CN101117250A - Method and equipment for purifying recirculated cooling water or town B-grade sewage - Google Patents
Method and equipment for purifying recirculated cooling water or town B-grade sewage Download PDFInfo
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- CN101117250A CN101117250A CNA2007100999699A CN200710099969A CN101117250A CN 101117250 A CN101117250 A CN 101117250A CN A2007100999699 A CNA2007100999699 A CN A2007100999699A CN 200710099969 A CN200710099969 A CN 200710099969A CN 101117250 A CN101117250 A CN 101117250A
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Abstract
The invention relates to a purification method and equipment for cool circulating water or town secondary sewage water, and is characterized in that the invention has the following steps: a quick mixing zone 1 for mixing a ready treated liquid and a mixing medicament, a flocculating reaction zone 2 for mixing and flocculating a mixed liquid with a backflow deposit substance to get a compact alum at an outlet of the zone, a depositing and concentrating zone 3 for separating a supernatant liquor and a suspension solid and for returning and draining a deposit substance, and a filtering facility zone 4 for purifying the supernatant liquor; the equipment of the invention mainly comprises the quick mixing zone, a high efficient clarification tank and a filtering zone; the invention designs the purification method and equipment for liquid and water; the water quality from the invention is stable, the cost is lower, which changes the prior purification method for liquid and water.
Description
Technical field
The present invention relates to the purifying method and the equipment of recirculated cooling water or town B-grade sewage, especially for the purifying method and the equipment of firepower factory recirculated cooling water Treatment for Reuse or town sewage advanced treatment.
Background technology
In the existing similar technology, separate and contact-type lime treatment settling pond (Quan Chidi scrapes mud) with the body refuse after suspension body refuse type accelerator (Ban Chidi scrapes mud) or the improvement that is mostly that becomes fracture filtration device series connection use, the pond type is circle, medicament mixes, flocculation reaction, sedimentable matter refluxes, reaction process such as solid matter separation are all finished in a reactor, the operational conditions of can't independent optimization adjusting single reaction process, the degree of compactness of the flocs unit that generates is little, the isolating efficient of solid is low, the suspension slime layer concentration instability that forms causes the floor space of reactor big, hardware is many, capacity of resisting impact load is poor.Aforesaid method has shortcomings such as floor space is big, cost of investment is higher, operational management is complicated, capacity of resisting impact load difference in use.
Summary of the invention
The purifying method and the equipment that the purpose of this invention is to provide recirculated cooling water or town B-grade sewage, problems such as the prior art floor space is big, one-time investment is high, operational management is complicated to avoid, anti-load impact ability, it is optimization method and the equipment design structure that is fit to China's actual conditions.
The purifying method of recirculated cooling water or town B-grade sewage is characterized in that, pass through following several steps:
A. pending liquid is introduced short mix zone 1, add one or more reagent, and reagent and pending liquid are mixed;
The pending liquid that b. will mix carries out the high speed clarification in the high speed settling pond, the supernatant liquor that obtains is drawn;
C. above-mentioned supernatant liquor is introduced filtration zone 4, filling filtering material in the filtration zone 4.
Described step a. introduces short mix district 1 with pending liquid, and when adding a kind of reagent, this reagent is coagulating agent.
Described step a. introduces short mix zone 1 with sewage, and when adding plurality of reagents, this plurality of reagents can be lime medicament and one or more coagulating agent.
After described pending liquid entered the mixing zone 12 in short mix zone 1, pending liquid designs the residence time in mixing zone 12 be 30～240 seconds, and the preferred residence time is 45～180 seconds.
Described lime medicament is by the lime device it to be joined in the short mix zone 1, and the lime device adopts dry powder metering, modular arrangements, whole process automatization control, airtight operation.
Described dry powder metering is the amount of directly measuring dry powder, realizes that by the dosage that changes dry powder the ratio of lime dosage and settling pond inlet water flow is regulated.
Described whole process automatization control, be that make up a prescription unit, milk of lime of milk of lime added the unit and control automatically, comprise automatic operation and automatic control cleaning etc., the vibrations hopper of setting the lime silo blanking is simultaneously avoided system jams according to regularly anti-clogging plug concussion of grey matter.
Described coagulating agent can be a liquid polymerization ferric sulfate, and dosage is 10～15 mg/litre.
The pending liquid that described step b. will mix carries out the high speed clarification in the high speed settling pond, its high speed settling pond comprises that flocculation reaction zone 2 and precipitation concentrate zone 3, clarification comprises that the pending liquid that mixes concentrates regional 3 rapid precipitation in the flocculation reaction in flocculation reaction zone 2 with in precipitation at a high speed.
Described flocculation reaction, be to adopt circulating granular to quicken flocculation to mixed uniform pending liquid, with multistage flocculation reaction, to reduce the best flocculation reaction time, its pending liquid is 10～20 minutes in this region design residence time, the preferred design residence time is 10～15 minutes, is 1/3～1/2 of the conventional flocculation reaction time.
Described employing circulating granular quickens flocculation, be after mixing with mechanical stirring device uniform pending liquid, with the partly precipitated material cycle utilize, with sedimentation speed gradients in the control flow velocity control flocculation reaction zone 2 at 250～450 seconds
-1Scope, and add high molecular polymer, to realize the further closely knit of flocculation reaction product, improve the settling velocity of flocculation reaction product.
Described mechanical stirring device adopts the axial flow agitator, and guiding device is set.
Described multistage flocculation reaction comprises secondary flocculation reaction at least, and first step flocculation reaction is mechanical flocculation reaction, and second stage flocculation reaction is the waterpower flocculation reaction.
Described high speed clarification, the flow velocity that its supernatant liquor rises is 10～30 meters/hour, preferred upflow velocity is 10～20 meters/hour.
Described rapid precipitation, comprise treat treatment solution carry out preliminary precipitation handle, treat the sedimentable matter interface of treatment solution control, with the clarification of holey tripping device, the approximate settled control method of discrete particle.
Described sedimentable matter interface is controlled, be that the pending liquid after the flocculation is introduced precipitation enrichment region 3, the suspended solids of holding back enters enrichment region 33, and being provided with in precipitation concentrates zone 33 that sedimentable matter strikes off collection device, side device and sedimentable matter discharge equipment are visited in the sedimentable matter interface, its sedimentable matter strikes off collection device and visits the signal control sedimentable matter discharge equipment that the side device provides, the operation that sedimentable matter strikes off collection device according to the sedimentable matter interface.
Described with the clarification of holey tripping device, be that pending liquid is risen by holey tripping device 32, obtain supernatant liquor, the hydraulic radius of holey tripping device, mounting height can be determined according to the water-quality guideline of treatment solution.
The settled control method of described approximate discrete particle is to concentrate the Reynolds number in zone 33 and solid surface load and make solid particles sediment speed after the flocculation reaction near the discrete particle settling velocity by adjusting precipitation.
Described high speed settling pond, the sedimentable matter concentration of its discharging can reach 20～100mg/L (mg/litre), can directly dewater, and need not concentration.
Described step c is introduced filtration zone 4 with above-mentioned supernatant liquor, be filled with the filtering material of porosity in the filtration zone 4 along Cheng Bianhua, be the water distributing area 41 of earlier above-mentioned supernatant liquor being introduced filtration zone 4, enter influent weir chamber 42, filtration zone 4 body region 43 and outlet system 44 more successively; Supernatant liquor carries out deep-bed filtration in filtration zone 4 body region 43.
The design current velocity of the filtration zone 4 of described step c is 10～18 meters/hour, and the preferred design flow velocity is 10～14.5 meters/hour.
Described water distributing area 41 can add sulfuric acid or/and coagulating agent, and thorough mixing.
The body region 43 of described filtration zone 4, porosity of the filtering material of filling is along Cheng Bianhua in it.
The washing of described filtering material can be adopted the mode of combined water and air backwash.
Described filtration zone 4 body region 43 adopt permanent liquid level drag flow deep-bed filtration.
Described coagulating agent can be molysite or aluminium salt.
It mainly comprises and is positioned at short mix zone 1, high speed settling pond and filtration zone 4, short mix zone 1 and at a high speed between the clarification, have water channel to connect between high speed settling pond and the filtration zone 4.
Described high speed settling pond can be divided into flocculation zone 2 and precipitation enrichment region 3.
Described flocculation zone 2 comprises current stabilization district 21, inlet channel 22, mechanical flocculation zone 23 and plug-flow flocculation zone 24 again successively, in the wherein mechanical flocculation zone 23 agitator 25 is arranged.
Described precipitation enrichment region 3 tops are provided with the holey tripping device, and precipitation enrichment region (3) bottom is provided with sedimentable matter and strikes off collection device.
The top that the sedimentable matter of described precipitation enrichment region 3 strikes off collection device is connected with the sedimentable matter discharge equipment.
Described filtration zone 4 mainly comprises water distributing area 41, influent weir chamber 42, body region 43 and exhalant region 44.
Described body region 43 is a drag flow deep-bed filtration device, promptly is provided with filtering material and supporting layer in the body region 43, under the supporting layer water and air distributing device is housed.
Described body region 43 also comprises the washing and filtering device, discharges the constant fluid level control device of filtered liquid.
Be provided with the suspended sediment concentration meter in the described short mix zone 1.
Be provided with one or more reagent dispensers in the described short mix zone 1.
The present invention conceives purifying method and the equipment that has designed a kind of sewage, the present invention designs ingenious, novel, changed the mode of the purification of sewage in the past, avoid problems such as the prior art floor space is big, one-time investment is high, operational management is complicated, anti-load impact ability.
The present invention also has following advantage:
1, the present invention adds reagent in short mix zone 1, can make pending liquid and reagent thorough mixing, helps the generation of floss;
2, the lime medicament is by the lime device it to be joined in the short mix zone 1, help the lime medicament quantitatively, on time, do not have to leak ground and throw in;
3, adopt circulating granular to quicken flocculation, pending liquid is flocculated better, with speed and the degree of accelerating to purify;
4, it is can pending clarifying speed very fast to clarify pending liquid with the holey tripping device;
5, use multistage flocculation reaction, can make pending more throw outs that are settled out;
6, adopt the drag flow deep-bed filtration, supernatant liquor is better purified, more existing filtration, degree of purification is better;
7, the present invention is optimization method and the equipment design structure that is fit to China's actual conditions.
Description of drawings
Fig. 1, device structure synoptic diagram of the present invention;
The vertical view in the short mix zone 1 of Fig. 2, present device;
The front view in the short mix zone 1 of Fig. 3, present device;
The lime apparatus structure synoptic diagram of Fig. 4, present device;
The vertical view in the flocculation reaction zone of the high speed settling pond of Fig. 5, present device;
The front view in the flocculation reaction zone of the high speed settling pond of Fig. 6, present device;
The vertical view in the precipitin reaction zone of the high speed settling pond of Fig. 7, present device;
The front view in the precipitin reaction zone of the high speed settling pond of Fig. 8, present device;
Filtration zone 4 vertical views of Fig. 9, present device;
Figure 10, Fig. 9 D-D sectional view;
Figure 11, Figure 11 E-E sectional view;
The process flow sheet of Figure 12, method of the present invention.
Number in the figure wherein, 1 is the short mix zone, 2 are the flocculation reaction zone, 3 for precipitation concentrates the zone, and 4 is filtration zone, and 11 is irrigation channel, 12 is the mixing zone, and 13 for going out water channel, and 14 is agitator, 15 is lime, and 16 is flooded zonevvv, and 21 is the current stabilization district, 22 is inlet channel, and 23 is mechanical flocculation zone, and 24 is the plug-flow flocculation zone, 25 is agitator, and 31 is the preliminary sedimentation district, and 32 is the holey tripping device, 33 is enrichment region, and 34 is mud scraper, and 35 is the sedimentable matter return line, 36 is the sedimentable matter delivery pipe, and 37 is the V-type Sludge Bed, and 38 is sedimentable matter interface determinator, 39 is the water leg device, and 41 is water distributing area, and 42 is the mill weir chamber, 43 is body region, and 44 is exhalant region.
Embodiment
The purifying method of recirculated cooling water or town B-grade sewage is characterized in that, pass through following several steps:
A. pending liquid is introduced short mix zone 1, add one or more reagent, and reagent and pending liquid are mixed;
The pending liquid that b. will mix carries out the high speed clarification in the high speed settling pond, the supernatant liquor that obtains is drawn;
C. above-mentioned supernatant liquor is introduced filtration zone 4, filling filtering material in the filtration zone 4.
Described step a. introduces short mix district 1 with pending liquid, and when adding a kind of reagent, this reagent is coagulating agent.
Described step a. introduces short mix zone 1 with sewage, and when adding plurality of reagents, this plurality of reagents can be lime medicament and one or more coagulating agent.
After described pending liquid entered the mixing zone 12 in short mix zone 1, pending liquid designs the residence time in mixing zone 12 be 30～240 seconds, and the preferred residence time is 45～180 seconds.
Described lime medicament is by the lime device it to be joined in the short mix zone (1), and the lime device adopts dry powder metering, modular arrangements, whole process automatization control, airtight operation.
The powdery slaked lime is transported by closed tank truck, and strength is unloaded ash.Gas drains into atmosphere after being separated by the head space gas powder.The ash output hole place is provided with the stifled facility of anti-canopy, and slaked lime powder enters feeding machine, and the rotary feeder motor adopts variable frequency control, slaked lime powder dosage and the proportional adjusting of settling pond inlet flow rate.Wherein the lime powder feeding machine is selected import equipment for use, accurate measurement, and maintenance is little.
Dry powder metering, the concentration that changes lime slurry is to realize metering, and is accurately simple, and control easily is one of characteristics of native system.Like this, can keep pipeline sodalime breast under nominal flow rate, to move, with the wearing and tearing of avoiding fluctuations in discharge to cause.
Slaked lime powder is after metering delivered to the vapour powder separator on the top of lime agitator tank via worm conveyor, dry powder meets and separated at vapour powder separator with the steam of discharging when entering agitator tank, and powder falls into case, and steam then drains into outside the case.Powder mixes, stirs, is dissolved into milk of lime with the clear water that enters from auxiliary water tank in agitator tank, is sent to settling pond by Lime Milk Transfer Pump.
Slaked lime is stored, metering, system breast, add and be the unit configuration, and each overlaps every settling pond with one, and Lime Milk Transfer Pump 100% is standby.
Whole process automatization control is another characteristics of native system.The vibrations hopper of lime silo blanking can block up to avoid down grey manteau according to regularly anti-clogging plug concussion of grey matter.But the start and stop of milk of lime dosing unit, Lime Milk Transfer Pump all program are operated, and each step all cleans up the inactive part of this system automatically.
All system and equipment are in the air-tight state operation, and the axle head of rotary machine etc. locates all to take lubricated and flushing measure, to alleviate wearing and tearing and to leak.
Described coagulating agent can be a liquid polymerization ferric sulfate, and dosage is 10～15 mg/litre.
The pending liquid that described step b. will mix carries out the high speed clarification in the high speed settling pond, its high speed settling pond comprises that flocculation reaction zone 2 and precipitation concentrate zone 3, clarification comprises that the pending liquid that mixes concentrates regional 3 rapid precipitation in the flocculation reaction in flocculation reaction zone 2 with in precipitation at a high speed.
Described flocculation reaction is to adopt circulating granular to quicken flocculation and multistage flocculation reaction to mixed uniform pending liquid.
Described employing circulating granular quickens flocculation, be after mixing with mechanical stirring device uniform pending liquid, with the partly precipitated material cycle utilize, with sedimentation speed gradients in the control flow velocity control flocculation reaction zone 2 at 250～450 seconds
-1Scope, and add high molecular polymer.
The main effect that circulating granular quickens flocculation technique has: one, increase system anti-water quality impact load ability; Two, the flocculation particle constantly is squeezed, discharges wherein moisture, increase pellet density; Three, form the stable suspersion slime layer,, improve the heavy speed of particle with slow particle (such as the magnesium hydroxide particle) collision of heavy speed.Four, by mechanical effect, hydraulic action, change the shape of flocs unit, make it subglobular.
Described multistage flocculation reaction comprises secondary flocculation reaction at least, and first step flocculation reaction is mechanical flocculation reaction, and second stage flocculation reaction is the waterpower flocculation reaction.
Described flocculation reaction, its pending liquid is 10～20 minutes in this region design residence time, the preferred design residence time is 10～15 minutes.
Described rapid precipitation comprises that the sedimentable matter interface for the treatment of treatment solution is controlled, usefulness holey tripping device is clarified, the approximate settled control method of discrete particle.
Described sedimentable matter interface is controlled, be that the pending liquid after the flocculation is introduced precipitation enrichment region 3, the suspended solids of holding back enters enrichment region 33, and in precipitation concentrates zone 33 sedimentable matter is set and strikes off collection device and sedimentable matter interface means of detection.
Described with the clarification of holey tripping device, be that pending liquid is risen by holey tripping device 32, obtain supernatant liquor, the flow velocity of its rising is 10～30 meters/hour, preferred upflow velocity is 10～20 meters/hour.
The settled control method of described approximate discrete particle is to make the solid particles sediment of flocculating near the discrete particle settling velocity by adjusting the Reynolds number and the solid surface load that precipitate concentrated zone 33.
The reason that the depositing separation area upflow velocity increases mainly contains: one, quickening flocculation technique by circulating granular has increased flocculation particulate density; Two, adjust Reynolds number and reduce particle penetration resistance coefficient; Three, particle is spherical in shape, and median size reduces, and settling velocity is near the heavy speed of discrete particle; Four, control solid surface load prevents crowded sedimentary generation; Five, adopt the holey tripping device.
Described step c is introduced filtration zone 4 with above-mentioned supernatant liquor, be filled with the filtering material of porosity in the filtration zone 4 along Cheng Bianhua, be the water distributing area 41 of earlier above-mentioned supernatant liquor being introduced filtration zone 4, enter influent weir chamber 42, filtration zone 4 body region 43 and outlet system 44 more successively; Supernatant liquor carries out deep-bed filtration in filtration zone 4 body region 43.
The design current velocity of the filtration zone 4 of described step c is 10～18 meters/hour, and the preferred design flow velocity is 10～14.5 meters/hour.
Described water distributing area 41 can add sulfuric acid or/and coagulating agent, and thorough mixing.
In treating water, add flocculation agent.Utilize that suspended particle in the filtering layer hole orthokinetic flocculation takes place in the filtration procedure, thereby increased small granular suspended matters and become macrobead and, improved filter effect, improved filtering water by the possibility that filtrate stops.
The body region 43 of described filtration zone 4, porosity of the filtering material of filling is along Cheng Bianhua in it.
The main coarse media that uses, the surface filtration that has occurred when having avoided adopting the fine filtering material avoids suspended substance to penetrate filter material layer too early simultaneously, thereby reduces the filtering layer resistance, improves retaining power, helps improving filtering velocity.
In filtering layer, added a small amount of fine filtering material, and be dispersed in the whole filtering layer, mix with pressurized air after each backwash, thereby reduced the local porosity of coarse media, make that the average pore passage of filtrate is very little, so just under the prerequisite that does not reduce retaining power, improved flocculation efficiency.
The washing of described filtering material can be adopted the mode of combined water and air backwash.
Described filtration zone 4 body region 43 adopt permanent liquid level drag flow deep-bed filtration.
Described coagulating agent can be molysite or aluminium salt.
The treating plant of recirculated cooling water or town B-grade sewage, it is characterized in that, it mainly comprises and is positioned at short mix zone 1, high speed settling pond and filtration zone 4, short mix zone 1 and at a high speed between the clarification, have water channel to connect between high speed settling pond and the filtration zone 4.
Described high speed settling pond can be divided into flocculation zone 2 and precipitation enrichment region 3.
Described flocculation zone 2 comprises current stabilization district 21, inlet channel 22, mechanical flocculation zone 23 and plug-flow flocculation zone 24 again successively, in the wherein mechanical flocculation zone 23 agitator 25 is arranged.
Described precipitation enrichment region 3 tops are provided with the holey tripping device, and precipitation enrichment region 3 bottoms are provided with sedimentable matter and strike off collection device.
The top that the sedimentable matter of described precipitation enrichment region 3 strikes off collection device is connected with the sedimentable matter discharge equipment.
Described filtration zone 4 mainly comprises water distributing area 41, influent weir chamber 42, body region 43 and exhalant region 44.
Described body region 43 is a drag flow deep-bed filtration device, promptly is provided with filtering material and supporting layer in the body region 43, under the supporting layer water and air distributing device is housed.
Described body region 43 also comprises the washing and filtering device, discharges the constant fluid level control device of filtered liquid.
Be provided with the suspended sediment concentration meter in the described short mix zone 1.Be provided with one or more reagent dispensers in the described short mix zone 1.
The recirculated cooling water that the present invention relates to or the purifying method of town B-grade sewage, it is characterized in that it comprises: a short mix zone 1, be used to mix pending liquid and coagulated agent, a high speed settling pond, be used for mixed pending liquid flocculation and rapid precipitation, and a filtration zone 4 that is used to purify supernatant liquor.
Concrete technical process is described as follows in conjunction with Fig. 1:
Short mix zone 1
Pending liquid is entered the irrigation channel 11 in short mix zone 1 by the bottom, enter mixing zone 12 in the lump with the lime medicament that adds in this district, coagulant dosage under the effect of agitator 14, enters water outlet canal 13 behind pending liquid, lime, the coagulating agent thorough mixing in mixing zone 12.When the pending flow quantity that enters was excessive, unnecessary flow was by flooded zonevvv 16 dischargings.
The design residence time suggestion of pending liquid in mixing zone 12 is 30s (second)～240s, and the preferred residence time is 45s～180s.
Its dosage determines that according to the hardness of pending liquid coagulating agent can be selected molysite or aluminium salt, and dosage is determined by medicament kind and pending liquid water quality.
The powdery slaked lime is transported by closed tank truck, and strength is unloaded ash.Gas drains into atmosphere after being separated by the head space gas powder.The ash output hole place is provided with the stifled facility of anti-canopy, and slaked lime powder enters feeding machine, and rotation feed motor adopts variable frequency control, slaked lime powder dosage and the proportional adjusting of settling pond inlet flow rate.Wherein the lime powder feeding machine is selected import equipment for use, accurate measurement, and maintenance is little.Dry powder metering, the concentration that changes lime slurry is to realize metering, and is accurately simple, and control easily is one of characteristics of native system.Like this, can keep pipeline sodalime breast under nominal flow rate, to move, with the wearing and tearing of avoiding fluctuations in discharge to cause.
Slaked lime powder is after metering delivered to the vapour powder separator on the top of lime agitator tank via worm conveyor, dry powder meets and separated at vapour powder separator with the steam of discharging when entering agitator tank, and powder falls into case, and steam then drains into outside the case.Powder mixes, stirs, is dissolved into milk of lime with the clear water that enters from auxiliary water tank in agitator tank, is sent to settling pond by Lime Milk Transfer Pump.
Slaked lime is stored, metering, system breast, add and be the unit configuration, and each overlaps every settling pond with one, and Lime Milk Transfer Pump 100% is standby.
Whole process automatization control is another characteristics of native system.The vibrations hopper of lime silo blanking can block up to avoid down grey manteau according to regularly anti-clogging plug concussion of grey matter.But the start and stop of milk of lime dosing unit, Lime Milk Transfer Pump all program are operated, and each step all cleans up the inactive part of this system automatically.
All system and equipment are in the air-tight state operation, and the axle head of rotary machine etc. locates all to take lubricated and flushing measure, to alleviate wearing and tearing and to leak.
Establish 1 suspended sediment concentration meter in the short mix zone 1,1 cover floating-ball level switch.
The high speed settling pond
The high speed settling pond comprises that flocculation reaction zone 2 and precipitation concentrate zone 3.
Flocculation reaction zone 2
The pending liquid that comes from behind the thorough mixing of water channel 13 enters current stabilization district 21 by the bottom distributing hole, by the rectification of water distribution weir after inlet channel 22 enters mechanical flocculation zone 23, under the effect of agitator 25, high molecular polymer, backflow sedimentable matter uniform mixing, flocculation with adding produce alumen ustum uniformly densely.The alumen ustum that the machinery flocculation zone produces further increases in plug-flow flocculation zone 24 and is closely knit.
The design residence time suggestion of the pending liquid of blended in mechanical flocculation zone 23 for 10min～20min (minute), the preferred design residence time be 10min～15min (minute).
The dosage of high molecular polymer should be determined according to pending liquid water quality.
Precipitation concentrates zone 3
Pending liquid after the flocculation at first enters preliminary sedimentation district 31, behind this zone precipitation part suspended solids, enter holey disengaging zone 32, carry out separating of supernatant liquor and suspended solids, supernatant liquor enters filtration zone 4, the suspended solids of holding back enters enrichment region 33, strikes off collection device 34 at this bottom, district installing sedimentable matter, and sedimentable matter is concentrated, sedimentable matter after concentrating is back to mechanical flocculation zone 23 via an e Foerderanlage part, and a part is disposed to outside the system.
The design upflow velocity suggestion of holey disengaging zone 32 is 10m/h～30m/h (meter/hour), and preferred upflow velocity is 10m/h～20m/h (meter/hour).
Precipitation enrichment region 3 comprises:
Be provided with a water leg device that is used to collect supernatant liquor at an upper portion thereof, these devices are uniformly distributed in holey tripping device 32 tops;
Filtration zone 4
Supernatant liquor behind the coagulation enters water distributing area 41, and can add sulfuric acid, coagulating agent, and coagulating agent can be selected molysite or aluminium salt.Mixed supernatant liquor is introduced mill weir chamber 42, and current stabilization is laggard goes into body region 43, and mixed supernatant liquor carries out deep-bed filtration in body region 43, is collected after outlet system 44 enters next step treatment scheme by water gathering system of being located at this bottom, district.
The suggestion of filtrating area flow rate of liquid is 10～18m/h (meter/hour), and the preferred design flow velocity is 10-14.5m/h (meter/hour).
The mode of combined water and air backwash is adopted in the flushing of filtering material.
Equipment of the present invention as shown in Figure 1, concrete structure such as Fig. 2-shown in Figure 13 are one embodiment of the present of invention here: equipment of the present invention is by short mix zone 1, efficient settling pond and filtration zone 4.
Short mix zone 1
Short mix zone 1 specifically comprises into flooded zonevvv 16, water channel road 11, mixing zone 12 and goes out water channel 13, is provided with agitator 14 in the mixing zone 12, can make sewage, milk of lime, coagulating agent thorough mixing.Establish 1 suspended sediment concentration meter in the rapidly miscible pool 1,1 cover floating-ball level switch.
Efficient settling pond
Efficient settling pond comprises that flocculation reaction zone 2 and precipitation concentrate zone 3.
Flocculation reaction zone 2 mainly comprises current stabilization district 21, inlet channel 22, mechanical flocculation zone 23 and plug-flow flocculation zone 24; Be provided with agitator 25 in the wherein mechanical flocculation zone 23.
Precipitation concentrates zone 3 and mainly comprises preliminary sedimentation district 31, inclined tube disengaging zone 32 and enrichment region 33; Wherein enrichment region 33 bottoms are provided with mud scraper 34, are provided with V-type Sludge Bed 37 in the lower floor of mud scraper 34, and are provided with sedimentable matter return line 35 and sedimentable matter delivery pipe 36.
In concentrating zone 33, also be provided with mud level meter 38.
Sedimentable matter return line 35 and sedimentable matter delivery pipe 36 must be connected with sedimentable matter backflow/discharge equipment respectively.
Filtration zone 4
Filtration zone 4 mainly comprises
Supernatant liquor behind the coagulation enters water distributing area 41, mill weir chamber 42, body region 43 and exhalant region 44.Body region 43 has filtering material to carry out deep-bed filtration.
Backwash water inlet header and pressurized air distribution piping also are housed in the body region 43 of filtration zone 4.
Lime is joined the throwing system specialization
The powdery slaked lime is transported by closed tank truck, and strength is unloaded ash.Gas drains into atmosphere after being separated by the head space gas powder.The ash output hole place is provided with the stifled facility of anti-canopy.Wherein the lime powder feeding machine is selected import equipment for use, accurate measurement, and maintenance is little.
Dry powder metering, the concentration that changes lime slurry is to realize metering, and is accurately simple, and control easily is one of characteristics of native system.Like this, can keep pipeline sodalime breast under nominal flow rate, to move, with the line clogging of avoiding fluctuations in discharge to cause.Slaked lime powder enters feeding machine, and with metering lime powder amount, the feeding machine powder delivering amount adopts variable frequency adjustment, can be according to the proportional adjusting slaked lime powder of settling pond inlet flow rate dosage.
Slaked lime powder after the metering is delivered to the lime agitator tank via worm conveyor and vapour powder separator, and dry powder enters agitator tank, meets and separated at vapour powder separator with steam, and powder falls into case, and steam then drains into outside the case.Powder mixes, stirs, is dissolved into milk of lime with the clear water that enters from auxiliary water tank in agitator tank, is sent to by Lime Milk Transfer Pump to add a little.
Slaked lime is stored, metering, system breast, add and be the unit configuration, and each overlaps every settling pond with one, and Lime Milk Transfer Pump 100% is standby.
Whole process automatization control is another characteristics of native system.The vibrations hopper of lime silo blanking can regularly shake according to grey matter, to avoid fluffy stifled.But the start and stop of milk of lime dosing unit, Lime Milk Transfer Pump all program are operated.
All system and equipment are in the air-tight state operation, and the axle head of rotary machine etc. is located all to take appropriate measures, to alleviate wearing and tearing and to leak.
Claims (36)
1. the purifying method of recirculated cooling water or town B-grade sewage is characterized in that, pass through following several steps:
A. pending liquid is introduced short mix zone (1), add one or more reagent, and reagent and pending liquid are mixed;
The pending liquid that b. will mix carries out the high speed clarification in the high speed settling pond, the supernatant liquor that obtains is drawn;
C. above-mentioned supernatant liquor is introduced filtration zone (4), filling filtering material in the filtration zone (4).
2. the purifying method of recirculated cooling water according to claim 1 or town B-grade sewage is characterized in that, described step a. introduces short mix district (1) with pending liquid, and when adding a kind of reagent, this reagent is coagulating agent.
3. the purifying method of recirculated cooling water according to claim 1 or town B-grade sewage, it is characterized in that, described step a. introduces short mix zone (1) with sewage, and when adding plurality of reagents, this plurality of reagents can be lime medicament and one or more coagulating agent.
4. the purifying method of recirculated cooling water according to claim 1 or town B-grade sewage, it is characterized in that, after described pending liquid enters the mixing zone (12) of short mix zone (1), pending liquid designs the residence time in mixing zone (12) be 30～240 seconds, and the preferred residence time is 45～180 seconds.
5. the purifying method of recirculated cooling water according to claim 3 or town B-grade sewage, it is characterized in that, described lime medicament is by the lime device it to be joined in the short mix zone (1), and the lime device adopts dry powder metering, modular arrangements, whole process automatization control, airtight operation.
6. the purifying method of recirculated cooling water according to claim 5 or town B-grade sewage, it is characterized in that, described dry powder metering is the amount of directly measuring dry powder, realizes that by the dosage that changes dry powder the ratio of lime dosage and settling pond inlet water flow is regulated.
7. the purifying method of recirculated cooling water according to claim 5 or town B-grade sewage, it is characterized in that, described whole process automatization control, be that make up a prescription unit, milk of lime of milk of lime added the unit and control automatically, comprise automatic operation and automatic control cleaning etc., the vibrations hopper of setting the lime silo blanking is simultaneously avoided system jams according to regularly anti-clogging plug concussion of grey matter.
8. according to the purifying method of claim 2 or 3 described recirculated cooling waters or town B-grade sewage, it is characterized in that described coagulating agent can be a liquid polymerization ferric sulfate, dosage is 10～15 mg/litre.
9. the purifying method of recirculated cooling water according to claim 1 or town B-grade sewage, it is characterized in that, the pending liquid that described step b. will mix carries out the high speed clarification in the high speed settling pond, its high speed settling pond comprises that flocculation reaction zone (2) and precipitation concentrate zone (3), clarification comprises that the pending liquid that mixes is in the flocculation reaction of flocculation reaction zone (2) with in the rapid precipitation that precipitates concentrated zone (3) at a high speed.
10. the purifying method of recirculated cooling water according to claim 9 or town B-grade sewage, it is characterized in that, described flocculation reaction, be to adopt circulating granular to quicken flocculation to mixed uniform pending liquid, with multistage flocculation reaction, to reduce the best flocculation reaction time, its pending liquid is 10～20 minutes in this region design residence time, the preferred design residence time is 10～15 minutes, is 1/3～1/2 of the conventional flocculation reaction time.
11. the purifying method of recirculated cooling water according to claim 10 or town B-grade sewage, it is characterized in that, described employing circulating granular quickens flocculation, be after mixing with mechanical stirring device uniform pending liquid, with the partly precipitated material cycle utilize, with the interior sedimentation speed gradient in control flow velocity control flocculation reaction zone (2) at 250～450 seconds
-1Scope, and add high molecular polymer, to realize the further closely knit of flocculation reaction product, improve the settling velocity of flocculation reaction product.
12. the purifying method of recirculated cooling water according to claim 11 or town B-grade sewage is characterized in that, described mechanical stirring device adopts the axial flow agitator, and guiding device is set.
13. the purifying method of recirculated cooling water according to claim 10 or town B-grade sewage, it is characterized in that, described multistage flocculation reaction comprises secondary flocculation reaction at least, and first step flocculation reaction is mechanical flocculation reaction, and second stage flocculation reaction is the waterpower flocculation reaction.
14. the purifying method of recirculated cooling water according to claim 9 or town B-grade sewage is characterized in that, described high speed clarification, and the flow velocity that its supernatant liquor rises is 10～30 meters/hour, preferred upflow velocity is 10～20 meters/hour.
15. the purifying method of recirculated cooling water according to claim 9 or town B-grade sewage, it is characterized in that, described rapid precipitation, comprise treat treatment solution carry out preliminary precipitation handle, treat the sedimentable matter interface of treatment solution control, with the clarification of holey tripping device, the approximate settled control method of discrete particle.
16. the purifying method of recirculated cooling water according to claim 15 or town B-grade sewage, it is characterized in that, described sedimentable matter interface is controlled, be that the pending liquid after the flocculation is introduced precipitation enrichment region (3), the suspended solids of holding back enters enrichment region (33), and in precipitation concentrates zone (33), sedimentable matter is set and strikes off collection device, side device and sedimentable matter discharge equipment are visited in the sedimentable matter interface, and its sedimentable matter strikes off collection device and visits the signal control sedimentable matter discharge equipment that the side device provides according to the sedimentable matter interface, sedimentable matter strikes off the operation of collection device.
17. the purifying method of recirculated cooling water according to claim 15 or town B-grade sewage, it is characterized in that, described with the clarification of holey tripping device, be that pending liquid is risen by holey tripping device (32), obtain supernatant liquor, the hydraulic radius of holey tripping device, mounting height can be determined according to the water-quality guideline of treatment solution.
18. the purifying method of recirculated cooling water according to claim 15 or town B-grade sewage, it is characterized in that, the settled control method of described approximate discrete particle is to concentrate the Reynolds number in zone (33) and solid surface load and make solid particles sediment speed after the flocculation reaction near the discrete particle settling velocity by adjusting precipitation.
19. the purifying method of recirculated cooling water according to claim 15 or town B-grade sewage is characterized in that, described high speed settling pond, and the sedimentable matter concentration of its discharging can reach 20～100mg/L, can directly dewater, and need not concentration.
20. the purifying method of recirculated cooling water according to claim 1 or town B-grade sewage, it is characterized in that, described step c is introduced filtration zone (4) with above-mentioned supernatant liquor, be filled with the filtering material of porosity in the filtration zone (4) along Cheng Bianhua, be the water distributing area (41) of earlier above-mentioned supernatant liquor being introduced filtration zone (4), enter influent weir chamber (42), filtration zone (4) body region (43) and outlet system (44) more successively; Supernatant liquor carries out deep-bed filtration in filtration zone (4) body region (43).
21. the purifying method of recirculated cooling water according to claim 1 or town B-grade sewage is characterized in that, the design current velocity of the filtration zone of described step c (4) is 10～18 meters/hour, and the preferred design flow velocity is 10～14.5 meters/hour.
22. the purifying method of recirculated cooling water according to claim 20 or town B-grade sewage is characterized in that, described water distributing area (41) can add sulfuric acid or/and coagulating agent, and thorough mixing.
23. the purifying method of recirculated cooling water according to claim 20 or town B-grade sewage is characterized in that, the body region (43) of described filtration zone (4), and porosity of the filtering material of filling is along Cheng Bianhua in it.
24. the purifying method of recirculated cooling water according to claim 23 or town B-grade sewage is characterized in that, the washing of described filtering material can be adopted the mode of combined water and air backwash.
25. the purifying method of recirculated cooling water according to claim 20 or town B-grade sewage is characterized in that, described filtration zone 4 body region (43) adopt permanent liquid level drag flow deep-bed filtration.
26. the purifying method of recirculated cooling water according to claim 22 or town B-grade sewage is characterized in that, described coagulating agent can be molysite or aluminium salt.
27. the treating plant of recirculated cooling water or town B-grade sewage, it is characterized in that, it mainly comprises and is positioned at short mix zone (1), high speed settling pond and filtration zone (4), short mix zone (1) and at a high speed between the clarification, have water channel to connect between high speed settling pond and the filtration zone (4).
28. the treating plant of recirculated cooling water according to claim 27 or town B-grade sewage is characterized in that, described high speed settling pond can be divided into flocculation zone (2) and precipitation enrichment region (3).
29. the treating plant of recirculated cooling water according to claim 28 or town B-grade sewage, it is characterized in that, described flocculation zone (2) comprises current stabilization district (21), inlet channel (22), mechanical flocculation zone (23) and plug-flow flocculation zone (24) again successively, and agitator (25) is arranged in the wherein mechanical flocculation zone (23).
30. the treating plant of recirculated cooling water according to claim 28 or town B-grade sewage is characterized in that, described precipitation enrichment region (3) top is provided with the holey tripping device, and precipitation enrichment region (3) bottom is provided with sedimentable matter and strikes off collection device.
31. the treating plant of recirculated cooling water according to claim 30 or town B-grade sewage is characterized in that, the top that the sedimentable matter of described precipitation enrichment region (3) strikes off collection device is connected with the sedimentable matter discharge equipment.
32. the treating plant of recirculated cooling water according to claim 27 or town B-grade sewage is characterized in that, described filtration zone (4) mainly comprises water distributing area (41), influent weir chamber (42), body region (43) and exhalant region (44).
33. the treating plant of recirculated cooling water according to claim 32 or town B-grade sewage, it is characterized in that, described body region (43) is a drag flow deep-bed filtration device, promptly is provided with filtering material and supporting layer in the body region (43), under the supporting layer water and air distributing device is housed.
34. the treating plant of recirculated cooling water according to claim 32 or town B-grade sewage is characterized in that, described body region (43) also comprises the washing and filtering device, discharges the constant fluid level control device of filtered liquid.
35. the treating plant of recirculated cooling water according to claim 32 or town B-grade sewage is characterized in that, is provided with the suspended sediment concentration meter in the described short mix zone (1).
36. the treating plant of recirculated cooling water according to claim 27 or town B-grade sewage is characterized in that, is provided with one or more reagent dispensers in the described short mix zone (1).
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