CN113149214A - Method for facultative and aerobic co-treatment of kitchen waste fermentation liquor and domestic sewage - Google Patents
Method for facultative and aerobic co-treatment of kitchen waste fermentation liquor and domestic sewage Download PDFInfo
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- 238000000855 fermentation Methods 0.000 title claims abstract description 84
- 230000004151 fermentation Effects 0.000 title claims abstract description 79
- 239000010865 sewage Substances 0.000 title claims abstract description 72
- 239000010806 kitchen waste Substances 0.000 title claims abstract description 69
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000011278 co-treatment Methods 0.000 title description 4
- 239000010802 sludge Substances 0.000 claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 19
- 238000006243 chemical reaction Methods 0.000 claims abstract description 14
- 230000010355 oscillation Effects 0.000 claims abstract description 13
- 239000000203 mixture Substances 0.000 claims abstract description 8
- 239000002002 slurry Substances 0.000 claims description 4
- 230000002195 synergetic effect Effects 0.000 claims description 4
- 239000008367 deionised water Substances 0.000 claims description 3
- 229910021641 deionized water Inorganic materials 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 2
- 238000004537 pulping Methods 0.000 claims description 2
- 230000035484 reaction time Effects 0.000 claims description 2
- 238000004062 sedimentation Methods 0.000 claims description 2
- 239000006228 supernatant Substances 0.000 claims 1
- 238000007599 discharging Methods 0.000 abstract description 6
- 239000000126 substance Substances 0.000 abstract description 6
- 230000007613 environmental effect Effects 0.000 abstract description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 9
- 229910052799 carbon Inorganic materials 0.000 description 9
- 229910002651 NO3 Inorganic materials 0.000 description 6
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 239000010813 municipal solid waste Substances 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 4
- 238000009825 accumulation Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 244000005700 microbiome Species 0.000 description 3
- 239000010794 food waste Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- VMHLLURERBWHNL-UHFFFAOYSA-M Sodium acetate Chemical compound [Na+].CC([O-])=O VMHLLURERBWHNL-UHFFFAOYSA-M 0.000 description 1
- CKUAXEQHGKSLHN-UHFFFAOYSA-N [C].[N] Chemical compound [C].[N] CKUAXEQHGKSLHN-UHFFFAOYSA-N 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 150000001413 amino acids Chemical class 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- WQZGKKKJIJFFOK-VFUOTHLCSA-N beta-D-glucose Chemical compound OC[C@H]1O[C@@H](O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-VFUOTHLCSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
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- 239000008103 glucose Substances 0.000 description 1
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- 235000015097 nutrients Nutrition 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
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- 235000017281 sodium acetate Nutrition 0.000 description 1
- 239000001632 sodium acetate Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Images
Classifications
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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
- C02F3/30—Aerobic and anaerobic processes
- C02F3/301—Aerobic and anaerobic treatment in the same reactor
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/02—Temperature
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/14—NH3-N
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/15—N03-N
Abstract
The invention discloses a method for facultative cooperative treatment of kitchen waste fermentation liquor and domestic sewage, which comprises the following steps: 1) mixing kitchen waste fermentation liquor and domestic sewage in a certain proportion and then placing the mixture in a facultative reactor; 2) and continuously inoculating and domesticating the activated sludge, placing the activated sludge in a constant-temperature constant-humidity oscillation box for reaction, and finally discharging water to realize the cooperative treatment of the kitchen waste fermentation liquor and the domestic sewage. Compared with the prior art, the resource utilization method of the kitchen waste fermentation liquor innovatively provided by the invention has the advantages of simple process and low cost, effectively utilizes easily degradable organic substances in the fermentation liquor to treat domestic sewage, and has higher economic and social environmental benefits.
Description
Technical Field
The invention belongs to the field of kitchen waste treatment and resource utilization, and relates to a method for facultative and aerobic co-treatment of kitchen waste fermentation liquor and domestic sewage.
Background
With the acceleration of urbanization process and the continuous promotion of industrialization level in China, the yield of various wastes in cities and towns is gradually increased. The living standard of people is continuously improved, so that the proportion of wet garbage in the total household garbage is higher and higher, the kitchen garbage is used as the main component of the wet garbage, the organic matter content is high, the components are complex, the consumption and the accumulation are extremely high, and the pollution phenomena such as stink and the like can be caused if the kitchen garbage is not treated in time. At present, the common kitchen waste treatment and recycling technology is mainly anaerobic fermentation for biogas production, a large amount of fermentation liquor containing rich nutrient elements such as nitrogen, phosphorus, potassium and amino acids can be produced in the fermentation process, the fermentation liquor is a high-quality resource, however, the problems that the fermentation liquor cannot be completely consumed due to factors such as high yield and single treatment means are also the waste of the resource.
At present, in the denitrification stage, due to the low carbon-nitrogen ratio of domestic sewage, a carbon source needs to be added from the outside to realize the complete denitrification of the sewage. However, the common external carbon sources such as sodium acetate, glucose, methanol, etc. have disadvantages of high cost and severe transportation conditions, which also hinders the large-scale application of the carbon sources. In addition, the anaerobic condition further amplifies the defect that the adding amount of the conventional carbon source is difficult to control. Too little adding amount can cause insufficient carbon source supply, the denitrification rate is reduced, the effluent quality does not reach the standard, and too much adding amount of the carbon source increases the pollution load, and the effluent COD can exceed the standard. Therefore, it is important to create a sewage and fermentation liquor treatment process which is low in cost, high in efficiency and not easy to cause pollutant accumulation.
Disclosure of Invention
Aiming at solving the problems of high yield, low resource utilization rate, high carbon source cost in the sewage denitrification process, easy accumulation of organic matters and the like of the conventional kitchen waste fermentation liquor, the invention provides a facultative aerobic cooperative treatment method for kitchen waste fermentation liquor and domestic sewage, which has simple process, simultaneously efficiently utilizes easily degradable organic substances in the fermentation liquor as an electron donor to promote the denitrification of the domestic sewage, and has higher economic and social environmental benefits.
The purpose of the invention can be realized by the following technical scheme:
the invention provides a method for facultative cooperative treatment of kitchen waste fermentation liquor and domestic sewage, which comprises the following steps:
step 1), mixing kitchen waste fermentation liquor and domestic sewage in a certain proportion and then placing the mixture in a facultative reactor;
and 2) continuously inoculating the acclimatized activated sludge in the step 1, and placing the activated sludge in a constant temperature and humidity oscillating box for reaction until water is discharged.
Wherein, the step of domesticating the activated sludge comprises the following steps: adding a certain amount of domestic sewage into the conical flask, and connecting with activated sludge to make the sludge concentration of the system about 3000mg/L, adding fermentation liquor and controlling C/N to about 7. Then, fresh domestic sewage and kitchen waste fermentation liquor are replaced every day, and COD and NO are measured by sampling3 --N、NO2 -And (4) obtaining the acclimated activated sludge by the N concentration until the denitrification effect is stable.
Compared with the non-domesticated sludge, the domesticated sludge has the advantages that microorganisms capable of decomposing sewage and fermentation liquor are bred and grown, the microorganisms incapable of adapting to the environment are gradually eliminated, and the proportion of the microorganisms capable of decomposing is increased, so that the domesticated sludge has a better effect of removing organic matters and nitrogen substances and higher removal efficiency.
Further, in the step 1), the kitchen waste fermentation liquor is obtained by subjecting kitchen waste to anaerobic fermentation, centrifuging the kitchen waste by using a centrifuge, taking supernate, and filtering and separating the supernate by using filter paper. The kitchen waste is taken from a student canteen of a university, the concentration of COD in the kitchen waste fermentation liquor is 15000-18000 mg/L, the concentration of VFA is 3000-3400 mg/L, and NH is3The concentration of N is 100-180 mg/L; preferably, the concentration of COD in the kitchen waste fermentation liquor is 16330mg/L, the concentration of VFA is 3159mg/L, and NH is added3The concentration of-N was 104.5 mg/L.
Furthermore, the anaerobic fermentation process of the kitchen waste specifically comprises the following steps:
adding the kitchen waste and deionized water into a crushing stirrer according to the mass ratio of 1: 2-1: 4, pulping to obtain kitchen waste slurry, pouring the kitchen waste slurry into a closed fermentation bottle, placing the fermentation bottle into a constant-temperature constant-humidity oscillation incubator for anaerobic fermentation, wherein the temperature is controlled to be 28-35 ℃ in the anaerobic fermentation process, and carrying out oscillation fermentation for 3-7 days. Preferably, the mass ratio of the kitchen waste to the deionized water is 1: 2; the temperature in the anaerobic fermentation process is controlled to be 30 ℃, and the time of oscillating fermentation is 5 d.
Further, in the step 1), the domestic sewage is taken from a water inlet of a denitrification tank of a sewage treatment plant. The concentration of COD in the domestic sewage is 20-28 mg/L, NH3-N concentration less than 3mg/L, NO3The concentration of N is 42-67 mg/L; preferably, the concentration of COD in the domestic sewage is 25.2mg/L, NH3Concentration of-N1.13 mg/L, NO3The concentration of-N was 50.97 mg/L.
Further, in the step 1), the volume ratio of the kitchen waste fermentation liquor to the domestic sewage is (0.01-0.05): 1; preferably, it is 0.03: 1.
Further, in the step 1), the facultative reactor is a conical flask, a beaker, a round-bottom flask and the like, and a bottle mouth is sealed by a transparent film and a small puncture hole is pricked; preferably, the bottle is a 1L-volume conical bottle, the bottle mouth is sealed by two layers of transparent films, 2-4 small holes are punctured, and the dissolved oxygen solubility of the whole system is controlled to be 0.5-1.5 mg/L.
Further, in the step 1), the kitchen waste fermentation liquor is added mainly for providing electrons required by denitrification, so that after the reaction, the effluent indexes in the step (2) all meet the sewage discharge standard.
Further, in the step 2), the cooperative treatment of the kitchen waste fermentation liquor and the domestic sewage is realized through the reaction effluent.
Further, in the step 2), "effluent" is not water produced by the reaction, but sewage obtained by performing sludge denitrification on the domestic sewage in the step (1).
Further, in the step 2), the activated sludge is obtained from sludge in a secondary sedimentation tank of a sewage treatment plant of white dragon harbor in Shanghai city, and continuously runs for 25-40 d in a facultative reactor with the volume ratio of kitchen waste fermentation liquor to domestic sewage being (0.01-0.05): 1; preferably, the volume ratio of the kitchen waste fermentation liquid to the domestic sewage is 0.03:1, running time 30 d.
Further, in the step 2), the concentration of the activated sludge is controlled to be 3000-3500 mg/L; preferably, 3420 mg/L.
Further, in the step 2), the temperature in the reaction process is controlled to be 33-38 ℃, and the oscillation rotating speed is controlled to be 120-130 rpm; preferably, the temperature of the reaction process is controlled at 35 ℃ and the oscillation speed is 125 rpm.
Further, in the step 2), the reaction time is 8-10 h; preferably, it is 10 h.
The technical difficulties to be overcome by the invention are as follows: the conventional liquid dosage is difficult to accurately control, excessive dosage can cause the effluent COD to exceed the standard, and too little dosage can cause the integral denitrification effect to be insignificant. The invention solves the problems by two aspects of providing carbon source required by denitrification and removing redundant organic substances through facultative treatment by the designed kitchen waste fermentation liquor.
The beneficial effects of the invention include: compared with the prior art, the invention creates a resource utilization method of the kitchen waste fermentation liquor, has simple process and low cost, efficiently utilizes easily degradable organic substances in the fermentation liquor to treat domestic sewage, and has higher economic and social environmental benefits.
Drawings
FIG. 1 is a COD concentration curve of the fermentation liquid of Chinese food waste and domestic sewage after the facultative aerobic synergistic treatment in examples 1-5 of the present invention.
FIG. 2 is a nitrate concentration curve of the fermentation liquid of Chinese food waste and domestic sewage after the facultative aerobic synergistic treatment in examples 1-5 of the present invention.
FIG. 3 is a nitrite concentration curve obtained by performing facultative aerobic co-treatment on kitchen waste fermentation liquid and domestic sewage in examples 1 to 5 of the present invention.
Detailed Description
The invention is further described in detail with reference to the following specific examples and the accompanying drawings. The procedures, conditions, experimental methods and the like for carrying out the present invention are general knowledge and common general knowledge in the art except for the contents specifically mentioned below, and the present invention is not particularly limited.
Example 1
The method for carrying out facultative and aerobic cooperative treatment on the kitchen waste fermentation liquor and the domestic sewage is implemented according to the following steps:
(1) mixing 5ml of fermented kitchen waste fermentation liquor which is fermented for 5 days and is separated by centrifugal filter paper of a centrifugal machine with 500ml of domestic sewage taken from a water inlet of a denitrification tank of a sewage treatment plant of white Longgang harbor in Shanghai, and then placing the mixture into a closed conical flask with 4 holes;
(2) continuously inoculating activated sludge which continuously runs for 30 days in a 4-hole closed conical flask with the volume ratio of the kitchen waste fermentation liquor to the domestic sewage of 0.01:1, controlling the sludge concentration to be 3420mg/L, then placing the conical flask in a constant-temperature constant-humidity oscillation tank with the temperature of 35 ℃ and the rpm of 125 for reaction for 10 hours, and finally discharging water to realize the cooperative treatment of the kitchen waste fermentation liquor and the domestic sewage.
Example 2
The method for carrying out facultative and aerobic cooperative treatment on the kitchen waste fermentation liquor and the domestic sewage is implemented according to the following steps:
(1) mixing 10ml of fermented kitchen waste fermentation liquor which is fermented for 5 days and is separated by centrifugal filter paper of a centrifugal machine with 500ml of domestic sewage taken from a water inlet of a denitrification tank of a sewage treatment plant of white Longgang harbor in Shanghai, and then placing the mixture into a closed conical flask with 4 holes;
(2) continuously inoculating activated sludge which continuously runs for 30 days in a 4-hole closed conical flask with the volume ratio of the kitchen waste fermentation liquor to the domestic sewage of 0.02:1, controlling the sludge concentration to be 3420mg/L, then placing the conical flask in a constant-temperature constant-humidity oscillation tank with the temperature of 35 ℃ and the rpm of 125 for reaction for 10 hours, and finally discharging water to realize the cooperative treatment of the kitchen waste fermentation liquor and the domestic sewage.
Example 3
The method for carrying out facultative and aerobic cooperative treatment on the kitchen waste fermentation liquor and the domestic sewage is implemented according to the following steps:
(1) mixing 15ml of fermented kitchen waste fermentation liquor which is fermented for 5 days and is separated by centrifugal filter paper of a centrifugal machine with 500ml of domestic sewage taken from a water inlet of a denitrification tank of a sewage treatment plant of white Longgang harbor in Shanghai, and then placing the mixture into a closed conical flask with 4 holes;
(2) continuously inoculating activated sludge which continuously runs for 30d in a closed conical flask with 4 holes and with the volume ratio of the kitchen waste fermentation liquor to the domestic sewage of 0.03:1, controlling the sludge concentration to be 3420mg/L, then placing the conical flask into a constant-temperature constant-humidity oscillation tank with the temperature of 35 ℃ and the rpm of 125 for reaction for 10h, and finally discharging water to realize the cooperative treatment of the kitchen waste fermentation liquor and the domestic sewage.
Example 4
The method for carrying out facultative and aerobic cooperative treatment on the kitchen waste fermentation liquor and the domestic sewage is implemented according to the following steps:
(1) mixing 20ml of fermented kitchen waste fermentation liquor which is fermented for 5 days and is separated by centrifugal filter paper of a centrifugal machine with 500ml of domestic sewage taken from a water inlet of a denitrification tank of a sewage treatment plant of white Longgang harbor in Shanghai, and then placing the mixture into a closed conical flask with 4 holes;
(2) continuously inoculating activated sludge which continuously runs for 30 days in a 4-hole closed conical flask with the volume ratio of the kitchen waste fermentation liquor to the domestic sewage of 0.04:1, controlling the sludge concentration to be 3420mg/L, then placing the conical flask in a constant-temperature constant-humidity oscillation tank with the temperature of 35 ℃ and the rpm of 125 for reaction for 10 hours, and finally discharging water to realize the cooperative treatment of the kitchen waste fermentation liquor and the domestic sewage.
Example 5
The method for carrying out facultative and aerobic cooperative treatment on the kitchen waste fermentation liquor and the domestic sewage is implemented according to the following steps:
(1) mixing 25ml of fermented kitchen waste fermentation liquor which is fermented for 5 days and is separated by centrifugal filter paper of a centrifugal machine with 500ml of domestic sewage taken from a water inlet of a denitrification tank of a sewage treatment plant of white Longgang harbor in Shanghai, and then placing the mixture into a closed conical flask with 4 holes;
(2) continuously inoculating activated sludge which continuously runs for 30 days in a 4-hole closed conical flask with the volume ratio of the kitchen waste fermentation liquor to the domestic sewage of 0.05:1, controlling the sludge concentration to be 3420mg/L, then placing the conical flask in a constant-temperature constant-humidity oscillation tank with the temperature of 35 ℃ and the rpm of 125 for reaction for 10 hours, and finally discharging water to realize the cooperative treatment of the kitchen waste fermentation liquor and the domestic sewage.
The effluent of the embodiment 1-5 of the invention is sampled every 1 hour and the concentrations of COD, nitrate and nitrite are measured, and the final detection result is shown in figures 1-3. As can be seen from the graphs 1 to 3, the removal effect of the nitrate is continuously improved along with the increase of the volume ratio of the kitchen waste fermentation liquor to the domestic sewage. When the volume ratio of the kitchen waste fermentation liquor to the domestic sewage is 0.05:1, the concentration of nitrate can be greatly reduced within 3 hours, and the removal rate exceeds 96 percent; in addition, after the nitrite concentration reaches the peak value in the previous period, the nitrite concentration is continuously reduced to below 1mg/L within 4 hours, and the phenomenon of nitrite accumulation does not occur in effluent; the COD value of the effluent is not accumulated and is reduced to be within 20mg/L within 6h, and the final removal rate reaches 99 percent. The results also show that the synergistic treatment of the kitchen waste fermentation liquor and the domestic sewage under the facultative anaerobic condition in the embodiment can not only realize high-efficiency denitrification, but also can not increase the organic load of the effluent.
According to the embodiment, the invention provides the method for the facultative anaerobic cooperative treatment of the kitchen waste fermentation liquor and the domestic sewage, and can solve the problems that the existing kitchen waste fermentation liquor has large storage capacity, the resource utilization rate in the treatment process is low, the cost of the sewage denitrification carbon source is high, the COD of the effluent is easy to exceed the standard and the like. The method is simple, has low cost, can realize the high-efficiency utilization of the easily degradable organic substances in the fermentation liquor, and has higher economic and social environmental benefits.
The protection of the present invention is not limited to the above embodiments. Variations and advantages that may occur to those skilled in the art may be incorporated into the invention without departing from the spirit and scope of the inventive concept, and the scope of the appended claims is intended to be protected.
Claims (10)
1. A facultative aerobic synergistic treatment method for kitchen waste fermentation liquor and domestic sewage is characterized by comprising the following steps:
step 1), mixing kitchen waste fermentation liquor and domestic sewage in a certain proportion and then placing the mixture in a facultative reactor;
and 2) continuously inoculating the acclimatized activated sludge in the step 1, and placing the activated sludge in a constant temperature and humidity oscillating box for reaction until water is discharged.
2. The method according to claim 1, wherein in the step 1), the kitchen waste fermentation liquor is obtained by anaerobic fermentation of kitchen waste, centrifuging by a centrifuge to obtain supernatant, and filtering and separating by filter paper; the concentration of COD in the kitchen waste fermentation liquor is 15000-18000 mg/L, the concentration of VFA is 3000-3400 mg/L, and NH is added3The concentration of-N is 100-180 mg/L.
3. The method according to claim 2, wherein the anaerobic fermentation process of the kitchen waste is specifically as follows:
adding the kitchen waste and deionized water into a crushing stirrer according to the mass ratio of 1: 2-1: 4, pulping to obtain kitchen waste slurry, pouring the kitchen waste slurry into a closed fermentation bottle, placing the fermentation bottle into a constant-temperature constant-humidity oscillation incubator for anaerobic fermentation, wherein the temperature is controlled to be 28-35 ℃ in the anaerobic fermentation process, and carrying out oscillation fermentation for 3-7 days.
4. The method according to claim 1), wherein in the step 1), the domestic sewage is taken from a water inlet of a denitrification tank of a sewage treatment plant, the concentration of COD in the domestic sewage is 20-28 mg/L, and NH is added3-N concentration less than 3mg/L, NO3The concentration of-N is 42-67 mg/L.
5. The method according to claim 1, wherein in the step 1), the volume ratio of the kitchen waste fermentation liquor to the domestic sewage is (0.01-0.05): 1.
6. The method according to claim 1, wherein in the step 1), the facultative reactor comprises a conical flask, a beaker and a round-bottom flask, and the mouth of the flask is sealed by a transparent film and pricked with 2-4 small holes.
7. The method according to claim 1, wherein in the step 2), the activated sludge is sludge in a secondary sedimentation tank of a sewage treatment plant, and the activated sludge is continuously operated for 25-40 days in a facultative reactor in which the volume ratio of kitchen waste fermentation liquor to domestic sewage is (0.01-0.05): 1.
8. The method according to claim 1, wherein in the step 2), the concentration of the activated sludge is controlled to be 3000-3500 mg/L.
9. The method as claimed in claim 1, wherein in the step 2), the temperature of the reaction process is controlled to be 33-38 ℃, and the oscillation speed is controlled to be 120-130 rpm.
10. The method according to claim 1, wherein in the step 2), the reaction time is 8-10 h.
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| CN104724828A (en) * | 2015-03-31 | 2015-06-24 | 成都信息工程学院 | Synchronous nitrification and denitrification coupled dephosphorization method for domestic sewage with low carbon nitrogen ratio |
| CN109052648A (en) * | 2018-09-12 | 2018-12-21 | 中钢集团天澄环保科技股份有限公司 | Sewage combination treatment method and device in a kind of region |
| CN111333179A (en) * | 2020-03-17 | 2020-06-26 | 北京科技大学 | Method for producing wastewater denitrification carbon source by lactic acid fermentation of kitchen waste |
| CN111470629A (en) * | 2020-04-17 | 2020-07-31 | 西安建筑科技大学 | Facultative active sludge sewage treatment method |
| CN112573781A (en) * | 2020-12-29 | 2021-03-30 | 湖北君集水处理有限公司 | Synergistic treatment system and treatment method for performing nitrogen and phosphorus removal on low C/N sewage by using kitchen waste hydrolysis acidification liquid |
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