CN103482818B - Cyclic utilization method for azolla biological cleaning biogas slurry - Google Patents

Cyclic utilization method for azolla biological cleaning biogas slurry Download PDF

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Publication number
CN103482818B
CN103482818B CN201310408135.7A CN201310408135A CN103482818B CN 103482818 B CN103482818 B CN 103482818B CN 201310408135 A CN201310408135 A CN 201310408135A CN 103482818 B CN103482818 B CN 103482818B
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China
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natural pond
duckweed
red
red duckweed
liquid
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CN103482818A (en
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陈敏
邓素芳
杨有泉
林永辉
蔡淑芳
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Institute of Agricultural Ecology of Fujian Academy of Agricultural Sciences
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Institute of Agricultural Ecology of Fujian Academy of Agricultural Sciences
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Abstract

The invention relates to a cyclic utilization method for azolla biological cleaning biogas slurry. The cyclic utilization mode is characterized by comprising the following steps of introducing a liquid obtained from solid-liquid separation of excreta of poultry breeding into a fermentation tank so as to generate methane and biogas slurry, preparing concentrated biogas slurry and a filtered liquid from the biogas slurry through a film filtering device, passing the filtered liquid prepared through film filtration through an azolla biological percolation device and an azolla water breeding device, so that the effluent of the azolla water breeding device meets the requirements on up-to-standard emission, and the azolla which grows and breeds in the azolla water breeding device is machined into a poultry feed for poultry breeding. According to the cyclic utilization mode, up-to-standard emission of sewage of large-scale farms is achieved due to adoption of phytoextraction and biologic percolation functions of aquatic azolla, toxicity and harm are prevented, no secondary pollution is caused, and meanwhile land area for digesting and storing the biogas slurry is greatly reduced by 20-120 times.

Description

Red duckweed biopurification natural pond liquid circulation utilization method
Technical field
The present invention relates to a kind of red duckweed biopurification natural pond liquid circulation utilization method.
Background technology
The livestock breeding wastewater of livestock and poultry farm discharge, by GB/T 50363-2006 standard regulation, the natural pond liquid that need produce through biogas engineering fermentation, could be used for also field after harmless treatment.Forbid to be mixed into other poisonous, harmful sewage or mud.Excrement without the abundant fermentative processing of biogas engineering is dirty, should not adopt pipeline also field.But the natural pond liquid measure that biogas engineering fermentation produces is very large, dissolves in the field that space required is enough large.To dissolve safely quantity according to different crops measuring and calculating natural pond liquid.1 mu of herbary excrement that livestock on hand live pig 1-2 head produces of dissolving is dirty, and other crops according to being no more than maximum fertilizer requirement, should calculate design cultivation scale and the cultivated area for dissolving.To plant and the culture zone with different livestock and poultry kind, the cultivation amount of chicken, ox can be converted into the cultivation amount of pig by its scale, and concrete conversion scale is pressed GB 18596-2001 and performed.
Generally, 1 ten thousand pig farm will have the farmland of more than 5000 mu areas just to dissolve the natural pond liquid produced continually.If farmland area and methane-generating pit scale do not match, natural pond liquid just must be transported outward.Because current biogas follow-up service system is unsound, biogas service organizations is less in addition, and the natural pond liquid that biogas engineering is produced cannot realize outward transport.On the one hand, biogas owner is reluctant to bear voluntarily all charges of natural pond liquid transport; On the other hand, the auxiliary facility that natural pond liquid utilizes comprises field storage pool, equalizing tank, filtration unit, transport pipeline and spray drip irrigation equipment, and peasant household is difficult to fully bear.Therefore, great majority rely on artificial filling to execute present stage.Transport inconvenience, then become natural pond liquid mass-producing and utilize another major obstacle being difficult to improve.
Natural pond liquid application model development obstacles is to need big area soil to the natural pond liquid that biogas engineering of dissolving produces continually.Existing natural pond liquid application model mainly contains pig-natural pond-rice, pig-natural pond-really, pig-natural pond-nursery stock, pig-natural pond-dish, pig-natural pond-herbage etc., no matter the crop of application is paddy rice, watermelon, oranges and tangerines, vegetables, or, all there is identical problem in mao bamboon, tealeaves, nursery stock and herbage etc.Southeast is one of agriculture highly intensive important area of China, and its surrounding ground is limited, populous, and the natural pond liquid of most of biogas engineering cannot be digested and assimilated by soil, causes quite serious secondary pollution to environment.
Summary of the invention
The present invention improves the problems referred to above; namely the technical problem to be solved in the present invention is to provide one and realizes scale livestock farming sewage qualified discharge; nontoxic, harmless, any secondary pollution can not be produced, significantly can reduce the natural pond liquid circulation utilization method of land area needed for the liquid of natural pond of dissolving simultaneously.
Specific embodiment of the invention scheme is: a kind of red duckweed biopurification natural pond liquid circulation utilization method, comprises the following steps:
(1) liquid after the movement solid-liquid separation formed by livestock and poultry cultivation imports in fermentor tank and forms biogas and natural pond liquid;
(2) natural pond liquid is formed concentrated natural pond liquid and filtered liquid by membrane filter appts;
(3) filtered liquid that step (2) is formed is flowed through successively the biological percolating device of red duckweed and red duckweed water supports device, the water outlet making red duckweed water support device meets the requirement of qualified discharge;
(4) the red duckweed that step (3) growth and breeding goes out is processed into animal and fowl fodder supply livestock and poultry cultivation.
Further, the biological percolating device of described red duckweed is made up of bacteria bed, filtering layer filtrate and water circulation system, and described filtering layer filtrate is extra dry red wine duckweed, and described extra dry red wine duckweed pack is placed in bacteria bed.
Further, described red duckweed water supports device is outdoor outdoor cultivation.
Further, it is warmhouse booth cultivation that described red duckweed water supports device, and be provided with multilayer culturing pool in booth, filtered liquid recycles as red duckweed nutrient solution, can discharge until water body meets qualified discharge requirement.
Further, livestock and poultry cultivation formed movement solid-liquid separation after solid be processed to form fertilizer.
Further, the biogas formed in described fermentor tank forms the insulation of fuel feed livestock and poultry cultivation room or gas for kitchen use.
Compared with prior art, the present invention has following beneficial effect:
(1) the present invention establishes one " live pig-natural pond liquid-red duckweed " and purifies natural pond liquid circulation utilization method, and red duckweed is a kind of aquatic fern of high fixed nitrogen, and its breeding is fast, output is high, nutritious, protein content is high.Feed, bait can be made, can fertilizer be made again.In addition, red duckweed has certain durability against pollution, by the inrichment of live body and the physisorption of stem body, effectively can remove the nutritive element such as nitrogen, phosphorus in water, absorb and each heavy metal species of enrichment, toxic compounds, increase dissolved oxygen, degraded COD, makes eutrophic water become limpid.Meanwhile, by the red duckweed after decontamination process and effluent cycle recycling, break through the problem that clean dirty biological treatment is difficult.
(2) natural pond liquid is after membrane filter appts, and concentrated solution only accounts for the 5-10% of total filtration yield, can direct marketing to fertilizer factory, because concentrated solution contains the plant nutrient substance of more than 90%, concentration is high, traffic capacity is few, and organic fertilizer production cost declines to a great extent, and remarkable in economical benefits improves.
(3) natural pond liquid is after membrane filter appts, and filtered liquid does not still reach emission standard, needs plant to dissolve.The present invention adopts red duckweed to dissolve technique, red duckweed fast growth, and the strong volume of water purification ability is little, can adopt multi-layer biological cleanup form during purification, can meet under qualified discharge prerequisite, significantly reduces land area needed for the liquid of natural pond of dissolving, can reduce 20 ~ 120 times.
Therefore; in " live pig-natural pond liquid-red duckweed " pattern; red duckweed has superpower plant extraction and the feature of purifying water body; possess degradable organic pollutant and safeguard effect that water body balances; playing active effect to promotion scale animal and poultry cultivation sewage qualified discharge, is the good material of purifying eutrophication water body.On hills, the southeast, the middle and lower reach of Yangtze River and vast southern area apply this pattern, natural pond liquid can be avoided the pollution of surrounding body, carry out permanent improvement, be conducive to the deterioration preventing periphery ecotope from the source producing pollution of area source.
Accompanying drawing explanation
Fig. 1 is the present invention's red duckweed biopurification natural pond liquid circulation utilization method artwork.
embodiment
Below in conjunction with the drawings and specific embodiments, the present invention will be further described in detail.
As shown in Figure 1, a kind of red duckweed biopurification natural pond of the present invention liquid circulation utilization method, comprises the following steps:
(1) liquid after the movement solid-liquid separation formed by livestock and poultry cultivation imports in fermentor tank and forms biogas and natural pond liquid;
(2) natural pond liquid is formed concentrated natural pond liquid and filtered liquid by membrane filter appts;
(3) filtered liquid step (2) formed is successively by the biological percolating device of red duckweed, and red duckweed water supports device filtered liquid to be formed the clear water of qualified discharge;
(4) the red duckweed that step (3) is formed is processed into animal and fowl fodder supply livestock and poultry cultivation.
Solid after the movement solid-liquid separating machine that livestock and poultry cultivation is formed is separated is processed to form fertilizer, and liquid enters fermentation vat and produces biogas and natural pond liquid, and biogas is delivered to farm house as kitchen fuel by a biogas pipeline part, and another part can be used as the heating of cultivation factory.
Come from the natural pond liquid of settling tank first through membrane filter appts, cannot by the direct canned sale of the concentrated solution of film or for processing fertilizer after press filtration; Natural pond liquid is after membrane filter appts, and concentrated solution only accounts for the 5%-10% of total filtration yield, can direct marketing to fertilizer factory, because concentrated solution contains the plant nutrient substance of more than 90%, concentration is high, traffic capacity is few, and organic fertilizer production cost declines to a great extent, and remarkable in economical benefits improves.
Press filtration, by the filtered liquid of film, after flowing through red duckweed percolating device, supports the Cyclic culture liquid of device as red duckweed water.Red duckweed water is supported the red duckweed that device produces and is processed into feed, sow of feeding, and fecund is young, produces good young, or live pig of feeding; And red duckweed water support device discharge be the requirement that clear water can meet qualified discharge, also may be used for the daily flushing of pig house.Such formation red duckweed biopurification efficient circulation Application way.
The biological percolating device of described red duckweed is made up of bacteria bed, filtering layer filtrate and water circulation system, and described filtering layer filtrate is extra dry red wine duckweed, and described extra dry red wine duckweed pack is placed in bacteria bed.It is outdoor outdoor cultivation that described red duckweed water supports device, can also go up warmhouse booth cultivation, is provided with multilayer culturing pool to realize reducing space, is meeting under qualified discharge prerequisite, significantly reducing land area needed for the liquid of natural pond of dissolving, can reduce 20 ~ 120 times in booth.Meanwhile, the present invention adopts red duckweed as the biological percolating device of diafiltration material development, utilizes the plant extraction of the red duckweed of hydrobiont and biological diafiltration function, realizes scale livestock farming sewage qualified discharge, nontoxic, harmless, can not produce any secondary pollution.
The foregoing is only preferred embodiment of the present invention, all equalizations done according to the present patent application the scope of the claims change and modify, and all should belong to covering scope of the present invention.

Claims (6)

1. a red duckweed biopurification natural pond liquid circulation utilization method, is characterized in that, comprise the following steps:
(1) liquid after the movement solid-liquid separation formed by livestock and poultry cultivation imports in fermentor tank and forms biogas and natural pond liquid;
(2) natural pond liquid is formed concentrated natural pond liquid and filtered liquid by membrane filter appts;
(3) filtered liquid that step (2) is formed is flowed through successively the biological percolating device of red duckweed and red duckweed water supports device, the water outlet making red duckweed water support device meets the requirement of qualified discharge;
(4) the red duckweed that step (3) growth and breeding goes out is processed into animal and fowl fodder supply livestock and poultry cultivation.
2. one according to claim 1 red duckweed biopurification natural pond liquid circulation utilization method, it is characterized in that, the biological percolating device of described red duckweed is made up of bacteria bed, filtering layer filtrate and water circulation system, and described filtering layer filtrate is extra dry red wine duckweed, and described extra dry red wine duckweed pack is placed in bacteria bed.
3. one according to claim 1 and 2 red duckweed biopurification natural pond liquid circulation utilization method, is characterized in that, it is outdoor outdoor cultivation that described red duckweed water supports device.
4. one according to claim 1 and 2 red duckweed biopurification natural pond liquid circulation utilization method, it is characterized in that, it is warmhouse booth cultivation that described red duckweed water supports device, multilayer culturing pool is provided with in booth, filtered liquid recycles as red duckweed nutrient solution, can discharge until water body meets qualified discharge requirement.
5. one according to claim 1 red duckweed biopurification natural pond liquid circulation utilization method, is characterized in that, the solid after the movement solid-liquid separation that livestock and poultry cultivation is formed is processed to form fertilizer.
6. one according to claim 1 red duckweed biopurification natural pond liquid circulation utilization method, is characterized in that, the biogas formed in described fermentor tank forms the insulation of fuel feed livestock and poultry cultivation house or gas for kitchen use.
CN201310408135.7A 2013-09-10 2013-09-10 Cyclic utilization method for azolla biological cleaning biogas slurry Expired - Fee Related CN103482818B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103951145B (en) * 2014-01-27 2017-08-15 青岛市畜牧兽医研究所 A kind of dirty harmless treatment of livestock and poultry cultivation excrement and the method recycled
CN109601093A (en) * 2018-12-06 2019-04-12 丽水职业技术学院 A kind of biogas slurry method of administration improving tea-leaf safety

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