CN103922546A - Heavy metal wastewater treatment equipment and method - Google Patents
Heavy metal wastewater treatment equipment and method Download PDFInfo
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- CN103922546A CN103922546A CN201410179376.3A CN201410179376A CN103922546A CN 103922546 A CN103922546 A CN 103922546A CN 201410179376 A CN201410179376 A CN 201410179376A CN 103922546 A CN103922546 A CN 103922546A
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Abstract
The invention relates to heavy metal wastewater treatment equipment comprising a wastewater regulating tank, a pH regulator, a circulating tank, a membrane filter and a neutralizing tank which are sequentially connected through a pipeline, wherein the wastewater regulating tank is internally provided with an aeration device; the pH regulator comprises at least two pipeline mixers which are sequentially connected through a pipeline; the lower part of the circulating tank is communicated with a sludge collecting tank through a pipeline; the membrane filter is an external or internal tubular membrane assembly made of polyvinylidene fluoride, and a concentrated liquid outlet of the membrane filter is connected with the circulating tank through a pipeline; the neutralizing tank is internally provided with a stirrer, a dosing device and a pH value detecting device. The combined processes of process principles such as coagulation, membrane filtration and the like are integrated in the heavy metal wastewater treatment equipment, processes such as coagulation, sedimentation, sand filtration, activated carbon, ultrafiltration and the like in the traditional wastewater treatment are completely substituted, the technical advantages can be sufficiently exerted, and the technical defects can be avoided, so that the stable and reliable treatment efficiency can be obtained, and the higher standard requirement can be met.
Description
Technical field
The present invention relates to technical field of sewage, especially a kind of heavy metal wastewater treatment apparatus and treatment process.
Background technology
Heavy metal wastewater thereby is mainly derived from smelting and the part chemical enterprise of mechanical workout, mining industry, iron and steel and non-ferrous metal.In the modernized big insutry situation of high concentration, waste water, particularly heavy metal wastewater thereby that industrial production is discharged are day by day serious to the pollution of surrounding environment.Heavy metal in waste water generally can not decompose destruction, can only shift its location and change its Material Form.The pollution of heavy metal is that the trade effluent that contains heavy metal is entered to rivers,lakes and seas, and it will directly have a strong impact on fishery and agricultural generation, be detrimental to health directly or indirectly simultaneously.
The feature of heavy metal contamination shows following several respects: some heavy metal in (1) water body can be converted into the metallic compound that toxicity is stronger under microbial process, if the methylation of mercury is exactly exemplary wherein; (2) the biological heavy metal that absorbs from environment can be through the biological magnification of food chain, in higher organisms body, become thousands of times ground enrichment, then by food, enter human body, in some organ of human body, savings gets up to cause chronic poisoning, is detrimental to health; (3) as long as there is micro heavy can produce toxic effect in natural water body, the general toxigenous scope of heavy metal is greatly between 1-10mg/L, and the stronger metal of toxicity is if the toxigenous mass concentration scopes such as mercury, cadmium are between 0.0l-0.001mg/L.
The pollution of heavy metal causes very large harm sometimes, and for example, the nuisance diseases such as the minamata disease (mercury pollution) that Japan occurs and itai-itai disease (cadmium pollution), are all caused by heavy metal contamination, so should strictly prevent heavy metal contamination.Along with Global Sustainable Development implementation, recycling industries and clean production technology is more and more subject to people and pays close attention to.Heavy metal wastewater thereby is administered from end treatment to integrated control stage developments such as process for cleanly preparing, material cycle utilization, waste water recyclings.Chinese scholars has been done a large amount of research to the governing problem of heavy metal contamination.The method of wastewater treatment of Application and Development mainly contains chemical method, physico-chemical processes and biological process at present, comprises the methods such as chemical precipitation, electrolysis, ion-exchange, membrane sepn, activated carbon and silica gel adsorption, biofloculation, biological adsorption, phytoremediation.For stable, treatment effect good, less investment and operating costs low, be easy to management and operation, do not produce the requirements such as secondary pollution, aforesaid method can't meet the demands completely.Research and development stable, heavy metal containing wastewater treatment technology efficiently be undoubtedly China control heavy metal contamination in the urgent need to.
Summary of the invention
The technical problem to be solved in the present invention is: overcome in prior art in order to make Sewage treatment systems meet steadily in the long term qualified discharge and substantial waste water recycling, a kind of heavy metal wastewater treatment apparatus and treatment process are provided, the techniques such as flocculation, precipitation, sand filtration, gac and ultrafiltration in traditional wastewater treatment have been replaced, system run all right, reliable, treatment effect can meet qualified discharge requirement continuously, and quality of reused water reaches workshop water demand completely.
The technical solution adopted for the present invention to solve the technical problems is: a kind of heavy metal wastewater treatment apparatus, comprise the wastewater equalization pond, pH-meter, circulatory pool, film filter and the neutralization tank that by pipeline, connect successively,
In described wastewater equalization pond, be provided with aerating apparatus, described aerating apparatus comprises high-pressure air source and is built in the aeration tube in wastewater equalization pond, offers several pores on described aeration tube; Wastewater equalization pond receives waste water, plays the effect of even water quality, the water yield, guarantees the continuous, stable, efficient for the treatment of system processing load and treatment effect.
Described pH-meter comprises at least two line mixers that are linked in sequence by pipeline, is connected with respectively chemicals dosing plant on the charging opening of each line mixer, and the pipeline of the exit end of each line mixer is provided with pH proofing unit; Introducing pipeline and dodge mixed technology, waste water is fully mixed with medicament, reach the effects such as the adjusting of pH value, coagulation, is subsequent disposal unit preparatory condition.
The bottom of described circulatory pool is by pipeline connection mud collecting tank, and the pipeline between circulatory pool and film filter is provided with topping-up pump; Circulatory pool coordinates the effect of tackling and discharging mud that reaches with film filter, and certain density mud is drained into mud collecting tank, to carry out subsequent disposal.
Described film filter adopts the external or tube built-in membrane module of polyvinylidene difluoride (PVDF) material, and the dope relief outlet of film filter connects circulatory pool by pipeline; It is separated to there is mud and water at the interception function of membrane module in muddy water, and the clear water after separation enters the neutralization tank of subsequent disposal unit, and the mud dope after being blocked enters circulatory pool.
In described neutralization tank, be provided with agitator, chemicals dosing plant and pH proofing unit.Can directly discharge or enter reclaiming system.
As preferably, the quantity of the line mixer of described pH-meter is three, and the chemicals dosing plant that the first two line mixer connects is alkali lye chemicals dosing plant, and the chemicals dosing plant that a rear line mixer connects is coagulant drug-adding device.Regulate the waste water of pH value under the effect of coagulating agent, adsorb, agglutination reaction, catch fine particle and colloid in waste water, make it to become and separate out greatly, the SS by solid-liquid separation in degrading waste water, COD
crwith heavy metal ion etc.
Further, for discharging the mud accumulating in circulatory pool, the pipeline between described circulatory pool and mud collecting tank is provided with surge pump.Surge pump is difficult for being blocked by mud, easy to use.
Further, for the mud in mud collecting tank is processed, the bottom of described mud collecting tank is connected with sludge dewatering equipment by pipeline, and described mud collecting tank and the pipeline between sludge dewatering equipment are provided with surge pump.Mud after dehydration can carry out follow-up harmless treatment.
For recycle removes the clear water of heavy metal, the outlet of described neutralization tank connects Sewage Reuse System, and described Sewage Reuse System comprises filtration unit and the reverse osmosis membrane filtration device connecting successively by pipeline.
As preferably, described filtration unit comprises two accurate filters of series connection.
As preferably, described reverse osmosis membrane filtration device comprises two reverse osmosis membrane filts of series connection, and the water side of each reverse osmosis membrane filt is connected with water tank.
As preferably, between two described reverse osmosis membrane filts, be provided with accurate filter.
A treatment process that adopts above-mentioned heavy metal wastewater treatment apparatus, has following steps:
1. after heavy metal wastewater thereby being collected, pump into wastewater equalization pond, open aerating apparatus;
2. after aeration is abundant, by topping-up pump, the waste water in wastewater equalization pond is pumped into pH-meter, in the first two line mixer, add alkali lye to regulate pH value, make the pH regulator of waste water to 9-11, in a line mixer, add coagulating agent backward;
3. the waste water that regulates pH is entered in circulatory pool, topping-up pump between ON cycle pond and film filter pumps into waste water in film filter, water after filtration drains in neutralization tank, and by chemicals dosing plant, the water after filtering is adjusted to partial neutral, pH can be set between 6-9, and dope is back in circulatory pool and continues to process;
While 4. accumulating more mud in circulatory pool, the surge pump between ON cycle pond and mud collecting tank pumps into mud in mud collecting tank.
As preferably, the alkali lye of step described in is 2. sodium hydroxide solution, and described coagulating agent is phosphate buffered saline buffer.
The invention has the beneficial effects as follows, the present invention has collected the combination process of the technological principles such as coagulation, membrane filtration, the techniques such as flocculation, precipitation, sand filtration, gac and ultrafiltration in traditional wastewater treatment have been replaced completely, can give full play to the advantage of its technology and keep away its shortcoming, stable to obtain, reliable processing efficiency, and the requirement that meets higher standard.
Its advantage is: treatment effect is stable, meets the emission request of sewage disposal completely; Floor space is little, effectively economizes the land resource; Save construction investment; Reclaiming system reuse just can be discharged or directly be entered to water outlet after regulating pH value; Cleaning interval is long, reduces working cost.
Heavy metal wastewater treatment apparatus of the present invention had both participated in the pre-treatment of waste water, saved the expense that adds of flocculation agent, had save settling tank, flocculation basin, again as the pre-treatment of reclaiming system to wait when needed reuse, saved investment, occupation of land.From sludge treatment angle, the sludge concentration of the mud collecting tank of heavy metal wastewater treatment apparatus can reach 10～20%, has reduced greatly mud concentration time, has improved sludge dewatering efficiency.
By polyvinylidene difluoride (PVDF) membrane separation technique, greatly improved the processing efficiency of film filter, compare with traditional biological treatment, this method have that biochemical efficiency is high, capacity of resisting impact load is strong, effluent quality is good and stable, floor space is little, sludge discharging period is long, easily realize the advantages such as automatic control.Polyvinylidene fluoride film has good surface property, reduces the contamination and plugging of film, and easy to clean, to guarantee treatment effect and the work-ing life of film.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the present invention is further described.
Fig. 1 is the structural representation of first embodiment of heavy metal wastewater treatment apparatus of the present invention.
Fig. 2 is the structural representation of second embodiment of heavy metal wastewater treatment apparatus of the present invention.
In figure: 1. wastewater equalization pond, 2.pH setter, 3. circulatory pool, 4. film filter, 5. neutralization tank, 6. mud collecting tank, 7. sludge dewatering equipment, 8. filtration unit, 9. reverse osmosis membrane filtration device.
Embodiment
In conjunction with the accompanying drawings, the present invention is further detailed explanation.These accompanying drawings are the schematic diagram of simplification, basic structure of the present invention is only described in a schematic way, so it only show the formation relevant with the present invention.
As shown in Figure 1, first embodiment of a kind of heavy metal wastewater treatment apparatus of the present invention, comprises the wastewater equalization pond 1, pH-meter 2, circulatory pool 3, film filter 4 and the neutralization tank 5 that by pipeline, connect successively,
In described wastewater equalization pond 1, be provided with aerating apparatus, described aerating apparatus comprises high-pressure air source and is built in the aeration tube in wastewater equalization pond, offers several pores on described aeration tube; Wastewater equalization pond receives waste water, plays the effect of even water quality, the water yield, guarantees the continuous, stable, efficient for the treatment of system processing load and treatment effect.
Described pH-meter 2 comprises at least two line mixers that are linked in sequence by pipeline, is connected with respectively chemicals dosing plant on the charging opening of each line mixer, and the pipeline of the exit end of each line mixer is provided with pH proofing unit; Introducing pipeline and dodge mixed technology, waste water is fully mixed with medicament, reach the effects such as the adjusting of pH value, coagulation, is subsequent disposal unit preparatory condition.
The bottom of described circulatory pool 3 is by pipeline connection mud collecting tank 6, and the pipeline between circulatory pool 3 and film filter 4 is provided with topping-up pump; Circulatory pool 3 coordinates the effect of tackling and discharging mud that reaches with film filter 4, and certain density mud is drained into mud collecting tank 6, to carry out subsequent disposal.
Described film filter 4 adopts the external or tube built-in membrane module of polyvinylidene difluoride (PVDF) material, and the dope relief outlet of film filter 4 connects circulatory pool 3 by pipeline; It is separated to there is mud and water at the interception function of membrane module in muddy water, and the clear water after separation enters the neutralization tank 5 of subsequent disposal unit, and the mud dope after being blocked enters circulatory pool 3.
In described neutralization tank 5, be provided with agitator, chemicals dosing plant and pH proofing unit.Can directly discharge or enter reclaiming system.
As preferably, the quantity of the line mixer of described pH-meter 2 is three, and the chemicals dosing plant that the first two line mixer connects is alkali lye chemicals dosing plant, and the chemicals dosing plant that a rear line mixer connects is coagulant drug-adding device.Regulate the waste water of pH value under the effect of coagulating agent, adsorb, agglutination reaction, catch fine particle and colloid in waste water, make it to become and separate out greatly, the SS by solid-liquid separation in degrading waste water, COD
crwith heavy metal ion etc.
Further, for discharging the mud of accumulation in circulatory pool 3, described circulatory pool 3 and the pipeline between mud collecting tank 6 are provided with surge pump.Surge pump is difficult for being blocked by mud, easy to use.
A treatment process that adopts above-mentioned heavy metal wastewater treatment apparatus, has following steps:
1. after heavy metal wastewater thereby being collected, pump into wastewater equalization pond 1, open aerating apparatus;
2. after aeration is abundant, by topping-up pump, the waste water in wastewater equalization pond is pumped into pH-meter, in the first two line mixer, add alkali lye to regulate pH value, make the pH regulator of waste water to 9-11, in a line mixer, add coagulating agent backward;
3. the waste water that regulates pH is entered in circulatory pool, topping-up pump between ON cycle pond and film filter pumps into waste water in film filter, water after filtration drains in neutralization tank, and by chemicals dosing plant, the water after filtering is adjusted to partial neutral, pH can be set between 6-9, and dope is back in circulatory pool and continues to process;
While 4. accumulating more mud in circulatory pool, the surge pump between ON cycle pond and mud collecting tank pumps into mud in mud collecting tank.
The alkali lye of step described in is 2. sodium hydroxide solution, and described coagulating agent is phosphate buffered saline buffer.
For the mud in mud collecting tank 6 is processed, the bottom of described mud collecting tank 6 is connected with sludge dewatering equipment 7 by pipeline, and described mud collecting tank 6 and the pipeline between sludge dewatering equipment 7 are provided with surge pump.Mud after dehydration can carry out follow-up harmless treatment.
As described in Figure 2, second embodiment of the present invention, be with the difference of first embodiment: for recycle removes the clear water of heavy metal, the outlet of described neutralization tank 5 connects Sewage Reuse System, and described Sewage Reuse System comprises filtration unit 8 and the reverse osmosis membrane filtration device 9 connecting successively by pipeline.
As preferably, described filtration unit 8 comprises two accurate filters of series connection.
As preferably, described reverse osmosis membrane filtration device 9 comprises two reverse osmosis membrane filts of series connection, and the water side of each reverse osmosis membrane filt is connected with water tank.
As preferably, between two described reverse osmosis membrane filts, be provided with accurate filter.
In order better to implement the present invention, need in the management connecting between each device, the devices such as valve, pressure warning unit be set, but the set-up mode of the devices such as these valves is prior art, and do not limit with accompanying drawing of the present invention in set-up mode.Arrange or few setting, does not affect the operation of equipment more according to actual needs.
The topping-up pump adopting in the present invention can arrange single-stage or bipolar topping-up pump according to actual needs, can have influence on processing efficiency, but does not all affect the operation of equipment.
The above-mentioned foundation desirable embodiment of the present invention of take is enlightenment, and by above-mentioned description, relevant staff can, within not departing from the scope of this invention technological thought, carry out various change and modification completely.The technical scope of this invention is not limited to the content on specification sheets, must determine its technical scope according to claim scope.
Claims (10)
1. a heavy metal wastewater treatment apparatus, is characterized in that: comprise the wastewater equalization pond, pH-meter, circulatory pool, film filter and the neutralization tank that by pipeline, connect successively,
In described wastewater equalization pond, be provided with aerating apparatus, described aerating apparatus comprises high-pressure air source and is built in the aeration tube in wastewater equalization pond, offers several pores on described aeration tube;
Described pH-meter comprises at least two line mixers that are linked in sequence by pipeline, is connected with respectively chemicals dosing plant on the charging opening of each line mixer, and the pipeline of the exit end of each line mixer is provided with pH proofing unit;
The bottom of described circulatory pool is by pipeline connection mud collecting tank, and the pipeline between circulatory pool and film filter is provided with topping-up pump;
Described film filter adopts the external or tube built-in membrane module of polyvinylidene difluoride (PVDF) material, and the dope relief outlet of film filter connects circulatory pool by pipeline;
In described neutralization tank, be provided with agitator, chemicals dosing plant and pH proofing unit.
2. heavy metal wastewater treatment apparatus as claimed in claim 1, it is characterized in that: the quantity of the line mixer of described pH-meter is three, the chemicals dosing plant that the first two line mixer connects is alkali lye chemicals dosing plant, and the chemicals dosing plant that a rear line mixer connects is coagulant drug-adding device.
3. heavy metal wastewater treatment apparatus as claimed in claim 1, is characterized in that: the pipeline between described circulatory pool and mud collecting tank is provided with surge pump.
4. heavy metal wastewater treatment apparatus as claimed in claim 3, is characterized in that: the bottom of described mud collecting tank is connected with sludge dewatering equipment by pipeline, and described mud collecting tank and the pipeline between sludge dewatering equipment are provided with surge pump.
5. heavy metal wastewater treatment apparatus as claimed in claim 1, is characterized in that: the outlet of described neutralization tank connects Sewage Reuse System, and described Sewage Reuse System comprises filtration unit and the reverse osmosis membrane filtration device connecting successively by pipeline.
6. heavy metal wastewater treatment apparatus as claimed in claim 5, is characterized in that: described filtration unit comprises two accurate filters of series connection.
7. heavy metal wastewater treatment apparatus as claimed in claim 5, is characterized in that: described reverse osmosis membrane filtration device comprises two reverse osmosis membrane filts of series connection, and the water side of each reverse osmosis membrane filt is connected with water tank.
8. heavy metal wastewater treatment apparatus as claimed in claim 7, is characterized in that: between two described reverse osmosis membrane filts, be provided with accurate filter.
9. a treatment process for the heavy metal wastewater treatment apparatus of employing as described in claim 1-8 any one, is characterized in that having following steps:
1. after heavy metal wastewater thereby being collected, pump into after wastewater equalization pond, open aerating apparatus;
2. after aeration is abundant, by topping-up pump, the waste water in wastewater equalization pond is pumped into pH-meter, in the first two line mixer, add alkali lye to regulate pH value, make the pH regulator of waste water to 9-11, in a line mixer, add coagulating agent backward;
3. the waste water that regulates pH is entered in circulatory pool, topping-up pump between ON cycle pond and film filter pumps into waste water in film filter, water after filtration drains in neutralization tank, and by chemicals dosing plant, the water after filtering is adjusted to partial neutral, and dope is back in circulatory pool and continues to process;
While 4. accumulating more mud in circulatory pool, the surge pump between ON cycle pond and mud collecting tank pumps into mud in mud collecting tank.
10. treatment process as claimed in claim 9, is characterized in that: the alkali lye of step described in is 2. sodium hydroxide solution, and described coagulating agent is phosphate buffered saline buffer.
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| CN201410179376.3A CN103922546A (en) | 2014-04-29 | 2014-04-29 | Heavy metal wastewater treatment equipment and method |
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| CN105084599A (en) * | 2015-08-28 | 2015-11-25 | 马鞍山市桓泰环保设备有限公司 | Treatment method of treatment device for chromium and nickel-contained liquid waste |
| CN105080946A (en) * | 2015-09-02 | 2015-11-25 | 上海久特环境科技有限公司 | Film separation and concentration system for removing heavy metals in garbage incineration fly ash |
| CN106745519A (en) * | 2016-12-15 | 2017-05-31 | 江门市腾飞科技有限公司 | Heavy metal centralized detecting and the system and its detection method interactive with water purifier in water |
| CN110451724A (en) * | 2019-08-09 | 2019-11-15 | 温州市宏泰市政园林建设有限公司 | A kind of sewage disposal system |
| CN112520918A (en) * | 2020-10-31 | 2021-03-19 | 湖南内特环保科技有限公司 | Filtering membrane system for treating heavy metal wastewater |
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Application publication date: 20140716 |