CN105776799A - Factorization electroosmosis sludge dehydration treatment process - Google Patents
Factorization electroosmosis sludge dehydration treatment process Download PDFInfo
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- CN105776799A CN105776799A CN201610137678.3A CN201610137678A CN105776799A CN 105776799 A CN105776799 A CN 105776799A CN 201610137678 A CN201610137678 A CN 201610137678A CN 105776799 A CN105776799 A CN 105776799A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/006—Electrochemical treatment, e.g. electro-oxidation or electro-osmosis
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/06—Sludge reduction, e.g. by lysis
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Abstract
The invention discloses a factorization electroosmosis sludge dehydration treatment process which comprises the following steps: (1) allocating treating ponds, appointing at least one of the treating ponds as an electroosmosis treating pond and the other as deposition treating ponds, and arranging electrodes in the electroosmosis treating pond; (2) performing sludge pre-deposition treatment; (3) performing sludge pre-seepage water treatment; (4) performing sludge electroosmosis pre-treatment; (5) performing sludge electroosmosis dehydration treatment; (6) discharging. The factorization electroosmosis sludge dehydration treatment process needs no complex treatment process, does not need to take the costs of maintenance, overhaul and the like of devices into account, and is small in use difficulty, simple in operation process and low in overall operation cost.
Description
Technical field
The present invention relates to a kind of processing method of sludge dewatering, relate more particularly to a kind of batch production electro-osmosis sludge dehydration treatment technology.
Background technology
According to " " 12 " whole nation urban wastewater treatment and the planning of regeneration Facilities Construction " data, current wastewater treatment in China ability is 1.2476 × 108T/d, will rise to 1.7045 × 10 by 20158T/d, the simultaneously average operating load rate about 84% of whole nation sewage disposal device.At the end of projected cutoff 2015, China's dewatered sludge annual production will more than 2.6 × 107t.The 25%～65% of the investment of whole Sewage Plant and operating cost, for the process of mud and disposal, becomes the heavy burden of sewage treatment plant.Meanwhile, cause huge pressure also to increasingly serious ecological environment.How to dispose sewage plant sludge, find practicable most effective solution route, it is achieved the comprehensive utilization of resource, it has also become the problem of social concerns.
Existing process for treating sludge is nearly following several: topple over landfill, biology controls gas, building utilization, burning method.
Existing processing method the most ripe, environmental protection is: sludge incineration method.But moisture content is had higher requirement by sludge incineration, when moisture percentage in sewage sludge is down to less than 40%, mud just can carry out burning electricity generation directly as fuel.Existing sludge dehydrating and drying generally has following several:
One, direct mechanical evaporation: the moisture percentage in sewage sludge that conventional belt and two kinds of methods of centrifuge dehydration process is also simply about 85%.
Two, machinery medicament synthetic method: be usually diaphragm filter press adding medicine and carry out the processed of mud.Generally can dehydration to about 65%.But this method needs a large amount of medicaments, causes the fuel value of dry mud to reduce, can increase the secondary pollution of environment simultaneously.
Three, heat treating process: dry for your mud with the waste heat of power plant, energy consumption is high, apparatus and process is complicated, produces substantial amounts of gaseous contamination.
Four, electroosmotic dewatering technology
Electroosmotic dewatering is the principle utilizing electric field force, and mud cellular water carries out a kind of method that is broken and that discharge.This method is insensitive to soil particle size requirements, and efficiency is high.Not only can discharge Free water, it is also possible to discharge weak binding water, moisture percentage in sewage sludge can be substantially reduced.It it is a kind of novel processing scheme.
Existing electro-osmosis sludge dewatering technology is generally adopted mechanical expression and powers up the principle of field force, anode and negative electrode as conductive electrode, produces electric field force, and electrode also serves as mechanical metal squeezing face simultaneously.Mud, from middle process, when mechanical force and electric field force, carries out dehydration.
From scale: existing electroosmotic dewatering is generally adopted midget plant, and to be processed process be main, and treating capacity is little.Due to all technical situation such as electrode materials, major part still rests on laboratory stage.
Summary of the invention
Present invention aims to the problems referred to above of prior art, it is provided that a kind of can batch production, the rapid, high volume technique that carries out sludge dewatering treatment.
The technical solution adopted in the present invention is: provides a kind of batch production electro-osmosis sludge dehydration treatment technology, comprises the steps:
(1) allocation process pond, it is intended that it is that electro-osmosis processes pond that at least one of which processes pond, all the other process pond for preformed precipitate, and carry out electrode layout in electro-osmosis process pond；
(2) mud preformed precipitate processes；
(3) the pre-water seepage treatment of mud；
(4) the saturating pretreatment of sludge electroosmotic；
(5) the saturating processed of sludge electroosmotic；
(6) discharging.
Preferably, the arrangement of electrode is: in processing pond, arranges 1 corrosion-resistant electrode every 1 meter, and arranges the wire connecting electrode, and the electrode between adjacent two rows is contrary；Described anti-corrosion electric extremely hollow cylinder, cylinder is provided with multiple leaking hole, and corrosion-resistant electrode outer surface is wrapped with conduction infiltration cloth, and the water gone out during electro-osmosis processes is entered into inside corrosion-resistant electrode by leaking hole.
Preferably, preformed precipitate processes before referring to entrance processed, and mud staticly settles in preformed precipitate processes, until moisture content reduces 3-10%.
Preferably, pre-water seepage treatment refers to and allows mud stand in electroosmotic dewatering pond, until mud liquid level decline < 3 millimeters in 2 hours.
Preferably, the voltage selected by electro-osmosis pretreatment is: DC50V～DC200V.
Preferably, electroosmotic dewatering processes selected voltage is DC20V～DC50V.
Preferably, after the electro-osmosis pretreatment of step (4) carries out first time, again process pond from preformed precipitate pond toward electro-osmosis and fill it up with mud, carry out pre-water seepage treatment and electro-osmosis pretreatment, repeat 3～4 times.
Preferably, in first week of the saturating processed of step (5) sludge electroosmotic, adjusting both positive and negative polarity polarity every certain process time according to actual water yield, the saturating processed second week of sludge electroosmotic, positive and negative electrode is commutation no longer.
Preferably, the voltage of each electro-osmosis pretreatment increases along with number of times and increases.
Preferably, the situation according to the saturating pretreatment of sludge electroosmotic, after electro-osmosis pretreatment, electroosmotic dewatering arranges sludge agitation step before processing.
The present invention is compared with prior art: without complicated process technique, without maintenance and the cost of overhaul etc. that consider device, using difficulty little, operation process is simple, and overall operation cost is low.
Detailed description of the invention
General electro-osmosis Treatment of Sludge, treating capacity is little, it is difficult to volume production, and this piles up problem for the mud day by day increased, and still can not meet process requirement.The batch production electro-osmosis sludge dehydration treatment technology of the present invention, drafts based on the electro-osmosis principle of sludge dewatering, and problem complicated for prior art processes, that equipment is complicated, is made that improvement.
Wherein it should be noted that, mud referred to herein includes the mud being commonly understood by meaning, such as factory sludge, domestic sludge and construction slurry, riverway sludge, cloaca mud and sludge of sewage treatment plant, riverway sludge, sea mud, Soft Soil Layer etc. containing solid or a semi-solid sedimentary class material.
Batch production electro-osmosis sludge treatment technique according to the present invention, comprises the steps:
(1) allocation process pond, it is intended that it is that electro-osmosis processes pond that at least one of which processes pond, all the other process pond for preformed precipitate, and carry out electrode layout in electro-osmosis process pond；
(2) mud preformed precipitate processes；
(3) the pre-water seepage treatment of mud；
(4) the saturating pretreatment of sludge electroosmotic；
(5) the saturating processed of sludge electroosmotic；
(6) discharging.
Wherein, in step (1), described electrode is arranged and is adopted corrosion-resistant electrode.Corrosion-resistant electrode, relative to general metal electrode, solves the etching problem of electrode in Treatment of Sludge well.Process in pond in electro-osmosis, arrange 1 corrosion-resistant electrode every 1 meter, and arrange wire.Electrode between adjacent two rows is contrary.Wherein, anti-corrosion electric is hollow cylinder extremely, and cross section can be circular, oval, square etc., and cylinder is provided with multiple leaking hole, and corrosion-resistant electrode outer surface is wrapped with conduction infiltration cloth thus the effect of intensifier electrode can derive during institute's electro-osmosis processes the water sloughed.The water gone out during electro-osmosis processes can be entered into inside corrosion-resistant electrode by leaking hole.
In general, corrosion-resistant electrode can adopt material manufacture that is corrosion-resistant and that can conduct electricity, such as Plastic conductive material, non-metallic conducting material etc..
Wherein in step (2), mud is placed in preformed precipitate pond, first carries out preformed precipitate process.This process allows mud staticly settle, owing in mud, mud granule is different with the density proportion of hydrone, the Free water meeting precipitated and separated on mud granule and mud top layer time static, the upper strata Free water that the overwhelming majority is precipitated out can float on mud top layer, can be discharged by drainage grill.Preferably, it is also possible to suction pump is set, the upper strata Free water formed after standing in preformed precipitate pond is directly taken away.When preformed precipitate processes more than when 72 is little, and the mud top layer in preformed precipitate pond has more than 2/3 no longer awash, then can carry out the pre-water seepage treatment of step (3) mud.The main purpose that preformed precipitate processes is to remove the Free water in a part of mud, different types of mud, the degree varies sample that moisture content reduces in preformed precipitate processes, on the whole, through the mud that preformed precipitate processes, moisture content reduces 3%-10%, thus process saving time and energy consumption for next step electro-osmosis.
After step (2), mud is pumped to electroosmotic dewatering from preliminary sedimentation tank and processes pond.
Wherein in step (3), the mud entering electroosmotic dewatering process pond first carries out pre-water seepage treatment.Namely pre-water seepage treatment allows mud stand, and has just added electric osmose processed pond due to mud from preformed precipitate pond, now can have many physical clearance between mud, and mud and electrode contact insufficient.Now as carried out electric osmose process at once, wasting energy consumption, drainage effect is bad.Being stood by mud, the effect of gravity can allow the mutual compacting of mud, and also can discharge the Free water near partial electrode.Reducing physical voids between mud owing to mud stands compacting, thus conductivity strengthens, and electrode and mud obtain and is fully contacted, and the work efficiency of electro-osmosis is greatly improved, and gets ready for process afterwards.In general, the pre-water seepage treatment of mud after about 24 hours mud liquid level be no longer decreased obviously, now can start electro-osmosis pretreatment.In general mud liquid level decline < 3 millimeters in 2 hours, namely it is believed that liquid level is no longer decreased obviously.Preferably, in situation more accurately, in 2 hours, the decline of mud liquid level should less than 1 millimeter.
After pre-water seepage treatment, just carry out the electro-osmosis pretreatment of step (4).Electro-osmosis pretreatment needs to apply voltage and carries out, applied magnitude of voltage floats by concrete sludge characteristics and determines, in general, adopt big voltage, big current system: selected potential force gradient is at 0.5V-2V/cm, namely the mud required voltage of every cm thick is at about 0.5V-2V.Preferably, electro-osmosis process power-on voltage is: DC50V-DC200V.Now electric current can be relatively larger, and often group electrode current is about 0.8A-3A/ unit rice, and drainage effect is clearly.Electro-osmosis pretreatment is commonly performed 2-3 days, and owing to the time is shorter, mud is essentially without cracking and hardening occur, the situations such as cracking and the hardening that need not consider electrode tip earth, when, after 2-3 days, mud liquid level can be decreased obviously, namely about decline 1/3, now stop primary electro-osmosis pretreatment.Both positive and negative polarity polarity is adjusted every certain process time according to actual water yield during whole electro-osmosis pretreatment.Preferably, every 3～5 hours, the polarity of spaced electrode was adjusted, namely original positive pole is converted to negative pole, and negative pole originally is converted to positive pole.The both positive and negative polarity conversion time during the saturating pretreatment of sludge electroosmotic is shorter than the both positive and negative polarity conversion time during the saturating process of sludge electroosmotic, because have employed big voltage high-current mode during electro-osmosis pretreatment to process, process intensity bigger, it is therefore desirable within a short period of time carries out electrode change.
After first time electro-osmosis pretreatment, again process pond from preformed precipitate pond toward electro-osmosis and fill it up with mud.Then through about 1 day pre-water seepage treatment of mud, electro-osmosis pretreatment in 2-3 days, then fill it up with mud from preformed precipitate pond toward electro-osmosis process pond, so circulation 3-4 time.By electro-osmosis pretreatment repeatedly, add mud handling capacity, and also lower floor's mud can be carried out successively compacting, reduce mud cracking.This process is it is generally required to 12-16 days.Process subsequently into electroosmotic dewatering.Further, every time add mud after electro-osmosis preconditioned voltage all increase to some extent than the last time, it is preferable that often add one layer of mud and carry out electro-osmosis pretreatment, the voltage height 25-30% that the voltage ratio adopted adopts previous stage.It is experimentally verified that, often add primary sludge, voltage must be improved accordingly, could to being newly added mud and original mud fully processes, otherwise, the mud being currently joined into can consume the power consumption of substantial amounts of voltage, and lower floor's mud can not be performed continuously over electrolytic treatments in this stage, then overall electro-osmosis pretreating effect receives serious impact.On the other hand, being experimentally verified that, voltage is not suitable for increasing doublely, and the excessive one side of voltage wastes resource, and excessively strengthening of voltage the speed not being greatly improved electro-osmosis pre-treatment step on the other hand.
Preferably, after electro-osmosis pretreatment, electroosmotic dewatering can arrange sludge agitation step, depending on mud kind before processing.Owing to, during electro-osmosis pretreatment, certain form of mud is owing to, after gravity and electro-osmosis pretreatment, moisture reduces, and therefore lower floor's mud is subject to these impacts, and upper layer mud is more densely cross-linked, and therefore the density of each layer of mud is uneven.So, during electroosmotic dewatering processes, it is impossible to control corrosion-resistant electrode formation and different voltage is set by the degree of depth, density difference mud is processed, whole electroosmotic dewatering is existed harmful effect.It is thus desirable to mud is carried out certain stirring so that the upper and lower water content of mud after carrying out electro-osmosis pretreatment in whole electro-osmosis pond, before electroosmotic dewatering process is consistent, it is simple to what next electroosmotic dewatering processed is smoothed out.
During electroosmotic dewatering processes, applied magnitude of voltage floats by concrete sludge characteristics and determines, in general, the situation such as cracking and hardening in order to avoid electrode tip earth, big voltage high-current mode should not be adopted, but adopting small voltage, small area analysis mode: selected potential force gradient is at 0.2-0.5V/cm, namely the mud required voltage of every cm thick is at about 0.2V-0.5V.Preferably, electro-osmosis process power-on voltage is: DC20V-DC50V.The electric current that the current ratio electro-osmosis pretreatment that this stage adopts adopts is little, and often group electrode current is about 0.3A-0.8A/ unit rice, thus draining is relatively slower, but more stable, and whole structure is good.
Electroosmotic dewatering processes in starting one week and adjusts both positive and negative polarity polarity every certain process time according to actual water yield.Preferably, every 6 hours, the polarity of positive and negative electrode is adjusted, namely original positive pole is converted to negative pole, and negative pole originally is converted to positive pole.Having arrived electroosmotic dewatering and processed second week, positive and negative electrode is commutation no longer, and normal power-up processes.When electro-osmosis processes, it is necessary to electric current and displacement are detected automatically.When detecting that the electric current often organizing electrode is low to moderate initial less than 1/15 (below minimum 0.02A/ unit rice), note observing displacement.When the same day, displacement calculated the one thousandth less than Treatment of Sludge gross weight by weight, it is believed that the saturating dehydration of sludge electroosmotic is complete, now the moisture content of mud is typically between 40%-60%.The saturating dehydration of sludge electroosmotic of step (5) is it is generally required to about 25 days.Then step (6) namely the discharging work of dehydrated sludge can be entered.Discharging time general control is within 5 days.
Thoroughly process in pond furthermore it is preferred that be additionally may included in sludge electroosmotic in step (1) drainage system is set.General electro-osmosis processes needs to coordinate vacuum pump to draw water draining, such drainage pattern needs up to draw water to be then exhausted from, substantial amounts of energy consumption need to be consumed and overcome gravity acting, the layout making the operation of whole technique and related facility is increasingly complex, and the present invention is to solve this problem, process to arrange in advance bottom pond in electro-osmosis and set drainage pipeline networks, on drainage pipeline networks, interval arranges osculum, the sewage taken off enters drainage pipeline networks via osculum, collect to common sewer then through drainage pipeline networks, and it flow to sewage deep well through effusion meter, treat subsequent treatment.And the method according to the invention, drainage pipeline networks is arranged on electro-osmosis to be processed below pond, utilizes the principle natural drainage of water gravity, it is not necessary to arrange extra drainage equipment.Compared with the prior art, namely the draining of the present invention does not need too much energy consumption, unnecessary equipment, simultaneously because containing substantial amounts of moisture in mud, greatly strengthen drainage efficiency by conducting oneself with dignity.
Above-mentioned embodiment according to the present invention, corrosion-resistant electrode is vertically inserted in mud, and adjacent row or the electrode between adjacent column are reversed；And the further embodiment according to the present invention, corrosion-resistant electrode can also process the opened electrode insert port in side, pond from electroosmotic dewatering and be horizontally inserted mud, and in horizontal direction, the electrode of adjacent layer is reversed；According to the present invention another preferred embodiment in, in order to accelerate the efficiency of whole sludge dewatering, it would however also be possible to employ comprehensive arrangement, after being namely first inserted vertically into mud, the further horizontally disposed corrosion-resistant electrode of relative set.Additionally, the another preferred implementation according to the present invention, corrosion-resistant electrode also horizontal cross can be arranged in the both sides up and down of mud, upper electrode positive pole, lower electrode negative pole.When being horizontally disposed with or comprehensively arrange, pipe coupling then needs corresponding flexible pipe use of arranging in pairs or groups, and is discharged via Drain pipe network smoothly by the water that horizontally disposed corrosion-resistant electrode effect is formed.When actual treatment, certain pressure mode can be assisted, and different voltage system controls.Such treatment effect is better.The corrosion-resistant electrode of the present invention can be metal electrode or the conductive nonmetal material with Corrosion Protection.
The above; it is only patent of the present invention preferably detailed description of the invention; but the protection domain of patent of the present invention is not limited thereto; any those familiar with the art is in the technical scope of patent diselosesll of the present invention; the change that can readily occur in or replacement, all should be encompassed within the protection domain of patent of the present invention.
Claims (10)
1. a batch production electro-osmosis sludge dehydration treatment technology, comprises the steps:
(1) allocation process pond, it is intended that it is that electro-osmosis processes pond that at least one of which processes pond, all the other process pond for preformed precipitate, and carry out electrode layout in electro-osmosis process pond；
(2) mud preformed precipitate processes；
(3) the pre-water seepage treatment of mud；
(4) the saturating pretreatment of sludge electroosmotic；
(5) the saturating processed of sludge electroosmotic；
(6) discharging.
2. processed technique as claimed in claim 1, wherein the arrangement of electrode is: in processing pond, arranges 1 corrosion-resistant electrode every about 1 meter, and arranges the wire connecting electrode, and the electrode between adjacent two rows is contrary；Described anti-corrosion electric extremely hollow cylinder, cylinder is provided with multiple leaking hole, and corrosion-resistant electrode outer surface is wrapped with conduction infiltration cloth, and the water gone out during electro-osmosis processes is entered into inside corrosion-resistant electrode by leaking hole.
3. processed technique as claimed in claim 2, before wherein preformed precipitate processes and refers to entrance processed, mud staticly settles in preformed precipitate processes, until moisture content reduces 3-10%.
4. processed technique as claimed in claim 3, wherein pre-water seepage treatment refers to and allows mud stand in electroosmotic dewatering pond, until mud liquid level decline < 3 millimeters in 2 hours.
5. processed technique as claimed in claim 4, wherein the voltage selected by electro-osmosis pretreatment is: DC50V～DC200V.
6. processed technique as claimed in claim 5, wherein electroosmotic dewatering processes selected voltage is DC20V～DC50V.
7. such as the processed technique of claim 4 or 5, after wherein the electro-osmosis pretreatment of step (4) carries out first time, again process pond from preformed precipitate pond toward electro-osmosis and fill it up with mud, carry out pre-water seepage treatment and electro-osmosis pretreatment, repeat 3～4 times.
8. such as the processed technique of claim 4 or 5, wherein in first week of the saturating processed of step (5) sludge electroosmotic, adjusting both positive and negative polarity polarity every certain process time according to actual water yield, the saturating processed second week of sludge electroosmotic, positive and negative electrode is commutation no longer.
9. processed technique as claimed in claim 7, wherein the voltage of electro-osmosis pretreatment every time increases along with number of times and increases.
10. processed technique as claimed in claim 9, the wherein situation according to the saturating pretreatment of sludge electroosmotic, after electro-osmosis pretreatment, electroosmotic dewatering arranges sludge agitation step before processing.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106630516A (en) * | 2017-03-14 | 2017-05-10 | 顾聪颖 | Electroosmosis drainage and dehumidification device for livestock zymocyte bed |
| CN106966565A (en) * | 2017-05-19 | 2017-07-21 | 北京东方同华科技股份有限公司 | Electric osmose body refuse conditioner |
| CN107012854A (en) * | 2017-05-22 | 2017-08-04 | 江苏绿畅路面新材料有限公司 | A kind of batch production heavy metal mud water discharge method |
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| CN102653438A (en) * | 2012-05-22 | 2012-09-05 | 江苏百新环境工程有限公司 | Electroosmosis belt type squeezing sludge dehydration equipment |
| CN105016601A (en) * | 2015-07-03 | 2015-11-04 | 天津霍普环保科技有限公司 | Electro-osmotic dewatering technology for biological sludge |
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2016
- 2016-03-10 CN CN201610137678.3A patent/CN105776799B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102653438A (en) * | 2012-05-22 | 2012-09-05 | 江苏百新环境工程有限公司 | Electroosmosis belt type squeezing sludge dehydration equipment |
| CN105016601A (en) * | 2015-07-03 | 2015-11-04 | 天津霍普环保科技有限公司 | Electro-osmotic dewatering technology for biological sludge |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106630516A (en) * | 2017-03-14 | 2017-05-10 | 顾聪颖 | Electroosmosis drainage and dehumidification device for livestock zymocyte bed |
| CN106966565A (en) * | 2017-05-19 | 2017-07-21 | 北京东方同华科技股份有限公司 | Electric osmose body refuse conditioner |
| CN107012854A (en) * | 2017-05-22 | 2017-08-04 | 江苏绿畅路面新材料有限公司 | A kind of batch production heavy metal mud water discharge method |
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