CN104355347A - Ammonia-nitrogen wastewater physical-chemical process integrated combined treatment device - Google Patents
Ammonia-nitrogen wastewater physical-chemical process integrated combined treatment device Download PDFInfo
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- CN104355347A CN104355347A CN201410624136.XA CN201410624136A CN104355347A CN 104355347 A CN104355347 A CN 104355347A CN 201410624136 A CN201410624136 A CN 201410624136A CN 104355347 A CN104355347 A CN 104355347A
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- ammonia nitrogen
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/16—Nature of the water, waste water, sewage or sludge to be treated from metallurgical processes, i.e. from the production, refining or treatment of metals, e.g. galvanic wastes
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
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- Inorganic Chemistry (AREA)
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Abstract
The invention discloses an ammonia-nitrogen wastewater physical-chemical process integrated combined treatment device. In accordance with different ammonia-nitrogen concentrations in wastewater, the device mainly consists of any one or any combinations of an air stripping module, a circulating air stripping module, a chemical precipitation dosing module and a tail gas absorbing module. According to the treatment device disclosed by the invention, in accordance with characteristics of electroplating wastewater, a falling film absorption tower is taken as an air stripping tower and the electroplating wastewater subjected to air stripping continues to be removed by virtue of a chemical precipitation method, so that by carrying out the air stripping and the chemical precipitation method in a same tower, the treatment device not only can treat the high-concentration ammonia-nitrogen wastewater to the standard in one time, but also is impact in structure, small in occupied area and strong in practicability.
Description
Technical field
The present invention relates to technical field of sewage, what be specifically related to is ammonia nitrogen device in a kind of close-coupled processing waste water, comprise physics and chemical process, its Combined Processing effect makes ammonia nitrogen emission concentration reach " integrated wastewater discharge standard " (GB8978-1996) and the requirement of " plating pollutant emission standard " (GB21900-2008) first grade discharging.
Background technology
Due to technology and processing cost aspect, many enterprises of China only carry out advanced treatment to COD when sewage effluent, and often have ignored the process to ammonia nitrogen.In waste water, the formation of ammonia nitrogen mainly contains two kinds, a kind of ammonia nitrogen being ammoniacal liquor and being formed, a kind of ammonia nitrogen being inorganic ammonium salt and being formed, mainly ammonium sulfate, ammonium chloride etc.Ammonia nitrogen is one of important factor causing body eutrophication, and when recycling this kind of sewage, ammonia nitrogen concentration height also can produce corrosive nature to pipeline, shortens the life-span of e-quipment and pipe, increases maintenance cost.
At present, the method for industrial ammonia nitrogen waste water process mainly contains physico-chemical process and biological method.Wherein, conventional blow-off method, absorption method, membrane technique, chemical precipitation method, break point chlorination belong to physico-chemical process.Biological method can be divided into traditional nitration denitrification method and novel short-cut nitrification and denitrification method, simultaneous nitrification-denitrification method, Anammox method etc.
Ammonia nitrogen in the electroplating wastewater feature that often concentration is high, COD is low, its ammonia nitrogen waste water concentration reaches more than 500mg/L usually, and COD usually at 200mg/L once, is difficult to be removed by biological process.For the plating ammonia nitrogen waste water of high density, air stripping method is generally adopted to carry out pre-treatment at present.Air stripping method removes has the advantage that energy consumption is low, equipment is simple, easy to operate, and the ammonia nitrogen waste water for high density adopts air stripping method both economical feasible, and available sulfuric acid makes the ammonia nitrogen that absorption agent absorption stripping goes out simultaneously, and the ammonium sulfate of generation can be made into chemical fertilizer.But air stripping method also has its shortcoming, the final ammonia nitrogen concentration of usual blow-off method only can reach about 100mg/L, is difficult to the emission request reaching electroplating wastewater.On the other hand, in electroplating wastewater part ammonia nitrogen be exist with the form of cupric ammine complex, when the ammonia nitrogen in water is with copper ammonia complexation ion [Cu (NH
3)
4]
2+when existing, a part of ammonia nitrogen is bound in complexing ion, and this just requires to increase packed height, improves stripping time, but common fillers tower resistance drop is large, is difficult to the ammonia nitrogen removal meeting complex state.Therefore, for electroplating wastewater NH_3-N treating, need stripping tower specialized designs on the one hand, reach desirable stripping effect, further process is also needed to the ammonia nitrogen waste water through stripping simultaneously, make the waste water of final process reach emission request.
For the plating ammonia nitrogen waste water of lower concentration, the method usually adopted is absorption method, break point chlorination, chemical precipitation method, membrane filter method etc.Although absorption method can remove the ammonia nitrogen of lower concentration, difficulty resolved by sorbent material; Break point chlorination needs expensive oxidizer containing chlorine, and processing cost enterprise is difficult to bear; Membrane filter method treatment effect is good, but invests large, dense water and also need secondary treatment.Chemical precipitation method processing cost is relatively low, and treatment effect is good simultaneously, becomes more competitive treatment process.
Summary of the invention
The present invention is directed to the technical problem existed in above-mentioned prior art, a kind of ammonia nitrogen waste water physico-chemical processes integrated combination treatment unit is provided, for the feature of electroplating wastewater, utilize film-falling absorption tower as stripping tower, the electroplating wastewater continuation applied chemistry precipitator method through stripping remove, and stripping and chemical precipitation method are carried out in same tower.Integrated combination treatment unit of the present invention, not only makes containing the disposable process of high-concentration ammonia nitrogenous wastewater up to standard, and facility compact, and floor space is little, practical.
For achieving the above object, the technical solution adopted in the present invention is as follows:
A kind of ammonia nitrogen waste water physico-chemical processes integrated combination treatment unit, described device, according to the difference of ammonia nitrogen concentration in waste water, forms primarily of one or more the arbitrary combination in stripping module I, circulation blow-removing module II, chemical precipitation medicated module III, tail gas absorption module IV.
Described device adopts film supplying tube as the interface of the gas-to-liquid contact of removal of ammonia and nitrogen.
Described stripping module I adopts blower fan stripping air.
Described circulation blow-removing module II adopts recycle pump circulation nitrogen-containing wastewater.
Described chemical precipitation medicated module III comprises chemical removal groove, and required chemical agent adds entrance by medicament and adds, and forms the precipitation containing ammonia nitrogen, precipitates and discharged by sludge pump.
Described chemical agent, mainly adds the inorganic medicament of calcic phosphorus composition, and the multiple elements design formed containing ammonia nitrogen precipitates, thus realizes the ammonia nitrogen removal to trace.
Stirring system when described chemical precipitation medicated module III adopts blower fan to provide dosing, provides certain stripping function simultaneously.
Described tail gas absorption module IV adopts acidic absorbent to absorb.
The integration that the present invention proposes removes high-concentration ammonia nitrogenous wastewater device, is applicable to industrial enterprise, the wastewater treatment that especially electroplating enterprise ammonia-nitrogen content is high.The ammonia nitrogen of trade effluent especially in electroplating wastewater, because part exists with the form of ammoniacal copper complex ion, wastewater biodegradability is poor simultaneously, causes the ammonia nitrogen of such waste water to be difficult to remove.The present invention is directed to the feature of electroplating wastewater, adopt circulation blow-removing and chemical precipitation method to combine, according to emission request, the collocation between disparate modules can be carried out, if only need the method by strengthening stripping to realize the object of removal of ammonia and nitrogen, then can combine with module I, II, IV and realize; The object being realized ammonia nitrogen removal by dosing is only needed for the former water of the ammonia nitrogen that concentration is lower, then realizes with III, IV combination.For the ammonia nitrogen waste water that concentration is higher, and the ammonia nitrogen containing complex state, then I, II, III, IV block combiner must be adopted to realize.Through different block combiner, the ammonia nitrogen emission request that water outlet can be made to reach " integrated wastewater discharge standard " (GB8978-1996) and " plating pollutant emission standard " (GB21900-2008) specify.
Accompanying drawing explanation
By reading the detailed description done non-limiting example with reference to the following drawings, other features, objects and advantages of the present invention will become more obvious:
Fig. 1 is the composition structural representation of apparatus of the present invention one embodiment.
In figure: 1, opening for feed; 2, offgas outlet; 3, deamination section; 4, tail gas absorber; 5, circulation groove; 6, chemical removal groove; 7, blower fan; 8, recycle pump; 9, sludge pump; 10, sludge outlet; 11, medicament adds entrance; 12, treated water outlet; 13, recycle pump.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in detail.Following examples will contribute to those skilled in the art and understand the present invention further, but not limit the present invention in any form.It should be pointed out that to those skilled in the art, without departing from the inventive concept of the premise, some distortion and improvement can also be made.These all belong to protection scope of the present invention.
Shown in Fig. 1, the combination unit of modularized processing high-concentration ammonia nitrogenous wastewater provided by the invention, comprises stripping module I, circulation blow-removing module II, chemical precipitation medicated module III, tail gas absorption module IV.In order to improve ammonia-nitrogen desorption efficiency, reduce the pressure drop of system, adopt film supplying tube as the gas-liquid two-phase contact interface of deamination section 3 at ammonia nitrogen stripping system.
Film supplying tube deammoniation tower is made up of a series of film supplying tube, is first formed evenly and the liquid film of densification in film supplying tube, ensure that stripping gas fully contacts with the ammonia nitrogen in liquid film containing ammonia nitrogen liquid, avoids packing tower and easily forms channel, shortcoming that pressure drop is large.Film supplying tube deammoniation tower has become first-selected efficient absorption equipment at present, and this tower has the corrosion that higher physical strength bears complicated waste component simultaneously.In processing mode, adopt spray liquid and air from tower top and the mode flowed, thus increase the duration of contact of sample gas and spray liquid, improve removal effect.
The nitrogen-containing wastewater entered from opening for feed 1, after blower fan 7 strippings, if need further stripping, through circulation groove 5, can reach required stripping effect by recycle pump more than 8 circulation.
Through the nitrogen-containing wastewater of stripping, need to reduce ammonia nitrogen concentration further, then can be removed further in chemical removal groove 6 by dosing.Stripping waste water enters in chemical removal groove by overflow, and required chemical agent adds entrance 11 by medicament and adds, and the chemical agent added can be the inorganic components of calcic phosphorus, forms the precipitation containing ammonia nitrogen, thus removes the ammonia nitrogen of trace.Precipitation, eventually through sludge pump 9, is discharged through sludge outlet 10.Process qualified waste water and discharge ammonia nitrogen removal combination unit by treated water outlet 12.
Stripping tail gas is containing gaseous state ammonia nitrogen, and by tail gas absorber 4, recycle pump 13 cyclic absorption, eliminate secondary pollution, final tail gas is discharged by offgas outlet 2.
In order to better the present invention is described, be convenient to understand technical scheme of the present invention, typical but non-limiting embodiment of the present invention is as follows:
Embodiment 1
It is removing of the electroplating wastewater of 200-500mg/L that module I, II, IV combines ammonia nitrogen concentration.This composite module reaches mainly through stripping circulation repeatedly the object removing ammonia nitrogen.Nitrogen-containing wastewater enters combined system by opening for feed 1, and utilize recycle pump 8 constantly to circulate nitrogen-containing wastewater, stripping air is provided by blower fan 7, and stripping tail gas has been come by tail gas absorption module IV.When ammonia nitrogen in waste water reaches required discharge index, then waste water is discharged combined system.The combination of Application Example 1, sees the following form to the waste water circulation removal effect containing ammonia nitrogen concentration being 486mg/L:
| Sequence number | 1 | 2 | 3 | 4 | 5 | 6 |
| Stripping time, min | 0 | 20 | 30 | 60 | 120 | 180 |
| Ammonia nitrogen concentration, mg/L | 486 | 356 | 287 | 189 | 89 | 78 |
From upper table, through block combiner, employing circulation method removes the ammonia nitrogen in waste water, and first 1 hour, removal effect was obvious, when ammonia nitrogen is reduced to 100mg/L, during left and right, ammonia nitrogen removal effect was just not too obvious, eventually through the stripping of 3 hours, ammonia nitrogen in waste water is difficult to reach emission request, needs to be further processed.
Embodiment 2
Module I, II, III, IV combines the high-concentration ammonia nitrogenous wastewater that removal of ammonia and nitrogen concentration is greater than 1000mg/L.For electroplating wastewater, due to the ammoniacal copper complex ion containing complex state, its intractability is difficult to process than common ammonia nitrogen waste water usually, needs the falling liquid film stripping equipment adopting processing efficiency high, needs repeatedly circulation blow-removing simultaneously.On this basis, if wish the ammonia nitrogen qualified discharge of waste water, the method by adding chemical agent is also needed to realize reducing further the object of ammonia nitrogen.What embodiment 2 adopted four modules removes equipment, stripping, circulation blow-removing, chemical dosing, vent gas treatment is combined into one, can realizes ammonia nitrogen in high density process, and can ensure that the ammonia nitrogen in final purification draining meets emission request.4 block combiner devices are shown in Fig. 1.Application four module combination unit removes plating ammonia nitrogen waste water, when containing ammoniacal copper complex ion in waste water, by increasing cycling time, and strengthens the dosage of chemical agent, equally can by wastewater treatment qualified discharge.
Embodiment 3
Ammonia nitrogen concentration is less than to the waste water of 100mg/L, blow-off method is difficult to reach desirable removal effect, general employing chemical precipitation method removal of ammonia and nitrogen waste water, now only needs to adopt chemical precipitation method medicated module III, tail gas absorption module IV can reach the object removing a small amount of ammonia nitrogen.This module provides the stirring system of chemicals dosing plant by blower fan 7, and blower fan 7 has certain stripping function simultaneously, therefore still needs module IV as the absorption equipment of tail gas.If the amount of dosing is enough, the ammonia nitrogen in waste water can be reduced to below 10mg/L.
Above specific embodiments of the invention are described.It is to be appreciated that the present invention is not limited to above-mentioned particular implementation, those skilled in the art can make various distortion or amendment within the scope of the claims, and this does not affect flesh and blood of the present invention.
Claims (8)
1. an ammonia nitrogen waste water physico-chemical processes integrated combination treatment unit, it is characterized in that, described device, according to the difference of ammonia nitrogen concentration in waste water, forms primarily of one or more the arbitrary combination in stripping module, circulation blow-removing module, chemical precipitation medicated module, tail gas absorption module.
2. ammonia nitrogen waste water physico-chemical processes integrated combination treatment unit according to claim 1, is characterized in that, described device adopts film supplying tube as the interface of the gas-to-liquid contact of removal of ammonia and nitrogen.
3. ammonia nitrogen waste water physico-chemical processes integrated combination treatment unit according to claim 1, is characterized in that, described stripping module adopts blower fan stripping air.
4. ammonia nitrogen waste water physico-chemical processes integrated combination treatment unit according to claim 1, it is characterized in that, described circulation blow-removing module II adopts recycle pump circulation nitrogen-containing wastewater.
5. ammonia nitrogen waste water physico-chemical processes integrated combination treatment unit according to claim 1, it is characterized in that, described chemical precipitation medicated module comprises chemical removal groove, and required chemical agent adds entrance by medicament and adds, form the precipitation containing ammonia nitrogen, precipitate and discharged by sludge pump.
6. ammonia nitrogen waste water physico-chemical processes integrated combination treatment unit according to claim 5, it is characterized in that, described chemical agent, mainly add the inorganic medicament of calcic phosphorus composition, the multiple elements design formed containing ammonia nitrogen precipitates, thus realizes the ammonia nitrogen removal to trace.
7. ammonia nitrogen waste water physico-chemical processes integrated combination treatment unit according to claim 5, is characterized in that, described chemical precipitation medicated module employing blower fan provides stirring system during dosing, provides certain stripping function simultaneously.
8. ammonia nitrogen waste water physico-chemical processes integrated combination treatment unit according to claim 1, is characterized in that, described tail gas absorption module adopts acidic absorbent to absorb.
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| CN201410624136.XA CN104355347A (en) | 2014-11-07 | 2014-11-07 | Ammonia-nitrogen wastewater physical-chemical process integrated combined treatment device |
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| CN201410624136.XA CN104355347A (en) | 2014-11-07 | 2014-11-07 | Ammonia-nitrogen wastewater physical-chemical process integrated combined treatment device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105198060A (en) * | 2015-10-27 | 2015-12-30 | 天津惠民达科技发展有限公司 | Low-energy consumption apparatus for removing ammonia nitrogen through chemical precipitation |
| CN113461211A (en) * | 2021-07-13 | 2021-10-01 | 中铝广西有色稀土开发有限公司 | Method for treating rare earth ammonia nitrogen wastewater by combined stripping and chemical method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101555077A (en) * | 2008-04-11 | 2009-10-14 | 中国科学院广州地球化学研究所 | Method for treating highly concentrated ammonian wastewater with poor biodegradability by using a multiple-technique combination |
| CN101665294A (en) * | 2009-06-03 | 2010-03-10 | 长春工程学院 | Method and equipment for carrying out deamination treatment on high-concentration wastewater containing ammonia nitrogen |
| CN102241422A (en) * | 2011-04-22 | 2011-11-16 | 杭州恒易环保科技有限公司 | Circulating closed ammonia nitrogen stripping system |
| CN102502904A (en) * | 2011-12-15 | 2012-06-20 | 汪亮亮 | Efficient falling film denitriding device and denitriding method thereof |
-
2014
- 2014-11-07 CN CN201410624136.XA patent/CN104355347A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101555077A (en) * | 2008-04-11 | 2009-10-14 | 中国科学院广州地球化学研究所 | Method for treating highly concentrated ammonian wastewater with poor biodegradability by using a multiple-technique combination |
| CN101665294A (en) * | 2009-06-03 | 2010-03-10 | 长春工程学院 | Method and equipment for carrying out deamination treatment on high-concentration wastewater containing ammonia nitrogen |
| CN102241422A (en) * | 2011-04-22 | 2011-11-16 | 杭州恒易环保科技有限公司 | Circulating closed ammonia nitrogen stripping system |
| CN102502904A (en) * | 2011-12-15 | 2012-06-20 | 汪亮亮 | Efficient falling film denitriding device and denitriding method thereof |
Non-Patent Citations (1)
| Title |
|---|
| R•L•卡尔普等: "《城市污水高级处理手册》", 31 March 1986 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105198060A (en) * | 2015-10-27 | 2015-12-30 | 天津惠民达科技发展有限公司 | Low-energy consumption apparatus for removing ammonia nitrogen through chemical precipitation |
| CN113461211A (en) * | 2021-07-13 | 2021-10-01 | 中铝广西有色稀土开发有限公司 | Method for treating rare earth ammonia nitrogen wastewater by combined stripping and chemical method |
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Application publication date: 20150218 |