CN103172217A - Large-scale livestock breeding sewage treatment method and equipment - Google Patents
Large-scale livestock breeding sewage treatment method and equipment Download PDFInfo
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- CN103172217A CN103172217A CN201310060356XA CN201310060356A CN103172217A CN 103172217 A CN103172217 A CN 103172217A CN 201310060356X A CN201310060356X A CN 201310060356XA CN 201310060356 A CN201310060356 A CN 201310060356A CN 103172217 A CN103172217 A CN 103172217A
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Abstract
The invention provides a large-scale livestock breeding sewage treatment method. The large-scale livestock breeding sewage treatment method comprises the following steps of: step a. carrying out physicochemical treatment on livestock breeding sewage by adopting a chemical agent, so that soluble ammonia nitrogen and phosphorus in the livestock breeding sewage form ammonium phosphate crystals, then removing the ammonium phosphate crystals formed in the sewage and suspended organic pollutants together through flocculation; step b. carrying out biochemical treatment on the sewage treated in the step a, and further removing soluble organic pollutants in the sewage; and step c. using a part of treating water treated in the step b as flushing water for colony houses of livestock, thus realizing the cyclic utilization of sewage. The invention also provides large-scale livestock breeding sewage treatment equipment. The large-scale livestock breeding sewage treatment equipment provided by the invention can be used for preventing pollution caused by livestock sewage breeding and realizing recycle processing and cyclic utilization of breeding sewage.
Description
Technical field
The invention belongs to the livestock and poultry cultivation sewage treatment area, be specifically related to a kind of scale animal and poultry cultivation sewage water treatment method and equipment.
Background technology
Along with reform and opening to the outside world and economic development, China's livestock industry has obtained fast development.Built a large amount of livestock and poultry farms in scale at big or middle surrounding city, without the livestock and poultry excrement and urine waste of any processing, flowed directly into river, lake, caused a large amount of nitrogen, phosphorus loss, caused water pollution and eutrophication, natural ecological environment has been damaged.Therefore, strengthening the prevention and cure of pollution of livestock and poultry breeding industry, become present stage and the most important thing of a rural environmental protection job in period from now on, is extremely urgent urgent task.
China improves day by day to the requirement of environment protection in recent years, and no matter for country and local government or enterprise, the pressure of pollution emission reduction increases day by day.And livestock and poultry breeding industry is the pollution industry of current China maximum, will the become China emphasis Pollution abatement in a period from now on and " reduction of discharging " object.
In the livestock and poultry cultivation process, for create good growing environment to livestock and poultry animal, must regularly clean the feces of livestock and poultry accumulated on colony house ground every day, and water rinses the pollutents such as excrement slag remain in colony house ground, and wash-down water is the main source of aquaculture wastewater.Yet what use usually used as the colony house wash-down water is all underground water or tap water, has both caused the waste of water resources, again to the ambient water environment.
The pollutent of aquaculture wastewater not only contains the organism of high density, but also the ammonia nitrogen that contains high density and phosphorus (deliquescent ammonia nitrogen and phosphorus).If after plain sedimentation, supernatant liquor is used as recirculated water, in its working cycle, will certainly produce accumulating of pollution substance, finally can cause the failure of circulation technology.
Therefore, develop scientific and rational livestock and poultry cultivation sewage water treatment method, to reduce Pollution from livestock and poultry, realize that the manipulation of regeneration of livestock and poultry cultivation sewage and recycle become sewage treatment area problem urgently to be resolved hurrily.
Summary of the invention
For the problems referred to above, main purpose of the present invention is to provide a kind of scale animal and poultry cultivation sewage water treatment method and equipment, to reduce Pollution from livestock and poultry, realizes manipulation of regeneration and the recycle of aquaculture wastewater.
For achieving the above object, the invention provides a kind of scale animal and poultry cultivation sewage water treatment method, as shown in Figure 1, described method comprises:
Step a: adopt chemical agent to carry out the physical chemistry processing to livestock and poultry cultivation sewage, make solvability ammonia nitrogen and phosphorus in livestock and poultry cultivation sewage form the ammonium phosphate salt xln, then by flocculation, the ammonium phosphate salt xln and the suspension organic pollutant that in sewage, form are together removed;
Step b: the sewage after step a processes is carried out to biochemical treatment, further remove the solvability organic pollutant in sewage;
Step c: by the part of the processing water after step b processes as the recycle of livestock and poultry colony house wash-down water.
Further, in described step a, adopt chemical agent to carry out the physical chemistry processing to livestock and poultry cultivation sewage, specifically comprise: in livestock and poultry cultivation sewage, add magnesium salts and phosphoric acid salt, regulating the pH value is 8-10, preferably adopt NaOH solution to regulate the pH value, make solvability ammonia nitrogen and phosphorus in livestock and poultry cultivation sewage form ammoniomagnesium phosphate crystal body, the preferred MgCl of described magnesium salts
26H
2o and MgSO
4.7H
2o, the preferred Na of described phosphoric acid salt
3pO
412H
2o and Na
2hPO
412H
2o.
Preferably, in described chemical agent, magnesium salts and phosphatic dosage are to make the Mg in sewage after adding described chemical agent
2+, NH
4 +and PO
4 3-mol ratio be (1-1.5): (1-1.3): 1.
Preferably, in described step a, adopt flocculation agent, preferred aluminium salt, more preferably poly aluminium chloride is flocculated to ammonium phosphate salt xln and the suspension organic pollutant formed in sewage.
Preferably, in described step a, before the employing chemical agent carries out the physical chemistry processing to livestock and poultry cultivation sewage, adopt device for trapping, preferably grid is held back the macrobead bits in livestock and poultry cultivation sewage, held back macrobead bits is mixed with feces of livestock and poultry, to produce fertilizer.
Preferably, in described step b, by aerobe, sewage is carried out to biochemical treatment, further remove the dissolved organic matter in sewage, the sewage after making to process reaches the secondary standard in the urban wastewater treatment firm pollutant emission standard.
Preferably, in described step c, by the 60%-80% of the processing water after step b processes, preferably 70% as the recycle of livestock and poultry colony house wash-down water, and remaining processing water can directly discharge or for irrigated farmland;
Preferably, respectively the mud after step b and step a processing is concentrated, and, through processed, preferably after filter-press dehydration is processed, be transported to compositing system, mixed with feces of livestock and poultry, to produce fertilizer.
The present invention further provides a kind of scale animal and poultry cultivation sewage disposal device, as shown in Figure 2, described equipment comprises: physical chemistry treatment unit, biochemical treatment apparatus and discharge equipment, wherein:
Described physical chemistry treatment unit is set to adopt chemical agent to carry out the physical chemistry processing to livestock and poultry cultivation sewage, make solvability ammonia nitrogen and phosphorus in livestock and poultry cultivation sewage form the ammonium phosphate salt xln, then by flocculation, the ammonium phosphate salt xln and the suspension organic pollutant that form in sewage are together removed, and the sewage after flocculation treatment is transported to described biochemical treatment apparatus;
Described biochemical treatment apparatus is set to the sewage after described physical chemistry treatment unit is processed is carried out to biochemical treatment, further removes the solvability organic pollutant in sewage, and will be through the processing water transport of biochemical treatment to described discharge equipment;
Described discharge equipment is set to using the part of the processing water after described biochemical treatment apparatus is processed as the recycle of livestock and poultry colony house wash-down water.
Wherein, described physical chemistry treatment unit employing chemical agent carries out the physical chemistry processing to livestock and poultry cultivation sewage and specifically comprises: in livestock and poultry cultivation sewage, add magnesium salts and phosphoric acid salt, regulating the pH value is 8-10, preferably adopt NaOH solution to regulate the pH value, make solvability ammonia nitrogen and phosphorus in livestock and poultry cultivation sewage form ammoniomagnesium phosphate crystal body, the preferred MgCl of described magnesia mixture
26H
2o and MgSO
4.7H
2o, the preferred Na of described phosphoric acid salt
3pO
412H
2o and Na
2hPO
412H
2o, in described chemical agent, magnesium salts and phosphatic dosage are to make the Mg in sewage after adding described chemical agent
2+, NH
4 +and PO
4 3-mol ratio be (1-1.5): (1-1.3): 1:1;
Preferably, described physical chemistry treatment unit further is set to:
Adopt flocculation agent, preferred aluminium salt, more preferably poly aluminium chloride is flocculated to the ammonium phosphate salt xln of the suspension organic pollutant in sewage and formation;
Preferably, described physical chemistry treatment unit further is set to:
Before the employing chemical agent carries out the physical chemistry processing to livestock and poultry cultivation sewage, adopt device for trapping, preferably grid is held back the macrobead bits in livestock and poultry cultivation sewage, held back macrobead bits is mixed with feces of livestock and poultry, to produce fertilizer.
Wherein, described biochemical treatment apparatus further is set to:
By aerobe, sewage is carried out to biochemical treatment, further remove the dissolved organic matter in sewage, the sewage after making to process reaches the secondary standard in the urban wastewater treatment firm pollutant emission standard;
Preferably, described discharge equipment further is set to:
The part of the processing water after biochemical treatment apparatus is processed is as the recycle of livestock and poultry colony house wash-down water, and remaining processing water directly discharges or for irrigated farmland;
Preferably; described scale animal and poultry cultivation sewage disposal device further comprises sludge treatment equipment; described sludge treatment equipment is set to respectively the mud after described biochemical treatment apparatus and the processing of described physical chemistry treatment unit be concentrated; and through dehydration; preferably after filter-press dehydration, be transported to compositing system; with feces of livestock and poultry, mix, to produce fertilizer.
Below being elaborated to technical solution of the present invention.
In fact, the purpose that adopts wash-down water to rinse livestock and poultry colony house ground is to rinse the pollutents such as residual excrement slag after cleaning ight soil and urine, therefore the water quality for the wash-down water that rinses livestock and poultry colony house ground does not need high standard requirement as tap water, only need meet after the colony house flushing, do not produce the disadvantageous factor of growth of animals or poultry or do not produce secondary pollution to get final product.Based on this, the present invention be take and realized that livestock and poultry breeding industry pollution emission reduction or " zero " discharge is target, opens the new technology of aquaculture wastewater recycling and circular treatment.Scale animal and poultry cultivation sewage water treatment method of the present invention comprises: add chemical agent in livestock and poultry cultivation sewage, preferably magnesium salts and phosphoric acid salt, under the condition of pH value 8-10, make the ammonia nitrogen (NH in sewage
4 +) and phosphorus (PO
4 3-) form ammonium phosphate salt (preferably phosphoric acid ammonium magnesium) xln, and add flocculation agent (aluminium salt, preferably poly aluminium chloride), to remove suspension organism, ammonia nitrogen and the phosphorus in sewage simultaneously.
Preferably, the present invention, by the livestock and poultry cultivation sewage to containing ammonia nitrogen in high density, phosphorus, adds magnesium salts and phosphoric acid salt and controls reaction conditions, generates the ammoniomagnesium phosphate crystal body, reduces the ammonia nitrogen phosphorus content in water body, and chemical equation is as follows:
Mg
2++PO
4 3-+NH
4 ++6H
2O→MgNH
4PO
4·6H
2O↓ ①
Magnesium ammonium phosphate (the MgNH generated in reaction
4pO
46H
2o) popular name struvite, be important industrial raw material and agriculture slow release fertilizer, can be used for producing fertilizer, to be applied to farmland, therefore adopts method of the present invention can realize effective utilization of pollutent.
The characteristics of livestock and poultry cultivation sewage are organism (COD), the NH that contains higher concentration
3-N, PO
4 -3deng, according to the difference of clear excrement technique, total phosphorous fluctuates between 100-200mg/L, and ammonia-nitrogen content fluctuates between 200-2000mg/L.In method of the present invention, the magnesium salts added and phosphatic amount, need make Mg in sewage
2+, NH
4 +and PO
4 3-mol ratio reach (1-1.5): (1-1.3): 1, then regulate pH, at suitable pH(pH8-10) under condition, generate the ammoniomagnesium phosphate crystal body, add again subsequently appropriate flocculation agent (aluminium salt, as poly aluminium chloride etc.), make suspension organic pollutant in sewage and ammonium phosphate salt (magnesium ammonium phosphate) xln of formed fine particle form flocs unit, and by its removal.
Owing to processing in (crystallization reaction and flocculation) process at above-mentioned physical chemistry, removed a large amount of organism and most ammonia nitrogen and phosphorus, greatly reduce the difficulty of its water outlet subsequent disposal.Again through follow-up aerobic Biological Treatment of Waste Water, to remove the solvability organic pollutant in sewage.Effluent quality after aerobe is processed, can reach the secondary standard in urban wastewater treatment firm pollutant emission standard (GB18918-2002) fully, and can meet the requirement as livestock and poultry colony house wash-down water.The major part of the processing water after above-mentioned processing is carried out to recycle as livestock and poultry colony house wash-down water, remain that a small amount of processing water can directly discharge or for irrigated farmland, thereby realize the purpose of aquaculture wastewater recycle and reduction of discharging or pollution " zero " discharge, be conducive to the Sustainable development of livestock industry.
Compared with prior art, scale animal and poultry cultivation sewage water treatment method of the present invention has the following advantages:
One, in method of the present invention, in livestock and poultry cultivation sewage, add the chemical agents such as magnesium salts and phosphoric acid salt, make the ammonia nitrogen (NH in sewage
4 +) and phosphorus (PO
4 3-) forming ammonium phosphate salt (magnesium ammonium phosphate) xln, the ammonium phosphate salt of formation (magnesium ammonium phosphate) xln can be used as industrial raw material or, for the production of fertilizer, had both reduced pollution, has realized again effective utilization of pollutent;
Two, the present invention adopts the circulation and regeneration technology means, and the actual requirement in conjunction with for livestock and poultry colony house wash-down water, make the ammonia nitrogen (NH in sewage
4 +) and phosphorus (PO
4 3-) formation ammoniomagnesium phosphate crystal body, and add flocculation agent, make the organism (SS) in sewage, ammonia nitrogen and phosphorus are removed simultaneously, process through further aerobic microbiological the solvability organic pollutant of removing in sewage again, to obtain can be used for the wash-down water that the livestock and poultry colony house rinses, thereby realized the recycle of wash-down water, the waste of the water resources of avoiding adopting underground water or tap water to bring as livestock and poultry colony house wash-down water, the pollution of minimizing to the ambient water environment, not only solved the Pollution from livestock and poultry problem, and reached the resource recycling utilization and realized pollution reduction or the purpose of " zero " discharge, manipulation of regeneration and the recycle of aquaculture wastewater have finally been realized, be conducive to the Sustainable development of livestock industry.
The accompanying drawing explanation
Below, describe by reference to the accompanying drawings embodiment of the present invention in detail, wherein:
The schema that Fig. 1 is scale animal and poultry cultivation sewage water treatment method of the present invention;
The structural representation that Fig. 2 is scale animal and poultry cultivation sewage disposal device of the present invention;
The schema of the scale animal and poultry cultivation sewage water treatment method that Fig. 3 is the embodiment of the present invention.
Embodiment
Referring to specific embodiment, the present invention is described.It will be appreciated by those skilled in the art that these embodiment are only for the present invention is described, the scope that it does not limit the present invention in any way.
The schema of the scale animal and poultry cultivation sewage water treatment method that Fig. 3 is specific embodiments of the invention, as shown in Figure 3, the idiographic flow of scale animal and poultry cultivation sewage water treatment method of the present invention is as follows:
1) aquaculture wastewater that the livestock and poultry colony house produces, flow into the sewage equalizing tank by grid.Wherein grid is for holding back the macrobead bits of aquaculture wastewater, and the macrobead bits of holding back are with after feces of livestock and poultry mixes, and is transported to compositing system with for the production of fertilizer, and then is applied to farmland.
2) sewage in the sewage equalizing tank is after homogeneous, in promoting with sump pump, being transferred to the process of reaction tank, with medicament (magnesium salts/phosphate solution), mixes, and makes to add after medicament Mg in sewage
2+, NH
4 +and PO
4 3-mol ratio reach (1-1.5): (1-1.3): 1, and add appropriate NaOH, regulate pH value and flow into reaction tank for after 8-10, in reaction tank, generation ammoniomagnesium phosphate crystal body, flow into settling bowl subsequently.
3), before entering settling bowl, the sewage in reaction tank mixes the generation flocculation reaction with the flocculation agent (poly aluminium chloride) from the flocculation agent storage tank, then flows into settling bowl.
4) in settling bowl, suspension organism (SS) and the pollutents such as solvability ammonia nitrogen and phosphorus in sewage are removed by reactions such as crystallization, flocculations simultaneously, and its supernatant liquor flows in the aerobe aeration tank.
5) the processing water after settling bowl is processed, in the aerobe aeration tank, by aerobe, is further removed the solvability organic pollutant in sewage, flows into subsequently second pond.
6) supernatant liquor in second pond flows into clean water basin and stores, and the major part of the processing water in clean water basin (60%-80%, preferably 70%) is utilized as the wash-down water recirculation of livestock and poultry colony house, and a small amount of processing water of residue is directly used in to irrigated farmland or qualified discharge.
7) by the mud of sedimentation in settling bowl and the excess sludge in second pond, drain in sludge thickener and concentrated, wherein the supernatant liquor in sludge thickener is back to the sewage equalizing tank, to realize recycle; And deliver to compositing system after the plate-and-frame filter press processed through concentrated mud, mix with feces of livestock and poultry and produce fertilizer, to be applied to farmland.And the filtrate produced through the plate-and-frame filter press dehydration is transported to the sewage equalizing tank, carry out circular treatment.In addition, the active sludge of sedimentation in second pond is returned to the aerobe aeration tank, as bacterial classification, carry out recycle.
Above specific description of embodiments of the present invention does not limit the present invention, and those skilled in the art can make according to the present invention various changes or distortion, only otherwise break away from spirit of the present invention, all should belong to the scope of claims of the present invention.
Claims (10)
1. a scale animal and poultry cultivation sewage water treatment method comprises the following steps:
Step a: adopt chemical agent to carry out the physical chemistry processing to livestock and poultry cultivation sewage, make solvability ammonia nitrogen and phosphorus in livestock and poultry cultivation sewage form the ammonium phosphate salt xln, then by flocculation, the ammonium phosphate salt xln and the suspension organic pollutant that in sewage, form are together removed;
Step b: the sewage after step a processes is carried out to biochemical treatment, further remove the solvability organic pollutant in sewage;
Step c: by the part of the processing water after step b processes as the recycle of livestock and poultry colony house wash-down water.
2. scale animal and poultry cultivation sewage water treatment method according to claim 1; it is characterized in that; in described step a, adopt chemical agent to carry out the physical chemistry processing to livestock and poultry cultivation sewage; specifically comprise: in livestock and poultry cultivation sewage, add magnesium salts and phosphoric acid salt; and adjusting pH value is 8-10; preferably adopt NaOH solution to regulate the pH value, make solvability ammonia nitrogen and phosphorus in livestock and poultry cultivation sewage form ammoniomagnesium phosphate crystal body, the preferred MgCl of described magnesium salts
26H
2o and MgSO
4.7H
2o, the preferred Na of described phosphoric acid salt
3pO
412H
2o and Na
2hPO
412H
2o.
3. scale animal and poultry cultivation sewage water treatment method according to claim 2, is characterized in that, in described chemical agent, magnesium salts and phosphatic dosage are to make the Mg in sewage after adding described chemical agent
2+, NH
4 +and PO
4 3-mol ratio be (1-1.5): (1-1.3): 1.
4. according to the described scale animal and poultry cultivation sewage water treatment method of any one in claim 1-3; it is characterized in that; adopt flocculation agent in described step a, preferred aluminium salt, more preferably poly aluminium chloride is flocculated to ammonium phosphate salt xln and the suspension organic pollutant formed in sewage.
5. according to the described scale animal and poultry cultivation sewage water treatment method of any one in claim 1-4; it is characterized in that; in described step a; before the employing chemical agent carries out the physical chemistry processing to livestock and poultry cultivation sewage; adopt device for trapping; preferably grid is held back the macrobead bits in livestock and poultry cultivation sewage, held back macrobead bits is mixed with feces of livestock and poultry, to produce fertilizer.
6. according to the described scale animal and poultry cultivation sewage water treatment method of any one in claim 1-5; it is characterized in that; by aerobe, sewage is carried out to biochemical treatment in described step b; further remove the dissolved organic matter in sewage, the sewage after making to process reaches the secondary standard in the urban wastewater treatment firm pollutant emission standard.
7. according to the described scale animal and poultry cultivation sewage water treatment method of any one in claim 1-6, it is characterized in that, in described step c by the 60%-80% of the processing water after step b processes, preferably 70% as the recycle of livestock and poultry colony house wash-down water, and remaining processing water directly discharges or for irrigated farmland;
Preferably, respectively the mud after step b and step a processing is concentrated, and, through processed, preferably after filter-press dehydration is processed, be transported to compositing system, mixed with feces of livestock and poultry, to produce fertilizer.
8. a scale animal and poultry cultivation sewage disposal device comprises: physical chemistry treatment unit, biochemical treatment apparatus and discharge equipment, wherein:
Described physical chemistry treatment unit is set to adopt chemical agent to carry out the physical chemistry processing to livestock and poultry cultivation sewage, make solvability ammonia nitrogen and phosphorus in livestock and poultry cultivation sewage form the ammonium phosphate salt xln, then by flocculation, the ammonium phosphate salt xln and the suspension organic pollutant that form in sewage are together removed, and the sewage after flocculation treatment is transported to described biochemical treatment apparatus;
Described biochemical treatment apparatus is set to the sewage after described physical chemistry treatment unit is processed is carried out to biochemical treatment, further removes the solvability organic pollutant in sewage, and by the processing water transport after biochemical treatment to described discharge equipment;
Described discharge equipment is set to using the part of the processing water after described biochemical treatment apparatus is processed as the recycle of livestock and poultry colony house wash-down water.
9. scale animal and poultry cultivation sewage disposal device according to claim 8; it is characterized in that; described physical chemistry treatment unit employing chemical agent carries out the physical chemistry processing to livestock and poultry cultivation sewage and specifically comprises: in livestock and poultry cultivation sewage, add magnesium salts and phosphoric acid salt; regulating the pH value is 8-10; preferably adopt NaOH solution to regulate the pH value; make solvability ammonia nitrogen and phosphorus in livestock and poultry cultivation sewage form ammoniomagnesium phosphate crystal body, the preferred MgCl of described magnesium salts
26H
2o and MgSO
4.7H
2o, the preferred Na of described phosphoric acid salt
3pO
412H
2o and Na
2hPO
412H
2o, in described chemical agent, magnesium salts and phosphatic dosage are to make the Mg in sewage after adding described chemical agent
2+, NH
4 +and PO
4 3-mol ratio be (1-1.5): (1-1.3): 1:1;
Preferably, described physical chemistry treatment unit further is set to:
Adopt flocculation agent, preferred aluminium salt, more preferably poly aluminium chloride is flocculated to the ammonium phosphate salt xln of the suspension organic pollutant in sewage and formation;
Preferably, described physical chemistry treatment unit further is set to:
Before the employing chemical agent carries out the physical chemistry processing to livestock and poultry cultivation sewage, adopt device for trapping, preferably grid is held back the macrobead bits in livestock and poultry cultivation sewage, held back macrobead bits is mixed with feces of livestock and poultry, to produce fertilizer.
10. scale animal and poultry cultivation sewage disposal device according to claim 8 or claim 9, is characterized in that, described biochemical treatment apparatus further is set to:
By aerobe, sewage is carried out to biochemical treatment, further remove the dissolved organic matter in sewage, the sewage after making to process reaches the secondary standard in the urban wastewater treatment firm pollutant emission standard;
Preferably, described discharge equipment further is set to:
The part of the processing water after biochemical treatment apparatus is processed is as the recycle of livestock and poultry colony house wash-down water, and remaining processing water directly discharges or for irrigated farmland;
Preferably; described scale animal and poultry cultivation sewage disposal device further comprises sludge treatment equipment; described sludge treatment equipment is set to respectively the mud after described biochemical treatment apparatus and the processing of described physical chemistry treatment unit be concentrated; and through dehydration; preferably after filter-press dehydration, be transported to compositing system; with feces of livestock and poultry, mix, to produce fertilizer.
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| CN117054479A (en) * | 2023-08-16 | 2023-11-14 | 湖南工商大学 | Method and device for tracing watershed water pollutants |
| CN117054479B (en) * | 2023-08-16 | 2024-05-14 | 湖南工商大学 | Method and device for tracing watershed water pollutants |
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Application publication date: 20130626 |