treatment of diversion water quality is a difficult point.
Disclosure of Invention
The first technical problem to be solved by the invention is to provide a water quality purifying treatment process with multistage reinforced water self-cleaning and hydraulic regulation.
The second technical problem to be solved by the invention is to provide a water quality purifying treatment system which is specially used for the multistage reinforced water self-cleaning and hydraulic regulation of the process.
The process and the system can be combined with the existing hydraulic engineering facilities such as the water diversion pump station, have remarkable effect, low cost and improve the self-cleaning capability of river water body on the basis of not influencing the drainage function of the hydraulic engineering facilities.
The first technical problem is solved, and the invention adopts the following technical scheme.
A multistage reinforced water self-cleaning and hydraulic regulation water quality purification treatment process is characterized by comprising the following steps:
1) Adding coagulant in proportion before a water diversion pump, wherein the coagulant is an aluminum salt or ferric salt inorganic polymer coagulant, and the adding amount of the coagulant is 5-30 ppm;
2) After the water body is discharged from the water diversion pump, the water body enters a pump station stilling pool for flocculation reaction, coagulant aid is added in a multi-point adding mode, the coagulant aid is polyacrylamide, and the adding amount is 0.01-0.1 ppm; installing perforated pipes at the bottom of a stilling pool area of a water outlet of the water diversion pump to perform blast aeration, so as to realize the turbulent flow effect of water flow in the stilling pool;
3) Planting amphibious plants along the coast of the sediment water-blocking section: canna, flowers of rehabilis, rhizoma alismatis, typha, calamus, lythrum, and rush emergent aquatic plants;
4) The water discharged from the stilling pool of the diversion pump station enters a sedimentation water-blocking section, ecological overflow gates capable of realizing different opening degrees are arranged at the tail ends of the sedimentation water-blocking section, the ecological overflow gates are synchronously regulated and controlled with diversion flow in the operation process, so that the hydraulic retention time of the sedimentation water-blocking section is controlled to be 90-120 min, the flow rate is less than 0.1m/s, the water level difference from the downstream river channel is 30-50 cm, and a water breaker is arranged at the overflow position of the gate roof;
5) The downstream river is provided with a downstream river throttle to control the water flow rate, so that a multi-stage water level difference is formed, and the flow rate is ensured to be more than 0.1m/s;
6) When a plurality of branches are split in a downstream river, the flow distribution ratio of each branch is controlled by adjusting the opening of a throttle valve of each branch, the flow velocity of each branch in the downstream river is controlled, the water level difference is formed, the flow velocity is ensured to be more than 0.1m/s, and the hydrodynamic condition improvement of all the river is realized.
The ecological overflow gate at the tail end of the sediment water-blocking section is erected to block water during normal diversion purification treatment, so that the water level difference before and after the ecological overflow gate is formed; when flood discharge, the horizontal gate discharges waterlogging and water. The ecological overflow gate can realize different opening degree control water levels, and the ecological overflow gate and the diversion flow are synchronously regulated and controlled in the running process. The water breaker is arranged at the overflow position of the gate top to form a large number of microporous bubbles, so that the dissolved oxygen content in the water body is improved, and the ecological environment of the river water body is improved.
The second technical problem is solved, and the invention adopts the following technical scheme.
The system is suitable for hydraulic engineering facilities of a diversion pump station and urban river channels, and a suitable purification treatment area comprises a diversion section, a flocculation reaction section, a precipitation water-blocking section, an ecological overflow gate, an ecological reoxygenation area and a downstream river channel which are sequentially connected with each other and are provided with a diversion pump water inlet; the method is characterized in that: the system comprises:
the hydraulic coagulation system consists of a coagulant storage system and a coagulant adding system, wherein the coagulant in the coagulant storage system is pumped to a water inlet of the water diversion pump by the adding system;
the aeration strengthening flocculation system comprises a coagulant aid preparation system and a coagulant aid adding system, wherein the coagulant aid is added to the water inlet side of the pump station stilling pool in a multipoint adding mode through the coagulant aid adding system; the flocculation reaction section also comprises a plurality of concurrent and parallel aeration perforated pipes arranged at the bottom of the flocculation reaction section, all the aeration perforated pipes are transversely connected from the middle through a main pipe, the main pipe adopts stainless steel pipes with de of 100-400, the aeration perforated pipes adopt UPVC pipes with DN of 50-250, two sides of the central symmetry plane of the aeration perforated pipes are perforated on the wall at the position of 45 degrees downwards from the center of the circle, and the aperture is 4-8 mm;
the unpowered ecological reoxygenation system comprises a flood plain ecological system formed by aquatic plants along the bank of the sedimentary water-blocking section river course and an ecological overflow gate at the tail end of the sedimentary water-blocking section;
the downstream river hydraulic regulation system comprises downstream river throttle gates arranged in each downstream river.
The innovation of the invention is that: 1) The water diversion pump station engineering facility layout is combined, so that the flood control and drainage functions of the pump station are not affected; 2) Optimizing the adding position and the adding proportion of the coagulant and the coagulant aid, and realizing the optimality of the adding effect and the economical treatment; 3) Because the stilling pool is an important water passage when the pump station drains the waterlogging, the water passing capacity during the waterlogging in the flood season can be influenced by the speed gradient required by maintaining the flocculation reaction by means of mechanical stirring or conventional folded plate facilities, and the water flow rate is high during the waterlogging in the flood season, so that the destructive influence is easily caused on the mechanical or folded plate facilities. In view of the above, the invention increases the turbulence degree of the water body in the stilling pool, increases the collision chance of particles and improves the flocculation effect by arranging the perforated pipe aeration facility at the bottom of the stilling pool of the diversion pumping station on the basis of not influencing the waterlogging drainage function; 4) An ecological overflow gate is arranged at the tail end of downstream river sediment, water blocking of a sediment section is realized, the flow velocity of water is slowed down, flocculated particles are effectively settled, turbidity is reduced, water transparency is improved, and meanwhile phosphorus is removed. Under the condition that the condition allows, the sediment section of the river reach can also form a flood land for water and land connection, and the biodiversity of the river is effectively improved by planting amphibious emergent aquatic plants. Meanwhile, the drop water formed by the ecological overflow gate and a large amount of micropore bubbles formed by the gate bursting water breaker are skillfully combined, so that the dissolved oxygen content in the river water body is improved and the ecological environment of the river water body is improved under the condition that new power is not required to be added; 5) The opening of the ecological overflow gate is regulated and controlled in real time according to the diversion flow, so that when different diversion flows are realized, the water-blocking sections of the river channel are controlled at different water levels, and the sedimentation effect is ensured; 6) The water quality of the river water body downstream of the ecological overflow gate can form multistage water level difference by arranging a throttle gate, so that the hydrodynamic condition of the river water body is improved, the fluidity of the river water body is increased, and the self-cleaning capacity of the water body is improved.
The invention has the beneficial effects that: 1) The turbidity and the total phosphorus content in the water body can be effectively reduced, the transparency and the dissolved oxygen content of the water body are obviously improved, the ecological environment of the river water body is obviously improved, the self-cleaning capacity of the river water body is improved, and the ecological environment benefit is obvious; 2) After the purification treatment, sediment accumulation in the downstream river can be effectively avoided, huge engineering cost caused by dredging the downstream river is saved, and economic benefit is remarkable.
Drawings
FIG. 1 is a schematic illustration of a treatment system suitable for use in a downstream sediment section without diversion;
FIG. 2 is a schematic diagram of a treatment system suitable for diverting a downstream sediment volume;
FIG. 3 is a bottom view of a perforated tube;
FIG. 4 is a schematic cross-sectional view of a perforated tube;
FIG. 5 shows turbidity changes before and after the purification treatment;
FIG. 6 shows the total phosphorus change before and after the purge treatment;
FIG. 7 shows DO variation before and after purging;
fig. 8 shows the change in transparency before and after the purification treatment.
In the figure, (1) -coagulant storage system; (2) -a coagulant addition system; (3) -a priming pump water inlet; (4) -a priming pump unit; (5) a coagulant aid preparation system; (6) coagulant aid adding system; (7) adding coagulant aid at multiple points; (8) a blast aeration facility; (9) aeration perforated pipe; a sediment water-blocking section;an ecological overcurrent gate; />An ecological reoxygenation area; />A downstream waterway; />Downstream river channel throttle.
Detailed Description
Referring to fig. 1 and 2, the multistage reinforced water self-cleaning and hydraulic regulation water quality purification treatment process of the invention is characterized by comprising the following steps:
1) Analyzing the change condition of raw water quality, finding a change rule of raw water quality, and avoiding a time period in which extremely adverse water diversion is carried out, such as a period which is influenced by flood tide or other water quality greatly, in order to improve the economy of purification treatment; the purification treatment time period is arranged as much as possible: the turbidity of the water diversion quality is not more than 500NTU, and the salinity is not more than 250ppm. If the turbidity exceeds 500NTU, water is guided, and the treatment cost is high. If the salinity exceeds 250ppm, the downstream river ecosystem is considered, and diversion is not recommended.
2) The coagulant is added in proportion before the water diversion pump, the coagulant is inorganic high molecular coagulant of aluminum salt or ferric salt, and the adding amount of the coagulant is 5-30 ppm. At the inlet of the water diversion pump, the rapid and uniform mixing of the coagulant and the water body is realized by the high-speed rotation of the impeller of the water diversion pump.
3) The water body is led out by the water diversion pump, enters the pump station stilling pool for flocculation reaction, and the coagulant aid is added in proportion in a multi-point adding mode. The coagulant aid is polyacrylamide, and the adding amount is 0.01-0.1 ppm. In order to enhance the turbulence degree of the water body and improve the flocculation effect of the water body, a perforated pipe is arranged at the bottom of the stilling pool area of the water outlet of the water diversion pump for aeration, and the aeration is carried out by a blast aerator, so that the turbulence effect of water flow in the stilling pool is realized, the water body in the stilling pool is ensured to reach enough turbulence degree, the speed gradient required by flocculation reaction is maintained, and the collision opportunity of floccule particles is increased. And meanwhile, the phenomenon that the water logging is affected due to the fact that the flocs settle down due to slow flow velocity in a local area can be avoided. The implementation of aeration also facilitates the removal of pollutants from the body of water due to the increased oxygen content in the body of water.
4) The water flowing out from the stilling pool of the diversion pumping station enters a downstream river, and the ecological overflow gate is arranged at the sedimentation tail end of the inner river, so that water blocking of the sedimentation section is realized. Amphibious plants such as canna, flowers of Reili, rhizoma alismatis, typha, chang, lythrum, rush and the like are planted along the land of the sediment river reach, so that flood lands rich in biodiversity are formed during water diversion purification treatment, and pollutants in the water body can be further reduced through adsorption, filtration or interception.
5) In order to ensure the particle precipitation effect of the precipitation section, the flow velocity of the precipitation water-blocking section is less than 0.1m/s, the difference between the flow velocity of the precipitation water-blocking section and the water level of a downstream river channel is 30-50 cm, and a water head difference formed by a sluice creates a drop and reoxygenation environment. The gate top overflow part is provided with the water breaker, so that a large number of microporous bubbles are generated in the overflow water body, no new power is needed, the dissolved oxygen content in the river water body is improved, and the ecological environment of the river water body is greatly improved.
6) The flow speed of the downstream river channel water body is controlled by a downstream sluice, a multi-stage water level difference is formed, the flow speed is ensured to be more than 0.1m/s, and the self-cleaning capacity of the river channel water body is improved by improving the hydrodynamic condition.
7) When a plurality of branches are split in a downstream river, the flow distribution ratio of each branch is controlled by adjusting the opening of a throttle valve of each branch, the flow velocity of each branch in the downstream river is controlled, the water level difference is formed, the flow velocity is ensured to be more than 0.1m/s, and the improvement of the hydrodynamic conditions of all the river is realized.
The system is suitable for hydraulic engineering facilities of a diversion pump station and urban river channels, and the purification treatment area comprises a diversion section provided with a water inlet of the diversion pump, a pump station stilling pool section (flocculation reaction section), a sedimentation water-blocking section, an ecological reoxygenation section formed by a sedimentation tail end sluice and a downstream river channel section which are sequentially connected; the method is characterized in that: the system comprises:
the hydraulic coagulation system consists of a coagulant storage system 1 and a feeding system 2, wherein coagulant in the storage system is fed to a water inlet 3 of a water diversion pump through the feeding system 2.
The aeration strengthening flocculation system comprises a coagulant aid preparation system 5 and a feeding system 6, and is fed to the water inlet side 7 of the pump station stilling pool in a multipoint feeding mode through the coagulant aid feeding system 6; the flocculation reaction section also comprises a plurality of concurrent and parallel perforated pipes which are arranged in the flocculation reaction section, each perforated pipe is transversely connected from the middle through a main pipe, the main pipe adopts stainless steel pipes with de of 100-400, the perforated pipes adopt UPVC pipes with DN of 50-250, two sides of the central symmetry plane of the perforated pipes are perforated on the wall at the position of 45 degrees downwards from the center of the circle, and the aperture is 4-8 mm.
The unpowered ecological reoxygenation system comprises a flood land ecological system arrangement formed by aquatic plants along the bank of the precipitation section river channel and reoxygenation water body river sections formed by ecological overflow gates 11 at the tail ends of the precipitation. During normal diversion purification treatment, the ecological overflow gate is erected to block water to form a water level difference before and after the sluice; when flood discharge, the horizontal gate discharges waterlogging and water. The ecological overflow gate can realize different opening degree control water levels, and the ecological overflow gate and the diversion flow are synchronously regulated and controlled in the running process. The water breaker is arranged at the overflow position of the gate top to form a large number of microporous bubbles, so that the dissolved oxygen content in the water body is improved, and the ecological environment of the river water body is improved.
The downstream river hydraulic regulation system comprises a downstream river and a throttle gate of each tributary. The water level of each downstream river channel is controlled through the downstream throttle gate to form multi-stage water level difference, the flow speed is ensured to be larger than 0.1m/s, and the self-cleaning capacity of the river channel water body is improved through improving the hydrodynamic condition.
Specific application example
The engineering implementation case is carried out in Qianjiang junction in Shore areas of Hangzhou. The Qianjiang junction is provided with two diversion pumps, and the diversion flow of a single diversion pump is 10m 3 And/s. During the construction implementation, the coagulant is added at the inlet of the water diversion pump, and the coagulant and the water outside the Qian pond river are fully mixed in the process of entering the water diversion pump. The coagulant is added as aluminum salt inorganic polymer coagulant, the adding amount is adjusted according to the water quality condition of the external river of the Qian pond river, and the adding amount is 5-30 ppm. Then, coagulant aid is added into the stilling pool in a multipoint adding mode, the adding amount is 0.01-0.1 ppm, and sufficient turbulence effect is created through aeration of perforated pipes in the stilling pool, so that the speed gradient required by flocculation is maintained. And finally, completing a precipitation process by utilizing the partial river segment of the released river after the downstream river, and enabling the length of the released river precipitation river to be 500m.
The tail end of the sediment of the released river is constructed with an ecological overflow sluice, the sluice has 3 holes, the net width is 36m, and the maximum overflow sluice flow is 110m 3 And/s, adopting a lower horizontal ecological overflow gate. The water level of the sediment water-blocking section is regulated and controlled to be 4.8m through the ecological overflow gate at the tail end of the sediment, and the water level of a river channel behind the gate is controlled through a downstream throttle gateAt 4.3m, the water level difference of 50cm is kept before and after the sluice, and the environment of water fall and reoxygenation is created. Meanwhile, the water breaker arranged at the top of the sluice gate forms a large number of microporous bubbles, so that the dissolved oxygen content of the water body is improved. After the purification treatment, the transparency of the effluent at the sluice at the tail end of the sediment exceeds 1m, the turbidity removal rate exceeds 90%, the total phosphorus removal rate exceeds 80%, and the dissolved oxygen content of the water body is obviously improved. The flow speed and the water level of each branch of the downstream river are controlled by each throttle, the hydrodynamic condition of the river is obviously improved, and the water quality can be maintained for a long time.
Table 1 below shows the turbidity change conditions before and after the purification treatment.
Table 2 below shows the total phosphorus change before and after the purification treatment
Table 3 below shows DO variation before and after the purification treatment
Table 4 below shows the transparency change before and after the purification treatment.
Claims (3)
1. A multistage reinforced water self-cleaning and hydraulic regulation water quality purification treatment process is characterized by comprising the following steps:
1) Adding a coagulant in proportion before a water diversion pump, wherein the coagulant is an aluminum salt or ferric salt inorganic polymer coagulant, and the adding amount of the coagulant is 5-30 ppm;
2) After the water body is discharged from the water diversion pump, the water body enters a pump station stilling pool for flocculation reaction, coagulant aid is added in a multi-point adding mode, the coagulant aid is polyacrylamide, and the adding amount is 0.01-0.1 ppm; installing perforated pipes at the bottom of a stilling pool area of a water outlet of the water diversion pump to perform blast aeration, so as to realize the turbulent flow effect of water flow in the stilling pool;
3) Planting amphibious plants along the coast of the sediment water-blocking section: canna, flowers of rehabilis, rhizoma alismatis, typha, calamus, lythrum, and rush emergent aquatic plants;
4) The water discharged from the stilling pool of the diversion pump station enters a sedimentation water-blocking section, ecological overflow gates capable of realizing different opening degrees are arranged at the tail ends of the sedimentation water-blocking section, the ecological overflow gates and the diversion flow are synchronously regulated and controlled in the operation process, so that the hydraulic retention time of the sedimentation water-blocking section is controlled to be 90-120 min, the flow rate is less than 0.1m/s, the water level difference from the downstream river channel is 30-50 cm, and a water breaker is arranged at the overflow position of the gate roof;
5) The downstream river is provided with a downstream river throttle to control the water flow rate, so that a multi-stage water level difference is formed, and the flow rate is ensured to be more than 0.1m/s;
6) When a plurality of branches are split in a downstream river, the flow distribution ratio of each branch is controlled by adjusting the opening of a throttle valve of each branch, the flow velocity of each branch in the downstream river is controlled, the water level difference is formed, the flow velocity is ensured to be more than 0.1m/s, and the hydrodynamic condition improvement of all the river is realized.
2. The multistage intensified water self-cleaning and hydraulically regulated water quality purifying treatment process according to claim 1, characterized in that: the ecological overflow gate at the tail end of the sediment water-blocking section is erected to block water during normal diversion purification treatment, so that the water level difference before and after the ecological overflow gate is formed; when flood discharge, the horizontal gate discharges waterlogging and water.
3. A water quality purification treatment system specially used for multistage enhanced water self-cleaning and hydraulic regulation of the process as claimed in claim 1 or 2, wherein the system is suitable for hydraulic engineering facilities of a diversion pump station and urban river channels, and a purification treatment area suitable for the system comprises a diversion section provided with a water inlet of a diversion pump, a flocculation reaction section comprising a pump station stilling pool section, a sedimentation water-blocking section, an ecological overflow gate, an ecological reoxygenation area and a downstream river channel which are sequentially connected; the method is characterized in that: the system comprises:
the hydraulic coagulation system consists of a coagulant storage system and a coagulant adding system, wherein the coagulant in the coagulant storage system is pumped to a water inlet of the water diversion pump by the adding system;
the aeration strengthening flocculation system comprises a coagulant aid preparation system and a coagulant aid adding system, wherein the coagulant aid is added to the water inlet side of the pump station stilling pool in a multipoint adding mode through the coagulant aid adding system; the flocculation reaction section also comprises a plurality of concurrent and parallel aeration perforated pipes arranged at the bottom of the flocculation reaction section, all the aeration perforated pipes are transversely connected from the middle through a main pipe, the main pipe adopts a stainless steel pipe with de of 100-400, the aeration perforated pipes adopt UPVC pipes with DN of 50-250, two sides of the central symmetry plane of the aeration perforated pipes are perforated on the wall at the position of 45 degrees downwards from the center of the circle, and the aperture is 4-8 mm;
the unpowered ecological reoxygenation system comprises a flood plain ecological system formed by aquatic plants along the bank of the sedimentary water-blocking section river course and an ecological overflow gate at the tail end of the sedimentary water-blocking section;
the downstream river hydraulic regulation system comprises downstream river throttle gates arranged in each downstream river.
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| CN111423053A (en) * | 2020-03-15 | 2020-07-17 | 河海大学 | In-situ treatment method of river black and odorous water body based on modified plant tannin |
| CN113087171B (en) * | 2020-07-29 | 2023-04-07 | 浙江海洋大学 | Using method of riverway water quality improving device |
| CN113929266A (en) * | 2021-10-30 | 2022-01-14 | 中冶华天工程技术有限公司 | Duantou creek river channel water quality improving method and system |
| CN115745042B (en) * | 2022-11-23 | 2023-09-15 | 呼伦贝尔健城环保科技有限公司 | Environment-friendly energy-saving treatment system for urban sewage |
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