CN114044576A - Method for purifying pig-raising wastewater by scenedesmus attachment culture - Google Patents
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- 239000002351 wastewater Substances 0.000 title claims abstract description 89
- 241000195663 Scenedesmus Species 0.000 title claims abstract description 55
- 238000000034 method Methods 0.000 title claims abstract description 34
- 239000000463 material Substances 0.000 claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 7
- 238000012258 culturing Methods 0.000 claims abstract description 5
- 241000282898 Sus scrofa Species 0.000 claims description 51
- 239000004746 geotextile Substances 0.000 claims description 16
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 12
- 238000010790 dilution Methods 0.000 claims description 11
- 239000012895 dilution Substances 0.000 claims description 11
- 238000001035 drying Methods 0.000 claims description 7
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 6
- 239000000853 adhesive Substances 0.000 claims description 6
- 230000001070 adhesive effect Effects 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- 229910052698 phosphorus Inorganic materials 0.000 claims description 6
- 239000011574 phosphorus Substances 0.000 claims description 6
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims description 3
- 238000010899 nucleation Methods 0.000 claims 1
- 241000195493 Cryptophyta Species 0.000 description 9
- 230000001954 sterilising effect Effects 0.000 description 9
- 239000001963 growth medium Substances 0.000 description 6
- 239000002028 Biomass Substances 0.000 description 5
- 238000000746 purification Methods 0.000 description 5
- 241000894006 Bacteria Species 0.000 description 4
- 239000000706 filtrate Substances 0.000 description 4
- 238000005286 illumination Methods 0.000 description 4
- 238000011081 inoculation Methods 0.000 description 4
- 238000004659 sterilization and disinfection Methods 0.000 description 4
- 239000006228 supernatant Substances 0.000 description 4
- 235000007122 Scenedesmus obliquus Nutrition 0.000 description 3
- 241000195662 Tetradesmus obliquus Species 0.000 description 3
- 235000015097 nutrients Nutrition 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000005034 decoration Methods 0.000 description 2
- 230000029087 digestion Effects 0.000 description 2
- 238000007865 diluting Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000035755 proliferation Effects 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 241001474374 Blennius Species 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- APUPEJJSWDHEBO-UHFFFAOYSA-P ammonium molybdate Chemical compound [NH4+].[NH4+].[O-][Mo]([O-])(=O)=O APUPEJJSWDHEBO-UHFFFAOYSA-P 0.000 description 1
- 229940010552 ammonium molybdate Drugs 0.000 description 1
- 235000018660 ammonium molybdate Nutrition 0.000 description 1
- 239000011609 ammonium molybdate Substances 0.000 description 1
- 230000001580 bacterial effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009395 breeding Methods 0.000 description 1
- 230000001488 breeding effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000005119 centrifugation Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000004737 colorimetric analysis Methods 0.000 description 1
- 238000012136 culture method Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000009313 farming Methods 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 238000005188 flotation Methods 0.000 description 1
- 238000011534 incubation Methods 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- JRKICGRDRMAZLK-UHFFFAOYSA-L peroxydisulfate Chemical compound [O-]S(=O)(=O)OOS([O-])(=O)=O JRKICGRDRMAZLK-UHFFFAOYSA-L 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000002798 spectrophotometry method Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/32—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
- C02F3/322—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae use of algae
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N1/00—Microorganisms, e.g. protozoa; Compositions thereof; Processes of propagating, maintaining or preserving microorganisms or compositions thereof; Processes of preparing or isolating a composition containing a microorganism; Culture media therefor
- C12N1/12—Unicellular algae; Culture media therefor
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/20—Nature of the water, waste water, sewage or sludge to be treated from animal husbandry
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Abstract
The invention provides a method for purifying pig-raising wastewater by scenedesmus attachment culture, and relates to the technical field of water quality treatment. The method of the invention comprises the following steps: inoculating Scenedesmus into the pig raising wastewater, and culturing for 8-12 d; (ii) the Scenedesmus sp.lx1; scenedesmus attachment materials are added into the pig raising wastewater. The method for treating the pig raising wastewater can obviously remove COD, TN, TP and NH in the pig raising wastewater4 +And N, achieving the purpose of purifying the pig raising wastewater.
Description
Technical Field
The invention relates to the technical field of water quality treatment, in particular to a method for purifying pig-raising wastewater by scenedesmus adhesion culture.
Background
The rapid development of the breeding industry brings economic benefits and simultaneously produces a large amount of waste water. The pig raising wastewater is high-concentration wastewater, has the characteristics of large instantaneous discharge, high nitrogen and phosphorus content, solid-liquid mixing and difficult degradation, can cause environmental pollution if directly discharged into the environment without proper treatment, and can also influence the health of human bodies. Algae can maintain growth and proliferation of algae by using a large amount of nutrient substances such as nitrogen, phosphorus and the like in the wastewater, but if the algae are improperly cultured, the efficiency of purifying the pig raising wastewater is not high, and a large amount of material resources and financial resources are consumed. The culture method in the prior art has extremely low purification efficiency when purifying the pig raising wastewater, and usually consumes a large amount of material resources and financial resources when removing algae in the wastewater, which is not beneficial to large-scale production. Therefore, a method for producing, culturing and collecting microalgae in a large scale with high purification efficiency is urgently needed to meet the defects of the prior art.
Disclosure of Invention
The invention aims to provide a method for purifying pig-raising wastewater by scenedesmus attachment culture.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a method for purifying pig-raising wastewater by scenedesmus adhesion culture, which comprises the following steps:
inoculating Scenedesmus into the pig raising wastewater, and culturing for 8-12 d;
lx1, scenedesmus sp.lx;
scenedesmus attachment materials are added into the pig raising wastewater.
Preferably, the density of the inoculation is 0.8X 106～1.2×106one/mL.
Preferably, the attachment material is geotextile;
the ratio of the area of the geotextile to the bottom area of the container for containing the pig raising wastewater is 0.76-0.8: 1.
Preferably, the pig raising wastewater is diluted pig raising wastewater;
the dilution multiple is 10-20 times; the dilution is carried out with pure water.
Preferably, the COD value of the pig raising wastewater before dilution is 11000-13000 mg/L, the ammonia nitrogen content is 1100-1300 mg/L, the total nitrogen content is 1500-1900 mg/L, and the total phosphorus content is 70-90 mg/L.
Preferably, the temperature of the culture is 20-30 ℃.
Preferably, the illumination intensity of the culture is 1000-2000 lux.
Preferably, the light-dark ratio of the culture is 11-13 h: 11-13 h.
Preferably, the method further comprises a scenedesmus collection step;
the collection method comprises the following steps: taking out the adhesive material, and drying for 1.5-2.5 h at the temperature of 100-110 ℃ to obtain the adhesive material.
The invention provides a method for purifying pig-raising wastewater by scenedesmus adhesion culture, which has the following advantages:
(1) the scenedesmus is cultured in the pig-raising wastewater, so that the scenedesmus can fully utilize nutrient substances such as nitrogen, phosphorus and the like in the wastewater, and additional nutrient salt is not required to be added to maintain the growth and proliferation of the scenedesmus;
(2) the scenedesmus is cultured in the pig raising wastewater, and purification of the pig raising wastewater and accumulation of high-value substances can be realized;
(3) the scenedesmus is inoculated into the pig-raising wastewater carrying the attachment material, so that the problems of unfavorable collection and overhigh cost caused by the methods of sedimentation, flotation, flocculation, centrifugation, scenedesmus fixation on seaweed salt polymer and the like in the prior art when the scenedesmus is harvested can be solved.
Drawings
FIG. 1 the content of dry weight of Scenedesmus per treatment.
FIG. 2 treatment pairs of COD, TN, TP, NH each4 +-removal rate of N.
Detailed Description
The invention provides a method for purifying pig-raising wastewater by scenedesmus adhesion culture, which comprises the following steps:
inoculating Scenedesmus into the pig raising wastewater, and culturing for 8-12 d;
(ii) the Scenedesmus sp.lx1;
scenedesmus attachment materials are added into the pig raising wastewater.
The incubation time is preferably 10 days.
In the present invention, the density of the inoculation is 0.8X 106～1.2×106one/mL, preferably 1X 106one/mL.
In the invention, the attachment material is geotextile;
the ratio of the area of the geotextile to the bottom area of the container for containing the pig raising wastewater is 0.76-0.8: 1, and preferably 0.78: 1.
In the invention, the pig raising wastewater is diluted pig raising wastewater;
the dilution multiple is 10-20 times;
the dilution is carried out by adopting pure water;
sterilizing the diluted pig raising wastewater to obtain sterile pig raising wastewater;
obtaining the pig raising wastewater with bacteria without sterilizing the diluted pig raising wastewater;
the sterilization is high-temperature high-pressure sterilization;
the sterilization temperature is 119-123 ℃, and is preferably 121 ℃;
the sterilization time is 25-35 min, preferably 30 min.
In the invention, the COD value of the pig raising wastewater before dilution is 11000-13000 mg/L, preferably 12000 mg/L;
the ammonia nitrogen content is 1100-1300 mg/L, preferably 1200 mg/L;
the total nitrogen content is 1500-1900 mg/L, preferably 1700 mg/L;
the total phosphorus content is 70-90 mg/L, preferably 80 mg/L.
In the invention, the temperature of the culture is 20-30 ℃, and preferably 25 ℃.
In the invention, the illumination intensity of the culture is 1000-2000 lux, and 1500lux is preferable.
In the invention, the light-dark ratio of the culture is 11-13 h: 11-13 h, preferably 12 h: and (4) 12 h.
In the present invention, the method further comprises a scenedesmus collection step;
the collection method comprises the following steps: taking out the adhesive material, and drying for 1.5-2.5 h at the temperature of 100-110 ℃ to obtain the adhesive material.
The drying temperature is preferably 105 ℃, and the drying time is preferably 2 hours.
The technical solutions provided by the present invention are described in detail below with reference to examples, but they should not be construed as limiting the scope of the present invention.
The Scenedesmus sp.LX1 used in the embodiment of the invention is purchased from the common microorganism center of China Committee for culture Collection of microorganisms, and the collection number of the algae is CGMCC No. 3036.
The method for measuring each index in the embodiment of the invention comprises the following steps:
the COD content is determined by adopting a decomposition tube closed catalytic digestion colorimetric method HJ/T399-2007;
the TP content determination method adopts ammonium molybdate spectrophotometry GB 11893-89;
the TN content determination method adopts an alkaline persulfate digestion photometric EPA color-changing acid method;
NH4 +the method for measuring the content of-N adopts a nano reagent method HJ 535-2009.
The pig wastewater in the embodiment of the invention is obtained from a Lemu pig farm in plain county of Texas City of Shandong province.
In the examples of the present invention, biomass productivity is microalgae attachment amount/(material area × culture time).
In the example of the present invention, the removal rate of COD ═ content of COD in treated swine wastewater-content of COD in purified swine wastewater)/content of COD in treated swine wastewater ] × 100%;
removal rate of TP ═ content of TP in treated swine wastewater-content of TP in purified swine wastewater)/content of TP in treated swine wastewater ] × 100%;
the removal rate of TN is [ (content of TN in the treated swine wastewater-content of TN in the purified swine wastewater)/content of TN in the treated swine wastewater ]. times.100%;
NH4 +removal of-N [ (NH) from treated swine wastewater4 +Content of-N-NH in purified wastewater from pig farming4 +Content of-N)/NH in treated swine wastewater4 +Content of-N]×100％。
Example 1
Filtering wastewater from pig farm of Dezhou city in Shandong with 2 layers of gauze to obtain filtrate, and centrifuging the filtrate at 8000rpm for 10min to obtain supernatant. Diluting the supernatant by 10 times with pure water, sterilizing at 121 deg.C for 30min to obtain sterile pig-raising wastewater, and treating the non-sterilized pig-raising wastewater with bacteria, wherein the sterile pig-raising wastewater and the bacteria-raised pig-raising wastewater are used as culture medium of scenedesmus respectively.
The COD content in the 10-time diluted sterile pig-raising wastewater is 1300mg/L and NH4 +The N content was 114.99mg/L, the TN content was 168.2mg/L and the TP content was 8 mg/L.
The COD value of the wastewater diluted by 10 times and used for the bacteria-bearing pig is 1300mg/L and NH4 +The content of-N is 115mg/L, the content of TN is 170mg/L and the content of TP is 8 mg/L.
Taking the logarithmically grown scenedesmus, and performing treatment according to the ratio of 1.2 × 106And (2) inoculating the strain/mL of strain in the wastewater with the geotextile, wherein the inoculation density is that the strain is inoculated in the wastewater with the geotextile, the illumination intensity of 1000lux is 30 ℃, and the light-dark ratio is 12: 12d, the geotextile carrying the scenedesmus algae is taken out, and the dry weight of the scenedesmus is measured, and the result is shown in figure 1. And biomass productivity was calculated according to the formula. The results are shown in Table 1. Taking the rest wastewater, namely the wastewater after the scenedesmus purification treatment, and detecting COD, TP, TN and NH in the rest wastewater4 +The contents of N, sterile waste water 310, 2.89, 94.15 and 61.23mg/L, respectively, and sterile waste water 170, 2.05, 91.51 and 32.42mg/L, respectively, were calculated, and the corresponding removal rates were calculated. The results are shown in table 1 and fig. 2.
The volume of the scenedesmus culture medium is 150mL, and the container for containing the wastewater is a beaker. The method for measuring the dry weight of scenedesmus comprises the steps of drying the geotextile carrying scenedesmus at 105 ℃ for 2 hours, weighing the weight of the scenedesmus to obtain a value which is the dry weight of scenedesmus, and the result is shown in table 1. The ratio of the geotextile to the bottom area of the beaker is 0.78.
Example 2
Filtering wastewater from pig farm of Dezhou city in Shandong with 2 layers of gauze to obtain filtrate, and centrifuging the filtrate at 8000rpm for 10min to obtain supernatant. Diluting the supernatant with pure water by 20 times, sterilizing at 121 deg.C for 30min to obtain sterile pig-raising wastewater, and sterilizing to obtain sterile pig-raising wastewater as culture medium of Scenedesmus obliquus.
The COD content in the sterile pig-raising wastewater diluted by 20 times is 599.97mg/L, NH4 +Content of-N54.99mg/L, TN content of 85mg/L and TP content of 3.88 mg/L.
The COD content in the pig-raising wastewater diluted by 20 times and having bacteria is 600mg/L and NH4 +The content of-N is 55mg/L, the content of TN is 85mg/L, and the content of TP is 3.96 mg/L.
Taking the logarithmically grown scenedesmus according to the ratio of 0.8 multiplied by 106And (3) inoculating the strain with the inoculation density of one strain/mL in a scenedesmus culture medium with geotextile, and performing culture at the temperature of 20 ℃, the illumination intensity of 1000lux and the light-dark ratio of 12: 12d, the geotextile carrying the scenedesmus algae is taken out, and the dry weight of the scenedesmus is measured, and the result is shown in figure 1. And biomass productivity was calculated according to the formula, and the results are shown in table 1. Taking the rest wastewater, namely the wastewater after the scenedesmus purification treatment, and detecting COD, TP, TN and NH in the rest wastewater4 +The contents of N and sterile pig wastewater were 136.67, 0.15, 33.36 and 16.04mg/L, respectively, and the contents of bacterial pig wastewater were 86.67, 0.23, 35.75 and 16.11mg/L, respectively, and the respective removal rates were calculated. The results are shown in table 1 and fig. 2.
The volume of the scenedesmus culture medium is 150mL, and the container for containing the scenedesmus culture medium is a beaker. The dry weight measurement method comprises the steps of drying the geotextile carrying the scenedesmus algae for 2 hours at 105 ℃, weighing the algae to obtain a numerical value, and the result is shown in table 1. The ratio of the geotextile to the bottom area of the beaker is 0.8.
Table 1 removal rate and adhesion amount obtained in each of examples 1 and 2
FIG. 1 shows that the dry weight of Scenedesmus obliquus cultured with 10-fold dilution of the wastewater from pig cultivation and the dry weight of Scenedesmus obliquus cultured with 20-fold dilution of the wastewater from pig cultivation were at most 57.5 and 62.17mg, respectively, and biomass productivity was 2.03 and 2.20g/m, respectively2/d。
FIG. 2 shows COD, TN, TP, NH4 +The highest removal rates of-N were 86.92%, 60.75%, 96.13% and 71.81%, respectively.
From the above embodiments, the present invention provides a method for purifying swine wastewater by scenedesmus attachment culture. The method can obviously remove COD, TN, TP and NH in the pig-raising wastewater4 +-N content, increasing scenedesmus biomass. In addition, the geotextile attachment material is added into the pig raising wastewater, so that scenedesmus is attached to grow, and scenedesmus can be taken out of the pig raising wastewater more conveniently.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (9)
1. A method for purifying pig-raising wastewater by scenedesmus attachment culture is characterized by comprising the following steps:
inoculating Scenedesmus into the pig raising wastewater, and culturing for 8-12 d;
(ii) the Scenedesmus sp.lx1;
scenedesmus attachment materials are added into the pig raising wastewater.
2. The method of claim 1, wherein the density of the seeding is 0.8 x 106～1.2×106one/mL.
3. The method of claim 1 or 2, wherein the attachment material is geotextile;
the ratio of the area of the geotextile to the bottom area of the container for containing the pig raising wastewater is 0.76-0.8: 1.
4. The method of claim 3, wherein the swine wastewater is diluted swine wastewater;
the dilution multiple is 10-20 times; the dilution is carried out with pure water.
5. The method according to claim 4, wherein the COD value of the pig wastewater before dilution is 11000-13000 mg/L, the ammonia nitrogen content is 1100-1300 mg/L, the total nitrogen content is 1500-1900 mg/L, and the total phosphorus content is 70-90 mg/L.
6. The method according to claim 1, wherein the temperature of the culture is 20 to 30 ℃.
7. The method according to claim 6, wherein the intensity of light for the cultivation is 1000 to 2000 lux.
8. The method according to claim 6 or 7, wherein the light-dark ratio of the culture is 11-13 h: 11-13 h.
9. The method of claim 1, further comprising a scenedesmus collection step;
the collection method comprises the following steps: taking out the adhesive material, and drying for 1.5-2.5 h at the temperature of 100-110 ℃ to obtain the adhesive material.
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| US7575682B2 (en) * | 2003-11-19 | 2009-08-18 | Amcol International Corporation | Contaminant-reactive geocomposite mat and method of manufacture and use |
| CN101565674A (en) * | 2009-05-13 | 2009-10-28 | 清华大学 | Low-nutrition scenedesmus and application thereof in sewage deep treatment |
| CN102219306A (en) * | 2011-03-01 | 2011-10-19 | 太原师范学院 | Novel algae culturing bed |
| CN104528950A (en) * | 2014-12-26 | 2015-04-22 | 宇星科技发展(深圳)有限公司 | Aqueous ecological material filter device with high specific surface area and preparation method thereof |
| CN108285241A (en) * | 2018-01-26 | 2018-07-17 | 河海大学 | A kind of primary treatment processes of piggery wastewater |
| CN112125407A (en) * | 2020-09-25 | 2020-12-25 | 湖北工业大学 | Method for treating pig manure wastewater by using microalgae and application |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7575682B2 (en) * | 2003-11-19 | 2009-08-18 | Amcol International Corporation | Contaminant-reactive geocomposite mat and method of manufacture and use |
| CN101565674A (en) * | 2009-05-13 | 2009-10-28 | 清华大学 | Low-nutrition scenedesmus and application thereof in sewage deep treatment |
| CN102219306A (en) * | 2011-03-01 | 2011-10-19 | 太原师范学院 | Novel algae culturing bed |
| CN104528950A (en) * | 2014-12-26 | 2015-04-22 | 宇星科技发展(深圳)有限公司 | Aqueous ecological material filter device with high specific surface area and preparation method thereof |
| CN108285241A (en) * | 2018-01-26 | 2018-07-17 | 河海大学 | A kind of primary treatment processes of piggery wastewater |
| CN112125407A (en) * | 2020-09-25 | 2020-12-25 | 湖北工业大学 | Method for treating pig manure wastewater by using microalgae and application |
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