CN114956474B - Biochemical combination method for treating PVA-containing printing and dyeing wastewater - Google Patents
Biochemical combination method for treating PVA-containing printing and dyeing wastewater Download PDFInfo
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- 239000002351 wastewater Substances 0.000 title claims abstract description 75
- 238000004043 dyeing Methods 0.000 title claims abstract description 69
- 238000000034 method Methods 0.000 title claims abstract description 42
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 54
- 239000010802 sludge Substances 0.000 claims abstract description 48
- 230000020477 pH reduction Effects 0.000 claims abstract description 30
- 230000007062 hydrolysis Effects 0.000 claims abstract description 19
- 238000006460 hydrolysis reaction Methods 0.000 claims abstract description 19
- 238000011081 inoculation Methods 0.000 claims abstract description 5
- 230000014759 maintenance of location Effects 0.000 claims description 20
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 15
- 238000006243 chemical reaction Methods 0.000 claims description 14
- 230000003301 hydrolyzing effect Effects 0.000 claims description 11
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims description 7
- 229910052757 nitrogen Inorganic materials 0.000 claims description 7
- 238000004062 sedimentation Methods 0.000 claims description 7
- 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 claims description 6
- 229920002472 Starch Polymers 0.000 claims description 6
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- 230000000694 effects Effects 0.000 claims description 6
- 239000008103 glucose Substances 0.000 claims description 6
- 239000001301 oxygen Substances 0.000 claims description 6
- 229910052760 oxygen Inorganic materials 0.000 claims description 6
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- 235000019698 starch Nutrition 0.000 claims description 6
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- 229910000402 monopotassium phosphate Inorganic materials 0.000 claims 2
- 235000019796 monopotassium phosphate Nutrition 0.000 claims 2
- GNSKLFRGEWLPPA-UHFFFAOYSA-M potassium dihydrogen phosphate Chemical compound [K+].OP(O)([O-])=O GNSKLFRGEWLPPA-UHFFFAOYSA-M 0.000 claims 2
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- 238000012423 maintenance Methods 0.000 abstract description 2
- 238000004065 wastewater treatment Methods 0.000 abstract description 2
- 229940079593 drug Drugs 0.000 abstract 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 43
- 229920002451 polyvinyl alcohol Polymers 0.000 description 43
- 230000015271 coagulation Effects 0.000 description 8
- 238000005345 coagulation Methods 0.000 description 8
- 239000000945 filler Substances 0.000 description 8
- 229920003023 plastic Polymers 0.000 description 8
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- 231100000719 pollutant Toxicity 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 239000002054 inoculum Substances 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 239000007800 oxidant agent Substances 0.000 description 2
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- 238000001556 precipitation Methods 0.000 description 2
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- 244000025254 Cannabis sativa Species 0.000 description 1
- 235000012766 Cannabis sativa ssp. sativa var. sativa Nutrition 0.000 description 1
- 235000012765 Cannabis sativa ssp. sativa var. spontanea Nutrition 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- MKYBYDHXWVHEJW-UHFFFAOYSA-N N-[1-oxo-1-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propan-2-yl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(C(C)NC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 MKYBYDHXWVHEJW-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002306 biochemical method Methods 0.000 description 1
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- 235000009120 camo Nutrition 0.000 description 1
- 235000005607 chanvre indien Nutrition 0.000 description 1
- 230000001112 coagulating effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000011487 hemp Substances 0.000 description 1
- 231100000086 high toxicity Toxicity 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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- 239000002957 persistent organic pollutant Substances 0.000 description 1
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- 238000004064 recycling Methods 0.000 description 1
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- 238000004904 shortening Methods 0.000 description 1
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- 230000001988 toxicity Effects 0.000 description 1
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
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/1205—Particular type of activated sludge processes
- C02F3/121—Multistep treatment
-
- C—CHEMISTRY; METALLURGY
- 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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- 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
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/34—Organic compounds containing oxygen
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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
- C02F2103/30—Nature of the water, waste water, sewage or sludge to be treated from the textile industry
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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
- C02F2203/00—Apparatus and plants for the biological treatment of water, waste water or sewage
- C02F2203/006—Apparatus and plants for the biological treatment of water, waste water or sewage details of construction, e.g. specially adapted seals, modules, connections
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/14—NH3-N
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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
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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- Hydrology & Water Resources (AREA)
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Biodiversity & Conservation Biology (AREA)
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- Activated Sludge Processes (AREA)
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Abstract
The invention discloses a biochemical combination method for treating PVA-containing printing and dyeing wastewater, and relates to the technical field of wastewater treatment. The biochemical combination method for treating PVA-containing printing and dyeing wastewater comprises four steps of seed mud inoculation, biological film formation of a biological filter reactor, connection and starting of the biological filter reactor and stable operation of a system. The biochemical combination method for treating the PVA-containing printing and dyeing wastewater improves the biochemical treatment efficiency of the PVA-containing printing and dyeing wastewater, abandons a pretreatment link, shortens the treatment process flow of the PVA-containing printing and dyeing wastewater, reduces the increase of the salt content of water quality caused by adding drugs, does not generate chemical sludge, and effectively prevents secondary pollution; the invention reduces the discharge of secondary pollution gas of the hydrolysis acidification tank, does not need to install a gas collecting and treating device, slows down the corrosion phenomenon of pipe fittings such as pipelines and the like, and saves maintenance cost.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a biochemical combination method for treating PVA-containing printing and dyeing wastewater.
Background
The printing and dyeing wastewater is wastewater discharged from a printing and dyeing mill mainly used for processing cotton, hemp and chemical fiber and blended products thereof. The method has the characteristics of large drainage, large chromaticity, high organic pollutant content, large variety, large alkalinity, large water quality change and the like, and belongs to one of industrial wastewater which is difficult to treat. PVA, namely polyvinyl alcohol, is the main raw material for fabric sizing, except that most PVA can be recovered and reused in the production process, and a small amount of PVA can be discharged into a wastewater pipeline to enter a sewage treatment part for treatment. PVA itself has the characteristics of large COD value, poor biodegradability, large viscosity, easy bubble generation and the like, and the PVA can increase the treatment difficulty of raw water of printing and dyeing wastewater.
At present, pretreatment (chemical coagulation), hydrolytic acidification, aerobic biological-advanced treatment (chemical coagulation/strong oxidizer/sand filtration and the like) is mainly adopted in the treatment process of PVA-containing printing and dyeing wastewater in China. The conventional theory considers that the raw water containing PVA printing and dyeing wastewater cannot be directly utilized by microorganisms (can not be directly treated by a biochemical method) due to complex water quality components and high toxicity, so that partial pollutants in the PVA printing and dyeing wastewater are removed by coagulation pretreatment, the toxicity of the wastewater is reduced (to meet the microbial tolerance requirement of a subsequent aerobic biochemical section), the pH value of the water is optimally regulated, the water enters the biochemical section for effective treatment, and the treated water meets the standard and is discharged after the advanced treatment.
In the prior art, a large amount of coagulating chemical agents are added in the operation process of the pretreatment (chemical coagulation), hydrolytic acidification, aerobic biological advanced treatment (chemical coagulation/strong oxidizer/sand filtration and the like), so that the problems of prolonged overall process flow, large chemical agent dosage, high cost and large chemical sludge yield are caused, and the problems of limited treatment capacity of biochemical sections (hydrolytic acidification and aerobic biochemical sections), increased toxic gas products of a hydrolytic acidification tank, large dead mud floating of an aerobic tank and the like are caused by the addition of the agents in water quality caused by the increase of salt content and the remarkable change of pH.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a biochemical combination method for treating PVA-containing printing and dyeing wastewater, which is more suitable for the water quality characteristics of the PVA-containing printing and dyeing wastewater and reduces secondary pollution from four aspects of shortening the whole treatment process flow, reducing the adding amount of chemical agents and improving the biochemical treatment capacity.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: a biochemical combination method for treating PVA-containing printing and dyeing wastewater comprises the following steps:
(1) Seed mud inoculation: respectively adding seed sludge into a submerged hydrolysis acidification biological filter reactor and a submerged aerobic biological filter reactor;
(2) Biological film hanging of submerged hydrolytic acidification biological filter reactor: pure nitrogen is introduced into the bottom of the submerged hydrolytic acidification biological filter reactor, and the reactor is continuously aerated and kept stand;
(3) Biological film hanging of submerged aerobic biological filter reactor: introducing air into the bottom of the submerged aerobic biofilter reactor, continuously ventilating and standing;
(4) Connection and start-up of the biofilter reactor: the water outlet of the submerged hydrolytic acidification biological filter reactor is connected with the water inlet of the submerged aerobic biological filter reactor through a pipeline; feeding the printing and dyeing wastewater A into a submerged hydrolysis acidification biological filter reactor, and maintaining the pH value range, the water temperature range and the hydraulic retention time range in a reaction system for culture; then the wastewater is sent into a submerged aerobic biofilter reactor through a pipeline, and the range of the dissolved oxygen content, the pH value range, the water temperature range and the hydraulic retention time range in the reaction system are maintained;
(5) The system stably operates: feeding the printing and dyeing wastewater B into a submerged hydrolysis acidification biological filter reactor, and maintaining the pH value range, the water temperature range and the hydraulic retention time range in a reaction system for culture; then the wastewater is sent into a submerged aerobic biological filter reactor through a pipeline, and the range of the dissolved oxygen content, the pH value range, the water temperature range and the hydraulic retention time range in the reaction system are kept until the biological treatment effect is stable.
The biochemical combination method for treating the PVA-containing printing and dyeing wastewater abandons a pretreatment (chemical coagulation) link, and shortens the treatment process flow of the PVA-containing printing and dyeing wastewater. Because the acid-base agent and the chemical coagulation agent are not added, the adding amount and cost of the chemical agent are obviously reduced, the salt content of water quality caused by artificial interference is reduced, and the improvement of the water quality can provide early guarantee for good biochemical treatment performance of a biochemical stage. And secondly, by adjusting a plurality of key parameters of a hydrolysis acidification reaction system, the alkaline printing and dyeing wastewater can be directly subjected to hydrolysis acidification biochemical treatment, so that the degradation capability of the biochemical section to COD, chromaticity and PVA in the printing and dyeing wastewater is effectively improved, the generation of toxic gas is reduced, and a decisive guarantee is provided for the stable biochemical performance of the subsequent aerobic biochemical section. In addition, by adjusting several key parameters of the hydrolysis acidification reaction system and improving the water quality of hydrolysis acidification effluent, the degradation capability of the biochemical section to COD, chromaticity and PVA in printing and dyeing wastewater is further improved, the death probability and the system breakdown probability of a large amount of aerobic sludge are reduced, and the dosage and the cost of the subsequent advanced treatment link are reduced.
As the preferred implementation mode of the biochemical combination method for treating PVA-containing printing and dyeing wastewater, the seed sludge in the step (1) is obtained by concentrating and precipitating secondary sedimentation tank activated sludge after air aeration; the pH value of the secondary sedimentation tank activated sludge is 6.8-7.6, the sludge concentration is 1800-2300mg/L, and the sedimentation time is 12h; the sludge concentration of the seed sludge is 22400-24400mg/L.
As a preferred embodiment of the biochemical combination method for treating PVA-containing printing and dyeing wastewater according to the present invention, the ratio of the inoculum size of the seed sludge in the step (1) to the effective volume of the reactor is the inoculum size of the seed sludge: effective volume of reactor = 1:2.5.
as a preferred implementation mode of the biochemical combination method for treating PVA-containing printing and dyeing wastewater, the nitrogen gas pressure in the step (3) is 0.22-0.25Mpa, and the continuous ventilation time is 36-48 h; standing for 2-3 h; the air pressure in the step (4) is controlled to be 0.023-0.03Mpa, the continuous ventilation time is 36-48h, and the standing time is 2-3 h.
According to the invention, pure nitrogen is continuously introduced into the bottom of the submerged hydrolysis acidification biological filter reactor for membrane hanging, when the sludge in the reactor is gradually attached to the surface of the combined filler and the color is changed from light brown to dark brown, the nitrogen is stopped from being introduced and the reactor is kept stand, the residual sludge is discharged from a sludge outlet at the bottom of the reactor, and membrane hanging is completed. The invention adopts the continuous air ventilation at the bottom of the submerged aerobic biofilter reactor to carry out film formation, when the sludge in the reactor is gradually adhered to the surface of the combined filler, the color of the sludge is kept to be light brown, after the sludge is aerated for a period of time, the air ventilation is stopped, the sludge is kept still, the residual sludge is discharged from a sludge discharge port at the bottom of the reactor, and the film formation is completed. The combined filler consists of a filler single sheet, a plastic sleeve and a central copper pipe wire, and has the structure that a plastic wafer is pressed and buckled into a double-ring large plastic ring, and polyester yarns are pressed on the ring of the ring, so that fiber bundles are uniformly distributed; the inner ring is snowflake-shaped plastic branches, so that films can be formed, bubbles can be effectively cut, and the transfer rate and the utilization rate of oxygen are improved, so that the water-gas biomembrane is fully exchanged, and characteristic pollutants in water are efficiently treated.
As a preferred embodiment of the biochemical combination method for treating PVA-containing printing and dyeing wastewater, the printing and dyeing wastewater A in the step (4) contains 4.4-6.5g/L glucose, 0.11-0.12g/L soluble starch and KH 2 PO 4 ·3H 2 O 0.02-0.03g/L，MgSO 4 0.02-0.03g/L，(NH 4 ) 2 CO 3 0.07-0.08g/L，MnSO 4 0.01-0.02g/L，Fe 2 (SO 4 ) 3 0.02-0.03g/L。
As the preferred implementation mode of the biochemical combination method for treating PVA-containing printing and dyeing wastewater, DO in the submerged hydrolysis acidification biological filter reactor in the step (4) is 0, the pH value is 5.6-8.0, the water temperature is 29.7-31.9 ℃, and the hydraulic retention time is 10-12 h; DO in the submerged aerobic biofilter reactor in the step (4) is 1.3-6.8mg/L, the pH value is 6.7-8.0, the water temperature is 29.0-31.4 ℃, and the hydraulic retention time is 10-12 h.
As a preferred embodiment of the biochemical combination method for treating PVA-containing printing and dyeing wastewater according to the present invention, the printing and dyeing wastewater B of step (5) contains the following components in concentration: glucose 4.4-6.5g/L, soluble starch 0.11-0.12g/L, KH 2 PO 4 ·3H 2 O 0.02-0.03g/L，MgSO 4 0.02-0.03g/L，(NH 4 ) 2 CO 3 0.07-0.08g/L，MnSO 4 0.01-0.02g/L，Fe 2 (SO 4 ) 3 0.02-0.03g/L PVA 0.1-0.2g/L and reactive black dye 0.05g/L.
As the preferred implementation mode of the biochemical combination method for treating PVA-containing printing and dyeing wastewater, DO in the submerged hydrolysis acidification biological filter reactor in the step (5) is 0, the pH value is 6.1-7.2, the water temperature is 29.0-31.8 ℃, and the hydraulic retention time is 10-12 h; DO in the submerged aerobic biofilter reactor in the step (5) is 2.0-6.8mg/L, the pH value is 5.8-7.7, the water temperature is 28.2-31.8 ℃, and the hydraulic retention time is 10-12 h.
As a preferred embodiment of the biochemical combination method for treating PVA-containing printing and dyeing wastewater according to the present invention, the biological treatment effect in the step (5) is stabilized as follows: when the inflow water is the printing and dyeing wastewater A, the COD removal rate is 80.5-95.5%, the average removal rate is 90.5%, the ammonia nitrogen removal rate is increased from 0% to 100.0%, and the average removal rate is 75.8%; when the inflow water is the printing and dyeing wastewater B, the COD removal rate is 88.9-100.0%, the average removal rate is 95.4%, the ammonia nitrogen removal rate is increased from 37.5% to 100.0%, the average removal rate is 89.4%, the dye removal rate is 35.5-98.9%, the average removal rate is 89.5%, the PVA removal rate is 52.5-78.8%, and the average removal rate is 69.6%.
The invention also provides application of the biochemical combination method for treating the PVA-containing printing and dyeing wastewater in treating the PVA-containing printing and dyeing wastewater.
The invention has the beneficial effects that: the invention provides a biochemical combination method for treating PVA-containing printing and dyeing wastewater, which (1) abandons a pretreatment (chemical coagulation) link, shortens the treatment process flow of PVA-containing printing and dyeing wastewater, can directly carry out biochemical treatment on alkaline water quality, reduces the increase of water salt content caused by dosing (increases the difficulty of biochemical treatment and the difficulty and the technical cost of reclaimed water recycling), does not generate chemical sludge, and effectively prevents secondary pollution; (2) The COD removal rate in the hydrolysis acidification biochemical stage is within the range of 34.2-100.0%, the average removal rate is 71.7%, the secondary pollution gas is reduced, and the treatment pressure of the aerobic biochemical stage is effectively slowed down; (3) The COD removal rate of the invention in the aerobic biochemical section is 56.9.0-100.0%, the average removal rate is 82.2%, and the phenomena of aerobic sludge death and system breakdown are not easy to occur; (4) The invention saves the civil cost, the cost of various dosing tanks and the pipeline laying cost in the pretreatment dosing and the dosing agent dosing links, effectively reduces the secondary pollution gas of the hydrolysis acidification tank, does not need to install a gas collecting and treating device, slows down the corrosion phenomenon of pipe fittings such as pipelines, and saves the maintenance cost.
Drawings
FIG. 1 is a process flow diagram of a biochemical combination method for treating PVA-containing printing and dyeing wastewater according to the present invention.
FIG. 2 is a diagram showing COD removal of dyeing wastewater in the biochemical combination method for treating PVA-containing dyeing wastewater in example 1.
FIG. 3 is a schematic diagram showing the NH of dyeing wastewater obtained by the biochemical combination method for treating PVA-containing dyeing wastewater in example 1 4 + -N removal case graph.
FIG. 4 is a graph showing dye removal of dyeing wastewater by the biochemical combination method for treating PVA-containing dyeing wastewater of example 1.
FIG. 5 is a diagram showing PVA removal from the printing and dyeing wastewater by the biochemical combination method for treating PVA-containing printing and dyeing wastewater according to example 1.
Detailed Description
The above-described aspects of the present invention will be described in further detail below with reference to specific embodiments in the form of examples. It should not be understood that the scope of the above subject matter of the present invention is limited to the following examples only. All techniques implemented based on the above description of the invention are within the scope of the invention.
Example 1
The artificial ammonia nitrogen water distribution quality of this embodiment has the following parameters: pH 7.40-9.30, COD cr 400.0-1025.0mg/L，NH 4 + 6.0-33.0mg/L of N, 31.0-139.0mg/L of reactive black dye and 100.0-200.0mg/L of PVA.
The process flow of the biochemical combination method for treating PVA-containing printing and dyeing wastewater of the embodiment is shown in fig. 1.
The biochemical combination method for treating PVA-containing printing and dyeing wastewater in the embodiment comprises the following steps:
(1) Preparing seed mud: taking secondary sedimentation tank activated sludge of town sewage plants as seed sludge, wherein the pH value is within the range of 6.8-7.6, the sludge concentration (MLSS) is within the range of 1800-2300mg/L, aerating and concentrating by air, at the moment, the sludge MLSS is within the range of 11000-14000mg/L, and the volatile sludge concentration MLVSS is within the range of 3200-3600 mg/L. After precipitation for 12 hours, the adjusted sludge concentration is in the range of 22400-24400 mg/L;
(2) Seed mud inoculation: 3L of the seed sludge subjected to precipitation concentration adjustment in the step (1) is poured into a submerged anaerobic biological filter reactor with the total volume of 3.2L, and then 3L of the sludge is poured into a submerged aerobic biological filter reactor with the total volume of 3.2L; the final actual sludge usage to effective volume ratio of the two reactors is 1:2.5;
(3) Biological film formation of submerged hydrolytic acidification biological filter reactor (H reactor): and (3) introducing pure nitrogen into the bottom of the H reactor in the step (2), controlling the air pressure within the range of 0.22-0.25Mpa, and continuously introducing the air for 36-48H. When the sludge in the reactor is gradually attached to the surface of the combined filler and the color of the sludge is changed from light brown to dark brown, stopping introducing nitrogen at the moment, standing for 2-3 hours, and discharging the residual sludge from a sludge discharge port at the bottom of the reactor;
(4) Biofilm formation of submerged aerobic biofilter reactor (O reactor): introducing air into the bottom of the O reactor in the step (2), controlling the air pressure within the range of 0.023-0.03Mpa, and continuously introducing air for 36-48h. When the sludge in the reactor is gradually attached to the surface of the combined filler, keeping the color of the sludge unchanged in light brown, stopping introducing air after 36-48 hours, standing for 2-3 hours, and discharging the residual sludge from a sludge discharge port at the bottom of the reactor;
the combined filler in the steps (3) and (4) consists of a filler single sheet, a plastic sleeve and a central copper pipe wire, and has the structure that a plastic wafer is pressed and buckled into a double-ring large plastic ring, and polyester yarns are pressed on the ring of the ring, so that fiber bundles are uniformly distributed; the inner ring is snowflake-shaped plastic branches, so that films can be formed, bubbles can be effectively cut, and the transfer rate and the utilization rate of oxygen are improved, so that the water-gas biomembrane is fully exchanged, and characteristic pollutants in water are efficiently treated.
(5) Preparing printing and dyeing wastewater A: the printing and dyeing wastewater A is artificial water distribution prepared by adding chemical analysis pure medicaments into tap water, and the components and the concentrations of the water are as follows: glucose 4.4g/L, soluble starch 0.11-0.12g/L, KH 2 PO 4 ·3H 2 O 0.02-0.03g/L，MgSO 4 0.02-0.03g/L，(NH 4 ) 2 CO 3 0.07-0.08g/L，MnSO 4 0.01-0.02g/L，Fe 2 (SO 4 ) 3 0.02-0.03g/L. The water quality of the inlet water and the starting of the reaction systemThe parameters of 1 to 37 days are shown in Table 1.
TABLE 1
(6) Starting a submerged hydrolysis acidification biological filter reactor (H reactor): feeding the printing and dyeing wastewater A prepared in the step (5) into an H reactor which is successfully coated in the step (3), wherein the reactor is not aerated, DO in a reaction system is 0, the pH value is controlled within the range of 5.6-8.0, the water temperature is controlled within the range of 29.7-31.9 ℃, and the hydraulic retention time is controlled within the range of 10-12H;
(7) Starting a submerged aerobic biofilter reactor (O reactor): delivering the effluent of the H reactor in the step (6) into an O reactor which is successfully coated in the step (4) through a pipeline, wherein DO in a reaction system is 1.3-6.8mg/L, the pH value is controlled within the range of 6.7-8.0, the water temperature is controlled within the range of 29.0-31.4 ℃, and the hydraulic retention time is controlled within the range of 10-12H;
(8) Preparing printing and dyeing wastewater B: the printing and dyeing wastewater B is artificial water distribution prepared by adding chemical analysis pure medicaments into tap water, and the components and the concentrations of the water are as follows: glucose 4.4-6.5g/L, soluble starch 0.11-0.12g/L, KH 2 PO 4 ·3H 2 O 0.02-0.03g/L，MgSO 4 0.02-0.03g/L，(NH 4 ) 2 CO 3 0.07-0.08g/L，MnSO 4 0.01-0.02g/L，Fe 2 (SO 4 ) 3 0.02-0.03g/L PVA 0.1-0.2g/L and reactive black dye 0.05g/L. The quality of the incoming water and the parameters of the reaction system for 38 to 90 days are shown in Table 2.
TABLE 2
(9) Stable operation: and (3) feeding the printing and dyeing wastewater B into the H reactor in the step (6), and feeding the effluent of the H reactor in the step (6) into the O reactor in the step (7) through a pipeline. Wherein DO in the H reactor is 0, the pH value is controlled within the range of 6.1-7.2, the water temperature is controlled within the range of 29.0-31.8 ℃, and the hydraulic retention time is controlled within the range of 10-12H; DO in the O reactor is 2.0-6.8mg/L, pH value is controlled within 5.8-7.7, water temperature is controlled within 28.2-31.8 ℃, and hydraulic retention time is controlled within 10-12 h;
(10) The system was started and run for 90 days without discharging mud.
2-5, when the inflow water is printing and dyeing wastewater A in the starting stage, the COD removal rate is in the range of 80.5-95.5%, and the average removal rate is 90.5%; the ammonia nitrogen removal rate is increased from 0% to 100.0%, and the average removal rate is 75.8%; in the operation stage of the system, when the water inflow quality is the printing and dyeing wastewater B, the COD removal rate is 88.9-100.0%, and the average removal rate is 95.4%; the ammonia nitrogen removal rate is increased from 37.5% to 100.0%, and the average removal rate is 89.4%; the dye removal rate is from 35.5 to 98.9 percent, and the average removal rate is 89.5 percent; the PVA removal rate is 52.5-78.8%, and the average removal rate is 69.6%.
Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention.
Claims (5)
1. A biochemical combination method for treating PVA-containing printing and dyeing wastewater is characterized by comprising the following steps:
(1) Seed mud inoculation: respectively adding seed sludge into a submerged hydrolysis acidification biological filter reactor and a submerged aerobic biological filter reactor;
(2) Biological film hanging of submerged hydrolytic acidification biological filter reactor: pure nitrogen is introduced into the bottom of the submerged hydrolytic acidification biological filter reactor, and the reactor is continuously aerated and kept stand;
(3) Biological film hanging of submerged aerobic biological filter reactor: introducing air into the bottom of the submerged aerobic biofilter reactor, continuously ventilating and standing;
(4) Connection and start-up of the biofilter reactor: the water outlet of the submerged hydrolytic acidification biological filter reactor is connected with the water inlet of the submerged aerobic biological filter reactor through a pipeline; feeding the printing and dyeing wastewater A into a submerged hydrolysis acidification biological filter reactor, and maintaining the pH value range, the water temperature range and the hydraulic retention time range in a reaction system for culture; then the wastewater is sent into a submerged aerobic biofilter reactor through a pipeline, and the range of the dissolved oxygen content, the pH value range, the water temperature range and the hydraulic retention time range in the reaction system are maintained; the system is operated until the biological treatment effect is stable;
(5) The system stably operates: feeding the printing and dyeing wastewater B into a submerged hydrolysis acidification biological filter reactor, and maintaining the pH value range, the water temperature range and the hydraulic retention time range in a reaction system for culture; then the wastewater is sent into a submerged aerobic biological filter reactor through a pipeline, and the range of the dissolved oxygen content, the pH value range, the water temperature range and the hydraulic retention time range in the reaction system are kept until the biological treatment effect is stable;
the nitrogen pressure in the step (2) is 0.22-0.25Mpa, and the continuous ventilation time is 36-48 h; standing for 2-3 hours; the air pressure in the step (3) is controlled to be 0.023-0.03Mpa, the continuous ventilation time is 36-48h, and the standing time is 2-3 h;
in the step (4), DO in a submerged hydrolysis acidification biological filter reactor is 0, the pH value is 5.6-8.0, the water temperature is 29.7-31.9 ℃, and the hydraulic retention time is 10-12 h; in the step (4), DO in the submerged aerobic biofilter reactor is 1.3-6.8mg/L, the pH value is 6.7-8.0, the water temperature is 29.0-31.4 ℃, and the hydraulic retention time is 10-12 h;
the seed sludge in the step (1) is obtained by concentrating and precipitating secondary sedimentation tank activated sludge after air aeration; the pH value of the secondary sedimentation tank activated sludge is 6.8-7.6, the sludge concentration is 1800-2300mg/L, and the sedimentation time is 12h; the sludge concentration of the seed sludge is 22400-24400 mg/L;
the ratio of the inoculation amount of the seed sludge in the step (1) to the effective volume of the reactor is: effective volume of reactor = 1:2.5;
in the step (5), DO in a submerged hydrolysis acidification biological filter reactor is 0, the pH value is 6.1-7.2, the water temperature is 29.0-31.8 ℃, and the hydraulic retention time is 10-12 h; in the step (5), DO in the submerged aerobic biofilter reactor is 2.0-6.8mg/L, pH value is 5.8-7.7, water temperature is 28.2-31.8 ℃, and hydraulic retention time is 10-12 h.
2. The biochemical combination method for treating PVA-containing printing and dyeing wastewater according to claim 1, wherein the printing and dyeing wastewater a of step (4) contains the following concentration components: glucose 4.4-6.5g/L, soluble starch 0.11-0.12g/L, KH2PO4 & 3H2O 0.02-0.03g/L, mgSO4 0.02-0.03g/L, (NH 4) 2CO3 0.07-0.08 g/L, mnSO4 0.01-0.02 g/L, fe2 (SO 4) 3.02-0.03 g/L.
3. The biochemical combination method for treating PVA-containing printing and dyeing wastewater according to claim 1, wherein the printing and dyeing wastewater B of step (5) contains the following concentration components: glucose 4.4-6.5g/L, soluble starch 0.11-0.12g/L, KH2PO4 & 3H2O 0.02-0.03g/L, mgSO4 0.02-0.03g/L, (NH 4) 2CO3 0.07-0.08 g/L, mnSO4 0.01-0.02 g/L, fe2 (SO 4) 3.02-0.03 g/L, PVA 0.1-0.2g/L, and reactive black dye 0.05g/L.
4. The biochemical combination method for treating PVA-containing printing and dyeing wastewater according to claim 1, wherein the biological treatment effect in the step (4) is stabilized as follows: COD removal rate is 80.5-95.5%, average removal rate is 90.5%, ammonia nitrogen removal rate is increased from 0% to 100.0%, and average removal rate is 75.8%; the biological treatment effect in the step (5) is stabilized as follows: the COD removal rate is 88.9-100.0%, the average removal rate is 95.4%, the ammonia nitrogen removal rate is increased from 37.5% to 100.0%, the average removal rate is 89.4%, the dye removal rate is 35.5-98.9%, the average removal rate is 89.5%, the PVA removal rate is 52.5-78.8%, and the average removal rate is 69.6%.
5. The use of the biochemical combination method for treating PVA-containing printing and dyeing wastewater according to any one of claims 1 to 4 in the treatment of PVA-containing printing and dyeing wastewater.
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