CN103359898B - Method and apparatus for sludge deep treatment and resource utilization - Google Patents

Method and apparatus for sludge deep treatment and resource utilization Download PDF

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CN103359898B
CN103359898B CN201310327013.5A CN201310327013A CN103359898B CN 103359898 B CN103359898 B CN 103359898B CN 201310327013 A CN201310327013 A CN 201310327013A CN 103359898 B CN103359898 B CN 103359898B
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sludge
mud
rupture
agent
membranes
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CN201310327013.5A
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CN103359898A (en
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卢欢亮
叶向东
汪永红
李朝晖
黄志华
王刚
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广东省环境科学研究院
广东环科院环境科技有限公司
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00Technologies for wastewater treatment
    • Y02W10/40Valorisation of by-products of wastewater, sewage or sludge processing

Abstract

The invention relates to a method and an apparatus for sludge deep treatment and resource utilization. According to the method, the sludge is treated by using a combined process of conditioning, rupturing membrane, adding materials, removing water, drying rapidly and pyrolyzing the sludge at a low temperature. The sludge is treated by a treatment apparatus comprising a sludge conditioning material-feeding system, a sludge membrane-rupturing reactor, a sludge dewatering machine, a sludge dryer, a sludge pyrolyzing furnace, a biomass fuel heating supply system and a flue gas purification system. The method can overcome the disadvantages of high energy consumption and low efficiency of a conventional process. A biochar product with excellent performance and high environmental safety can be obtained, and reduction, harmlessness and resource of the sludge can be realized.

Description

Sludge deep process and resource utilization method and device thereof

Technical field

The present invention relates to sludge deep process and resource utilization method and device, be specifically related to the combination process lignin-sludge using rupture of membranes, dehydration, drying, pyrolysis, and generate the method and apparatus of charcoal, be specially adapted to the excess sludge that sewage treatment plants produces, and the industrial sludge of the industry such as printing and dyeing, weaving, papermaking generation.

Background technology

Mud is the by product in sanitary sewage and During Industrial Wastewater Treatment Process.Along with the fast development of China's economy, the production-scale expansion of industrial enterprise, sludge yield is increasing year by year.Delayed due to sludge disposal technology, it is full of suffering from hopeless predicament that a lot of sewage work and enterprise face " mud ".In recent years, because mud is caused serious Environment Pollution Event to appear in the newspapers repeatly by arbitrarily toppling over, the concern of government and the public is caused.

The output of current China mud is large, water ratio is high, sludge disposal technology is uneven, mainly save as master with simple landfill or heap, but a large amount of mud does not reach the landfill yard admissions criteria of water ratio less than 60%, stabilization, harmless treatment disposal rate are lower, both be unfavorable for the utilization of resources, easily cause secondary pollution problem again.On the other hand, to flourishing cities such as Guangzhou, Shenzhen, Beijing, land resources is extremely valuable, and Sludge landfill receives restriction.Although sludge incineration can realize the most thoroughly, farthest subtract appearance, but sludge incinerator one-time investment is large, running cost is high, the pollution of dioxin and heavy metal can be caused through discharged in burning to the tail gas in environment, become the focus of tender subject that the public pays special attention to and environment social event.Sludge composting, owing to affecting the application of its composting production containing a certain amount of heavy metal in mud, especially agricultural or avoid entering in food chain and be restricted always, causes sludge composting outlet to encounter a difficulty and hard to carry on.Sludge composting foul smell is large, huge to surrounding environment influence, and compost treatment production process and quality product are difficult to control.At present, cement additive, brickmaking and this several respects technical development of artificial lightweight aggregate is used as very fast with mud, good market prospect, but also there is the shortcoming that technology is not mature enough or the amount of dissolving is too little at present in these techniques, and such as mud makes the innoxious problem that building materials do not solve mud; The dissolve ratio of mud of production of construction materials technique is limited, the mud produced continually of cannot dissolving; In addition because China is not at present still about specification or the standard of mud heavy metal restriction in building materials utilize, direct utilization can produce potential harm to human health.

Pyrolyzing sludge technique is with certain temperature lignin-sludge in nothing (lacking) oxygen atmosphere, is a kind of new sludge treatment technique.Can be used as the pyrolysis oil gas of fuel utilization owing to producing in pyrolytic process and can be used as the sludge organism charcoal of pollutant absorbent, and relative to traditional treatment process, pollutant discharge amount in pyrolysis processing process obviously reduces, and pyrolysis method can process various sewage sludge, not by the impact of mud inclusion, this is also that other method can not be compared, and therefore day by day comes into one's own.In recent years, this technology achieves breakthrough at home, obtains some Applied D emonstration in industrially scalable.

ZL200910039251.X patent discloses the method and apparatus utilizing waste oil to carry out mud comprehensive treating process, and this patent it can be used as fuel source after processing waste oil.Due under the existing national conditions of China, the centralized collection of waste oil is more difficult, because being prepared into biofuel, comparatively to serve as the added value of fuel higher by it; On the other hand, due to after simple dehydration the water ratio of mud still up to more than 80%, after directly entering destructive distillation device, pyrolysis drying stage in early stage need consume the more indirect heating energy, can running cost be increased, cause the temperature fluctuation in destructive distillation device comparatively large, simultaneously because sludge components is complicated, make pyrolysis production technique unstable and be difficult to control, also cannot ensure the quality of charcoal.

Summary of the invention

The object of the invention is for overcoming existing mud conventional processing technique not enough, solve that existing mud destructive distillation treatment technology fuel source cannot ensure, energy consumption is high, wayward, be difficult to ensure the problem such as processing efficiency and quality product, providing a kind of sludge deep treatment process and related device based on preparing charcoal, having that investment cost is low, processing efficiency is high, lasting, recycle, the advantage such as convenient management.

Contriver is found by theoretical analysis and concrete practice, and the improvement by following measures obtains a kind of sludge deep treatment process and device of efficient energy-saving, and obtains the charcoal of excellent product performance.

First preconditioning technique (as mechanical deep dehydration) can be adopted to reduce the water ratio of mud, thus reduce energy consumption and the working cost of subsequent technique.Preferably the mode of rupture of membranes deep dehydration is more first nursed one's health to reduce water ratio to mud, as first by adding chemical agent conditioning rupture of membranes.Select hypochlorite and the vitriol oil as rupture of membranes agent in the present invention, wherein the preferred clorox of hypochlorite and/or potassium hypochlorite.In mud, add rupture of membranes agent can destroy extracellular polymeric and microorganism cells, extracellular polymeric hydrolysis, microorganism cells in mud are disintegrated, and the tenuigenin of cell interior is separated out, and forms gluey mud, by making water in born of the same parents discharge, improve the efficiency of subsequent mechanical dehydration.After rupture of membranes, in mud, add inorganic coagulant, sludge modification agent and organic polymer coagulating agent again in the present invention, the surface charge of mud can be changed by the synergy of above various medicaments, promote cohesion and the sedimentation of mud granule.Inorganic coagulant in the present invention can select conventional ferric flocculant and Al-based coagulant, as FeSO 4, AlCl 3deng.Octadecyl trimethyl ammonium chloride selected by organic polymer coagulating agent in the present invention, it is good that it has chemical stability, the features such as heat-resisting, fast light, the strong acid of resistance to highly basic, it is a kind of sewage disposal organic polymer coagulating agent of excellent performance, and it can be combined by the heavy metal in mud in the process of pyrolyzing sludge, be conducive to preventing heavy metal from disengaging.In addition, also ZnCl is selected in the present invention 2as sludge modification agent.Show by experiment, ZnCl 2the surface charge of mud can be changed except having conventional coagulating agent, outside the function of raising flocculating result, can also through decomposing the internal structural characteristic changing sewage sludge solid particle in pyrolytic process.Add ZnCl 2carry out modified mud by after dehydration, drying and pyrolysis processing, the charcoal of gained has more homogeneous aperture, higher porosity and the specific surface area of Geng Gao, thus there is more excellent absorption property, there is the application potential as gac substitute.

Extracellular polymeric (ESP) can be destroyed by the composite synergy of above inorganic, organic medicament, change the surface charge of mud, promote the cohesion of mud granule, mechanical thickening after passing through again, as the effect of sheet frame mechanical expression, most interstitial water and capillary water can be removed, obtain the dehydrated sludge cake that water ratio is less than 60%.Because the organic polymer coagulating agent octadecyl trimethyl ammonium chloride used in the present invention belongs to the organic polymer backbone be very easily hydrolyzed, if first add inorganic coagulant, sludge modification agent and organic polymer coagulating agent, add rupture of membranes agent again, then the backbone of organic polymer coagulating agent can suffer the attack of rupture of membranes agent electron pair, molecule long-chain is interrupted, lose the effect of adsorption bridging, cause the mud floc sedimentation formed again to become tiny flco, reduce dewatering.Therefore inorganic coagulant, sludge modification agent and organic polymer coagulating agent is added again after fully should reacting adding rupture of membranes agent.Secondly, in the present invention, the drying of mud is separated with pyrolytic process, carries out in whizzer and pyrolyzing sludge stove respectively, to improve the thermo-efficiency of dry and pyrolytic process.In drying process, analyze known by the ftir Analysis curve (TG-FTIR) of the domestic sludge produced sewage work, there is an obvious peak value (weightless 40%) at 127.7 DEG C of places, this means that this temperature is the optimum temps that mud separates out chemical water and Bound moisture.Therefore, in the present invention, preferred drying temperature is 120-135 DEG C, recommend optimum drying temperature range to be 125-130 DEG C, both can ensure drying rate best in this process and stable drying process, the heat that biomass combustion is produced is passed to Sludge Surface, promote surperficial hygroscopic water rapid evaporation, under can avoiding excessive temperature again, heat loses in a large number, causes drying process efficiency to decline, and running cost rises.In addition, consider from process safety angle, control the danger that this temperature range also can be avoided due to the over-drying dust explosion causing Sludge Surface mummification to bring.

In addition, in pyrolyzing sludge stove, control mud in low temperature range, namely react under 300-400 DEG C of condition, make the organic matter carbonization gradually in mud.Experiment shows, the sludge organism charcoal obtained under the pyrolysis temperature condition of 300 DEG C, and it is extremely low that its heavy metal DTPA extracts state content, even do not disengage, and this rule and sludge source have nothing to do.Therefore by controlling low temperature pyrogenation temperature, not only can be energy-conservation, and the bioavailability of sludge heavy-metal can be reduced significantly, thus reduce potential environmental risk.

The pyrolytic processs of 300 DEG C are caused to the reduction of heavy metal available state, possible reason have following some: the melting of less than (1) the 300 DEG C micromolecular compound mainly in mud and volatilization, do not have the generation of chemical reaction; After 300 DEG C, unazotized polymer cellular constituent, polysaccharide and fat etc. start degraded, produce H 2, stable hydrocarbon and small-molecular-weight the material such as alcohol, ketone; (2) the nitrogen element in mud is mainly present in protein-based compound, and its pyrolytic reaction mainly concentrates on the temperature section of 300 DEG C, in thermal conversion process, in the carbon structure network that may be entered by nitrogen heterocyclic ring functional groups; (3) the organic polymer coagulating agent octadecyl trimethyl ammonium chloride owing to adding, can combine as the part of Heavy Metals in Sludge, contributes to heavy metal to be fixed in residue.

Pyrolysis processing also can affect charcoal surface charge in addition.Pyrolytic reaction is carried out, sludge modification agent ZnCl under 300-400 DEG C of condition 2fully can play modifying function, to different sources, the mud that composition is different, all can obtain the charcoal product of more uniform surface charge distribution.Experiment shows that the outside surface of charcoal may more occur oxidising process 400 DEG C time, and surface charge is more evenly distributed.

The comprehensive above result of study to pyrolysis temperature: under different pyrolysis temperature condition, the charcoal of 400 DEG C of preparations has the distribution of more uniform surface charge.In addition, the sludge organism charcoal obtained under the pyrolysis temperature condition of 300 DEG C, it is extremely low that its heavy metal DTPA extracts state content, even do not disengage, and this rule and sludge source have nothing to do.Therefore pyrolysis temperature controls between 300 DEG C-400 DEG C by the present invention.By controlling low temperature pyrogenation temperature, not only can be energy-conservation, and the bioavailability of Heavy Metals in Sludge can be reduced significantly, thus reduce potential environmental risk and the quality of charcoal can be improved.

Finally, biomass molding fuel is adopted to substitute waste oil in the present invention.Biomass molding fuel, compared with waste oil, has the following advantages: 1. wide material sources, and supplier is more, and less expensive; 2. biomass molding fuel pellet density is large, volume is little, is convenient to transport, stores and use; 3. volatile content is high, calorific value higher (greatly about about 4000-4500kcal/kg), have excellent ignition performance, 4. the use of biomass molding fuel can reduce atmospheric polluting material (discharges of sulfurous gas, oxynitride, heavy metal, Dioxins etc.) and reduce the discharge of greenhouse gases.The gloomy biomass molding fuel of enlightening (being called for short " BMF ") that the biomass molding fuel prioritizing selection Disen Heat Energy Technology Co., Ltd., Guangzhou that the present invention selects produces, also can use the other biological matter shaped fuel that market is sold in addition.

The present invention also develops a set of sludge treatment equipment for above method for sludge treatment after improving, and this device comprises sludge conditioning medicine system, mud rupture of membranes reactor, sludge dewatering equipment, sludge dryer, pyrolyzing sludge stove, biomass molding fuel heating system and flue gas purification system 7 parts; Wherein sludge conditioning medicine system comprises rupture of membranes agent basin, inorganic coagulant basin, sludge modification agent basin, organic polymer coagulating agent basin and dosing pump, it is connected with sludge conditioning reactor, adds rupture of membranes agent, inorganic coagulant, sludge modification agent and organic polymer coagulating agent by dosing pump in reactor.Sludge conditioning reactor can select sequence batch (stirred reactor, to complete mixing, reaction and precipitation process.The outlet of sludge conditioning reactor is connected with sludge dewatering equipment through force (forcing) pump pipeline, and sludge dewatering equipment can select the press apparatus such as plate-and-frame filter press or belt filter press.Water ratio through the sludge cake of sludge dewatering equipment discharge is lowered to less than 60%, then be transported in sludge dryer and carry out drying, sludge dryer can select the drying plant such as revolving drier or vertical drier, keep dry temperature between 125-130 DEG C by controlling the hot blast rate entered in sludge dryer, and makes the water ratio of mud be lowered to less than 15%.Revolving drier discharge sludge-drying can be delivered directly to pyrolysis in pyrolyzing sludge stove, also can first leave in buffer reservoir, wait be accumulated to a certain amount of after be transported to pyrolysis in pyrolyzing sludge stove.External heat type rotary furnace selected by pyrolyzing sludge stove, keep pyrolysis temperature between 300-400 DEG C by controlling the hot blast rate entered in pyrolyzing sludge stove, the inflammable gas that pyrolysis oven produces through collect after by Cemented filling to biomass formed fuel stove for the generation hot blast that burns, the solid matter obtained is charcoal.The hot blast that biomass molding fuel heating system produces divides two outlets, is connected respectively by pipeline with the gas inlet of sludge dryer with pyrolyzing sludge stove, and ingress arranges valve regulated and distributes air quantity, ensures the temperature in sludge dryer and pyrolyzing sludge stove.The flue gas produced in sludge dryer is transported to flue gas purification system, discharges after treatment.Flue gas purification system comprises spray column, sack cleaner and chimney, wherein be provided with the atomizer of ejecting liquid in spray column, spray column and and sack cleaner between flue in be provided with the dosing shower nozzle spraying charcoal powder, the flue gas of sludge dryer outlet is connected with bottom spray column, the water curtain in spray column that enters from bottom to top contacts, active carbon powder is sprayed in flue, then sack cleaner is entered, due to charcoal powder particle in flue gas, through sack cleaner owing to retaining, inertial impaction, electrostatic, the effects such as diffusion can retain charcoal powder particle and absorption pollutent thereon further, purify rear flue gas by induced draft fan through smoke stack emission.The solid particulate (i.e. charcoal powder particle) of sack cleaner interception, after impulse hunting, enters storage ash bucket, carries out processing or being directly back in mud buffer reservoir by transport pipe carrying out recycle.

In order to control anaerobic or the anoxic condition of pyrolytic process, in the present invention, the feed system of pyrolyzing sludge stove adopts rotary feeding valve, fill process ensures that air-tight state prevents inclusion of air, gaseous tension in pyrolytic process in pyrolysis oven adopts and automatically controls, keep pressurized operation, make the normal atmosphere of air pressure slightly larger than outside of pyrolysis oven inside, be preferably greater than outside normal atmosphere 40-60Pa, thus avoid air to enter pyrolysis oven causing oxygen too high and the danger of blasting.

In sum, the object of the present invention is to provide a kind of sludge deep process and resource utilization method, comprise the following steps:

1) rupture of membranes dehydrating step: add rupture of membranes agent in mud, adds inorganic coagulant, sludge modification agent and organic polymer coagulating agent again after conditioning rupture of membranes, and the mode finally by mechanical expression dehydration makes moisture percentage in sewage sludge reach less than 60%;

2) drying step: mud rupture of membranes dehydrating step obtained carries out drying at the temperature of 125-130 DEG C, wherein will evaporate further by moisture content, and make its water ratio be reduced to less than 15%;

3) pyrolysis step: dried mud carries out pyrolysis at the temperature of 300-400 DEG C, the organic major part in mud is made to be cracked into inflammable gas, small part is tar, and remaining solid material finally obtains the charcoal product of good adsorption performance under the effect of sludge modification agent.

The agent of rupture of membranes described in the present invention is hypochlorite and the vitriol oil.

Hypochlorite described in the present invention is that hypochlorous acid is received, and consumption is the 0.2-0.5%(w/w of sludge quantity), the consumption of the vitriol oil is 10-25ml/L (v/v).

Coagulating agent described in the present invention is FeSO 4, consumption is the 0.5-1.5%(w/w of sludge quantity).

The agent of sludge modification described in the present invention is ZnCl 2, consumption is the 1.0-2.0%(w/w of sludge quantity).

The coagulating agent of organic polymer described in the present invention is octadecyl trimethyl ammonium chloride, and consumption is the 0.3-0.5%(w/w of sludge quantity).

Method for sludge treatment described in the present invention, is characterized in that: all adopt biomass molding fuel heat supply in drying step and pyrolysis step.

The present invention also aims to a kind of sludge treatment equipment, this device includes sludge conditioning medicine system, mud rupture of membranes reactor, sludge dewatering equipment, sludge dryer, pyrolyzing sludge stove, biomass molding fuel heating system and flue gas purification system 7 parts, wherein sludge conditioning medicine system is connected with sludge conditioning reactor, in reactor, rupture of membranes agent is added by dosing pump, inorganic coagulant, sludge modification agent and organic polymer coagulating agent, the outlet of sludge conditioning reactor is connected with the entrance of sludge dewatering equipment through force (forcing) pump pipeline, the sludge cake that water ratio drops to less than 60% after dehydration is transported to and sludge dryer import, at the temperature of 125-130 DEG C, carry out drying makes water ratio drop to less than 15%, the sludge-drying that sludge dryer is discharged is transported to pyrolyzing sludge stove again, pyrolysis is carried out at the temperature of 300-400 DEG C, the hot blast that biomass molding fuel heating system produces divides two outlets, is connected respectively by pipeline with the gas inlet of sludge dryer with pyrolyzing sludge stove, and ingress arranges valve regulated and distributes air quantity, ensures the temperature in sludge dryer and pyrolyzing sludge stove, the inflammable gas that pyrolysis oven produces through collect after by Cemented filling to biomass formed fuel stove for the generation hot blast that burns, the flue gas produced in sludge dryer is transported to flue gas purification system, discharges after treatment.

Sludge dryer described in the present invention and be also provided with buffer reservoir between pyrolyzing sludge stove, described sludge dewatering equipment is high pressure or normal pressure plate-and-frame filter press, and sludge dryer is revolving drier, and pyrolyzing sludge stove is external heat type rotary furnace.

The entrance of the stove of pyrolyzing sludge described in the present invention installs rotary feeding valve, make reinforced and sealing alternate run, pyrolytic process carries out under the anaerobic or anoxic condition of sealing, gaseous tension in pyrolysis oven adopts automatic monitoring, the inflammable gas produced by pump drainage pyrolysis keeps pressurized operation, makes the air pressure of pyrolysis oven inside be greater than outside normal atmosphere 40-60Pa.

Flue gas purification system described in the present invention comprises spray column, sack cleaner and chimney, wherein be provided with the atomizer of ejecting liquid in spray column, the shower nozzle spraying charcoal powder is provided with in flue between spray column and sack cleaner, sack cleaner is provided with a transport pipe and sludge dewatering equipment, and the charcoal powder of interception is back to mud buffer reservoir.

In sum, the present invention is by adjustment and Optimization Technology combination, increase suitable preconditioning technique (conditioning rupture of membranes is in conjunction with mechanical dehydration), suitable drying and pyrolysis temperature is selected to reduce the method for processing cost, find the secure biomass moulding in inexpensive source or the non-forming fuel energy as an alternative simultaneously, achieve raising processing efficiency, improving product performance, reduce energy consumption, reduce the advantages such as secondary pollution, achieve the thorough harmless treatment of excess sludge, meet the environmental friendly principle of current energy-saving and emission-reduction and the utilization of resources, in treating processes, pollutent generation is low, there is good sustainability.

Accompanying drawing explanation

Above-mentioned and/or additional aspect of the present invention and advantage will become obvious and easy understand from accompanying drawing below combining to the description of embodiment, wherein:

Fig. 1 is the structural representation of sludge treatment equipment of the present invention.

Wherein, 1 is sludge conditioning medicine system; 2 is sludge conditioning reaction tank; 3 is plate-and-frame filter press; 4 is endless belt conveyor; 5 is whizzer; 6 is buffer reservoir; 7 is spray column; 8 is sack cleaner; 9 is induced draft fan; 10 is chimney; 11 is biomass fuel lift; 12 is combustion chamber; 13 volume dampers; 14 is overfire air fan; 15 is biomass hotblast stove; 16 is pyrolyzing sludge stove; 17 is sludge organism charcoal.

Fig. 2 is the thermogravimetric-differential thermogravimetric curve (TG-DTG) of the domestic sludge of process of the present invention.

Embodiment

Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Be exemplary below by the embodiment be described with reference to the drawings, be intended to for explaining the present invention, and can not limitation of the present invention be interpreted as.

Method for sludge treatment of the present invention and device are described with reference to the accompanying drawings as follows:

The structure of sludge treatment equipment of the present invention as shown in Figure 1.It comprises in subtend mud adds rupture of membranes agent, organic coagulants, the sludge conditioning medicine system 1 of sludge modification agent and organic polymer coagulating agent, the sludge conditioning reaction tank 2 carrying out mixing, react for mud and medicament, plate-and-frame filter press 3 to deeply dehydrating sludge.Water ratio is that first the pending mud of 80-99% enter into sludge conditioning reaction tank 2, then in mud, the rupture of membranes agent be made up of clorox and the vitriol oil is added by sludge conditioning medicine system 1, after rupture of membranes has reacted, add inorganic coagulant and sludge modification agent more wherein, after abundant hybrid reaction, finally add organic polymer coagulating agent.Complete the mud after conditioning to be pumped in plate-and-frame filter press 3 and to carry out mechanical expression dehydration, the water ratio that press filtration obtains is delivered in whizzer 5 lower than the sludge cake of 60% by endless belt conveyor 4, sludge cake carries out drying in whizzer 5 at the temperature of 125-130 DEG C, until its water ratio lower than 15% time, sludge-drying is proceeded in buffer reservoir 6 and temporarily store, to be achieved a certain amount of time, sludge-drying is delivered in pyrolyzing sludge stove 16 and carries out pyrolysis.The flue gas that mud produces time dry in whizzer 5 is transported to the bottom of spray column 7, contact with spray liquid from bottom to top, enter between sack cleaner 8 after the discharge of spray column top and spray into charcoal powder wherein by shower nozzle flue, retain charcoal powder particle through sack cleaner to be collected, after purification, flue gas is discharged through chimney 10 by induced draft fan 9.Sludge-drying is carrying out pyrolysis without (lacking) oxygen, stove internal gas pressure under being greater than the outside temperature condition of normal atmosphere 40-60Pa and 300-400 DEG C in pyrolyzing sludge stove 16, make the organic matter carbonization gradually in mud, cracking simultaneously produces inflammable gas (comprising methane, propane, coal gas etc.), and the solid matter obtained after pyrolysis completes is sludge organism charcoal.The biomass molding fuel bought enters into the combustion chamber 12 of biomass thermal wind furnace 15 by biomass fuel lift 11, mixed firing is carried out with the air blasted by blower fan 14, the hot blast produced is divided into two strands by volume damper 13, be connected with the gas inlet of whizzer 5 with pyrolyzing sludge stove 16 respectively by pipeline, to ensure the temperature in sludge dryer and pyrolyzing sludge stove.The inflammable gas produced in pyrolyzing sludge stove 16 is also sucked to be transported in combustion chamber 12 and burns, and reclaims its energy to realize recycle.

Embodiment 1

When mud being processed by above device, first in sludge conditioning reaction tank, add the domestic sludge that 2000L water ratio is 96%, then add hypochlorous acid and receive 6kg, vitriol oil 30L, after stirring 60min, add FeSO again 420kg, ZnCl 230kg stirs 3min, after finally adding organic polymer coagulating agent octadecyl trimethyl ammonium chloride 8kg stirring 3min, barrier film plate-and-frame filter press is adopted to enter mud 120min under the pressure of 0.8MPa, again with the pressure lower diaphragm plate squeezing 20min of hydraulic pressure at 0.8MPa, mud cake is weighed, measure moisture percentage in sewage sludge is 59%.

Embodiment 2

When mud being processed by above device, first in sludge conditioning reaction tank, add the domestic sludge that 2000L water ratio is 96%, then add hypochlorous acid and receive 10kg, vitriol oil 40L, after stirring 80min, add FeSO again 420kg, ZnCl 230kg stirs 4min, after finally adding organic polymer coagulating agent octadecyl trimethyl ammonium chloride 8kg stirring 4min, barrier film plate-and-frame filter press is adopted to enter mud 120min under the pressure of 0.8MPa, again with the pressure lower diaphragm plate squeezing 20min of hydraulic pressure at 0.8MPa, mud cake is weighed, measure moisture percentage in sewage sludge is 56%.Embodiment 3

When mud being processed by above device, first in sludge conditioning reaction tank, add the domestic sludge that 2000L water ratio is 96%, then add hypochlorous acid and receive 6kg, vitriol oil 30L, after stirring 60min, add FeSO again 430kg, ZnCl 240kg stirs 4min, after finally adding organic polymer coagulating agent octadecyl trimethyl ammonium chloride 8kg stirring 4min, barrier film plate-and-frame filter press is adopted to enter mud 120min under the pressure of 0.8MPa, again with the pressure lower diaphragm plate squeezing 20min of hydraulic pressure at 0.8MPa, mud cake is weighed, measure moisture percentage in sewage sludge is 58%.

Embodiment 4

When mud being processed by above device, first in sludge conditioning reaction tank, add the domestic sludge that 2000L water ratio is 96%, then add hypochlorous acid and receive 6kg, vitriol oil 30L, after stirring 80min, add FeSO again 420kg, ZnCl 230kg stirs 5min, after finally adding organic polymer coagulating agent octadecyl trimethyl ammonium chloride 10kg stirring 5min, barrier film plate-and-frame filter press is adopted to enter mud 120min under the pressure of 0.8MPa, again with the pressure lower diaphragm plate squeezing 20min of hydraulic pressure at 0.8MPa, mud cake is weighed, measure moisture percentage in sewage sludge is 57%.

Comparative example 1

When mud being processed by above device, first in sludge conditioning reaction tank, add the domestic sludge that 2000L water ratio is 96%, then add FeSO 420kg, ZnCl 230kg stirs 3min, after finally adding organic polymer coagulating agent octadecyl trimethyl ammonium chloride 8kg stirring 3min, barrier film plate-and-frame filter press is adopted to enter mud 120min under the pressure of 0.8MPa, again with the pressure lower diaphragm plate squeezing 20min of hydraulic pressure at 0.8MPa, mud cake is weighed, measure moisture percentage in sewage sludge is 64%.

Comparative example 2

When mud being processed by above device, first in sludge conditioning reaction tank, add the domestic sludge that 2000L water ratio is 96%, then add FeSO 450kg stirs 4min, after finally adding organic polymer coagulating agent octadecyl trimethyl ammonium chloride 8kg stirring 4min, barrier film plate-and-frame filter press is adopted to enter mud 120min under the pressure of 0.8MPa, again with the pressure lower diaphragm plate squeezing 20min of hydraulic pressure at 0.8MPa, mud cake is weighed, measure moisture percentage in sewage sludge is 66%.Comparative example 3

When mud being processed by above device, first in sludge conditioning reaction tank, add the domestic sludge that 2000L water ratio is 96%, then add hypochlorous acid and receive 6kg, vitriol oil 30L, after stirring 60min, add FeSO again 450kg stirs 4min, after finally adding organic polymer coagulating agent octadecyl trimethyl ammonium chloride 8kg stirring 4min, barrier film plate-and-frame filter press is adopted to enter mud 120min under the pressure of 0.8MPa, again with the pressure lower diaphragm plate squeezing 20min of hydraulic pressure at 0.8MPa, mud cake is weighed, measure moisture percentage in sewage sludge is 59.8%.

Research finds, moisture percentage in sewage sludge declines along with the increase of rupture of membranes agent, inorganic coagulant and organic polymer coagulant administration amount; And after adding properties-correcting agent, also promote sludge dewatering effect.Within the scope of the dosage investigated, moisture percentage in sewage sludge is minimum reaches 56%, and be better than 66.0% moisture percentage in sewage sludge when only adopting inorganic coagulant and organic polymer coagulant double crossing to nurse one's health, reduced training is obvious.

Get after the dewatered sludge (namely add properties-correcting agent and do not add properties-correcting agent two kinds of situations) obtained in above-described embodiment 1 and comparative example 3 carries out drying at 125 DEG C, water ratio is made to be reduced to 10%, then pyrolysis is carried out, under 400 DEG C of conditions, charing 4h, mills the powder after charing and obtains sludge organism charcoal sorbing material.The difference of its primary attachment performance is as follows:

As can be seen from the table, by adding properties-correcting agent ZnCl in mud 2, the porosity of charcoal, specific surface area and adsorptive power can be improved significantly, thus obtain a kind of high-quality sludge organism charcoal that can substitute gac.

By the method in above-described embodiment 1, conditioning rupture of membranes and processed are carried out to the mud from three Sewage Plant sources, then after carrying out drying at the temperature of 130 DEG C, water ratio is made to be reduced to 15%, then pyrolysis is carried out, under selected temperature condition, charing 4h, the heavy metal then detecting the biological carbon materials obtained disengages concentration.Experimental result sees the following form:

DTPA bound residue (mgkg -1)

DTPA bound residue/full dose

Wherein A, B, C representative is from the mud of three different sewage factories.Numeral pyrolysis temperature after letter, wherein " 25 " represent the non-pyrolysis of normal temperature, i.e. primary mud.

A. EU Council's instruction 86/278/EEC(1986 promulgated June 12), mainly for environment protection, soil protection when particularly mud is used for agricultural

B. " agricultural sludge pollutant catabolic gene standard " (GB4284-84).

As can be seen from upper table data, for the mud of different sources, pyrolysis temperature is 300 DEG C is effectively to reduce DTPA bound residue concentration, fails to be detected so that the DTPA of each heavy metal species extracts state.

By the method in above-described embodiment 1, conditioning rupture of membranes and processed are carried out to the mud from three Sewage Plant sources, then after carrying out drying at the temperature of 130 DEG C, water ratio is made to be reduced to 15%, then pyrolysis is carried out, under selected temperature condition, charing 4h, then detects the surface charge of the biological carbon materials obtained.Experimental result sees the following form:

The surface charge of table different sources sludge organism charcoal under different pyrolysis temperature

* letter abbreviations represents Sewage Plant title, the numeral pyrolysis temperature after letter

And pH pZCwith pH iEPthe change of difference show, pyrolysis processing is affecting charcoal surface charge in varying degrees.The pH of all three kinds of sludge source pZCwith pH iEPdifference 400 DEG C time, obtain Schwellenwert, this shows, when this temperature, the outside surface of charcoal may more occur oxidising process, and surface charge is more evenly distributed.

Comprehensive above result of study: under different pyrolysis temperature condition, the charcoal of 400 DEG C of preparations has the distribution of more uniform surface charge.In addition, the sludge organism charcoal obtained under the pyrolysis temperature condition of 300 DEG C, it is extremely low that its heavy metal DTPA extracts state content, even do not disengage, and this rule and sludge source have nothing to do.

This shows, by controlling low temperature pyrogenation temperature, not only can be energy-conservation, and the bioavailability of sludge heavy-metal can be reduced significantly, thus reduce potential environmental risk.

In the description of this specification sheets, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present invention or example.In this manual, identical embodiment or example are not necessarily referred to the schematic representation of above-mentioned term.And the specific features of description, structure, material or feature can combine in an appropriate manner in any one or more embodiment or example.

Although illustrate and describe embodiments of the invention above, be understandable that, above-described embodiment is exemplary, can not be interpreted as limitation of the present invention, those of ordinary skill in the art can change above-described embodiment within the scope of the invention when not departing from principle of the present invention and aim, revising, replacing and modification.

Claims (4)

1. sludge deep process and a resource utilization method, comprises the following steps:
1) rupture of membranes dehydrating step: add rupture of membranes agent in mud, adds inorganic coagulant, sludge modification agent and organic polymer coagulating agent again after conditioning rupture of membranes, and the mode finally by mechanical expression dehydration makes moisture percentage in sewage sludge reach less than 60%;
2) drying step: mud rupture of membranes dehydrating step obtained carries out drying at the temperature of 125-130 DEG C, wherein will evaporate further by moisture content, and make its water ratio be reduced to less than 15%;
3) pyrolysis step: dried mud carries out pyrolysis at the temperature of 300-400 DEG C, the organic major part in mud is made to be cracked into inflammable gas, small part is tar, and remaining solid material obtains the good charcoal product of absorption property under sludge modification agent effect
Wherein,
Described sludge modification agent is ZnCl 2, consumption is the 1.0-2.0% (w/w) of sludge quantity;
Described organic polymer coagulating agent is octadecyl trimethyl ammonium chloride, and consumption is the 0.3-0.5% (w/w) of sludge quantity.
2. sludge deep process as claimed in claim 1 and resource utilization method, it is characterized in that, described rupture of membranes agent is hypochlorite and the vitriol oil.
3. sludge deep process as claimed in claim 2 and resource utilization method, it is characterized in that, described hypochlorite is clorox, and consumption is the 0.2-0.5% (w/w) of sludge quantity, and the consumption of the vitriol oil is 10-25ml/L (v/v).
4. sludge deep process as claimed in claim 1 and resource utilization method, is characterized in that, all adopt biomass molding fuel heat supply in drying step and pyrolysis step.
CN201310327013.5A 2013-07-30 2013-07-30 Method and apparatus for sludge deep treatment and resource utilization CN103359898B (en)

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CN104386893B (en) * 2014-12-05 2016-06-01 许国胜 The treatment process of a kind of mud and device thereof
CN104593112B (en) * 2015-01-30 2017-03-22 湖南大学 Preparation method and preparation system for biomass forming granular fuels
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