CN101708387B - Method for dynamically backwashing dirt separator by using continuous flow - Google Patents
Method for dynamically backwashing dirt separator by using continuous flow Download PDFInfo
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- CN101708387B CN101708387B CN200910264662A CN200910264662A CN101708387B CN 101708387 B CN101708387 B CN 101708387B CN 200910264662 A CN200910264662 A CN 200910264662A CN 200910264662 A CN200910264662 A CN 200910264662A CN 101708387 B CN101708387 B CN 101708387B
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Abstract
The invention relates to a method for dynamically backwashing a dirt separator by using continuous flow, which mainly comprises the following steps of: leading the discharge water of a depositing pool to automatically enter the dirt separator by a pipeline and uniformly distributing water on the plane of a material filtering layer by the functions of a water distributing device and a tapered reflecting plate; in the running process of the dirt separator, continuously lifting sand in a conical hopper at the bottom of the dirt separator by the gas auxiliary function; and after the rubbing and washing are finished at a center pipe, enabling the sand to enter an upper expanding area for releasing the kinetic energy and reducing the flow rate. The sand and water separation is realized by the control on the flow speed of all points due to flow speed change and specific gravity difference, the sand is deposited, and impurities are discharged out of the dirt separator along with the water flow. When the sand descends in a corrugated pipe, the clear water reversely flows across the sand under the action of a static pressure difference to wash a filter material again, thereby ensuring the dynamic backwashing effect of the filter material.
Description
Technical field
The invention belongs to the water purification technology field; Relate to the dynamic back-washing method continuously of realizing under the shut down condition not to dirt separator, especially filtering dirt separator; To keep the dirt separator filler in running order forever, reduce the required corollary equipment of filler regeneration and the impact load of system in a large number.
Background technology
In the water purification process, suspension and turbidity are two key indexs, generally adopt coagulation+filtering technique to remove these two pollution factors, and the filler of filter is taken as the leading factor with sand grains, fiber basically.The method of operation mostly is intermitten service, and every operation one-period needs the stoppage in transit backwash, to remove the impurity that filtrate is held back, prevents that saturated aquifer yield reduction, energy consumption increase even the pollution factor of causing of filtrate from penetrating filtering layer, influences system processing power and water quality.
Owing to there is backwash process; Need supporting backwash pump, air blast, the flushing water retracting device of being provided with, not only increased construction investment volume and production cost, and increased the production management difficulty; The backwash draining must be got back to system and handle, has increased the hydraulic load of system.According to the scale of handling the water yield, the backwash water consumption is generally 6～10% of disposal ability, backwash power consumption 0.002～0.0025kW.h/ ton water.
If can improve, not only can reducing the construction costs and operation energy consumption, and can improve the utilization rate of purifier this traditional filtering technology.
Summary of the invention
The objective of the invention is to propose the method that a kind of dynamically backwashing dirt separator by using continuous flow especially filters dirt separator, clean, improve the utilization rate of device, and reduce the backwash energy consumption in order to make filter under the situation of not stopping transport, accomplish filtrate.
Technical scheme of the present invention is: the method for dynamically backwashing dirt separator by using continuous flow; Comprise the steps: 1, in the dirt separator water-locator through the downward water distribution of radial water-locator; Especially adopt radial water distributor and tapered baffle plate to combine; Tapered baffle plate is in the outer rim of radial water distributor, realizes water distribution uniformity, water distribution after conical baffled reflection through the filter material layer of filter; 2, in the dirt separator running, through the dirt separator bottom gas-feeding, promptly through the gas booster action, circularly enhancing and clean filtrate in current, filtrate the central tube of dirt separator accomplish clean after, get into the extended area on top, discharge kinetic energy, reduce flow velocity; 3, in the predetermined processing limit of power, confirm radial water distributor, each discharge area of central tube through designing, make flow velocity be in reasonable zone; When current during through each section; Under the acting in conjunction of change in flow and difference of specific gravity, realize the sand separated form water, sand grains sinks; Impurity is discharged dirt separator with current, reaches the purpose of filtrate continuous wash with this; 4, water velocity 1.5～2.5m/s in the control of each point flow parameters, central tube, jet air velocity 2～4m/s; Central tube import and the flow velocity 0.1～0.2m/s of place, stack shell slit; Expansion area flow velocity 3～5cm/s, ripple velocity in pipes 0.1-0.2m/s, flow 0.5-1.0L/s.
The invention has the beneficial effects as follows: need not the supporting equipment such as backwash pump, backwash blower fan that are provided with, need not to increase the dischargeable capacity of collecting-tank, can be to system's load that impacts, and reduce operating cost.Through realizing the dynamically backwash continuously of the little water yield, keep filtrate to be in clean conditions, not only reduced construction investment cost and operating cost, improved traditional filtering technology simultaneously and produced the influence that impact load causes system because of the recoil draining.The present invention is actually the method for dynamic filtration, makes the dirt separator filter under the situation of not stopping transport, accomplish filtrate and cleans, and improves the utilization rate of device.
Description of drawings
Fig. 1 is the dirt separator structural representation that the present invention uses
The specific embodiment
1) under air, promotes filtrate continuously, and in central tube, accomplish filtrate and clean process.
Put forward mode through gas, awl bucket suction filtrate gets into central tube from the bottom continuously, and the sand water mixed liquid rises in the drive central tube, and the filter course filtrate is located continuous supplementation to the awl bucket through central tube and stack shell slit simultaneously.The central tube diameter is DN32～DN65, and in-pipe flow speed is 1.5～2.5m/s, and air velocity is 2～4m/s, and central tube import and place, stack shell slit flow velocity are 0.1～0.2m/s.Referring to Fig. 1 dirt separator.
2) the sand separated form water is accomplished for the expansion area in the central tube top, improves the dirt separator capacity utilization.
After gas, aqueous medium get into the expansion area, top in the central tube, discharge kinetic energy, flow velocity reduces, and the filtrate that proportion is bigger gets into filtering layer after being deposited to the recirculating zone, and the impurity that filtrate is held back gets into the discharge region on top with current.The expansion area flow velocity is 3～5cm/s around the central tube top, and draining crest of weir flow velocity is 0.1～0.3m/s.
3) backwash Disengagement zone (being the expansion area, top) isolates with filtering area, realizes the subregion water outlet.
Ring bellows is arranged on central tube top, bellows and bottom, backwash draining weir welded seal.The flow velocity of backwash draining (groove) is 0.6m/s, and the drainpipe flow velocity is 0.7-1.5m/s, and clear water effluent weir headwater depth is 0.05-0.15m.
4) the reverse cleaning of the continuous little water yield is cleaned filtrate, despumation.
When filtrate descended in bellows, under clear water zone head static pressure, the part clear water was reverse upper reaches, further cleans filtrate, carried impurity and discharged dirt separator.Ripple velocity in pipes 0.1-0.2m/s, flow 0.5-1.0L/s, clear water zone and backwash catchment net-head are 20-50cm.
The process of handling is following: the sedimentation basin water outlet gets into dirt separator through pipeline self, through the downward water distribution of radial water-locator, through conical baffled reflection after filter the bed of material; And suitably reduce the packing of boring filtrate in the bucket, be convenient to the central tube that filtrate gets into dirt separator; The downward water distribution of water distributor upwards is evenly distributed to whole plane behind tapered baffle reflection, the awl of tapered baffle plate struggles against into 60 ° of angles;
After dirt separator is full of water, start air blast continuously from bottom gas-feeding, circularly enhancing also cleans filtrate; Continuously dirt separator bottom awl bucket filtrate is promoted;
After the sand aqueous mixtures got into the expansion area, top in the central tube, because enlarged areas, flow velocity reduced, because difference of specific gravity, sand grains sinks, and water carries impurity and gets into drainage ditch;
In the decline process, because the clear water zone liquid level is higher than backwash catchment liquid level, under hydrostatic pressure, the part clear water gets into from the bellows lower end sand grains, with sinking sand grains antikinesis, further cleans filtrate in bellows;
Filter back clear water and backwash sewer are respectively through effluxing after the water leg collection separately.
Dirt separator stack shell diameter 3.6m, stack shell height overall 4.2m.Central tube diameter 32mm, waterpower flow velocity are 2m/s, expansion area diameter 200mm, and vertical waterpower flow velocity 4cm/s, bellows diameter 55mm, waterpower flow velocity 0.1m/s, the gap is 8cm between backwash draining weir and the bellows, auxiliary water ratio is 10.8%.The air blast flow-control is at 0.14m
3Operation continuously about/min.
Device moves 30 days continuously, and installing total power consumption variable is 93.2kW.h, and the conversion average current drain is a 0.0013kW.h/ ton water.
Under the situation of influent turbidity≤5NTU, delivery turbidity mean value is 0.43NTU, satisfies " drinking water sanitary standard " (GB5749-2006) requirement fully.After the off-test, filtrate is carried out sample examination, the filtrate clay content is 0.42%, explains that the dynamic cleaning performance of filtrate is good.
Dirt separator stack shell diameter 3.6m, stack shell height overall 4.2m.Central tube diameter 40mm, waterpower flow velocity are 1.5m/s, expansion area diameter 300mm, and vertical waterpower flow velocity 3cm/s, bellows diameter 60mm, waterpower flow velocity 0.1m/s, the gap is 8cm between backwash draining weir and the bellows, auxiliary water ratio is 7.3%.The air blast flow-control is at 0.23m
3Operation continuously about/min.
Device moves 30 days continuously, and installing total power consumption variable is 153.0kW.h, and the conversion average current drain is a 0.0021kW.h/ ton water.
Under the situation of influent turbidity≤5NTU, delivery turbidity mean value is 0.49NTU, satisfies " drinking water sanitary standard " (GB5749-2006) requirement fully.After the off-test, filtrate is carried out sample examination, the filtrate clay content is 0.23%, explains that the dynamic cleaning performance of filtrate is good.
Stack shell diameter 3.6m, stack shell height overall 4.2m.Central tube diameter 32mm, waterpower flow velocity are 2.5m/s, expansion area diameter 200mm, and vertical waterpower flow velocity 5cm/s, bellows diameter 50mm, waterpower flow velocity 0.2m/s, the gap is 8cm between backwash draining weir and the bellows, auxiliary water ratio is 7.8%.The air blast flow-control is at 0.19m
3Operation continuously about/min.
Device moves 30 days continuously, and installing total power consumption variable is 126.4kW.h, and the conversion average current drain is a 0.0018kW.h/ ton water.
Under the situation of influent turbidity≤5NTU, delivery turbidity mean value is 0.47NTU, satisfies " drinking water sanitary standard " (GB5749-2006) requirement fully.After the off-test, filtrate is carried out sample examination, the filtrate clay content is 0.37%, explains that the dynamic cleaning performance of filtrate is good.
Can know by embodiment; Dynamically backwashing dirt separator by using continuous flow technology disclosed by the invention is effective; Can be implemented in preferably and realize under the not stoppage in transit situation that filtrate cleans, stable effluent quality, the filtrate cleaning performance is good; Compare with the power consumption of conventional filter tank operation, average current drain can reduce about 13%.The large-scale promotion of present technique is used, and is significant.
Claims (4)
1. the method for dynamically backwashing dirt separator by using continuous flow comprises the steps: 1), water-locator is realized water distribution uniformity through the downward water distribution of radial water-locator in the dirt separator, water distribution after conical baffled reflection through the filter material layer of filter; Ring bellows is arranged on central tube top, bellows and bottom, backwash draining weir welded seal; 2), in the dirt separator running, through the dirt separator bottom gas-feeding, promptly through the gas booster action, circularly enhancing and clean filtrate in current, filtrate the central tube of dirt separator accomplish clean after, get into the extended area on top, discharge kinetic energy, reduce flow velocity; 3), in the predetermined processing limit of power, confirm radial water distributor, each discharge area of central tube, make flow velocity be in reasonable zone; When current during through each section; Under the acting in conjunction of change in flow and difference of specific gravity, realize the sand separated form water, sand grains sinks; Impurity is discharged dirt separator with current, reaches the filtrate continuous wash with this; Water velocity 1.5～2.5m/s in the control of each point flow parameters, the central tube of dirt separator, air velocity 2～4m/s; Central tube import and the flow velocity 0.1～0.2m/s of place, dirt separator stack shell slit; Expansion area flow velocity 3～5cm/s, ripple velocity in pipes 0.1-0.2m/s, flow 0.5-1.0L/s; Under air, promote filtrate continuously; And in central tube, accomplish filtrate and clean process: put forward mode through gas; Awl bucket suction filtrate gets into central tube from the bottom continuously; And the sand water mixed liquid rises in the drive central tube, and the filter course filtrate is located continuous supplementation to the awl bucket through central tube and stack shell slit simultaneously; Backwash rhone flow velocity is 0.6m/s, and the drainpipe flow velocity is 0.7-1.5m/s, and the draining crest of weir flow velocity that dirt separator top is provided with is 0.1～0.3m/s, and clear water effluent weir headwater depth is 0.05-0.15m; After gas, aqueous medium get into the expansion area, top in the central tube, discharge kinetic energy, flow velocity reduces, and the filtrate that proportion is bigger gets into filtering layer after being deposited to the recirculating zone, and the impurity that filtrate is held back gets into the discharging on top with current; When filtrate descended in bellows, under clear water zone head static pressure, the part clear water was reverse upper reaches, further cleans filtrate, carried impurity and discharged dirt separator, and clear water zone and backwash catchment net-head are 20-50cm.
2. the method for dynamically backwashing dirt separator by using continuous flow according to claim 1 is characterized in that expansion area, central tube top completion sand separated form water, improves the dirt separator capacity utilization.
3. the method for dynamically backwashing dirt separator by using continuous flow according to claim 1 is characterized in that expansion area, central tube top flow velocity is 3～5cm/s.
4. the method for dynamically backwashing dirt separator by using continuous flow according to claim 1 is characterized in that the isolation of backwash Disengagement zone and filtering area, realizes the subregion water outlet.
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102001751B (en) * | 2010-12-22 | 2012-07-25 | 中冶赛迪工程技术股份有限公司 | Continuous backwashing aeration biofilter |
| CN102949868B (en) * | 2011-08-22 | 2014-10-22 | 陈学明 | Rapid sewage purifying machine |
| CN105016462B (en) * | 2015-07-07 | 2017-05-03 | 中国石油天然气集团公司 | Biological aerated filter for automatically and continuously cleaning filter materials |
| CN106430517A (en) * | 2016-08-30 | 2017-02-22 | 无锡市新都环保科技有限公司 | Oxidization mixing reaction device for wastewater treatment |
| CN109795885B (en) * | 2019-03-22 | 2024-03-22 | 杭州回水科技股份有限公司 | Pneumatic conveying device with protective sleeve and use method thereof |
| CN114199715B (en) * | 2021-12-09 | 2023-01-24 | 国投信开水环境投资有限公司 | Continuous sewage sand content acquisition device and test method |
| CN117959781B (en) * | 2024-04-01 | 2024-05-28 | 兴泰建设集团有限公司 | V-filter workshop construction method for water flow treatment |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200966944Y (en) * | 2006-06-29 | 2007-10-31 | 长沙高新开发区美源环保科技有限公司 | Moving sand filter |
| CN201253505Y (en) * | 2008-09-01 | 2009-06-10 | 帕克环保技术(上海)有限公司 | Gas-stripping type continuous sand filtering device |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200966944Y (en) * | 2006-06-29 | 2007-10-31 | 长沙高新开发区美源环保科技有限公司 | Moving sand filter |
| CN201253505Y (en) * | 2008-09-01 | 2009-06-10 | 帕克环保技术(上海)有限公司 | Gas-stripping type continuous sand filtering device |
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Address after: No.23, Liuzhou North Road, Jiangbei new district, Nanjing, Jiangsu Province Patentee after: NANJING ZHONGDIAN ENVIRONMENTAL PROTECTION SOLID WASTE RESOURCES CO.,LTD. Address before: 309 room 15, building 210000, hi tech Development Zone, Jiangsu, Nanjing Patentee before: Nanjing CEC Environmental Engineering Co.,Ltd. |
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Address after: No. 23, Liuzhou North Road, Jiangbei New District, Nanjing, Jiangsu 210000 Patentee after: Nanjing Zhongdian Environmental Protection Group Co.,Ltd. Address before: No. 23, Liuzhou North Road, Jiangbei New District, Nanjing, Jiangsu 210000 Patentee before: NANJING ZHONGDIAN ENVIRONMENTAL PROTECTION SOLID WASTE RESOURCES CO.,LTD. |
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