CN107673583A - Deeply dehydrating sludge processing method and sludge dewatering reaction system - Google Patents
Deeply dehydrating sludge processing method and sludge dewatering reaction system Download PDFInfo
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- CN107673583A CN107673583A CN201710906776.3A CN201710906776A CN107673583A CN 107673583 A CN107673583 A CN 107673583A CN 201710906776 A CN201710906776 A CN 201710906776A CN 107673583 A CN107673583 A CN 107673583A
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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
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
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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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/007—Contaminated open waterways, rivers, lakes or ponds
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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
- C02F2301/00—General aspects of water treatment
- C02F2301/06—Pressure conditions
- C02F2301/066—Overpressure, high pressure
Abstract
The invention provides a kind of deeply dehydrating sludge processing method and sludge dewatering reaction system, the processing method is：Sludge and propane react generation propane hydrate under the conditions of cryogenic high pressure, until the partial pressure of propane no longer declines, deeply dehydrating sludge process is completed；Sludge dewatering reaction system includes：High-pressure reactor, steel cylinder, water bath and cooler.The processing method of the present invention has the characteristics that to exempt from that conditioner adds, technique is simple, cost is cheap, it not only avoid the secondary environmental pollution risk caused by traditional sludge mechanical dehydration technique pre-conditioning adding of agent, and can also realize effective reduction of moisture percentage in sewage sludge simultaneously；In addition, after the completion of sludge dehydration process, the repeatable utilization of the propane of propane decomposition of hydrate and water can exempt to handle direct discharge, reduce consumption of the dewatering technology of mud to natural resources, therefore, processing method of the invention has higher economic benefit, social environment benefit and larger market application foreground.
Description
Technical field
The invention belongs to water-treatment technology field, and in particular to a kind of deeply dehydrating sludge processing method and sludge dewatering are anti-
Answer system.
Background technology
Sludge is the inevitable outcome of Sewage Biological Treatment, and it carries a large amount of pathogens, heavy metal and the organic dirt of toxic
Thing is contaminated, such as improper conduct oneself well is put, it will cause the risk of serious pollution environment.Since the 1990s, as China passes through
Ji builds the fast development with the level of urbanization, and sewage yield increasingly increases, and correspondingly sewage collecting handling rate also progressively carries
Height, and then produce a large amount of sludge.Therefore, a large amount of caused sludge are to China's environmental pollution prevention and control and the sustainable profit of social resources
With constituting severe challenge.
Due to the limitation of the factors such as technology, fund, there is the phenomenon of " the light mud of heavy water " in wastewater treatment in China industry, sludge
Safe handling disposal has turned into the weak link of field of water pollution control.About 80% sludge is not yet obtained at safe handling
Put, arbitrarily stockpiling becomes the primary discharge outlet of sewage plant sludge, the secondary pollution thereby resulted in not only serious threat dirt
Environmental quality near mud stockyard, but also runed counter to today's society conservation culture idea of development, therefore, safe efficient, section
Energy, the specific resistance to filtration technology of low cost have turned into the inevitable requirement and water pollution control technology main flow of environmental quality lifting
Development trend.
Deeply dehydrating sludge can effectively realize reducing sludge volume, reduce mobility, improve the purpose of incinerating combustion value, therefore, nothing
By being sludge transport, compost, burning, or solidification and stabilization, landfill, strict requirements are made that to the moisture content of sludge,
Such as《Urban sewage treatment plant sludge disposes blended landfill with shale (GB/T23485-2009)》Regulation sanitary landfills sludge contains
Water rate have to be lower than 60wt%；And have been generally acknowledged that the moisture content upper limit of sludge self-sustaining burning and should be 50wt%；For aerobic compost,
Then require that moisture percentage in sewage sludge is less than 60wt%, the gas transfer being otherwise unfavorable in heap body.In a word, high-moisture percentage characteristic is to restrict
The crucial controlling elements of sewage sludge harmlessness disposing, therefore sludge dewatering is to realize efficient sludge, low-cost processes and recycling profit
Important prerequisite.However, the composition of sludge composition is extremely complicated, the content of organic matter generally accounts for the 70- of total solids content
80wt%, and organic component has the hydrophily and retentiveness of height so that sludge is in the flocculation structure of colloidal, dewatering
Extreme difference.
At present, with aluminium polychloride (PAC), poly-ferric chloride (PFC), polyacrylamide (PAM) for representative coagulant,
Flocculant is still widely used sludge dehydration conditioner, and it changes sewage sludge solid by electrically neutralizing to act on adsorption bridging
The surface electrical behavior and coherent condition of grain, the gap water content of sludge can be reduced to a certain extent, promote the de- of sludge Free water
Remove, but obvious Action advantage is had no for surface attachment water and with reference to the removal of water, therefore after the above-mentioned traditional conditioner of use,
Mechanical dehydration is carried out again, and moisture percentage in sewage sludge can only be down to 80wt% or so.Furthermore aluminium polychloride (PAC), poly-ferric chloride
(PFC) add also introduces a large amount of chlorions into sludge, exacerbates bioxin in sludge incineration technique and generates risk, Fe3+
Introducing can then cause the corrosion of sludge treatment device, and polyacrylamide (PAM) adds the propylene unavoidably introduced
Amide monomer has long-term environment preservation characteristic and potential source biomolecule toxicity, and drawbacks described above seriously limits conventional dehydration conditioner
Sustainable popularization and application.In addition, for deep sludge dewatering process, quick lime is able to extensively as dehydrating and curing medicament
General use, but dosage is generally up to the 10-15wt% of sludge weight in wet base, and dosage is high, increase-volume is than big, conditioning of mud pH value to alkalescence
Sludge following resourceization is restricted using the principal element with treatment effeciency Deng conventional dehydration curing agent is become.Therefore, simultaneous
On the premise of caring for environment, social and economic benefit balance, the efficient deep dehydration technology of sludge for exempting from conditioning has wide market
Application prospect and social environment benefit.
The content of the invention
In view of the shortcomings of the prior art, primary and foremost purpose is to provide a kind of deeply dehydrating sludge processing method to the present invention, at this
Reason method have the characteristics that to exempt from conditioner add, technological process it is simple and easy.
Second object of the present invention is to provide a kind of sludge dewatering reaction system for realizing above-mentioned processing method.
Third object of the present invention is the method that deeply dehydrating sludge is carried out using above-mentioned sludge dewatering reaction system.
To reach above-mentioned purpose, solution of the invention is：
A kind of deeply dehydrating sludge processing method, it comprises the following steps：
(1), sludge is added in high-pressure reactor；
(2) propane, is passed through into high-pressure reactor；
(3) sludge and propane is reacted at a constant temperature and generate propane hydrate (C3H8·17H2O), with propane water
Compound (C3H8·17H2O) progress of course of reaction, the partial pressure of propane are down to vapor pressure；
(4) number for, repeating step (2) and step (3) is n-1 times, until third during propane hydrate reaction
The partial pressure of alkane no longer declines, and discharges pressure, discharges dewatered sludge.
Preferably, in step (1), sludge is the excess sludge of sewage treatment plant or the Dredged bed mud in river lake.
Preferably, in step (1), the moisture content of sludge is 95-99%.
Preferably, in step (1), after sludge adds high-pressure reactor, the temperature of high-pressure reactor is adjusted to 1-4 DEG C.
Preferably, in step (2), the partial pressure for being passed through propane after propane reaches 400-500kPa, and propane is commercial propane, its
Purity ＞ 95%.
Preferably, in step (3), vapor pressure 169-396kPa.
Preferably, in step (4), n span is the integer in 16-41.
A kind of sludge dewatering reaction system for realizing above-mentioned deeply dehydrating sludge processing method, it includes：
High-pressure reactor, for carrying out deeply dehydrating sludge process；
Steel cylinder, for providing propane, steel cylinder is connected with high-pressure reactor；The material of steel cylinder is stainless steel；
Water bath, for adjusting the temperature value of high-pressure reactor, high-pressure reactor is located in water bath；
Cooler, for adjusting the temperature value of water bath, cooler is connected with water bath.
Further, sludge dewatering reaction system also includes：Support, for supporting the top of water bath and high-pressure reactor.
The material of support is stainless steel.
In fact, high-pressure reactor includes：
Reactor body, for storing sludge；
Sludge ascending pipe, for sludge to be injected in reactor body；
Pressure-reducing valve, for being passed through propane；
Pressure gauge, for showing the pressure value in reactor body；
Pressure relieving valve, for the intrinsic pressure of releasing reactor；
Quck-opening valve, for discharging dewatered sludge.
Further, high-pressure reactor also includes：Reactor form, for propane hydrate in observing response device body and dirt
The separation situation of mud.
Preferably, reactor body is shaped as cylinder, and cross section is circle；The height of high-pressure reactor is 30-
150cm, the basal diameter of high-pressure reactor is 5-30cm.
Preferably, water bath is tubular glass jar；The height of water bath is 45-180cm, and the bottom surface of water bath is straight
Footpath is 30-50cm.
A kind of method that deeply dehydrating sludge is handled using above-mentioned sludge dewatering reaction system, it comprises the following steps：
(a), sludge is added in the reactor body of high-pressure reactor by the sludge ascending pipe of high-pressure reactor, passed through
Cooler adjusts the temperature for the water bath being placed on support so that the temperature of the high-pressure reactor in water bath is down to 1-
4 DEG C and keep；
(b), by the pressure-reducing valve of high-pressure reactor, the propane in steel cylinder is passed through to the reactor body of high-pressure reactor
It is interior；
(c) temperature of the reaction system of step (a) and step (b), is maintained to 1-4h, sludge and propane is reacted life
Into propane hydrate, with the progress of propane hydrate reaction process, the partial pressure of propane is gradually decreased to vapor pressure；
(d) number for, repeating step (b) and step (c) is n-1 times, until third during propane hydrate reaction
The partial pressure of alkane no longer declines, and by the pressure relieving valve of high-pressure reactor, the pressure in the reactor body of high-pressure reactor is discharged,
Dewatered sludge is discharged by the quck-opening valve of high-pressure reactor out of high-pressure reactor reactor body.
Wherein, discharge and the temperature of high-pressure reactor risen to 5-10 DEG C after dewatered sludge, propane decomposition of hydrate be water and
Propane, water directly discharges or reuse, and propane, which is collected, to be waited to reuse.
Preferably, in step (a), the sludge in the reactor body of high-pressure reactor is the excess sludge of sewage treatment plant
Or the Dredged bed mud in river lake.
Preferably, in step (a), the moisture content of the sludge in the reactor body of high-pressure reactor is 95-99%.
Preferably, in step (b), the partial pressure that propane after propane is passed through in the reactor body of high-pressure reactor reaches 400-
500kPa, propane are commercial propane, purity ＞ 95%.
Preferably, in step (c), the vapor pressure of propane is 169-396kPa.
Preferably, in step (d), n span is the integer in 16-41.
Due to using such scheme, the beneficial effects of the invention are as follows：
The processing method of the present invention is simple and easy, and is added and sludge pretreatment technique without other sludge industrial conditioners
Process, can overcome before traditional sludge mechanical dehydration technique added amount of chemical is high, sludge increase-volume than greatly, sludge dewatering efficiency it is low,
The shortcomings of removing water still needs to further handle, not only reduce sludge conditioner and add issuable secondary environmental pollution risk,
And effective reduction of moisture percentage in sewage sludge can be also realized simultaneously；In addition, after the completion of the deeply dehydrating sludge processing procedure of the present invention,
The repeatable utilization of propane and water after propane decomposition of hydrate can exempt to handle direct discharge, reduce the consumption of natural resources
With process operation cost, therefore, processing method of the invention has higher economic benefit, social environment benefit and larger city
Field application prospect.
Brief description of the drawings
Fig. 1 is the sludge dewatering reaction system schematic diagram for realizing the deeply dehydrating sludge processing method of the present invention.
Fig. 2 is the sludge dewatering course of reaction schematic diagram of the deeply dehydrating sludge processing method of the present invention.
Fig. 3 be embodiments of the invention 1 deeply dehydrating sludge processing procedure in sludge biodiversity balanced distribution figure.
Reference：
Support 1, pressure gauge 2, pressure-reducing valve 3, gas enter pipe 4, gas discharge pipe 5, pressure relieving valve 6, freezing liquid circulation pipe 7,
Reactor form 8, quck-opening valve 9, cooler 10, sludge ascending pipe 11, water bath 12, reactor body 13, high-pressure reactor 14,
Sludge 15 and propane hydrate 16.
Embodiment
The invention provides a kind of deeply dehydrating sludge processing method and sludge dewatering reaction system.
<Deeply dehydrating sludge processing method>
A kind of deeply dehydrating sludge processing method, it comprises the following steps：
(1), sludge is added in high-pressure reactor；
(2) propane, is passed through into high-pressure reactor；
(3) temperature of the reaction system of step (1) and step (2), is maintained sludge is sent out at a constant temperature with propane to 1-4h
Raw reaction generation propane hydrate (C3H8·17H2O), with propane hydrate (C3H8·17H2O) the progress of course of reaction, third
The partial pressure of alkane is down to vapor pressure；
(4) number for, repeating step (2) and step (3) is n-1 times, until third during propane hydrate reaction
The partial pressure of alkane no longer declines, and discharges pressure, discharges dewatered sludge.
Wherein, in step (1), sludge is the excess sludge of sewage treatment plant or the Dredged bed mud in river lake.
In step (1), the moisture content of sludge can be 95-99%, preferably 98.8%.
In step (1), after sludge adds high-pressure reactor, the temperature of high-pressure reactor is adjusted to 1-4 DEG C, is preferably
1.5℃。
In step (2), the partial pressure for being passed through propane after propane reaches 400-500kPa, preferably 450kPa；Propane is work
Industry propane, its purity ＞ 95%.
Wherein, under the conditions of low temperature (1-4 DEG C) high pressure (400-500kPa), propane and sludge fully contact and react generation
Propane hydrate (C3H8·17H2O)。
In step (3), vapor pressure can be 169-396kPa, preferably 207kPa.
In step (4), n span is the integer in 16-41, and n is preferably 16.
In fact, be constantly passed through the process of propane, both supplemented with propane hydrate reaction needed for propane, while again in
The propane gas hydrate synthesis backwater effect of sludge and the propane generation of flocculation structure, because the density of propane hydrate is less than dehydration
The density of the liquid-phase system (generating the remaining sludge system after propane hydrate) of sludge afterwards, so that propane is hydrated
Thing will gradually float and rest at the gas liquid film of the liquid-phase system of propane and above-mentioned sludge, realize the moisture in sludge
With efficiently separating for the solid phase components in sludge.
With the continuous progress of propane hydrate reaction process, the partial pressure of propane is down to vapor pressure, until propane water
In compound course of reaction propane partial pressure (now the partial pressure of propane between propane initial pressure and propane vapor pressure it
Between) no longer decline, illustrate the moist part in sludge or be completely converted into propane hydrate, be i.e. deeply dehydrating sludge process is complete
Into, it is achieved thereby that the purpose that the moisture in sludge is extracted and separated from sludge, is then discharged out dewatered sludge, dewatered sludge
Solid phase components can further discharge burning or landfill stabilization；The temperature of high-pressure reactor is risen to 5-10 DEG C afterwards, propane hydration
Thing is decomposed into water and propane, and water directly discharges or reuse, and propane, which is collected, to be waited to reuse.
<Sludge dewatering reaction system>
As shown in figure 1, a kind of sludge dewatering reaction system for realizing above-mentioned deeply dehydrating sludge processing method includes：It is high
Press reactor 14, steel cylinder (being not shown in figure), water bath 12, cooler 10 and support 1.
Wherein, high-pressure reactor 14 is used to carry out deeply dehydrating sludge process.The reactor body of high-pressure reactor 14
Cylinder is shaped as, cross section is circle；The height of high-pressure reactor 14 can be 30-150cm, preferably 35 ± 0.5cm, more
Preferably 35cm；The basal diameter of high-pressure reactor 14 can be 5-30cm, preferably 6.5 ± 0.5cm, more preferably 6.5cm.
Steel cylinder is used to provide propane；Steel cylinder is connected with high-pressure reactor 14.The material of steel cylinder is stainless steel.
Water bath 12 is used for the temperature value for adjusting high-pressure reactor 14, wherein, high-pressure reactor 14 is located in water bath 12.
Water bath 12 is tubular glass jar；The height of water bath 12 can be 45-180cm, preferably 45 ± 5cm, more preferably
For 45cm；The basal diameter of water bath 12 can be 30-50cm, preferably 30 ± 3cm, more preferably 30cm.
Cooler 10 is used for the temperature value for adjusting water bath 12, wherein, cooler 10 passes through freezing liquid circulation pipe 7 and water-bath
Groove 12 connects.
Support 1 is used for the top for supporting water bath 12 and high-pressure reactor 14, and the material of support 1 is stainless steel.
Further, high-pressure reactor 14 includes：Reactor body 13, sludge ascending pipe 11, pressure-reducing valve 3, pressure gauge 2, release
Pressure valve 6, quck-opening valve 9 and reactor form 8.
Wherein, reactor body 13 is used to store sludge；Sludge ascending pipe 11 is used to sludge injecting reactor body 13
It is interior；Pressure-reducing valve 3 is used to be passed through propane；Pressure gauge 2 is used to show the pressure value in reactor body 13；Pressure relieving valve 6 is used to discharge
Pressure in reactor body 13；Quck-opening valve 9 is used to discharge dewatered sludge, and reactor form 8 is used for observing response device body 13
The separation situation of interior propane hydrate and sludge.
Sludge ascending pipe 11 is connected with the upper end of reactor body 13, and pressure-reducing valve 3 enters pipe 4 and reactor sheet by gas
The lower end connection of body 13, pressure gauge 2 are connected by pipeline with the upper end of reactor body 13, and pressure relieving valve 6 passes through gas discharge pipe 5
With answering the upper end of device body 13 to be connected, quck-opening valve 9 is connected by pipeline with the lower end of reactor body 13, and reactor form 8 is embedding
Close in reactor body 13.
<The method that sludge dewatering reaction system handles deeply dehydrating sludge>
A kind of method that deeply dehydrating sludge is handled using above-mentioned sludge dewatering reaction system, as depicted in figs. 1 and 2,
It comprises the following steps：
(a), sludge 15 is added to the reactor sheet of high-pressure reactor 14 by the sludge ascending pipe 11 of high-pressure reactor 14
In body 13, cooler 10 adjusts the temperature for the water bath 12 being placed on support 1 by freezing liquid circulation pipe 7 so that positioned at water
The temperature of high-pressure reactor 14 in bath 12 is down to 1-4 DEG C and kept；
(b), steel cylinder is connected with high-pressure reactor 14, passes through the pressure-reducing valve 3 and high-pressure reactor 14 of high-pressure reactor 14
Gas enter pipe 4, the propane in steel cylinder is passed through in the reactor body 13 of high-pressure reactor 14；
(c) temperature of the reaction system of step (a) and step (b), is maintained sludge 15 is reacted with propane to 1-4h
Propane hydrate 16 is generated, with the progress of the course of reaction of propane hydrate 16, the partial pressure of propane is gradually decreased to vapor pressure；
(d) number for, repeating step (b) and step (c) is n-1 times, until in the course of reaction of propane hydrate 16
The partial pressure of propane no longer declines, by the pressure relieving valve 6 of high-pressure reactor 14 and the gas discharge pipe 5 of high-pressure reactor 14, by height
The pressure release in the reactor body 13 of reactor 14 is pressed, by dewatered sludge by the quck-opening valve 9 of high-pressure reactor 14 from height
Press in the reactor body 13 of reactor 14 and discharge；
(e), cooler 10 adjusts the temperature of water bath 12 by freezing liquid circulation pipe 7 so that high-pressure reactor 14
Temperature rises to 5-10 DEG C, and propane hydrate 16 is decomposed into water and propane, and water is anti-from high pressure by the quck-opening valve 9 of high-pressure reactor 14
Answer directly discharge or reuse, the pressure relieving valve 6 and reaction under high pressure that propane passes through high-pressure reactor 14 in the reactor body 13 of device 14
The gas discharge pipe 5 of device 14 is collected out of high-pressure reactor 14 reactor body 13 and out waits to reuse.
Wherein, in step (a), the sludge in the reactor body of high-pressure reactor is the excess sludge of sewage treatment plant
Or the Dredged bed mud in river lake.
In step (a), the moisture content of the sludge in the reactor body of high-pressure reactor is 95-99%.
In step (b), the partial pressure that propane after propane is passed through in the reactor body of high-pressure reactor reaches 400-
500kPa, propane are commercial propane, its purity ＞ 95%.
In step (c), the vapor pressure of propane is 169-396kPa.
In step (d), n span is the integer in 16-41.
In a word, the present invention is based under the conditions of cryogenic high pressure, and propane is as the moisture in host molecule, sludge as object
Molecule generates the principle of clathrate hydrate, it is achieved thereby that the moisture in sludge is extracted from the sludge in flocculation structure, converted
With the purpose for efficiently separating, removing, the deep dehydration process of sludge is completed, and then discharges dewatered sludge, further such that propane
Propane after decomposition of hydrate, which is collected, to be waited to reuse, and the water after propane decomposition of hydrate exempts to handle direct discharge.
The present invention will be further described with reference to the accompanying drawings.
Embodiment 1：
The deeply dehydrating sludge processing method of the present embodiment comprises the following steps：
(1) the second pond sludge (moisture content 98.8%) of 0.2L Shanghai City Quyang sewage treatment plants, is passed through into height
The sludge ascending pipe of reactor (being highly 35cm, basal diameter 6.5cm) is pressed to add in the reactor body of high-pressure reactor,
Cooler adjusts the temperature of the water bath being placed on support (being highly 45cm, basal diameter 30cm) by freezing liquid circulation pipe
Degree so that the temperature of the high-pressure reactor in water bath is down to 1.5 DEG C and kept；
(2), steel cylinder is connected with high-pressure reactor, entered by the pressure-reducing valve of high-pressure reactor and the gas of high-pressure reactor
Enter pipe, the propane in steel cylinder is passed through in high-pressure reactor and propylene partial pressures is reached 450KPa；
(3) temperature (1.5 DEG C) of the reaction system of step (1) and step (2), is maintained to 2h, as propane and sludge are anti-
The progress of propane hydrate process should be generated, the partial pressure of propane is down to vapor pressure 207KPa；
(4) number for, constantly repeating step (2) and step (3) is 15 times, until during propane hydrate reaction
The partial pressure of propane no longer declines, and the water transform in sludge is propane hydrate, then by the pressure relieving valve of high-pressure reactor and
The gas discharge pipe of high-pressure reactor, the pressure in the reactor body of high-pressure reactor is discharged, dewatered sludge is passed through into height
The quck-opening valve of pressure reactor is discharged out of high-pressure reactor reactor body, wherein, step (2) and step (3) are defined as
Batch-type reaction, the present embodiment carry out batch-type and reacted 16 times altogether；
(5) cooling system of cooler, is closed, the temperature of water bath is adjusted by freezing liquid circulation pipe so that high pressure
The temperature of reactor rises to 5 DEG C, and propane decomposition of hydrate is water and propane, and water is anti-from high pressure by the quck-opening valve of high-pressure reactor
Direct discharge or reuse, propane in the reactor body of device is answered to pass through the pressure relieving valve of high-pressure reactor and the gas of high-pressure reactor
Delivery pipe is collected out of high-pressure reactor reactor body out to be waited to reuse, wherein, the water after propane decomposition of hydrate
In pollutant (i.e. COD COD (Chemical Oxygen Demand), total nitrogen TN (Total Nitrogen) and total
Phosphorus TP (Total Phosphorus)) performance number it is as shown in table 1.
The performance number of the pollution physical property of the discharge water for the dewatering technology of mud that table 1 is generated based on propane hydrate
As shown in Table 1, COD, the total values of nitrogen might of the discharge water of the dewatering technology of mud based on the generation of propane hydrate
It is satisfied by with total phosphorus value《Urban wastewater treatment firm pollutant catabolic gene standard (GB18918-2002)》I level B discharge standards, therefore should
Discharging water can directly discharge in order to avoid handling.
From the figure 3, it may be seen that when the sludge dehydration process of the present embodiment proceeds to the 15th batch-type reaction, do not have completely in sludge
With the presence of residual water, illustrate that the moisture in sludge is completely converted into propane hydrate, i.e. deeply dehydrating sludge process has been carried out
Finish.
Wherein, the moisture content of sludge is possible within 95-99%.
The temperature of high-pressure reactor is possible within 1-4 DEG C.
Be passed through the partial pressure of propane after propane within 400-500kPa, vapor pressure is within 169-396kPa and can
With.
The height of reactor body is within 30-150cm, basal diameter is possible within 5-30cm.
The height of water bath is within 45-180cm, basal diameter is also possible within 30-50cm.
Embodiment 2：
The deeply dehydrating sludge processing method of the present embodiment comprises the following steps：
(1), (highly it is by high-pressure reactor by the Dredged bed mud (moisture content 95%) in 0.2L Jiaxing Cities river course
35cm, basal diameter 6.5cm) sludge ascending pipe add high-pressure reactor reactor body in, cooler passes through freezing
Liquid circulation pipe adjusts the temperature of the water bath being placed on support (being highly 45cm, basal diameter 30cm) so that positioned at water
The temperature of high-pressure reactor in bath is down to 1.5 DEG C and kept；
(2), steel cylinder is connected with high-pressure reactor, entered by the pressure-reducing valve of high-pressure reactor and the gas of high-pressure reactor
Enter pipe, the propane in steel cylinder is passed through in high-pressure reactor and propylene partial pressures is reached 450KPa；
(3) temperature (2.5 DEG C) of the reaction system of step (1) and step (2), is maintained to 2h, with propane and dredging bottom
The progress of mud reaction generation propane hydrate process, the partial pressure of propane are down to vapor pressure 287KPa；
(4) number for, constantly repeating step (2) and step (3) is 19 times, until during propane hydrate reaction
The partial pressure of propane no longer declines, and the water transform in Dredged bed mud is propane hydrate, then passes through the release of pressure of high-pressure reactor
The gas discharge pipe of valve and high-pressure reactor, the pressure in the reactor body of high-pressure reactor is discharged, bottom is dredged into dehydration
Mud (moisture content 48.9%) is discharged by the quck-opening valve of high-pressure reactor out of high-pressure reactor reactor body, wherein,
Step (2) and step (3) are defined as a batch-type reaction, the present embodiment carries out batch-type and reacted 20 times altogether；
(5) cooling system of cooler, is closed, the temperature of water bath is adjusted by freezing liquid circulation pipe so that high pressure
The temperature of reactor rises to 7 DEG C, and propane decomposition of hydrate is water and propane, and water is anti-from high pressure by the quck-opening valve of high-pressure reactor
Direct discharge or reuse, propane in the reactor body of device is answered to pass through the pressure relieving valve of high-pressure reactor and the gas of high-pressure reactor
Delivery pipe is collected out of high-pressure reactor reactor body out to be waited to reuse, wherein, the water after propane decomposition of hydrate
In pollutant (i.e. COD COD (Chemical Oxygen Demand), total nitrogen TN (Total Nitrogen) and total
Phosphorus TP (Total Phosphorus)) performance number it is as shown in table 2.
The performance number of the pollution physical property of the discharge water for the dewatering technology of mud that table 2 is generated based on propane hydrate
As shown in Table 2, COD, the total values of nitrogen might of the discharge water of the dewatering technology of mud based on the generation of propane hydrate
It is satisfied by with total phosphorus value《Urban wastewater treatment firm pollutant catabolic gene standard (GB18918-2002)》I level emission standard As, therefore should
Discharging water can directly discharge in order to avoid handling.
Embodiment 3：
The deeply dehydrating sludge processing method of the present embodiment comprises the following steps：
(1), the excess sludge (moisture content 99%) of 0.2L Pudong New Area, Shanghai large-scale wastewater treatment plant is passed through
The sludge ascending pipe of high-pressure reactor (being highly 35cm, basal diameter 6.5cm) adds the reactor body of high-pressure reactor
Interior, cooler adjusts the water bath being placed on support (being highly 45cm, basal diameter 30cm) by freezing liquid circulation pipe
Temperature so that the temperature of the high-pressure reactor in water bath is down to 3.5 DEG C and kept；
(2), steel cylinder is connected with high-pressure reactor, entered by the pressure-reducing valve of high-pressure reactor and the gas of high-pressure reactor
Enter pipe, the propane in steel cylinder is passed through in high-pressure reactor and propylene partial pressures is reached 450KPa；
(3) temperature (3.5 DEG C) of the reaction system of step (1) and step (2), is maintained to 1h, as propane and residue are dirty
The progress of mud reaction generation propane hydrate process, the partial pressure of propane are down to vapor pressure 356KPa；
(4) number for, constantly repeating step (2) and step (3) is 39 times, until during propane hydrate reaction
The partial pressure of propane no longer declines, and the water transform in excess sludge is propane hydrate, then passes through the release of pressure of high-pressure reactor
The gas discharge pipe of valve and high-pressure reactor, the pressure in the reactor body of high-pressure reactor is discharged, dehydration is remaining dirty
Mud (moisture content 28.6%) is discharged by the quck-opening valve of high-pressure reactor out of high-pressure reactor reactor body, wherein,
Step (2) and step (3) are defined as a batch-type reaction, the present embodiment carries out batch-type and reacted 40 times altogether；
(5) cooling system of cooler, is closed, the temperature of water bath is adjusted by freezing liquid circulation pipe so that high pressure
The temperature of reactor rises to 8 DEG C, and propane decomposition of hydrate is water and propane, and water is anti-from high pressure by the quck-opening valve of high-pressure reactor
Direct discharge or reuse, propane in the reactor body of device is answered to pass through the pressure relieving valve of high-pressure reactor and the gas of high-pressure reactor
Delivery pipe is collected out of high-pressure reactor reactor body out to be waited to reuse, wherein, the water after propane decomposition of hydrate
In pollutant (i.e. COD COD (Chemical Oxygen Demand), total nitrogen TN (Total Nitrogen) and total
Phosphorus TP (Total Phosphorus)) performance number it is as shown in table 3.
The performance number of the pollution physical property of the discharge water for the dewatering technology of mud that table 3 is generated based on propane hydrate
As shown in Table 3, COD, the total values of nitrogen might of the discharge water of the dewatering technology of mud based on the generation of propane hydrate
It is satisfied by with total phosphorus value《Urban wastewater treatment firm pollutant catabolic gene standard (GB18918-2002)》I level emission standard As, therefore should
Discharging water can directly discharge in order to avoid handling.
In summary, the reaction temperature in the high-pressure reactor of embodiment 1, embodiment 2 and embodiment 3 is different, different anti-
The partial pressure difference that balances each other of propane corresponding to temperature is answered, after causing to carry out a batch-type reaction, reaches the partial pressure that balances each other
When propane consumption it is also different, therefore, the yield of the propane hydrate of batch-type reaction is also different, and sludge deep
Batch-type reaction times needed for dehydration are different, and then after the completion of causing deeply dehydrating sludge, and the moisture content of dewatered sludge is not yet
Together.
The above-mentioned description to embodiment is that this hair is understood that and used for the ease of those skilled in the art
It is bright.Those skilled in the art obviously can readily make various modifications to these embodiments, and described herein one
As principle be applied in other embodiment, without by performing creative labour.Therefore, the invention is not restricted to above-described embodiment.
Those skilled in the art do not depart from improvement that scope of the invention made and modification all should be at these according to the principle of the present invention
Within the protection domain of invention.
Claims (10)
- A kind of 1. deeply dehydrating sludge processing method, it is characterised in that：It comprises the following steps：(1), sludge is added in high-pressure reactor；(2), it is passed through propane into the high-pressure reactor；(3) sludge is reacted at a constant temperature with the propane and generate propane hydrate, with propane hydrate reaction The progress of process, the partial pressure of the propane are down to vapor pressure；(4) number for, repeating the step (2) and the step (3) is n-1 times, until propane hydrate reaction process The partial pressure of middle propane no longer declines, and discharges pressure, discharges dewatered sludge.
- 2. deeply dehydrating sludge processing method according to claim 1, it is characterised in that：In step (1), the sludge is The excess sludge of sewage treatment plant or the Dredged bed mud in river lake；And/orIn step (1), the moisture content of the sludge is 95-99%.
- 3. deeply dehydrating sludge processing method according to claim 1, it is characterised in that：In step (1), the sludge adds After entering high-pressure reactor, the temperature of the high-pressure reactor is adjusted to 1-4 DEG C；And/orIn step (2), the partial pressure for being passed through propane after propane reaches 400-500kPa, the purity ＞ 95% of the propane.
- 4. deeply dehydrating sludge processing method according to claim 1, it is characterised in that：It is described to balance each other in step (3) Pressure is 169-396kPa；And/orIn step (4), the span of the n is the integer in 16-41.
- A kind of 5. sludge dewatering reaction system for realizing the deeply dehydrating sludge processing method as described in claim any one of 1-4 System, it is characterised in that：It includes：High-pressure reactor, for carrying out deeply dehydrating sludge process；Steel cylinder, for providing propane, the steel cylinder is connected with the high-pressure reactor；Water bath, for adjusting the temperature value of the high-pressure reactor, the high-pressure reactor is located in the water bath；Cooler, for adjusting the temperature value of the water bath, the cooler is connected with the water bath.
- 6. sludge dewatering reaction system according to claim 5, it is characterised in that：It includes：Support, it is described for supporting The top of water bath and the high-pressure reactor；And/orThe material of the support is stainless steel.
- 7. sludge dewatering reaction system according to claim 5, it is characterised in that：The high-pressure reactor includes：Reactor body, for storing sludge；Sludge ascending pipe, for the sludge to be injected in the reactor body；Pressure-reducing valve, for being passed through propane；Pressure gauge, for showing the pressure value in the reactor body；Pressure relieving valve, for discharging the pressure in the reactor body；Quck-opening valve, for discharging dewatered sludge；And/orThe material of the steel cylinder is stainless steel；And/orThe water bath is tubular glass jar；The height of the water bath is 45-180cm, the bottom surface of the water bath A diameter of 30-50cm.
- 8. sludge dewatering reaction system according to claim 7, it is characterised in that：The high-pressure reactor includes：Reaction Device form, for the separation situation of propane hydrate and sludge in observing response device body；And/orThe reactor body is shaped as cylinder, and cross section is circle；The height of the reactor body is 30-150cm, The basal diameter of the reactor body is 5-30cm.
- A kind of 9. side of sludge dewatering reaction system processing deeply dehydrating sludge using as described in claim any one of 5-8 Method, it is characterised in that：It comprises the following steps：(a), sludge is added in the reactor body of the high-pressure reactor by the sludge ascending pipe of high-pressure reactor, passed through Cooler adjusts the temperature for the water bath being placed on support so that the temperature of the high-pressure reactor in the water bath Degree is down to 1-4 DEG C and kept；(b), by the pressure-reducing valve of the high-pressure reactor, the propane in steel cylinder is passed through to the reactor sheet of the high-pressure reactor In vivo；(c) temperature of the reaction system of the step (a) and the step (b), is maintained to make the sludge and described third to 1-4h Alkane is reacted generation propane hydrate, and with the progress of propane hydrate reaction process, the partial pressure of the propane is down to equal Weigh pressure；(d) number for, repeating the step (b) and the step (c) is n-1 times, until propane hydrate reaction process The partial pressure of middle propane no longer declines, by the pressure relieving valve of the high-pressure reactor, by the reactor body of the high-pressure reactor Interior pressure release, the reactor body by dewatered sludge by the quck-opening valve of the high-pressure reactor from the high-pressure reactor Interior discharge.
- 10. according to the method for claim 9, it is characterised in that：In the step (a), the reactor sheet of high-pressure reactor Internal sludge is the excess sludge of sewage treatment plant or the Dredged bed mud in river lake；And/orIn the step (a), the moisture content of the sludge in the reactor body of high-pressure reactor is 95-99%；And/orIn the step (b), the partial pressure that propane after propane is passed through in the reactor body of high-pressure reactor reaches 400-500kPa, The purity ＞ 95% of propane；And/orIn the step (c), the vapor pressure of propane is 169-396kPa；And/orIn the step (d), n span is the integer in 16-41.
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| CN113354251A (en) * | 2021-06-07 | 2021-09-07 | 郑州轻工业大学 | Rapid concentration and purification treatment device and method for hydrate sludge |
| CN114772903A (en) * | 2022-05-13 | 2022-07-22 | 大连理工大学 | Sludge conditioning and deep dehydration device and method based on hydrate method |
| CN115340285A (en) * | 2022-08-31 | 2022-11-15 | 同济大学 | Method and system for improving sludge solid-liquid separation performance through moisture in-situ crystallization |
| CN115417577A (en) * | 2022-05-13 | 2022-12-02 | 大连理工大学 | Normal-pressure continuous sludge conditioning system and method based on hydrate method |
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