CN211644966U - Reduce activated sludge reflux unit who discharges waste water COD value - Google Patents
Reduce activated sludge reflux unit who discharges waste water COD value Download PDFInfo
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- CN211644966U CN211644966U CN201922206309.7U CN201922206309U CN211644966U CN 211644966 U CN211644966 U CN 211644966U CN 201922206309 U CN201922206309 U CN 201922206309U CN 211644966 U CN211644966 U CN 211644966U
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Abstract
The utility model discloses an activated sludge reflux device for reducing COD value of discharged wastewater, which is arranged in an oily wastewater treatment system, wherein the oily wastewater treatment system comprises a primary sedimentation tank, the primary sedimentation tank is connected with a final sedimentation tank through a biological contact oxidation tank, the activated sludge reflux device comprises an activated sludge diversion trench, an activated sludge diversion trench and an activated sludge reflux pipeline which are sequentially communicated, the inlet of the activated sludge diversion trench is connected with the final sedimentation tank, and the outlet of the activated sludge reflux pipeline is connected with the biological contact oxidation tank for refluxing activated sludge into the biological contact oxidation tank; the utility model discloses simple structure, and the simple operation, the backward flow is with low costs.
Description
Technical Field
The utility model relates to a waste water treatment device in the field of steel plate manufacturing, in particular to an activated sludge reflux device for reducing the COD value of discharged waste water.
Background
In the process of manufacturing the steel plate, oily wastewater is inevitably generated, and in order to meet the local wastewater discharge standard, all steel plate production enterprises need to treat the oily wastewater and then discharge the oily wastewater. In order to meet the national regulations on wastewater discharge standards, the treatment is generally carried out through multiple processes, and the treatment means comprises chemical treatment means and physical treatment means. Particularly, oily waste water that is used for steel sheet production line output among the prior art all needs to be handled through the air supporting pond after handling through the flocculation vat usually, gets rid of most flocculates in the waste water through the air supporting pond and realizes the separation and purification of waste water, then further gets into subsequent biological contact oxidation pond and handles, carries out contact oxidation through with the outside air and realizes domesticating the metabolism, aim at effectively reducing the COD content in the waste water.
However, with the operation for a long time, the COD content of the wastewater obtained after the above multi-stage wastewater treatment process is still high, and the wastewater treatment devices of the air flotation tank and the biological contact oxidation tank also cause high treatment cost of the oily wastewater. Based on years of practical experience of the applicant in oily wastewater treatment and field observation and research, the applicant finds that the current oily wastewater process has great technical defects, and therefore, the technical problem is determined to be particularly researched, and a solution is hopefully found.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model aims at providing a reduce activated sludge reflux unit who discharges waste water COD value, simple structure, and the simple operation, the backward flow is with low costs.
The utility model adopts the technical scheme as follows:
the utility model provides a reduce activated sludge reflux unit who discharges waste water COD value installs in oily wastewater treatment system, oily wastewater treatment system is including just sinking the pond, just sink the pond and connect through biological contact oxidation pond and sink the pond eventually, activated sludge reflux unit is including the activated sludge guiding gutter, activated sludge reflux groove and the activated sludge backflow pipeline that communicate in proper order, the entry of activated sludge guiding gutter with sink the pond finally and connect, just activated sludge reflux pipeline's exit linkage biological contact oxidation pond for with activated sludge backward flow extremely in the biological contact oxidation pond.
Preferably, the activated sludge reflux tank comprises a primary activated sludge area and a fine activated sludge area which are separated by a partition plate, the installation height of the partition plate is smaller than the height of the primary activated sludge area, the primary activated sludge area is communicated with the final sedimentation tank, and an outlet of the fine activated sludge area is connected to the biological contact oxidation tank.
Preferably, the aperture range of the notch of the activated sludge diversion trench is 30-50 mm.
Preferably, the final sedimentation tank is provided with an activated sludge outlet, and the installation height of the activated sludge outlet is 1/3-2/3 of the installation height of the final sedimentation tank.
Preferably, the activated sludge diversion trench, the activated sludge return tank and the activated sludge return pipeline are all made of stainless steel.
Preferably, the biological contact oxidation tank comprises a biological contact oxidation tank body which is respectively provided with a filler and a microbial film, the biological contact oxidation tank body is connected with an aeration tank which is provided with an air blower, the aeration tank is connected with the primary sedimentation tank, meanwhile, the aeration tank is provided with an organic fertilizer feed inlet, and the final sedimentation tank reflows the activated sludge positioned on the surface layer into the aeration tank through the activated sludge reflowing device; wherein the outlet of the activated sludge return pipeline is connected with the aeration tank.
It should be noted that COD referred to in the present application is an abbreviation of English Chemical Oxygen Demand, and means Chemical Oxygen Demand, which is a known term in the field of wastewater treatment.
The main working idea of the oily wastewater treatment system provided by the utility model is to remove the air floatation tank connected with the flocculation tank and the biological contact oxidation tank between the air floatation tank and the primary sedimentation tank to stably reduce the COD content of the discharged wastewater, break the problem that the prior art needs to connect the air floatation tank for physical treatment after the flocculation tank exists, connect the air floatation tank with the primary biological contact oxidation tank through the air floatation tank, and then enter the wastewater treatment idea of the primary sedimentation tank through the primary biological contact oxidation tank, because the applicant surprisingly finds the treatment structure of the flocculation tank, the air floatation tank, the primary biological contact oxidation tank and the primary sedimentation tank, the COD content of the oily wastewater cannot be effectively reduced, after long-time use, the wastewater treated by the primary biological contact oxidation tank can not cultivate active sludge for a long time, the COD content of the wastewater can even increase, because the air floatation tank can remove most flocs in the oily wastewater to realize the effective separation and purification of the oily wastewater, after the oily wastewater after flocculation purification enters a primary biological contact oxidation pond, the domestication metabolic effect is extremely poor due to the lack of food of microorganisms; therefore, the utility model discloses creatively provide and get rid of the air supporting pond of being connected with the flocculation groove, and connect the one-level biological contact oxidation pond at air supporting pond and just heavy pond, directly be connected flocculation groove and just heavy pond, then only need just sink the pond and finally sink and be connected biological contact oxidation pond between the pond, can effectively reduce the COD content of oily waste water, simultaneously because having got rid of prior art's air supporting pond and one-level biological contact oxidation pond, the treatment cost of oily waste water has been showing and reduced, and still can improve the treatment effeciency of oily waste water, the dwell treatment time of oily waste water in one-level biological contact oxidation pond has been saved.
The utility model provides an operating principle that oily waste water treatment process adopted is on the oily waste water treatment system technical scheme basis that the adoption has got rid of air supporting pond and one-level biological contact oxidation pond, further proposes the activated sludge who will sink the pond to flow back to in the biological contact oxidation pond for increase the activated sludge volume in biological contact oxidation pond, with higher speed the metabolism of microorganism reduces the COD value of oily waste water in the biological contact oxidation pond, through actual detection, through the utility model discloses an oily waste water treatment process handles the waste water COD content that obtains and can realize at 30mg/L and below, reaches one-level emission standard, and the waste water that adopts traditional oily waste water treatment process can only be controlled within 200 mg/L.
The utility model discloses still further provide preferred activated sludge reflux unit structure, concrete structure is including the activated sludge guiding gutter that communicates in proper order, activated sludge return-flow tank and activated sludge return-flow line, wherein, the activated sludge guiding gutter can in time be with the quick water conservancy diversion of activated sludge who is in the flow state in the final sedimentation tank to the activated sludge return-flow tank in, then the simple settlement separation of activated sludge return-flow tank, finally flow back to the biological contact oxidation pond through activated sludge return-flow line in, moreover, the steam generator is simple in structure, and the simple operation, the backward flow is with low costs.
Drawings
FIG. 1 is a schematic view of the structural connection of an oily wastewater treatment system according to an embodiment of the present invention;
FIG. 2 is a block diagram of the operation steps of the oily wastewater treatment process according to the embodiment of the present invention;
fig. 3 is a schematic structural connection diagram of the activated sludge recirculation apparatus according to the embodiment of the present invention.
Detailed Description
The embodiment of the utility model discloses active sludge reflux unit that can be used to reduce emission waste water COD value installs in oily wastewater treatment system, oily wastewater treatment system is including just sinking the pond, just sink the pond and connect through biological contact oxidation pond and sink the pond eventually, active sludge reflux unit is including the activated sludge guiding gutter that communicates in proper order, activated sludge return-flow tank and active sludge backflow pipeline, the entry and the terminal pond of activated sludge guiding gutter are connected, and the exit linkage biological contact oxidation pond of active sludge backflow pipeline for with active sludge backward flow to the biological contact oxidation pond in.
In order to make the technical solutions in the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.
Referring to fig. 1, an oily wastewater treatment system 100 is shown, which is connected between an oily wastewater outlet 200 of a steel plate production line and a municipal industrial wastewater discharge pipeline 300, the oily wastewater treatment system 100 includes an oil separation tank 10 for separating suspended oil, and the suspended oil in the oily wastewater is transferred to a wastewater tank 20 through the oil separation tank 10, preferably, in the present embodiment, the wastewater tank 20 is provided with an oil-water separation device (not shown, specifically, a filtering membrane may be used), a waste oil water outlet 21 of the oil-water separation device is connected with the oil separation tank 10 in a backflow manner, and a suspended oil outlet 22 of the oil-water separation device is transported outside by an oil floating vehicle 23;
in the embodiment, the oil separating groove 10 is connected with an oily wastewater adjusting tank 30, and the oily wastewater adjusting tank 30 is simultaneously connected with a domestic sewage outlet 31 and a rainwater well 32; the oily wastewater adjusting tank 30 is sequentially connected with a demulsification tank 40 and a flocculation tank 50, wherein the flocculation tank 50 is connected with a primary sedimentation tank 70, preferably, in the embodiment, a neutralization barrel 60 for adjusting the pH value of the oily wastewater is arranged between the flocculation tank 50 and the primary sedimentation tank 70, and the pH value range of the oily wastewater is kept between 6 and 9 through the neutralization barrel 60;
in the present embodiment, the primary sedimentation tank 70 is connected to the final sedimentation tank 90 through the biological contact oxidation tank 80, and preferably, in the present embodiment, a buffer tank 91 for adjusting the drainage rate of the oily wastewater is provided between the primary sedimentation tank 70 and the biological contact oxidation tank 80; the final sedimentation tank 90 is connected with a municipal industrial wastewater discharge pipeline 300 after being treated by an activated carbon adsorption tower 92;
preferably, in the present embodiment, the emulsion breaking tank 40 is communicated with the emulsion breaker feeding source 41, and the emulsion breaking tank 40 is provided with a first electric stirrer (not shown), so that when the oil-containing wastewater is subjected to emulsion breaking operation, the oil-containing wastewater and the emulsion breaker in the emulsion breaking tank 40 are stirred and mixed by the first electric stirrer, so as to ensure the emulsion breaking effect on the oil-containing wastewater; the flocculation tank 50 is connected with a flocculant feeding source, and the flocculation tank 50 is provided with a second electric stirrer (not shown), so that when the oily wastewater is flocculated, the oily wastewater and the flocculant in the flocculation tank 50 are stirred and mixed by the second electric stirrer to ensure the flocculation effect on the oily wastewater; the demulsifier and the flocculant used in the present embodiment may be known demulsifiers and flocculants, for example, the flocculant may be polyacryl;
preferably, the biological contact oxidation tank 80 comprises a biological contact oxidation tank body 81 in which a filler and a microbial film are arranged, the biological contact oxidation tank body 81 is connected with an aeration tank 82 provided with a blower, the aeration tank 82 is connected with a buffer tank 91, and meanwhile, the aeration tank 82 is provided with an organic fertilizer feed inlet 82a, and the organic fertilizer specifically comprises a nitrogenous fertilizer and a phosphate fertilizer; an activated sludge reflux device 400 is arranged between the aeration tank 81 and the final sedimentation tank 90, the activated sludge reflux device 400 comprises an activated sludge diversion trench 410, an activated sludge reflux trench 420 and an activated sludge reflux pipeline 430 which are sequentially communicated, the inlet of the activated sludge diversion trench 410 is connected with the final sedimentation tank 90, and the outlet of the activated sludge reflux pipeline 430 is connected with the aeration tank 82 and is used for refluxing activated sludge into the aeration tank 82;
preferably, in the present embodiment, the bottom outlet of the deposited sludge of the primary sedimentation tank 70 and the bottom outlet of the deposited sludge of the final sedimentation tank 90 are respectively connected to an oil concentration tank 93, the oil concentration tank 93 is connected to a pressure sludge tank equipped with a filter press 94, the filtrate outlet 94a of the filter press 94 is connected to the oily wastewater conditioning tank 30, and the filter press sludge outlet 94b of the filter press 94 is transported out by a sludge truck 95 for treatment; further preferably, in the present embodiment, the primary sedimentation tank 70 and the final sedimentation tank 90 are respectively provided with a sludge discharge motor driving assembly (not shown), and the deposited sludge bottom outlet of the primary sedimentation tank 70 and the deposited sludge bottom outlet of the final sedimentation tank 90 are respectively connected with the oil concentration tank 93 through sludge discharge pipes.
The main working idea of the oily wastewater treatment system 100 provided in this embodiment is to remove the air flotation tank connected to the flocculation tank and the biological contact oxidation tank located between the air flotation tank and the primary sedimentation tank to stably reduce the COD content of the discharged wastewater, and break through the wastewater treatment idea that in the prior art, the air flotation tank needs to be connected for physical treatment after the flocculation tank is present, the air flotation tank is connected with the primary biological contact oxidation tank, the wastewater passes through the primary biological contact oxidation tank and then enters the primary sedimentation tank, because the applicant has discovered, quite surprisingly, that the COD content of the oily wastewater cannot be effectively reduced by adopting the treatment structures of the flocculation tank, the air flotation tank, the primary biological contact oxidation tank and the primary sedimentation tank, after long-term use, the wastewater treated by the primary biological contact oxidation tank cannot be cultured with active sludge for a long time, the COD content of the wastewater even increases, and because the air flotation tank can remove most flocs in the oily wastewater, effective separation and purification of the oily wastewater is realized, after the oily wastewater after flocculation purification enters a primary biological contact oxidation pond, the domestication metabolic effect is extremely poor due to the lack of food of microorganisms; therefore, the present embodiment creatively proposes to remove the air flotation tank connected to the flocculation tank and the primary bio-contact oxidation tank connected to the air flotation tank and the primary sedimentation tank, directly connect the flocculation tank 50 to the primary sedimentation tank 70, and then only need to connect the bio-contact oxidation tank 80 between the primary sedimentation tank 70 and the final sedimentation tank 90, which can effectively reduce the COD content of the oily wastewater, and meanwhile, because the air flotation tank and the primary bio-contact oxidation tank in the prior art are removed, the treatment cost of the oily wastewater is significantly reduced, and the treatment efficiency of the oily wastewater can be improved, and the retention treatment time of the oily wastewater in the primary bio-contact oxidation tank is saved;
referring to fig. 2, the present embodiment further provides an oily wastewater treatment process, in which the oily wastewater treatment system 100 of the present embodiment is used for treating oily wastewater of a steel plate production line, and the operation steps of the oily wastewater treatment process include:
s110), firstly, transferring the suspended oil in the oily wastewater into a wastewater tank 20 through an oil separating tank 10, discharging the oily wastewater treated by the oil separating tank 10 into an oily wastewater adjusting tank 30, and guiding domestic sewage and rainwater into the oily wastewater adjusting tank 30 to adjust the water quality and the water quantity of the oily wastewater; meanwhile, the waste oil tank 20 is periodically transported outside for treatment by the floating oil vehicle 23, and the residual waste oil water flows back to the oil separation tank 10;
s120), carrying out emulsion breaking treatment and flocculation treatment on the oily wastewater regulated by the oily wastewater regulating tank 30 in sequence, and then discharging the oily wastewater into a primary sedimentation tank 70; preferably, in the step S120), the oily wastewater after the flocculation treatment is discharged to the primary sedimentation tank 70 after being subjected to pH neutralization adjustment in advance, wherein the pH neutralization adjustment keeps the pH range of the oily wastewater after the flocculation treatment at 6-9; preferably, the neutralizing agent used for pH neutralization adjustment comprises NaOH alkaline solution and H2SO4An acid solution;
s130), carrying out primary precipitation separation on the oily wastewater by using the primary precipitation tank 70, and guiding the oily wastewater subjected to the primary precipitation separation treatment into the biological contact oxidation tank 80 for microorganism domestication metabolic treatment so as to reduce the COD content of the oily wastewater; preferably, in the step S130), the drainage speed is buffer-regulated by the buffer tank 91 during the drainage process of the oily wastewater after the primary precipitation separation treatment to the biological contact oxidation pond 80;
s140), draining the oily wastewater subjected to the microbial domestication and metabolism treatment into a final sedimentation tank 90, and performing final sedimentation and separation treatment on the oily wastewater by the final sedimentation tank 90 to obtain treated water;
s150), performing waste gas and deodorization adsorption treatment on the treated water by an activated carbon adsorption tower 92, and then discharging the treated water to a municipal industrial wastewater discharge pipeline 300;
s160), transferring the deposited sludge in the primary sedimentation tank 70 and the final sedimentation tank 90 to an oil concentration tank 93 according to a preset transfer period, carrying out filter pressing treatment on the deposited sludge to respectively obtain filtrate and filter-pressed sludge, refluxing the filtrate to an oily wastewater adjusting tank 30, and transporting the filter-pressed sludge outside through a sludge truck 95.
Wherein, the oily wastewater treatment process in this embodiment further comprises: the activated sludge in the final sedimentation tank 90 is returned to the aeration tank 82 for increasing the amount of the activated sludge in the biological contact oxidation tank 81, accelerating the metabolism of microorganisms in the biological contact oxidation tank 81 and reducing the COD value of the oily wastewater; through practical detection, the COD content of the wastewater obtained by the treatment process of the oily wastewater can be realized at 30mg/L or below, and the first-level discharge standard is reached.
Referring to fig. 3, the present embodiment further preferably provides an activated sludge recirculation apparatus 400 for reducing the COD value of the discharged wastewater, which is installed in the oily wastewater treatment system 100, wherein the activated sludge recirculation apparatus 400 includes an activated sludge diversion trench 410, an activated sludge recirculation trench 420, and an activated sludge recirculation pipeline 430, which are sequentially connected, and the activated sludge diversion trench 410, the activated sludge recirculation trench 420, and the activated sludge recirculation pipeline 430 are made of stainless steel; the inlet of the activated sludge diversion trench 410 is connected with the final sedimentation tank 90, and the outlet of the activated sludge return pipeline 430 is connected with the aeration tank 82 and is used for returning the activated sludge to the aeration tank 82 of the biological contact oxidation tank 80;
preferably, in the present embodiment, the aperture of the activated sludge guiding gutter 410 is in the range of 30-50 mm; preferably, in the present embodiment, the activated sludge recirculation tank 420 is provided with a primary activated sludge area 422 and a fine activated sludge area 423 which are arranged on a partition plate 421, the installation height of the partition plate 421 is smaller than the height of the primary activated sludge area 422, the primary activated sludge area 422 is communicated with the final sedimentation tank 90, and the outlet of the fine activated sludge area 423 is connected to the aeration tank 82 of the biological contact oxidation tank 80;
preferably, in the present embodiment, the final sedimentation tank 90 is provided with an activated sludge outlet 90a, and the installation height of the activated sludge outlet 90a is 1/3-2/3 of the installation height of the final sedimentation tank 90, so as to ensure smooth diversion of activated sludge, avoid diversion of low-activity deposited sludge located below, and easily block the activated sludge outlet 90a due to low activity and poor fluidity.
The activated sludge reflux unit 400 that this embodiment provided simple structure, and the simple operation, the backward flow is with low costs.
It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (6)
1. The utility model provides a reduce activated sludge reflux unit who discharges waste water COD value installs in oily wastewater treatment system, oily wastewater treatment system is including just sinking the pond, just sink the pond and connect the pond that sinks eventually through biological contact oxidation pond, a serial communication port, activated sludge reflux unit is including the activated sludge guiding gutter, activated sludge return chute and the activated sludge return line that communicate in proper order, the entry of activated sludge guiding gutter with sink the pond and connect eventually, just activated sludge return line's exit linkage biological contact oxidation pond for with activated sludge backward flow extremely in the biological contact oxidation pond.
2. The activated sludge backflow device for reducing the COD value of discharged wastewater according to claim 1, wherein the activated sludge backflow tank comprises a primary activated sludge area and a fine activated sludge area which are separated by a partition plate, the installation height of the partition plate is smaller than the height of the primary activated sludge area, the primary activated sludge area is communicated with the final sedimentation tank, and the outlet of the fine activated sludge area is connected into the biological contact oxidation tank.
3. The activated sludge recirculation apparatus for reducing the COD value of the discharged wastewater according to claim 1, wherein the aperture of the opening of the activated sludge diversion trench is in the range of 30-50 mm.
4. The activated sludge recirculation apparatus for reducing the COD value of the discharged wastewater according to claim 1, wherein the final sedimentation tank is provided with an activated sludge outlet, and the installation height of the activated sludge outlet is 1/3-2/3 of the installation height of the final sedimentation tank.
5. The activated sludge backflow device for reducing the COD value of discharged wastewater according to claim 1, wherein the activated sludge diversion trench, the activated sludge backflow trench and the activated sludge backflow pipeline are all made of stainless steel.
6. The activated sludge reflux apparatus for reducing the COD value of discharged wastewater according to claim 1, wherein the biological contact oxidation tank comprises a biological contact oxidation tank body provided with a filler and a microbial film, respectively, the biological contact oxidation tank body is connected with an aeration tank provided with a blower, the aeration tank is connected with the primary sedimentation tank, the aeration tank is provided with an organic fertilizer feed inlet, and the final sedimentation tank refluxes activated sludge on the surface layer into the aeration tank through the activated sludge reflux apparatus; wherein the outlet of the activated sludge return pipeline is connected with the aeration tank.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113651417A (en) * | 2021-08-27 | 2021-11-16 | 艾萍 | Sewage treatment system and method for environmental engineering |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113651417A (en) * | 2021-08-27 | 2021-11-16 | 艾萍 | Sewage treatment system and method for environmental engineering |
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