CN203715447U - Electroplating comprehensive waste water treatment system - Google Patents
Electroplating comprehensive waste water treatment system Download PDFInfo
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- CN203715447U CN203715447U CN201320833851.5U CN201320833851U CN203715447U CN 203715447 U CN203715447 U CN 203715447U CN 201320833851 U CN201320833851 U CN 201320833851U CN 203715447 U CN203715447 U CN 203715447U
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- waste water
- chlorination
- tank
- ammonia nitrogen
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Abstract
The utility model relates an electroplating comprehensive waste water treatment system. The electroplating comprehensive waste water treatment system comprises a Fenton process reaction tank, an inclined plate sedimentation tank, a chlorination tank and a biological activated carbon treatment device, wherein the Fenton process reaction tank is used for receiving electroplating comprehensive waste water, a Fenton reagent is added into the Fenton process reaction tank, the electroplating comprehensive waste water is treated under the environment that pH value is 2-4, oxidation complex is broken, COD (chemical oxygen demand) and ammonia nitrogen are oxidized and degraded, hexavalent chromium is reduced and heavy metal irons are removed when a reaction is carried out; the inclined plate sedimentation tank is connected with the Fenton process reaction tank, pretreated waste water is added, alkaline liquor is added into the inclined plate sedimentation tank for regulating pH value to be more than 10, and coagulating sedimentation is carried out; the chlorination tank is connected with the inclined plate sedimentation tank, supernate is added into the inclined plate sedimentation tank, and sodium hypochlorite is added in a breakpoint chlorination way for removing the ammonia nitrogen in a liquid; and the biological activated carbon treatment device is connected with the chlorination tank, the liquid is added into the chlorination tank, so that degradation-resistant organic matter and the ammonia nitrogen in the liquid are further degraded.
Description
Technical field
The utility model relates to field of waste water treatment, especially relates to a kind of electroplating comprehensive waste water treatment system.
Background technology
Electroplating industry is a typical heavy polluted industry.In electroplating process, need to use a large amount of strong acid, highly basic, heavy metallic salt, organic additive, even comprise the poisonous and harmful chemical such as prussiate, chromic anhydride.These chemical are in process of production with discharge of wastewater.For the pollutent of electroplating wastewater, controlled and concentrated on heavy metal pollutant in the past.But the deep enforcement along with < < plating pollutant emission standard GB21900-2008 > >, country starts the pollutent in electroplating industry waste water to carry out total divisor control up to standard when proposing higher heavy metal processing requirements, wherein mainly comprises COD and ammonia nitrogen palpus qualified discharge in waste water.
Sample survey demonstration, in the electroplating effluent treatment method that Electroplate Factory adopts at present, chemical precipitation method accounts for more than 80%, and wherein sloping plate deposition accounts for 72%, and air supporting accounts for 8.1%.Ion exchange method accounts for 12%, and electrolytic process accounts for 2.3%, and the methods such as reverse osmosis, absorption account for 5.5%.Therefrom can see, electroplating waste water treatment technology, is mainly the removal for heavy metal contaminants, and the pollution factors such as the COD in waste water, ammonia nitrogen is not almost had to removal effect at present.In addition, the additive using in plating can form stable complex compound with heavy metal ion, and at present conventional electroplating effluent treatment method also has problems heavy metal out of electroplating wastewater is reached aspect more strict emission standard.
For meeting the needs of comprehensive qualified discharge, the treatment process of a kind of better electroplating comprehensive waste water of expectation exploitation.
Utility model content
Technical problem to be solved in the utility model is to provide a kind of electroplating comprehensive waste water treatment system, to realize the comprehensively up to standard of processed waste water.
The utility model is that to solve the problems of the technologies described above the technical scheme adopting be to propose a kind of electroplating comprehensive waste water treatment system, comprise: Fenton process reactive tank, receive this electroplating comprehensive waste water, this Fenton process reactive tank input Fenton reagent this electroplating comprehensive waste water of pre-treatment under the environment of pH value 2-4, is oxidized contact break, oxidative degradation COD and ammonia nitrogen, reduction of hexavalent chromium and heavy-metal ion removal by reaction; Inclined-plate clarifying basin, connects this Fenton process reactive tank, passes into pretreated waste water, and this inclined-plate clarifying basin input alkali lye, with more than regulating pH value to 10, carries out coagulating sedimentation; Chlorination groove, connects this inclined-plate clarifying basin, passes into the supernatant liquor of this inclined-plate clarifying basin, and the clorox that input adds in break point chlorination mode is removed the ammonia nitrogen in liquid; And biological activated carbon treatment unit, connect this chlorination groove, pass into the liquid of chlorination groove, with the hardly degraded organic substance in further degradation liquid and ammonia nitrogen.
In an embodiment of the present utility model, said system also comprises mud receiving tank, inputs the precipitating sludge in this inclined-plate clarifying basin.
In an embodiment of the present utility model, said system also comprises sand filtration strainer, is connected between this chlorination groove and this biological activated carbon treatment unit.
Technique scheme of the present utility model can allow the comprehensive qualified discharge of electroplating comprehensive waste water, and due to closely collaborative between each technology and equipment, makes flow process very simple, operates simple and easyly, and running maintenance is convenient, and treatment effect is reliable and stable.
Accompanying drawing explanation
For above-mentioned purpose of the present utility model, feature and advantage can be become apparent, below in conjunction with accompanying drawing, embodiment of the present utility model is elaborated, wherein:
Fig. 1 illustrates the electroplating comprehensive waste water treatment system of the utility model one embodiment.
Fig. 2 illustrates the electroplating comprehensive waste water treatment scheme of the utility model one embodiment.
Embodiment
Embodiment of the present utility model describes electroplating comprehensive waste water treatment system.The current the whole bag of tricks for the treatment of electroplating comprehensive waste water, methods such as ramps Precipitation method, By Bubble-floating Method, ion exchange method, electrolytic process, reverse osmosis, absorption, mainly for the removal of heavy metal contaminants, does not almost have removal effect to pollution factors such as the COD in waste water, ammonia nitrogens.And at heavy metal contaminants during in complex state, aforesaid method is not easy ream weight metal pollutant and is reduced to the degree that meets standard.Therefore need a kind of new treatment process.Because the pollutant component in electroplating comprehensive waste water has many kinds, therefore need combination process to remove comprehensively.For pollutant components such as heavy metal contaminants, ammonia nitrogen, COD, respectively there are many optional methods at present.Yet select simply several process combination, can not play good treatment effect.Reason is, the complicated component of waste water, for the treatment process of a certain composition, may have negative impact to the processing of another composition.
Embodiment of the present utility model is after considering the water quality characteristics of electroplating wastewater and the distinct advantages of each treatment process, creatively proposes integrated materialization and biochemical treatment in the comprehensive qualified discharge combination process of electroplating comprehensive waste water of one.
Embodiment of the present utility model is as follows for the water quality of electroplating comprehensive waste water: (1) pH value is generally 2～4; (2) general containing just like organic additives such as citric acid, xitix, tartrate, oxalic acid, EDTA in water, these additives can form stable complex compound with metal ion, make metal ion present the features such as nonionic state.
Fig. 1 illustrates the electroplating comprehensive waste water treatment system of the utility model one embodiment.Shown in figure 1, system 100 comprises waste water collection tank 101, Fenton process reactive tank 102, inclined-plate clarifying basin 103, chlorination groove 104, sand filtration strainer 105, biological activated carbon treatment unit 106, terminal tank 107, mud receiving tank 108 and pressure filter 109 etc.These equipment connect by mode shown in figure.Waste water collection tank 101 is for collecting the waste water of Electroplating Production.Terminal tank 107 is for by qualified processing water qualified discharge.For example, be disposed to municipal wastewater pipe network.
The system of the present embodiment is to implement according to the combination process of Fenton (Fenton) method, swash plate coagulating sedimentation, break point chlorination, sand filtration, biological activated carbon.
The Fenton reagent that Fenton process is used is by H
2o
2and Fe
2+a kind of strong oxidizer being mixed to get, can be oxidized organism and reducing substances in sewage well.The reaction mechanism of Fenton process is: under acidic conditions, and H
2o
2at Fe
2+catalyst action under produce two kinds of active hydroxyl free radical (HO
2and OH), wherein the oxidation capacity of OH is up to 2.80V, be only second to fluorine, and OH free radical has very high electronegativity or Electron Affinities, its electron affinity power is up to 569.3kJ, there is very strong addition reaction characteristic, thereby cause and propagate radical chain reaction, accelerate the oxidation of organism and reducing substances; While Fe
2+be oxidized to Fe
3+produce coagulating sedimentation, remove a large amount of pollutents.Therefore, Fenton reagent has oxidation and two kinds of effects of coagulation in water treatment.
The most of organism of Fenton process in can oxidizing water, are applicable to processing difficult for biological degradation and the general reluctant waste water of physico-chemical process; And be difficult to be oxidized persistent organism for general reagent, and particularly aromatic compounds and some heterocyclic compounds, Fenton reagent can be without selectively oxidative degradation to the overwhelming majority wherein.Fenton oxidation method is compared with other advanced oxidation processes, have simple to operate, reaction fast, can produce the advantages such as flocculation.
By research, find, except oxidation and coagulation, Fenton process is applied to electroplating comprehensive waste water and also has another vital role, utilizes divalence Fe
2+under acidic conditions, carry out acidifying contact break, the metal ion of complex state is converted into free state.Like this, in conjunction with aforesaid coagulation, just can remove the heavy metal ion in water.And electroplating comprehensive waste water is without regulating pH value can meet Fenton process reaction conditions.By reading, hereinafter also can find, Fenton process can be collaborative mutually with subsequent processing steps well.
In the present embodiment, the electroplating comprehensive waste water that Fenton process reactive tank 102 receives from waste water collection tank 101, then inputs Fenton reagent this electroplating comprehensive waste water of pre-treatment under the environment of pH value 2-4.
Utilize Fenton reagent carry out pre-treatment can oxygenolysis waste water in some organic pollutants and ammonia nitrogen, general COD and ammonia nitrogen removal frank can reach respectively 50% and 25% left and right.Fenton reagent plays the effect of oxidation contact break simultaneously, makes complex state metal ion be converted into free state, improves follow-up coagulating sedimentation efficiency, and by adding excessive Fe
2+ion can play the effect of reduction of hexavalent chromium.Underwater gold belongs to the coagulating sedimentation effect of ion by Fenton process and is able to efficient removal.In sum, Fenton process pretreatment process can obtain the multi task process effects such as oxidation contact break, oxidative degradation COD and ammonia nitrogen, reduction of hexavalent chromium, heavy-metal ion removal.
For electroplating comprehensive waste water water quality characteristics, the Fenton process processing condition of a preferred embodiment are: initial pH value 2～3, FeSO
47H
2o and 30%H
2o
2mol ratio is 1～1.2:1,30%H
2o
2with COD mass concentration ratio in waste water be 5～6:1, the reaction times is controlled at more than 0.5 hour.
Inclined-plate clarifying basin 103 connects Fenton process reactive tank 102, passes into through pretreated waste water.For example, at inclined-plate clarifying basin 103 input alkali lye (NaOH), with more than regulating pH value to 10, carry out coagulating sedimentation.Preferably, also can add PAM(Polyacrylamide, polyacrylamide polyacrylamide) coagulating agent is solidifying to help.The mud of coagulating sedimentation is delivered to mud receiving tank 108, and mud outward transport after pressure filter 109 is processed.
For making ammonia nitrogen realize qualified discharge, the present embodiment carries out ammonia nitrogen oxygenolysis.In this area, there is the method for many removal ammonia nitrogens, such as blow-off method, absorption method, membrane separation technique, biological denitrificaion, magnesium ammonium phosphate (MAP) precipitator method, chemical oxidization method etc.Blow-off method and magnesium ammonium phosphate (MAP) precipitator method are generally processed the ammonia nitrogen waste water of high density, and energy consumption is larger.Absorption method is generally used some sorbent materials, and as zeolite, gac, the method exists adsorbent reactivation problem, and sorbent material need regularly replace and dispose, and treatment effect is unstable.Film vulnerable to pollution in membrane separating method, investment and running cost are high.Bio-denitrification technology is generally applied to the denitrogenation of city domestic sewage, and floor space is larger, and Electroplate Factory is difficult to use.For electroplating comprehensive waste water, find to use break point chlorination method, have easy and simple to handlely, be easy to control, be not subject to the impact of temperature, without changing the original technique of water factory, do not need the advantages such as newly-built water processing establishment yet, treatment effect is stable.Consider in electroplating comprehensive waste water simultaneously and may also contain a certain amount of prussiate, when utilizing break point chlorination method to process ammonia nitrogen, have the effect of broken cyanide concurrently.
Advantageously, through investigation, the general 20～50mg/L of ammonia nitrogen concentration in electroplating comprehensive waste water, through the pretreated waste water ph of Fenton, in 10 left and right, heavy metal is removed substantially, and these all meet the optimum reaction condition of break point chlorination method.Break point chlorination method generally can reach more than 70% the clearance of ammonia nitrogen.
Chlorination groove 104 connects inclined-plate clarifying basin 103, passes into the supernatant liquor of inclined-plate clarifying basin 103, and the clorox that input adds in break point chlorination mode is removed the ammonia nitrogen in liquid.
For electroplating comprehensive waste water water quality characteristics, when removing ammonia nitrogen, break point chlorination method takes into account broken cyanide.In one embodiment, the processing condition of break point chlorination method are: pH value 9～10.5, and available chlorine is used clorox, and the mass ratio of available chlorine and ammonia nitrogen is 10～12:1, reaction times 0.5-1 hour.
Optionally, can after break point chlorination method, use sand filtration strainer 105, the granule foreign in filtered wastewater.
By Fenton process, swash plate flocculation sediment, break point chlorination, sand filtration technique, can't guarantee the total divisor qualified discharge of electroplating comprehensive waste water, therefore need to introduce a kind of final " checking on " technique---biological activated carbon.Biological activated carbon be by microbial inoculant in activated carbon column, utilize microbiological oxidation and organic decomposition effect in the absorption of gac and active carbon layer, gac is carried out to " bio-regeneration ".Because can being first retained in hardly degraded organic substance more by force, activated carbon adsorptive capacity in activated carbon column, treats biological carbonoxide, gac is as the existence carrier of microorganism simultaneously, offset some detrimentally affects of external environment, as high in salinity, solved the problem of toxicity accumulation.Biological activated carbon is as a kind of advanced treatment process, because of its pollutent such as hardly degraded organic substance and ammonia nitrogen of effectively degrading, and running maintenance to compare other biochemical processs simple and easy, can realize the advantages such as automatic operating.
The advantage of the present embodiment is, after Fenton process is processed, heavy metal ion, toxic organic compound are effectively addressed, biodegradability improves, and can select comparatively easy biological activated carbon method, and not need the common biochemical processs such as complicated many biological hydrolysis, bio-oxidation.
Biological activated carbon not only can reduce COD in electroplating wastewater effectively, and has denitrification dephosphorization function.Therefore, the organic contamination feature of the technical characterstic of biological activated carbon and electroplating wastewater is very identical.
Use in the present embodiment biological activated carbon treatment unit 106, connect chlorination groove 104, pass into the liquid of chlorination groove, with the hardly degraded organic substance in further degradation liquid and ammonia nitrogen.The time stopping in wastewater biological activated carbon treatment device 106 is conventionally enough at 1 hour.But be appreciated that the residence time is longer, treatment effect is better, so the residence time can be greater than 1 hour.
Because electroplating comprehensive waste water is after Fenton process, swash plate flocculation sediment, break point chlorination method, sand filtration operation are processed, heavy metal ions in wastewater is removed substantially completely, COD and ammonia nitrogen major part are degraded, and wastewater biochemical is improved because of the effect of front end chemical oxidation.Finally utilize biological activated carbon, guarantee the stable comprehensively up to standard of final outflow water.
Fig. 2 illustrates the electroplating comprehensive waste water treatment scheme of the utility model one embodiment.Conclude, the electroplating comprehensive waste water of the utility model one embodiment is processed and is comprised the steps:
Step 201, electroplating comprehensive waste water is passed into Fenton process reactive tank 102, use Fenton reagent this electroplating comprehensive waste water of pre-treatment under the environment of pH value 2-4, by reaction, be oxidized contact break, oxidative degradation COD and ammonia nitrogen, reduction of hexavalent chromium and heavy-metal ion removal.
Step 202, passes into inclined-plate clarifying basin 103 by pretreated waste water, more than regulating pH value to 10, carries out coagulating sedimentation.
Step 203, passes into chlorination groove 104 by the supernatant liquor of inclined-plate clarifying basin 103, in break point chlorination mode, adds clorox, removes the ammonia nitrogen in liquid.
Step 204, optional, use sand filtration strainer 105, the granule foreign in filtered wastewater.
Step 205, passes into biological activated carbon treatment unit 106 by the liquid of sand filtration strainer 105, with the hardly degraded organic substance in further degradation liquid and ammonia nitrogen.
The treatment effect of the utility model embodiment is below described with actual example.
Adopt the utility model to process actual electroplating comprehensive waste water, this waste water quality and result are in Table 1.Fenton technology parameter is initial pH value 2～3, FeSO
47H
2o and 30%H
2o
2mol ratio is 1.2:1,30%H
2o
2with COD mass concentration ratio in water be 6:1, the reaction times is controlled at 1.0 hours, precipitation pH value 10.Break point chlorination method processing parameter is: pH value 9.5 left and right, and available chlorine is used clorox, and the mass ratio of available chlorine and ammonia nitrogen is 10:1, about 30 minutes reaction times.1 hour effective residence time of biological activated carbon.
The actual electroplating comprehensive waste water effect of table 1 the utility model art breading
From table 1, the indices of waste water all can reach table 3 standard of electroplating pollutant emission standard GB21900-2008.
The electroplating comprehensive waste water treatment system of the utility model embodiment, closely collaborative between each treatment step and equipment.Specifically, first according to the initial water-quality guideline of electroplating comprehensive waste water, select Fenton process to carry out pre-treatment, before processing, do not needed to carry out the additional steps such as pH value adjusting; Secondly, the waste water ph after Fenton process flocculation sediment is also applicable to directly carrying out break point chlorination, does not also need to carry out pH value and regulates; Moreover due to after Fenton process processes, heavy metal ion, toxic organic compound are effectively addressed, biodegradability improves, and can select that comparatively simple biochemical system---biological activated carbon is processed, and system is simplified, and the reaction times also reduces greatly.The treatment system of the utility model embodiment only need combine the minority techniques such as Fenton process, swash plate coagulating sedimentation, break point chlorination, sand filtration, biological activated carbon, have flow process simple, operate simple and easy, the advantage such as running maintenance is convenient, and treatment effect is reliable and stable.
Although the utility model discloses as above with preferred embodiment; so it is not in order to limit the utility model; any those skilled in the art; within not departing from spirit and scope of the present utility model; when doing a little modification and perfect, therefore protection domain of the present utility model is worked as with being as the criterion that claims were defined.
Claims (3)
1. an electroplating comprehensive waste water treatment system, is characterized in that, comprising:
Fenton process reactive tank, receive this electroplating comprehensive waste water, this Fenton process reactive tank input Fenton reagent this electroplating comprehensive waste water of pre-treatment under the environment of pH value 2-4, is oxidized contact break, oxidative degradation COD and ammonia nitrogen, reduction of hexavalent chromium and heavy-metal ion removal by reaction;
Inclined-plate clarifying basin, connects this Fenton process reactive tank, passes into pretreated waste water, and this inclined-plate clarifying basin input alkali lye, with more than regulating pH value to 10, carries out coagulating sedimentation;
Chlorination groove, connects this inclined-plate clarifying basin, passes into the supernatant liquor of this inclined-plate clarifying basin, and the clorox that input adds in break point chlorination mode is removed the ammonia nitrogen in liquid; And
Biological activated carbon treatment unit, connects this chlorination groove, passes into the liquid of chlorination groove, with the hardly degraded organic substance in further degradation liquid and ammonia nitrogen.
2. the system as claimed in claim 1, is characterized in that, also comprises mud receiving tank, inputs the precipitating sludge in this inclined-plate clarifying basin.
3. the system as claimed in claim 1, is characterized in that, also comprises sand filtration strainer, is connected between this chlorination groove and this biological activated carbon treatment unit.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104710072A (en) * | 2013-12-17 | 2015-06-17 | 上海轻工业研究所有限公司 | Electroplating synthetical wastewater treatment method and system |
| CN104724858A (en) * | 2015-04-01 | 2015-06-24 | 绍兴柯桥江滨水处理有限公司 | Chemical mother solution wastewater treatment facility and treatment method |
| CN104925987A (en) * | 2015-05-13 | 2015-09-23 | 中山大学 | Treatment method for complex metal wastewater |
| CN105000711A (en) * | 2015-07-14 | 2015-10-28 | 深圳市绿沁环保科技有限公司 | Nickel-containing combined electroplating wastewater treatment device and method |
| CN105800822A (en) * | 2014-12-30 | 2016-07-27 | 上海轻工业研究所有限公司 | Method and equipment for standards-reaching treatment of chemical nickel plating waste liquid |
| CN106431830A (en) * | 2016-08-11 | 2017-02-22 | 刘定忠 | Decomposition method of tetramethyl ammonium hydroxide solution and decomposition device thereof |
| CN108423875A (en) * | 2018-04-03 | 2018-08-21 | 上海班德环保科技股份有限公司 | Rare Earth Separation processing waste water processing equipment and its processing method |
| CN108545871A (en) * | 2018-06-20 | 2018-09-18 | 东莞汇金环境科技有限公司 | A kind of circuit-board industry chemical nickel waste water treatment system and its processing method |
| CN109502878A (en) * | 2017-09-15 | 2019-03-22 | 上海江柘环境工程技术有限公司 | A kind of electroplating waste water treatment system and its processing method |
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| CN104710072A (en) * | 2013-12-17 | 2015-06-17 | 上海轻工业研究所有限公司 | Electroplating synthetical wastewater treatment method and system |
| CN105800822A (en) * | 2014-12-30 | 2016-07-27 | 上海轻工业研究所有限公司 | Method and equipment for standards-reaching treatment of chemical nickel plating waste liquid |
| CN104724858A (en) * | 2015-04-01 | 2015-06-24 | 绍兴柯桥江滨水处理有限公司 | Chemical mother solution wastewater treatment facility and treatment method |
| CN104925987A (en) * | 2015-05-13 | 2015-09-23 | 中山大学 | Treatment method for complex metal wastewater |
| CN105000711A (en) * | 2015-07-14 | 2015-10-28 | 深圳市绿沁环保科技有限公司 | Nickel-containing combined electroplating wastewater treatment device and method |
| CN105000711B (en) * | 2015-07-14 | 2018-02-16 | 深圳市绿沁环保科技有限公司 | A kind of method for handling the electroplating comprehensive waste water containing chemical nickel |
| CN106431830A (en) * | 2016-08-11 | 2017-02-22 | 刘定忠 | Decomposition method of tetramethyl ammonium hydroxide solution and decomposition device thereof |
| CN106431830B (en) * | 2016-08-11 | 2020-03-31 | 刘定忠 | Method and apparatus for decomposing tetramethylammonium hydroxide solution |
| CN109502878A (en) * | 2017-09-15 | 2019-03-22 | 上海江柘环境工程技术有限公司 | A kind of electroplating waste water treatment system and its processing method |
| CN108423875A (en) * | 2018-04-03 | 2018-08-21 | 上海班德环保科技股份有限公司 | Rare Earth Separation processing waste water processing equipment and its processing method |
| CN108545871A (en) * | 2018-06-20 | 2018-09-18 | 东莞汇金环境科技有限公司 | A kind of circuit-board industry chemical nickel waste water treatment system and its processing method |
| CN113003795A (en) * | 2021-04-30 | 2021-06-22 | 中持水务股份有限公司 | Wastewater coupling treatment equipment and wastewater treatment method |
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