CN102358640A - Method for rapid purification of overflowing sewage in rainy days - Google Patents
Method for rapid purification of overflowing sewage in rainy days Download PDFInfo
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- CN102358640A CN102358640A CN2011102824816A CN201110282481A CN102358640A CN 102358640 A CN102358640 A CN 102358640A CN 2011102824816 A CN2011102824816 A CN 2011102824816A CN 201110282481 A CN201110282481 A CN 201110282481A CN 102358640 A CN102358640 A CN 102358640A
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Abstract
The invention relates to a method for rapid purification of overflowing sewage in rainy days. The method comprises the following steps: allowing overflowing sewage to be treated to enter into a pipeline mixer and fully mixing the overflowing sewage with a coagulant, with mixing time being 3 to 14 s; allowing the mixed overflowing sewage to enter into a reaction tank through a flowmeter and reacting the mixed overflowing sewage with a coagulant aid under agitation, with reaction time being 2 to 8 min; controlling the rotating speed of a pusher stirring paddle to be 50 to 200 revolution per minute; controlling the average G value of a reaction zone to be in a range of 50 to 100 by using a guide shell; allowing mixed overflowing sewage which has undergone treatment in the reaction tank to enter into a sedimentation basin through a diversion zone from an overflow weir for solid-liquid separation, wherein hydraulic retention time of the sedimentation basin is 2 to 30 min, and allowing effluent to flow into a water collecting tank through the overflow weir at the top of the sedimentation basin and to be discharged; discharging residual sludge in the sedimentation basin. The invention has the advantages of a small land occupation area, fast starting and convenient maintenance; an inclined tube layer and a suspending packing layer are simultaneously arranged in the sedimentation basin, which enables the problem of leakage of alumen ustum to be effectively overcome and strong adaptability to inflowing water and a better removal effect of SS (suspending substances) to be obtained.
Description
Technical field
The present invention relates to water pollution control engineering field, be specifically related to a kind of method of rainy day overflow sewage fast purification.
Background technology
Sewage, trade effluent and rainwater are blended in the system that discharges in the same set of raceway groove are called combined drainage system, set up the water body bank usually and hold back main, and set up sewage work endways.When fine, first rain and light rain, all sewage is all delivered to sewage work, enters water body after the processing; Along with the increase of rainfall, the corresponding increase of rainfall runoff when coming discharge to surpass to hold back the main transport capacity, overflow will occur, and partially mixed sewage directly gets into water body through overflow well, is called the combined sewage overflow.Research shows that there is severe contamination equally in the rainy day overflow water quality of separate sewage system.The combined sewage overflow is referred to as the rainy day overflow pollution with the pollution that the shunting stormwater overflow causes.Comprise a large amount of undressed lives and runoff sewage in the overflow sewage, these pollutents can pollute surface water body, and tap water is also had potential hazard.
Different with sewage water quality with trade effluent, the content ratio of suspended substance is big in the general overflow sewage, and the vary within wide limits that lasts with runoff of water quality, and overflow water quantitative change amplitude is also big; The impact load of short period of time is that trade effluent and sewage are beyond one's reach.
The pollution problem that China's rainfall runoff causes is quite serious.In important lakes such as Taihu Lake, Dian Chi, non-point pollution has become the one of the main reasons of water quality deterioration.Rainfall runoff carries a large amount of pollutents and enters urban water system and also cause severe contamination.Preliminary conservative estimation, the city rainfall runoff pollutes the ratio that accounts for the water pollution load, accounts for respectively about 12% and 20% in Beijing and Shanghai at present.
Abroad, a lot of successful commercializations of overflow sewage treatment process comprise the ACTIFLO technology of Kruger company, the DENSADEG technology of the Lemalla Plate technology of Parkson company and French Infilco Degremont company.These technologies all utilize chemical flocculation and physical sedimentation to handle overflow sewage, divide " mixing-reaction-deposition " three operating units.These technology waterpower surface loads are all very high, and therefore device is compact, and floor space is little, and toggle speed is fast, can reach stable peak load in common 30 minutes, and effluent quality is better.Wherein, the deposition of ACTIFLO technology, Lemalla Plate technology and DENSADEG technology part all utilizes inclined tube or swash plate to strengthen sedimentation effect.But, after load acquires a certain degree, can occur alumen ustum in the settling tank and run the phenomenon of emitting.
At the beginning of the seventies, the U.S. and Japan take the lead in fluidized-bed is used for the biological sewage treatment field and has carried out many-sided research, have obtained achievement preferably.But the carrier that fluidized-bed is commonly used has silica sand, hard coal, grain active carbon and coke, and their proportion is at 1.4 ~ 2.5kg/m
3, need the suitable water yield and tolerance just can make carrier, so power consumption is big in pond fluidisation entirely.For cutting down the consumption of energy, investigators have turned to proportion to approach the organic carrier of water sight, and a lot of scholars have begun the research of floating stuffing biological contact oxidation method Treating Municipal Sewage.Floating stuffing is compared with existing fixed, binding-type carrier, has more meliority in the use, is summarized as follows:
1. be shaped as stereo structure or particulate state, general regular shape, voidage is big, and specific surface area is big;
2. proportion approaches water, or is a bit larger tham 1, or is slightly smaller than 1.Floating stuffing can carry out back flushing with water flows after retaining power is saturated in reactor drum;
3. floating stuffing is better than the sinking filler at aspects such as holding back SS, degraded COD;
4. filler is generally processed with tailormadepistons such as Vilaterm, Vestolen PP 7052, urethane or resin, have in addition handle the easy set of mikrobe and small granular suspended matters with coating;
5. not conglomeration, do not stop up, cut dirty saturated back and lean on effects such as sluicing, aeration stirring to come off automatically;
6. directly add, need not fixed support, only need the aperture plate interception to be set in water outlet place.
The application of continually developing along with the development of close-coupled processing technology and light filter material; In settling tank, adopt inclined tube to combine light suspended filler to strengthen solid-liquid separation and be expected to solve the universal phenomenon that present overflow sewage treatment unit settling tank alumen ustum race is emitted, thereby improve treatment effect and load overflow sewage.
Summary of the invention
The objective of the invention is to propose a kind of method of rainy day overflow sewage fast purification.
The method of the rainy day overflow sewage fast purification that the present invention proposes is divided mixing, reacts and is precipitated three processing unit processes rainy day overflow sewages, and wherein mix stages is accomplished in line mixer, is provided with the helical fin in the line mixer; Step of reaction is accomplished in reaction tank, adopts pusher stirring rake to improve flow turbulence, and guide shell is set; Precipitate phase is accomplished in settling tank, and the lower left quarter of settling tank is provided with baffle plate, and the middle and upper part is provided with inclined tube, and on the top of inclined tube the floating stuffing layer is set; Line mixer ligation pond water-in, reaction tank and settling tank are connected through the water conservancy diversion district; Concrete steps are following:
(1) pending overflow sewage is fed line mixer, with the coagulating agent thorough mixing that from dosing tank, pumps into line mixer through volume pump, mixing time is 3-14 second;
(2) mixed sewage gets into reaction tank through under meter, reacts through stirring with the coagulant aids that adds in the reaction tank through volume pump, and the reaction times is 2-8 minute; Through the stirring of pusher stirring rake, make inside and outside formation of guide shell go up current downflow in the reaction tank, pusher rotating speed of agitator is 50-200 rev/min; Guide shell is controlled between the 50-100 the average G value of reaction zone;
(3) mixed solution after reaction tank is handled carries out solid-liquid separation from overflow weir through water conservancy diversion district entering settling tank, and the hydraulic detention time of settling tank is 2-30 minute, discharges behind the overflow weir inflow water leg of water outlet through the settling tank top; The settling tank excess sludge discharge; Floating stuffing layer in the settling tank adopts reinforcing mat to fix, and promptly lays one deck reinforcing mat on inclined tube layer top, as the bottom of floating stuffing layer with the support suspension filler; Re-lay one deck reinforcing mat in the bottom of settling tank effluent weir, the top as the floating stuffing layer floats prevents that floating stuffing from flowing out settling tank with water outlet; Distance between the two-layer reinforcing mat is 1-2 a times of floating stuffing layer thickness.
Among the present invention, the coagulating agent in the step (1) can adopt Poly aluminum Chloride (PAC) (PAC), aluminium iron polychloride (PAFC) or Tai-Ace S 150 (Al
2(SO
4)
3), the add-on of coagulating agent is 30mg/L-200mg/L.
Among the present invention, the coagulant aids in the step (2) is SEPIGEL 305 (PAM), and add-on is 0.4-2.5mg/L.
Among the present invention; Overflow sewage is taken from the pump well or the overflow drain of pumping plant; Promote or flow by gravity gets into header through submersible pump, mix at the front end and the coagulating agent of line mixer, the eddy flow of helical fin generation makes medicament and the sewage can short mix in the mixing tank; The water inlet of reaction tank is provided with and adds snack made with traditional Chinese medicines adding coagulant aids, and the control stirring velocity, makes inside and outside formation of guide shell go up current downflow, for the growth of flco creates conditions; The reaction tank water outlet gets into the water conservancy diversion district in the settling tank through overflow weir, and in the settling tank lower left baffle plate is set, and the angle theta of baffle plate direction deflection top and pool wall is the 30-90 degree; Because the effect of baffle plate, it is more even to intake, and the flow velocity that the reaction tank mixed solution gets into settling tank can be effectively controlled; Adopt the major diameter inclined tube in the settling tank, laying angle is the 35-65 degree; Floating stuffing is generally selected the Ball-type packing of porosity more than 90%, and material is generally tailormadepiston or resins such as Vilaterm, Vestolen PP 7052.
The maximum innovative point of the present invention is settling tank.The inner inclined tube of settling tank plays rectifying action, removes a part of flco and particulate matter thereof in the water; Remaining flco and particulate matter are removed by floating stuffing.Flco and particle with certain flow rate are because floating stuffing body inhibition, and two kinds of variations may take place movement locus: 1. held back by the floating stuffing body, form contact absorption; 2. particle motion and speed change, and the floc particle in the adjacent fluid layer produces velocity slope and more is prone to combine cohesion, and the essence of this effect is the reflocculation effect.On the whole; Inclined tube and floating stuffing bonded settling tank mainly are to realize through four kinds of modes to the absorption of holding back of flco: the one, and gravity settling; The 2nd, the mud-water separation effect of inclined tube, the 3rd, the vortex that the peripheral water body yardstick of particle does not wait causes floc particle to cause in three-dimensional random motion with the collision of floating stuffing to adsorb; The 4th, floc particle forms with the direct impact of floating stuffing and contacts absorption.Along with the settling tank operation; Floating stuffing district floc particle concentration progressively increases; Form the contact condensation region in the floating stuffing layer gradually; The endoparticle flow velocity will lag behind the horizontal flow velocity of settling tank in the contact condensation region, and this lag-effect is that the reflocculation of flco has been created good water conservancy condition, be beneficial to floating stuffing collision deposition simultaneously and contact cohesion.The collision precipitation process of floc particle and floating stuffing is carried out in the three-dimensional space of settling tank packing area.This effect has polytropism and short range characteristics, and the unique hydraulic performance and the mechanism of action of floating stuffing in addition has the good function of holding back to little flocs unit particle of settling property difference, runs the problem of emitting thereby can solve alumen ustum.So inclined tube and floating stuffing bonded settling tank have better SS removal effect than traditional settling tank.In addition, according to the analog result of Fluent software, after the settling tank lower left is provided with baffle plate, and baffle plate is not set compares hydraulics and improve greatly, the current dead band also reduces to some extent in the settling tank, and hydraulic load can reach 32m
3/ (m
2H), be more than 15 times of common settling tank.
In sum, innovative point of the present invention has: 1, collection mixes, reacts, is precipitated as one, efficient fast processing rainy day overflow sewage, and floor space is little, starts fast, easy to maintenance; 2, inclined tube layer and floating stuffing layer are set simultaneously in the settling tank, can effectively solve alumen ustum and run the problem of emitting, strong to water inlet flexibility; 3, floating stuffing makes device to the removal of SS better effect arranged to the contact adsorption of fine particle thing; 4, according to the analog result of Fluent software, in the settling tank lower left baffle plate is set, and baffle plate is not set compares hydraulics and improve greatly, the current dead band also reduces to some extent in the settling tank, and hydraulic load is more than 15 times of common settling tank.
Description of drawings
Fig. 1 is a process flow sheet of the present invention.
Fig. 2 is the diagram when settling tank is vacant in apparatus of the present invention.
Fig. 3 is the diagram when settling tank moves in apparatus of the present invention.
Label among the figure: 1 is water leg, and 2 is the floating stuffing layer, and 3 is inclined tube, and 4 is the water conservancy diversion district, and 5 is flow-stopping plate, and 6 is shore pipe.
Embodiment
Through embodiment the present invention is further specified below.
Embodiment 1: handle dry flow sewage
The pilot plant test place is Longgang District, a Shenzhen combined system drainage pumping station, intakes to be the combined system dry flow sewage.Concrete testing sequence is following:
(1) sewage mixes with coagulating agent PAC in mixing pit, and mixing time is 7 seconds, and PAC concentration is 80mg/L;
(2) mixed sewage gets into reaction tank, mixes with coagulant aids PAM in the reaction tank, and PAM concentration is 1mg/L; Average G value maintains 60s in the reaction tank
-1, hydraulic detention time is 5 minutes; Rotating speed of agitator is 70 rev/mins in the reaction tank;
(3) mixed solution gets into settling tank by the water conservancy diversion district, and the settling tank hydraulic surface loading is 32m
3/ (m
2H), hydraulic detention time is 10 minutes; The inclined tube diameter is 50mm, and length is 1000mm; Floating stuffing layer bottom reinforcement bars net is apart from inclined tube 0.3m; Floating stuffing adopts ZG100 type filler, and external diameter is 100mm, and surface-area is 0.162m
2/ only, every cubic metre of floating stuffing has 1000 approximately.Settling tank be provided with baffle plate (with the angle theta of pool wall be 70 degree) and be not provided with under the situation of baffle plate and respectively carry out a test.Test-results is as shown in table 1.
Table 1 is handled dry flow sewage test (mg/L)
The result shows, baffle plate is set after, device all has lifting to the removal effect of SS, COD, TP.
Embodiment 2: handle medium tenacity rainfall combined sewage
Compare with dry flow sewage, be mixed with more rainwater in the medium tenacity rainfall combined sewage; Because rainwater washes away ground, water-quality guideline such as rainfall initial stage SS raise to some extent.Concrete testing sequence is following:
(1) sewage mixes with coagulating agent PAC in line mixer, and mixing time is 8 seconds, and PAC concentration is 120mg/L;
(2) mixed sewage gets into reaction tank, mixes with coagulant aids PAM in the reaction tank, and PAM concentration is 0.8mg/L; Average G value maintains 80s in the reaction tank
-1, hydraulic detention time is 5 minutes; Rotating speed of agitator is 80 rev/mins in the reaction tank;
(3) mixed solution gets into settling tank by the water conservancy diversion district, and the settling tank hydraulic surface loading is 25.6m
3/ (m
2H), hydraulic detention time is 15 minutes; The inclined tube diameter is 50mm, and length is 1000mm; Floating stuffing layer bottom reinforcement bars net is apart from inclined tube 0.4m; Floating stuffing adopts ZG100 type filler, and external diameter is 100mm, and surface-area is 0.162m
2/ only, every cubic metre of floating stuffing has 1000 approximately; The angle theta of settling tank baffle plate and pool wall is 80 degree.Test-results is as shown in table 2.
Table 2 is handled medium tenacity rainfall combined sewage test (mg/L)
Embodiment 3: handle the high-intensity rainfall combined sewage
At the high-intensity rainfall initial stage, water-quality guideline such as SS raises rapidly in the short period of time in the combined sewage.Concrete testing sequence is following:
(1) sewage mixes with coagulating agent PAC in line mixer, and mixing time is 10 seconds, and PAC concentration is 140mg/L;
(2) mixed sewage gets into reaction tank, mixes with coagulant aids PAM in the reaction tank, and PAM concentration is 1.2mg/L; Average G value maintains 100s in the reaction tank
-1, hydraulic detention time is 5 minutes; Rotating speed of agitator is 90 rev/mins in the reaction tank;
(3) mixed solution gets into settling tank by the water conservancy diversion district, and the settling tank hydraulic surface loading is 28.8m
3/ (m
2H), hydraulic detention time is 10 minutes; The inclined tube diameter is 50mm, and length is 1000mm; Floating stuffing layer bottom reinforcement bars net is apart from inclined tube 0.3m; Floating stuffing adopts ZG100 type filler, and external diameter is 100mm, and surface-area is 0.162m
2/ only, every cubic metre of floating stuffing has 1000 approximately; The angle theta of settling tank baffle plate and pool wall is 80 degree.Test-results is as shown in table 3.
Table 3 is handled medium tenacity rainfall combined sewage test (mg/L)
Claims (3)
1. the method for a rainy day overflow sewage fast purification adopts and mixes, reacts and precipitate three processing unit processes rainy day overflow sewages, it is characterized in that mix stages accomplishes in line mixer, is provided with the helical fin in the line mixer; Step of reaction is accomplished in reaction tank, adopts pusher stirring rake to improve flow turbulence, and guide shell is set; Precipitate phase is accomplished in settling tank, and the lower left quarter of settling tank is provided with baffle plate, and the middle and upper part is provided with inclined tube, and on the top of inclined tube the floating stuffing layer is set; Line mixer ligation pond water-in, reaction tank and settling tank are connected through the water conservancy diversion district; Concrete steps are following:
(1) pending overflow sewage is fed line mixer, with the coagulating agent thorough mixing that from dosing tank, pumps into line mixer through volume pump, mixing time is 3-14 second;
(2) mixed sewage gets into reaction tank through under meter, reacts through stirring with the coagulant aids that adds in the reaction tank through volume pump, and the reaction times is 2-8 minute; Through the stirring of pusher stirring rake, make inside and outside formation of guide shell go up current downflow in the reaction tank, pusher rotating speed of agitator is 50-200 rev/min; Guide shell is controlled between the 50-100 the average G value of reaction zone;
(3) mixed solution after reaction tank is handled carries out solid-liquid separation from overflow weir through water conservancy diversion district entering settling tank, and the hydraulic detention time of settling tank is 2-30 minute, discharges behind the overflow weir inflow water leg of water outlet through the settling tank top; The settling tank excess sludge discharge; Floating stuffing layer in the settling tank adopts reinforcing mat to fix, and promptly lays one deck reinforcing mat on inclined tube layer top, as the bottom of floating stuffing layer with the support suspension filler; Re-lay one deck reinforcing mat in the bottom of settling tank effluent weir, the top as the floating stuffing layer floats prevents that floating stuffing from flowing out settling tank with water outlet; Distance between the two-layer reinforcing mat is 1-2 a times of floating stuffing layer thickness.
2. method according to claim 1 is characterized in that coagulating agent in the step (1) adopts in Poly aluminum Chloride (PAC), aluminium iron polychloride or the Tai-Ace S 150 any, and the add-on of coagulating agent is 30mg/L-200mg/L.
3. method according to claim 1 is characterized in that the coagulant aids in the step (2) is a SEPIGEL 305, and add-on is 0.4-2.5mg/L.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104307255A (en) * | 2014-10-27 | 2015-01-28 | 苏州新协力环保科技有限公司 | Improved anthracite filter material for sewage treatment |
| CN104341058A (en) * | 2013-08-01 | 2015-02-11 | 甘肃省环境科学设计研究院 | Medical waste disposal wastewater treatment system |
| CN105858843A (en) * | 2016-05-27 | 2016-08-17 | 河南师范大学 | Ammonia nitrogen recovery system for hair product wastewater and operating method of system |
| CN108285210A (en) * | 2018-02-02 | 2018-07-17 | 同济大学建筑设计研究院(集团)有限公司 | Integral type unpowered cyclone precipitates film filtering reactor |
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| CN2534169Y (en) * | 2002-03-27 | 2003-02-05 | 陈靖山 | Rain filtering penetration apparatus |
| CN1613792A (en) * | 2004-10-19 | 2005-05-11 | 上海地球工程咨询有限公司 | Overflowing rain water settling method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104341058A (en) * | 2013-08-01 | 2015-02-11 | 甘肃省环境科学设计研究院 | Medical waste disposal wastewater treatment system |
| CN104307255A (en) * | 2014-10-27 | 2015-01-28 | 苏州新协力环保科技有限公司 | Improved anthracite filter material for sewage treatment |
| CN105858843A (en) * | 2016-05-27 | 2016-08-17 | 河南师范大学 | Ammonia nitrogen recovery system for hair product wastewater and operating method of system |
| CN108285210A (en) * | 2018-02-02 | 2018-07-17 | 同济大学建筑设计研究院(集团)有限公司 | Integral type unpowered cyclone precipitates film filtering reactor |
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Application publication date: 20120222 |