CN102276319A

CN102276319A - Method for removing impurities from anaerobic fermentation raw materials in livestock and poultry excrement recycling process

Info

Publication number: CN102276319A
Application number: CN2011101515656A
Authority: CN
Inventors: 张亚雷; 周雪飞; 陈小华; 刘战广; 张娟; 苏鸿洋
Original assignee: Tongji University
Current assignee: Tongji University
Priority date: 2011-06-08
Filing date: 2011-06-08
Publication date: 2011-12-14
Anticipated expiration: 2031-06-08
Also published as: CN102276319B

Abstract

The invention relates to a method for removing impurities from anaerobic fermentation raw materials in a livestock and poultry excrement recycling process, which comprises the steps of: regulating livestock and poultry excrements in a mixing pool to reach a fermenting concentration required by the design; stirring fermenting raw materials in the mixing pool uniformly, settling inorganic impurities with large density in the bottom of the mixing pool in a stirring process; arranging a sand collecting hopper at the bottom of the mixing pool; after finishing feeding, scraping the inorganic impurities into the sand collecting hopper by a sand scarping machine, conveying scrapped inorganic impurities to a drying bed through a spiral conveyer; feeding uniformly-mixed feed liquid into a vibrating screen through an underflow pump for screening, discharging the impurities which are easy to cause pipeline blockage and form scummings in a fermenting pool on a fixed screen; feeding the feed liquid screened by the vibrating screen and the sewage filtered by the fixed screen into a feeding pool, feeding into the fermenting pool through a feeding pump; and arranging a cyclone sand remover on a pipeline through which the feed liquid and the sewage enter the fermenting pool, and further removing the inorganic impurities in the feed liquid. According to the invention, the problems of abrasion and blockage of equipment and the pipeline, caused by the impurities in the livestock and poultry excrements, difficulty in bottom deslagging after the feed liquid enters the fermenting pool, and easiness in forming scummings at the top are solved, and operation management level and recycling efficiency of the livestock and poultry excrement recycling treatment project are improved.

Description

A kind of livestock and poultry feces recycling treatment engineering anaerobic fermentation raw material impurity-removing method

Technical field

The invention belongs to the resource and environment technical field, be specifically related to a kind of livestock and poultry feces recycling treatment engineering anaerobic fermentation raw material impurity-removing method.

Background technology

China is world population first big country, also is aquaculture first big country.The state-owned large-scale cultivation field pig that surpasses more than 10,000 is delivered for sale more than 3000 at present, laying hen livestock on hand 50,000 plumages are above, fryer delivers that 100,000 plumages are above for sale, milk cow livestock on hand more than 200, beef cattle are delivered for sale more than 500.Ight soil and sewage that plant's discharging is a large amount of as without effective processing, will cause great harm to environment.Because the organic content height of feces of farm, not only infrastructure investment is big but also running cost is high by aerobic treatment, can't promote down.And by anaerobic treatment, both can remove a large amount of organism, can also kill various viruses in the excrement dirt etc.The biogas that produces in the anaerobic fermentation process is high-quality new forms of energy, and it both can be used for resident's daily cooking by central gas supply, can also carry out marsh gas power generation, and natural pond liquid behind the excrement soiled ends anaerobically fermenting and natural pond slag are good fertilizers.Therefore, anaerobically fermenting processing livestock and poultry feces is a kind of economy, environmental protection, ecology and feasible implementation method.

In recent years, along with attention to environmental problem, at the dirty problem of the excrement of large-scale cultivation field, thousands of livestock and poultry feces recycling treatment engineering that China is newly-built.Yet, containing inorganic impurity such as a large amount of sand and pig hair, chicken feather, straw etc. easily form scum silica frost in fermentation vat impurity in the livestock and poultry feces, management has brought a series of problems to engineering operation:

A large amount of inorganic impurities that 1 livestock and poultry feces contains, easily wearing and tearing fresh feed pump and feed pipe when charging enter behind the fermentation vat easily equipment such as wearing and tearing stirrer.Simultaneously, the flowability of inorganic impurity is poor, is difficult to behind the long-play discharge and is accumulated at the bottom of the fermentation vat, reduces the effective volume of fermentation vat, reduces fermentation efficiency.

Contain impurity such as pig hair, chicken feather, straw in 2 livestock and poultry feces, when adopting common submersible sewage pump charging, these impurity stop up fresh feed pump and feed pipe easily.Existing livestock and poultry feces recycling treatment engineering all enters into fermentation vat by spiral pump after adopting the cutting machine chopping mostly, the equipment complexity, and cost is higher.

Impurity such as 3 pig hairs, chicken feather, straw are because scum silica frost is formed on the little fermentation vat top that swims in easily of density, and obstruction biogas overflows and causes fermentation vat pressure excessive, even sets off an explosion.Simultaneously, scum silica frost is difficult to clear from fermentation vat.

The anaerobic fermentation raw material removal of impurities can fundamentally address these problems, but does not also have at present a kind of system, comprehensively remove the method for the impurity in the livestock and poultry feces recycling treatment engineering anaerobic fermentation raw material.

Summary of the invention

The objective of the invention is according to the demand of livestock and poultry feces recycling treatment and the characteristics of fermentation raw material, a kind of solution equipment attrition, line clogging are proposed, and the easy livestock and poultry feces recycling treatment engineering anaerobic fermentation raw material impurity-removing method of problem such as formation scum silica frost in fermentation vat deslagging difficulty and the fermentation vat.

A kind of livestock and poultry feces recycling treatment engineering anaerobic fermentation raw material impurity-removing method that the present invention proposes, concrete steps are as follows:

1. fermentation raw material 1 enters into batch mixing pond 2, and according to production engineering specifications, the natural pond liquid of 0 ~ 3 times of backflow raw material volume is in batch mixing pond 2 from natural pond liquid storage pool 17;

2. utilize the stirrer 3 in the batch mixing pond 2 that the fermentation raw material 1 and the natural pond liquid of step in is 1. mixed, mixing time is 0.25 ~ 1h;

3. the big inorganic impurity 4 of density sinks to the bottom in batch mixing pond 2 in the step feed liquid 2. in whipping process, scrapes the sand collecting hopper 5 of 2 bottoms, batch mixing pond by the machine of strike-ofing 6, is transported to drying bed 8 by worm conveyor 7;

4. the feed liquid of step in 2. enters vibratory screening apparatus 10 by underflow pump 9 and sieves, and impurity 11 screenings that easily form scum silica frost in fermentation vat come out, and be discharged in the stationary screen 12, further leaches moisture;

5. the sewage that leaches through the feed liquid and the stationary screen 12 of vibratory screening apparatus 10 screening in 4. of step enters charging pond 13, enters fermentation vat 16 by fresh feed pump 14 then.

6. step in 5. fresh feed pump 14 and the pipeline before the fermentation vat on hydrocyclone 15 is set, further remove the inorganic impurity 4 in the feed liquid.

Beneficial effect of the present invention:

When 1 anaerobic fermentation raw material concentration is high, utilize natural pond liquid batch mixing to regulate material concentration, can reduce the quantity discharged of natural pond liquid, alleviate the pressure that follow-up natural pond liquid utilizes.

The inorganic impurity that density is big in 2 fermentation raw materials adopts mechanical stirring in the batch mixing pond, precipitate in a large number owing to the difference of density.Tiny inorganic impurity adopts hydrocyclone further to remove before entering fermentation vat in the feed liquid.Secondary impurity-removing method equipment of the present invention is simple, easy handling, dust removal rate height, can remove the inorganic impurity more than 90%, has reduced equipment and pipe wear.

3 vibratory screening apparatuss can sieve out with impurity such as the pig hair more than 80%, chicken feather, straw in the fermentation raw material.Feed liquid after the screening can adopt common submersible sewage pump charging, not only avoided fresh feed pump and feed pipe to stop up, and equipment is simple, cost is low, and operational management is convenient.

The inorganic impurity that density is big in 4 fermentation raw materials enters fermentation vat, easily is accumulated at the bottom of the fermentation vat, is difficult to discharge; Impurity such as pig hair, chicken feather, straw easily form scum silica frost at the fermentation vat top, obstruction biogas overflows and causes fermentation vat pressure excessive, even sets off an explosion.The impurity-removing method that the present invention adopts can effectively be removed above-mentioned impurity, has stopped above problem.

Description of drawings

Fig. 1 is a livestock and poultry feces recycling treatment engineering anaerobic fermentation raw material impurity-removing method process flow sheet.

Number in the figure: 1 is fermentation raw material, and 2 is the batch mixing pond, and 3 is stirrer, 4 is inorganic impurity, and 5 is sand collecting hopper, and 6 are the machine of strike-ofing, 7 is worm conveyor, and 8 is drying bed, and 9 is underflow pump, 10 is vibratory screening apparatus, and 11 is the impurity that easily forms scum silica frost in fermentation vat, and 12 is stationary screen, 13 are the charging pond, and 14 is fresh feed pump, and 15 is hydrocyclone, 16 is fermentation vat, and 17 is natural pond liquid storage pool.

Embodiment

Be that example illustrates the present invention with a mass-producing breeding layer chicken field chicken manure recycling treatment engineering below.

Embodiment 1

The concrete technical process of present method is: fermentation raw material 1 enters into batch mixing pond 2, and according to production engineering specifications, the natural pond liquid of 0 ~ 3 times of backflow raw material volume is in batch mixing pond 2 from natural pond liquid storage pool 17; Utilize the stirrer 3 in the batch mixing pond 2 that fermentation raw material and natural pond liquid are mixed then, mixing time is 0.25 ~ 1h; The inorganic impurity 4 that density is big sinks in whipping process at the bottom of the pond, and inorganic impurity 4 scrapes sand collecting hopper 5 at the bottom of 2 ponds, batch mixing pond by the machine of strike-ofing 6, is transported to drying bed 8 by worm conveyor 7; Feed liquid is all extracted out from batch mixing pond 2, and the feed liquid that mixes enters vibratory screening apparatus 10 by underflow pump 9.Vibratory screening apparatus 10 will easily form impurity 11 screenings of scum silica frost and come out in fermentation vat, and will be discharged in the stationary screen 12, further leach moisture; The sewage that the feed liquid of vibratory screening apparatus 10 screenings and stationary screen 12 leach enters charging pond 13, enters fermentation vat 16 by fresh feed pump 14 then.Hydrocyclone 15 is set on the pipeline before entering fermentation vat, further removes the inorganic impurity 4 in the feed liquid.

Aforesaid method is used to be positioned at certain Greater plant, and the breed scale is 100,000 plumage laying hens.For solving the chicken manure problem, have comprehensive chicken manure recycling treatment engineering, concrete steps are as follows:

1, the chicken manure that produces every day is that solids content is about 25% about 10t, is transported to by conveying belt in the batch mixing pond 2 of 30m3.When carrying the natural pond liquid in the natural pond liquid storage pool 17 is discharged in the batch mixing pond 2, it is 10% that the natural pond liquid of backflow 15m3 is regulated material concentration.

2, the stirrer 3 in the batch mixing pond 2 is with natural pond liquid and chicken manure thorough mixing, and mixing time is 0.5h.In mixing process, inorganic impurities 4 such as the sand in the chicken manure, shell sink to greatly at the bottom of 2 ponds, batch mixing pond owing to density.

3, after the feed liquid for the treatment of batch mixing pond 2 was all extracted out, the inorganic impurity 4 of the machine 6 of strike-ofing at the bottom of with 2 ponds, batch mixing pond scraped in the sand collecting hopper 5, and worm conveyor 7 is discharged to inorganic impurities such as sand the drying bed 8 at the bottom of 2 ponds, batch mixing pond.

4, the feed liquid that mixes is sent in the high frequency shale shaker 10 that is the scarp by the underflow pump 9 that has cutting unit, and impurity such as chicken feather are sized out, is discharged to then in the stationary screen 12, further removes moisture.

5, Shai Fen feed liquid and sewage enter into charging pond 13 together, and fresh feed pump 14 is equipped with in 13 bottoms, charging pond.

6, fresh feed pump 14 is pumped into feed liquid in the fermentation vat 16, and hydrocyclone 15 is housed on the pipeline before entering fermentation vat 16, carries out the secondary desanding.

7, through after the top a series of operation, sand in the fermentation raw material more than 90%, shell and the impurity such as chicken feather more than 90% are removed in the different stages respectively, the equipment attrition that effective solution sand and shell bring, the line clogging that chicken feather brings, and the scum problem in fermentation vat deslagging difficulty and the fermentation vat, for solid basis has been established in the steady running and the maintenance management of biogas engineering.

Claims

1. livestock and poultry feces recycling treatment engineering anaerobic fermentation raw material impurity-removing method is characterized in that concrete steps are as follows:

1. fermentation raw material (1) enters into batch mixing pond (2), and according to production engineering specifications, the natural pond liquid of 0 ~ 3 times of backflow raw material volume is in batch mixing pond (2) from natural pond liquid storage pool (17);

2. utilize the stirrer (3) in the batch mixing pond (2) that the fermentation raw material (1) and the natural pond liquid of step in is 1. mixed, mixing time is 0.25 ~ 1h;

3. the inorganic impurity (4) that density is big in the step feed liquid 2. sinks to the bottom of batch mixing pond (2) in whipping process, scrapes the sand collecting hopper (5) of batch mixing pond (2) bottom by the machine of strike-ofing (6), is transported to drying bed (8) by worm conveyor (7);

4. the feed liquid of step in 2. enters vibratory screening apparatus (10) by underflow pump (9) and sieves, and impurity (11) screening that easily forms scum silica frost in fermentation vat come out, and be discharged in the stationary screen (12), further leaches moisture;

5. the sewage that leaches through the feed liquid and the stationary screen (12) of vibratory screening apparatus (10) screening in 4. of step enters charging pond (13), enters fermentation vat (16) by fresh feed pump (14) then;

6. step in 5. fresh feed pump (14) and the pipeline before the fermentation vat on hydrocyclone (15) is set, further remove the inorganic impurity (4) in the feed liquid.