A kind of high efficiency anaerobic reactor for the processing of fuel ethanol wastewater secondary anaerobic
Technical field
The present invention relates to fuel ethanol wastewater treatment unit, particularly a kind of high efficiency anaerobic reactor for the processing of fuel ethanol wastewater secondary anaerobic.
Background technology
Alcohol fuel has the features such as clean, renewable, can reduce the discharge of carbon monoxide and hydrocarbon polymer in vehicle exhaust, it is the important component part of renewable energy source, at substitute energy, improve environment, promote agriculture industrialization, realize the aspect such as growth of agricultural efficiency, increasing peasant income and there is vital role.At present, the strategic planning of national development alcohol fuel requires " do not strive grain with people, do not strive ground with grain ", and actively the non-grain alcohol fuel of scientific development, adheres to taking non-grain as main, encourages raw material diversification, becomes Fuel Ethanol development trend.Potato starch matter alcohol fuel mainly comprises the raw starchy material of the root such as cassava and Ipomoea batatas, because it has processing characteristics good, be applied to the desirable alternative materials of extensive fuel ethanol production, in the non-grain starchiness of potato class fuel ethanol production process, produce a large amount of acid high-temperature high concentration organic waste water, every production 1t alcohol fuel can produce 11~15t processing wastewater, wastewater temperature is more than 60 DEG C, pH is 4~5, COD (chemical oxygen demand (COD)) is 40000~80000mg/L, viscosity is large, suspension content is high and be difficult for solid-liquid separation, but produce in the treating processes of the waste water producing in alcohol fuel process at qualified discharge also facing to great number of issues at non-grain starchy material: as high in suspension content, intractability is large, processing cost is high, be difficult to be applied to extensive industrialized development etc.Anaerobic-aerobic combination process is the classical technique of fuel ethanol wastewater processing.Traditional fuel ethanol wastewater is generally after solid-liquid separation, adopt " one-level anaerobism+aerobic " art breading, but traditional technology exists pre-treatment expense high, investment is large, unstable, thereby follow-up anaerobic treatment is made troubles, easily system is impacted, in addition because the suspended solids content of such waste water is higher, application high efficiency anaerobic reactor UASB, there is unfavorable factor in EGSB, and exist the residues such as cassava and enter the blockage problem that treatment system causes, large-scale complete mixed anaerobically fermenting is difficult for stirring, sludge loss problem (digested sludge is difficult for precipitation and reclaims) etc., one-level anaerobic effluent viscosity is large simultaneously, liquid-solid separation difficulty, full lees wastewater anaerobic operation volumetric loading is conventionally at 2.5KgCOD/m
3d left and right, affects fuel ethanol production and economic benefit, and traditional method need carry out thermophilic digestion liquid being back to one-level high temperature anaerobic tank after mud separation, causes energy consumption and investment greatly to increase, and is not suitable for large-scale treatment system.Before entering secondary anaerobic, suspended substance can not effectively be removed simultaneously, and SS content, still up to 6000~12000mg/, has a strong impact on the continuous high-efficient operation of the anaerobic reactors such as follow-up UASB.Can not extract to greatest extent the energy (biogas) in waste water, after processing by traditional aerobic process, ammonia nitrogen, total nitrogen can not effectively be removed simultaneously, and the clearance of nitrogen phosphorus is difficult to the effect that reaches stable.Patent " the non-grain starchiness of potato class alcohol fuel grain liquid processing method " discloses a kind of method of fuel ethanol wastewater processing, but in the method, secondary anaerobic reactor adopts UASB, gas stirring intensity a little less than, ydrodynamics is poor, add water quality viscosity large, cause mass transfer effect not good, COD clearance is only 50% left and right.Follow-up aerobic biochemical technique, owing to lacking high-quality carbon source, causes nitric efficiency to decline.
Summary of the invention
Goal of the invention: technical problem to be solved by this invention is for the deficiencies in the prior art, provides a kind of high efficiency anaerobic reactor for the processing of fuel ethanol wastewater secondary anaerobic, in order to promote anaerobic treatment efficiency, takes into account and promotes follow-up denitrification effect.
The invention discloses a kind of high efficiency anaerobic reactor for the processing of fuel ethanol wastewater secondary anaerobic, comprise cylindrical shell, in cylindrical shell by lower from be divided into four regions, be respectively complete mixing zone, the first internal recycle district, the second internal recycle district and solid-liquid displacement zone; Water inlet water distributor, the first mud guiding plate are set in described complete mixing zone from the bottom to top, and the first aeroscopic plate; Described the first internal recycle district arranges the first internal recycle sleeve, the second aeroscopic plate from the bottom to top, and the first reflection cone,, material declines in the first internal recycle sleeve, and rising to form in the first internal recycle sleeve outside circulates; Described the second internal recycle district arranges the second internal recycle sleeve, the second mud guiding plate, the second reflection cone, collection chamber from the bottom to top, and the biogas fairlead at connected set air chamber top, material is at the second internal recycle sleeve) in rise, declining to forming in the second internal recycle sleeve outside circulates; Gas solid separation ring flat-plate and overflow weir are set from the bottom to top, wherein overflow weir external connection row water pipe, externally connected exhaust pipe on the cylinder lateral wall of gas solid separation ring flat-plate below in described solid-liquid displacement zone.
In the present invention, described cylindrical shell cross section is circle or rectangle.
In the present invention, described the first mud guiding plate is circular cone tubular, and upward, taper cone barrel sidewall and horizontal plane inclination angle scope are 20 degree~70 degree in taper cone barrel tip.
In the present invention, described the first aeroscopic plate is circular cone tubular, and taper cone barrel tip down, tip is provided with through hole, via area is 1%~10% of cylindrical shell cross-sectional area, and the inclination angle of taper cone barrel sidewall and horizontal plane is 20~70 °, and the maximum outside diameter of the first aeroscopic plate is less than the internal diameter of cylindrical shell correspondence position.
In the present invention, described the first internal recycle sleeve pipe is tubulose, and bore is cylinder internal diameter 60%~90%.
In the present invention, described the second aeroscopic plate is circular cone tubular, and taper cone barrel tip upward, and tip is provided with through hole, and via area is 0.1~5% of cylindrical shell cross-sectional area, and the inclination angle of taper cone barrel sidewall and horizontal plane is 20~70 °.
In the present invention, described the first reflection cone and the second reflection cone are circular cone tubular, and down, taper cone barrel sidewall and horizontal plane inclination angle scope are positive and negative 20 degree~70 degree in taper cone barrel tip.
In the present invention, described the second internal recycle sleeve is tubulose, and bore is cylinder internal diameter 10%~50%.
In the present invention, the second mud guiding plate is circular cone tubular, and taper cone barrel tip upward, tip is provided with through hole, via area is 0.1%~5% of cylindrical shell cross-sectional area, the inclination angle of taper cone barrel sidewall and horizontal plane is 20~70 °, and taper cone barrel sidewall and collection chamber sidewall sections are overlapping, and the maximum outside diameter of the second mud guiding plate is less than the internal diameter of cylindrical shell correspondence position.
In the present invention, described collection chamber bottom is taper gas bucket, and upward and be provided with through hole and be communicated with biogas fairlead, collection chamber top is cylindrical, square, taper shape or polygonal pyramid shape in tip.
In the present invention, described gas solid separation ring flat-plate is circular cone tubular, and taper cone barrel tip down, and tip is provided with through hole, and via area is 1%~10% of pond cross-sectional area, and the inclination angle of taper cone barrel sidewall and horizontal plane is 20~70 °.
In the present invention, described chemical feed pipe is used for adding medicament, regulates pH value and basicity in reactor.Outside, chemical feed pipe pond is arranged with inlet valve.
Backflow water inlet pipe described in the present invention, for the nitrate wastewater that contains of the follow-up aerobic treatment technique generation that refluxes.Outside, backflow water inlet pipe pond is arranged with inlet valve.
Advantage of the present invention is:
1, make full use of biogas rising kinetic energy, drive the liquid of three reaction zones to occur to flow.Particularly, in Liang Ge internal recycle district, form air lift internal recycle stream, increased the turbulent fluctuation of waste water, reduce the impact of viscosity on waste water mass transfer, improve biochemical reaction efficiency.
2, vertically more easily forming acidication, producing being separated of methane and anoxic denitrogenation, can inject pH regulator medicament by chemical feed pipe, in the situation that acidifying occurs in mixing zone completely, still can control the first internal recycle district is pH neutrality, form vertical diphasic anaerobic environment, improve reaction efficiency.Return line injects the nitrate wastewater that contains producing containing the follow-up aerobic biochemical reaction of nitrate, carries out denitrification in the second internal recycle district, can play the effect of denitrogenation.
The solid-liquid that 3, can improve reactor is held back efficiency.Because reactor is vertically divided into four parts, can promote heavy granule sludge to rest on reactor lower part.And biogas is due to after multistage collection, the possibility excessive by gap reduces greatly, avoided the turbulent fluctuation of solid-liquid displacement zone liquid, improves solid-liquid separation effect.
Embodiment
According to following embodiment, the present invention may be better understood.But, those skilled in the art will readily understand, the described content of embodiment is only for the present invention is described, and should also can not limit the present invention described in detail in claims.
As shown in Figure 1, the invention discloses a kind of high efficiency anaerobic reactor for the processing of fuel ethanol wastewater secondary anaerobic, comprise cylindrical shell 1, in cylindrical shell by lower from be divided into four regions, be respectively complete mixing zone A, the first internal recycle district B, the second internal recycle district C and solid-liquid displacement zone D; Water inlet water distributor 16, the first mud guiding plate 2 are set in described complete mixing zone from the bottom to top, and the first aeroscopic plate 3; Described the first internal recycle district arranges the first internal recycle sleeve 4, the second aeroscopic plate 5 from the bottom to top, and the first reflection cone 6; Described the second internal recycle district arranges the second internal recycle sleeve 7, the second mud guiding plate 8, the second reflection cone 9, collection chamber 10 from the bottom to top, and the biogas fairlead 13 at connected set air chamber 10 tops; Gas solid separation ring flat-plate 11 and overflow weir 12 are set from the bottom to top, wherein overflow weir 12 external connection row water pipes 14, externally connected exhaust pipe 15 on the cylinder lateral wall of gas solid separation ring flat-plate 11 belows in described solid-liquid displacement zone.Described cylindrical shell cross section is circle or rectangle.Described the first mud guiding plate is circular cone tubular, and upward, taper cone barrel sidewall and horizontal plane inclination angle scope are 20 degree~70 degree in taper cone barrel tip.Described the first aeroscopic plate is circular cone tubular, and taper cone barrel tip down, and tip is provided with through hole, and the inclination angle of taper cone barrel sidewall and horizontal plane is 20~70 °, and the maximum outside diameter of the first aeroscopic plate is less than the internal diameter of cylindrical shell correspondence position.Described the first internal recycle sleeve pipe is tubulose, and bore is cylinder internal diameter 60%~90%.Described the second aeroscopic plate is circular cone tubular, and taper cone barrel tip upward, and tip is provided with through hole, and via area is 0.1~5% of cylindrical shell cross-sectional area, and the inclination angle of taper cone barrel sidewall and horizontal plane is 20~70 °.Described the first reflection cone and the second reflection cone are circular cone tubular, and down, taper cone barrel sidewall and horizontal plane inclination angle scope are 20 degree~70 degree in taper cone barrel tip.Described the second internal recycle sleeve is tubulose, and bore is cylinder internal diameter 10%~50%.The second mud guiding plate is circular cone tubular, and taper cone barrel tip upward, and tip is provided with through hole, the inclination angle of taper cone barrel sidewall and horizontal plane is 20~70 °, taper cone barrel sidewall and collection chamber sidewall sections are overlapping, and the maximum outside diameter of the second mud guiding plate is less than the internal diameter of cylindrical shell correspondence position.Described collection chamber bottom is taper gas bucket, and upward and be provided with through hole and be communicated with biogas fairlead, collection chamber top is cylindrical, square, taper shape or polygonal pyramid shape in tip.The first internal recycle district and the second internal recycle district are respectively equipped with chemical feed pipe and backflow water inlet pipe.
Embodiment
As shown in Figure 1, the present invention proposes a kind of novel high efficiency anaerobic reactor, comprises cylindrical shell 1, in cylindrical shell by lower from be divided into 4 sections, be respectively complete mixing zone, internal recycle 1st district, internal recycle 2nd district and solid-liquid displacement zone.Waste water enters complete mixing zone through bottom water inlet pipe 16.There is granule sludge and floc sludge in the mud in mixing zone completely, a large amount of biogas that produces under the completely mixed effect that is incorporated in anerobe in this region.Biogas is guided by the first mud guiding plate 2 and the first aeroscopic plate 3 after producing, enter in the annular crack of the first aeroscopic plate 3 and cylindrical shell 1, rise and enter the annulus of the first internal recycle sleeve 4 in internal recycle 1st district and cylindrical shell 1 along cylindrical shell, along with the gas stripping of biogas-lift, as shown by arrows in FIG., region outside the first internal recycle sleeve 4 in internal recycle 1st district forms ascending current, after upwelling contacts with the first reflection cone 6 with the first aeroscopic plate 5, flowing to changes enters under the intermediate formation of the first internal recycle sleeve 4 to stream.The lower outside that again enters the first internal recycle sleeve 4 to the first aeroscopic plate 3 generation reflections of stream chance.Under the promotion producing at lasting biogas, internal recycle 1st district forms the internal recycle of katabatic drainage in the outer upwelling of sleeve and sleeve.Good internal recycle can enhance liquid turbulent flow intensity, reduce the impact of stickiness on mass transfer.Biogas in internal recycle 1st district is guided by the first reflection cone 6 and the first aeroscopic plate 5, as shown by arrows in FIG., enters the interior formation air lift of the second internal recycle sleeve 7 upwelling in internal recycle 2nd district.Guided by the second mud guiding plate 8, the second reflection cone 9, at the outer formation katabatic drainage of the second internal recycle sleeve 7, form internal recycle.Biogas enters collection chamber 10 through the outer row of biogas fairlead 13.In internal recycle 2nd district, there is a small amount of remaining biogas to be held back by gas solid separation ring flat-plate 11, through the outer row of vapor pipe 15.Meanwhile, on part current direction, enter solid-liquid displacement zone, through overflow weir 12, the outer row of water shoot 14.Internal recycle 1st district, internal recycle 2nd district are respectively equipped with chemical feed pipe 17 and backflow water inlet pipe 18.
Crude fuel alcohol wastewater one-level anaerobically fermenting water outlet COD8000mg/L, enter respectively UASB reactor and this reactor, entering water outlet COD after UASB reactor for treatment is 4000mg/L, and SS is 2000mg/L, this reactor water outlet COD is 2000mg/L, and SS is 600mg/L.
The invention provides a kind of high efficiency anaerobic reactor for the processing of fuel ethanol wastewater secondary anaerobic; method and the approach of this technical scheme of specific implementation are a lot; the above is only the preferred embodiment of the present invention; should be understood that; for those skilled in the art; under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.In the present embodiment not clear and definite each integral part all available prior art realized.