CN102718353B - System of and method for advanced treatment of refractory industrial wastewater - Google Patents
System of and method for advanced treatment of refractory industrial wastewater Download PDFInfo
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- CN102718353B CN102718353B CN2011100777331A CN201110077733A CN102718353B CN 102718353 B CN102718353 B CN 102718353B CN 2011100777331 A CN2011100777331 A CN 2011100777331A CN 201110077733 A CN201110077733 A CN 201110077733A CN 102718353 B CN102718353 B CN 102718353B
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Abstract
The invention discloses a system of and a method for advanced treatment of refractory industrial wastewater, wherein the system comprises a pH regulating tank, a catalytic oxidation tank, a flocculation deposit tank, an intermediate water tank and a biological aeration filter, and the process comprises collecting industrial wastewater into the pH regulating tank, adding H2SO4 into the pH regulating tank to regulate the pH value of the wastewater to 3.5-4.5, then putting the wastewater into the catalytic oxidation tank, adding H2O2 and FeSO4 into the catalytic oxidation tank for catalytic oxidation, then adding NaOH or Na2CO3 to the flocculation deposit tank, regulating the pH value to 8.5-9.0, and leading the wastewater treated through the abovementioned steps into the intermediate water tank and the biological aeration filter in turn to further remove CODCr. The system and method are characterized by simple process flow, easy operation and management, relatively low operation cost and excellent treatment effect.
Description
Technical field
The invention belongs to the advanced treatment of industrial waste water technical field, be specifically related to a kind of indegradable industrial effluent advanced treatment system and method, can be used as advanced treatment, after being connected in existing Waste Water Treatment water outlet, further remove COD in waste water
Cr, the index such as hardness, basicity, water outlet can meet reuse or as the desalination pre-treatment
Background technology
In recent years, along with the frequent generation of all kinds of water pollution incidents, the raising of sewage drainage standard, have higher requirement to enterprise, how can better utilize sewage resource, reduces the discharge of sewage, realizes that recycle becomes important task of enterprise.
After advanced treatment of industrial waste water, reuse is the important channel of realizing water-saving and emission-reducing, controlling the water pollution.Trade effluent water quality is with the heterogeneity more complicated of production technique and the mode of production.The most industry waste water matter water yield changes greatly, and saltiness is high, and part contains hazardous and noxious substances, reuse after being difficult to direct reuse or adopting conventional processing.
The technology adopted in the current industrial wastewater treatment mainly contains advanced oxidation processes, reverse osmosis, conventional biological treatment etc., has obtained certain effect, but has also had certain problem.Most industry waste water is after second-stage treatment, and biochemical is poor, processes as direct employing biological process, and treatment effect is poor, COD
CrEtc. the clearance of index of correlation, do not reach the standard of reuse; As direct employing chemical method, processing cost is higher, and economic benefit is poor.
Along with the fast development of reverse osmosis technology, more and more extensive in the application in Industrial Wastewater Treatment field, living fouling and chemical fouling are also more outstanding on its impact.Give birth to fouling and chemical fouling and make the reverse osmosis desalination rate descend and the producing water ratio reduction, greatly shortened the cycle of operation, become the critical limitation factor that reverse osmosis is used.For the water quality characteristic of trade effluent, in conjunction with the problem that existing treatment technology exists, research and develop suitable advanced treatment of industrial waste water system and have important society and economic benefit.
Summary of the invention
The objective of the invention is characteristics and difficulty in treatment for indegradable industrial effluent, a kind of indegradable industrial effluent advanced treatment system and method are provided.The native system technical process is simple, the easy handling management, and working cost is lower, and treatment effect is good.Waste water COD after processing
CrClearance reaches more than 60%, and the hardness clearance reaches more than 65%, as a kind of pretreatment process of desalination, can effectively alleviate the dirty stifled and chemical scale formation of microorganism that organism and hardness etc. are brought, and solves the difficult problem in the reverse osmosis operational process.
In order to reach above-mentioned purpose of design, the technical solution used in the present invention is as follows:
A kind of indegradable industrial effluent advanced treatment system, mainly comprise pH regulator pond, catalyzed oxidation pond, flocculation sedimentation tank, intermediate pool and BAF, described pH regulator pond is for regulating wastewater pH to mild catalytic oxidation pH scope, and water outlet is connected to the catalyzed oxidation pond; The catalyzed oxidation pond has been used for the mild catalytic oxidizing reaction, improves the biodegradability of waste water, tentatively removes COD
Cr, dosing mouth being set be used to adding catalyzer and oxygenant in pond, the outlet of catalyzed oxidation pond is connected to flocculation sedimentation tank; Described flocculation sedimentation tank comprises reaction zone and settling region, and the reaction zone entrance is connected with the catalyzed oxidation pond, dosing mouth in pond, for adding alkali and flocculation agent, water outlet enters the post precipitation district by bottom, and inside, settling region arranges swash plate, bottom arranges mud discharging mouth, and water outlet is connected to intermediate pool; The built-in sewage pump of intermediate pool, lifting sewage is to follow-up BAF, and BAF has been used for biochemical reaction, further removes COD
CrAdopt lower water inlet upper water-out mode, choose particle diameter and be the haydite of 3～6mm as aerating biological filter pool filler, inside is provided for water distributor and the gas distribution pipe of back flushing, BAF arranges water port, backwash water inlet and backwash water port, and the backwash draining is connected to flocculation sedimentation tank.
A kind of deep treatment method of indegradable industrial effluent, adopt the mode of catalyzed oxidation and biological treatment, but make the processed waste water direct reuse or as the pre-treatment of desalting treatment; Concrete steps are: collect the trade effluent secondary treatment yielding water to the pH regulator pond, add H in the pH regulator pond
2SO
4Regulate waste water ph to 3.5～4.5, standing 0.5h; Afterwards the waste water of pH value to 3.5 is sent into to the catalyzed oxidation pond, in the waste water that regulates the pH value, add simultaneously H in the catalyzed oxidation pond
2O
2And FeSO
4, to carry out catalyzed oxidation, the catalyzed oxidation time is 2h; The waste water that completes oxidation is carried out to flocculation precipitation reaction 30min at flocculation sedimentation tank, then to flocculation sedimentation tank, add NaOH or Na
2CO
3, regulate pH value to 8.5～9.0 precipitation 2.0～2.5h, utilize iron ion in solution as flocculation agent, add simultaneously polyacrylamide as coagulant aids, iron ion, hardness in removal waste water; Waste water after above-mentioned processing enters intermediate pool, and standing 1h finally enters BAF, further removes COD
Cr.
Described COD
CrBe Chemical Oxygen Demand, be the meaning of chemical oxygen demand, also claim to be called for short " chemical oxygen demand (COD) " " oxygen-consumption ".Amount of oxygen with consuming during aerobic pollution matter in chemical oxidizing agent (as potassium permanganate, potassium bichromate) oxidizing water, often mean with symbol COD.Measure unit is mg/L.It is one of important overall target of evaluation water pollution degree.In environment (synonym in presents) system refer to difficult degradation in waste water pollutent its reflected the degree that polluted by reducing substances, this index is also as one of the overall target of organism relative content in waste water.
The beneficial effect of indegradable industrial effluent advanced treatment system of the present invention and method is: for treatment process and the main design and operation parameter of indegradable industrial effluent advanced treatment and reuse, adopt this treatment process, can effectively remove hardness and basicity in waste water, appropriate oxidation by early stage, guarantee the effect of biochemical treatment, water outlet COD after processing
CrBe less than 20mg/L.But waste water direct reuse or as the pre-treatment of desalination system after treatment.
The accompanying drawing explanation
Fig. 1 is the process flow sheet of the described indegradable industrial effluent advanced treatment system of the embodiment of the present invention and method.
Embodiment
Be noted that following detailed description is all exemplary, is intended to the invention provides further instruction.Unless otherwise, all technology used herein and scientific terminology have the identical meanings of usually understanding with the general technical staff of the technical field of the invention.
As shown in Figure 1, the described indegradable industrial effluent advanced treatment system of the embodiment of the present invention, mainly comprise pH regulator pond, catalyzed oxidation pond, flocculation sedimentation tank, intermediate pool and BAF, described pH regulator pond is for regulating wastewater pH to mild catalytic oxidation pH scope, and water outlet is connected to the catalyzed oxidation pond; The catalyzed oxidation pond has been used for the mild catalytic oxidizing reaction, improves the biodegradability of waste water, tentatively removes COD
Cr, dosing mouth being set be used to adding catalyzer and oxygenant in pond, the outlet of catalyzed oxidation pond is connected to flocculation sedimentation tank; Described flocculation sedimentation tank comprises reaction zone and settling region, and the reaction zone entrance is connected with the catalyzed oxidation pond, dosing mouth in pond, for adding alkali and flocculation agent, water outlet enters the post precipitation district by bottom, and inside, settling region arranges swash plate, bottom arranges mud discharging mouth, and water outlet is connected to intermediate pool; The built-in sewage pump of intermediate pool, lifting sewage is to follow-up BAF, and BAF has been used for biochemical reaction, further removes COD
CrAdopt lower water inlet upper water-out mode, choose particle diameter and be the haydite of 3～6mm as aerating biological filter pool filler, inside is provided for water distributor and the gas distribution pipe of back flushing, BAF arranges water port, backwash water inlet and backwash water port, and the backwash draining is connected to flocculation sedimentation tank.
The described indegradable industrial effluent advanced treatment system of the embodiment of the present invention, also comprise sludge thickener, for the mud that flocculation sedimentation tank is produced, carry out concentration, described sludge thickener is connected with described flocculation sedimentation tank mud discharging mouth, and sludge thickener is connected to sludge dewatering system.
Describedly in pH regulator pond, catalyzed oxidation pond and flocculation sedimentation tank, whipping appts is set, for reaction process Chinese medicine mixing at waste water.
Described pH regulator arranges aeration tube in pond, for gas stirring, waste water is fully mixed and remove basicity in waste water.
Described pH regulator is provided with the pH monitor in pond, be used to measuring the pH value of liquid, to control the dosage of medicament.
The deep treatment method of the described indegradable industrial effluent of the embodiment of the present invention, be the mode that adopts catalyzed oxidation and biological treatment, but make the processed waste water direct reuse or as the pre-treatment of desalting treatment.
Its concrete steps are: collect the trade effluent secondary treatment yielding water to the pH regulator pond, add H in the pH regulator pond
2SO
4Regulate waste water ph to 3.5～4.5, standing 0.5h; Afterwards the waste water of pH value to 3.5 is sent into to the catalyzed oxidation pond, in the waste water that regulates the pH value, add simultaneously H in the catalyzed oxidation pond
2O
2And FeSO
4, to carry out catalyzed oxidation, the catalyzed oxidation time is 2h; The waste water that completes oxidation is carried out to flocculation precipitation reaction 30min at flocculation sedimentation tank, then to flocculation sedimentation tank, add NaOH or Na
2CO
3, regulate pH value to 8.5～9.0 precipitation 2.0～2.5h, utilize iron ion in solution as flocculation agent, add simultaneously polyacrylamide as coagulant aids, iron ion, hardness in removal waste water; Waste water after above-mentioned processing enters intermediate pool, and standing 1h finally enters BAF, further removes COD
Cr.
Described oxygenant H
2O
2Concentration be 30%, H
2O
2Dosage and waste water COD
CrMass concentration ratio is 1.4: 1, catalyst Fe SO
4Dosage and waste water COD
CrThe ratio of mass concentration is 0.41: 1.
Described polyacrylamide dosage: 5mg/L.
The void tower flow velocity of described BAF is 2.5～3.5m/h, and hydraulic detention time is controlled at 40～60min, and gas-water ratio is 1: 1, and backwashing period is 5d.
Embodiment 1
A citric acid production producer, collect its production wastewater treatment system outlet water at tail end, it to be tested, the pH value is 7.5, COD
CrFor 90mg/L, hardness is 1000mg/L.
Utilize volume pump to add H
2SO
4Solution, process water outlet pH value by the factory effluent end and be adjusted to 3.5, and pH regulator arranges stirrer in pond, reaches the pH instrument and shows and control the acid adding amount, and the pH regulator pond residence time is 30min.
After regulating pH, the waste water gravity flow enters the mild catalytic oxidation pond, utilizes volume pump to add H at reaction zone
2O
2(concentration is 30%) and FeSO
4, be provided with stirrer, reaction times 120min.After reaction, gravity flow enters the flocculation sediment district, utilizes volume pump to add NaOH, and the pH value is adjusted to 8.5, and be beneficial to afterwards volume pump and add coagulant aids polyacrylamide 5mg/L, reaction precipitation 2.0h, after reaction, gravity flow enters intermediate pool, hydraulic detention time 1h.
In intermediate pool, waste water is promoted to BAF through lift pump, hydraulic detention time 40min.
Biochemistry pool water outlet priority pollutant index is as shown in table 1.
Table 1 is processed the principal pollutant index of rear water outlet
As can be known by data in table 1, the waste water of discharging through waste water treatment process of the present invention effectively reduces organism and hardness, can be used as the pre-treatment of desalination system, guarantees its operation steady in a long-term.
In this Practical Project example, this system arranges the PLC system, for according to liquid level in pond, controlling the lift pump start and stop, controlling the start and stop of dosing volume pump, and regulate fan operation time and the air quantity that is used for the biochemical treatment unit according to pH value.
Embodiment 2
A citric acid production producer, collect its production wastewater treatment system outlet water at tail end, it to be tested, the pH value is 8.5, COD
CrFor 120mg/L, hardness is 1200mg/L.
Utilize volume pump to add H
2SO
4Solution, process water outlet pH value by the factory effluent end and be adjusted to 4.5, and pH regulator arranges stirrer in pond, reaches the pH instrument and shows and control the acid adding amount, and the pH regulator pond residence time is 30min.
After regulating pH, the waste water gravity flow enters the mild catalytic oxidation pond, utilizes volume pump to add H at reaction zone
2O
2(concentration is 30%) and FeSO
4, be provided with stirrer, reaction times 120min.After reaction, gravity flow enters the flocculation sediment district, utilizes volume pump to add Na
2CO
3, the pH value is adjusted to 9.0, be beneficial to afterwards volume pump and add coagulant aids polyacrylamide 5mg/L, reaction precipitation 2.5h,, after reaction, gravity flow enters intermediate pool, hydraulic detention time 1h.
In intermediate pool, waste water is promoted to BAF through lift pump, hydraulic detention time 60min.
Biochemistry pool water outlet priority pollutant index is as shown in table 1.
Table 2 is processed the principal pollutant index of rear water outlet
As can be known by data in table 2, the waste water of discharging through waste water treatment process of the present invention effectively reduces organism and hardness, can be used as the pre-treatment of desalination system, guarantees its operation steady in a long-term.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (1)
1. the deep treatment method of an indegradable industrial effluent is characterized in that: adopt the mode of catalyzed oxidation and biological treatment, but make the processed waste water direct reuse or as the pre-treatment of desalting treatment; Concrete steps are: collect the trade effluent secondary treatment yielding water to the pH regulator pond, add H in the pH regulator pond
2SO
4Regulate waste water ph to 3.5～4.5, standing 0.5h; Afterwards the waste water of pH value to 3.5 is sent into to the catalyzed oxidation pond, in the waste water that regulates the pH value, add simultaneously H in the catalyzed oxidation pond
2O
2And FeSO
4, to carry out catalyzed oxidation, the catalyzed oxidation time is 2h; The waste water that completes catalyzed oxidation is carried out to flocculation precipitation reaction 30min at flocculation sedimentation tank, then to flocculation sedimentation tank, add NaOH or Na
2CO
3, regulating pH value to 8.5～9.0, precipitation 2.0～2.5h, utilize iron ion in solution as flocculation agent, adds simultaneously polyacrylamide as coagulant aids, removes iron ion, reduction hardness in waste water; Waste water after above-mentioned processing enters intermediate pool, and standing 1h finally enters BAF, further removes COD
Cr
Described oxygenant H
2O
2Concentration be 30%, H
2O
2Dosage and waste water COD
CrMass concentration ratio is 1.4:1, catalyst Fe SO
4Dosage and waste water COD
CrThe ratio of mass concentration is 0.41:1;
Described polyacrylamide dosage: 5mg/L;
The void tower flow velocity of described BAF is 2.5～3.5m/h, and hydraulic detention time is controlled at 40～60min, and gas-water ratio is 1:1, and backwashing period is 5d.
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| CN2011100777331A CN102718353B (en) | 2011-03-30 | 2011-03-30 | System of and method for advanced treatment of refractory industrial wastewater |
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| CN103979735B (en) * | 2014-05-21 | 2015-07-22 | 青岛中通臭氧科技有限公司 | Process and device for treating refractory industrial wastewater |
| CN103992009A (en) * | 2014-05-26 | 2014-08-20 | 南京工业大学 | PBOB treatment process for toxic organic chemical wastewater |
| CN106045124B (en) * | 2016-07-15 | 2019-01-29 | 华东理工大学 | A method of residual organic matter in removal bio-reaction system water outlet |
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| CN107572692A (en) * | 2017-09-27 | 2018-01-12 | 江苏八达科技股份有限公司 | The method and its device of antioxidant in a kind of removal sewage |
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| CN110668638A (en) * | 2019-09-24 | 2020-01-10 | 鲁西化工集团股份有限公司 | System and method for deep treatment of wastewater containing high-concentration organic amine |
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| CN114772795B (en) * | 2022-05-25 | 2024-01-02 | 福建省金皇环保科技有限公司 | Catalytic oxidation coagulation precipitation integrated sewage treatment process |
| CN116375171B (en) * | 2023-04-07 | 2024-05-03 | 中复神鹰碳纤维股份有限公司 | Continuous catalytic oxidation process for DMSO-containing industrial wastewater |
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| CN101767914B (en) * | 2010-01-12 | 2011-09-21 | 广西博世科环保科技股份有限公司 | Method for treating garbage leachate |
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