CN104130942B - 农业有机废弃物厌氧发酵回收沼气反应装置及回收方法 - Google Patents
农业有机废弃物厌氧发酵回收沼气反应装置及回收方法 Download PDFInfo
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- CN104130942B CN104130942B CN201410348997.XA CN201410348997A CN104130942B CN 104130942 B CN104130942 B CN 104130942B CN 201410348997 A CN201410348997 A CN 201410348997A CN 104130942 B CN104130942 B CN 104130942B
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound data:image/svg+xml;base64,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 data:image/svg+xml;base64,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 C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 41
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 39
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- 239000010802 sludge Substances 0.000 claims abstract description 13
- 238000006731 degradation reaction Methods 0.000 claims abstract description 7
- 230000015556 catabolic process Effects 0.000 claims abstract description 6
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- 229920000573 polyethylene Polymers 0.000 claims abstract description 4
- 239000012071 phase Substances 0.000 claims description 69
- QTBSBXVTEAMEQO-UHFFFAOYSA-N acetic acid Chemical compound 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- C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
- C12M21/00—Bioreactors or fermenters specially adapted for specific uses
- C12M21/04—Bioreactors or fermenters specially adapted for specific uses for producing gas, e.g. biogas
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
- C12M23/00—Constructional details, e.g. recesses, hinges
- C12M23/36—Means for collection or storage of gas; Gas holders
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
- C12M23/00—Constructional details, e.g. recesses, hinges
- C12M23/58—Reaction vessels connected in series or in parallel
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
- C12M27/00—Means for mixing, agitating or circulating fluids in the vessel
- C12M27/02—Stirrer or mobile mixing elements
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
- C12M29/00—Means for introduction, extraction or recirculation of materials, e.g. pumps
- C12M29/02—Percolation
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
- C12M41/00—Means for regulation, monitoring, measurement or control, e.g. flow regulation
- C12M41/12—Means for regulation, monitoring, measurement or control, e.g. flow regulation of temperature
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
- C12M41/00—Means for regulation, monitoring, measurement or control, e.g. flow regulation
- C12M41/28—Means for regulation, monitoring, measurement or control, e.g. flow regulation of redox potential
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
Abstract
本发明涉及农业有机废弃物厌氧发酵回收沼气反应装置及回收方法,包括产酸发酵相反应器和产甲烷相反应器,二者之间还存在过滤装置,其中产酸发酵相反应器采用连续搅拌釜式反应器,产甲烷相反应器采用高径比为9:1~10:1的厌氧膨胀颗粒污泥床反应器,过滤装置内部安装有材质为尼龙滤网或聚乙烯滤网的过滤材料,滤网孔径大小为0.5mm~3mm,产酸发酵相反应器、过滤装置、产甲烷相反应器总体积比为2.5~3.5:1:1;本发明能够提高农业有机废弃物在厌氧发酵系统中的降解效率,缓解设备及管路堵塞技术瓶颈,降低北方低温环境对整个厌氧发酵系统带来的波动干扰,提高系统的运行稳定性及沼气的产生速率。
Description
技术领域
[0001] 本发明涉及一种适用于农业有机废弃物厌氧发酵回收沼气的高效反应装置及利用该装置进行厌氧发酵回收沼气的方法,属于环境保护工程及废弃物资源化利用领域。
背景技术
[0002] 农业有机废弃物包括农业生产产生的各类农作物秸杆,以及畜禽养殖产生的畜禽粪便等,处理难度较大,是环境治理的一大难题。将农业有机废弃物畜禽粪便、秸杆等作为可利用的资源进行厌氧发酵回收沼气,不仅可以解决农业生产废物对环境的污染问题,同时产生的沼气可作为能源继续加以利用,实现了废弃物的无害化、减量化、资源化,符合我国对环境保护和资源可持续利用的政策方针。
[0003]目前,在我国广大农村地区,普遍应用和推广的还是以混合发酵工艺为主的厌氧反应消化系统(沼气池),虽然具有设计简单、施工方便、建设成本低的优点,但由于行使不同功能的产酸菌和产甲烷菌处于同一环境下,无法使各自优势充分发挥,造成这种系统运行效率低、连续性及稳定性差,尤其在北方寒冷地带,温度波动随时会造成系统运行效率急剧下降或运行失败。两相厌氧发酵工艺是厌氧发酵技术的革命性变革,该工艺将产酸发酵相和产甲烷相分开,成为两个独立的处理单元,各自形成产酸发酵微生物和产甲烷发酵微生物的最佳生态条件,实现完整的厌氧发酵过程,从而大幅度提高系统的处理能力、处理效果及系统稳定性。厌氧膨胀颗粒污泥床(EGSB)反应器作为第三代厌氧反应器的典型代表之一,具有比第二代厌氧反应器更加优越的特点,由于其具有较大的高径比,布水条件均匀,增加了出水回流循环,从而使得反应器内部具有较高的上升流速,增强了颗粒污泥的稳定性,促使反应器内污泥床处于膨胀状态,强化了反应器内的传质条件,减少死区,从而提高处理效果。目前,国内外已有大量学者通过实验证明EGSB工艺用于处理低温、低浓度废水具有显著的优越性和可行性。
[0004] 我国北方地区气候寒冷,尤其是在冬季,低温气候条件的限制使得沼气工程运行效果差,沼气池的应用和推广及农民的积极性均远远落后于南方地区。牛粪以及农作物秸杆组成成分中含有的纤维素、半纤维素和木质素等很难被微生物利用降解,即便在目前较为流行的两相厌氧反应系统中,也存在降解不完全、容易形成浮渣,从而造成反应器或相关管路堵塞的问题,降低处理效率的同时,增加了处理的难度和成本。
[0005] 因此,农业有机废弃物的降解和资源化过程,尤其是气候条件不具优越性的北方低温地区农业有机废弃物的降解和资源化,对厌氧发酵系统的装置、工艺选择提出了更高的要求。
发明内容
[0006] 本发明的主要目的在于针对上述问题,提供一种适用于农业有机废弃物厌氧发酵回收沼气的高效反应装置及厌氧发酵方法,利用两相厌氧生物处理技术的原理与工艺,提高畜禽粪便、秸杆等农业有机废弃物在厌氧发酵过程中的降解效率,缓解因秸杆等难降解物质造成的管路及设备堵塞问题,降低北方低温环境对整个厌氧发酵系统带来的波动干扰,提高系统的运行稳定性,缩短厌氧发酵的时间,提高厌氧发酵过程中沼气的产生速率。
[0007] 本发明为实现上述目的所采用的技术方案是:农业有机废弃物厌氧发酵回收沼气反应装置,包括产酸发酵相反应器、产甲烷相反应器,其特征在于在产酸发酵相反应器与产甲烷相反应器的连接管道上设置有过滤装置,所述过滤装置包括圆锥型壳体,壳体内腔内设置有过滤材料,壳体顶端设置有可开启或密封的盖板,壳体上下两端开设有进料口以及出料口,进料口的水平位置低于产酸发酵相反应器的出料口。
[0008] 所述过滤装置进料口的水平位置低于产酸发酵相反应器出料口的距离至少为产酸发酵相反应器总高度的2/3。
[0009] 作为优选,所述过滤材料为尼龙滤网或聚乙烯滤网,滤网孔径大小为0.5mm~3mm,
其位置位于过滤装置总高度的1/2处。
[0010] 作为优选,产酸发酵相反应器包括壳体,壳体底部的进料口、壳体一侧近上端的出料口,壳体顶端设置有排气孔,壳体内部设置有叶片搅拌器。优选采用连续搅拌釜式反应器。
[0011] 作为优选,产甲烷相反应器包括壳体,壳体内腔分为反应区和沉淀区,进料口位于反应区底部壳体上,进料口上方、反应区内部设有布水器,排气孔位于壳体顶端,出料口位于壳体顶盖下方,反应区壳体侧面设有温感探头和氧化还原电位探头,沉淀区壳体上设置有回流出水口,出水口设置有回流管道连接进料口连接实现内部回流。优选采用厌氧膨胀颗粒污泥床反应器
[0012] 作为优选,回流出水口位于反应器沉淀区总高度的1/3~1/2处。
[0013] 作为优选,过滤装置出料口与产甲烷相反应器的进料口连接管道上设置有蠕动栗Ο
[0014] 作为优选,所述的产甲烷相反应器反应区的高径比为9:1~10:1。
[0015] 作为优选,产酸发酵相反应器、过滤装置、产甲烷相反应器总体积比为2.5-3.5:1:1。
[0016] 为实现本发明目的,提供了一种农业有机废弃物厌氧发酵回收沼气反应装置回收方法,其特征在于包括以下步骤:
[0017] a)原料经预处理后,以总固形物浓度为8112%投加到经过预先抽真空除氧的产酸发酵相反应器中,并向反应器中接种沼气池沼液,每2h搅拌5min,保持37°C厌氧发酵连续运行,直到反应器中发酵液pH由初始的7.0-7.2降低至6.2-6.5并保持恒定,且末端液相发酵产物中乙酸占据主导地位,所述的原料为畜禽粪便或畜禽粪便与农作物秸杆的混合物,保持原料中总C:N为20~30:1,得到产酸发酵产物;
[0018] b)将产酸发酵产物进料至过滤装置中过滤,通过产酸发酵相反应器出料口与过滤装置进料口的高度压差及重力作用实现固液分离,一些不能被微生物降解利用或极难降解利用的秸杆残渣等固形物留在过滤装置中过滤材料以上部分,包含有挥发性有机酸等短链小分子有机物质的液体则进入到过滤装置中过滤材料以下部分;
[0019] c)将过滤后的液体以连续进料的方式栗入到无氧环境的产甲烷相反应器中,接种来自于啤酒厂或城市污水处理厂UASB反应器中的厌氧颗粒污泥,控制产甲烷相反应器回流比为2:1,以达到稀释进水和提高反应器内上升流速、维持颗粒污泥稳定的效果,保持32~35°C厌氧反应连续运行,排气孔排出的沼气收集到集气瓶中。
[0020] 作为优选,所述的过滤装置应定期清理,清理方式为将打开过滤装置顶端盖板清理内部固形物及过滤材料,每次清理后应抽真空以除去过滤装置中的氧气。
[0021] 本发明的有益效果是:两相厌氧发酵装置和工艺的应用,使产酸发酵相微生物和产甲烷相微生物各司其职,提高了整个系统在发酵过程中的处理效率;过滤装置的引进,将一些不能降解或极难降解的纤维类物质及时分离出来,避免了效率低下的降解过程,缓解了由于浮渣的存在而带来的设备或管路堵塞的技术瓶颈,为产甲烷相提供了更好的基质环境;EGSB反应器的应用和颗粒污泥的引进,大幅提升了沼气的产生效率及系统对温度条件的适应范围;本发明的处理对象是农业有机废弃物,在减少环境污染源的同时,产生了可持续利用的能源沼气,对于控制农村面源污染,改善农村生活条件有重大意义,本发明具有显著的社会效益及生态效益。
附图说明
[0022] 图1为本发明示意图。
[0023] 图2为实施例3产酸发酵相反应器pH变化及发酵产物中乙酸占比。
[0024] 图3为实施例3产甲烷相反应器进出料的C0D测试曲线图。
[0025] 图4为实施例3中沼气产量及甲烷含量随时间的变化曲线图。
[0026] 图1中:1_产酸发酵相反应器;2_进料口 ;3_出料口 ;4_排气孔;5_叶片搅拌器;6_取样口 ;7_集气瓶;8_气体流量计;9_产甲烷相反应器;10_反应区;11_沉淀区;12_进料口 ; 13-布水器;14-排气孔;15-出料口 ; 16-温感探头;17-氧化还原电位探头;18_回流管;19_回流管出水口 ;20_三相分离器;21_出水管;22_过滤装置;23_过滤材料;24_进料口;25-出料口 ;26-蠕动栗。
具体实施方式
[0027] 附图非限制性地公开了本发明实施例的基本结构,下面结合实施例及附图,对本发明作进一步地详细说明,但本发明的实施方式不限于此。
[0028] 实施例1:农业有机废弃物厌氧发酵回收沼气反应装置,包括产酸发酵相反应器
1、产甲烷相反应器9,在产酸发酵相反应器1与产甲烷相反应器9的连接管道上设置有过滤装置22,所述过滤装置22包括圆锥型壳体,壳体内腔内设置有过滤材料23,壳体顶端设置有可开启或密封的盖板,壳体上下两端开设有进料口 24以及出料口 25,进料口 24的水平位置低于产酸发酵相反应器1的出料口 3。所述过滤装置22进料口 24的水平位置低于产酸发酵相反应器1出料口 3的距离为产酸发酵相反应器1总高度的2/3。所述过滤材料为尼龙滤网或聚乙烯滤网,滤网孔径大小为0.5_~3_,其位置位于过滤装置22总高度的1/2处。产酸发酵相反应器1为连续搅拌爸式反应器,包括壳体,壳体底部的进料口 2、壳体一侧近上端的出料口 3,壳体顶端设置有排气孔4,壳体内部设置有叶片搅拌器5。产甲烷相反应器9为厌氧膨胀颗粒污泥床反应器,包括壳体,壳体内腔分为反应区10和沉淀区11,进料口12位于反应区10底部壳体上,进料口 12上方、反应区10内部设有布水器13,排气孔14位于壳体顶端,出料口 15位于壳体顶盖下方,反应区壳体侧面设有温感探头16和氧化还原电位探头17,沉淀区壳体上设置有回流出水口 19,出水口 19设置有回流管道18连接进料口连接实现内部回流。回流出水口 19位于反应器沉淀区11总高度的1/3~1/2处。过滤装置出料口 25与产甲烷相反应器9的进料口 12连接管道上设置有蠕动栗26。所述的产甲烷相反应器9反应区10的高径比为9:1~10:1。产酸发酵相反应器1、过滤装置22、产甲烷相反应器9总体积比为2.5-3.5:1:1。
[0029] 实施例2:参照实施例1,所述的过滤装置22进料口 24的水平位置低于产酸发酵相反应器1出料口 3的距离与产酸发酵相反应器1总高度相等,为25cm。
[0030] 所述的过滤材料23材质的选择为尼龙滤网,滤网孔径大小为2mm,其位置位于过滤装置22总高度的1/2处。所述的产甲烷相反应器9反应区10的高为650mm,内径为70mm,高径比为9.3:1。所述的产酸发酵相反应器1、过滤装置22、产甲烷相反应器9总体积分别为15L、5L、5L,总体积比为3:1:1。
[0031] 实施例3:农业有机废弃物厌氧发酵回收沼气反应装置回收方法,包括以下步骤:
[0032] a)原料经预处理后,以总固形物浓度为12%投加到经过预先抽真空除氧的产酸发酵相反应器中,并向反应器中接种沼气池沼液,每2h搅拌5min,保持37°C厌氧发酵连续运行,直到反应器中发酵液pH由初始的7.0-7.2降低至6.2-6.5并保持恒定,且末端液相发酵产物中乙酸占据主导地位,所述的原料为畜禽粪便或畜禽粪便与农作物秸杆的混合物,保持原料中总C:N为20~30:1,得到产酸发酵产物;
[0033] b)将产酸发酵产物进料至过滤装置中过滤,通过产酸发酵相反应器出料口与过滤装置进料口的高度压差及重力作用实现固液分离,一些不能被微生物降解利用或极难降解利用的秸杆残渣等固形物留在过滤装置中过滤材料以上部分,包含有挥发性有机酸等短链小分子有机物质的液体则进入到过滤装置中过滤材料以下部分;
[0034] c)将过滤后的液体以连续进料的方式栗入到无氧环境的产甲烷相反应器中,接种来自于啤酒厂或城市污水处理厂UASB反应器中的厌氧颗粒污泥,控制产甲烷相反应器回流比为2:1,以达到稀释进水和提高反应器内上升流速、维持颗粒污泥稳定的效果,保持35°C厌氧反应连续运行,排气孔排出的沼气收集到集气瓶中。所述的过滤装置应定期清理,清理方式为将打开过滤装置顶端盖板清理内部固形物及过滤材料,每次清理后应抽真空以除去过滤装置中的氧气。
[0035] 本实施例中产酸发酵相反应器pH变化及发酵产物中乙酸占比如图2所示。
[0036] 本实施例中产甲烷相反应器进出料的C0D测试曲线图如图3所示。
[0037] 本实施例中沼气产量及甲烷含量随时间的变化曲线图如图4所示。
[0038] 上述实施例为本发明较佳的实施方式,但本发明的实施方式并不受所述实施例的限制,其他的任何未背离本发明的精神实质与原理下所作的改变、修饰、替代、组合、简化,均应为等效的置换方式,都包含在本发明的保护范围之内。
Claims (9)
1.农业有机废弃物厌氧发酵回收沼气反应装置,包括产酸发酵相反应器、产甲烷相反应器,其特征在于在产酸发酵相反应器与产甲烷相反应器的连接管道上设置有过滤装置,所述过滤装置包括圆锥型壳体,壳体内腔内设置有过滤材料,壳体顶端设置有可开启或密封的盖板,壳体上下两端开设有进料口以及出料口,进料口的水平位置低于产酸发酵相反应器的出料口,产甲烷相反应器包括壳体,壳体内腔分为反应区和沉淀区,进料口位于反应区底部壳体上,进料口上方、反应区内部设有布水器,排气孔位于壳体顶端,出料口位于壳体顶盖下方,反应区壳体侧面设有温感探头和氧化还原电位探头,沉淀区壳体上设置有回流出水口,出水口设置有回流管道连接进料口,实现内部回流,产酸发酵相反应器包括另一壳体,另一壳体底部的进料口、另一壳体一侧近上端的出料口,另一壳体顶端设置有排气孔,另一壳体内部设置有叶片搅拌器。
2.根据权利要求1所述的农业有机废弃物厌氧发酵回收沼气反应装置,其特征在于所述过滤装置进料口的水平位置低于产酸发酵相反应器出料口的距离至少为产酸发酵相反应器总高度的2/3。
3.根据权利要求1所述的农业有机废弃物厌氧发酵回收沼气反应装置,其特征在于所述过滤材料为尼龙滤网或聚乙烯滤网,滤网孔径大小为0.5_~3_,其位置位于过滤装置总高度的1/2处。
4.根据权利要求1所述的农业有机废弃物厌氧发酵回收沼气反应装置,其特征在于回流出水口位于反应器沉淀区总高度的1/3~1/2处。
5.根据权利要求1所述的农业有机废弃物厌氧发酵回收沼气反应装置,其特征在于过滤装置出料口与产甲烷相反应器的进料口连接管道上设置有蠕动栗。
6.根据权利要求1所述的农业有机废弃物厌氧发酵回收沼气反应装置,其特征在于所述的产甲烷相反应器反应区的高径比为9:1~10:1。
7.根据权利要求1所述的农业有机废弃物厌氧发酵回收沼气反应装置,其特征在于产酸发酵相反应器、过滤装置、产甲烷相反应器总体积比为2.5-3.5:1:1。
8.一种如权利要求1~7之一所述的农业有机废弃物厌氧发酵回收沼气反应装置回收方法,其特征在于包括以下步骤: a)原料经预处理后,以总固形物浓度为8°/『12%投加到经过预先抽真空除氧的产酸发酵相反应器中,并向反应器中接种沼气池沼液,每2h搅拌5min,保持37°C厌氧发酵连续运行,直到反应器中发酵液pH由初始的7.0-7.2降低至6.2-6.5并保持恒定,且末端液相发酵产物中乙酸占据主导地位,所述的原料为畜禽粪便或畜禽粪便与农作物秸杆的混合物,保持原料中总C:N为20~30:1,得到产酸发酵产物; b)将产酸发酵产物进料至过滤装置中过滤,通过产酸发酵相反应器出料口与过滤装置进料口的高度压差及重力作用实现固液分离,一些不能被微生物降解利用或极难降解利用的秸杆残渣等固形物留在过滤装置中过滤材料以上部分,包含有挥发性有机酸等短链小分子有机物质的液体则进入到过滤装置中过滤材料以下部分; c)将过滤后的液体以连续进料的方式栗入到无氧环境的产甲烷相反应器中,接种来自于啤酒厂或城市污水处理厂UASB反应器中的厌氧颗粒污泥,控制产甲烷相反应器回流比为2:1,以达到稀释进水和提高反应器内上升流速、维持颗粒污泥稳定的效果,保持32~35°C厌氧反应连续运行,排气孔排出的沼气收集到集气瓶中。
9.一种如权利要求8所述的适用于农业有机废弃物厌氧发酵回收沼气的高效反应装置回收沼气方法,其特征在所述的过滤装置应定期清理,清理方式为将打开过滤装置顶端盖板清理内部固形物及过滤材料,每次清理后应抽真空以除去过滤装置中的氧气。
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