CN102153263B - Efficient sludge concentration and dehydration system and dehydration method thereof - Google Patents
Efficient sludge concentration and dehydration system and dehydration method thereof Download PDFInfo
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- CN102153263B CN102153263B CN201110106716A CN201110106716A CN102153263B CN 102153263 B CN102153263 B CN 102153263B CN 201110106716 A CN201110106716 A CN 201110106716A CN 201110106716 A CN201110106716 A CN 201110106716A CN 102153263 B CN102153263 B CN 102153263B
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Abstract
The invention belongs to the technical field of sewage treatment, and particularly relates to a sludge concentration and dehydration system and a dehydration method thereof. The system is provided with a precipitation cone hopper on the lower side of a sludge concentration tank; a sludge delivery pipe for delivering sludge solution into the sludge concentration tank is arranged on the sludge concentration tank, a clean water discharge mechanism for discharging clean water to the exterior of the sludge concentration tank and a sludge discharge mechanism for discharging concentrated sludge to the exterior of the sludge concentration tank are also arranged on the sludge concentration tank; and the system also comprises a dissolved air floatation mechanism consisting of a dissolved air pump inlet pipe, a dissolved air pump, a buffer and a dissolved air water distributor. In the dehydration method, the sludge in the water continuously floats by the dissolved air technology of the dissolved air pump, so that the separated water becomes clean; and when air floatation is stopped and the clean water is discharged, the floating sludge naturally falls into the precipitation cone hopper and reaches the dehydration requirement. The dehydration effect of the dehydration system is good, the water content of the sludge can be furthest reduced, conditions are created for subsequent sludge dehydration and drying processes, and the operating costs of dehydration and drying are reduced.
Description
Technical field
The invention belongs to technical field of sewage, concrete a kind of sludge concentration and dewatering system and dewatering thereof.
Background technology
In field of environment engineering, biochemical technology Treating Municipal Sewage and trade effluent are adopted by numerous design departments or owner, and in the device vital role of having brought into play in service.The sludge treating system that matches with it simultaneously generally all disposes sludge thickener, disposes or spissated facility as the device excess sludge.But in the actual motion operating process; The container that the sludge thickener major part is all stored as mud discharging; Really do not play mud and concentrate desiccation, sludge discharged is rare mud (moisture >=99.5%) of high-moisture mostly in the therefore feasible existing sludge thickener.If the directly mummification (like press filtration) then increased the weight of sludge drying equipment operating load for no reason of rare mud of this high-moisture has reduced design and operation efficient, increased facility investment and running cost, also influenced the aqueous index of dewatered sludge to a great extent.
Sludge quantity without dehydration often is several times as much as the sludge quantity after the dehydration, and for example when moisture 99.5% mud is concentrated to moisture 90% mud, the mud weight after concentrated only is 1/20 of primary sludge weight.Therefore in engineering design; For guaranteeing the mummification effect of sludge treatment, during lectotype selection, mud handling capacity is all greater than actual mud generation; Also be that sludge drying equipment and supporting process facility thereof are all amplified the several times design, otherwise can not guarantee the normal operation of waste disposal plant.
Summary of the invention
One of the object of the invention provides a kind of sludge concentration and dewatering system, and the dehydrating effect of this dewatering system is good, can reduce the water cut of mud to greatest extent, for the sludge dehydrating and drying operation of postorder creates conditions, and has reduced the working cost of dehydration and drying.
Be to realize above-mentioned purpose, the present invention has adopted following technical scheme: a kind of sludge concentration and dewatering system, and native system comprises sludge thickener, the downside of sludge thickener is provided with deposition awl bucket; Described sludge thickener is provided with the sludge carrier pipe to sludge thickener delivered inside mud solution, also is provided with on the sludge thickener to the clear water discharging mechanism of sludge thickener outside drain clear water and to the mud discharging mechanism of sludge thickener outside drain mud; Native system also comprises the air dissolved pump inlet pipe that an end is connected with described deposition awl bucket; The other end of air dissolved pump inlet pipe links to each other with the inlet of air dissolved pump; The export pipeline of air dissolved pump leads to the inside of sludge thickener, and the export pipeline of air dissolved pump is positioned at the inner end of sludge thickener and is provided with the dissolved air water sparger; The water outlet of said dissolved air water sparger is higher than the top of deposition awl bucket; Also be provided with the inlet pipe parallelly connected on the said air dissolved pump inlet pipe with it; Be provided with the valve that opens and closes pipeline on the export pipeline of described air dissolved pump inlet pipe, air dissolved pump and the inlet pipe.
This sludge concentration and dewatering system can also be able to further realization in the following manner:
Described clear water discharging mechanism comprises the clear water delivery pipe that links to each other with sludge thickener, also comprises the valve that is arranged on the clear water delivery pipe.
Described mud discharging mechanism comprises the mud discharging pipe that links to each other with sludge thickener, also comprises the valve that is arranged on the mud discharging pipe.
The export pipeline of described air dissolved pump is provided with snubber, and snubber is arranged on being exported on the pipeline between the sludge thickener of air dissolved pump.
Described clear water delivery pipe is provided with a plurality of from top to bottom along the pond body of sludge thickener.
Described mud discharging pipe is provided with the mud discharging pump, and the pipeline that is in before the mud discharging pump intake of mud discharging pipe is front-seat pipeline, and the inlet end of front-seat pipeline stretches in the deposition awl bucket in the sludge thickener; The exit end of described sludge carrier pipe is connected with front-seat pipeline; Be in the exit end of sludge carrier pipe and the front-seat pipeline between the mud discharging pump intake and be provided with valve, sludge carrier pipe is provided with the valve that opens and closes pipeline.
Pipeline between described air dissolved pump and the snubber is provided with " ∩ " type bending pipeline, and the most significant end of " ∩ " type bending pipeline is higher than the high liquid level (HLL) in the sludge thickener.
Another object of the present invention provides a kind of dewatering, and it comprises the steps:
1), open sludge carrier pipe, lentamente mud is discharged to sludge thickener, start air dissolved pump simultaneously, and open and regulate the intake valve that is arranged on the inlet pipe to suck air, the internal circulating load of adjustment air dissolved pump keeps continuing to dissolve vaporous condition; Observe bubble and air supporting situation in the sludge thickener, and look muddy water layering situation adjustment mud inlet;
2), the water sludge interface in sludge thickener is clearly demarcated, the liquid level in the sludge thickener is opened the outside draining of clear water discharging mechanism near in limited time high, and makes the liquid level in the sludge thickener keep stable;
3), along with air supporting operation continue carry out, the come-up sludge blanket is thickeied gradually, water sludge interface will descend, continue to make the clear water discharging mechanism outwards to discharge clear water this moment; When the clear water in the sludge thickener discharges when finishing basically, promptly close clear water discharging mechanism, sludge carrier pipe and air dissolved pump, and open mud discharging mechanism, air supporting is concentrated the high concentration sludge that obtains outwards carry.
At operating procedure 1) before, at first in sludge thickener, feed clear water, start the air dissolved pump trial run; Gas effect, bubble size and distribution situation are dissolved in inspection, and the situation of inspection sludge thickener, valve and pipeline leakage, after confirming to reach design requirements; The top clear water is discharged; Keep the clear water that has 1/2 liquid level in the sludge thickener, close the clear water discharging mechanism, operating procedure 1 then).
Described step 1), 2), 3) operate continuously forms a mud and concentrates the cycle, operation or the intermitten service continuously of concentrated cycle of each mud.
The present invention compares with prior art has following beneficial effect:
1), embodiment of the present invention has two kinds: the one, original design, for the WWT biochemical system supporting; The 2nd, the old WWT biochemical system that has put into operation is transformed; Two kinds of embodiments are identical substantially;
2), the sludge thickener among the present invention can adopt Steel Concrete to water, when the volume of sludge thickener hour also can adopt steel or non-metallic material to make;
3), the present invention adopts air dissolved pump to dissolve gas, air dissolved pump is installed near sludge thickener, is convenient to take over and reduce resistance;
4), the dissolved air water in air dissolved pump exit is through buffer buffers, to reach the required residence time, guarantees air flotation effect preferably.
5), the clear water delivery pipe establishes several on the different heights of sludge thickener pond body, help discharging at various height clear water.
6), dissolved air water is distributed in the top of deposition awl bucket through sparger, and is laid in the upside of deposition awl bucket equably, so that dissolved air water and mud thorough mixing;
7), to dissolve gas be that gas is dissolved in circulation to the air dissolved pump among the present invention, can be constantly with mud emersion in the water, make the water after the separation become clear; After stop air supporting, getting rid of clear water, come-up mud falls into deposition awl bucket naturally and reaches the dehydration requirement, with the mud discharging pump mud is transported to down road mummification operation again;
8), the present invention in the air-dissolving air-float process, mud can effectively reduce BOD in the sewage under the effect of dissolved oxygen
5, reach the effect that purifies water.
Description of drawings
Fig. 1 is a process flow sheet of the present invention;
Fig. 2 is a structural representation of the present invention.
Embodiment
Like Fig. 1, shown in 2; Rare mud (moisture more than the 99.5%) gravity flow or the pump of biochemistry pool or second pond 14 dischargings are promoted to sludge thickener 6; In sludge thickener 6, leave standstill through the short period of time; Most of mud sinks to the deposition awl bucket 3 at the bottom of the pond, if the water sludge interface in the sludge thickener 6 is clearly demarcated, then earlier the bottom clear water is drained into equalizing tank 15 or carries go back to system.When being expelled to, clear water stops discharging when comparatively muddy.Start mud discharging pump 11, insoluble gas effluxes and will lodge in the mud that precipitates in the awl bucket 3 earlier; When effluxing sludge concentration when very rare, promptly stop to efflux.Start air dissolved pump 9 then, open molten air valve, the molten tolerance of control air dissolved pump 9 water outlets makes the rare mud circulation in the sludge thickener 6 dissolve gas.Rare mud in the sludge thickener 6 is under the effect of dissolved air water, and mud granule density reduces, and is come-up trend.Through the operation of for some time, the granule sludge in the sludge thickener 6 floats gradually, and forms water sludge interface comparatively clearly.Can stop the operation of air dissolved pump 9 this moment, and the clear water in the sludge thickener 6 is drained into equalizing tank 15.Along with the discharge of clear water, mud scum descends, and when the clear water feculence of discharging, stops discharging.At this moment mud scum falls within the deposition awl bucket 3, restarts mud discharging pump 11 and mud is sent into the sludge dehydrating and drying device carries out subsequent disposal.
Air flotation technology is used for mud and concentrates and to anhydrate, and its principle is under pressurized conditions, and air is dissolved in the water; Produce the supersaturated solution of air, the air in the water is discharged, form a large amount of micro bubbles; Micro bubble under the effect of the multiple power such as static pressure of buoyancy and water attached to solid particles surface, thereby reduced the density of solid particulate, and make the density of solid particulate less than water; Float on the solid particulate thus on the water surface, to realize separating of water and solids.
The air supporting process by bubble produce, the release of bubble is adhered to solid (or liquid) particle with bubble and float and step such as separate and form.When air flotation technology is used for mud and concentrates, must possess two conditions: the one, Xiang Shuizhong provides abundant micro-bubble; The 2nd, make mud granule be suspended state and have certain hydrophobicity.The present invention adopts air dissolved pump to dissolve the gas technology, has characteristics such as dissolving large-minded, the little and strong adhesion of bubble particles.
Below in conjunction with Fig. 2 operational process of the present invention is described further:
1, this device build up or technological transformation after, in sludge thickener 6, feed clear water, start air dissolved pump 9 trial runs.The gas effect is dissolved in inspection; Bubble size and bubble distribution situation are checked situation such as total system sludge sump, valve, pipeline leakage simultaneously, after confirming to reach design requirements; Clear water is discharged; Keep the water body of 1/2 liquid level in the sludge thickener 6, close the valve on the clear water delivery pipe 4, promptly possess the mud condition of anhydrating.
2, open by the mud discharging valve on the logical sludge carrier pipe 1 that comes in biochemistry pool place; Slowly mud is discharged to sludge thickener 6, start air dissolved pump 9 simultaneously, air dissolved pump 9 sucks mud through air dissolved pump inlet pipe 2 autoprecipitations awl bucket 3; Open and regulate the intake valve 12 on the inlet pipe; Suck air, and the internal circulating load of adjustment air dissolved pump 9, keep continuing to dissolve vaporous condition.
3, bubble and the air supporting situation in the observation sludge thickener 6, and look muddy water layering situation adjustment mud inlet.
4, clearly demarcated when water sludge interface, the liquid level in the sludge thickener 6 is prescribed a time limit near high, the valve on the runin clear water delivery pipe 4, and outwards draining, and make every effort to keep sludge thickener 6 liquid level stabilizings.
5, along with air supporting operation continue carry out, the air supporting layer 8 that come-up mud 7 forms is thickeied gradually, water sludge interface will descend.Close the valve on the clear water delivery pipe 4 of sludge thickener 6 pond body upsides, open the valve on the clear water delivery pipe 4 of pond body downside.When draining obviously becomes muddy, promptly stop draining and mud and get into, close air dissolved pump 9, change out mud discharging pump 11, mud scum and bottom mud are outwards carried.
6, after the heavy mud of the part of mud scum in the pond and bottom racks up, promptly accomplish primary sludge and concentrate the cycle, carry out next cycle in the same way.
Claims (10)
1. sludge concentration and dewatering system, it is characterized in that: native system comprises sludge thickener (6), the downside of sludge thickener (6) is provided with deposition awl bucket (3); Described sludge thickener (6) is provided with the sludge carrier pipe (1) to sludge thickener (6) delivered inside mud, also is provided with on the sludge thickener (6) to the clear water discharging mechanism of sludge thickener (6) outside drain clear water and to the mud discharging mechanism of sludge thickener (6) outside drain mud; Native system also comprises the air dissolved pump inlet pipe (2) that an end is connected with described deposition awl bucket (3); The other end of air dissolved pump inlet pipe (2) links to each other with the inlet of air dissolved pump (9); The export pipeline of air dissolved pump (9) leads to the inside of sludge thickener (6), and the export pipeline of air dissolved pump (9) is positioned at the inner end of sludge thickener (6) and is provided with dissolved air water sparger (5); The water outlet of said dissolved air water sparger (5) is higher than the top of deposition awl bucket (3); Also be provided with the inlet pipe parallelly connected on the said air dissolved pump inlet pipe (2) with it; Be provided with the valve that opens and closes pipeline on the export pipeline of described air dissolved pump inlet pipe (2), air dissolved pump (9) and the inlet pipe.
2. sludge concentration and dewatering according to claim 1 system, it is characterized in that: described clear water discharging mechanism comprises the clear water delivery pipe (4) that links to each other with sludge thickener (6), also comprises the valve that is arranged on the clear water delivery pipe (4).
3. sludge concentration and dewatering according to claim 1 system is characterized in that: described mud discharging mechanism comprises the mud discharging pipe (13) that links to each other with sludge thickener (6), also comprises the valve that is arranged on the mud discharging pipe (13).
4. sludge concentration and dewatering according to claim 1 system, it is characterized in that: the export pipeline of described air dissolved pump (9) is provided with snubber (10), and snubber (10) is arranged on being exported on the pipeline between the sludge thickener (6) of air dissolved pump (9).
5. sludge concentration and dewatering according to claim 2 system, it is characterized in that: described clear water delivery pipe (4) is provided with a plurality of from top to bottom along the pond body of sludge thickener (6).
6. sludge concentration and dewatering according to claim 3 system; It is characterized in that: described mud discharging pipe (13) is provided with mud discharging pump (11); The pipeline that mud discharging pipe (13) is in before mud discharging pump (11) inlet is front-seat pipeline, and the inlet end of front-seat pipeline stretches in the deposition awl bucket (3) in the sludge thickener (6); The exit end of described sludge carrier pipe (1) is connected with front-seat pipeline; Be in the exit end of sludge carrier pipe (1) and the front-seat pipeline between mud discharging pump (11) inlet and be provided with valve, sludge carrier pipe (1) is provided with the valve that opens and closes pipeline.
7. sludge concentration and dewatering according to claim 4 system, it is characterized in that: the pipeline between described air dissolved pump (9) and the snubber (10) is provided with " ∩ " type pipeline, and the most significant end of " ∩ " type pipeline is higher than the high liquid level (HLL) in the sludge thickener (6).
8. dewatering according to each described sludge concentration and dewatering system of claim 1～7, it comprises the steps:
1), open sludge carrier pipe (1), lentamente mud is carried to sludge thickener (6), start air dissolved pump (9) simultaneously, and open and regulate the intake valve that is arranged on the inlet pipe to suck air, the internal circulating load of adjustment air dissolved pump (9) keeps continuing to dissolve vaporous condition; Observe bubble and air supporting situation in the sludge thickener (6), and look muddy water layering situation adjustment mud inlet;
2), the water sludge interface in sludge thickener (6) is clearly demarcated, the liquid level in the sludge thickener (6) is opened the outside draining of clear water discharging mechanism near in limited time high, and makes the liquid level in the sludge thickener (6) keep stable;
3), along with air supporting operation continue carry out, the come-up sludge blanket is thickeied gradually, water sludge interface will descend, continue to make the clear water discharging mechanism outwards to discharge clear water this moment; When the clear water in the sludge thickener (6) discharges when finishing basically, promptly close clear water discharging mechanism, sludge carrier pipe (1) and air dissolved pump (9), and open mud discharging mechanism, air supporting is concentrated the high concentration sludge that obtains outwards carry.
9. dewatering according to claim 8 is characterized in that: at operating procedure 1) before, at first in sludge thickener (6), feed clear water, start air dissolved pump (9) trial run; Gas effect, bubble size and distribution situation are dissolved in inspection; And the situation of inspection sludge thickener (6), valve and pipeline leakage; After confirming to reach design requirements, the top clear water is discharged, keep the clear water that has 1/2 liquid level in the sludge thickener (6); Close the clear water discharging mechanism, operating procedure 1 then).
10. according to Claim 8 or 9 described dewaterings, it is characterized in that: described step 1), 2), 3) operate continuously forms a mud and concentrates the cycle, each mud concentrates cycle operation or intermitten service continuously.
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| CN201110106716A CN102153263B (en) | 2011-04-27 | 2011-04-27 | Efficient sludge concentration and dehydration system and dehydration method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105289079B (en) * | 2015-11-20 | 2018-01-16 | 四川北方硝化棉股份有限公司 | A kind of sludge band filter sieves filter with roller |
| CN106630532B (en) * | 2016-11-17 | 2020-03-24 | 天津市市政工程设计研究院 | Tank-maintenance-free sludge treatment method with sludge concentration function |
| CN109320033A (en) * | 2018-11-23 | 2019-02-12 | 泰州明锋资源再生科技有限公司 | Lifting/lowering type air floating structure applied to pickling Treatment of Sludge |
| CN111547944A (en) * | 2020-05-14 | 2020-08-18 | 广东电网有限责任公司东莞供电局 | Sewage multiple treatment device |
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| CN202063814U (en) * | 2011-04-27 | 2011-12-07 | 安徽南风环境工程技术有限公司 | Efficient sludge concentrating and dehydrating system |
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| US4082671A (en) * | 1976-09-30 | 1978-04-04 | Envirotech Corporation | Sludge thickening apparatus |
| FR2633608B1 (en) * | 1988-06-30 | 1991-09-20 | Degremont | IMPROVED APPARATUS FOR THE THICKENING, BY FLOATING, OF SLUDGES PRODUCED DURING THE TREATMENT OF WATER |
| CN1502561A (en) * | 2002-11-19 | 2004-06-09 | 上海西科水科学环保技术有限公司 | Air flotation pool adopting central driven residue-scraping machine |
| CN201033264Y (en) * | 2007-03-29 | 2008-03-12 | 复旦大学 | High-efficiency water clarifying processing equipment |
| CA2629593A1 (en) * | 2008-04-11 | 2009-10-11 | James Michael Dunbar | Feedback control scheme for optimizing dewatering processes |
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| CN202063814U (en) * | 2011-04-27 | 2011-12-07 | 安徽南风环境工程技术有限公司 | Efficient sludge concentrating and dehydrating system |
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