CN110092524B - Method and system for treating high-concentration phosphating wastewater - Google Patents
Method and system for treating high-concentration phosphating wastewater Download PDFInfo
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- CN110092524B CN110092524B CN201910387380.1A CN201910387380A CN110092524B CN 110092524 B CN110092524 B CN 110092524B CN 201910387380 A CN201910387380 A CN 201910387380A CN 110092524 B CN110092524 B CN 110092524B
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- 238000000034 method Methods 0.000 title claims abstract description 44
- 239000002351 wastewater Substances 0.000 title claims abstract description 42
- 238000002156 mixing Methods 0.000 claims abstract description 72
- 239000000701 coagulant Substances 0.000 claims abstract description 26
- 238000003756 stirring Methods 0.000 claims abstract description 22
- 239000006247 magnetic powder Substances 0.000 claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 44
- 238000000926 separation method Methods 0.000 claims description 14
- 238000012544 monitoring process Methods 0.000 claims description 10
- 230000007935 neutral effect Effects 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 4
- 238000006116 polymerization reaction Methods 0.000 claims description 2
- 229920002401 polyacrylamide Polymers 0.000 abstract description 15
- 238000005345 coagulation Methods 0.000 abstract description 5
- 230000015271 coagulation Effects 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 abstract description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 abstract description 2
- 239000003814 drug Substances 0.000 abstract description 2
- 238000004065 wastewater treatment Methods 0.000 abstract description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 46
- 239000003344 environmental pollutant Substances 0.000 description 17
- 231100000719 pollutant Toxicity 0.000 description 17
- 230000000694 effects Effects 0.000 description 13
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 12
- 229910052698 phosphorus Inorganic materials 0.000 description 12
- 239000011574 phosphorus Substances 0.000 description 12
- 238000005188 flotation Methods 0.000 description 11
- 238000006243 chemical reaction Methods 0.000 description 9
- 238000001556 precipitation Methods 0.000 description 8
- 229910052759 nickel Inorganic materials 0.000 description 6
- 239000010865 sewage Substances 0.000 description 6
- 229910019142 PO4 Inorganic materials 0.000 description 5
- 230000033228 biological regulation Effects 0.000 description 5
- 238000005189 flocculation Methods 0.000 description 5
- 230000016615 flocculation Effects 0.000 description 5
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 5
- 239000010452 phosphate Substances 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 239000008394 flocculating agent Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 238000004062 sedimentation Methods 0.000 description 4
- 238000001179 sorption measurement Methods 0.000 description 4
- 229940037003 alum Drugs 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000005086 pumping Methods 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 239000010802 sludge Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 229910001385 heavy metal Inorganic materials 0.000 description 2
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- 239000002253 acid Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009395 breeding Methods 0.000 description 1
- 230000001488 breeding effect Effects 0.000 description 1
- 238000009388 chemical precipitation Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000001112 coagulating effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 238000012777 commercial manufacturing Methods 0.000 description 1
- 150000001879 copper Chemical class 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
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- 229910052593 corundum Inorganic materials 0.000 description 1
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- 238000002848 electrochemical method Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000011859 microparticle Substances 0.000 description 1
- -1 nickel salt Chemical class 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
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- 150000003839 salts Chemical class 0.000 description 1
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- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- 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
- C02F1/24—Treatment of water, waste water, or sewage by flotation
-
- 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
- C02F1/48—Treatment of water, waste water, or sewage with magnetic or electric fields
- C02F1/488—Treatment of water, waste water, or sewage with magnetic or electric fields for separation of magnetic materials, e.g. magnetic flocculation
-
- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
-
- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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- 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
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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
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus 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
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal 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
- C02F2303/00—Specific treatment goals
- C02F2303/04—Disinfection
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
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- Organic Chemistry (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
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Abstract
The invention relates to the field of wastewater treatment, in particular to a method for treating high-concentration phosphating wastewater, which comprises the following steps: (1) adding a coagulant PAC (polyaluminium chloride) and magnetic powder into the phosphatizing wastewater, and stirring and mixing to obtain a primary mixing system; (2) adding a coagulant aid PAM (polyacrylamide) into the primary mixed system, stirring and mixing to obtain a secondary mixed system; (3) the method combines the magnetic coagulation and air floatation technologies, not only reduces the usage amount of the medicament, but also reduces the processing time and the occupied area, and improves the processing efficiency.
Description
Technical Field
The invention relates to the field of wastewater treatment, in particular to a method and a system for treating high-concentration phosphating wastewater.
Background
The phosphating process is a process of immersing a metal workpiece into phosphate solution for chemical treatment and forming an insoluble phosphate film on the surface of the metal by using solution containing phosphoric acid or phosphate, and is a previous process of an automobile coating process. In industrial production, Mn is usually added to a phosphating solution in order to increase the corrosion resistance of a phosphating film and the effect of increasing the adhesion of a coating to a metal substrate2+、Ni2+、Cu2+The heavy metal ions or metal salts (such as copper salt and nickel salt) with more positive potential than iron can shorten the film forming time, reduce the crystal size, change the crystal form, and improve the protective property and alkali resistance of the filmAnd coatability. Wherein the nickel has more remarkable effect, and the excessive nickel does not cause adverse effect, thereby improving the performance of the phosphating solution.
The phosphating process generally comprises alkali cleaning for removing oil, acid cleaning for removing rust, phosphating and passivation treatment, and a large amount of pollutants, particularly large discharge amount of phosphate and serious overproof, are generated in the process. The method for treating the phosphating wastewater has a plurality of methods, and the specific methods comprise a coagulation method, an adsorption method, an electrochemical method, an ion exchange method, a precipitation method and the like.
At present, the chemical precipitation method is usually adopted to treat the phosphorization wastewater, which is an effective and practical treatment method and has the characteristics of simple operation, good treatment effect, less medicament consumption and remarkable economic benefit. Coagulating sedimentation is a common solid-liquid separation technology, and is characterized in that a flocculating agent and a coagulant aid are added into water to coagulate suspended matters and colloids in wastewater into flocs with larger particle sizes, and the flocs are precipitated in a sedimentation tank, so that the aim of purifying water is fulfilled. However, the flocculant is usually added with a large amount of chemicals, the sedimentation rate of the floc is slow, and the like, so that the flocculant occupies a large area, has a complex structure, is difficult to operate, has a poor use effect, and does not meet the actual use requirements.
Disclosure of Invention
The invention provides a method for treating high-concentration phosphating wastewater, which can be used for quickly and efficiently removing phosphorus in the wastewater by combining a magnetic coagulation and air-flotation separation technology.
A treatment method of high-concentration phosphating wastewater comprises the following steps:
(1) and adding a coagulant PAC (polyaluminium chloride) and magnetic powder into the phosphatizing wastewater, and stirring and mixing to obtain a primary mixing system.
(2) Adding a coagulant aid PAM (polyacrylamide) into the primary mixed system, stirring and mixing to obtain a secondary mixed system;
(3) and (4) carrying out air floatation separation on the secondary mixed system by adopting an air floatation machine to obtain effluent and scum.
Preferably, the pH range of the phosphating wastewater is 7-9.
The pH range can ensure that the wastewater can maintain PAC flocculation in the flocculation reaction tank and ensure that heavy metals can be precipitated; in addition, the treatment effect is best under neutral conditions.
The coagulant has stronger adsorption capacity and good effect on the coagulation and precipitation of pollutants, however, since the alum floc generated after the coagulant treatment is small, some small alum floc and fine pollutants are remained when the pollutants are removed, so that the breeding of secondary pollution is easily caused, and the ideal effect is not achieved. Therefore, a flocculating agent is added after the coagulant is used, and the flocculating agent flocculates small alum flocs and small suspended pollutants of the coagulated sediment into large flocs and then removes the large flocs, so that the effect is good.
Preferably, the PAC has a degree of polymerization m ≦ 10 and a degree of neutrality n of 1 to 5.
Preferably, the ion degree of the PAM is 20-50%, and the molecular weight is 800-1800 ten thousand.
Preferably, the magnetic powder has an average particle size of 400 mesh.
Preferably, in the step (1), the adding amount of the PAC is 50-100mg/L, and the adding amount of the magnetic powder is 10-20 mg/L.
Preferably, in the step (2), the dosage of the PAM is 20-30 mg/L.
Preferably, in the step (1), the stirring and mixing time is 20-40 min.
Preferably, in the step (2), the stirring and mixing time is 20-40 min.
The invention also provides a process system based on the method, and the system has the characteristics of simple structure, short time consumption, small occupied area and high treatment efficiency.
The treatment system sequentially comprises a water inlet pipe, a primary mixing tank, a secondary mixing tank, an air flotation tank and a water outlet pipe, wherein the primary mixing tank, the secondary mixing tank and the air flotation tank are communicated sequentially through a conveying pipeline, wastewater is introduced into the primary mixing tank from the water inlet pipe, a primary mixing tank system is formed in the primary mixing tank through forced stirring with a coagulant PAC and magnetic powder, the primary mixing system flows into the secondary mixing tank through the conveying pipeline, a secondary mixing system is formed in the secondary mixing tank through forced stirring with a coagulant aid PAM, the secondary mixing system flows into the air flotation tank through the conveying pipeline, scum and effluent are separated from the air flotation tank of the secondary mixing system, and the effluent is discharged out of the air flotation tank through the water outlet pipe.
Preferably, be equipped with the automatic regulation and control system of pH that is used for adjusting into water pH on the inlet tube, pH initiative regulation and control system is including the pipe-line mixer that is used for monitoring into water flow and the monitor of pH and adjusts into water pH.
Preferably, the outlet pipe is provided with a Ni content monitor, a return pipe is arranged behind the Ni content monitor, the return pipe is communicated with the inlet pipe, the return pipe is provided with a valve I, the outlet pipe is further provided with a valve II, and the valves I and II and the Ni content monitor.
The Ni content monitor is used for monitoring the Ni content in water, when the monitor monitors that the Ni content in the water exceeds the highest allowable discharge concentration of 1mg/L of pollutants of the first class of Integrated wastewater discharge Standard (GB 8978-1996), the monitor controls the valve II to close, and simultaneously opens the valve I, so that the water with the Ni content which does not reach the standard enters the system from the water inlet pipe again for secondary treatment, and when the Ni content in the water reaches the standard, the Ni content monitor controls the valve I to close, the valve II is opened, and the water enters the next stage of treatment.
The invention has the beneficial effects that:
1. in the magnetic coagulation process of the method, the formed floccule is more compact and firmer, the adsorption effect is better, but the tighter and the more easily the floccule is precipitated, generally, a sedimentation tank is adopted to separate the floccule from water.
2. The phosphate removal rate of the method is as high as 60-90%, and the Ni content in the effluent can reach the discharge standard of the first class of pollutants in Integrated wastewater discharge Standard (GB 8978-1996).
3. The magnetic powder and the flocculating agent added in the method have good adsorption effect on bacteria, viruses, oil and various micro particles, so that the removal effect on the pollutants is better than that of the traditional process.
4. The magnetic substance added in the method can adsorb more pollutants, accelerate the precipitation of phosphorus-containing flocs, greatly shorten the precipitation time and shorten the retention time of the whole process, so the probability of the occurrence of a reverse dissolution process of most pollutants including TP is very small.
5. The method has the advantages of simple control and operation of air floatation separation, fine and uniform dispersion of bubbles generated by the air dissolving system, greatly improved air floatation treatment effect compared with similar products, energy saving, system supporting equipment saving, space saving, no blockage, easy maintenance and the like.
Drawings
FIG. 1 is a schematic view of a system for treating high-concentration phosphating wastewater.
1-water inlet pipe, 11-pH automatic regulation system, 2-first stage mixing tank, 3-second stage mixing tank, 4-air floatation tank, 5-water outlet pipe, 51-Ni content monitor, 52-return pipe and 6-conveying pipeline.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
It should be noted that: PAC used in the examples contains Al2O3Not less than 28%, purchased from Citian Rexin water supply materials factory of Gui Yi city; the used PAM has the molecular weight of 800 ten thousand and the solid content of more than or equal to 90 percent and is purchased from Puyang commercial manufacturing company Limited; the magnetic powder has a particle size of 400 mesh and is purchased from Shanghai Seawa Material science and technology Co. Other reagents and materials used in the examples are commercially available unless otherwise specified.
Example 1
Referring to fig. 1, a treatment system for high concentration phosphating wastewater; include inlet tube 1 in proper order, one-level mixing tank 2, second grade mixing tank 3, air supporting pond 4 and outlet pipe 5, one-level mixing tank 2, loop through pipeline 6 intercommunication between second grade mixing tank 3 and the air supporting pond 4, waste water connects into one-level mixing tank 2 from inlet tube 1, in one-level mixing tank 2 with coagulant PAC and magnetic force the stirring and form one-level mixing tank system, one-level mixing system flows into second grade mixing tank 3 through pipeline 6, in second grade mixing tank 3 with coagulant aid PAM force the stirring and form second grade mixing system, second grade mixing system flows into air supporting pond 4 through pipeline 6, second grade mixing system air supporting pond separation is dross and play water, play water meets out the air supporting pond through the outlet pipe.
Be equipped with the automatic regulation and control system of pH that is used for adjusting into water pH on the inlet tube 1, pH initiative regulation and control system is including the pipe-line mixer that is used for monitoring the monitor of inflow and pH and adjusts into water pH.
The water outlet pipe 5 is provided with a Ni content monitor 51, a return pipe 52 is arranged behind the Ni content monitor, the return pipe 52 is communicated with the water inlet pipe 1, the return pipe 52 is provided with a valve I, the water outlet pipe 5 is also provided with a valve II, and the valves I and II and the Ni content monitor 51.
The Ni content monitor is used for monitoring the Ni content in water, when the monitor monitors that the Ni content in the water exceeds the highest allowable discharge concentration of 1mg/L of pollutants of the first class of Integrated wastewater discharge Standard (GB 8978-1996), the monitor controls the valve II to close, and simultaneously opens the valve I, so that the water with the Ni content which does not reach the standard enters the system from the water inlet pipe again for secondary treatment, and when the Ni content in the water reaches the standard, the Ni content monitor controls the valve I to close, the valve II is opened, and the water enters the next stage of treatment.
Example 2
A method for treating high-concentration phosphating wastewater,
the average COD of the sewage to be treated is 251.637 mg/L, the average total phosphorus concentration is 267.851 mg/L, the average total nickel content is 14.332mg/L, and the sewage is treated according to the following steps:
(1) adjusting the pH value: regulating and controlling the pH value of the phosphating wastewater in real time on line to be stabilized in a neutral range of 6-7;
(2) mixing at the level of 1: pumping the phosphorization wastewater into a flocculation reaction tank through a lift pump, adding 50mg/L PAC coagulant and 10mg/L magnetic powder, stirring, mixing and reacting for 25min to form a primary mixing system;
(3) 2, mixing: the primary mixed system enters a coagulation-aiding reaction tank, 20mg/L of PAM coagulant aid is added, and the mixture is stirred and mixed for reaction for 25min to form a secondary mixed system;
(4) air flotation separation: and the secondary mixing system enters an air floatation tank, stays for 60min, is subjected to air floatation separation, scum enters a sludge tank for treatment, and effluent enters a water outlet pipe.
(5) Monitoring the Ni content: and (3) monitoring the effluent by a Ni content monitor, wherein the Ni content reaches the standard, opening a valve II, and treating the effluent in the next stage.
After treatment, the average COD content of the effluent is 75.254mg/L, and the removal rate is 70%; the total phosphorus content is 45.329mg/L, and the removal rate is 83 percent; the Ni content is 0.957mg/L, the removal rate is 93 percent, and the maximum allowable discharge concentration of the first pollutant of Integrated wastewater discharge Standard (GB 8978-1996) is 1 mg/L.
Example 3
A method for treating high-concentration phosphating wastewater,
the average COD of the sewage to be treated is 370.311 mg/L, the average total phosphorus concentration is 273.862 mg/L, the average total nickel content is 16.663mg/L, and the sewage is treated according to the following steps:
(1) adjusting the pH value: regulating and controlling the pH value of the phosphating wastewater in real time on line to be stabilized in a neutral range of 6-7;
(2) mixing at the level of 1: pumping the phosphorization wastewater into a flocculation reaction tank through a lift pump, adding 75mg/L PAC coagulant and 15mg/L magnetic powder, stirring, mixing and reacting for 30min to form a primary mixing system;
(3) 2, mixing: and the mixed system enters a coagulation-aiding reaction tank, 30mg/L of PAM coagulant aid is added, and the mixed system is stirred, mixed and reacted for 30min to form a secondary mixed system;
(4) air flotation separation: the second-stage mixed system enters an air floatation tank, stays for 80min, is subjected to air floatation separation, scum enters a sludge tank for treatment, and effluent enters a water outlet pipe;
(5) monitoring the Ni content: the effluent is monitored by a Ni content monitor, the Ni content reaches the standard, the valve 2 is opened, and the effluent enters the next stage of treatment.
After treatment, the average COD content of the effluent is 62.012mg/L, and the removal rate is 83%; the total phosphorus content is 37.134mg/L, and the removal rate is 86%; the Ni content is 0.940mg/L, the removal rate is 94 percent, and the maximum allowable discharge concentration of the first class of pollutants of Integrated wastewater discharge Standard (GB 8978-1996) is 1 mg/L.
Example 4
A method for treating high-concentration phosphating wastewater,
the average COD of the sewage to be treated is 530.938 mg/L, the average total phosphorus concentration is 305.916mg/L, the average total nickel content is 17.707mg/L, and the sewage is treated according to the following steps:
(1) adjusting the pH value: regulating and controlling the pH value of the phosphating wastewater in real time on line to be stabilized in a neutral range of 6-7;
(2) mixing at the level of 1: pumping the phosphorization wastewater into a flocculation reaction tank through a lift pump, adding 100mg/L PAC coagulant and 20mg/L magnetic powder, stirring, mixing and reacting for 40min to form a primary mixing system;
(3) 2, mixing: the primary mixed system enters a coagulation-aiding reaction tank, 40mg/L of PAM coagulant aid is added, and the mixture is stirred and mixed for reaction for 40min to form a secondary mixed system;
(4) air flotation separation: and the secondary mixing system enters an air floatation tank, stays for 90min, the scum enters a sludge tank for treatment, and the effluent enters a water outlet pipe.
(5) Monitoring the Ni content: and (3) monitoring the effluent by a Ni content monitor, wherein the Ni content reaches the standard, opening a valve II, and treating the effluent in the next stage.
After treatment, the average COD content of the effluent is 71.342mg/L, and the removal rate is 87%; the total phosphorus content is 28.411mg/L, and the removal rate is 91%; the Ni content is 0.849mg/L, the removal rate is 96%, and the maximum allowable discharge concentration of the first pollutant is 1mg/L in the Integrated wastewater discharge Standard (GB 8978-1996).
Comparative example 1
Adding 100mg/L PAC coagulant and 20mg/L magnetic powder into the mixture at the level of 1, and stirring, mixing and reacting for 25 min; adding 40mg/L PAM coagulant aid into the 2-stage mixture, and stirring, mixing and reacting for 25 min; the separation process does not adopt an air flotation process, adopts a precipitation process, increases the precipitation time to 120min, and has the same other conditions as the example 2. The COD content of the treated effluent is 74.161mg/L averagely, and the removal rate is 71 percent; the total phosphorus content is 50.024mg/L, and the removal rate is 81 percent; the Ni content is 0.857mg/L, the removal rate is 94%, and the maximum allowable discharge concentration of the first pollutant in Integrated wastewater discharge Standard (GB 8978-1996) is 1 mg/L.
Comparative example 2
Adding no magnetic powder in the grade 1 mixing, adding 120mg/L PAC coagulant, stirring, mixing and reacting for 30 min; the dosage of the 2-grade mixed PAM coagulant aid is 50mg/L, and other conditions are the same as those of the example 3. After treatment, the average COD content of the effluent is 65.714 mg/L, and the removal rate is 82%; the total phosphorus content is 40.227mg/L, and the removal rate is 85 percent; the Ni content is 0.986mg/L, and the maximum allowable discharge concentration of the first class of pollutants of Integrated wastewater discharge Standard (GB 8978-1996) is 1 mg/L.
Comparative example 3
No magnetic powder is added in the grade 1 mixing; the separation process does not adopt an air flotation process, adopts a precipitation process, and has the same other conditions as the example 3 and the other conditions as the example 4. After treatment, the average COD content of the effluent is 213.457mg/L, and the removal rate is 60%; the total phosphorus content is 102.412mg/L, and the removal rate is 65%; the Ni content is 2.336mg/L, which is higher than the highest allowable discharge concentration of 1mg/L of the first pollutant in Integrated wastewater discharge Standard (GB 2.336-1996), and secondary treatment is required until the standard is reached.
According to the results of the above examples and comparative examples, it can be seen that the treatment method of high-concentration phosphating wastewater of the invention can realize the treatment of high-concentration phosphating wastewater with only a small amount of magnetic powder, PAC and PAM, and has higher phosphorus removal rate compared with the traditional precipitation process.
Claims (5)
1. A treatment method of high-concentration phosphating wastewater comprises the following steps:
(1) adding a coagulant PAC and magnetic powder into the phosphating wastewater with the pH = 7-9, and stirring and mixing to obtain a primary mixing system;
(2) adding a coagulant aid PAM into the primary mixed system, and stirring and mixing to obtain a secondary mixed system;
(3) performing air floatation separation on the secondary mixed system by using an air floatation machine to obtain effluent and scum;
in the step (1), the adding amount of the PAC is 50-100mg/L, the polymerization degree m of the PAC is less than or equal to 10, the neutral degree n is 1-5, the adding amount of the magnetic powder is 10-20mg/L, and the average particle size of the magnetic powder is 400 meshes;
in the step (2), the ion degree of the PAM is 20-50%, the molecular weight is 800-1800 ten thousand, and the adding amount of the PAM is 20-30 mg/L.
2. The process according to claim 1, wherein in the step (1), the stirring and mixing time is 20 to 40 min.
3. The process of claim 1, wherein in the step (2), the stirring and mixing time is 20-40 min.
4. The utility model provides a processing system of high concentration bonderizing waste water, its characterized in that includes inlet tube, one-level mixing tank, second grade mixing tank, air supporting pond and outlet pipe in proper order, the one-level mixes the pond, loops through the pipeline intercommunication between second grade mixing tank and the air supporting pond, and waste water inserts the one-level mixing tank from the inlet tube, in the one-level mixing tank with coagulant PAC and magnetic force compulsory stirring form one-level mixing tank system, the one-level mixing system passes through conveyer pipe inflow second grade mixing tank, in the second grade mixing tank with coagulant aid PAM compulsory stirring form second grade mixing system, second grade mixing system passes through conveyer pipe inflow air supporting pond, the separation is dross and goes out water in the second grade mixing system air supporting pond, goes out water and meets out the air supporting pond through the outlet pipe.
5. The treatment system of claim 4, wherein the water inlet pipe is provided with an automatic pH control system for adjusting the pH of the inlet water, and the automatic pH control system comprises a monitor for monitoring the inlet water flow and the pH and a pipeline mixer for adjusting the pH of the inlet water; the water outlet pipe is provided with a Ni content monitor, a return pipe is arranged behind the Ni content monitor and communicated with the water inlet pipe, the return pipe is provided with a valve I, the water outlet pipe is also provided with a valve II, and the valves I and II are connected with the Ni content monitor.
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| CN102020373A (en) * | 2009-09-15 | 2011-04-20 | 上海宝钢工程技术有限公司 | Process for treating phosphate coating wastewater of steel pipes |
| CN104909490A (en) * | 2015-05-19 | 2015-09-16 | 东风活塞轴瓦有限公司 | Phosphating and chemical nickel-plating mixed comprehensive wastewater treatment process and automated device |
| CN108640401A (en) * | 2018-05-16 | 2018-10-12 | 内蒙古倍力肯环境资源有限公司 | A kind of novel quick magnetic-coagulation technique |
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| CN104909490A (en) * | 2015-05-19 | 2015-09-16 | 东风活塞轴瓦有限公司 | Phosphating and chemical nickel-plating mixed comprehensive wastewater treatment process and automated device |
| CN108640401A (en) * | 2018-05-16 | 2018-10-12 | 内蒙古倍力肯环境资源有限公司 | A kind of novel quick magnetic-coagulation technique |
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