CN103482810A - Novel system and method for zero emission treatment of high-salinity heavy metal wastewater - Google Patents
Novel system and method for zero emission treatment of high-salinity heavy metal wastewater Download PDFInfo
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- CN103482810A CN103482810A CN201310405559.8A CN201310405559A CN103482810A CN 103482810 A CN103482810 A CN 103482810A CN 201310405559 A CN201310405559 A CN 201310405559A CN 103482810 A CN103482810 A CN 103482810A
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Abstract
The invention belongs to the field of wastewater treatment, and in particular relates to a novel system and method for zero emission treatment of high-salinity heavy metal wastewater. The system comprises a wastewater adjustment and oxidation tank, a wastewater lifting pump, a filter and a spray cooler, wherein a wastewater inlet, an air inlet and a wastewater outlet are formed in the wastewater adjustment and oxidation tank, a high-temperature fume inlet, a low-temperature fume outlet and a wastewater inlet are formed in the spray cooler, the wastewater outlet of the wastewater adjustment and oxidation tank is connected with the inlet of the wastewater lifting pump, the inlet of the filter is connected with the outlet of the wastewater lifting pump, the outlet of the filter is connected with the wastewater inlet of the spray cooler, and an atomization nozzle is arranged in the spray cooler. The system and method disclosed by the invention overcome the defects of large investment and high energy consumption during the conventional treatment process of a conventional method in which a multi-effect evaporator is adopted to perform evaporation, and waste heat and wastewater are utilized to save water, reduce emission, recover valuable heavy metals and reduce solid residues, so that the zero emission treatment of the high-salinity heavy metal wastewater is effectively realized.
Description
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technical field
The present invention relates to a kind of Waste Water Treatment, particularly a kind of zero-discharge treatment system of novel supersalinity heavy metal wastewater thereby and method.
Background technology
In order to implement the industry policy of national recycling economy, the waste residues such as flue dust of copper smelting plant output need comprehensive utilization, reclaim valuable metal, turn waste into wealth.
The waste residues such as copper fumes that copper smelting plant produces are pressed into the pelletizing with higher-strength after mix, be added to again in smelting furnace and carry out melting extraction valuable metal, in the process of above-mentioned recovery valuable metal, discharge the flue gas containing a large amount of sulfurous gas and heavy metal flue dust, this burst of flue-gas temperature, up to 1200 ℃, need to be cooled and dedusting.Usually after adopting the techniques such as chuck water-cooled flue, air heat-exchange to be lowered the temperature, gather dust and collect the flue dust in flue gas by dry method, then, by wet scrubbing, remove the pollutents such as sulfurous gas in flue gas, the flue gas up to standard after washing is discharged from chimney.The characteristics of this technique maximum are to produce a large amount of waste water, and these waste water contain the compositions such as a large amount of heavy metals and S-WAT.
At present, environmental requirement is more and more higher, and particularly, under the strictest environmental requirement, any factory effluent must not efflux, and needs fully recovering.Under the prerequisite that does not also allow factory effluent to efflux after the heavy metal processing is up to standard, in view of this burst of waste water saltiness is high and the heavy metal severe overweight, if this strand of waste water by heavy metal process up to standard after cyclically utilizing ceaselessly again, certainly will cause the saltiness saturated crystallization in certain water circulation system, thereby have influence on the normal operation of production system.For whole production technique can normally be moved, the salt in waste water can only pass through the form of solid salt as open circuit.Conventional processing technological flow is shown in accompanying drawing 1, the waste water of supersalinity and heavy metal severe overweight enters that waste water is regulated and after oxidation pond is oxidized to sodium sulfate by S-WAT, by after the supercharging of waste water lifting pump, delivering to reactive tank, in reactive tank, add heavy metal chelating agent that the heavy metal chelating in waste water is become to flocculent precipitate; Flocculent precipitate to flocculation tank, adds flocculation agent with the waste water run by gravity in flocculation tank again, and tiny flocculent precipitate is condensed into to large all flowers; Enter concentration basin containing all flowers of heavy metal with the waste water run by gravity, be precipitated to the bottom of concentration basin, then be delivered to dehydration equipment by topping-up pump and dewatered, returning to again the technique smelting furnace containing the dry slag of heavy metal and carry out heavy metal and refine again recovery after dehydration; Waste water after removal heavy metal also contains dense sodium sulfate, by the waste water transferpump, it is delivered to the further desalination of vaporizer, and the salt in waste water is transported outward after by evaporative crystallization, and the moisture content in waste water is cooling recycling again after high temperature evaporation.The technique that this employing multiple-effect evaporator is processed, although environment protecting is better, need to consume a large amount of steam or electric energy, and investment and running cost are high, deficiency in economic performance.
Summary of the invention
For addressing the above problem, the object of the present invention is to provide a kind of zero-discharge treatment system and method for novel supersalinity heavy metal wastewater thereby, this treatment process can effectively be utilized fume afterheat, accomplish water reuse, save new water consumption, do not need to arrange reactive tank, heavy metal slag dehydration equipment and multiple-effect evaporator, running cost only have conventional treatment process 5% less than.
The present invention is achieved through the following technical solutions:
A kind of zero-discharge treatment system of novel supersalinity heavy metal wastewater thereby, it is characterized in that, comprise waste water adjusting and oxidation pond, the waste water lifting pump, strainer, spray cooler, on described waste water adjusting and oxidation pond, waterwater entrance is arranged, gas inlet and wastewater outlet, spray cooler is provided with high-temperature flue gas entry, the low-temperature flue gas outlet, waterwater entrance, wastewater outlet on described waste water adjusting and oxidation pond is connected with the entrance of waste water lifting pump, the entrance of described strainer is connected with the waste water lifting pump outlet, filter outlet is connected with the waterwater entrance of spray cooler, be provided with atomizer in described spray cooler.
Further, described spray cooler is tower structure or horizontal type structure.
The present invention also provides a kind of zero-discharge treatment system of novel supersalinity heavy metal wastewater thereby to process the method for waste water simultaneously, it is characterized in that, comprises the following steps:
(1) high saliferous heavy metal wastewater thereby enters waste water adjusting and oxidation pond, and under air effect, in waste water, S-WAT is oxidized to sodium sulfate;
(2) waste water after process (1) is filtered after the supercharging of waste water lifting pump again;
(3) utilize the atomizer of spray cooler will the waste water spirt high-temperature flue gas after process (2) in, the sodium sulfate salt in waste water and heavy metal at high temperature drying enter in flue dust, water forms water smoke and adiabatic evaporation enters flue gas.
The present invention compared with prior art has the following advantages and beneficial effect:
The present invention meets the requirement of environmental protection to the factory effluent zero release, has overcome the shortcoming that in the conventional processing flow process that adopts multiple-effect evaporator to be evaporated, investment is large, energy consumption is high, has the following advantages:
(1) the flue gas during smelting temperature requirement is reduced to 200 ° of C by 1200 ° of C, can utilize this strand of waste water to carry out spray cooling, saves new water consumption; After the valuable metal drying in waste water, entering into flue dust can return to the technique smelting furnace and reclaimed simultaneously again;
(2) cost for wastewater treatment is very low, not as good as 5% of conventional treatment process, does not need multiple-effect evaporator is set separately, reduces investment outlay, and has huge economic benefit.
(3) adopt used heat utilization, water reuse, accomplish water-saving and emission-reducing, have the valency heavy metal to reclaim, reduce the solid quantity of slag and meet the strict multipurposes such as environmental requirement, there is far-reaching economy and social benefit.
The accompanying drawing explanation
The zero release conventional treatment process schema that Fig. 1 is a kind of supersalinity heavy metal wastewater thereby;
The zero-discharge treatment system technical process that Fig. 2 is a kind of novel supersalinity heavy metal wastewater thereby of the present invention;
The Zero-discharge treating process structural representation that Fig. 3 is a kind of novel supersalinity heavy metal wastewater thereby of the present invention;
1, waste water is regulated and oxidation pond, and 2, lift pump, 3, strainer, 4, spray cooler, 5, atomizer.
Embodiment
Below in conjunction with drawings and Examples, the present invention is further illustrated:
A kind of zero-discharge treatment system of novel supersalinity heavy metal wastewater thereby, comprise waste water adjusting and oxidation pond 1, waste water lifting pump 2, strainer 3, spray cooler 4, on described waste water adjusting and oxidation pond 1, waterwater entrance is arranged, gas inlet and wastewater outlet, spray cooler 4 is provided with high-temperature flue gas entry, the low-temperature flue gas outlet, waterwater entrance, wastewater outlet on described waste water adjusting and oxidation pond 1 is connected with the entrance of waste water lifting pump 2, the entrance of described strainer 3 is connected with the outlet of waste water lifting pump 2, strainer 3 outlets are connected with the waterwater entrance of spray cooler 4, be provided with atomizer 5 in described spray cooler 4.The waste water of supersalinity and heavy metal severe overweight enters that waste water is regulated and after oxidation pond 1 is oxidized to sodium sulfate by S-WAT, by filtering through strainer 3 again after 2 superchargings of waste water lifting pump, finally utilize the atomizer 5 of spray cooler 4 by waste water spirt high-temperature flue gas, salt in waste water and heavy metal at high temperature drying enter in flue dust, water forms water smoke and adiabatic evaporation enters flue gas, greatly reduce flue-gas temperature, the flue gas after cooling enters in subsequent processing and processes again simultaneously.
Embodiment 1:
The wastewater flow rate that certain project spray alkali liquid washing gets off: 48.0m
3/ d, major ingredient is as follows:
| Composition | Na 2SO 3 | Na 2SO 4 | Cu | Bi | Pb | Sn | Zn | Cd |
| kg/d | 11341.4 | 130.0 | 52.501 | 5.448 | 11.415 | 0.404 | 0.769 | 1.566 |
| mg/L | 257758.9 | 2954.5 | 1193.2 | 123.8 | 259.4 | 9.2 | 17.5 | 35.6 |
This supersalinity heavy metal wastewater thereby adopts accompanying drawing 2 technical process to carry out zero discharge treatment, comprises 24m
3waste water adjusting and oxidation pond, waste water lifting pump (Q=2m
3/ h, H=30m), filtration capacity is Q=2m
3the strainer of/h and spray cooler, the waste water of supersalinity and heavy metal severe overweight enters that waste water is regulated and after oxidation pond is oxidized to sodium sulfate by S-WAT, by filtering through strainer again after the supercharging of waste water lifting pump, finally utilize the atomizer of spray cooler by waste water spirt high-temperature flue gas, sodium sulfate salt in waste water and heavy metal at high temperature drying enter in flue dust, water forms water smoke and adiabatic evaporation enters flue gas, greatly reduce flue-gas temperature, the flue gas after cooling enters in subsequent processing and processes again simultaneously.
As adopt the conventional treatment process as shown in accompanying drawing 1, the current consumption that wherein multiple-effect evaporator is processed water per ton is about 20 degree, commercial power is by the words of 0.7 yuan/degree, the cost that multiple-effect evaporator is processed is approximately 14 yuan/tons of water, the electric cost total of the equipment such as other oxidation pond and reactive tank is approximately 1 yuan/ton of water, medicament expense is approximately 5 yuan/tons of water, and the processing cost of conventional waste water treatment process is approximately 20 yuan/tons of water.
Be the used heat utilization and adopt the main characteristics for the treatment of process of invention, utilize process high-temperature used heat to be processed, do not need to add again in addition treatment agent.Its processing cost only has the electric cost of the equipment such as oxidation pond and strainer, waste water lifting pump, is approximately 1 yuan/ton of water.The conventional treatment process one-time investment is high in addition, and a cost of investment of the present invention is little, so cost for wastewater treatment of the present invention is very low, not as good as 5% of conventional treatment process.
Above content is in conjunction with concrete preferred implementation further description made for the present invention, can not assert that specific embodiment of the invention is confined to these explanations.For the general technical staff of the technical field of the invention; make without departing from the inventive concept of the premise some alternative or obvious modification that are equal to; and performance or purposes identical, should be considered as belonging to the definite protection domain of claims that the present invention submits to.
Claims (3)
1. the zero-discharge treatment system of a novel supersalinity heavy metal wastewater thereby, it is characterized in that, comprise waste water adjusting and oxidation pond, the waste water lifting pump, strainer, spray cooler, on described waste water adjusting and oxidation pond, waterwater entrance is arranged, gas inlet and wastewater outlet, spray cooler is provided with high-temperature flue gas entry, the low-temperature flue gas outlet, waterwater entrance, wastewater outlet on described waste water adjusting and oxidation pond is connected with the entrance of waste water lifting pump, the entrance of described strainer is connected with the waste water lifting pump outlet, filter outlet is connected with the waterwater entrance of spray cooler, be provided with atomizer in described spray cooler.
2. the zero-discharge treatment system of a kind of novel supersalinity heavy metal wastewater thereby according to claim 1, is characterized in that, described spray cooler is tower structure or horizontal type structure.
3. a method of utilizing the zero-discharge treatment system processing waste water of the described novel supersalinity heavy metal wastewater thereby of arbitrary claim in claim 1-2, is characterized in that, comprises the following steps:
High saliferous heavy metal wastewater thereby enters waste water and regulates and oxidation pond, and under air effect, in waste water, S-WAT is oxidized to sodium sulfate;
Waste water after step (1) is processed is filtered after the supercharging of waste water lifting pump again;
Utilize the atomizer of spray cooler will the waste water spirt high-temperature flue gas after step (2) is processed in, the sodium sulfate salt in waste water and heavy metal at high temperature drying enter in flue dust, water forms water smoke and adiabatic evaporation enters flue gas.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104569017A (en) * | 2014-12-31 | 2015-04-29 | 聚光科技(杭州)股份有限公司 | Detection device for heavy metal in water and work method of detection device |
| CN106890554A (en) * | 2017-03-24 | 2017-06-27 | 安徽宣城金宏化工有限公司 | The handling process and equipment of acid Process Gas during a kind of carbon disulphide production |
| CN112295385A (en) * | 2019-07-30 | 2021-02-02 | 中冶长天国际工程有限责任公司 | Tail gas purification and waste heat utilization method and device of hot blast stove for active carbon desorption |
| CN114455656A (en) * | 2022-01-27 | 2022-05-10 | 大冶有色金属有限责任公司 | Method for treating copper-containing wastewater by using waste heat of anode furnace |
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| CN2625018Y (en) * | 2003-02-28 | 2004-07-14 | 无锡华润制钢有限公司 | Spray cooling tower |
| KR100824290B1 (en) * | 2007-10-18 | 2008-04-22 | 정윤기 | A processing apparatus for wastewater treatment |
| CN101417828A (en) * | 2007-10-26 | 2009-04-29 | 余乐 | Method and system for processing desulphurization waste water |
| CN203530069U (en) * | 2013-09-09 | 2014-04-09 | 中国瑞林工程技术有限公司 | Novel zero discharge treatment system for high-salinity heavy metal wastewater |
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2013
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2625018Y (en) * | 2003-02-28 | 2004-07-14 | 无锡华润制钢有限公司 | Spray cooling tower |
| KR100824290B1 (en) * | 2007-10-18 | 2008-04-22 | 정윤기 | A processing apparatus for wastewater treatment |
| CN101417828A (en) * | 2007-10-26 | 2009-04-29 | 余乐 | Method and system for processing desulphurization waste water |
| CN203530069U (en) * | 2013-09-09 | 2014-04-09 | 中国瑞林工程技术有限公司 | Novel zero discharge treatment system for high-salinity heavy metal wastewater |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104569017A (en) * | 2014-12-31 | 2015-04-29 | 聚光科技(杭州)股份有限公司 | Detection device for heavy metal in water and work method of detection device |
| CN104569017B (en) * | 2014-12-31 | 2017-05-31 | 聚光科技(杭州)股份有限公司 | Heavy metal analysis device and its method of work in water |
| CN106890554A (en) * | 2017-03-24 | 2017-06-27 | 安徽宣城金宏化工有限公司 | The handling process and equipment of acid Process Gas during a kind of carbon disulphide production |
| CN112295385A (en) * | 2019-07-30 | 2021-02-02 | 中冶长天国际工程有限责任公司 | Tail gas purification and waste heat utilization method and device of hot blast stove for active carbon desorption |
| CN114455656A (en) * | 2022-01-27 | 2022-05-10 | 大冶有色金属有限责任公司 | Method for treating copper-containing wastewater by using waste heat of anode furnace |
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Address after: 330031 No. 888, Qian Hu Road, Hongjiao Island, Nanchang, Jiangxi. Patentee after: China ruim engineering technology Limited by Share Ltd Address before: 330063 No. 888, Qian Hu Road, Hongjiao Island, Nanchang, Jiangxi. Patentee before: China Nerin Engineering Co., Ltd. |