CN102267797B - Integral process for ecologically desilting and curing sludge - Google Patents

Integral process for ecologically desilting and curing sludge Download PDF

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CN102267797B
CN102267797B CN 201110208479 CN201110208479A CN102267797B CN 102267797 B CN102267797 B CN 102267797B CN 201110208479 CN201110208479 CN 201110208479 CN 201110208479 A CN201110208479 A CN 201110208479A CN 102267797 B CN102267797 B CN 102267797B
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mud
sludge
water
agent
concentration basin
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CN 201110208479
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CN102267797A (en
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倪守高
高扬
朱伟
张国刚
王俊泽
凌嘉穗
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中国船舶重工集团公司第七○二研究所
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Abstract

The invention discloses an integral process for ecologically desilting and curing sludge. The process comprises the following treatment steps of: I, absorbing riverbed sludge in an undistributed way; II, pretreating landed slurry based on high-frequency oscillation; III, decreasing and concentrating slurry-containing sewage while adding a flocculating agent A; IV, performing solid-liquid separation on the concentrated slurry, conveying the concentrated slurry in a decreasing and concentrating pond to a horizontal centrifuge, adding a flocculating agent B and centrifuging to obtain dehydrated slurry cakes; V, inputting the dehydrated slurry cakes into curing equipment, adding a curing agent to obtain cured sludge, introducing sewage drained from the centrifuge into an adjusting pond, adding a flocculating agent C, homogenizing, blending, elevating to a purifying tower through an elevating pump, and adding a flocculating agent D; and VI, making a purified liquid part drained from the purifying tower reflow for utilizing, and making precipitated concentrated slurry reflow to the decreasing and concentrating pond for retreating. The integral process has the advantages of high desilting efficiency, low cost, no secondary pollution, small floor area, and detachability and assembly for rapid transition.

Description

A kind of ecological dredging and sludge solidification are disposed integral process
Technical field
The present invention relates to water conservancy and field of Environment Protection, particularly relate to ecological dredging, the sludge dewatering and solidifying of riverbed sludge and contain dirt water field of purification.
Background technology
According to the statistics made by the departments concerned, approximately more than 50 hundred million tons in the soil that China runs off every year on average, the surface soil layer major part about 1 centimetre will slowly flow into rivers and lakes, be subjected to land area that the rivers Sediment Siltation affects up to 1,000,000 mu.Because Sediment Siltation causes reservoir to dwindle, the water yield of national reservoir is stocked loss and has been reached 200 billion cubic meters, and the shipping mileage narrows down to present 110,000 kilometers by original 140,000 kilometers.With regard to the particular case of lake, river, the serious Sediment Siltation of China's rivers and lakes is not limited only to lake surface and has dwindled nearly 1/3 Dongting Lake, the Taihu Lake in middle and lower reaches riverbed, the Yellow River, Jiangsu and the Dian Chi in Yunnan etc. all obviously show the trend of " Sediment Siltation clearly ".The Taihu Lake silted by mud and sand, one meets flood, and barrier line is just high, and the relevant expert points out, and Sediment Siltation reduces regulating pondage, and flood outbreak riverbed water level is just high, same flow, one to the downstream, and pressure of flood is just large; Weakening of reservoir filling ability equally also makes the possible pressure that is brought by flood more much bigger than originally; The shipping ability is with Sediment Siltation and shipping contraction in length and weaken gradually.Harbour, harbour all spend because of desilting seriously every year.
In addition, in recent years because the lake water quality pollution, pollution substance accumulation in the Sediments is serious, nitrogen wherein, phosphorus, organic equal size are relatively high, and under the effect of lake current, fail and move, spread, deposit, simultaneously in the lake development and use and biological residual body also to the certain pollution effect of bed mud generation, thereby for the general outburst of blue-green algae and lake provides necessary nutritive element, so to the removing of the riverbed sludge particularly urgent eyelash that just seems.
" ecological dredging " is a kind of completely new concept; it is take restoration of the ecosystem as final purpose; when removing pollutants in sediments to greatest extent; for the intervention of follow-up biotechnology creates conditions; be an important step of Ecological Restoration Project in the water resources protection, be different from traditional " dredging " and " dredging ".The purpose of " dredging " and " dredging " is for dredging channel or increases capacity reservoir, and the purpose of ecological dredging is the rich nutritive material that is deposited on lakebed (river bed) in order to remove, and comprises the soft shape settling (mud) of high nutrient contg and the floss of half suspension (algae remains and dormancy shape live body algae etc.) thereby the basic component of repairing the ecology exchange layer.On the basis of ecological dredging, by integration engineering and non-engineering measures such as engineering measure, environmental improvement, ecological engineering and management, repair the ecosystem, ensure lake, river life and health and Sustainable development.
From technology, equipment and mode of operation, current still take traditional dredging, dredging plant as main.Although this simple desilting mode can be removed mud from the lake, river, but the desilting modes such as excavation, strand suction are because the existence of turning unit, in the inevitable operation diffusion of mud in water body with spread unchecked, particularly the muck surface deadlocked layer that comprises a large amount of rich nutritive materials can distribute, be difficult to be dug out with mud, cause like this secondary pollution in the desilting process, so that the desilting process is not thorough, sometimes also can further increase the weight of the eutrophication of water body.Therefore, how realizing " ecological dredging ", " science desilting ", avoid the secondary pollution in the desilting process, is that first difficult problem that lake surface faces is controlled in desilting.
At present in the desilting of lake, river, the method for disposal of disembarkation mud is adopted the stockyard mostly.Practice shows, the stockyard not only takies a large amount of land resourcess, and consuming time very long, stacking reaches the disembarkation mud in 3 years, although the surface is dry, large quantity of moisture is still contained in inside, be stream and mould shape, do not have bearing capacity, be difficult in heaps, and can cause secondary pollution to air, groundwater resource in stacking process.In addition, the extensive desilting in similar Taihu Lake, so measuring large mud, to rely on that the stacking that reaches the several years disposes be unpractical.
For the concentrated structures of precipitation, according to its water inlet direction, mainly be divided into advection, perpendicular stream and width of cloth flow settling pond, these settling tanks all need to scrape slag equipment; The rectangular sedimentation tank surface-area is larger, takes up an area greatlyr, does not satisfy the demand of desilting place miniaturization; Perpendicular stream and width of cloth flow settling pond complex structure, cost is high, and long construction period is not suitable for the demand that normal desilting is disposed needs transition.
Application number is that 201010242782.1 Patent Application Publication discloses a kind of underwater mud dehydrating and curing device and method, and treatment step and equipment that it mainly adopts are successively: vibratory screening apparatus pre-treatment, belt filter press filter and obtain dehydrated sludge cake, scavenging tower and whizzer series connection and purify the sewage that belt filter press is discharged.
The problem that this documents exists is: the mud that obtains after the vibratory screening apparatus pre-treatment has directly entered belt filter press, the amount of sludge that comprises in this mud and sewage quantity are all very large, cause when belt filter press is processed, the pressure that produces when same strainer compresses should compress mud, make wherein moisture penetration out, filter again a large amount of sewage, so just, the effective compression pressure that has disperseed strainer, so that the mud cake water content of discharging from the discharge port of pressure filter is still larger, can't directly use.Simultaneously, the treatment step of half and relevant device in the documents (being scavenging tower and whizzer) all are the purifying treatment of carrying out for the sewage that obtains after the vibratory screening apparatus processing, the invention of this documents focuses on remaining sewage behind the sludge dewatering is purified it can be seen, and only used vibratory screening apparatus and these two links of pressure filter for sludge dewatering, the treatment effect deficiency is so that sludge solidification, sclerosis, re-using.
Summary of the invention
The problems referred to above for prior art, the invention provides a kind of ecological dredging and sludge solidification and dispose integral process, comprise that the undisturbed of riverbed sludge is drawn, mechanical thickening, the secondary-cleaned of Yu Shui and the steps such as curing outward transport of dehydrated sludge cake of disembarkation mud.The present invention has the advantages such as desilting efficiency data is high, cost is low, floor space is little, operation whole process mud does not land, need not the stockyard, non-secondary pollution, system's mobility strong, the quick transition of detachable assembling.
Technical scheme of the present invention is as follows:
A kind of ecological dredging and sludge solidification are disposed integral process, and treatment step is as follows:
The first step: obtain underwater mud;
Second step: adopt filter sieve that mud is carried out pre-treatment, large solid refuse is wherein separated, the remaining dirt water that contains enters next joint processing unit;
The 3rd step: the dirt water that contains that obtains after the upper joint processing is passed into the decrement concentration basin, and add flocculating agent A in the ingress of decrement concentration basin, obtain concentrated mud after will processing through the decrement concentration basin and enter next joint processing unit;
The 4th step: the concentrated mud that obtains after the upper joint processing is transported into horizontal centrifuge, and adds flocculating agent B in the ingress of whizzer, concentrate the centrifuge dehydration of mud;
The 5th step: the dehydrated sludge cake that obtains after the upper joint processing is transported into curing apparatus, adds solidifying agent, obtain curing sludge; The sewage that obtains after the upper joint processing is passed into equalizing tank, and add flocculation agent C in the equalizing tank ingress, the sewage of discharging from equalizing tank enters scavenging tower, and adds flocculation agent D in the ingress of scavenging tower;
The 6th step: a upper joint is processed the rear scavenging solution partial reflux utilization that obtains from scavenging tower; The concentrated mud that obtains after the upper joint processing is back to the decrement concentration basin to be processed again.
Wherein the first step is obtained underwater mud and is adopted ecological dredging jet pump.
Described decrement concentration basin is along 2 ~ 10 storages of pond length direction series connection bucket, and each storage bucket middle part arranges suction pipe, and the suction pipe bottom arranges whipping appts; Contain dirt water and enter flocculation sediment behind the decrement concentration basin, be deposited on and be disposed to next joint processing unit after concentrated mud in the storage bucket is drawn by suction pipe, the clear liquid that is positioned at body mud enrichment region top, pond is then discharged from the water outlet of decrement concentration basin afterbody.
Described flocculating agent A is polymerize aluminum chloride (PAC), and addition is 100 ~ 150ppm.Described flocculating agent B is anionic polyacrylamide (APAM), and addition is 50 ~ 100ppm.Described flocculation agent C is polymerize aluminum chloride (PAC), and addition is 25 ~ 45ppm.Described flocculation agent D is cationic polyacrylamide (CPAM), and addition is 1 ~ 3ppm.
Solidifying agent comprises silicate cement, modified coal ash, fine sand, calcium sulfate described in the 5th step; The quality of described modified coal ash is 5 ~ 7% of silicate cement quality; The particle diameter of described fine sand is 0.63 ~ 1.25mm, and quality is 1 ~ 3% of silicate cement quality; The quality of described calcium sulfate is 0.6 ~ 1.4% of silicate cement quality; The preparation method of described modified coal ash is: flyash 280 ~ 320 ℃ of lower roastings 40 ~ 70 minutes, is taken out cooling, and sealing saves backup.The usage quantity of solidifying agent is 3 ~ 7% of dehydrated sludge cake quality described in the 5th step.
The present invention is take the Patent Application Publication of application number as 201010242782.1 as the basis, the improvement of carrying out invention.The present invention makes improvements and place with marked improvement is than this documents:
The present invention uses as the sludge solidification step with decrement concentration basin, whizzer and sludge solidification devices in series, has replaced the belt filter press in the documents.Entered the decrement concentration basin through the mud that obtains after the vibratory screening apparatus processing, mud precipitates in the pond, and supernatant liquor is discharged from overflow weir; The mud concentrated through precipitation is promoted to lower joint equipment by suction pipe through lift pump, and at this moment, the moisture in the mud reduces in a large number, and water content drops to 75% ~ 85%; This mud directly put into be delivered to whizzer and carry out centrifuge dehydration, dehydrated sludge cake water content after centrifugal further is low to moderate 30% ~ 45%, its input sludge solidification equipment is cured modification, obtain having the curing sludge of some strength, by banking up of certain hour, after it possesses some strength, can directly utilize, as backfill earthwork etc.The supernatant liquor of discharging from concentrated decrement pond directly discharges, and also can enter equalizing tank and scavenging tower with the parting liquid of whizzer and carry out the dirty water decontamination handles, and the scavenging solution discharge water that obtains meets the one-level B standard among the GB18918-2002.And in the sludge dewatering stage, whizzer is compared to belt filter press, and the concentration of its charging is high, and water separation capability is strong, has improved the quality of sludge dewatering and the utilising efficiency of number of devices.
Simultaneously, because mud layer thickness, dredger gait of march and removing sludge are imbedded the difference of the mud layer degree of depth under water, the concentration of mud of causing debarking changes constantly, meanwhile the chemical feeding quantity of flocculation agent etc. also should be regulated and control constantly, and the mud decrement concentration basin among the present invention has just played the effect of adjusting, homogeneous sludge concentration, so that next joint processing unit operation is more stable.
Can find out from invention thinking of the present invention, the present invention has taken into account ecology absorption, sludge dewatering and solidifying and the sewage purification three link of bed mud, by a whole set for the treatment of scheme of the present invention, both obtained having the curing sludge of some strength, having got back meets the discharge water of national standard.Than documents, processing mode of the present invention is horn of plenty and perfect more, and the flow process of design is more reasonable, the requirement of the final more realistic production of technical problem that solves.
Description of drawings
Fig. 1 is connection and the operation schematic diagram for the treatment of unit of the present invention.
Fig. 2 is the main pseudosection of jet-pump among Fig. 1.
Fig. 3 is the front view of vibratory screening apparatus among Fig. 1.
Fig. 4 is the main pseudosection of decrement concentration basin among Fig. 1.
Fig. 5 is the main pseudosection of the whizzer among Fig. 1.
Fig. 6 is the front view of sludge solidification equipment among Fig. 1.
Fig. 7 is the main pseudosection of equalizing tank among Fig. 1.
Fig. 8 is the front view of scavenging tower among Fig. 1.
Embodiment
Below in conjunction with description of drawings the specific embodiment of the present invention.
As shown in Figure 1, sludge dewatering and solidifying of the present invention and sewage purification process, its treatment facility comprises in the jet-pump 100 that is connected in series by pipeline and transferpump, the vibratory screening apparatus 200, decrement concentration basin 300, whizzer 400, go out to tell the two-way pipeline from whizzer 400, wherein a-road-through is to sludge solidification equipment 500 and automobile outward transport place 904 that is attached thereto, equalizing tank 600, the scavenging tower 700 of series connection led on another road, and the clean water basin 901 that are attached thereto.Ingress at described decrement concentration basin 300, whizzer 400, equalizing tank 600 and scavenging tower 700 is respectively arranged with flocculant concentration equipment 801,802,803,804.
Sludge dewatering and solidifying of the present invention and sewage purification process comprise following six treatment steps.
The first step: the undisturbed that adopts jet-pump 100 to carry out underwater mud is drawn.As shown in Figure 2, the jet-pump 100 that adopts among the embodiment is in 200910027292.7 the patent documentation disclosed a kind of " ecological dredging jet pump " for the applicant at application number.
Its specific works mode is: outside water pump enters high pressure distribution cavity 105 with the clear water on water surface upper strata by jet inlet pipe 106, in high pressure distribution cavity 105, carry out the distribution of water, with efflux nozzle 109 of water extraction supply and secondary jet spout 108, thereby produce the twice jet.The secondary jet spout 108 of bottom forms the bottom that high-speed jet is ejected into jet-pump 100, and the Main Function of this jet is to pulverize bottom bed mud to be removed, and forms mud.According to hydromechanical Coanda effect, fluid mud enters and flows along streamlined horn body 107, and does not separate.An efflux nozzle 109 on top also forms high-speed jet, entrainments following low-pressure fluid.
Acting in conjunction by above-mentioned twice jet, fluid mud is inhaled into doping section 104 along streamlined horn body 107, in the 104 interior generation mass-energy exchanges of doping section, the kinetic transformation of water is the kinetic energy of mud, then enter and mix section 103, water, mud mix the uniform mixed stream of formation flow velocity.By diffusion section 102, kinetic transformation is pressure energy, thereby mud is exported by outlet section 101.
Jet-pump adopts hydromeehanics Coanda effect principle, integrates bed mud and pulverizes and absorption, has effectively avoided conventional dredging plant when operation, because the rotation of component under water to the disturbance diffusion that bed mud causes, has been stopped the generation of secondary pollution.
Second step: adopt 200 pairs of disembarkations of vibratory screening apparatus mud to carry out pre-treatment, as shown in Figure 3.In the desilting in lake, river, dredging engineering, solid refuse and impurity in the bed mud are more, must just can carry out follow-up sludge dewatering through pre-treatment.The principle of work of vibratory screening apparatus is that two motor synchronous backwards rotations makes vibrator produce reverse exciting force, forces sieve nest to drive screen cloth and does longitudinal motion, makes material on it be subjected to exciting force and the process of periodically dishing out forward, thereby finishes the screening of material.
Its specific works mode is: the top of frame 201 is provided with the screen cloth 204 of inclination, and screen cloth 204 is up-down vibration under the effect of vibratory pump 203.Enter buffer tank 202 from the mud that contains the solid rubbish of jet-pump water exit end 101 outputs, flow on the screen cloth 204 from the bottom of buffer tank 201, liquid wherein and small particle size mud fall by the sieve aperture of screen cloth 204, and under the stirring action of bottom stirrer 205, further mix, and flow out from water outlet 206; Oarse-grained solid refuse and impurity can not pass through sieve aperture, but move downward along the inclined-plane of screen cloth 204, finally are separated.
In addition, the filter sieve such as employing roller grizzly also can be finished this pre-treatment step, are used for the large solid impurity of initial gross separation muddy water; But vibratory screening apparatus provides reverse exciting force by vibratory pump, and the mesh of its screen cloth is difficult for resulting in blockage in preprocessing process, has saved the time of back flushing, has improved processing efficiency.
The 3rd step: the dirt water that contains that flows out from the water outlet 206 of vibratory screening apparatus 200 mixes with the flocculating agent A of flocculant concentration equipment 801 outflows, together enters the water-in 301 of decrement concentration basin 300, as shown in Figure 4.Its principle of work is: through after the containing dirt water and enter concentration basin of dosing, along continuous straight runs is sluggish flow in the pond, mud precipitates at the bottom of the pond, sewage is the sedimentation layering under less hydraulic disturbance, supernatant liquor is discharged in the water side, pond, two processes of silt deposit and clarifying contaminated liquids are carried out simultaneously, do not interfere with each other.Being provided with a plurality of storage buckets in pond entrance end bottom along the pond length direction, is the main build-up areas behind the concentrated mud sediment, is provided with the spoil disposal pipeline in each storage bucket, can mud be transported into next joint processing unit by the mode of extraction or static pressure spoil disposal.
Its specific works mode is: enter the mixture of water-in 301 successively by inlet damper 302 and perforated wall 303, flow into the storage bucket 306 of six series connection.Storage bucket 306 is the little truncated rectangular pyramids type in mouthful large end, flocculating agent A is impelled the mud flocculation and is deposited in the storage bucket 306, the centre of each storage bucket 306 is provided with suction pipe 304, the bottom of suction pipe 304 is provided with undercurrent whipping appts 305, whipping appts 305 stirring at low speed prevent that concentrated mud from hardening, and stops up suction pipe.Suction pipe 304 passes into whizzer 400 with the mud sucking-off that sinks to the bottom; The clear liquor on storage bucket 306 tops directly drains into the lake, river successively by except slag chute 307, water outlet baffle plate 308, overflow weir 309 and rising pipe 310.
Above-mentioned inlet damper 302 and perforated wall 303 had not only played the energy dissipating effect of current but also had prevented overflow phenomena, all right rectification and water distribution, prevented that strong flow shear from destroying the alumen ustum that has produced in the water, concentrate so that the mud granule in the water precipitates under less current delivery power faster, improved thickening efficiency.Except slag chute 307, water outlet baffle plate 308, overflow weir 309 can make a small amount of impurity that is mixed in the supernatant liquor be retained down, pass back into storage bucket 306 and continue flocculation sediment.
Process the concentrated mud that obtains through the decrement concentration basin and abandoned large quantity of moisture, its effective volume reduces, and can improve the utilization ratio of processing unit of lower step, has reduced processing cost; The clarifying process of the sewage in the pond also carries out at the same time, and the supernatant liquor of qualified discharge overflows by the overflow weir of pond end, has finished the water-break process, has avoided the repeatedly processing of clear liquid, has also reduced processing cost; In addition, the decrement concentration basin is not established and is scraped slag equipment and structural form thereof, and floor space is little, and structure is relatively simple, and short construction period and sedimentation effect are good, all greatly reduces cost in operation and construction, is fit to desilting and the mud handling project of rapidly transition.
The 4th step: with after the flocculating agent B of outflow the flocculant concentration equipment 802 is mixed, enter the water-in 401 of whizzer 400, as shown in Figure 5 from the concentrated mud of suction pipe 304 sucking-offs.After its cardinal principle was that muddy water injects rotary drum, rotary drum is high speed rotating under extraneous transmission apparatus drives, and drove that mud rotates with it in the cylinder, because the density variation of different components causes the centrifugal force that produces different in the mud, thereby reached the purpose of separation.
Its specific works mode is: whizzer 400 is provided with same rotary middle spindle in frame, with rotating cylinder 406 and the spiral conveyer of sense of rotation, spiral conveyer is comprised of hollow spindle 403 and the blade 405 that is fixed in main shaft 403 outer circumference surfaces, low speed rotation under its driving wheel 402 that arranges in the end drives, and while rotating cylinder 406 high speed rotating.The mixture that flows into water-in 401 enters hollow spindle 403 inner chambers, throw away to the space between main shaft 403 and the rotating cylinder 406 by the some dispensing orifices 404 that distribute on the main shaft, because spiral conveyer and rotating cylinder 406 rotating Vortexes, but rotating speed is different, the dehydrated sludge cake that proportion is larger is got rid of to the inner side-wall of rotating cylinder 406, and terminal down to spiral conveyer in the propelling movement of blade 405, to discharge by mud discharging mouth 408, the parting liquid that proportion is less is then discharged from the water port 407 of the other end.Before this step, add flocculation agent, concentrated mud is flocculated rapidly unite, strengthened the proportion of mud phase in the water, the mud in the sewage further is separated.
Whizzer it is advantageous that as water treating equipment the equipment occupation of land is less, efficient is high, simple to operate, level of automation is high.In addition, whizzer is compared to other solid-liquid separating equipments (such as belt filter press), and the concentration of its charging is higher, has guaranteed the treatment capacity of concentrated mud.
The 5th goes on foot first part: the dehydrated sludge cake of discharging from the mud discharging mouth 408 of whizzer 400 enters in the mud bucket 501 of sludge solidification equipment 500.As shown in Figure 6, be provided with solidifying agent filler bin 502 on sludge solidification equipment 500 overhead, what wherein place is the solidifying agent that has configured.This solidifying agent falls into powder screw 503 from the outlet at bottom of solidifying agent filler bin 502, is transported to powder metering bucket 504, is cured the weighing of agent at this.According to the weight of mud in the mud bucket 501, take by weighing and account for a certain proportion of solidifying agent of this mud weight, the complete solidifying agent of weighing falls into the powder screw 505 of powder weighing bucket 504 bottoms, is transported to a mixing bowl 506 of mud bucket 501 belows.Dehydrated sludge cake and the solidifying agent of discharging from the mud discharging mouth 408 of whizzer 400 stir in a mixing bowl 506, mix, and in the process that stirs physicochemical change occur, and mud is cured, and its intensity improves.Curing sludge is delivered to the finished product hopper 508 that is positioned at automobile outward transport place 904 by finished product material conveyor 507, then fall into the automobile wagon box that outward transport is waited in finished product hopper 508 belows, transports outward.Bank up and to realize recycling after for some time, as being used for the backfill earthwork.
Cement composition in the solidifying agent and the moisture generation hydration reaction in the mud generate the crystal gel, will be harmful to the mud particulate and contain respectively, and progressively sclerosis forms solidified cement body; Fine sand has improved the grain grade proportion of dewatered sludge as aggregate, has reduced voidage, has further promoted the intensity of curing sludge, and has reduced the consumption of cement in the solidifying agent; Be rich in the flyash with activating oxide SiO 2And Al 2O 3It is main granulated glass sphere, a small amount of metal oxide and unburnt carbon, its specific surface area is larger, surface energy is high, to many pollution substances, especially heavy metal ion and organism have stronger adsorption, by the thermal treatment activation modification to flyash, flyash can lose zeolite water and the crystal water in the duct, the quantity of its inner duct area and activated adsorption point is increased, and then improved the absorption property of flyash, and utilizing these good performances, activating fly ash is in the aggregate as dewatered sludge, can as sorbent material enriching heavy metal ion and organism, reduce secondary pollution again; Calcium sulfate (CaSO 42H 2O) can with the tricalcium aluminate (3CaOAl that contains in the cement 2O 3) react, generating ettringite, this reaction can improve the early strength of dewatered sludge when solidifying, and has accelerated the sclerosis of dewatered sludge, has effectively shortened the time that the curing sludge that obtains after dewatered sludge is solidified reaches intensity.
The 5th step second section: the parting liquid of discharging from the water port 407 of whizzer 400 mixes with the flocculation agent C that flocculant concentration equipment 803 flows out, and enters in the inlet flume 601 of equalizing tank 600.As shown in Figure 7, the mixture that enters inlet flume 601 carries out hybrid concurrency at reaction zone 602 and gives birth to flocculation reaction, slowly by perforated wall 603, enters in the storage bucket 608 of three series connection of equalizing tank 600, and the storage bucket is the little truncated rectangular pyramids type in mouthful large end.Mud in the parting liquid is through flocculation reaction, in storage bucket 608, settle down, the centre of each storage bucket 608 is provided with suction pipe 604, suction pipe 604 bottoms are provided with whipping appts 605, and whipping appts 605 can impel flocculation agent and sewage fully to react and prevent that mud from piling up hardening of causing.Suction pipe 604 is with the mud sucking-off that sinks to the bottom, and supernatant liquor enters by flow-stopping plate 606 and receives tank 607, directly drains into the lake, river.Wherein, through the processing of several unit, front, the mud quantity that sinks to the bottom in this step is few, so suction pipe 604 absorptions is the sewage that contains a small amount of mud.
Mix with the flocculation agent D that flocculant concentration equipment 804 flows out from the sewage that contains a small amount of mud of suction pipe 604 sucking-offs, the inlet gate valve 701 by scavenging tower 700 enters retort 702 and fully mixes.As shown in Figure 8, mix complete after, enter knockout tower 704 from the outlet conduit 703 at retort 702 tops.When equipment is initially debugged, be arranged at the water sample of pipeline 705 derivation of different heights by observation, know the response situation in the knockout tower 704, thereby can regulate chemical feeding quantity; After equipment debugging finishes continuously operation for some time, to purify waste water and discharge from the water outlet 706 of cat head, this moment, effluent quality was better, met the one-level B standard among the GB18918-2002; Mud through sedimentation at the bottom of tower is discharged by bottom mud mouth 707.
Adopt scavenging tower as the secondary-cleaned equipment of remaining water, it is equivalent to a movably settling tank, utilizes the principle of flocculation sediment, gravity separation, dynamic filtration to carry out work.Scavenging tower not only can reach the effect of settling tank, and floor space little, reduce investment outlay, do not need to build the pond and be equipped with the special-purpose mud equipment of scraping, handiness is high, is not limited to point of fixity and uses.
The 6th step: as shown in Figure 1, water outlet 706 the purifying waste water of discharge of scavenging tower 700 are entered in the clean water basin 901, wherein a part refluxes by flushing water pump 902 and utilizes: the one, be back to four flocculant concentration equipment 801,802,803,804, solvent as the dissolving flocculation agent, the 2nd, be back to the ingress of whizzer 400 and the ingress of knockout tower 704, as the backwash water.Remaining is purified waste water and can directly be disposed to the lake, river in the clean water basin 901.
The concentrated mud of discharging from the mud mouth 707 of scavenging tower 700 is back to decrement concentration basin 300 to carry out second and takes turns processing.The backflow route that represents concentrated mud this step among Fig. 1 from the dotted line of mud mouth 707s.
Control valve 903s from the water port 407 that is connected in whizzer 400 among Fig. 1 have an other dotted line to pass into decrement concentration basin 300, this dotted line represent if the parting liquid of discharging from the water port 407 of whizzer 400 to contain amount of sludge higher, can directly it be back to decrement concentration basin 300 by control valve 903 control and carry out flocculating second time and sink to the bottom processing, and not enter equalizing tank.The advantage that arranges like this is to control the silt content in the sewage that enters equalizing tank 600 and scavenging tower 700, and its operating pressure is reduced, and has guaranteed the quality of the water of final inflow clean water basin 901, has also reduced whole cost of water treatment.
In the process of above-mentioned sludge dewatering and solidifying and sewage purification, the amount of the flocculating agent A of interpolation, B, C, D is as shown in table 1:
Table 1
In the table 1, PAC is inorganic coagulant, when being added to a certain threshold value, and the rapid Precipitation of its hydrolysate, the micelle in the water and fine suspension can be caught as nucleus or absorption net when forming by these throw outs, become tiny flco; APAM and CPAM are organic polymer coargulator, and it is the water-soluble long-chain compound, ionize out a large amount of dissociable groups when hydrolysis, thereby catch the effect that tiny flco plays flocculation by electrical neutralization, bridge formation adsorption net.
In the process of above-mentioned sludge dewatering and solidifying and sewage purification, used solidifying agent comprises silicate cement, modified coal ash, fine sand, calcium sulfate.Wherein the quality of modified coal ash is 6% of silicate cement quality, and the quality of fine sand is 2% of silicate cement quality, and the quality of calcium sulfate is 1% of silicate cement quality.The preparation method of modified coal ash is: flyash was obtained 300 ℃ of lower roastings in 60 minutes.The label of used silicate cement is 32.5, and the particle diameter of fine sand is 0.63 ~ 1.25mm.
When this solidifying agent mixed with mud, the usage quantity of solidifying agent was 4% of mud quality.
In the process of above-mentioned sludge dewatering and solidifying and sewage purification, the undressed dirt water that contains sees Table 2 with the water quality that different water port are discharged water.
Table 2
As can be seen from Table 2, the supernatant liquor that the decrement concentration basin is discharged satisfies the grade III Standard of GB18918-2002, and the supernatant liquor that equalizing tank is discharged satisfies the secondary standard of GB18918-2002, and the water quality of scavenging tower discharge water meets the emission standard of GB18918-2002 one-level B.
Above description is explanation of the invention, just sets forth preferably embodiment of the present invention, is not the restriction to invention, in the situation that without prejudice to invention spirit, the present invention can do any type of modification, be equal to replacement, improvement etc.Such as adopting other flocculation agents such as biological flocculant, perhaps replacing the decrement concentration basin with width of cloth streaming concentration basin, to carry out mud concentrated, also or raise the terrace absolute altitude of decrement concentration basin, and mud storage pool is set before it, adopts the mode of static pressure spoil disposal to store concentrated mud etc.

Claims (8)

1. an ecological dredging and sludge solidification are disposed integral process, it is characterized in that treatment step is as follows:
The first step: obtain underwater mud;
Second step: adopt filter sieve that mud is carried out pre-treatment, large solid refuse is wherein separated, the remaining dirt water that contains enters next joint processing unit;
The 3rd step: the dirt water that contains that obtains after the upper joint processing is passed into the decrement concentration basin, and add flocculating agent A in the ingress of decrement concentration basin, obtain concentrated mud after will processing through the decrement concentration basin and enter next joint processing unit;
The 4th step: the concentrated mud that obtains after the upper joint processing is transported into horizontal centrifuge, and adds flocculating agent B in the ingress of whizzer, concentrate the centrifuge dehydration of mud;
The 5th step: the dehydrated sludge cake that obtains after the upper joint processing is transported into curing apparatus, adds solidifying agent, obtain curing sludge; The sewage that obtains after the upper joint processing is passed into equalizing tank, and add flocculation agent C in the equalizing tank ingress, the sewage of discharging from equalizing tank enters scavenging tower, and adds flocculation agent D in the ingress of scavenging tower;
The 6th step: the scavenging solution partial reflux utilization that obtains from scavenging tower after a upper joint processed, the direction of described backflow utilization is: as the solvent of dissolving flocculating agent A, B, C, D, and as the backwash water of whizzer and scavenging tower; The concentrated mud that obtains after the upper joint processing is back to the decrement concentration basin to be processed again;
Solidifying agent comprises silicate cement, modified coal ash, fine sand, calcium sulfate described in the 5th step; The quality of described modified coal ash is 5 ~ 7% of silicate cement quality; The particle diameter of described fine sand is 0.63 ~ 1.25mm, and quality is 1 ~ 3% of silicate cement quality; The quality of described calcium sulfate is 0.6 ~ 1.4% of silicate cement quality; The preparation method of described modified coal ash is: flyash 280 ~ 320 ℃ of lower roastings 40 ~ 70 minutes, is taken out cooling, and sealing saves backup.
2. a kind of ecological dredging according to claim 1 and sludge solidification are disposed integral process, it is characterized in that: the first step is obtained underwater mud and is adopted ecological dredging jet pump.
3. a kind of ecological dredging according to claim 1 and sludge solidification are disposed integral process, it is characterized in that: described decrement concentration basin is along 2 ~ 10 storages of pond length direction series connection bucket, each storage bucket middle part arranges suction pipe, and the suction pipe bottom arranges whipping appts; Contain dirt water and enter flocculation sediment behind the decrement concentration basin, be deposited on and be disposed to next joint processing unit after concentrated mud in the storage bucket is drawn by suction pipe, the clear liquid that is positioned at body mud enrichment region top, pond is then discharged from the water outlet of decrement concentration basin afterbody.
4. a kind of ecological dredging according to claim 1 and sludge solidification are disposed integral process, and it is characterized in that: described flocculating agent A is polymerize aluminum chloride (PAC), and addition is 100 ~ 150ppm.
5. a kind of ecological dredging according to claim 1 and sludge solidification are disposed integral process, and it is characterized in that: described flocculating agent B is anionic polyacrylamide (APAM), and addition is 50 ~ 100ppm.
6. a kind of ecological dredging according to claim 1 and sludge solidification are disposed integral process, and it is characterized in that: described flocculation agent C is polymerize aluminum chloride (PAC), and addition is 25 ~ 45ppm.
7. a kind of ecological dredging according to claim 1 and sludge solidification are disposed integral process, and it is characterized in that: described flocculation agent D is cationic polyacrylamide (CPAM), and addition is 1 ~ 3ppm.
8. a kind of ecological dredging according to claim 1 and sludge solidification are disposed integral process, it is characterized in that: the usage quantity of solidifying agent is 3 ~ 7% of dehydrated sludge cake quality described in the 5th step.
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