CN105692967B - A kind of processing method of PVA process units waste water - Google Patents
A kind of processing method of PVA process units waste water Download PDFInfo
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Abstract
The present invention relates to a kind of processing method of PVA process units waste water, step is：Step 1, process units wastewater pH is adjusted to 2~4；Step 2, process units waste water enters iron-carbon micro-electrolysis reaction tank and is reacted；Step 3, process units waste water enters Fenton oxidation reaction tank and is reacted；Step 4, alkali, the iron ion in the flocculating setting water outlet are added into the water outlet of Fenton oxidation reaction tank；Step 5, the water outlet of Fenton oxidation reaction tank enters level-one aerobic reaction tank and is reacted；Step 6, the water outlet of level-one aerobic reaction tank enters two level aerobic reaction tank and is reacted, water outlet qualified discharge after secondary settling tank settles.Processing method of the present invention makes up single technique using group technology and removes halfway defect, advanced treating PVA process units waste water to PVA process units waste water CODs, the final qualified discharge for realizing PVA process units waste water, obvious processing effect are safeguarded simple, small investment, it is at low cost.
Description
Technical field
The present invention relates to industrial installation technical field of waste water processing, specifically a kind of PVA process units waste water
Processing method.Espespecially utilize " iron-carbon micro-electrolysis+Fenton oxidation+two level is aerobic " technique advanced treating PVA process units waste water
Method.
Background technology
Industrial wastewater is the important sources of water pollution, accounts for four or five ten or so the percent of the total quantity of wastewater effluent in China, industry
Due to the Recalcitrant chemicals containing high concentration in waste water, cause its biodegradability poor, salinity is big, it is difficult to pass through conventional treatment
Method realizes qualified discharge, exerts heavy pressures on to enterprise itself and surrounding enviroment.
PVA (polyvinyl alcohol) is a kind of widely used high molecular weight water soluble polymer, is divided into fiber and non-fiber two is big
There is unique bonding, oil resistant and gas characteristics, the application range such as to block and be related to weaving, food, medicine, papermaking, print for purposes
The industries such as brush.A large amount of PVA process units waste water is supervened in PVA production processes, which has organic concentration height, water
The variation of matter water belongs to intractable industrial wastewater greatly and the features such as difficult for biological degradation, using conventional biological method processing hardly possible
To realize qualified discharge.
By taking PVA process units waste water caused by the process units in Sichuan chemical plant as an example, the pH of the waste water is 7 left
The right side, a concentration of 1000~1600mg/L of COD, the major pollutants contained in waste water are acetate and PVA, and wherein PVA belongs to difficult raw
Object degradation of organic substances, content are 400~500mg/L, it is difficult to realize qualified discharge by common biochemical process.
Iron-carbon micro-electrolysis is also known as internal electrolysis, is to carry out pretreated skill to waste water using the cell reaction of Fe/C primary batteries
Art generates Fe during the cell reaction of Fe/C primary batteries2+Ion and H free radicals pass through redox, flocculation adsorption, catalysis oxygen
Change and industrial wastewater is handled the effects that deposition is complexed, useless water part organic matter can not only be removed, while can also drop
Low wastewater toxicity improves the biodegradability of waste water.Iron-carbon micro-electrolysis has applied widely, high treating effect and of low cost
The advantages that, and using waste iron filing as raw material, the meaning recycled with waste resource.
Fenton reactions are a kind of high-level oxidation technologies, refer to H2O2In Fe2+Catalysis under some row chain reaction, lifes occur
At the process of the hydroxyl radical free radical of high activity, hydroxyl radical free radical have very strong oxidability, by electronics transfer, it is electrophilic plus
At the majority of organic pollutants in Decomposition Wastewater the effects that, dehydrogenation reaction, be commonly used for paper waste, oily waste water, pesticide,
The pretreatment of the used water difficult to degradate such as preservative and landfill leachate.Fenton reactions are with easy to operate, oxidability is strong, place
Manage it is efficient, do not generate the advantages such as secondary pollution, cause attention both domestic and external, become the research hotspot of water process.
Aerobic is most common biological treatment, which is acted on by the absorption degradation of microorganism, will be in waste water
Organic matter is converted into H2O and CO2Equal harmless products, to realize the qualified discharge of waste water, with wastewater discharge increase and environmental protection
Standard it is more stringent, processing carried out to waste water seem particularly necessary using two level is aerobic, two level is aerobic, and to not only reduce COD negative
Impact of the lotus to sludge system, while the organic matter in further removal waste water, deep purification of wastewater realize the up to standard of waste water
Discharge.
Patent " method of iron-carbon micro-electrolysis pretreatment waste water containing hydrazine and its derivative " (application number 201310672391)
The method for describing a kind of iron-carbon micro-electrolysis pretreatment waste water containing hydrazine and its derivative will contain hydrazine and its derivative waste water with dilute
Sulphur acid for adjusting pH is 2~4, then will contain hydrazine and its derivative waste water by light electrolysis column, while the air-blowing into light electrolysis column, and contain
Mean residence time of the hydrazine and its derivative waste water in light electrolysis column is 2~24 hours.The light electrolysis column is the micro- electricity of Fe-C
Xie Zhu uses iron and charcoal for filler, and iron, charcoal weight ratio are 6:1~30:1, the filler iron in light electrolysis column is graininess or clast
The sponge iron of shape, iron plane flower or waste iron filing ironwork, the stuffing by carbon in light electrolysis column is column, graininess or clastic activity
The grain size of charcoal, filler iron and charcoal is 1~50mm.Invention simple possible, the relative inexpensiveness, COD removal rate energy in waste water
Reach 70%~80%.
" reverse osmosis-light electrolysis integrated technology handles dyeing waste water " (Duan Xiaodi, Ma Ning, Inner Mongol University of Technology's journal,
2008,27(3):178-181) describe a kind of technology handling dyeing waste water using reverse osmosis-light electrolysis integrated technology.Printing and dyeing
Waste water is first through reverse osmosis membrane processing, and the permeate of reverse osmosis membrane has reached the water quality of recycled water, and concentrate recycles the micro- electricity of iron carbon
Solution processing, qualified discharge after processing.The experimental results showed that at optimum conditions, Fe-C Micro Electrolysis Method is to dyeing waste water concentrate
Handle largely effective, COD, turbidity, chroma removal rate respectively reach 75%, 99%, 100%.
Iron-carbon micro-electrolysis, which handles industrial wastewater, has simple for process, advantage with obvious effects, but drop difficult for some, difficult
The industrial wastewater of solution, the processing of single iron-carbon micro-electrolysis can not achieve the effect that discharge standard or reach satisfied, therefore, need
Advanced treating is further carried out in conjunction with other techniques.
Invention content
In view of the deficiencies in the prior art, the purpose of the present invention is to provide a kind of places of PVA process units waste water
Reason method can effectively remove the pollutant in PVA process units waste water, realize the qualified discharge of PVA process units waste water.
To achieve the above objectives, the technical solution adopted by the present invention is that：
A kind of processing method of PVA process units waste water, which is characterized in that include the following steps：
Step 1, it pre-processes：Acid is added into PVA process units waste water, its pH is adjusted to 2~4；
Step 2, iron-carbon micro-electrolysis：Pretreated PVA process units waste water, into iron-carbon micro-electrolysis reaction tank, aeration
Reaction, gas-water ratio 6:1~10:1,0.5~4h is stopped, PVA process units waste water is handled, PVA productions dress after processing
Set Fe in waste water2+A concentration of 100~300mg/L；
Step 3, Fenton oxidation：It is anti-into Fenton oxidation through iron-carbon micro-electrolysis treated PVA process units waste water
H is added in Ying Chi2O2, a concentration of 500~1500mg/L is sufficiently stirred and reacted, and stops 1~6h；
Step 4, flocculating setting：Alkali is added into the water outlet of Fenton oxidation reaction tank, adjusts the pH to 7~8 of the water outlet
Between, it is sufficiently stirred, the iron ion in the flocculating setting water outlet；
Step 5, level-one is aerobic：After flocculating setting, the water outlet of Fenton oxidation reaction tank enters level-one aerobic reaction tank, dirty
A concentration of 1.5~2.5g/L of mud is aerated using micro-pore aeration method, is maintained oxygen content in 2~4mg/L, is stopped 8~22h；
Step 6, two level is aerobic：The water outlet of level-one aerobic reaction tank enters two level aerobic reaction tank, and sludge concentration is 2~
3g/L is aerated using micro-pore aeration method, maintains oxygen content in 2~4mg/L, and the residence time is 3~17h, two level aerobic reaction tank
Water outlet after secondary settling tank settles, the standard water discharge of secondary settling tank is discharged.
Based on the above technical solution, in step 1, the water quality of the PVA process units waste water is：COD is a concentration of
1000~1600mg/L, pH are that 6.5~7.5, PVA contents are 300~400mg/L, and major pollutants are PVA and acetate.
Based on the above technical solution, in step 1, the acid of addition is sulfuric acid.
Based on the above technical solution, in step 2, the residence time is 1~2h.
Based on the above technical solution, in step 3, the residence time is 2~4h.
Based on the above technical solution, in step 4, the alkali of addition is sodium hydroxide or potassium hydroxide.
Based on the above technical solution, in step 5, the residence time is 10~20h.
Based on the above technical solution, in step 6, the residence time is 5~15h.
Based on the above technical solution, in step 6, the water outlet of the secondary settling tank, COD is less than 60mg/L, meets
《Integrated wastewater discharge standard (GB8978-1996)》The requirement of two pollutant first discharge standards.
The processing method of PVA process units waste water of the present invention, using " iron-carbon micro-electrolysis+Fenton oxidation+two
Grade is aerobic " group technology, it is halfway to the removal of PVA process units waste water CODs scarce which can make up single technique
It falls into, advanced treating PVA process units waste water, the final qualified discharge for realizing PVA process units waste water, the group technology has place
Significant effect is managed, safeguards simple, small investment, the advantages such as at low cost.
The processing method of PVA process units waste water of the present invention, innovative point be using iron-carbon micro-electrolysis and
Fenton oxidation reaction reduces the COD of PVA process units waste water, improves the biodegradability of PVA process units waste water, passes through two
The aerobic advanced treating of grade realizes PVA process units discharged wastewater met the national standard, solves the discharge and improvement of wastewater from chemical industry difficult to degrade
Problem realizes the qualified discharge of PVA process units waste water, has significant economic and social benefit.
Description of the drawings
The present invention has following attached drawing：
The process flow diagram of Fig. 1 present invention.
Specific implementation mode
Below in conjunction with attached drawing, invention is further described in detail.
As shown in Figure 1, the processing method of PVA process units waste water of the present invention, includes the following steps：
Step 1, it pre-processes：Acid is added into PVA process units waste water, its pH is adjusted to 2~4；
Step 2, iron-carbon micro-electrolysis：Pretreated PVA process units waste water, into iron-carbon micro-electrolysis reaction tank, aeration
Reaction, gas-water ratio 6:1~10:1,0.5~4h is stopped, PVA process units waste water is handled, PVA productions dress after processing
Set Fe in waste water2+A concentration of 100~300mg/L；
Step 3, Fenton oxidation：It is anti-into Fenton oxidation through iron-carbon micro-electrolysis treated PVA process units waste water
H is added in Ying Chi2O2, a concentration of 500~1500mg/L is sufficiently stirred and reacted, and stops 1~6h；
Step 4, flocculating setting：Alkali is added into the water outlet of Fenton oxidation reaction tank, adjusts the pH to 7~8 of the water outlet
Between, it is sufficiently stirred, the iron ion in the flocculating setting water outlet；
Step 5, level-one is aerobic：After flocculating setting, the water outlet of Fenton oxidation reaction tank enters level-one aerobic reaction tank, dirty
A concentration of 1.5~2.5g/L of mud is aerated using micro-pore aeration method, is maintained oxygen content in 2~4mg/L, is stopped 8~22h；
Step 6, two level is aerobic：The water outlet of level-one aerobic reaction tank enters two level aerobic reaction tank, and sludge concentration is 2~
3g/L is aerated using micro-pore aeration method, maintains oxygen content in 2~4mg/L, and the residence time is 3~17h, two level aerobic reaction tank
Water outlet after secondary settling tank settles, the standard water discharge of secondary settling tank is discharged.
Based on the above technical solution, in step 1, the water quality of the PVA process units waste water is：COD is a concentration of
1000~1600mg/L, pH are that 6.5~7.5, PVA contents are 300~400mg/L, and major pollutants are PVA and acetate.
Based on the above technical solution, in step 1, the acid of addition is sulfuric acid.
Based on the above technical solution, in step 2, the preferably residence time is 1~2h.
Based on the above technical solution, in step 3, the preferably residence time is 2~4h.
Based on the above technical solution, in step 4, the alkali of addition is sodium hydroxide or potassium hydroxide.
Based on the above technical solution, in step 5, the preferably residence time is 10~20h.
Based on the above technical solution, in step 6, the preferably residence time is 5~15h.
Based on the above technical solution, in step 6, the water outlet of the secondary settling tank, COD is less than 60mg/L, meets
《Integrated wastewater discharge standard (GB8978-1996)》The requirement of two pollutant first discharge standards.
The present invention has following substantive distinguishing features outstanding and progress：
1) PVA process units waste water is handled using iron-carbon micro-electrolysis, can not only removes a part of organic matter, dropped
Impact of the low COD loads to subsequent technique, when avoiding routine biochemistry process PVA process units waste water, PVA is precipitated, dirty
Mud adhesion, the problem of making Mud up-floating lump, and will produce a large amount of ferrous ion in iron-carbon micro-electrolysis processing procedure, this
The catalyst that a little ferrous ions can be reacted directly as follow-up Fenton, to save the cost of Fenton reactions；
2) Fenton oxidation can further remove the organic matter in PVA process units waste water, and can aoxidize PVA lifes
The COD in device waste water is produced, biodegradability is improved, reduces the impact to subsequent biochemical processing system；
3) level-one is aerobic mainly passes through most of organic matter in the effect removal PVA process units waste water of microorganism；
4) two level it is aerobic can further remaining COD in degrading waste water, depth is carried out to PVA process units waste water
Reason realizes the qualified discharge of PVA process units waste water.
The present invention and patent " method of iron-carbon micro-electrolysis pretreatment waste water containing hydrazine and its derivative " (application number
201310672391) it compares, the pH of this process adjustments PVA process units waste water is reduced using the processing of iron-carbon micro-electrolysis
COD in PVA process units waste water, subsequent Fenton reaction make full use of the ferrous ion that iron-carbon micro-electrolysis generates, and save
Cost, further aoxidizes PVA process units waste water, the biodegradability of PVA process units waste water is improved, finally by two
The aerobic advanced treating of grade realizes PVA process units discharged wastewater met the national standard.
Embodiment is as follows：
Embodiment 1：The PVA process units waste water of certain enterprise, COD 1600mg/L, pH 7.5, major pollutants are
PVA and acetate, processing step are as follows：
Step 1：Pretreatment, sulfuric acid is added into PVA process units waste water, its pH is adjusted to 2；
Step 2：Iron-carbon micro-electrolysis, above-mentioned pretreated PVA process units waste water enter iron-carbon micro-electrolysis reaction tank, expose
Solid/liquid/gas reactions, gas-water ratio 6:1, stop 1h, Fe in PVA process units waste water after processing2+A concentration of 100mg/L；
Step 3：Fenton oxidation, the PVA process units waste water handled through iron-carbon micro-electrolysis enter Fenton oxidation reaction
H is added in pond2O2, a concentration of 1500mg/L, stirring reacted, stop 4h；
Step 4：Sodium hydroxide is added in flocculating setting in being discharged after Fenton oxidation, adjust pH to 8, be sufficiently stirred, and wads a quilt with cotton
Iron ion in PVA process units waste water drops in retrogradation；
Step 5：Level-one is aerobic, enters level-one aerobic reaction tank after the sedimentation of PVA process units waste water flocculatings, is exposed using micropore
Gas method is aerated, and is maintained oxygen content in 4mg/L, sludge concentration 1.5g/L, is fully aerated, stops 20h；
Step 6：Two level is aerobic, and PVA process units waste water is after the processing of level-one aerobic reaction tank, into two level aerobic reaction
Pond is aerated using micro-pore aeration method, is maintained oxygen content in 2mg/L, sludge concentration 3g/L, residence time 5h, is sunk by two
It is discharged after the sedimentation of pond.Detection water outlet COD is 55mg/L, reaches discharge standard requirement.
Embodiment 2：The PVA process units waste water of certain enterprise, COD 1000mg/L, pH 6.5, major pollutants are
PVA and acetate, processing step are as follows：
Step 1：Pretreatment, sulfuric acid is added into PVA process units waste water, its pH is adjusted to 4；
Step 2：Iron-carbon micro-electrolysis, above-mentioned pretreated PVA process units waste water enter iron-carbon micro-electrolysis reaction tank, expose
Solid/liquid/gas reactions, gas-water ratio 10:1, stop 2h, Fe in PVA process units waste water after processing2+A concentration of 300mg/L；
Step 3：Fenton oxidation, the PVA process units waste water handled through iron-carbon micro-electrolysis enter Fenton oxidation reaction
H is added in pond2O2, a concentration of 500mg/L, stirring reacted, stop 2h；
Step 4：Potassium hydroxide is added in flocculating setting in being discharged after Fenton oxidation, adjust pH to 7, be sufficiently stirred, and wads a quilt with cotton
Iron ion in PVA process units waste water drops in retrogradation；
Step 5：Level-one is aerobic, and level-one aerobic reaction tank is entered after the sedimentation of PVA process units waste water flocculatings, quick-fried using micropore
Gas method is aerated, and is maintained oxygen content in 2mg/L, sludge concentration 2.5g/L, is fully aerated, stops 10h；
Step 6：Two level is aerobic, and PVA process units waste water is after the processing of level-one aerobic reaction tank, into two level aerobic reaction
Pond is aerated using micropore gas explosion method, is maintained oxygen content in 4mg/L, sludge concentration 2g/L, residence time 15h, is sunk by two
It is discharged after the sedimentation of pond.Detection water outlet COD is 40mg/L, reaches discharge standard requirement.
Embodiment 3：The PVA process units waste water of certain enterprise, COD 1300mg/L, pH 7, major pollutants PVA
And acetate, processing step are as follows：
Step 1：Pretreatment, sulfuric acid is added into PVA process units waste water, its pH is adjusted to 3；
Step 2：Iron-carbon micro-electrolysis, above-mentioned pretreated PVA process units waste water enter iron-carbon micro-electrolysis reaction tank, expose
Solid/liquid/gas reactions, gas-water ratio 8:1, stop 1.5h, Fe in PVA process units waste water after processing2+A concentration of 200mg/L；
Step 3：Fenton oxidation, the PVA process units waste water handled through iron-carbon micro-electrolysis enter Fenton oxidation reaction
H is added in pond2O2, a concentration of 1000mg/L, stirring reacted, stop 3h；
Step 4：Sodium hydroxide is added in flocculating setting in being discharged after Fenton oxidation, adjust pH to 7.5, be sufficiently stirred,
Iron ion in flocculating setting PVA process units waste water；
Step 5：Level-one is aerobic, enters level-one aerobic reaction tank after the sedimentation of PVA process units waste water flocculatings, is exposed using micropore
Gas method is aerated, and is maintained oxygen content in 3mg/L, sludge concentration 2g/L, is fully aerated, stops 15h；
Step 6：Two level is aerobic, and PVA process units waste water is after the processing of level-one aerobic reaction tank, into two level aerobic reaction
Pond is aerated using micro-pore aeration method, is maintained oxygen content in 3mg/L, sludge concentration 2.5g/L, residence time 10h, is passed through
It is discharged after secondary settling tank sedimentation.Detection water outlet COD is 50mg/L, reaches discharge standard requirement.
Embodiment 4：The PVA process units waste water of certain enterprise, COD 1300mg/L, pH 6.7, major pollutants are
PVA and acetate, processing step are as follows：
Step 1 pre-processes, and sulfuric acid is added into PVA process units waste water, its pH is adjusted to 2.5；
Step 2：Iron-carbon micro-electrolysis, above-mentioned pretreated PVA process units waste water enter iron-carbon micro-electrolysis reaction tank, expose
Solid/liquid/gas reactions, gas-water ratio 7:1, stop 1.3h, Fe in PVA process units waste water after processing2+A concentration of 160mg/L；
Step 3：Fenton oxidation, the PVA process units waste water handled through iron-carbon micro-electrolysis enter Fenton oxidation reaction
H is added in pond2O2, a concentration of 700mg/L, stirring reacted, stop 2.5h；
Step 4：Potassium hydroxide is added in flocculating setting in being discharged after Fenton oxidation, adjust pH to 7.7, be sufficiently stirred,
Iron ion in flocculating setting PVA process units waste water；
Step 5：Level-one is aerobic, enters level-one aerobic reaction tank after the sedimentation of PVA process units waste water flocculatings, is exposed using micropore
Gas method is aerated, and is maintained oxygen content in 2.5mg/L, sludge concentration 1.8g/L, is fully aerated, stops 13h；
Step 6：Two level is aerobic, and PVA process units waste water is after the processing of level-one aerobic reaction tank, into two level aerobic reaction
Pond is aerated using micro-pore aeration method, is maintained oxygen content in 3.5mg/L, sludge concentration 2.3g/L, residence time 7h, is passed through
It is discharged after secondary settling tank sedimentation.Detection water outlet COD is 53mg/L, reaches discharge standard requirement.
Embodiment 5：The PVA process units waste water of certain enterprise, COD 1400mg/L, pH 7.3, major pollutants are
PVA and acetate, processing step are as follows：
Step 1：Pretreatment, sulfuric acid is added into PVA process units waste water, its pH is adjusted to 3.5；
Step 2：Iron-carbon micro-electrolysis, above-mentioned pretreated PVA process units waste water enter iron-carbon micro-electrolysis reaction tank, expose
Solid/liquid/gas reactions, gas-water ratio 9:1, stop 1.7h, Fe in PVA process units waste water after processing2+A concentration of 240mg/L；
Step 3：Fenton oxidation, the PVA process units waste water handled through iron-carbon micro-electrolysis enter Fenton oxidation reaction
H is added in pond2O2, a concentration of 1300mg/L, stirring reacted, stop 3.5h；
Step 4：Sodium hydroxide is added in flocculating setting in being discharged after Fenton oxidation, adjust pH to 7.3, be sufficiently stirred,
Iron ion in flocculating setting PVA process units waste water；
Step 5：Level-one is aerobic, enters level-one aerobic reaction tank after the sedimentation of PVA process units waste water flocculatings, is exposed using micropore
Gas method is aerated, and is maintained oxygen content in 3.5mg/L, sludge concentration 2.2g/L, is fully aerated, stops 17h；
Step 6：Two level is aerobic, and PVA process units waste water is after the processing of level-one aerobic reaction tank, into two level aerobic reaction
Pond is aerated using micro-pore aeration method, maintains oxygen content in 2.5mg/L, sludge concentration 2.8g/L, residence time 13h, warp
It is discharged after crossing secondary settling tank sedimentation.Detection water outlet COD is 45mg/L, reaches discharge standard requirement.
Comparative example 1:The PVA process units waste water of certain enterprise, COD 1600mg/L, pH 7.5, major pollutants are
PVA and acetate, processing step are as follows：
Step 1：Pretreatment, sulfuric acid is added into PVA process units waste water, its pH is adjusted to 2；
Step 2：Iron-carbon micro-electrolysis, above-mentioned pretreated PVA process units waste water enter iron-carbon micro-electrolysis reaction tank, expose
Solid/liquid/gas reactions, gas-water ratio 6:1, stop 1h, Fe in PVA process units waste water after processing2+A concentration of 100mg/L；
Step 3：Flocculating setting is added sodium hydroxide in iron-carbon micro-electrolysis water outlet, adjusts pH to 8, be sufficiently stirred, flocculates
Settle the iron ion in PVA process units waste water；
Step 4：Level-one is aerobic, enters level-one aerobic reaction tank after the sedimentation of PVA process units waste water flocculatings, is exposed using micropore
Gas method is aerated, and is maintained oxygen content in 4mg/L, sludge concentration 1.5g/L, is fully aerated, stops 20h；
Step 5：Two level is aerobic, and PVA process units waste water is after the processing of level-one aerobic reaction tank, into two level aerobic reaction
Pond is aerated using micro-pore aeration method, is maintained oxygen content in 2mg/L, sludge concentration 3g/L, residence time 5h, is sunk by two
It is discharged after the sedimentation of pond, detection water outlet COD is 120mg/L.Compared with Example 1, it is given birth to without the PVA that Fenton oxidation is handled
Device waste water is produced, aerobic merely through iron-carbon micro-electrolysis+two level, water outlet COD is exceeded.
Comparative example 2：The PVA process units waste water of certain enterprise, COD 1400mg/L, pH 7.3, major pollutants are
PVA and acetate, processing step are as follows：
Step 1：Pretreatment, sulfuric acid is added into PVA process units waste water, its pH is adjusted to 3.5；
Step 2：Iron-carbon micro-electrolysis, above-mentioned pretreated PVA process units waste water enter iron-carbon micro-electrolysis reaction tank, expose
Solid/liquid/gas reactions, gas-water ratio 9:1, stop 1.7h, Fe in PVA process units waste water after processing2+A concentration of 240mg/L；
Step 3：Fenton oxidation, the PVA process units waste water handled through iron-carbon micro-electrolysis enter Fenton oxidation reaction
H is added in pond2O2, a concentration of 1300mg/L, stirring reacted, stop 3.5h；
Step 4：Sodium hydroxide is added in flocculating setting in being discharged after Fenton oxidation, adjust pH to 7.3, be sufficiently stirred,
Iron ion in flocculating setting PVA process units waste water；
Step 5：It is aerobic, enter aerobic reaction tank after the sedimentation of PVA process units waste water flocculatings, is exposed using micro-pore aeration method
Gas maintains oxygen content to be discharged after secondary settling tank settles in 2.5mg/L, sludge concentration 2.8g/L, residence time 13h, examines
It is 90mg/L to measure water COD, compared with Example 5, aerobic using level-one, and PVA process units wastewater effluents COD is more than 60mg/
L cannot achieve qualified discharge.
The content not being described in detail in this specification belongs to the prior art well known to professional and technical personnel in the field.
Claims (8)
1. a kind of processing method of PVA process units waste water, which is characterized in that include the following steps：
Step 1, it pre-processes：Acid is added into PVA process units waste water, its pH is adjusted to 2~4；
Step 2, iron-carbon micro-electrolysis：Pretreated PVA process units waste water, into iron-carbon micro-electrolysis reaction tank, aeration reaction,
Gas-water ratio is 6:1~10:1,0.5~4h is stopped, PVA process units waste water is handled, PVA process units waste water after processing
Middle Fe2+A concentration of 100~300mg/L；
Step 3, Fenton oxidation：Through iron-carbon micro-electrolysis treated PVA process units waste water, reacted into Fenton oxidation
H is added in pond2O2, a concentration of 500~1500mg/L is sufficiently stirred and reacted, and stops 1~6h；
Step 4, flocculating setting：Alkali is added into the water outlet of Fenton oxidation reaction tank, between the pH to 7~8 for adjusting the water outlet,
It is sufficiently stirred, the iron ion in the flocculating setting water outlet；
Step 5, level-one is aerobic：After flocculating setting, the water outlet of Fenton oxidation reaction tank enters level-one aerobic reaction tank, and sludge is dense
Degree is 1.5~2.5g/L, is aerated using micro-pore aeration method, maintains oxygen content in 2~4mg/L, stops 8~22h；
Step 6, two level is aerobic：The water outlet of level-one aerobic reaction tank enters two level aerobic reaction tank, and sludge concentration is 2~3g/L,
It is aerated using micro-pore aeration method, maintains oxygen content in 2~4mg/L, the residence time is 3~17h, and two level aerobic reaction tank goes out
Water after secondary settling tank settles, discharge by the standard water discharge of secondary settling tank；
In step 1, the water quality of the PVA process units waste water is：COD a concentration of 1000~1600mg/L, pH are 6.5~7.5,
PVA contents are 300~400mg/L, and major pollutants are PVA and acetate.
2. the processing method of PVA process units waste water as described in claim 1, it is characterised in that：In step 1, the acid of addition
For sulfuric acid.
3. the processing method of PVA process units waste water as described in claim 1, it is characterised in that：In step 2, the residence time
For 1~2h.
4. the processing method of PVA process units waste water as described in claim 1, it is characterised in that：In step 3, the residence time
For 2~4h.
5. the processing method of PVA process units waste water as described in claim 1, it is characterised in that：In step 4, the alkali of addition
For sodium hydroxide or potassium hydroxide.
6. the processing method of PVA process units waste water as described in claim 1, it is characterised in that：In step 5, the residence time
For 10~20h.
7. the processing method of PVA process units waste water as described in claim 1, it is characterised in that：In step 6, the residence time
For 5~15h.
8. the processing method of PVA process units waste water as described in claim 1, it is characterised in that：In step 6, described two is heavy
The water outlet in pond, COD are less than 60mg/L, meet《Integrated wastewater discharge standard (GB8978-1996)》Two pollutant level-ones are arranged
Put standard requirement.
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| CN106145467A (en) * | 2016-08-26 | 2016-11-23 | 南京白云化工环境监测有限公司 | A kind of device processed containing PVA high concentrated organic wastewater and technique |
| CN109502857A (en) * | 2017-09-15 | 2019-03-22 | 上海江柘环境工程技术有限公司 | A kind of processing equipment and its processing method of polyvinyl chloride centrifugation mother liquid waste water |
| CN111285555A (en) * | 2020-03-24 | 2020-06-16 | 山东高科联合环保科学研究院有限公司 | Fenton and biological oxidation combined process and device with low medicament addition |
| CN111233286A (en) * | 2020-03-30 | 2020-06-05 | 河南君和环保科技有限公司 | Aerobic biochemical treatment tail water retreatment process for APMP pulping wastewater |
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