CN115557625A - Rapid starting method of preserved szechuan pickle wastewater sludge by taking preserved szechuan pickle sludge with 1.2% salinity as inoculation system - Google Patents
Rapid starting method of preserved szechuan pickle wastewater sludge by taking preserved szechuan pickle sludge with 1.2% salinity as inoculation system Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 30
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- XPPKVPWEQAFLFU-UHFFFAOYSA-J diphosphate(4-) Chemical compound [O-]P([O-])(=O)OP([O-])([O-])=O XPPKVPWEQAFLFU-UHFFFAOYSA-J 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
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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- C02F3/28—Anaerobic digestion processes
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- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/32—Nature of the water, waste water, sewage or sludge to be treated from the food or foodstuff industry, e.g. brewery waste waters
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F2209/05—Conductivity or salinity
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Abstract
The invention relates to a quick starting method of tuber mustard wastewater sludge by taking tuber mustard sludge with 1.2% salinity as an inoculation system, belonging to the technical field of wastewater treatment. The method mainly comprises the following steps: inoculating tuber mustard sludge with 1.2% salinity into a tuber mustard wastewater reactor with hydrolysis acidification-A/A/O as a main body, culturing and proliferating the inoculated sludge, and acclimatizing and debugging the process operation process to periodically and synchronously increase pollutant load and reduce salinity load. The method can ensure the adaptability of a microbial system of the reactor, realize the quick start of the reactor, quickly reach the designed water inlet load, ensure the stable operation of the system, realize the high-efficiency treatment of the preserved szechuan pickle wastewater, and ensure that the treated effluent meets the discharge standard executed since 2025 in DB 50/1050-2020 Water pollutant discharge Standard of the preserved szechuan pickle industry, wherein the chloride ion is required to be not more than 5000mg/L (namely, the salinity is 0.82%).
Description
Technical Field
The invention belongs to the technical field of wastewater treatment, and particularly relates to a quick starting method of tuber mustard wastewater sludge by taking tuber mustard sludge with 1.2% salinity as an inoculation system, which can periodically and synchronously improve pollutant load and reduce salinity load, can quickly reach design working conditions and run stably, and treated effluent meets the discharge standard executed since 2025 in DB 50/1050-2020 Water pollutant discharge Standard of tuber mustard industry.
Background
The planting and processing of the hot pickled mustard tuber is an agricultural pillar type industry in the three gorges reservoir area, and hot pickled mustard tuber waste water is generated in the pickling processing process of the hot pickled mustard tuber. The preserved szechuan pickle wastewater is used as special food processing salt-containing wastewater and has the characteristics of high salinity, high organic matter concentration, high nitrogen and phosphorus concentration, large amount of generated products, irregular discharge and the like. The preserved szechuan pickle waste water can pollute soil and water if being discharged into the environment without being effectively treated. At present, various kinds of salt-containing wastewater and tuber mustard wastewater are researched more, and a physicochemical, biochemical and comprehensive treatment system is involved. The economic efficiency of the evaporation crystallization desalination and the membrane filtration desalination in the practical application is not enough due to the higher construction and operation and maintenance cost; the biochemical treatment has better economy due to better biodegradability of the preserved szechuan pickle wastewater.
At present, the preserved szechuan pickle wastewater treatment engineering matched with and constructed by preserved szechuan pickle production enterprises mostly executes the primary standard of Integrated wastewater discharge Standard GB 8978-1996, the main processes capable of ensuring standard discharge all contain a two-phase anaerobic-aerobic core unit combination, are mainly used for removing COD and ammonia nitrogen, and basically do not relate to the denitrification function. The discharge standard of water pollutants in the tuber mustard industry DB 50/1050-2020 fills the blank of the discharge standard of water pollutants in the tuber mustard industry, increases the requirement on total nitrogen and chloride ion indexes, puts forward a new requirement on a tuber mustard wastewater treatment plant, increases a denitrification function on the basis of the existing tuber mustard wastewater treatment process, redistributes a carbon source, and effectively removes pollutants under the salinity load required by the standard.
At present, during debugging and commissioning of preserved szechuan pickle wastewater treatment engineering, sludge culture is basically performed by inoculating dewatered sludge or return sludge of a municipal sewage treatment plant, process debugging is performed by two stages of gradually increasing salinity load and gradually increasing pollutant load, and the debugging period is long. If the dewatered sludge or the return sludge of the existing preserved szechuan pickle wastewater treatment project is used for inoculation, the difference between the salinity of the inoculated sludge and the target salinity can be reduced, the adaptability of the sludge is improved, the pollutant load is periodically and synchronously increased, the salinity load is reduced, the quick start of the preserved szechuan pickle wastewater sludge can be realized, and the method has important significance on the actual project scale operation of the preserved szechuan pickle wastewater.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a method for quickly starting tuber mustard wastewater sludge by taking tuber mustard sludge with 1.2 percent of salinity as an inoculation system, which is characterized in that tuber mustard sludge with 1.2 percent of salinity is inoculated into a tuber mustard wastewater reactor mainly comprising coagulating sedimentation, hydrolytic acidification, A/A/O-dephosphorization precipitation, the pollutant load is periodically and synchronously increased and the salinity load is reduced in the process of process operation, the adaptability of a microbial system of the reactor is enhanced, the stable operation of the system is ensured, the quick start of the reactor is realized, the designed water inlet load is quickly reached, the efficient treatment of the tuber mustard wastewater is realized, and the treated effluent meets the discharge standard executed from 2025 years to DB 50/1050-2020 Water pollutant discharge Standard of the tuber mustard industry.
Description of terms:
and (3) hot pickled mustard tuber wastewater: the waste water from the production of hot pickled mustard tuber is the by-product of hot pickled mustard tuber.
COD: chemical oxygen demand, which is the amount of reducing substances to be oxidized in a water sample measured chemically.
TN: the total of organic nitrogen, ammonia nitrogen, nitrite nitrogen and nitrate nitrogen in water.
Ammonia nitrogen: ammonia nitrogen refers to ammonia in the form of free ammonia or ionic ammonia.
TP: the total phosphorus refers to the content of phosphorus in water, and mainly exists in the forms of orthophosphate, condensed phosphate, pyrophosphate, metaphosphate, organic group-bonded phosphate and the like.
A hydrolysis acidification pool: microorganisms complete biocatalytic hydrolysis reactions by releasing extracellular free enzymes or immobilized enzymes attached to the outer cell wall, with the metabolites of the microorganisms being primarily various organic acids.
A/A/O pool: a common secondary sewage treatment process with synchronous denitrification and dephosphorization functions
MLSS: the mixed solution suspended solids concentration.
Hydraulic retention time: average residence time of wastewater in the reactor.
The technical scheme of the invention is as follows:
a quick starting method of preserved szechuan pickle wastewater sludge by taking preserved szechuan pickle sludge with 1.2 percent of salinity as an inoculation system mainly comprises the following steps:
step 1: the method comprises the following steps of inoculating tuber mustard sludge with 1.2% of salinity into a tuber mustard wastewater reactor taking hydrolytic acidification-A/A/O as a main body;
step 2: adding tuber mustard wastewater to culture and proliferate the sludge in the step 1;
and step 3: the process runs, periodically and synchronously promotes pollutant load and reduces salinity load, ensures the adaptability of a microbial system of the reactor, realizes quick start of the reactor, quickly achieves designed water inlet load, ensures stable operation of the system, and realizes efficient treatment of the preserved szechuan pickle wastewater.
According to the invention, the main process of the preserved szechuan pickle wastewater treatment reactor in the step 1 is 'hydrolytic acidification + A/A/O', and the process comprises the following process unit combinations: an adjusting tank, a coagulating sedimentation tank, a hydrolysis acidification tank, an intermediate sedimentation tank, an A/A/O tank, a secondary sedimentation tank and a dephosphorization sedimentation tank.
According to the invention, preferably, the pH value of the hydrolysis acidification tank is 6.5-7.0, and the COD influent volume load is 1.4-5.0 kgCOD/(m) 3 D) the hydraulic retention time is 10 to 16h.
According to the invention, the reflux ratio of the sludge in the A/A/O pool is 60-100%, the reflux ratio of the nitrifying liquid is 200-400%, and the MLSS is 4000-6000 mg/L. The concentration of dissolved oxygen in the anaerobic pool is lower than 0.2mg/L, and the hydraulic retention time is 3-5 h; the concentration of dissolved oxygen in the anoxic tank is lower than 0.5mg/L, and the hydraulic retention time is 8-12 h; the concentration of dissolved oxygen in the aerobic pool is 2.0-3.5 mg/L, and the hydraulic retention time is 19-30 h.
According to the invention, the concentration of COD, TN, ammonia nitrogen, TP and chloride ions in the hot pickled mustard tuber waste water in the step 1 is preferably 2000-3000, 160-240, 72-108, 24-36 and 5000mg/L respectively.
According to the present invention, it is preferable that the activated sludge inoculated in step 1 is obtained from the residual dewatered sludge of a mustard wastewater treatment plant, and the initial salinity is about 1.2%.
According to the invention, the hydrolyzed and acidified sludge in the step 1 is preferably obtained from returned sludge of a hydrolysis and acidification tank of a preserved szechuan pickle wastewater treatment plant, and the initial salinity is about 1.2 percent.
According to the invention, preferably, the organic load of the activated sludge is controlled to be 0.3-0.5 kgCOD/(kgMLSS. D) by adding the tuber mustard wastewater in the step 2, the dissolved oxygen is 2.0-3.5 mg/L, and the salinity is kept to be 1.2%.
According to the invention, preferably, the volume load of the hydrolytic acidification sludge is controlled to be 1.0-1.2 kgCOD/(m) by adding the preserved szechuan pickle wastewater in the step 2 3 D) the stirring rate is 60r/min and the salinity is maintained at 1.2%.
According to the invention, preferably, the amplitude of the periodic lifting of the pollutant load is about 25%, the gradient of the periodic reduction of the salinity is about 0.1%, and the water enters the next period after the load is lifted and stabilized each time, so that the designed inflow water quality is finally achieved. The design inlet water quality in each period is shown in the following table (unit: mg/L):
| period of time | COD | TN | Ammonia nitrogen | TP | Chloride ion |
| 1 | 1024 | 82 | 37 | 12 | 7282 |
| 2 | 1280 | 102 | 46 | 15 | 6675 |
| 3 | 1600 | 128 | 58 | 19 | 6068 |
| 4 | 2000 | 160 | 72 | 24 | 5462 |
| 5 | 2500 | 200 | 90 | 30 | 5000 |
Compared with the prior art, the invention has the beneficial effects that:
1. the invention enhances the adaptability of the biological treatment microorganisms by inoculating the dewatered sludge or the return sludge of the prior preserved szechuan pickle wastewater treatment project.
2. On the basis of the existing preserved szechuan pickle sludge inoculation system, the invention periodically and synchronously promotes pollutant load and reduces salinity load, and accelerates the starting speed of the preserved szechuan pickle wastewater treatment biochemical system.
3. The preserved szechuan pickle wastewater treatment system constructed by the invention meets the discharge standard executed since 2025 in DB 50/1050-2020 Water pollutant discharge Standard of preserved szechuan pickle industry, and has important significance for filling the blank for promoting the coordinated and sustainable development of the preserved szechuan pickle industry and environmental protection.
Drawings
FIG. 1 is a schematic diagram of a pilot scale laboratory apparatus in an embodiment of the present invention.
FIG. 2 is a schematic flow diagram of a pilot scale laboratory apparatus in an embodiment of the present invention.
FIG. 3 is a diagram showing the effect of removing COD in each cycle in the example of the present invention.
Fig. 4 is a diagram illustrating the TN removal effect in each period according to the embodiment of the present invention.
FIG. 5 is a diagram of the ammonia nitrogen removal effect in each cycle of the embodiment of the invention.
FIG. 6 is a diagram illustrating the effect of removing TP for each period according to the embodiment of the present invention.
Detailed Description
The present invention will be further described by way of examples, but not limited thereto, with reference to the accompanying drawings. The reagents and instruments used in the examples are not indicated by the manufacturer, and are conventional products commercially available.
Examples
After investigation, the design water quality of the inlet water for treating the preserved szechuan pickle wastewater is determined as follows: the COD, TN, ammonia nitrogen, TP and chloride ion concentrations were about 2500, 200, 90, 30 and 5000mg/L, respectively.
The laboratory pilot-scale device for the preserved szechuan pickle wastewater adopts a process of 'coagulating sedimentation-hydrolytic acidification-A/A/O-dephosphorization sedimentation' as a main body, comprises an adjusting tank, a coagulating sedimentation tank, a hydrolytic acidification tank, an intermediate sedimentation tank, an A/A/O tank, a secondary sedimentation tank, a dephosphorization sedimentation tank and the like, and is used for treating the preserved szechuan pickle wastewater with designed water quality. The device is schematically shown in figure 1, and the flow chart is schematically shown in figure 2. The daily treatment capacity of the device is 60L/d, and the treatment reaches the emission standard executed since 2025 in DB 50/1050-2020 Water pollutant emission Standard of mustard tuber industry.
The device is used as a reactor, and the preserved szechuan pickle sludge with 1.2 percent of salinity is used as an inoculation system to quickly start the preserved szechuan pickle wastewater sludge, and comprises the following steps:
step 1: the tuber mustard sludge with 1.2 percent of salinity is inoculated into the tuber mustard wastewater reactor taking hydrolytic acidification-A/A/O as a main body.
Step 2: and (3) adding the preserved szechuan pickle wastewater to culture and proliferate the sludge in the step (1).
And step 3: the process runs, periodically and synchronously promotes pollutant load and reduces salinity load, ensures the adaptability of a microbial system of the reactor, realizes quick start of the reactor, quickly achieves designed water inlet load, ensures stable operation of the system, and realizes efficient treatment of the preserved szechuan pickle wastewater.
In the step 1, the activated sludge is inoculated into the excess sludge in a CASS tank of a certain tuber mustard wastewater treatment plant in Chongqing, and the initial salinity of the sludge is about 1.22 percent; the hydrolyzed and acidified sludge is inoculated into the return sludge of a hydrolyzed and acidified tank of a certain preserved szechuan pickle wastewater treatment plant in Chongqing, and the initial salinity is about 1.25 percent.
In the step 2, the organic load of the activated sludge is controlled to be 0.3-0.5 kgCOD/(kgMLSS. D), the dissolved oxygen is controlled to be 2.0-3.5 mg/L, and the salinity is kept to be about 1.2%. Controlling the volume load of the hydrolyzed and acidified sludge to be 1.0-1.2 kgCOD/(m) 3 D) the stirring rate is 60r/min and the salinity is maintained at about 1.2%.
In the step 3, the amplitude of periodically increasing the pollutant load is about 25%, the gradient of periodically decreasing the salinity is about 0.1%, the load is increased each time and then stabilized, and then the next period is carried out, and finally the designed inflow water quality is achieved. The design inlet water quality in each period is shown in the following table (unit: mg/L):
| period of time | COD | TN | Ammonia nitrogen | TP | Chloride ion |
| 1 | 1024 | 82 | 37 | 12 | 7282 |
| 2 | 1280 | 102 | 46 | 15 | 6675 |
| 3 | 1600 | 128 | 58 | 19 | 6068 |
| 4 | 2000 | 160 | 72 | 24 | 5462 |
| 5 | 2500 | 200 | 90 | 30 | 5000 |
In the step 3, the pH value of the hydrolysis acidification tank is 6.5-7.0, the COD inlet water volume load is 1.4-5.0 kgCOD/(m) 3 D) a hydraulic retention time of about 13h.
In the step 3, the reflux ratio of the sludge in the A/A/O pool is about 100 percent, the reflux ratio of the nitrifying liquid is about 300 percent, and the MLSS is about 4500mg/L. The concentration of dissolved oxygen in the anaerobic tank is lower than 0.2mg/L, and the hydraulic retention time is about 4h; the concentration of dissolved oxygen in the anoxic tank is lower than 0.5mg/L, and the hydraulic retention time is about 10h; the concentration of dissolved oxygen in the aerobic pool is about 3.5mg/L, and the hydraulic retention time is about 24h.
The method according to the embodiment is used for treating the preserved szechuan pickle wastewater with different periods of inflow water quality, the designed inflow load can be quickly reached, the quick start of the reactor is realized, the total removal rates of COD, TN, ammonia nitrogen and TP of the preserved szechuan pickle wastewater with the designed target water quality are respectively about 98%, 88%, 98% and 99%, the schematic treatment effect is shown in figures 3-6, the effluent indexes can meet the emission requirements executed in 2025 years in the preserved szechuan pickle industry water pollutant emission standard DB 50/1050-2020, the system is stable in operation, and the treatment is efficient.
The above description is illustrative of the present invention and its embodiments, and is not to be construed as limiting, and the embodiments or figures shown in the drawings are only one embodiment of the present invention and are not intended to be limiting. Therefore, if the person skilled in the art receives the teaching, without departing from the spirit of the invention, the person skilled in the art shall not inventively design the similar structural modes and embodiments to the technical solution, but shall fall within the scope of the invention.
Claims (12)
1. A quick starting method of preserved szechuan pickle wastewater sludge by taking preserved szechuan pickle sludge with 1.2 percent of salinity as an inoculation system mainly comprises the following steps:
step 1: the method comprises the following steps of inoculating tuber mustard sludge with 1.2% of salinity into a tuber mustard wastewater reactor taking hydrolytic acidification-A/A/O as a main body;
step 2: adding tuber mustard wastewater to culture and proliferate the sludge in the step 1;
and step 3: the process runs, periodically and synchronously promotes pollutant load and reduces salinity load, ensures the adaptability of a microbial system of the reactor, realizes quick start of the reactor, quickly achieves designed water inlet load, ensures stable operation of the system, and realizes efficient treatment of the preserved szechuan pickle wastewater.
2. The preserved szechuan pickle wastewater treatment reactor according to claim 1, wherein the main process is "hydrolytic acidification + A/A/O", and the following process unit combination is included in the scope of the claims: an adjusting tank, a coagulating sedimentation tank, a hydrolysis acidification tank, an intermediate sedimentation tank, an A/A/O tank, a secondary sedimentation tank and a dephosphorization sedimentation tank.
3. The hydrolysis acidification tank of claim 1, wherein the pH value of the hydrolysis acidification tank is 6.5 to 7.0, and the COD influent volume load is 1.4 to 5.0 kgCOD/(m) 3 D) the hydraulic retention time is 10 to 16h.
4. The A/A/O pool of claim 1, which consists of an anaerobic pool, an anoxic pool and an aerobic pool, wherein the reflux ratio of sludge in the A/A/O pool is 60-100%, the reflux ratio of nitrifying liquid is 200-400%, and MLSS is 4000-6000 mg/L.
5. The anaerobic pond according to claim 4, wherein the dissolved oxygen concentration is less than 0.2mg/L and the hydraulic retention time is 3-5 h.
6. The anoxic tank of claim 4 wherein the dissolved oxygen concentration is less than 0.5mg/L and the hydraulic retention time is 8 to 12 hours.
7. The aerobic tank as claimed in claim 4, wherein the dissolved oxygen concentration is 2.0-3.5 mg/L and the hydraulic retention time is 19-30 h.
8. The preserved szechuan pickle wastewater of claim 1, wherein the preserved szechuan pickle wastewater has COD, TN, ammonia nitrogen, TP and chloride ion concentrations of 2000-3000, 160-240, 72-108, 24-36 and 5000mg/L respectively.
9. The inoculated sludge according to claim 1, wherein the activated sludge is obtained from residual dewatered sludge of a mustard wastewater treatment plant, and the initial salinity is about 1.2%; the hydrolysis acidification sludge is obtained from return sludge of a hydrolysis acidification pool of a preserved szechuan pickle wastewater treatment plant, and the initial salinity is about 1.2 percent.
10. The sludge culture increment of step 2 in the claim 1, wherein the organic load of the activated sludge is controlled to be 0.3-0.5 kgCOD/(kgMLSS-d), the dissolved oxygen is 2.0-3.5 mg/L, and the salinity is kept to be 1.2%.
11. Sludge culture increment as in step 2 of claim 1, characterized in that the volume load of the hydrolytic acidification sludge is controlled to be 1.0-1.2 kgCOD/(m) 3 D) the stirring rate is about 60r/min, the salinity is maintained at 1.2%.
12. The process run of step 3 of claim 1, wherein the contaminant load is periodically increased by an amount of about 25%; meanwhile, the salinity load is periodically reduced, the salinity gradient is reduced by about 0.1 percent, and finally the designed inflow water quality is achieved. After the load is lifted each time, the next cycle is entered, and the water quality of the inlet water is designed in each cycle and is shown in the following table (unit: mg/L).
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| CN101717153A (en) * | 2009-12-04 | 2010-06-02 | 重庆大学 | Fast construction method of high-salt wastewater biological treatment system |
| CN107601663A (en) * | 2017-10-25 | 2018-01-19 | 南京绿岛环境工程有限公司 | A kind of method of preserved szechuan pickle waste water anaerobic biological culturing sludge |
| CN112537883A (en) * | 2020-12-04 | 2021-03-23 | 重庆市生态环境科学研究院 | Coupled high-salinity wastewater recycling treatment process for pickled mustard tuber |
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| CN101717153A (en) * | 2009-12-04 | 2010-06-02 | 重庆大学 | Fast construction method of high-salt wastewater biological treatment system |
| CN107601663A (en) * | 2017-10-25 | 2018-01-19 | 南京绿岛环境工程有限公司 | A kind of method of preserved szechuan pickle waste water anaerobic biological culturing sludge |
| CN112537883A (en) * | 2020-12-04 | 2021-03-23 | 重庆市生态环境科学研究院 | Coupled high-salinity wastewater recycling treatment process for pickled mustard tuber |
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