A kind of sludge semi-dry processes technique
The present invention relates to a kind of sludge semi-dry and process technique, belong to technical field of sludge treatment.
Add up according to People's Republic of China's Environmental Protection Department, the national sewage treatment facility 4436 put into operation in 2014, always
Design Treatment amount 1.71 billion cubic meters/day, the average treatment water yield 1.35 billion cubic meter, mud generation amount is more than 40,000,000 tons/year.
Mud is because moisture content is high, content of organics is high, containing the harmful substance such as heavy metal and pathogenic microorganism, and has strong foul smell
Road, has a strong impact on ecological environment if do not carried out dealing carefully with and jeopardizes the health of the mankind.But heavy water light mud phenomenon all the time
Causing sludge treatment facilities to build slowly, substantial amounts of mud does not obtains minimizing, stabilisation, harmlessness disposing, according to town and country construction
Portion adds up, China's sludge treatment rate about 25%.
The ring that Environmental Protection Department is issued for 2010 is done in  No. 157 and is specified that " sewage treatment plant incites somebody to action to be stored as purpose
Mud transports factory circle, it is necessary to by sludge dewatering to moisture content less than 50% " standard-required.Within on 04 16th, 2015, State Council issues
" the water prevention and cure of pollution action plan " of cloth is distinctly claimed that " existing specific resistance to filtration facility should be basically completed and reach before the end of the year 2017
Mark transformation, region and above municipal sludge harmless treatment disposal rate should reach more than 90% before at the bottom of the year two thousand twenty ".
At present, Sludge Disposal Techniques mainly has burning, landfill and Land_use change, and processed has been the weight of final disposal
Want premise.And sludge dewatering is the crucial problem that solution is presently required, has currently for the sludge dewatering equipment of moisture content 99% and turn
Drum thickener, centrifugal concentrator, belt thickener machine, the sludge dewatering equipment for aqueous less than 95% has centrifugal dehydrator, van-type
Dewaterer, sheet frame dewaterer, barrier film dewaterer, wherein diaphragm filter press is inflatable or water-filling carries out secondary filter pressing thus dehydration effect
Moisture percentage in sewage sludge preferably, can be down to about 60% in the case of adding chemical agent, and need to add more than 30% (based on absolutely by fruit
Dewatered sludge amount) FeCl3To carry out chemical conditioning modified with the medicament such as CaO, moisture content of the cake minimum 60% after dehydration.As one need to be entered
Step reduces moisture percentage in sewage sludge, need to increase heat drying processing means, moisture percentage in sewage sludge is reduced to less than 40%.Heat drying obtains
Mud cake cannot be carried out Land_use change because of high pH, high calcium-containing amount, high chlorinity or directly burns, and can only carry out blended landfill, limit
Make the recycling of mud.Heat drying technology relies on natural gas, oil equal energy source, by thermal source heating dirt of burning
Mud, evaporates the moisture in mud and separates with mud granule, and therefore cost of investment and operating cost are higher, and more water factory cannot
Undertake the expense of its great number.
The existing sludge dehydrating and drying state of the art, sludge dewatering dosage is big, dehydration difficulty, and sludge drying is invested height, run
The problems such as expense is high；Need sludge condensation, sludge dewatering, sludge drying etc. three to overlap processing means, sludge drying could be realized
Summary of the invention
The present invention provides a kind of sludge semi-dry to process technique, only with sludge concentration tank and electro-osmosis device for dehydrating sladge waste
Moisture percentage in sewage sludge is down to less than 35% from 99.0%～99.7% by twice treatment process.
The technical scheme is that
A kind of sludge semi-dry processes technique, it is characterised in that: include sludge concentration device, electro-osmosis device for dehydrating sladge waste
Dehydration process steps, its step is as follows:
A thickening: sewage treatment plant produce moisture content 99.0%～99.7% mud through sludge condensation process after,
Obtain the mud of moisture content 96%～98%；
B sludge press filtration is dehydrated: the mud of moisture content 96%～98% delivers to electric osmose through mud screw pump after adding flocculant
Thoroughly device for dehydrating sladge waste, enters to carry out under mud pressure filter-press dehydration at screw pump, and mud pressure to be entered reaches 0.6MPa～1.0MPa
In time, stop into mud, and the hydraulic pressure squeezing continuing reliance on electro-osmosis sludge high-drying dehydration equipment obtains moisture content 88%～92%
C sludge drying is dehydrated: after obtaining the mud of moisture content 88%～92%, opens the electricity of electro-osmosis device for dehydrating sladge waste
Source, the common effect by electro-osmosis and hydraulic pressure is removed the moisture in mud, is obtained the mud cake of moisture content 35%.
Further, the flocculant used in above-mentioned steps b is appointing in polyacrylamide, natural minerals or bacteria agent
Meaning one, dosage is the 0.1%～5% of over dry sludge quantity.
Further, above-mentioned steps b, c all use electro-osmosis device for dehydrating sladge waste.
Further, the mud cake temperature obtained in above-mentioned steps c is 35 DEG C～60 DEG C, during Temperature fall, mud cake
Moisture content is reduced to less than 35%.
Further, above-mentioned sludge drying dehydration is: each filter chamber assembly is compressed by additional hydraulic jack, to filter chamber
Internal low-pressure hydraulic oil cylinder is passed through hydraulic oil, and oil cylinder piston is slowly advanced forward, and mud cake is compressed by the squeeze force of generation, mud cake
The middle water appeared by electric osmose flows out from the hole of hydraulic oil front bottom end through heat-resisting filter cloth, reaches to be dehydrated purpose again.
The present invention provides the benefit that in terms of existing technologies: the present invention has a following advantageous effect:
1), the present invention only realizes mud by " sludge concentration tank+electro-osmosis sludge high-drying dehydration equipment " two procedures
Mummification is dehydrated, and has technological process simple, easy and simple to handle, takes up an area the advantages such as little.
2) present invention only needs to add 0.1%～5% flocculant of over dry sludge quantity, it is not necessary to feeding lime, ferric chloride
Deng medicament, follow-up mud cake recycling.
3) present invention relies on electro-osmosis to realize sludge drying dehydration, removable mud intermediate gap water, suction under electric field action
Attached water, combine water and part intracellular water.
4) present invention can be used for newly-built sewage treatment plant or the transformation of existing sewage treatment plant, for built sludge concentration tank
Sewage Plant, after concentration basin, directly linking electro-osmosis sludge high-drying dehydration equipment realizes sludge drying dehydration.
5) Land_use change after the mud cake compost that the sludge dewatering and drying method that the present invention provides produces, also can be carried out individually
Burn, burning worked in coordination with by rubbish or burning etc. worked in coordination with by cement kiln, it is simple to following resourceization utilizes.
Accompanying drawing explanation
The invention will be further described with embodiment below in conjunction with the accompanying drawings:
Fig. 1 is the process chart of the sludge dehydration treatment technology of the present invention.
Fig. 2 provides electro-osmosis sludge high-drying dehydration equipment structural representation for the embodiment of the present invention；
Fig. 3 provides oil cylinder hydraulic squeezing filter chamber modular construction schematic diagram for the embodiment of the present invention；
Fig. 4 is the right view of Fig. 2；
Fig. 5 is the partial enlarged drawing of Fig. 3.
In figure: 1, Shaftless screw conveyor 2, storage mud tank 3, band feeder mud screw pump 4, Pneumatic three-way valve 5, sky
Press blowback system 6, high pressure cleaning pump 7, connect liquid turnover panel 8, frame 9, cylinder type circle squeezing filter chamber assembly 10, anode
Plate 11, distribution copper bar 12, heat-resisting filter cloth 13, mud cake 14, high-pressure cleaning system 15, pulling car 16, hydraulic means
17, high-frequency rectification power supply
901, hydraulic cylinder 903, oil cylinder piston 904, oil connection 905, insulation board 907, guide cylinder 908, negative electrode
Conduction filter screen 909, filter disc 910, filter chamber assembly handle.
Detailed description of the invention
Below in conjunction with the accompanying drawings the present invention is described further.
In conjunction with Fig. 1 and detailed description of the invention, the present invention is described in further detail:
Embodiment 1: using the mud of the sludge dewatering semi-oriented PROCESS FOR TREATMENT municipal sewage plant of the present invention, two sink
Pond produces the mud of moisture content 99.5%, after gravity concentration, obtains the thickened sludge of moisture content 97.3%.
Add and account for after the PAMC of over dry mud 0.3% mixs homogeneously with thickened sludge, through mud spiral shell
Bar transport pump carries out mummification dehydration to electro-osmosis sludge high-drying dehydration equipment.
The dehydration of electro-osmosis sludge high-drying dehydration equipment divides three phases, the first stage, enters mud pressure at mud screw pump
Carry out filter-press dehydration under power, stop into mud to entering after mud pressure is increased to 1.0MPa；Second stage, takes off at electro-osmosis sludge high-drying
Filter-press dehydration is carried out under the hydraulic action of wetting system；Phase III, electro-osmosis sludge high-drying dehydration equipment hydraulic coupling and
Electro-osmosis jointly acts on down and realizes sludge dehydrating and drying, obtains the mud cake of moisture content 40%～50%.
Mud cake temperature about 45 DEG C～55 DEG C after the process of electro-osmosis sludge high-drying dehydration equipment, during Temperature fall, mud
Cake moisture content is reduced to less than 35%.
See Fig. 2: a kind of electro-osmosis sludge high-pressure desiccation apparatus
This dehydration device includes: Shaftless screw conveyor 1 accepts external moisture content 80～90% mud, is transported to store up mud tank
In 2, band feeder mud screw pump 3 pumps mud to high pressure desiccation machine import by pipeline.At high-pressure and hydraulic pressure filter rack 8
On, arrange 40 groups of steel circle filter plates 9 and anode assembly 10.By one piece of built-in sun between every two pieces of adjacent steel round filter plates 9
Pole device adds heat-resisting filter cloth 12 and forms a Homogeneous Circular space with negative electrode filter disc.After mud pumps into, form circular mud cake 13.Circle
Shape mud cake 13 is clipped by the cylinder type squeezing cylinder barrel of filter chamber assembly 9, heat-resisting filter cloth 12 and anode assembly 10, and approximation regards electricity as
Resistance, forms uniform electric field.Electricity nose drawn by anode assembly 10, is connected on distribution copper bar 11 anode copper bar, is connected to by copper bar
On high-frequency rectification power supply 17 anode.Negative electrode conduction filter screen 908, is arranged on heat-resisting filter cloth rear, draws electricity nose, is connected by cable
To the negative electrode copper bar of distribution copper bar 11, it is connected on high-frequency rectification power supply 17 negative electrode by negative electrode copper bar.
High-frequency rectification power supply passes through pre-set programs, and according to pressure transmitter feedback signal, timing sends time variant voltage electric current.By
Level is loaded on negative electrode, anode.Stop mud cake generation electro-osmotic effects between the anode and cathode.Mud itself is charged glue
Body, resistance sizes is determined by mud electrical conductivity.Hydraulic means 16 provides plus high-pressure hydraulic coupling to compress each filter chamber by oil cylinder.
Being passed through hydraulic oil to the oil cylinder of cylinder type squeezing filter chamber assembly 9, the piston of hydraulic jack is advanced slowly, and gives circular mud
Cake applies pressure, and the water appeared by electric osmose in circular mud cake is discharged through heat-resisting filter cloth, it is achieved mud-water separation, reaches to be dehydrated mesh
It is blown into pressure-air before opening plate to be back to store up in mud tank to each filter chamber, the blowout non-mummification in filter chamber center sposh.Open
After filter chamber, it is passed through pressure-air from the hydraulic jack upper front end filter cloth back side, before filter cloth is blowed to by air, so that using mud cake
This electro-osmosis sludge high-pressure desiccation apparatus simple in construction, firmly, reliable, the life-span is long, it is possible to realize mud and contain
Water rate is reduced to less than 40%, improves twice dewatering efficiency than common diaphragm filter press, and because thrust required between filter chamber is little, can
To increase filter chamber quantity, improve treatment effeciency and the disposal ability of pressure filter.
As shown in Fig. 3, Fig. 4, Fig. 5: cylinder type squeezing filter chamber assembly 9 includes hydraulic cylinder 901, heat-resisting filter cloth 12, oil cylinder
Piston 903, oil connection 904, insulation board 905, positive plate 10, guide cylinder 907, negative electrode conduction filter screen 908, filter disc 909, filter chamber
Assembly handle 910；The most heat-resisting filter cloth 12, oil cylinder piston 903, insulation board 905, positive plate 10, negative electrode conduction filter screen 908, filter
The circular size of dish 909 and hydraulic cylinder 901 is suitable.
Hydraulic cylinder 901 one side is concavely formed squeezing filter chamber, and negative electrode conduction filter screen 908 is arranged on heat-resisting filter cloth 12 and filter disc
Between 909, draw electricity nose, be connected to the negative electrode copper bar of distribution copper bar 11 by cable, be connected to high frequency by negative electrode copper bar whole
On stream power supply 17 negative electrode.
Anode assembly 10 is arranged at the back side of hydraulic cylinder 901, is provided with insulation between anode assembly 10 and hydraulic cylinder 901
Plate 905；Electricity nose drawn by anode assembly 10, is connected on distribution copper bar 11 anode copper bar, is connected to high-frequency rectification electricity by copper bar
On the anode of source 17.Insulation board 905 is arranged between positive plate 10 and hydraulic cylinder 901 for preventing electric leakage.
Hydraulic cylinder 901 is provided with oil connection 904, is additionally provided with oil cylinder piston between filter disc 909 and hydraulic cylinder 901
903, oil connection 904 is connected with oil cylinder piston 903, and the central canal of hydraulic cylinder 901 is additionally provided with for oil cylinder piston
903 guide cylinders 907 guided, guide cylinder 907 is except guiding outer still feeding-passage.
This high level cadre's dehydration equipment specifically includes that low pressure, low pressure speed hydraulic jack；Water filtration disc；Conductive anode plate；Insulation board；
Negative electrode conduction filter screen；Heat-resisting filter cloth；Filter chamber handle；Guide cylinder.
Low-pressure hydraulic oil cylinder is arranged in frame by handle.Water filtration disc before oil cylinder piston, corrosion-resistant, high temperature resistant not
Rust steel negative electrode conduction filter screen, is fixed on water filtration disc, and negative electrode conduction draws electricity nose from the filter disc left and right sides, is connected to tough cathode
Row, is connected on high-frequency rectification power cathode by negative electrode copper bar.Heat-resisting filter cloth is arranged on before cathode screen, tight during filter cloth operation
Patch cathode screen.Positive plate is arranged on cylinder tube base plate, and is separated by insulation board between base plate, prevents positive plate short with cathode screen
Road.Positive plate draws wiring from two bottom sides, is connected on distribution copper bar anode copper bar, is connected to high frequency by anode copper bar
On rectifier power source anode.
Mud is squeezed into the filter chamber of low-pressure hydraulic oil cylinder with feeder mud screw pump, and it is adjacent that low-pressure hydraulic oil cylinder forms
Added heat-resisting filter cloth by positive plate between two filter chambers and form a uniform closing space with cathode filter screen.Mud is formed in this space
Mud cake clamped by cathode screen, heat-resisting filter cloth and anode, can approximate and regard circular resistance as, after logical unidirectional current, form uniform electricity
?.Mud itself is charged colloidal particle, and resistance sizes is determined by mud electrical conductivity.
High-frequency rectification power supply passes through pre-set programs, and according to mud cake pressure transmitter feedback signal, timing sends power transformation piezoelectricity
Stream, on multistage loadings to negative electrode, anode, forms uniform electric field between the most adjacent two pieces of filter plates.Mud cake occurs under electric field action
Electro-osmotic effects.Each filter chamber assembly is compressed by additional hydraulic jack, is passed through hydraulic oil to the low-pressure hydraulic oil cylinder within filter chamber,
Oil cylinder piston is slowly advanced forward, and mud cake is compressed by the squeeze force of generation, is aided with the moisture in the effect mud of electro-osmosis to the moon
Ghandler motion moves, and separates with mud granule with cathode filter screen through filter cloth, reach to be dehydrated purpose.
It is blown into compressed air before opening plate and enters mud cake center, blow out non-mummification sposh and be back to store up in mud tank.Open filter chamber
After, it is passed through pressure-air from the hydraulic jack upper front end filter cloth back side, before filter cloth is blowed to by air, so that mud cake comes off.
The above, the only preferable detailed description of the invention of the present invention, but scope is not limited thereto, and any
It is familiar with those skilled in the art of the present technique in the technical scope that the invention discloses, change can be readily occurred in or replace, all should contain
Within scope.Therefore, scope should be as the criterion with claims protection domain.