CN105000763A - Overall treatment method for sludge - Google Patents

Overall treatment method for sludge Download PDF

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Publication number
CN105000763A
CN105000763A CN201510346591.2A CN201510346591A CN105000763A CN 105000763 A CN105000763 A CN 105000763A CN 201510346591 A CN201510346591 A CN 201510346591A CN 105000763 A CN105000763 A CN 105000763A
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Prior art keywords
aeration
treatment
catalyzing
sludge
sewage
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CN201510346591.2A
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张萍
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Individual
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Priority to CN201510346591.2A priority Critical patent/CN105000763A/en
Publication of CN105000763A publication Critical patent/CN105000763A/en
Priority to PCT/CN2016/077052 priority patent/WO2016206417A1/en
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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
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
    • C04B38/02—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by adding chemical blowing agents

Abstract

The invention discloses an overall treatment method for sludge. The method includes the steps of multi-stage sedimentation, biochemical treatment, aeration catalyzation and sludge recycling treatment. According to the treatment method, a photocatalyst with high selectivity for urban domestic sewage is adopted in the step of aeration catalyzation, so that photocatalytic degradation efficiency is high; in addition, the sludge is modified and made into haycite, so that the recycling utilization rate of the domestic sewage is increased, and the additional value of sludge products is improved.

Description

Method for comprehensive treatment of sludge
Technical field
The present invention relates to Method for comprehensive treatment of sludge, particularly relate to the integrated conduct method of the mud from sanitary sewage.
Background technology
Mud is the main component of the sewage that living garbage pollution produces.Sewage is that kitchen, toilet or bathroom normally use produced sanitary sewage from the living facilities such as resident family, restaurant, hotel, office, school, factory.Main containing silt, grease, soap lye, fruit stone, paper scrap and things bits, germ, foreign material and excrement etc. in sanitary sewage.According to the chemical property of material, these sewage compositions mainly can be divided into organism and inorganics two class, and usual organic ratio is relatively large, and probably about 60 percent, all the other are inorganics.Classify according to physical properties, colloidalmaterial, soluble substance and insoluble substance can be divided into.For the waste water that industry is discharged, water quality is generally more stable, and when using biology/chemical process, treatment effect is more remarkable.
CN104649503A discloses one way of life Sewage treatment systems, it is characterized in that: comprise grid, equalizing tank, anoxic pond, Aerobic Pond, settling tank, sterilization pool, the input terminus of grid is connected with the input terminus of equalizing tank, the output terminal of equalizing tank is connected with the input terminus of anoxic pond, the input terminus of the output terminal of anoxic pond also Aerobic Pond connects, the output terminal of Aerobic Pond is connected with the input terminus of settling tank, and the output terminal of settling tank is connected with the input terminus of sterilization pool.
CN104261635A discloses the environmental purification method of one way of life sewage, it is characterized in that, step comprises: be temporarily stored in water collecting basin by sanitary sewage, coarse rack is utilized to salvage bulky dregs, then, after utilizing the height of sump pump lifting sewage, recycling fine fack salvages the little dregs of volume; Sewage in water collecting basin is entered in oil trap, and removes the grease in sewage with By Bubble-floating Method; Sewage after deoiling is entered in settling pit, isolates the inorganic particle in sewage; Sewage in settling pit is drained in equalizing tank, homogenizing water quality; Enter anoxic pond by sewage pump, utilize the degradation capability of anoxic microorganism that organic polymer pollutent in sewage is resolved into organic low molecular pollutent; Sewage in anoxic pond is entered biochemistry pool, utilizes biomembrance process to process sewage; Barrier film is laid in the inhalant region of artificial swamp, treatment zone, exhalant region.
CN103508576A discloses a kind for the treatment of method of city domestic sewage, when building new town, the drainage pipeline of city domestic water and the drainage pipeline of water of productive use are arranged respectively, simultaneously, agricultural development is carried out at surrounding city, city domestic sewage is introduced farmland or the network of rivers through process, instead of be directly discharged in rivers and go, as the fertilizer of Planting Crops, by the sanitary sewage in city by independently pipeline centralized collection at sanitary sewage disposal station, set up multiple precipitation (excrement pond) pond and treating pond on the outskirts of a town, utilize pipeline, city domestic sewage is transported to these settling tanks and treating pond from sanitary sewage disposal station, water after multi stage precipitation and purification, otherwise processed, the ight soil etc. of precipitation gained, can as fertilizer for agricultural planting.
CN103265152A discloses one way of life sewage water treatment method, belong to sewage treatment area, its technical process is Domestic sewage collecting-grid coarse filtration-sludge settling and sand water separation-oil removal precipitation-biological treatment-finly filtration-backwash, it is characterized in that described grid coarse filtration, comprise coarse rack to filter and fine fack filtration, the interval of grid strip of coarse rack is 20mm; The interval of grid strip of fine fack is 5mm.
CN102020396A discloses one way of life sewage water treatment method, and the method is that sanitary sewage is first carried out solid-liquid separation, then carries out two-section type biochemical treatment, the clear water cyclically utilizing obtained after process to the sewage after separation.
CN101108752A discloses one way of life sewage water treatment method, it is after fully being mixed containing alkali waste water with alumina producer by sanitary sewage, enter alumina producer Sewage treatment systems and carry out conventional processing, it is characterized in that: by volume per-cent, sanitary sewage 10-50%, alumina producer is containing alkali waste water 50-90%.
CN104291520A discloses one way of life sewage disposal and reuse method, it is characterized in that: sanitary sewage is carried out classified emission, the Heisui River of high density and the buck of lower concentration is divided into from the different of source according to sewage character, Heisui River row is from rear, pass through anaerobic treatment pool successively, aeration contact-oxidation pool, aeration high resistant ecological pool, aeration low resistant ecological pool and ecological precipitation process pond, equalizing tank is entered after Heisui River after process and buck merge, the process of subsurface infiltration device is sent into after equalizing tank regulates, the water of this subsurface infiltration device process is back to after sterilization flushes the toilet or qualified discharge.
CN103113007A discloses one way of life sewage treatment process, take biomembrance process as core, the first step adopts flap anaerobic fixed film reactor, the second stage adopts BAF, wherein said flap anaerobic fixed film reactor inside is provided with flap, and this flap anaerobic fixed film reactor under anaerobic can absorb phosphorus.
CN103058312A discloses the treatment process of one way of life sewage, belongs to field of environment protection.The present invention always adds Calucium Silicate powder in the sanitary sewage of biochemical treatment process, and add-on is 0.1-1.0g/100mL sanitary sewage, and regulates pH to be 2-12, Calucium Silicate powder is uniformly dispersed in water, and maintains 15-90 minute; Water after collecting by filtration process.
US2013213796A1 discloses a kind of sewage water treatment method, wherein relate to the method for the structure of the organic sludge for modification dehydration to be subjected and/or drying, it comprises the step that described organic sludge is exposed to the effect of electric field wherein, wherein said electric field is generated by direct current, described organic sludge is wet solid form, have according to weighing scale higher than mud gross weight 10% dry matter content.
" China's municipal sewage treatment problems faced and solve scheme ", environment protection and recycling economy, 04 phase in 2011, review China's municipal sewage treatment development problems faced, pointing out that sewage disposal technology falls behind urban sewage treatment technology is that can municipal sewage treatment facility the key of high-efficient operation, for a long time, the sewage disposal technology of China is all followed American-European countries's route in the last hundred years and treatment technology, in absorption, the technology of oneself is also form while digestion foreign technology, urban sewage treatment technology has a great development, but it is still also very backward compared with the state of the art that the sewage disposal technology that China's present stage adopts is external with the same period, all the time there is efficiency low, energy consumption is high, maintenance rate is high, the shortcomings such as level of automation is low.
In the prior art comprising above-mentioned document, mud is usual stacked discarded, and do not obtain comparatively good utilisation, the catalyzer used in aeration and catalyzing process in addition lacks specific aim to urban biology sewage, causes aeration and catalyzing efficiency not high.
Summary of the invention
For solving the problem, the present inventor, through further investigation and great many of experiments, proposes following technical scheme.
On the one hand, provide one way of life sewage water treatment method, it is characterized in that: the method comprises the following steps: (1) multi stage precipitation; (2) biochemical treatment; (3) aeration and catalyzing; (4) recycling sludge process,
Described recycling sludge process comprises: the active sludge produced in multi stage precipitation, biochemical treatment, aeration and catalyzing treating processes collects by (a); (b) by sludge air drying to moisture content lower than 15 % by weight, then in mud, add flyash and quartz sand, the amount of flyash and quartz sand is respectively 1-5 % by weight and 1-3 % by weight based on the weighing scale of described mud, stirs 5-20 hour; C () then adds the Vltra tears of polyacrylamide based on the weighing scale 0.01-0.08 % by weight of described mud and 0.02-0.08 % by weight wherein, stir 1-8 hour; (d) by the material of step (2) at ambient conditions air-dry to water-content lower than 8 % by weight, being then crushed to particle diameter is below 5mm; E mud after fragmentation is manufactured haydite by ().
From the mud of sanitary sewage owing to being under water for a long time, loosely organized, void ratio is very large, its water ratio is very high, reaches 120%-180%, much larger than the liquid limit of mud, in addition mud natural structure intensity is very low, mould and flow state so mud is often in stream, if therefore will be used in urban road laying, tackle it and carry out modification.Mud is after method process of the present invention, water ratio significantly reduces, void ratio reduces, saturation ratio is corresponding reduction also, liquidity index and compression factor significantly reduce, mud soil is made to be plastic or hardened condition by stream flow, compressibility reduces greatly, cohesion strengthens, internal friction angle increases, thus its slip resistance is improved, and spread pattern between soil body particle is changed, sludge structure is recombinated, it is high that the soil body after solidification has intensity, the characteristic that compressibility is low, meet the functional requirement as roadbed material, soil strength such as can be made to improve about 22%.
Described haydite manufacture method can comprise the steps:
(1) building waste pulverized particles particle diameter being less than 5mm to transfer in process furnace dry 30-60 minute at the temperature of 200-300 DEG C, is transferred in ball mill, ball-milling processing 10-60 minute, drum's speed of rotation 200-300 rev/min by dried raw material;
(2) in ball mill, add the pore-forming material of 2-4 % by weight, continue ball milling and be dry mixed 5-10 minute, be then transferred in dosing chamber by mixing raw material, the suitable quantity of water that adds water stirs, granulation, and particle diameter, within the scope of 5-9mm, then dries naturally;
(3) saccharoid after drying is transferred in process furnace, at the temperature of 300 DEG C-500 DEG C, is incubated 20-60 minute, naturally cools to room temperature, obtain haydite finished product.
Described granulation step can use forming machine to carry out, and also can carry out with ramming comminution granulation.
Described pore-forming material preferably has chemical formula RCNHCH 2the amide substance of OH.
The manufacture of described haydite can make sludge product have higher added value, such as, calculate with existing market market, manufactures haydite (i.e. high strength light body haydite), the added value of mud can be made to increase 20-30% further by modified sewage sludge.
Preferably, described multi stage precipitation step comprises one-level advection sedimentation, secondary advection sedimentation, flocculation reaction and flocculation sediment, and the effluent stream of described advection sedimentation is to vertical with contaminant particle sedimentation direction.
One-level advection sedimentation can carry out in one-level horizontal sedimentation tank, and secondary advection sedimentation can carry out in secondary horizontal sedimentation tank, and flocculation reaction can be carried out in flocculation tank, and flocculation sediment can carry out in flocculation sedimentation tank.
Preferably, in described biochemical treatment step, aerobic treatment and anaerobic treatment is comprised; Wherein aerobic treatment mainly carries out nitrification and organic removal, and the bottom in aerobic treatment district is provided with aeration sandpipe to play stirring action while aeration aerating, can be provided with triphase separator on top, aerobic zone; Denitrification and sewage sludge storage are mainly carried out in anaerobic zone.
Preferably, in biochemical treatment step, the sewage through precipitation process flows uniformly across the preset aerobic filtrate with aerobic bacterial classification and the anaerobism filtrate with anaerobic species.In described treating processes, the suspension micropollutants in sewage can be processed, and bacterial classification adsorbs, filtrate interception, and organic pollutant is by anoxic, anaerobic biochemical treatment, and biogas, again through gas-water separation, is discharged and utilized by the sewage of biochemical treatment.
In aeration and catalyzing step, bubbling can be carried out to the water body adding catalyzer, carry out aeration and catalyzing process, the ammonia in sewage, nitrogen are separated out.Described aeration can carry out under natural light.The consumption of catalyzer can be 0.01-0.2g/L (sewage), is preferably 0.05-0.1g/L (sewage).
In a preferred embodiment of the present invention, in aeration and catalyzing step, use based on TiO 2photocatalyst carry out aeration and catalyzing.
Described based on TiO 2photocatalyst be preferably pucherite and Fe 3+the TiO of codoped 2catalyzer, it can be labeled as BiVO 4-Fe 3+/ TiO 2.Based on the total weight of described catalyzer, BiVO 4content can be 5-15% weight, Fe 3+content can be 1-5% weight.
Described catalyzer can obtain by the following method: the butyl (tetra) titanate of 10-20mL under agitation slowly adds in 20-60mL dehydrated alcohol by (1), then adds 5-10mL glacial acetic acid, takes a certain amount of BiVO by regulation doping ratio simultaneously 4and Fe 2(SO 4) 3be added in 20-60mL dehydrated alcohol respectively, then by the mixing of two kinds of solution, after continuing to be stirred to gel state, put it into thermostatic drying chamber, with after the dry 5-10h of the thermostatic of 60-100 DEG C by sample grind into powder; (2) by BiVO 4, Fe 3+the TiO of codoped 2dry gel powder adds distilled water and carries out suction filtration repeatedly after making it dispersed with sonic oscillation, the Fe of unbound state in removing sample 3+after carried out freeze-day with constant temperature again; (3) dried product is put into after retort furnace heat-treats 1-5h with the temperature of 300-500 DEG C and pass through grinding again, obtained BiVO 4-Fe 3+/ TiO 2catalyzer.
Particularly preferably, described TiO 2for titania nanotube.The pore footpath of titania nanotube is preferably 50-70nm, and BET specific surface area is preferably 5-7m 2/ g.Research finds, such aperture and the titania nanotube of specific surface area, the organism in easier adsorbent solution, because light-catalyzed reaction is carried out at catalyst surface, and therefore described TiO 2more light radiation can be obtained in the photocatalytic process of nanotube, higher photo-quantum efficiency, make photocatalytic activity will higher than TiO 2powder or film.Described titania nanotube obtains by template or anonizing.
In a preferred embodiment, described catalyzer also includes phosphorus (P), and P element content is the 0.1-1% weight of total catalyst weight.Research finds, P doping can improve TiO 2the specific surface area of nanotube, reduces its grain-size, suppresses Detitanium-ore-type TiO 2transform to Rutile Type, and there is absorption tail in visible region, thus effectively improve TiO 2visible light catalytic performance.In a preferred embodiment, the precursor of P is NaH 2pO 4, find that obtaining P doping by this precursor can more enough make P be embedded in titania nanotube better.
Preferably, in aeration and catalyzing step, the water that will process through step (2) after diatomite filtration process, then carries out aeration and catalyzing.
Described recycling sludge treatment step can also comprise mud is carried out anaerobically fermenting process.
In aeration and catalyzing, carry out bubbling, carry out aeration and catalyzing process to the water body adding catalyzer, this process can make ammonia in sewage, nitrogen separate out, then removes floating foreign material through floating assorted collection, and making sewage obtain deep purifying becomes clear water.Then, then by the clear water after purification, filter filter through hydrophilic complex sand, reduce water molecules surface tension, the clear water after further purifying treatment stores water reservoir, in order to reuse.
In recycling sludge process, the active sludge produced is collected, such as, be pooled to settling region by mud gravity channel in precipitation, biochemical treatment, aeration and catalyzing treating processes.
Embodiment
Now with comparative example, technical scheme of the present invention is described further below in conjunction with the embodiments.
Embodiment 1
Take the experimental program of photocatalytic degradation rhodamine B, simulate and investigate sanitary sewage aeration and catalyzing ability of the present invention.By the BiVO prepared according to method mentioned above 4-Fe 3+/ TiO 2(BiVO 4content is 10% weight, Fe 3+content is 2% weight) photocatalyst 40mg is placed in beaker, the 200mL rhodamine B solution (30mg/L) prepared is added in beaker, by ultrasonic disperse, catalyst powder is completely all hooked and be dispersed in (concentration is 0.01g/L) in rhodamine B solution, then 30 DEG C of constant temperature are kept by constant temperature jacket, in the dark stir to reach adsorption equilibrium, then get a certain amount of sample in 10mL centrifuge tube.Constant temperature jacket adds spectral filter (>=420nm), and magnetic agitation irradiates 4h under being placed in 500W xenon lamp, by the centrifugal of institute's sample thief in centrifuge tube, gets supernatant liquid, utilizes its absorbancy when wavelength of UV, visible light spectrophotometric determination.Rhodamine B concentration in the solution and its absorbancy linear, so can according to the numerical value of surveyed absorbancy, calculate its concentration, and calculate the rhodamine B degradation rate of catalyzer on this basis, assessed the photocatalytic activity of catalyzer by its degradation rate.After measured, the rhodamine B degradation rate when 4h is about 81%.
Embodiment 2
The mud of embodiment 1 is handled as follows: (a) by sludge air drying to moisture content lower than 15 % by weight, then in mud, flyash and quartz sand is added, the amount of flyash and quartz sand is respectively 3 % by weight and 3 % by weight based on the weighing scale of described mud, stirs 6 hours; B () then adds the polyacrylamide of weighing scale 0.05 % by weight based on described mud and the Vltra tears of 0.05 % by weight wherein, stir 4 hours; (c) by the material of step (2) at ambient conditions air-dry to water-content lower than 8 % by weight, being then crushed to particle diameter is 12mm.Described mud, by this process, can substitute filling of using in higher level highway subgrade and use native requirement.This can be that whole cost of sewage disposal reduces about 12%.
Comparative example 1
Take the operation steps identical with embodiment 1, be only that catalyzer is Fe with the difference of embodiment 1 3+/ TiO 2(Fe 3+content is 2% weight), namely conventional transient metal doped titanium deoxide catalyst.After measured, the rhodamine B degradation rate when 4h is about 45%.
Comparative example 2
Take the operation steps identical with embodiment 1, be only that support of the catalyst is conventional Rutile Type TiO with the difference of embodiment 1 2powder (Alfa Aesar company can be derived from).After measured, the rhodamine B degradation rate when 4h is about 67%.
Clearly can be found out by the contrast of the above results, catalyzer of the present invention has best catalytic effect.Such effect is that those skilled in the art can not expect.By studying discovery further, its reason is, BiVO 4conduction band compare TiO 2conduction band low, therefore the former serve as electronics catch trap, have accumulated a large amount of light induced electrons and effectively displaced electronics, because contrary just with electronics of the direction of motion of photohole, so TiO 2the electronics produced after being subject to illumination optical excitation has directly moved to BiVO from its higher conduction band 4lower conduction band, photohole is then from lower BiVO 4valence band migrates to higher TiO 2valence band, thus achieve effectively being separated of electronics and hole, improve speed of reaction.BiVO 4with TiO 2between serve good coupling and systemic effect.In addition, Fe 3+at TiO 2surface produces defect, and the shallow gesture becoming photo-generate electron-hole right catches trap, makes TiO 2there is the simultaneous situation of type p-n photoresponse in nanocrystalline electrode, thus effectively extends photogenerated charge recombination time, reduce the probability of compound, improve TiO 2photocatalytic activity.
The open the present invention of this written description use-case, comprises optimal mode, and also enables those skilled in the art manufacture and use the present invention.Of the present inventionly the scope of granted patent can be defined by the claims, and other example that those skilled in the art expect can be comprised.If other example this has the structural element of the literal language not differing from claims, if or other example this comprises and the equivalent structure element of the literal language of claims without substantial differences, then other example this is intended to be within the scope of claims.Can not cause under inconsistent degree, be incorporated herein by reference to by all references part of reference herein.

Claims (8)

1. a Method for comprehensive treatment of sludge, is characterized in that: the method comprises the following steps:
(1) multi stage precipitation; (2) biochemical treatment; (3) aeration and catalyzing; (4) recycling sludge process,
Described recycling sludge process comprises: the active sludge produced in multi stage precipitation, biochemical treatment, aeration and catalyzing treating processes collects by (a); (b) by sludge air drying to moisture content lower than 15 % by weight, then in mud, add flyash and quartz sand, the amount of flyash and quartz sand is respectively 1-5 % by weight and 1-3 % by weight based on the weighing scale of described mud, stirs 5-20 hour; C () then adds the Vltra tears of polyacrylamide based on the weighing scale 0.01-0.08 % by weight of described mud and 0.02-0.08 % by weight wherein, stir 1-8 hour; (d) by the material of step (2) at ambient conditions air-dry to water-content lower than 8 % by weight, being then crushed to particle diameter is below 5mm; E mud after fragmentation is manufactured haydite by ().
2. method according to claim 1, wherein said multi stage precipitation step comprises one-level advection sedimentation, secondary advection sedimentation, flocculation reaction and flocculation sediment, and the effluent stream of described advection sedimentation is to vertical with contaminant particle sedimentation direction.
3. according to the method for claim 1 or 2, wherein one-level advection sedimentation carries out in one-level horizontal sedimentation tank, and secondary advection sedimentation carries out in secondary horizontal sedimentation tank, and flocculation reaction is carried out in flocculation tank, and flocculation sediment carries out in flocculation sedimentation tank.
4. the method any one of aforementioned claim, wherein in biochemical treatment step, comprises aerobic treatment and anaerobic treatment; Aerobic treatment mainly carries out nitrification and organic removal, and the bottom in aerobic treatment district is provided with aeration sandpipe to play stirring action while aeration aerating, is provided with triphase separator on top, aerobic treatment district; Anaerobic treatment district mainly carries out denitrification and sewage sludge storage.
5. the method any one of aforementioned claim, wherein in biochemical treatment step, flows uniformly across the preset aerobic filtrate with aerobic bacterial classification and the anaerobism filtrate with anaerobic species by the sewage through precipitation process.
6. the method any one of aforementioned claim, wherein in aeration and catalyzing step, carries out bubbling to the water body adding catalyzer, carries out aeration and catalyzing process.
7. method according to claim 6, wherein in aeration and catalyzing step, uses based on TiO 2photocatalyst carry out aeration and catalyzing.
8., according to the method for claim 6 or 7, wherein in aeration and catalyzing step, through the water of step (2) biochemical treatment after diatomite filtration process, then aeration and catalyzing will be carried out.
CN201510346591.2A 2015-06-22 2015-06-22 Overall treatment method for sludge Pending CN105000763A (en)

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