CN101935137B - Method and device for separating silt in feed solution for methane fermentation - Google Patents

Method and device for separating silt in feed solution for methane fermentation Download PDF

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Publication number
CN101935137B
CN101935137B CN2010102666131A CN201010266613A CN101935137B CN 101935137 B CN101935137 B CN 101935137B CN 2010102666131 A CN2010102666131 A CN 2010102666131A CN 201010266613 A CN201010266613 A CN 201010266613A CN 101935137 B CN101935137 B CN 101935137B
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China
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silt
ramp
raw
tank
separating tank
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CN2010102666131A
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Chinese (zh)
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CN101935137A (en
Inventor
张燕生
庞昌乐
董仁杰
李晓华
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中国农业大学
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Abstract

The invention provides a device for separating silt in a feed solution for methane fermentation, which comprises a raw material adjusting basin, a hydrolyzing basin, a silt separating tank and a water collecting well, a stirrer and a raw material delivery pump are arranged in the raw material adjusting basin, a ramp way with barrier plates on both sides is connected between the lower part of a water outlet of the raw material delivery pump and a water inlet end of the hydrolyzing basin, one water drain pipe leading to the hydrolyzing basin is arranged respectively along both side walls from both ends of the lowest low-lying land of the starting point of the ramp way near the side walls, an air blower nozzle is installed in the silt separating tank, an air blower is installed outside the silt separating tank, and a downflow weir is arranged above the connecting part of the silt separating tank and the water collecting well. The invention also provides a method for separating silt by using the device. The invention has good silt separation effect and small organic matter loss, and is especially applicable to the silt separation pretreatment of high concentration organic sewage containing a great amount of silt, such as chicken manure, cow dung and the like.

Description

Silt separates in the biogas fermentation material liquid method and device thereof
Technical field
The present invention relates to a kind of silt separation method and device that contains the silt organic sewage, relate in particular to high concentrated organic wastewaters such as vaccary, chicken farm and carry out silt separating technology and the equipment of biogas fermentation when handling.
Background technology
In recent years, the development of the biogas fermentation application project of China is very fast, but in the higher organic wastewater biogas fermentation engineering of one type of silt content such as cow dung, chicken manure, exists the silt separation difficulty, has a strong impact on the problem of equipment performance and operational effect.
The biogas fermentation Anaerobic Treatment far away from aerobe handle be widely used, technology maturation; Therefore but the two belongs to wastewater biological method treatment technology again, in biogas fermentation equipment a large amount of correlation techniques of using for reference or directly having applied mechanically Aerobic Process for Treatment in development or the exploitation of corollary equipment such as pretreatment of raw material particularly.Sewage sand setting treatment process method such as comparatively ripe at present has horizontal flow type grit chamber, vertical sedimentation basin, radial flow settling basin etc.; But all these type of technical equipment all are to come from traditional sewage aerobic biological treatment, and almost not having an example is the maturation process equipment that aims at the biogas fermentation exploitation.This type technology has at least two shortcomings to make it can not be fit to biogas fermentation: the basic goal of this type of first process equipment is sewage purification; What it was pursued is from water, to separate solid content; And biogas fermentation many a free-revving engine, it also pursues energy output except purification of water quality; Require organic matter is turned waste into wealth as much as possible, change into biogas.Therefore require only to remove the silt particle in the solid content during raw material desanding of biogas fermentation, organic solid will stay product biogas as far as possible.It two is design theories from this kind equipment, also can not be well suited for being applied to biogas fermentation, and the setting pot design in the sewage disposal depends on basic theories such as free settling theory, shallow layer settling principle, desirable sedimentation basin model; Settlement calculation is mostly utilized the Stokes theoretical formula.This type design theory and computational methods all are to be based upon on the simple two phase flow model; More be applicable to the Separation of Solid and Liquid of low concentration solid content fluid relatively; The sewage that aerobic method is handled is this type of low concentration of water mostly; But biogas fermentation pays attention to high concentration solid content raw material especially, pay attention to the multiphase flow model that much complicated high concentration is separated, belonged to organic solid and solid-solid phase macroscopic view of inoganic solids, and above-mentioned theory and computational methods are obviously no longer suitable.
Therefore, the applied sand setting technology of biogas fermentation engineering should be used for concentration very low city domestic sewage, industrial wastewater relatively at present, contains silt sewage and should not directly be used for the much higher cow dung of solid concentration, chicken manure etc.In the aerobic Biological Treatment of Waste Water engineering, the way of diluting former water through modes such as processing water backflows is arranged, but this practice is not suitable for requiring the biogas fermentation of high concentration raw material, especially can not be used for the scale biogas engineering.Because the annual aerogenesis of this type engine request must guarantee fermentation temperature, so it is low more to handle waste strength, cost is high more, especially the energy output reduce more, even production capacity not only, higher than traditional aerobic method energy consumption on the contrary.
In sum, we can say the raw material desanding technology that does not have in the marsh gas fermentation process to the comparative maturity of self material characteristic.The scientific research of biogas engineering and technological development concentrate on anaerobic fermentation and reactor the earliest, at present biogas residue and biogas liquid handle and comprehensive utilization aspect also strengthened, but pretreatments of raw material such as desanding research and development extremely thin a little less than, technology seriously falls behind.Therefore the high biogas fermentation engineering that contains silt nearly all exists an inferior separating effect or the high difficult problem of organic matter loss.How effectively how separation of sediment realizes between particularly organic solid content and the silt particle that two of macroscopic view are separated, and is considered to the difficult point place of this type silt high-load raw material when biogas fermentation.
Summary of the invention
The purpose of this invention is to provide a kind of biogas fermentation material liquid silt separation apparatus, comprise raw material regulating reservoir, hydrolytic tank, silt separating tank, sump, the raw material regulating reservoir is provided with agitator and former material conveying pump; Be connected with the ramp of both sides tool baffle plate between former material conveying pump delivery port below and the hydrolytic tank water inlet end; Begin near sidewall at two ends, the most low-lying place of starting point, said ramp, sidewall is respectively established a drainpipe along two ends, leads to hydrolytic tank; In the said silt separating tank air blast spout is installed; The outside is equipped with air blast, and the air blast spout links to each other with air blast, is provided with downflow weir on the top of silt separating tank and sump junction.The spout of said air blast is positioned at the below of downflow weir.
Said ramp length is 0.5m~1.5m; Said ramp also is provided with the elevation angle, and generally this elevation angle is in 15 °~40 ° scopes; The surface in said ramp is up-and-down ripple rib shape, and its peak line or hollow line flow to vertical with feed liquid.
Said hydrolytic tank separates the slot type integral structure with silt, the bottom is interconnected, and said silt separating tank bottom is " V " font.
Another purpose of the object of the invention provides a kind of method of utilizing the said apparatus separation of sediment, may further comprise the steps:
1), raw material homogeneous pond or raw material regulating reservoir are set according to raw material treating capacity and morphological feature; The solid concentration of general livestock breeding wastewater is very high and extremely inhomogeneous; Should do stirring homogeneous and concentration adjustment processing before getting into the silt separating technology; When solid concentration is too high, can use the dilution of biogas fermentation phegma, concentration is controlled at 4%~8% and is advisable.
2) next-door neighbour's raw material regulating reservoir is provided with hydrolysis acidification pool, and the grit that a kind of both sides band baffle plate is set between two ponds separates the ramp, as the primary separation operation, is mainly used in the grit that separates greater particle size.Material liquid is transported to through former material conveying pump in the ramp of both sides band baffle plate, and in this process, coarse granule silt sharply loses kinetic energy; Finally in gravity effect deposit in low-lying place; And organic matter density is less, and kinetic energy rejection is less relatively, but overflow gets into hydrolytic tank.
3), during former material conveying pump shuts down, the sewage of retention in the ramp of both sides band baffle plate can pass through special-purpose discharge-channel and enter hydrolytic tank, the silt that stays is got rid of through manual work or mechanical means.
4), hydrolysis acidification preliminary treatment: material liquid is crossed the overflow of above-mentioned ramp and is got into hydrolysis acidification pool, through hydrolysis acidification, Gu shape organic matter surface begins liquefaction, weakens with the silt adhesion, and separation desanding, the minimizing organic matter be convenient to after this run off.The demurrage of hydrolysis acidification process (HRT) is very important, should guarantee, organic matter and silt particle separating difficulty strengthened when hydrolysis time was not enough, has a strong impact on the desanding effect of back; The long meeting of hydrolysis time causes organic matter loss, CO 2Increase, influence biogas fermentation.Therefore, in order to realize final purpose of the present invention, can adopt processes such as batch-type (intermittently batch-type) technology or push flowing (comprising continuous or semicontinuous operation) reactor, with the HRT that guarantees to suit.Formula according to HRT=V/Q is guaranteed HRT, and wherein V is the dischargeable capacity of hydrolytic tank and silt separating tank, and Q is for handling flow.
5) separation of sediment: be advanced to the silt particle separating tank through hydrolysis acidification pretreated material, the tangential air jet system is set in the groove, top is provided with downflow weir, and inflation solution is being carried bubble secretly and is being the rotation fluidised form and rises to downflow weir.The dissolved air flotation groove is that one is communicated with structures with hydrolysis acidification pool, but inflation only limits to separating tank, and bubble and cyclonic action are restricted in the separating tank, do not involve the hydrolysis acidification section.Because the hydrolysis section fluid density is big, aerated liquid density is little in the separating tank, thereby forms pressure reduction, raises separating tank liquid water level formation up-flow and overflows.Because organic matter liquefies, is easy to variations such as air supporting through hydrolysis acidification preliminary treatment meeting generation imbibition, surface; Specific density is much bigger mutually with organic matter to be adsorbed on the surperficial sandstone of liquid film; Its inertia force and centrifugal force are much bigger; Thereby in choppy cross-current or eddy flow process relative motion takes place, peel off with organic matter.Organic solid content of peeling off is easy to adsorb bubble, is suspended state, can under the air supporting effect, overflow by up-flow.And in this process; Density is big, absorption bubbling ability and the very weak sandstone of buoyance lift ability laterally get rid of under centrifugal action to wall, advances along the wall eddy flow then, and the separating tank inwall is provided with the roadblock thing of short muscle or netted form; Sandstone loss of momentum in constantly rotating change direction process is very fast; Each other collision effect between the interception function of roadblock thing and sandstone in addition finally loses kinetic energy fully and lands, and realizes that the macroscopic view two of organic matter and sandstone is separated.Silt particle separating tank cross section is with circular or oval for well, and effective depth is not less than 2 meters, and blow rate required W can be according to computes:
W=1.3×h 2×Q÷(23×k×Ln((h 1+10)÷10))
Q in the formula---treating capacity [m 3/ h]
h 1---the air intlet extreme lower position is to the height [m] between the hydrolytic tank liquid level
h 2---the water-head [m] of high liquid level (HLL) of silt particle separating tank and hydrolytic tank liquid level
K---separating tank rises liquid efficient
K value and raw material type, homogenizing effect, concentration of suspension, aerator are relevant, are test parameters.For the high concentration ight soil class sewage raw material through abundant stirring homogenization processing, the k value is between 0.2~0.35.
The method that provides of the present invention is simple, the silt good separating effect, and the organic matter loss is little, is particularly suitable for the silt separation preliminary treatment that chicken manure, cow dung etc. contain the more high concentration organic sewage of silt.
Description of drawings
Shown in Figure 1 is the silt separation apparatus sketch map.Among the figure 1, the raw material regulating reservoir; 2, hydrolytic tank; 3, the silt particle separating tank; 4, the raw material stirring device; 5, former material conveying pump; 6, grit separates the ramp; 7, air blast; 8, downflow weir; 9, sump; 10, the blast pipe spout; 11, drainpipe.
The specific embodiment
Following examples are used to explain the present invention, but are not used for limiting scope of the present invention.Under the situation that does not deviate from the present invention's spirit and essence, modification or replacement to the inventive method, step or condition are done all belong to scope of the present invention.
If do not specialize the conventional means that used technological means is well known to those skilled in the art among the embodiment.
Embodiment 1
Device in this example comprises raw material regulating reservoir 1, hydrolytic tank 2, silt separating tank 3, sump 9, and wherein hydrolytic tank 2 is integrated with silt particle separating tank 3.Raw material regulating reservoir 1 is provided with agitator 4 and former material conveying pump 5; Be connected with the ramp 6 of both sides band baffle plate between former material conveying pump 5 delivery ports below and hydrolytic tank 1 water inlet end; Two ends, the most low-lying place of 6 starting points begin near sidewall in the ramp, and sidewall is respectively established a drainpipe 11 and led to hydrolytic tank 2 along two ends.The silt separating tank 3 inner air blast spouts 10 of installing, the outside air blast 7 of installing, air blast spout 10 links to each other with air blast 7, on the top of silt separating tank 3 and sump 9 junctions downflow weir 8 is set.The position of air blast spout 10 is arranged on the below of downflow weir 8.
The length in the ramp 6 of both sides band baffle plate is 0.5m, and angle is 30 °, and ramp surface is made into up-and-down ripple rib shape, and peak line or hollow line flow to vertical with feed liquid.
Lay the bar dowel perpendicular to inwall at silt separating tank 3 inwalls, bar dowel length 3cm distributes according to positive rhombus, and the water chestnut edge lengths is 10cm.
Embodiment 2
The device that provides with embodiment 1 carries out the silt separation to cow dung biogas fermentation material liquid, and technological process is following:
1) cow dung the raw material regulating reservoir stir and this with the fermentation withdrawing fluid mixes, the adjusting solid concentration about 7%;
2) after the complete operation step 1), with 6 hours be one-period batch-type operate as follows;
3) cleaning ramp, the drainpipe inlet that will be positioned at the both sides, ramp is lived with simple and easy cap seal;
4) air blast of startup silt particle separating tank, gas liquid mixture is the eddy flow attitude in the separating tank, and density is lower than hydrolytic tank, and liquid level water level raises and crosses downflow weir entering sump;
5) behind the air blast of startup silt particle separating tank; Start the delivery pump of raw material regulating reservoir immediately; The cow dung raw material of 7% solid concentration separates the ramp through the rough sand stone that delivery pump pours both sides band baffle plate, and overflow gets into hydrolytic tank, falls in the ramp at this process medium coarse sand stone;
Close former material conveying pump when 6) the raw material conveying capacity reaches hydrolytic tank (comprising the silt particle separating tank) available capacity, close the separating tank air blast subsequently;
7) open the simple and easy lid that both sides, ramp by-pass enters the mouth, retention liquid enters hydrolytic tank, the sandstone in the ramp of artificial removing both sides band baffle plate;
8) intermittently repeat above-mentioned 3 after 6 hours) to 7) operation.
Through the cow dung that said method is handled, inorganic solid content interception capacity is greater than 95% more than the particle diameter 0.3mm; 0.2mm more than inorganic solid content interception capacity be more than 80%; 0.1mm inorganic solid content interception capacity is not less than 50%; Organic matter loss rate is lower than 5%.

Claims (10)

1. biogas fermentation material liquid silt separation apparatus; Comprise raw material regulating reservoir (1), hydrolytic tank (2), silt separating tank (3), sump (9); Raw material regulating reservoir (1) is provided with agitator (4) and former material conveying pump (5); Be connected with the ramp (6) of both sides band baffle plate between former material conveying pump delivery port below and the hydrolytic tank water inlet end, starting point is respectively established a drainpipe (11) and is led to hydrolytic tank (2) along the two side in said ramp, and air blast spout (10) is installed in the said silt separating tank (3); And continuous in being installed in the outside air blast (7) of silt separating tank (3), be provided with downflow weir (8) on the top of silt separating tank (3) and sump (9) junction.
2. device according to claim 1 is characterized in that, the ramp (6) of said both sides band baffle plate is provided with 15 °~40 ° the elevation angle.
3. device according to claim 1 and 2 is characterized in that, the length in the ramp (6) of said both sides band baffle plate is 0.5~1.5m.
4. according to each described device of claim 1~3, it is characterized in that the surface, ramp (6) of said both sides band baffle plate is up-and-down ripple rib shape, its peak line or hollow line flow to vertical with feed liquid.
5. device according to claim 1 is characterized in that, the bottom of said silt separating tank (3) is the V-shape structure.
6. according to claim 1 or 5 described devices, it is characterized in that the inwall of said silt separating tank (3) is provided with the roadblock thing of short muscle or netted form.
7. device according to claim 1 is characterized in that, said air blast spout (10) is positioned at the below of downflow weir (8).
8. use the described device of claim 1 to carry out the silt separation method, comprise the steps:
1), the biogas fermentation raw material is pushed in the raw material regulating reservoir (1), stirs with agitator (4), and raw material is diluted to concentration in 8%; 2), through former material conveying pump (5) material liquid is transported in the ramp (6) of both sides band baffle plate and carries out primary separation, the material liquid overflow of carrying granule silt gets into hydrolytic tank (3) acidifying, oarse-grained sediment settlement is in the ramp (6) of both sides band baffle plate; 3), material liquid carries stopping period, the sewage of retention in the ramp (6) of both sides band baffle plate in entered the hydrolytic tank acidifying, the silt in manual work or the mechanical means removal ramp; 4), be advanced in the silt separating tank (3) through the material liquid of hydrolysis, and open air blast (7), organic matter is realized separating with silt in spiral up-flow process, and the organic matter overflow that separates with silt gets into sump (9).
9. separation method according to claim 8 is characterized in that, said material liquid is pressed the dischargeable capacity sum of hydrolytic tank (2) and silt particle separating tank (3) and confirmed with the ratio of handling flow in the demurrage of hydrolytic tank acidifying.
10. separation method according to claim 8 is characterized in that, the sewage of said retention in the ramp (6) of both sides band baffle plate enters hydrolytic tank (3) through drainpipe (11).
CN2010102666131A 2010-08-30 2010-08-30 Method and device for separating silt in feed solution for methane fermentation CN101935137B (en)

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Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102603134A (en) * 2012-03-16 2012-07-25 山东民和生物科技有限公司 Two-stage sand removal process for livestock manure
CN104628104B (en) * 2013-11-15 2017-09-26 袁宏文 The only institute's Sewage Treatment Facilities of town and country Gu Lou
CN103645212A (en) * 2013-12-03 2014-03-19 镇江腾龙智能科技有限公司 Sand trap added on probe measurement chamber base of online streaming potential measuring instrument
CN104386890A (en) * 2014-11-02 2015-03-04 贵州柳江畜禽有限公司 Method for removing grit from chicken dung
CN105727600A (en) * 2016-02-29 2016-07-06 上海大学 On-site desilting system and silt separation method for high-silt source water
CN107398342A (en) * 2016-05-20 2017-11-28 北京科林思源能源环境科技发展有限责任公司 A kind of laminar flow material sand essence isolation technics

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RU2234468C1 (en) * 2003-08-22 2004-08-20 Андрюхин Тимофей Яковлевич Methane tank
CN2646146Y (en) * 2003-06-11 2004-10-06 何建军 Sand removing methane generating pit
CN2784406Y (en) * 2004-07-16 2006-05-31 肖亭 A novel structure of household biogas generating pit
JP2009072719A (en) * 2007-09-21 2009-04-09 Sanki Eng Co Ltd Methane gas producing system for producing methane gas from organic waste such as garbage

Patent Citations (4)

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Publication number Priority date Publication date Assignee Title
CN2646146Y (en) * 2003-06-11 2004-10-06 何建军 Sand removing methane generating pit
RU2234468C1 (en) * 2003-08-22 2004-08-20 Андрюхин Тимофей Яковлевич Methane tank
CN2784406Y (en) * 2004-07-16 2006-05-31 肖亭 A novel structure of household biogas generating pit
JP2009072719A (en) * 2007-09-21 2009-04-09 Sanki Eng Co Ltd Methane gas producing system for producing methane gas from organic waste such as garbage

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