CN103351054A - BAF reactor used for treating electroplating wastewater - Google Patents
BAF reactor used for treating electroplating wastewater Download PDFInfo
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- CN103351054A CN103351054A CN2013102756733A CN201310275673A CN103351054A CN 103351054 A CN103351054 A CN 103351054A CN 2013102756733 A CN2013102756733 A CN 2013102756733A CN 201310275673 A CN201310275673 A CN 201310275673A CN 103351054 A CN103351054 A CN 103351054A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention provides a BAF reactor used for treating electroplating wastewater, which belongs to the field of environment engineering technology. The BAF reactor overcomes technical problems like a low removal rate of pollutants in a conventional electroplating wastewater reactor. The BAF reactor used for treating electroplating wastewater comprises a reaction tank. The reaction tank is segmented into a reaction chamber I and a reaction chamber II by a separator plate. A filter layer I using rigid foamed plastic as a filling material is arranged in the reaction chamber I. A filter layer II using spherical lightweight biological ceramsite as a filling material is arranged in the reaction chamber II. The reactor further comprises a water inflowing tank and a water outflowing tank respectively communicated with the reaction chamber I and the reaction chamber II. The reaction chamber II is connected with an oxygen-supplying aeration tank. The separator plate is provided with a water-passing hole which allows the reaction chamber I to be communicated with the reaction chamber II. The BAF reactor provided by the invention has the advantages of a high removal rate, easy and effective operation, etc.
Description
Technical field
The invention belongs to field of environment engineering technology, relate to a kind of BAF reactor for the treatment of electroplating wastewater.
Background technology
BAF full name Biological Aerated Filter, it is BAF, be a kind of the aerobic of granule filter material fixed biofilm or anoxic bio-reactor of adopting, this technique integrates bio-contact oxidation and suspended substance filter bed retention functions, is the New Technology about Wastewater Treatment that rises in the world.
Plating is less requisite fundamental technology industry in the national economy, is again heavy polluted industry simultaneously.In recent years, China's electroplating enterprise quantity growth is rapid, and the electroplating industry annual value of production has been crossed 10,000,000,000 Renminbi, and electroplating industry suddenly becomes the important processing industry of China, but the sewage that produces in the electroplating process also highlights gradually to the harm of environment.The sewage discharge of electroplating process mainly is that the discharging by washing water causes, and the principal pollutant in the washing water are pH, CODcr, heavy metal ion and oils.
The method that both at home and abroad improvement of electroplating wastewater is generally adopted at present comprises: method of chemical treatment, electrolytic process, ion exchange treatment method, membrane separation technique, ion floatation method, active carbon adsorption and biological process etc.Biological aerated filter process (BAF) has become study hotspot both domestic and external in recent years as a kind of efficient, energy-conservation, Novel sewage treatment technology that floor space is little.Filler is the important component part of BAF, and the change of filler is far-reaching to the influence on development of BAF technique.Development course by filler can be found out, from initial natural sandstone to high-tech products such as present spherical biological haydite, enzyme-catalyzed packings, its trend is exactly the nature influence factor that weakens gradually, and the strengthened artificial control process makes filler constantly satisfy in advance designed good requirement of people.But it is still quite big that a kind of filler satisfies the multiple difficulty that requires simultaneously, thereby the multilayer of multiple filler combination or multistage BAF will become the from now on emphasis of one section research in period to a great extent.Immobilized microorganism-BAF (I-BAF) also will be a new developing direction.To make a variation bacterium and zymin of the domestic investigator of having is fixed on the macroporous netlike carrier and processes highly difficult organic industrial sewage as filler, the biological load amount can reach 3-10 times of traditional biological treatment process, pollutants removal rate has stronger denitrogenation dephosphorizing effect more than 95%.In sum, the development of BAF technique and the development of filler are closely bound up, and the exploitation of the high-tech filler take I-BAF as representative will be the main flow trend of BAF technological development; And efficient processing power and stability that the multilayer of multiple filler combination or multistage biological aerated filter process show in sewage treatment process will make it in one section another one important research direction that becomes BAF technique period from now on.The present invention compares with general BAF technique, can increase substantially its pollutant purification effect.
Summary of the invention
The objective of the invention is the problems referred to above for existing technology existence, a kind of BAF reactor for the treatment of electroplating wastewater is provided, technical problem to be solved by this invention is how to improve removal of pollutants rate in the electroplating wastewater.
Purpose of the present invention can realize by following technical proposal:
A kind of BAF reactor for the treatment of electroplating wastewater, it is characterized in that, described reactor comprises a reaction tank, described reaction tank is divided into reaction chamber one and reaction chamber two by a dividing plate, be provided with the filtering layer one take rigid foam as filler in the described reaction chamber one, be provided with in the described reaction chamber two with the filtering layer two of spherical lightweight biological ceramic particle as filler, described reactor also comprises respectively pump sump and the outlet sump that links with reaction chamber one and reaction chamber two, described reaction chamber two links to each other with an oxygen supply aeration tank, and described dividing plate is provided with the water hole of UNICOM's reaction chamber one and reaction chamber two.
Pending electroplating sewerage enters reaction chamber one through pump sump, by filtering layer one filtration take rigid foam as filler, floating foreign material in the waste water are filtered, waste water enters reaction chamber two through water hole, through the oxygen supply aeration waste gas is reacted, and spherical lightweight biological ceramic particle carries out barrier effect to the pollutent in the waste water, and waste water is purified.
In above-mentioned a kind of BAF reactor for the treatment of electroplating wastewater, the bottom of the top of described reaction chamber one and reaction chamber two all links to each other with a recoil pond, and described reaction tank is provided with the recoil water outlet.After this reactor work for some time, for guaranteeing the quality of filler, need to be to cleaning in the reaction tank, particularly microbial film is offered when wearing out in the reaction tank, need to clean, and guarantees quality of sewage disposal, back-flushing is clean clear water, enter reaction tank from the recoil pond, flow out from the recoil water outlet, reaction tank is carried out flushing type clean.
In above-mentioned a kind of BAF reactor for the treatment of electroplating wastewater, the bottom of described reaction chamber one and reaction chamber two all links to each other with a back flushing air pond.After this reactor work for some time, the oxygen level in the reaction tank changes, and affects the sewage degrading quality, need to process carrying out back flushing air in the reaction tank, recovers the oxygen characteristic that contains of this reactor.
In above-mentioned a kind of BAF reactor for the treatment of electroplating wastewater, the outer wall of described reaction tank is provided with some thief holes.This reactor is provided with three thief holes along the pool wall of reaction tank both sides, one of them thief hole is 60mm apart from the reactor bottom distance, be positioned at the lower end of filtering layer one, two other thief hole is 300mm apart from reactor bottom, be positioned at the upper end of filtering layer one and filtering layer two, three thief holes detect the degraded situation in the reactor respectively, for experiment and the improvement of degradation effect provide data.
In above-mentioned a kind of BAF reactor for the treatment of electroplating wastewater, the bottom of described reaction chamber two is provided with the cobble supporting layer that thickness is 50mm, and described supporting layer is positioned at the lower end of filtering layer two.The effect of cobble supporting layer is not affect under the prerequisite that current pass through, filtering layer two is supported, and also prevents that water hole from stopping up simultaneously.
In above-mentioned a kind of BAF reactor for the treatment of electroplating wastewater, the packing material size of described filtering layer one is 5～7mm, and the condiment particle diameter of described filtering layer two is 4～6mm.Filtering layer one mainly filters the floating matter in the sewage etc., and packing material size is large than the packing material size of filtering layer two.
In above-mentioned a kind of BAF reactor for the treatment of electroplating wastewater, be provided with a return line between described pump sump and the outlet sump.Recurrence rate is 50%, enters outlet sump Partial digestion water before and need to again enter reaction chamber one, can greatly improve by this method the clearance of Pollutants in Wastewater.
Compared with prior art, the present invention has the following advantages:
1, pending electroplating sewerage enters reaction chamber one through pump sump, by filtering layer one filtration take rigid foam as filler, floating foreign material in the waste water are filtered, waste water enters reaction chamber two through water hole, through the oxygen supply aeration waste gas is reacted, and spherical lightweight biological ceramic particle carries out barrier effect to the pollutent in the waste water, waste water is purified, compare with existing general sewage treatment process, can increase substantially the decontamination effect improving of pollutent.
2, in this reactor, be provided with a return line between pump sump and the outlet sump, recurrence rate is 50%, enters outlet sump Partial digestion water before and need to again enter reaction chamber one, can greatly improve by this method the clearance of Pollutants in Wastewater.
Description of drawings
Fig. 1 is the theory structure synoptic diagram of this BAF reactor.
The removal situation of CODcr tabulation in sewage when Fig. 2 is this reactor of one-shot.
The removal situation of NH3-N tabulation in sewage when Fig. 3 is this reactor of one-shot.
The removal situation of CODcr tabulation in sewage when Fig. 4 is this reactor of restarting.
The removal situation of NH3-N tabulation in sewage when Fig. 5 is this reactor of restarting.
Among the figure, 1, reaction tank; 11, reaction chamber one; 12, reaction chamber two; 2, dividing plate; 31, filtering layer one; 32, filtering layer two; 33, supporting layer; 41, pump sump; 42, outlet sump; 5, oxygen supply aeration tank; 6, water hole; 71, recoil pond; 72, recoil water outlet; 8, back flushing air pond; 9, thief hole; 10, return line.
Embodiment
Below be specific embodiments of the invention and by reference to the accompanying drawings, technical scheme of the present invention is further described, but the present invention be not limited to these embodiment.
A kind of BAF reactor for the treatment of electroplating wastewater, reactor comprises a reaction tank 1, described reaction tank 1 is divided into reaction chamber 1 and reaction chamber 2 12 by a dividing plate 2, be provided with the filtering layer 1 take rigid foam as filler in the described reaction chamber 1, be provided with in the described reaction chamber 2 12 with the filtering layer two 32 of spherical lightweight biological ceramic particle as filler, described reactor also comprises respectively pump sump 41 and the outlet sump 42 that links with reaction chamber 1 and reaction chamber 2 12, described reaction chamber 2 12 links to each other with an oxygen supply aeration tank 5, described dividing plate 2 is provided with the water hole 6 of UNICOM's reaction chamber 1 and reaction chamber 2 12, the bottom of the top of reaction chamber 1 and reaction chamber 2 12 all links to each other with a recoil pond 71, described reaction tank 1 is provided with recoil water outlet 72, after this reactor work for some time, for guaranteeing the quality of filler, need to be to cleaning in the reaction tank 1, particularly reaction tank 1 interior microbial film is offered when wearing out, need to clean, guarantee quality of sewage disposal, back-flushing is clean clear water, enter reaction tank 1 from recoil pond 71, flow out from recoil water outlet 72, reaction tank 1 is carried out flushing type clean; The bottom of reaction chamber 1 and reaction chamber 2 12 all links to each other with a back flushing air pond 8, after this reactor work for some time, the oxygen level in the reaction tank 1 changes, and affects the sewage degrading quality, need to process carrying out back flushing air in the reaction tank 1, recover the oxygen characteristic that contains of this reactor.
The outer wall of reaction tank 1 is provided with some thief holes 9, this reactor is provided with three thief holes 9 along the pool wall of reaction tank 1 both sides, one of them thief hole 9 is 60mm apart from the reactor bottom distance, be positioned at the lower end of filtering layer 1, two other thief hole 9 is 300mm apart from reactor bottom, be positioned at the upper end of filtering layer 1 and filtering layer 2 32, three thief holes 9 detect the degraded situation in the reactor respectively, for experiment and the improvement of degradation effect provide data, the bottom of reaction chamber 2 12 is provided with the cobble supporting layer 33 that thickness is 50mm, described supporting layer 33 is positioned at the lower end of filtering layer 2 32, the effect of cobble supporting layer 33 is not affect under the prerequisite that current pass through, filtering layer 2 32 is supported, prevent also simultaneously that water hole 6 from stopping up, the packing material size of filtering layer 1 is 5～7mm, the condiment particle diameter of described filtering layer 2 32 is 4～6mm, filtering layer 1 mainly filters the floating matter in the sewage etc., packing material size is large than the packing material size of filtering layer 2 32, be provided with a return line 10 between pump sump 41 and the outlet sump 42, recurrence rate is 50%, enter outlet sump 42 Partial digestion water before and need to again enter reaction chamber 1, can greatly improve by this method the clearance of Pollutants in Wastewater.
Pending electroplating sewerage enters reaction chamber 1 through pump sump 41, filter by the filtering layer 1 take rigid foam as filler, floating foreign material in the waste water are filtered, waste water enters reaction chamber 2 12 through water hole 6, through the oxygen supply aeration waste gas is reacted, and spherical lightweight biological ceramic particle carries out barrier effect to the pollutent in the waste water, and waste water is purified.
Waste water is taken from the actual discharge waste water of Jiangning county one Electroplate Factory, after testing its chemical oxygen demand COD cr, ammonia-nitrogen content NH3-N, phosphorus content TP, temperature SS and pH value such as following table:
As follows for the method that adopts this reactor degrading waste water pollutent:
The one-shot stage
Start 5 pairs of reaction chambers in oxygen supply aeration tank 2 12 and carry out aeration, as seen from Figure 2, continuously 3d is vexed expose to the sun during, system CODcr clearance increases to more than 70% gradually, the removal effect increase is very remarkable, and analyzing mainly is that air-flow constantly stirs between filtrate because in the vexed quick-fried process, thereafter emptying mud mixture is difficult for making mud to cause pore plugging in the filling surface deposition, thereby guarantees that microorganism is easy to be bonded to the filler top layer.When system moved with the 2L/h flow in 4 days subsequently, the clearance of system CODcr was comparatively stable, from the 7th day, the CODcr clearance remains on about 90%, water outlet CODcr concentration stabilize is below 35mg/L, and the initial start-up biofilm is comparatively smooth, substantially meets and exceeds desired result.
As seen from Figure 3, front 7 days, the removal effect of NH3-N was not very stable, but clearance is totally in rising trend, and from biofilm the 8th day, the removal of NH3-N tended towards stability, and remains on more than 85%.Compare with the degraded of the CODcr of Fig. 2, the degraded of NH3-N shows obvious hysteresis quality in removal effect, analyze its reason, mainly be because in plug flow reactor, exist competitive relation between carbonization heterotrophic bacterium and the nitrated autotrophic bacteria, organism has restraining effect to the Autotrophic nitrification bacterium, so along water (flow) direction generally should be organism obtain first the degraded, then the removal effect of NH3-N just strengthens gradually, so show certain hysteresis quality.Count from the reactor biofilm, through about about 10 days time, the CODcr of system and the clearance of NH3-N reach respectively more than 90% and 85%, and water outlet CODcr and NH3-N concentration stabilize remain on 35mg/L.
(2) the restarting stage
Total clearance of restarting stage CODcr and NH3-N concerns as shown in Figure 4 and Figure 5 over time.After restarting begins, continuous increase along with the electroplating wastewater ratio, from the 11st day to the 15th day, the Amplitude Ratio that water outlet CODcr concentration increases is larger, be increased to 95.62mg/L from 32.2mg/L, clearance has dropped to minimum 48.33%, the NH3-N concentration of water outlet is also along with the continuous rising of water outlet CODcr concentration is in rising trend, wherein the 15th of reactor start-up the day, water outlet CODcr and NH3-N concentration are increased to 95.62mg/L and 4.05mg/L from the 14th day 67.9mg/L and 2.07mg/L respectively, show that microbial film begins aging coming off, affect effluent quality, therefore need to start the 71 pairs of reactors in recoil pond and carry out back flushing.Water outlet in the 16th day is detected, and CODcr and NH3-N concentration drop to respectively 84.5mg/L and 2.65mg/L, illustrate that the microbial film resume speed is very fast, and the anti impulsion load ability is strong, degree of fixation good.Stable gradually to the removal effect of CODcr and NH3-N from biofilm beginning in the 20th day reactor, clearance is about 66% and 70% and grow steadily, and water outlet is up to standard, and electroplating wastewater also is replaced by in water inlet fully, the whole start-up courses that show reactor finish, the biofilm success.
At the restarting initial stage, the clearance of system CODcr and NH3-N presents falling tendency, mainly be continuing to increase owing to electroplating wastewater ratio in the water inlet, environment of system changes, the microbe population that can adapt to electroplating wastewater is poor, and unconformable microorganism mortality causes the removal rates of system to descend rapidly, in case and the microorganism amount reproduction of such waste water of degradable, the removal rates of system just can grow steadily.New type foldable BAF has fabulous treatment effect for electroplating wastewater.
Specific embodiment described herein only is to the explanation for example of the present invention's spirit.Those skilled in the art can make various modifications or replenish or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present invention or surmount the defined scope of appended claims.
Claims (7)
1. BAF reactor for the treatment of electroplating wastewater, it is characterized in that, described reactor comprises a reaction tank (1), described reaction tank (1) is divided into reaction chamber one (11) and reaction chamber two (12) by a dividing plate (2), be provided with the filtering layer one (31) take rigid foam as filler in the described reaction chamber one (11), be provided with in the described reaction chamber two (12) with the filtering layer two (32) of spherical lightweight biological ceramic particle as filler, described reactor also comprises respectively pump sump (41) and the outlet sump (42) that links with reaction chamber one (11) and reaction chamber two (12), described reaction chamber two (12) links to each other with an oxygen supply aeration tank (5), and described dividing plate (2) is provided with the water hole (6) of UNICOM's reaction chamber one (11) and reaction chamber two (12).
2. a kind of BAF reactor for the treatment of electroplating wastewater according to claim 1, it is characterized in that, the bottom of the top of described reaction chamber one (11) and reaction chamber two (12) all links to each other with a recoil pond (71), and described reaction tank (1) is provided with recoil water outlet (72).
3. a kind of BAF reactor for the treatment of electroplating wastewater according to claim 1 and 2 is characterized in that, the bottom of described reaction chamber one (11) and reaction chamber two (12) all links to each other with a back flushing air pond (8).
4. a kind of BAF reactor for the treatment of electroplating wastewater according to claim 1 and 2 is characterized in that the outer wall of described reaction tank (1) is provided with some thief holes (9).
5. a kind of BAF reactor for the treatment of electroplating wastewater according to claim 1 and 2, it is characterized in that, the bottom of described reaction chamber two (12) is provided with the cobble supporting layer (33) that thickness is 50mm, and described supporting layer (33) is positioned at the lower end of filtering layer two (32).
6. a kind of BAF reactor for the treatment of electroplating wastewater according to claim 1 and 2 is characterized in that the packing material size of described filtering layer one (31) is 5～7mm, and the condiment particle diameter of described filtering layer two (32) is 4～6mm.
7. a kind of BAF reactor for the treatment of electroplating wastewater according to claim 1 and 2 is characterized in that, is provided with a return line (10) between described pump sump (41) and the outlet sump (42).
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106698645A (en) * | 2016-12-19 | 2017-05-24 | 大连爱特流体控制有限公司 | Multiphase flow dynamic membrane aerobic sludge-membrane symbiotic reactor |
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| JP2002143880A (en) * | 2000-11-15 | 2002-05-21 | Japan Sewage Works Agency | Device for biological treatment of waste water |
| CN101050025A (en) * | 2007-03-30 | 2007-10-10 | 南京大学 | Aeration bio filter in U shaped flow |
| CN101746879A (en) * | 2010-02-11 | 2010-06-23 | 黄昊 | Aeration biological filter bed and sewage advanced treatment method thereof |
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- 2013-07-01 CN CN2013102756733A patent/CN103351054A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002143880A (en) * | 2000-11-15 | 2002-05-21 | Japan Sewage Works Agency | Device for biological treatment of waste water |
| CN101050025A (en) * | 2007-03-30 | 2007-10-10 | 南京大学 | Aeration bio filter in U shaped flow |
| CN101746879A (en) * | 2010-02-11 | 2010-06-23 | 黄昊 | Aeration biological filter bed and sewage advanced treatment method thereof |
Non-Patent Citations (1)
| Title |
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| 闫懂懂等: "折叠BAF工艺处理电镀废水启动性能研究", 《工业水处理》, vol. 28, no. 8, 31 August 2008 (2008-08-31) * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106698645A (en) * | 2016-12-19 | 2017-05-24 | 大连爱特流体控制有限公司 | Multiphase flow dynamic membrane aerobic sludge-membrane symbiotic reactor |
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Application publication date: 20131016 |