CN211471140U - Wastewater treatment device for PVB resin production - Google Patents
Wastewater treatment device for PVB resin production Download PDFInfo
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- CN211471140U CN211471140U CN201921589491.2U CN201921589491U CN211471140U CN 211471140 U CN211471140 U CN 211471140U CN 201921589491 U CN201921589491 U CN 201921589491U CN 211471140 U CN211471140 U CN 211471140U
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Abstract
The invention discloses a wastewater treatment device for PVB resin production, which comprises an electrolytic cell, wherein a wastewater inlet pipe is arranged at the lower part of the electrolytic cell, an iron-carbon inner electrolytic zone and a polar plate outer electrolytic zone are sequentially arranged in the middle of the electrolytic cell from bottom to top, an overflow port and a waste gas pipe are arranged at the upper part of the electrolytic cell, the waste gas pipe is connected with a washing and collecting tower, a washing zone is arranged at the lower part of the absorption and washing tower, a drying zone and an adsorption zone are sequentially arranged at the upper part of the absorption and washing tower, an air inlet pipe is arranged on the tower wall at the middle-lower part of the absorption and washing tower, an air outlet is arranged on the tower wall at the top of. The utility model discloses with tail gas through washing and absorption treatment, can get rid of chlorine, butyraldehyde and hydrogen chloride in the tail gas, purifying effect is good, and the gas after the processing reaches atmospheric emission standard, the utility model discloses not only can carry out the preliminary treatment to sewage, can clear up the waste gas of liberating in the sewage moreover, avoid secondary pollution.
Description
Technical Field
The utility model relates to a wastewater treatment device especially relates to a wastewater treatment device of PVB resin production.
Background
At present, mother liquor wastewater obtained after the preparation of the PVB resin contains substances such as n-butyl aldehyde, polyvinyl butyral, polyvinyl alcohol, hydrochloric acid and the like. The complex mother liquor contains organic matters and inorganic matters, the organic matters are divided into low molecular compounds and high molecular compounds, the water quality and the components are complex, the wastewater system cannot be directly discharged, the wastewater is difficult to treat by a biological method or a physical and chemical method to reach the standard, the treatment cost is high, and the popularization is difficult.
However, the existing sewage treatment has no pretreatment process to remove the waste gas in the sewage, or has a pretreatment device to directly discharge the waste gas into the atmosphere, so that not only the sewage treatment efficiency is low, but also the waste gas contains chlorine, butyraldehyde, hydrogen chloride and air mixed gas, which inevitably causes secondary pollution to the atmospheric environment.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a PVB waste water treatment plant in order to solve above-mentioned problem, can reduce the waste of resource, avoid the environment to receive the pollution simultaneously.
The utility model discloses a following technical scheme realizes above-mentioned purpose:
waste water treatment device of PVB resin production includes the electrolytic bath, the lower part of electrolytic bath is equipped with the waste water inlet tube, electrolysis district and the outer electrolysis district of polar plate in the middle part in the electrolytic bath from bottom to top are equipped with in proper order, be equipped with the iron carbon filler of constituteing by iron fillings and carbon granules in the electrolysis district in the iron carbon, be equipped with a plurality of electrode polar plates of horizontal direction interval arrangement in the outer electrolysis district of polar plate, the upper portion of electrolytic bath is equipped with the overflow mouth, the overflow mouth is connected with the inner of waste water outlet pipe.
In order to make the wastewater distributed more uniformly in the electrolysis area, a water distributor and an aerator are arranged at the lower part in the electrolysis tank, the inlet of the water distributor is connected with the wastewater inlet pipe, the outlet of the water distributor faces upwards, an air inlet pipe is also arranged at the lower part of the electrolysis tank, the inlet of the aerator is connected with the air inlet pipe, and the outlet of the aerator faces upwards; the aerator is positioned below the water distributor; the top of the electrolytic tank is provided with a gas collecting hood, the top of the gas collecting hood is provided with an air suction port, an absorption washing tower is arranged beside the electrolytic tank, the side surface of the absorption washing tower is provided with an air inlet, the air suction port is connected with a negative pressure pump through an air suction pipeline, an air outlet of the negative pressure pump is connected with a one-way valve through an air outlet pipeline, and the one-way valve is connected with the air inlet; in addition, a plurality of transverse partition plates are detachably arranged in the air suction pipeline, mounting holes are formed in the transverse partition plates, adsorption resin is arranged in the mounting holes, the interior of the adsorption resin is of an crosslinked network structure, and the adsorption resin is a polymer bead-shaped body, has a large specific surface area and an excellent hole structure, can remove organic matters in waste gas, has good reproducibility, and can be repeatedly adsorbed, eluted, re-adsorbed, re-eluted and recycled.
The lower part in the absorption scrubbing tower is a washing area, NaOH solution with the concentration of more than 5% is filled in the washing area, a drying area and an adsorption area are sequentially arranged on the upper part in the absorption scrubbing tower, a silica gel drying agent is filled in the drying area, an activated carbon adsorbent is filled in the adsorption area, an air inlet pipe is arranged on the tower wall of the middle lower part of the absorption scrubbing tower, and an air outlet is arranged on the tower wall of the top of the absorption scrubbing tower.
The waste gas firstly passes through a washing area, under the action of a washing liquid, namely NaOH solution, chlorine and hydrogen chloride gas are washed, tail gas continuously rises to pass through a drying area, water vapor in a gas phase is removed, then the tail gas enters an adsorption area, butyraldehyde molecules are adsorbed, and finally the waste gas is discharged to the atmosphere.
Preferably, the NaOH solution is a saturated solution.
PVB waste water treatment device, including the wastewater disposal basin that connects gradually, add medicine pond, first inclined plate sedimentation tank, first biological contact oxidation pond, the biological contact oxidation pond of second, second inclined plate sedimentation tank and reuse pond, still include above-mentioned wastewater treatment device, wastewater treatment device's entry with the exit linkage of wastewater disposal basin, wastewater treatment device's export with add the entry linkage in medicine pond.
Wastewater treatment process of a PVB production wastewater treatment device, comprising the following steps:
(1) iron-carbon electrolysis: the wastewater stays in the wastewater treatment device for 2-4 hours, and the aeration rate of an aerator arranged at the lower part in the electrolytic cell is 3-5 m3The volume ratio of iron filings and carbon particles of the iron-carbon filler in the iron-carbon internal electrolysis region is 1:1, and the positive pole and the negative pole of a direct current power supply externally connected with a plurality of electrode plates in the electrode plate external electrolysis region are switched once per hour;
(2) adding a medicine for reaction: adding a sodium hydroxide solution with the concentration of 5% and a PAM solution with the concentration of 1% into a dosing tank, and arranging an aerator at the bottom of the dosing tank to uniformly mix the two solutions; adjusting the pH value of the wastewater in the dosing tank to 7-8 by using a sodium hydroxide solution, wherein the added PAM solution is 0.5-1 per mill of the volume of the wastewater in the dosing tank;
(3) first precipitation;
(4) first oxidation reaction: in a first biological contact oxidation pond, the concentration of dissolved oxygen is 3mg/L, the pH of a solution is 7-8, and the retention time is 10-20 hours;
(5) and (3) second oxidation reaction: in a second biological contact oxidation pond, the concentration of dissolved oxygen is 3mg/L, the pH of the solution is 7-8, and the retention time is 10-20 hours;
(6) and (5) precipitating for the second time, and allowing clear water to enter a reuse water tank to finish wastewater treatment.
Specifically, in the step (1), the wastewater stays in the wastewater treatment device for 2, 2.5 or 4 hours, and the aeration amount of an aerator arranged at the lower part in the electrolytic cell is 3, 4 or 5m 3/h; in the step (2), the added PAM solution is 0.5 per mill, 0.8 per mill or 1 per mill of the volume of the wastewater in the dosing tank; in the step (4) and the step (5), the residence time is 10, 12.5 or 20 hours.
The beneficial effects of the utility model reside in that:
the wastewater treatment device integrates the iron-carbon internal electrolysis area and the polar plate external electrolysis area into the electrolytic cell, so that two electrolysis reactions of iron-carbon internal electrolysis and polar plate external electrolysis are realized in the electrolytic cell by wastewater, COD is obviously reduced, and the wastewater treatment effect is obviously improved; meanwhile, the aerator is integrated at the bottom of the electrolytic bath, so that the waste water, the scrap iron and the carbon granules are mixed more uniformly, the purification effect is better, the retention time of the waste water in the electrolytic bath is obviously reduced, and the waste water treatment efficiency is improved.
PVB waste water treatment plant utilizes waste water acid characteristics, adopts the little electrolysis of iron carbon + process of carrying out biochemical contact oxidation again after the external electrolysis, makes the play water reach the retrieval and utilization standard, and the consumption of sodium hydroxide is little to solved the problem that reverse osmosis membrane became invalid soon, regeneration frequency is high.
The utility model can remove chlorine, butyraldehyde and hydrogen chloride in the tail gas through washing and absorption (namely adsorption) treatment of the tail gas, has good purification effect, ensures that the treated gas reaches the atmospheric emission standard and is completed in the washing absorption tower in a centralized way, and has simple and compact structure, small occupied space and low operation cost; in addition, the silica gel desiccant and the activated carbon adsorbent are combined for use, so that the regeneration and the replacement are convenient, and the operation is convenient.
Drawings
FIG. 1 is a schematic structural view of a wastewater treatment apparatus for PVB resin production according to the present invention, showing the internal structure of an electrolytic cell;
the specific implementation mode is as follows:
the present invention will be further explained with reference to the accompanying drawings:
as shown in fig. 1, the PVB waste water electrolysis tail gas treatment device of the present invention comprises an electrolytic tank 7, a waste water inlet pipe 1 and an air inlet pipe 2 are arranged at the lower part of the electrolytic tank 7, the waste water inlet pipe 1 is positioned above the air inlet pipe 2, a water distributor 5 and an aerator 4 are arranged at the lower part in the electrolytic tank 7, the aerator 4 is positioned below the water distributor 5, the inlet of the water distributor 5 is connected with the waste water inlet pipe 1, the inlet of the aerator 4 is connected with the air inlet pipe 2, and the outlet of the water distributor and the outlet of the aerator 4 are both upward; an iron-carbon inner electrolytic area 6 and an electrode plate outer electrolytic area are sequentially arranged in the middle of the electrolytic cell 7 from bottom to top, iron-carbon fillers (not marked in the figure) consisting of scrap iron and carbon particles are filled in the iron-carbon inner electrolytic area 6, a plurality of electrode plates 8 which are arranged at intervals in the horizontal direction are arranged in the electrode plate outer electrolytic area, two adjacent electrode plates 8 are respectively externally connected with the positive electrode and the negative electrode of the direct-current power supply 3, an overflow port (not marked in the figure) is arranged at the upper part of the electrolytic cell 7, and the overflow port is connected with the inner end of a wastewater outlet pipe 9; gas collecting channel 10 is installed at the top of electrolytic cell 7, and induction port 11 is seted up at the top of gas collecting channel 10, electrolytic cell body 7 is other to be set up and to absorb scrubbing tower 12, absorption scrubbing tower 12 side sets up air inlet 13, induction port 11 connects negative pressure pump 15 through intake duct 14, negative pressure pump 15's gas outlet through outlet duct 16 connect check valve 17 with air inlet 13 is connected, the detachable a plurality of cross slab 18 that sets up in the intake duct 14.
The lower part in the absorption washing tower 12 is a washing area 19, the washing area 13 is filled with NaOH saturated solution, the upper part in the absorption washing tower 12 is sequentially provided with a drying area 20 and an adsorption area 21, the drying area 20 is filled with silica gel desiccant, the adsorption area 20 is filled with activated carbon adsorbent, and the tower wall at the top of the absorption washing tower 12 is provided with an air outlet (not marked in the figure).
As shown in figure 1, when the wastewater treatment device for PVB resin production operates, acidic organic wastewater enters the electrolytic cell 7 from the wastewater inlet pipe 1 at the lower part of the electrolytic cell 7 and uniformly flows out through the water distributor 5, air sent by the Roots blower enters the electrolytic cell 7 through the air inlet pipe 2 and is sent out through the aerator 4, and the air sent by the aerator 4 rises in the wastewater, so that the wastewater treatment device has the effects of providing oxygen, preventing scrap iron from hardening, enabling the wastewater to be stirred uniformly and reducing the retention time of the wastewater in the electrolytic cell 7.
After being mixed with air, the wastewater firstly passes through the iron-carbon filler in the iron-carbon internal electrolysis zone 6, and in the acid environment, countless micro galvanic cells are formed between the scrap iron and the carbon particles, so that macromolecular organic matters in the wastewater are decomposed, and further COD is reduced; the wastewater continues to rise to the electrolytic zone outside the electrode plate, and the electrode plate 8 reacts in the wastewater as follows: the anode reaction is as follows: 2Cl--2e→Cl2The cathode reacts as follows: fe2++2e → Fe, when the cathode has more Fe attached, the current decreases, the positive and negative poles of the DC power supply 3 are exchanged, and Fe attached to the electrode plate 8 loses electrons and becomes Fe2+. The COD of the waste water after the iron-carbon internal electrolysis and the polar plate external electrolysis is obviously reduced, and the waste water overflows from the overflow port and is sent to a rear working section by a waste water outlet pipe 9 for further biochemical treatment. Generated Cl2And the aeration air is discharged from the top of the gas collecting hood 10 and sent to an absorption washing tower 12 by an air suction pipeline 14 to be washed and then discharged to the atmosphere.
After entering the absorption washing tower 12 from the gas suction pipeline 14, the waste gas firstly passes through the washing zone 12, and the chlorine and the hydrogen chloride gas in the tail gas are washed by the NaOH saturated solution; the tail gas continues to rise through the drying zone 20, and the silica gel desiccant in the drying zone 20 removes water vapor in the gas phase; the tail gas enters the adsorption zone again, the active carbon adsorbent in the adsorption zone 21 adsorbs butyraldehyde molecules in the tail gas, and finally, only the tail gas with most air is left to be discharged to the atmosphere.
The above-mentioned embodiment is only the preferred embodiment of the present invention, and is not to the limitation of the technical solution of the present invention, as long as the technical solution can be realized on the basis of the above-mentioned embodiment without creative work, all should be regarded as falling into the protection scope of the right of the present invention.
Claims (5)
1. The utility model provides a wastewater treatment device of PVB resin production which characterized in that: the electrolytic tank comprises an electrolytic tank, wherein a wastewater inlet pipe is arranged at the lower part of the electrolytic tank, an iron-carbon internal electrolytic area and a polar plate external electrolytic area are sequentially arranged in the middle of the electrolytic tank from bottom to top, iron-carbon filler consisting of scrap iron and carbon particles is filled in the iron-carbon internal electrolytic area, a plurality of electrode polar plates which are arranged at intervals in the horizontal direction are arranged in the polar plate external electrolytic area, two adjacent electrode polar plates are respectively externally connected with a positive electrode and a negative electrode of a direct-current power supply, an overflow port is arranged at the side part of the electrolytic tank, and the overflow port is connected with the inner end of a wastewater outlet pipe;
still include the absorption scrubbing tower, the lower part in the absorption scrubbing tower is the washing district, the NaOH solution that the concentration is more than 5% is equipped with in the washing district, upper portion in the absorption scrubbing tower is equipped with drying zone and adsorption zone in proper order, the silica gel drier is equipped with in the drying zone, the activated carbon adsorbent is equipped with in the adsorption zone, be equipped with the intake pipe on the tower wall of the well lower part of absorption scrubbing tower, be equipped with the gas outlet on the tower wall of the top of absorption scrubbing tower.
2. The apparatus for treating waste water produced by PVB resin of claim 1, wherein: and the top of the electrolytic cell is provided with a gas-collecting hood, and the top of the gas-collecting hood is provided with a gas suction pipeline connected with the absorption washing tower.
3. The apparatus for treating waste water produced by PVB resin of claim 1, wherein: the lower part of the electrolytic cell is provided with a water distributor and an aerator, the inlet of the water distributor is connected with the wastewater inlet pipe, the outlet of the water distributor is upward, the lower part of the electrolytic cell is also provided with an air inlet pipe, the inlet of the aerator is connected with the air inlet pipe, and the outlet of the aerator is upward; the aerator is located below the water distributor.
4. The apparatus for treating waste water produced by PVB resin of claim 3, wherein: the air suction port is formed in the top of the cover body and is connected with the negative pressure pump through the air suction pipeline, the air outlet of the negative pressure pump is connected with the one-way valve through the air outlet pipeline, the one-way valve is connected with the air inlet, a plurality of transverse partition plates are detachably arranged in the air suction pipeline, mounting holes are formed in the transverse partition plates, and adsorption resin is arranged in the mounting holes.
5. The utility model provides a wastewater treatment device of PVB resin production, includes the wastewater disposal basin that connects gradually, adds the medicine pond, first inclined plate sedimentation tank, first biological contact oxidation pond, the biological contact oxidation pond of second, second inclined plate sedimentation tank and reuse pond, its characterized in that: the wastewater treatment plant of claim 1, 2 or 4 further comprising an inlet of the wastewater treatment plant connected to an outlet of the wastewater basin and an outlet of the wastewater treatment plant connected to an inlet of the dosing basin.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921589491.2U CN211471140U (en) | 2019-09-23 | 2019-09-23 | Wastewater treatment device for PVB resin production |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921589491.2U CN211471140U (en) | 2019-09-23 | 2019-09-23 | Wastewater treatment device for PVB resin production |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115159626A (en) * | 2022-07-18 | 2022-10-11 | 华能应城热电有限责任公司 | Electrochemical descaling and dechlorinating system and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115159626A (en) * | 2022-07-18 | 2022-10-11 | 华能应城热电有限责任公司 | Electrochemical descaling and dechlorinating system and method |
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