Livestock and poultry manure burden reducing treatment method

Abstract

The invention discloses a load-reducing treatment method for livestock and poultry manure. The treatment method comprises the following operation steps: step 1, deslagging the livestock and poultry manure through a mechanical grid, and then conveying the livestock and poultry manure to a manure collecting tank; step 2, on the basis of the step 1, performing multi-stage solid-liquid separation on the livestock and poultry manure to obtain separated liquid and dry manure, feeding part of biogas manure obtained after anaerobic reaction of the separated liquid into a biochemical pond / anoxic-aerobic tank for aeration biochemical treatment, and feeding part of biogas manure into a prepared fertilizer temporary storage tank; 3, on the basis of the step 2, feeding the fertilizer water with the reduced concentration of the biogas fertilizer into a fertilizer preparation temporary storage pool; 4, the manure concentration is adjusted according to different growth stages of the planted crops, biogas manure obtained after anaerobic reaction can be used as base fertilizer, the returning pressure is reduced, and meanwhile the application amount of chemical fertilizer is reduced. Compared with the prior art, the method has the advantages that through aeration anoxic and aerobic biochemical reaction, the sewage treatment cost can be effectively reduced, the irrigation safety is guaranteed, the treatment cost and the odor of biogas manure returning to the field are reduced, and the planting safety is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of livestock and poultry manure treatment, and in particular to a method for reducing the burden of livestock and poultry manure treatment. Background Art

[0002] The existing livestock and poultry manure treatment methods only have one-stage solid-liquid separation, and the effluent still contains a large amount of fine manure and suspended matter, which are not easy to be discharged after being brought into the black film biogas digester. Over time, the volume is reduced, the sewage retention time is shortened, and the removal rate is reduced. It is brought into flotation or coagulation sedimentation, resulting in an increase in the amount of medicine used, and the disposal of the medicated sludge is difficult and costly.

[0003] The anaerobic reaction effluent carries a lot of fine slag into the temporary storage tank, which causes the temporary storage tank capacity to decay over time, increasing the difficulty and cost of cleaning;

[0004] The effluent from anaerobic reactions is only temporarily stored. There is no oxygen-deficient aerobic biochemical reaction, so it has a strong odor. Returning manure to the fields carries the risk of environmental complaints. The concentration of manure returned to the fields is high and it is easy to burn the seedlings. At the same time, the supporting land area for returning manure to the fields is large, which increases production costs.

[0005] Sludge dewatering was originally done using a screw press or filter press, which requires the use of the chemical agent PAM (polyacrylamide). This makes the separated dry manure difficult to dry and also affects the fermentation process of the dry manure. It is easy to cause soil compaction after returning it to the field. The cost of entrusting a third party to dispose of it is high, which increases production costs. Summary of the invention

[0006] The technical problem to be solved by the present invention is to overcome the above technical defects.

[0007] In order to solve the above problems, the technical solution of the present invention is: a method for reducing the burden of livestock and poultry manure, the method comprising the following steps:

[0008] Step 1: The livestock and poultry manure is transported to the manure collection pool after the slag is removed by the mechanical grille;

[0009] Step 2: Based on step 1, livestock and poultry manure is subjected to multi-stage solid-liquid separation to obtain separated liquid and dry manure. After anaerobic reaction of the separated liquid, part of the biogas fertilizer is sent to the biochemical pond / anoxic aerobic tank for aeration biochemical treatment, and the other part is sent to the fertilizer temporary storage tank. At the same time, the fertilizer water concentration can be adjusted by controlling the aeration time and the reflux ratio.

[0010] Step 3: Based on step 2, the fertilizer water with reduced concentration is put into the fertilizer storage tank in proportion;

[0011] Step 4: Adjust the concentration of manure according to the different growth stages of the crops. You can directly use the biogas fertilizer after anaerobic reaction as base fertilizer to reduce the pressure of returning to the field and reduce the amount of chemical fertilizer application.

[0012] Furthermore, in step one, the livestock and poultry hair, placenta, afterbirth, and plastic products left behind during the production process in the breeding area are separated by mechanical grilles to separate coarse suspended solids, floating objects and other debris. This can effectively prevent coarse debris from entering and clogging the rear-end structure channels, gates and pipes, and damaging mechanical equipment such as water pumps, thereby reducing the large amount of scum generated by the rear-end processing and ensuring the stable operation of the sewage treatment system.

[0013] Furthermore, in step 2, one-stage, two-stage or multi-stage solid-liquid separation is selected according to the solid content of the manure to remove body hair, larger feed particles and larger feces particles in the livestock and poultry manure, thereby reducing the load of subsequent biochemical treatment and deep treatment and the risk of pump and pipe clogging.

[0014] Furthermore, the mechanical grille adopts a rotary grille machine.

[0015] The advantages of the present invention compared with the prior art are:

[0016] The present invention reduces the amount of suspended matter in feces brought into the post-processing unit by adding multi-stage solid-liquid separation at the front end;

[0017] The present invention adds a biochemical pond / anoxic aerobic pool in the middle, and adjusts the fertilizer water concentration and reduces the odor by controlling the aeration oxygenation biochemical reaction and the reflux ratio, thereby reducing the amount of chemical fertilizers used and ensuring the safety of returning manure to the fields, and reducing the land area required for returning manure to the fields. The two fertilizer temporary storage pools can be used to mix different concentrations according to different crops, different growing seasons, or as base fertilizer or topdressing in the growing season, and the operation is flexible.

[0018] The effluent of the biochemical pond / anoxic aerobic pool of the present invention is supplemented with a sedimentation tank, and the suspended solids, total phosphorus, etc. in the effluent are reduced through natural sedimentation by gravity.

[0019] The present invention provides a high-frequency vibration solid-liquid separator at the end to perform solid-liquid separation and dehydration on the sludge residue in the sludge pool, and adopts physical filtration to avoid the generation of medicated sludge, reduce the cost of sludge disposal, and ensure planting safety.

[0020] High-frequency vibration solid-liquid separator can also be used as the second-stage solid-liquid separation to reduce the solid content of wastewater entering the anaerobic reaction. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The present invention is a flow chart of a method for reducing the burden of livestock and poultry manure. DETAILED DESCRIPTION

[0022] The specific implementation of the present invention is further described below in conjunction with the accompanying drawings, wherein the same components are represented by the same reference numerals.

[0023] It should be noted that the words "front", "rear", "left", "right", "up" and "down" used in the following description refer to directions in the drawings, and the words "inside" and "outside" refer to directions toward or away from the geometric center of a specific component, respectively.

[0024] In order to make the contents of the present invention more clearly understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0025] like Figure 1 As shown, a method for reducing the burden of livestock and poultry manure and waste is provided, and the method comprises the following steps:

[0026] Step 1: The livestock and poultry manure is transported to the manure collection pool after the slag is removed by the mechanical grille;

[0027] Step 2: Based on step 1, livestock and poultry manure is subjected to multi-stage solid-liquid separation to obtain separated liquid and dry manure. After anaerobic reaction of the separated liquid, part of the biogas fertilizer is sent to the biochemical pond / anoxic aerobic tank for aeration and biochemical treatment, and the other part is sent to the fertilizer temporary storage tank. At the same time, the biochemical pond / anoxic aerobic tank can adjust the fertilizer water concentration by controlling the aeration time, reflux ratio, etc.

[0028] Step 3: Based on step 2, the fertilizer water with reduced concentration is put into the fertilizer storage tank in proportion;

[0029] Step 4: Adjust the concentration of fertilizer and water according to the different growth stages of the crops. The base fertilizer can be the biogas fertilizer after anaerobic reaction to reduce the pressure of returning to the field and the amount of chemical fertilizer applied.

[0030] In step one, animal hair, placenta, afterbirth, and plastic products left behind during livestock and poultry breeding are separated by mechanical grilles to separate coarse suspended solids, floating objects and other debris. This can effectively prevent coarse debris from entering and clogging the rear-end structure channels, gates and pipes, and damaging mechanical equipment such as water pumps. It can also reduce the large amount of scum generated by rear-end processing and ensure the stable operation of the sewage treatment system.

[0031] In step two, one-stage, two-stage or multi-stage solid-liquid separation is selected according to the solid content of the manure to remove body hair, larger feed particles and larger feces particles in the livestock and poultry manure, thereby reducing the load of subsequent biochemical treatment and deep treatment and the risk of pump and pipe clogging.

[0032] The mechanical grille adopts a rotary grille machine.

[0033] In specific use, mechanical screens are first used to separate coarse suspended matter, floating objects and other debris such as hair, placenta, afterbirth and plastic products left behind during livestock and poultry breeding. This can effectively prevent coarse debris from entering and clogging the rear-end structure channels, gates and pipes, and damaging mechanical equipment such as water pumps. It can also reduce the large amount of scum generated by the rear-end processing and ensure the stable operation of the sewage treatment system.

[0034] Secondly, mechanical or hydraulic mixing is used to mix the sewage in the collection tank to prevent feces in the sewage from settling at the bottom of the tank, causing sediment to accumulate and compact, making it impossible to lift it to the subsequent solid-liquid separator for effective separation; at the same time, it can even out the water quality and reduce fluctuations in water quality and water volume.

[0035] Solid-liquid separation uses one-stage, two-stage or multi-stage solid-liquid separation according to the solid content of the manure to remove body hair, larger feed particles and larger feces particles in livestock and poultry manure, thereby reducing the load of subsequent biochemical treatment and deep treatment and the risk of pump and pipe clogging.

[0036] This includes the first-level solid-liquid separation: a water-cut wedge-shaped solid-liquid separator is used, the filter screen gap is 0.4-0.5mm, and the water content of the manure is 65-70%. A water level monitoring instrument is set up, which automatically starts at high water level and stops at low water level. It filters, compresses, washes the net in the middle, and automatically washes the net when it stops. The solid content of the sewage after solid-liquid separation is no more than 3%.

[0037] Secondary solid-liquid separation: On the basis of primary solid-liquid separation, fine feces and sewage particles are separated again. A drum-type water-cut wedge-shaped solid-liquid separator (also called a "microfilter") is selected, with a filter screen gap of 0.2-0.25mm and a feces moisture content of 65-70%. The separation efficiency is high and the separation effect is good. Whether a tertiary solid-liquid separation or a multi-stage solid-liquid separation is needed can be considered comprehensively according to the effluent treatment requirements and the content of suspended matter.

[0038] Double-layer solid-liquid separator: It can replace the first-stage (water-cut wedge-shaped solid-liquid separator) and the second-stage (drum solid-liquid separator or microfiltration machine) solid-liquid separation. The upper (first-stage) screen uses 30-40 mesh, and the lower (secondary) screen uses 60-80 mesh. The moisture content of the feces separated from the lower layer is between 85% and 95%; the moisture content of the feces squeezed and dehydrated by the feces squeezer is 65-75%.

[0039] Primary sedimentation tank: After solid-liquid separation, the sewage still contains a certain concentration of particulate matter. A vertical flow sedimentation tank is used to reduce the floor space to achieve the purpose of gravity sedimentation and further remove suspended matter, total phosphorus, etc. A sludge bucket is set at the bottom of the primary sedimentation tank to allow the sludge to settle in the sludge bucket and be pumped to the sludge tank by a sludge pump.

[0040] Anaerobic reaction: (1) The black film biogas digester is used for anaerobic fermentation, which has the advantages of simple construction, short construction period, low cost, simple process, convenient operation and maintenance, long sewage retention time, full digestion, and the ability to use geothermal heating and insulation, so that organic pollutants can be fully fermented and decomposed and produce biogas as a by-product.

[0041] (2) The tank-type anaerobic reactor is suitable for the treatment of high-concentration organic wastewater, has a high organic pollutant removal rate, and can adapt to larger load shocks.

[0042] Secondary sedimentation tank: Reduce the SS of subsequent process sections, so that subsequent process sections have better treatment effects.

[0043] Biochemical pond (anoxic and aerobic pond): The effluent from the secondary sedimentation tank is treated with anoxic and aerobic aeration biochemical treatment to further reduce the concentration of biogas fertilizer and the pressure of returning to the field; at the same time, the concentration of fertilizer water can be flexibly adjusted by controlling the aeration time and the return ratio;

[0044] Final sedimentation tank: separates the bacterial cells and dead suspended matter produced after treatment in the biochemical pond, returns the precipitated activated sludge to the front-end biochemical pond for inoculation, controls the sludge concentration, and regularly discharges the remaining sludge to the sludge pool to achieve the purpose of removing phosphorus and reducing suspended matter.

[0045] Fertilizer storage pool: Fertilizer water treated in biochemical pond / anoxic aerobic pond and precipitated in final sedimentation tank is mixed with biogas manure from anaerobic reaction in different proportions and used as irrigation or fertilization water for crops at different growth stages. Organic matter in sewage is treated by the joint action of microorganisms, bacteria and algae grown in the pond, while nitrogen and phosphorus are removed. Manure mixed with fertilizer water and biogas manure is returned to the fields, which can effectively reduce sewage treatment costs, reduce the odor of biogas manure returned to the fields, reduce the area of ​​land for matching return to the fields, and can reduce or even replace the application of chemical fertilizers.

[0046] Sludge tank: collect the sludge discharged from the primary sedimentation tank, secondary sedimentation tank, final sedimentation tank and anaerobic reaction, and pump it into the high-frequency vibration solid-liquid separator after stirring evenly.

[0047] High-frequency vibration solid-liquid separator: The first layer of filter screen uses 80-120 mesh, and the second layer of filter screen uses 180-300 mesh. The slag has a moisture content of 65-75% after being dehydrated by the auger, and the effluent returns to the primary sedimentation tank for anaerobic reaction treatment. The slag and the dry manure after multi-stage solid-liquid separation are fermented together. The high-frequency vibration solid-liquid separator can also be used as the second stage solid-liquid separation to reduce the solid content of the sewage entering the anaerobic reaction.

[0048] Biogas: After water separation and desulfurization, it is used for production and domestic heating. The surplus is treated by high-altitude combustion through torches. Large-scale farms can centrally collect and purify biomass natural gas or generate electricity.

[0049] The present invention and its embodiments are described above, and such description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it, without departing from the purpose of the invention, they can design a structure and embodiment similar to the technical solution without creativity, which should belong to the protection scope of the present invention.

Claims

1. A method for reducing the burden of livestock and poultry manure, characterized in that: The processing method comprises the following steps: Step 1: The livestock and poultry manure is transported to the manure collection pool after the slag is removed by the mechanical grille; Step 2: Based on step 1, livestock and poultry manure is subjected to multi-stage solid-liquid separation to obtain separated liquid and dry manure. After the separated liquid undergoes anaerobic reaction, part of the biogas fertilizer enters the biochemical pond / anoxic aerobic tank for aeration biochemical treatment, and the other part of the biogas fertilizer enters the fertilizer storage tank. At the same time, the biochemical pond / anoxic aerobic tank can adjust the fertilizer water concentration by controlling the aeration time and the reflux ratio. Step 3: Based on step 2, the fertilizer water with reduced concentration is put into the fertilizer storage tank according to different proportions; Step 4: Adjust the concentration of manure according to the different growth stages of the crops. The base fertilizer can be directly made of biogas fertilizer after anaerobic reaction. It can effectively reduce sewage treatment costs, ensure irrigation safety, reduce the odor of biogas fertilizer returned to the fields, reduce the area of ​​land required for returning biogas fertilizer to the fields, and reduce or even replace the application of chemical fertilizers.

2. A method for reducing the burden of livestock and poultry manure according to claim 1, characterized in that: In step one, mechanical screens are used to separate coarse suspended solids and floating debris from hair, placenta, afterbirth, and plastic products left behind during the production process in the breeding area. This can effectively prevent coarse debris from entering and clogging the channels, gates, and pipes of the rear-end structures, damaging mechanical equipment such as water pumps, and reducing the large amount of scum generated by the rear-end processing, thus ensuring the stable operation of the wastewater treatment system.

3. The method for reducing the burden of livestock and poultry manure according to claim 1, characterized in that: In step two, one-stage, two-stage or multi-stage solid-liquid separation is selected according to the solid content of the manure to remove livestock and poultry hair, larger feed particles and larger feces particles in the manure, thereby reducing the load of subsequent biochemical treatment and deep treatment and the risk of pump and pipe clogging.

4. The method for reducing the burden of livestock and poultry manure according to claim 1, characterized in that: The mechanical grille adopts a rotary grille machine.

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