CN105036489A - Livestock/poultry culture wastewater deep denitrification and dephosphorization standard treatment device and process - Google Patents
Livestock/poultry culture wastewater deep denitrification and dephosphorization standard treatment device and process Download PDFInfo
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Abstract
The invention discloses a livestock/poultry culture wastewater deep denitrification and dephosphorization standard treatment device and process. On the basis of the anaerobic fermentation technique, microaerobic aeration technique and nitrogen phosphorus recovery technique, the synchronous microaerobic aeration/denitrification-decarbonization coupled coagulation crystallization dephosphorization standard treatment process with reinforced denitrification and dephosphorization is formed to lower the operating cost. The process specifically comprises the following steps: livestock/poultry culture wastewater is firstly subjected to solid-liquid separation treatment, the waste slag is used for producing organic fertilizers, and the wastewater is used as a resource to enter a UASB (upflow anaerobic sludge blanket) reactor and is subjected to anaerobic fermentation to produce biogas; high-concentration nitrogen phosphorus anaerobic effluent water enters a microaerobic aeration biochemical reactor to perform synchronous denitrification-decarbonization; and biochemical effluent water continuously enters a coagulation crystallization dephosphorization clarifier to perform nitrogen phosphorus recovery, the crystalline solid containing nitrogen and phosphorus nutrients is used as a raw material for producing organic fertilizers, and the standard clear water is discharged. The device has the advantages of favorable denitrification-decarbonization effect, high nitrogen/phosphorus resource recovery ratio, high impact load resistance and low operating cost, and is easy for popularization and application.
Description
Technical field
The invention belongs to environment-protection wastewater process field, particularly a kind of livestock breeding wastewater advanced nitrogen dephosphorization treatment unit up to standard and technique thereof.
Background technology
The Eleventh Five-Year Plan period, country has carried out comprehensive improvement to the whole nation by the river of agricultural area source severe contamination, especially quite effective at large scale of pig farm waste water pollution control this respect, waste water COD
crconcentration can realize qualified discharge substantially.But concentration of nitrogen and phosphorus severe overweight, makes region plant receiving water body nitrogen and phosphorus load excessive, causes body eutrophication." 12 " period, country is by keypoint treatment large-scale cultivation industry waste water nitrogen and phosphorus pollution, and the dephosphorization of strengthening denitrogenation of waste water, the cultivation of feasible region plant discharges pollutants and minimizes.Along with " livestock and poultry breeding industry pollution discharge standard " (secondary exposure draft in 2014) is put into effect, wastewater discharge standard will rise to COD
cr150mg/L, ammonia nitrogen 40mg/L, total nitrogen 70mg/L and total phosphorus 5mg/L, and the existing waste water treatment process of Large-scale pig farm is difficult to make discharged wastewater met the national standard, is badly in need of the efficient low-consume livestock breeding wastewater treatment process facility that exploitation is advanced.Therefore, from proposing mark transformation and promoting the requirement of neighboring area quality of water environment, be badly in need of proposing mark transformation to existing technique and device, emphasis improves denitrogenation dephosphorizing efficiency, to reduce the impact of plant's process tail water on around ecotope.
At present; anaerobically fermenting-aerobic-oxidation pond/artificial wetland combination treatment process is the mainstream technology of China's large-scale pig farm cultivating wastewater purification; but the key issue of this technique is the low ratio of carbon to ammonium pig farm breeding wastewater Digestive system after anaerobically fermenting process; organic pollutants poor removal effect is had in follow-up Aerobic biological process process; denitrogenation dephosphorizing efficiency is low; the problems such as running cost is high, and floor space is large.Large quantity research shows, SBR technique, contact oxidation method, intermittent aeration activated sludge process are to the NH of pig farm breeding wastewater anaerobic digestion solution
4 +-N clearance is only 40-68%, and TN clearance only has 30%.Existing Practical Project shows, anaerobically fermenting-aerobic-oxidation pond/artificial wetland combination treatment process has good removal effect to COD and SS, but there is no significant denitrification dephosphorization function, and resource recycling rate is low, be difficult to the stably reaching standard discharge realizing pig farm changing rejected material to useful resource recycling and breeding wastewater.Polluting for solving large-scale pig farm breeding wastewater, realizing pollution reduction, being applicable to the efficient low-consume process technology up to standard of high concentration N-P pig farm breeding wastewater in the urgent need to exploitation.
Summary of the invention
The present invention seeks to overcome the deficiencies in the prior art; there is provided the dephosphorization of a kind of livestock breeding wastewater advanced nitrogen treatment unit up to standard; impel and mark transformation is carried to pig farm cultivating wastewater purification process implementing; intensified denitrification and dephosphorization; improve resource recycling rate; reduce running cost, realize large-scale pig farm breeding wastewater pollutants discharged into rivers and minimize.
The concrete technical scheme that the present invention adopts is:
A kind of livestock breeding wastewater advanced nitrogen dephosphorization treatment unit up to standard comprises: former water water collect tank, UASB reactor, water distribution tank, Prepositive denitrification pond, micro-oxygen aeration tank, settling tank and coagulation crystallizing-dephosphorizing settler, former water water collect tank water outlet pipeline divides two-way, one tunnel is connected with UASB reactor water-in through grid, another road is connected with water distribution tank water-in after converging with the water outlet of UASB reactor, and water distribution tank is connected with coagulation crystallizing-dephosphorizing settler with Prepositive denitrification pond, micro-oxygen aeration tank, settling tank successively; Be provided with mud return line bottom settling tank, the mud return line the other end connects Prepositive denitrification pond; Whipping appts is equipped with in water distribution tank, Prepositive denitrification pond and coagulation crystallizing-dephosphorizing settler; Prepositive denitrification is provided with filler in the middle part of pond, and bottom is provided with water-distributing device; Aerating apparatus is provided with bottom micro-oxygen aeration tank.
As preferably, described aerating apparatus is micropore aeration pipe, and described filler adopts elastic filler.
Another object of the present invention is to provide a kind of livestock breeding wastewater advanced nitrogen dephosphorization treatment process up to standard using described device, comprises the following steps:
1) the former water of waste water of livestock poultry is after solid-liquid separation, pumps into UASB reactor, produces biogas through anaerobically fermenting;
2) waste water after step 1) process and former water are with (0.8-1.2): 1 carries out water distribution, pump into micro-oxygen aeration simultaneous denitrification except carbon reactor, flow through Prepositive denitrification pond, micro-oxygen aeration tank and settling tank in the reactor successively after water distribution; In Prepositive denitrification pond, denitrifying bacteria utilizes carbon source of easily degrading as electron donor, and the nitric nitrogen refluxed from settling tank and nitrite nitrogen, then as electron acceptor(EA), carry out denitrogenation by denitrification; In micro-oxygen aeration tank, the oxyty controlling waste water, at 0-0.15mg/L, makes the microorganism in waste water carry out short distance nitration and synchronous nitration and denitrification effect; In settling tank, waste water carries out mud-water separation, and sludge part is back to Prepositive denitrification pond, for denitrifying bacterium provides nitric nitrogen and nitrite nitrogen as electron acceptor(EA), and excess sludge periodic exhaustion;
3) step 2) in supernatant liquor after mud-water separation enter coagulation crystallizing-dephosphorizing settler, in settler, add PFS and PAM, mix with waste water and carry out advanced nitrogen dephosphorization, the clear water qualified discharge after process.
As preferably, the biogas obtained in described step 1) is used as generating through collecting, after purification process, and the electric energy of production is to step 2) in equipment energy supply.
As preferably, as the raw material producing fertilizer together with the natural pond slag that in described step 1), anaerobically fermenting the produces crystalline solid that advanced nitrogen dephosphorization produces in described step 4).
As preferably, in described step 1), the hydraulic detention time of UASB reactor is 15 days.
As preferably, described step 2) in micro-oxygen aeration simultaneous denitrification except in carbon reactor, waste water in Prepositive denitrification pond, the hydraulic detention time of micro-oxygen aeration tank and settling tank is respectively 0.625 day, 4.0 days and 0.625 day.
As preferably, described step 2) in micro-oxygen aeration simultaneous denitrification except in carbon reactor, the sludge reflux multiple of settling tank is 3 times of Prepositive denitrification pond flooding velocity.
As preferably, in described step 3), the hydraulic detention time of coagulation crystallizing-dephosphorizing settler is 4 hours, and its operational mode is continous way.
As preferably, the dosage of the PFS of the coagulation crystallizing-dephosphorizing settler described in step 3) is 1.0mL/L waste water, and the dosage of PAM is 2.5mL/L waste water.
The present invention has the following advantages:
(1) Process for Effluent water quality of the present invention is good, total hrt is short, floor space is few.The present invention only just can realize the deep purifying of pig farm breeding wastewater with UASB+ micro-oxygen aeration simultaneous denitrification de-carbon system+coagulation advanced nitrogen dephosphorization system, relative to the treatment process such as oxidation pond and artificial swamp, considerably reduce floor space and total hrt.Large-scale pig farm breeding wastewater, through multi-level combined treatment process, can make stable effluent quality reach " livestock and poultry breeding industry pollutant emission standard " (secondary exposure draft in 2014) emission request, realizes proposing mark transformation.
(2) to have removal of carbon and nitrogen efficiency high for micro-oxygen aeration synchronous high-efficiency removal of carbon and nitrogen system, and capacity of resisting impact load is strong, and working cost is low, and operational management is feature easily.1. the COD of micro-oxygen aeration synchronous high-efficiency removal of carbon and nitrogen reactor
crclearance is up to 90%, and nitrogen removal rate is up to 90%, and total tp removal rate is about 70%.Principal pollutant COD in the breeding wastewater of pig farm
cr, total nitrogen and total phosphorus can obtain very effective removal at this element.2. micro-oxygen aeration biochemical reactor sludge reflux is utilized, the high sludge concentration of anaerobic denitrifying pond processing unit in guarantee system, makes current keep circulating, enhances muddy water contact, strengthen simultaneous denitrification de-carbon function, system has very strong capacity of resisting impact load.3. micro-oxygen aerating system takes the oxyty in dissolved oxygen control instrument automatic control system, and realize synchronous short-cut nitrification and denitrification, nitric efficiency is high, and operational management is convenient.4. because system takes micro-oxygen aeration, relative to pure oxygen aeration, can reduce by the aeration rate of 25%, effectively reduce running cost.
(3) the present invention takes the crystallization of materialization coagulation, effectively can remove the nitrogen and phosphorus content of breeding wastewater, and the coagulation crystalline deposit obtained can be used as fertilizer.Materialization coagulation can realize waste water nutrient and reclaim while carrying out advanced nitrogen dephosphorization to waste water, realize the recycling of breeding wastewater.In addition, the pharmaceutical quantities used due to the coagulation crystallizing-dephosphorizing settler of this technique is relatively less, so can reduce the reagent cost of coagulation system.
(4) the present invention is high to the low ratio of carbon to ammonium natural pond liquid denitrogenation dephosphorizing efficiency after livestock breeding wastewater anaerobically fermenting, and without the need to additional carbon and basicity again.
(5) pig farm of the present invention breeding waste resource utilization rate is high.The biogas that anaerobically fermenting produces is used for generating, and electric power supply micro-oxygen aeration simultaneous denitrification of production, except the power-equipment of carbon reactor, realizes energy recovery and utilizes, reduce running cost.The natural pond slag that the waste residue of solid-liquid separation generation simultaneously, anaerobically fermenting produce and coagulation crystalline solid can be used as the raw material producing fertilizer, and breeding waste resource recycling rate is maximized.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of livestock breeding wastewater advanced nitrogen dephosphorization treatment unit up to standard;
Fig. 2 is a kind of livestock breeding wastewater advanced nitrogen dephosphorization processing technological flow figure up to standard.
In figure: former water water collect tank 1, UASB reactor 2, water distribution tank 3, Prepositive denitrification pond 4, micro-oxygen aeration tank 5, settling tank 6, coagulation crystallizing-dephosphorizing settler 7, filler 8, water-distributing device 9, aerating apparatus 10 and grid 11.
Embodiment
Below in conjunction with accompanying drawing and specific examples, the present invention is further described:
As shown in Figure 1, a kind of livestock breeding wastewater advanced nitrogen dephosphorization treatment unit up to standard comprises: former water water collect tank 1, UASB reactor 2, water distribution tank 3, Prepositive denitrification pond 4, micro-oxygen aeration tank 5, settling tank 6 and coagulation crystallizing-dephosphorizing settler 7, former water water collect tank 1 water outlet pipeline divides two-way, one tunnel is connected with UASB reactor 2 water-in through grid 11, another road is connected with water distribution tank 3 water-in after converging with the water outlet of UASB reactor 2, and water distribution tank 3 is connected with coagulation crystallizing-dephosphorizing settler 7 with Prepositive denitrification pond 4, micro-oxygen aeration tank 5, settling tank 6 successively; Be provided with mud return line bottom settling tank 6, the mud return line the other end connects Prepositive denitrification pond 4; Whipping appts is equipped with in water distribution tank 3, Prepositive denitrification pond 4 and coagulation crystallizing-dephosphorizing settler 7; Be provided with filler 8 in the middle part of Prepositive denitrification pond, filler 8 adopts elastic filler.Water-distributing device 9 is provided with bottom Prepositive denitrification pond.Be provided with aerating apparatus 10 bottom micro-oxygen aeration tank, aerating apparatus 10 is micropore aeration pipe.In native system, Prepositive denitrification pond 4, micro-oxygen aeration tank 5, settling tank 6 three form a micro-oxygen aeration simultaneous denitrification except carbon reactor
Below for Yuhang District mass-producing kind pig farm, Hangzhou, Zhejiang province city cultivating wastewater purification process, utilize said apparatus to process piggery wastewater, former water and anaerobically fermenting effluent quality situation as shown in table 1:
table 1 Hangzhou mass-producing kind pig farm waste water quality
Unit: mg/L (except pH value)
The idiographic flow of inventive method is as Fig. 2, by 150 tons of former water of piggery wastewater through grid solid-liquid separation, waste water after separation pumps into UASB reactor and carries out anaerobically fermenting reaction, the biogas produced in anaerobic fermentation process is used as generating after collection, purification process, and the electric energy of production is to the equipment energy supply in system.UASB reactor reaction after 15 days COD concentration can be reduced to about 2500mg/L.After anaerobic reaction terminates, anaerobic effluent and former water are carried out water distribution according to the ratio of 1:1, then pump into the Prepositive denitrification pond of micro-oxygen aeration simultaneous denitrification de-carbon system, the mud mixture of settling tank is back in Prepositive denitrification pond with 3 times of Prepositive denitrification pond flooding velocity simultaneously.In Prepositive denitrification pond, the nitric nitrogen refluxed from settling tank and nitrite nitrogen utilize easily degraded carbon source to carry out denitrification denitrogenation de-carbon, the oxyty being controlled micro-oxygen aeration tank by online dissolved oxygen meter is 0-0.15mg/L, realize short distance nitration and synchronous nitration and denitrification, and whole system is without the need to additional carbon.During steady running, the effluent COD concentration that simultaneous denitrification removes carbon reactor is less than 300mg/L, and water outlet ammonia nitrogen concentration is less than 10mg/L, water outlet total nitrogen concentration is less than 60mg/L, and water outlet total phosphorus concentration is less than 15mg/L, and corresponding clearance is 87%-94%, 97%-99%, 90%-95% and 65%-70%.Micro-oxygen aeration reactor bio-chemical effluent enters in settling tank, and make waste water carry out mud-water separation, sludge part is back to Prepositive denitrification pond, for it provides nitric nitrogen and nitrite nitrogen, and excess sludge periodic exhaustion.Settling tank supernatant liquor is acted on by gravity flow and enters coagulation advanced nitrogen dephosphorization settler continuously, PFS and PAM pumps in settler by volume pump, mixed by agitator, the hydraulic detention time of coagulation crystallizing-dephosphorizing settler is 4 hours, and its operational mode is continous way.Precipitation post crystallization solid sinks to bottom, and discharged by sludge drainage system, the natural pond slag produced with waste residue and the anaerobically fermenting of solid-liquid separation is as the raw material producing fertilizer.The dosage of PFS and PAM is respectively 150L/ days and 375L/ days.Meanwhile, can realize advanced nitrogen dephosphorization in coagulation unit, COD also can obtain effectively removing further, and clearance reaches about 50%, and nitrogen removal rate is about 20%, and total tp removal rate is greater than 95%.The last water outlet COD≤150mg/L of present invention process, ammonia nitrogen≤25mg/L, total nitrogen≤40mg/L, total phosphorus≤3.0mg/L, can reach the emission request of " livestock and poultry breeding industry pollutant emission standard " (secondary exposure draft in 2014).
This technique to the concrete treatment effect of above-mentioned waste water as following table
The Inlet and outlet water water quality situation of table 2 waste water treatment process
As can be seen here, device of the present invention and the processing efficiency of technique to waste water of livestock poultry denitrogenation dephosphorizing higher, compared with prior art, there is outstanding substantive distinguishing features and significant progressive.
Claims (10)
1. livestock breeding wastewater advanced nitrogen dephosphorization treatment unit up to standard, it is characterized in that, comprise: former water water collect tank, UASB reactor, water distribution tank, Prepositive denitrification pond, micro-oxygen aeration tank, settling tank and coagulation crystallizing-dephosphorizing settler, former water water collect tank water outlet pipeline divides two-way, one tunnel is connected with UASB reactor water-in through grid, another road is connected with water distribution tank water-in after converging with the water outlet of UASB reactor, and water distribution tank is connected with coagulation crystallizing-dephosphorizing settler with Prepositive denitrification pond, micro-oxygen aeration tank, settling tank successively; Be provided with mud return line bottom settling tank, the mud return line the other end connects Prepositive denitrification pond; Whipping appts is equipped with in water distribution tank, Prepositive denitrification pond and coagulation crystallizing-dephosphorizing settler; Prepositive denitrification is provided with filler in the middle part of pond, and bottom is provided with water-distributing device; Aerating apparatus is provided with bottom micro-oxygen aeration tank.
2. livestock breeding wastewater advanced nitrogen dephosphorization treatment unit up to standard as claimed in claim 1, it is characterized in that, described aerating apparatus is micropore aeration pipe, and described filler adopts elastic filler.
3. use a livestock breeding wastewater advanced nitrogen dephosphorization treatment process up to standard for device described in claim 1, it is characterized in that, comprise the following steps:
1) the former water of waste water of livestock poultry is after solid-liquid separation, pumps into UASB reactor, produces biogas through anaerobically fermenting;
2) waste water after step 1) process and former water are with (0.8-1.2): 1 carries out water distribution, pump into micro-oxygen aeration simultaneous denitrification except carbon reactor, flow through Prepositive denitrification pond, micro-oxygen aeration tank and settling tank in the reactor successively after water distribution; In Prepositive denitrification pond, denitrifying bacteria utilizes carbon source as electron donor, and the nitric nitrogen refluxed from settling tank and nitrite nitrogen, then as electron acceptor(EA), carry out denitrogenation by denitrification; In micro-oxygen aeration tank, the oxyty controlling waste water, at 0-0.15mg/L, makes the microorganism in waste water carry out short distance nitration and synchronous nitration and denitrification effect; In settling tank, waste water carries out mud-water separation, and sludge part is back to Prepositive denitrification pond, for denitrifying bacterium provides nitric nitrogen and nitrite nitrogen as electron acceptor(EA), and excess sludge periodic exhaustion;
3) step 2) in supernatant liquor after mud-water separation enter coagulation crystallizing-dephosphorizing settler, in settler, add PFS and PAM, mix with waste water and carry out advanced nitrogen dephosphorization, the clear water qualified discharge after process.
4. livestock breeding wastewater advanced nitrogen dephosphorization treatment process up to standard as claimed in claim 3, is characterized in that, the biogas obtained in described step 1) is used as generating through collecting, after purification process, and the electric energy of production is to step 2) in equipment energy supply.
5. livestock breeding wastewater advanced nitrogen dephosphorization treatment process up to standard as claimed in claim 3, it is characterized in that, as the raw material producing fertilizer together with the natural pond slag that in described step 1), anaerobically fermenting the produces crystalline solid that advanced nitrogen dephosphorization produces in described step 4).
6. livestock breeding wastewater advanced nitrogen dephosphorization treatment process up to standard as claimed in claim 3, it is characterized in that, in described step 1), the hydraulic detention time of UASB reactor is 15 days.
7. livestock breeding wastewater advanced nitrogen dephosphorization treatment process up to standard as claimed in claim 3, it is characterized in that, described step 2) in micro-oxygen aeration simultaneous denitrification except in carbon reactor, waste water in Prepositive denitrification pond, the hydraulic detention time of micro-oxygen aeration tank and settling tank is respectively 0.625 day, 4.0 days and 0.625 day.
8. a kind of livestock breeding wastewater advanced nitrogen dephosphorization treatment process up to standard according to right 3, it is characterized in that, described step 2) in micro-oxygen aeration simultaneous denitrification except in carbon reactor, the sludge reflux multiple of settling tank is 3 times of Prepositive denitrification pond flooding velocity.
9. a kind of livestock breeding wastewater advanced nitrogen dephosphorization treatment process up to standard according to right 3, it is characterized in that, in described step 3), the hydraulic detention time of coagulation crystallizing-dephosphorizing settler is 4 hours, and its operational mode is continous way.
10. a kind of livestock breeding wastewater advanced nitrogen dephosphorization treatment process up to standard according to right 3, it is characterized in that, the dosage of the PFS of the coagulation crystallizing-dephosphorizing settler described in step 3) is 1.0mL/L waste water, the dosage of PAM is 2.5mL/L waste water.
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| CN105541008A (en) * | 2015-12-22 | 2016-05-04 | 浙江大学 | An efficient denitrifying and carbon-removing device for culture wastewater anaerobic biogas slurry with a low C/N ratio and a process thereof |
| CN106186582A (en) * | 2016-08-31 | 2016-12-07 | 南京河海环境研究院有限公司 | The degraded of a kind of brewing wastewater high-enriched organics and the processing means of denitrogenation |
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| CN107459207A (en) * | 2017-08-23 | 2017-12-12 | 中国农业大学 | A kind of integrating device of cultivating wastewater purification and its application |
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