CN104086054A - Method for treating heavy metal wastewater by adopting chemical precipitation-flocculation-phytoremediation process - Google Patents
Method for treating heavy metal wastewater by adopting chemical precipitation-flocculation-phytoremediation process Download PDFInfo
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Abstract
The invention discloses a method for treating heavy metal wastewater by adopting a chemical precipitation-flocculation-phytoremediation process. The method for treating the heavy metal wastewater by adopting the chemical precipitation-flocculation-phytoremediation process comprises the following steps: (1) settling, wherein heavy metal wastewater freely settles in a settling tank to remove large-particulate matters; (2) chemical precipitation: feeding the treated wastewater into a storage tank, firstly adding lime water to regulate the pH value of wastewater to 7-9, then adding a chemical agent, and uniformly stirring to form precipitates; (3) flocculating: feeding solids and liquid generated after precipitation into a separation tank under the stirring condition, adding a flocculating agent, standing, and then carrying out solid-liquid separation; (4) recycling heavy metals; (5) recycling water: wherein a part of aqueous solution returns back to an industrial system to be recycled and the other part of aqueous solution enters into a landscape treatment system by adopting a phytoemediation method. The method has the advantages that the chemical precipitation-flocculation-phytoremediation process is adopted for treating the heavy metal wastewater, multiple heavy metal ions in wastewater can be removed at the same time, treatment speed is high, heavy metal ion removal rate is high, and the treated heavy metal and the treated water can be recycled, so that water pollution input cost is reduced, and recycling of resources is also realized.
Description
Technical field
The present invention relates to technical field of waste water processing, relate in particular to the method for a kind of chemical precipitation-flocculation-phytoremediation processing heavy metal wastewater thereby.
Background technology
Water is the important component part of human ecology, has play a part important in origin of life and evolutionary process.Along with industrial, agriculture fast development, environmental pollution is also further serious, and water pollution is serious, and the hazardous and noxious substances entering in water gets more and more.The mankind's industrial development is very huge to the infringement of water body, the heavy metal contamination that particularly industry such as mining, metallurgy, chemical industry, plating and electronic industry causes water body.From environmental pollution aspect, heavy metal mainly refers to the significant heavy metal elements of toxicity such as mercury (Hg), cadmium (Cd), plumbous (Pb), chromium (Cr), also refer to have the general heavy metal of certain toxicity, as zinc (Zn), copper (Cu), cobalt (Co), nickel (Ni) etc.Heavy metal containing sewage can produce a large amount of harm to HUMAN HEALTH and physical environment.The maximum feature of heavy metal contamination is that the heavy metal in sewage can not be degraded in environment, can only be moved, and the excessive enrichment meeting of metal in food chain causes very large harm to physical environment and HUMAN HEALTH.Effectively process excessive heavy metal in water body, can effectively reduce the content of various animals and plants heavy metal of body in food chain, thereby alleviate the harm to the mankind.
At present, heavy metal in waste water treatment process has method of chemical treatment (comprising chemical precipitation method, oxidation reduction process and electrolytic process), physical treatment process (comprising absorption method, ion exchange method and membrane separation process), biological treatment (comprising biosorption process, bio-flocculation process and phytoremediation).
Chemical precipitation method comprises neutralization precipitation method, the ferrite precipitator method, sulphide precipitation, the barium salt precipitator method, the starch xanthate precipitator method.Wherein the ferrite precipitator method are more novel technology, and this method, simultaneously to contents of many kinds of heavy metal ion generation effect, is specially adapted to the trade effluent containing contents of many kinds of heavy metal ion.Oxidation reduction process is to add reductive agent under acidic conditions, then reppd method, the recovery of copper and mercury can profit in this way, this method is also usually used in the processing of chromate waste water, the normal reductive agent using has ferrous sulfate, sodium bisulfite, iron powder etc.Electrolytic process is to make heavy metal ions in wastewater that oxidation and reduction reaction occur respectively on sun-cloudy the two poles of the earth by electrolysis to make heavy metal accumulation, according to anode type difference, electrolytic process is divided into electrowinning method and reclaims heavy metal electrolytic process two classes.
Physisorphtion is, by the fluffy structure of the high-specific surface area of sorbing material or specific function group, heavy metal ion in water is carried out to physical adsorption, and conventional sorbent material has gac, zeolite, rectorite leng, diatomite, frog stone, phosphatic rock etc.Ion exchange method is to carry out chelating, permutoid reaction by the amino in resin, hydroxyl isoreactivity group and heavy metal ion, thereby the method for removing heavy metal ions in wastewater, conventional ion exchange resin has Zeo-karb, anionite-exchange resin and resin.Membrane separation process is a kind of emerging isolation technique, and common membrane sepn process is divided into micro-filtration, ultrafiltration, nanofiltration, reverse osmosis, electrodialysis etc.
Biosorption process is to utilize the chemical structure of organism itself and composition characteristic to adsorb heavy metal ion soluble in water, then is separated and is removed the method for the heavy metal ion in the aqueous solution by solid-liquid two.Bio-flocculation process is to utilize the metabolite of microorganism or microorganisms to precipitate, because most microorganisms have certain linear structure, some surfaces have higher charge or stronger wetting ability, can combine by various effects with particle, play good flocculating effect.Phytoremediation is the one extension that biological process is processed heavy metal industrial effluent, refer to by botanical system and root system thereof remove, volatilize or stable water body environment in heavy metal contaminants, or heavy metal toxicity in reduction pollutent, remove the object of polluting, repairing or administer water body, the vegetables oil algae that can utilize, herbaceous plant, xylophyta etc. to reach in phytoremediation.
Method used has relative merits separately at present, and many times, single method is difficult to obtain good effect, need to use several different methods could reach faster and better the object of administering heavy metal wastewater thereby simultaneously.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, provide a kind of chemical precipitation-flocculation-phytoremediation to process the method for heavy metal wastewater thereby, simple to operate, processing speed is fast, availablely removes contents of many kinds of heavy metal ion in waste water simultaneously, and removal of heavy metal ions rate is high, and heavy metal after wastewater treatment can be with reclaiming, water is reuse again, has not only reduced water and has polluted input cost, has also realized the cyclic regeneration of resource.
The present invention adopts following technical scheme to achieve these goals:
Chemical precipitation-flocculation-phytoremediation is processed a method for heavy metal wastewater thereby, and the method comprises the following steps:
(1) sedimentation: heavy metal wastewater thereby is removed organic and inorganic large particulate matter by natural subsidence in settling bowl;
(2) chemical precipitation: step (1) waste water after treatment enters into storage pool, first adds liming, and adjusting waste water ph is 7-9, then adds chemical agent and stirs, makes heavy metal ion react with chemical agent and forms precipitation;
(3) flocculation: the solid-liquid that step (2) is formed after precipitation enters separate tank under whipped state, adds flocculation agent, carries out solid-liquid separation after leaving standstill and obtains the aqueous solution and heavy metal precipitation thing;
(4) heavy metal reclaims: heavy metal precipitation thing is recycled;
(5) water reuse: the aqueous solution part after separation reenters industrial system reuse, another part can enter view treatment system with phytoremediation.
Described heavy metal wastewater thereby has iron for containing, zinc, copper, lead, nickel, manganese, mercury, and when content is 20-40mg/L, the kind of the chemical agent described in step (2) and addition are that waste water per ton adds nine water cure sodium 0.3-0.5kg, ten phosphate dihydrate sodium 0.3-0.5kg, polyacrylamide 3-7g.
Described heavy metal wastewater thereby is for containing iron, zinc, copper, lead, nickel, manganese, mercury, and content is 20-40mg/L, while containing chromium ion 30-50mg/L simultaneously, the kind of the chemical agent described in step (2) and addition are that waste water per ton adds iron vitriol 0.5-1.0kg, nine water cure sodium 0.3-0.5kg, ten phosphate dihydrate sodium 0.3-0.5kg, polyacrylamide 3-7g.
Compared with the prior art, beneficial effect of the present invention is as follows:
The present invention adopts chemical precipitation-flocculation-phytoremediation to process successively heavy metal wastewater thereby, can remove contents of many kinds of heavy metal ion in waste water simultaneously, in heavy metal wastewater thereby, add chemical agent, heavy metal ion is formed heavy, disposable removal contents of many kinds of heavy metal ion, comprises heavy metal chromium, then make heavy formation cluster and separate by flocculence, heavy metal after separation can be recycled, and the water part after separation is as industrial reuse, and another part is processed as view by phytoremediation.The present invention is simple to operate, processing speed is fast, availablely remove contents of many kinds of heavy metal ion in waste water simultaneously, removal of heavy metal ions rate is high, and removal of heavy metal ions rate reaches more than 95%, and chromium ion clearance reaches more than 90%, and heavy metal after wastewater treatment can reclaim, water is reuse again, and the water that has not only reduced enterprise pollutes input cost, has also realized the cyclic regeneration of resource.
Brief description of the drawings
Fig. 1 is process flow sheet of the present invention.
Embodiment
Below in conjunction with embodiment, the present invention is further illustrated, but the present invention is not limited only to these embodiment, under the prerequisite that does not depart from aim of the present invention, within any improvement of doing all drops on protection scope of the present invention.
Embodiment 1:
A method for heavy metal wastewater thereby is processed in chemical precipitation-flocculation-phytoremediation, and described heavy metal wastewater thereby has iron for containing, zinc, copper, lead, nickel, manganese, mercury, and content is 30mg/L, and the method comprises the following steps:
(1) sedimentation: heavy metal wastewater thereby is removed organic and inorganic large particulate matter by natural subsidence in settling bowl;
(2) chemical precipitation: step (1) waste water after treatment enters into storage pool, first add liming, regulating waste water ph is 9, then waste water per ton adds nine water cure sodium 0.4kg, ten phosphate dihydrate sodium 0.5kg, polyacrylamide 5g, then stir, metal ion is reacted with chemical agent and form precipitation;
(3) flocculation: the solid-liquid that step (2) is formed after precipitation enters separate tank under whipped state, adds flocculation agent, carries out solid-liquid separation after leaving standstill and obtains the aqueous solution and heavy metal precipitation thing;
(4) heavy metal reclaims: heavy metal precipitation thing is recycled;
(5) water reuse: the aqueous solution part after separation reenters industrial system reuse, another part can enter view treatment system with phytoremediation.
After the present embodiment wastewater treatment, removal of heavy metal ions rate reaches 99%.
Embodiment 2:
A kind of chemical precipitation-flocculation-phytoremediation is processed the method for heavy metal wastewater thereby, described heavy metal wastewater thereby is for containing iron, zinc, copper, lead, nickel, manganese, mercury, and content is 20-40mg/L, contains chromium ion 30-50mg/L simultaneously, and the method comprises the following steps:
(1) sedimentation: heavy metal wastewater thereby is removed organic and inorganic large particulate matter by natural subsidence in settling bowl;
(2) chemical precipitation: step (1) waste water after treatment enters into storage pool, first add liming, regulating waste water ph is 8, then waste water per ton adds iron vitriol 0.8kg, nine water cure sodium 0.5kg, ten phosphate dihydrate sodium 0.3kg, polyacrylamide 6g, and stir, metal ion is reacted with chemical agent and form precipitation;
(3) flocculation: the solid-liquid that step (2) is formed after precipitation enters separate tank under whipped state, adds flocculation agent, carries out solid-liquid separation after leaving standstill and obtains the aqueous solution and heavy metal precipitation thing;
(4) heavy metal reclaims: heavy metal precipitation thing is recycled;
(5) water reuse: the aqueous solution part after separation reenters industrial system reuse, another part can enter view treatment system with phytoremediation.
After the present embodiment wastewater treatment, removal of heavy metal ions rate reaches 98%, and wherein chromium ion clearance reaches 95%.
Claims (3)
1. chemical precipitation-flocculation-phytoremediation is processed a method for heavy metal wastewater thereby, it is characterized in that: the method comprises the following steps:
(1) sedimentation: heavy metal wastewater thereby is removed organic and inorganic large particulate matter by natural subsidence in settling bowl;
(2) chemical precipitation: step (1) waste water after treatment enters into storage pool, first adds liming, and adjusting waste water ph is 7-9, then adds chemical agent and stirs, makes heavy metal ion react with chemical agent and forms precipitation;
(3) flocculation: the solid-liquid that step (2) is formed after precipitation enters separate tank under whipped state, adds flocculation agent, carries out solid-liquid separation after leaving standstill and obtains the aqueous solution and heavy metal precipitation thing;
(4) heavy metal reclaims: heavy metal precipitation thing is recycled;
(5) water reuse: the aqueous solution part after separation reenters industrial system reuse, another part can enter view treatment system with phytoremediation.
2. chemical precipitation-flocculation according to claim 1-phytoremediation is processed the method for heavy metal wastewater thereby, it is characterized in that: described heavy metal wastewater thereby has iron for containing, zinc, copper, lead, nickel, manganese, mercury, and when content is 20-40mg/L, the kind of the chemical agent described in step (2) and addition are that waste water per ton adds nine water cure sodium 0.3-0.5kg, ten phosphate dihydrate sodium 0.3-0.5kg, polyacrylamide 3-7g.
3. chemical precipitation-flocculation according to claim 1-phytoremediation is processed the method for heavy metal wastewater thereby, it is characterized in that: described heavy metal wastewater thereby is for containing iron, zinc, copper, lead, nickel, manganese, mercury, and content is 20-40mg/L, while containing chromium ion 30-50mg/L simultaneously, the kind of the chemical agent described in step (2) and addition are that waste water per ton adds iron vitriol 0.5-1.0kg, nine water cure sodium 0.3-0.5kg, ten phosphate dihydrate sodium 0.3-0.5kg, polyacrylamide 3-7g.
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| CN105084603A (en) * | 2015-09-09 | 2015-11-25 | 杭州太一科技有限公司 | Treatment method and system of nickel-containing wastewater conforming to Water Pollutant Table III Discharge Standard |
| CN106045118A (en) * | 2016-07-09 | 2016-10-26 | 台州市神州电热电器厂 | Static and dynamic combined type chemical precipitation system and method for electroplating comprehensive wastewater |
| CN106277354A (en) * | 2016-08-26 | 2017-01-04 | 夏百庆 | A kind of duplicate removal metal water quality renovation agent |
| TWI588223B (en) * | 2016-02-19 | 2017-06-21 | 遠東科技大學 | Preparation method of electromagnetic shielding materials using recycled materials |
| CN108554162A (en) * | 2018-04-24 | 2018-09-21 | 张燕 | A kind of process for producing a variety of biological deodorants using Domestic Waste Leachate |
| CN109374880A (en) * | 2018-09-30 | 2019-02-22 | 广西驰胜农业科技有限公司 | A kind of accurate detection method of tealeaves content of beary metal |
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| CN105084603A (en) * | 2015-09-09 | 2015-11-25 | 杭州太一科技有限公司 | Treatment method and system of nickel-containing wastewater conforming to Water Pollutant Table III Discharge Standard |
| TWI588223B (en) * | 2016-02-19 | 2017-06-21 | 遠東科技大學 | Preparation method of electromagnetic shielding materials using recycled materials |
| CN106045118A (en) * | 2016-07-09 | 2016-10-26 | 台州市神州电热电器厂 | Static and dynamic combined type chemical precipitation system and method for electroplating comprehensive wastewater |
| CN106277354A (en) * | 2016-08-26 | 2017-01-04 | 夏百庆 | A kind of duplicate removal metal water quality renovation agent |
| CN108554162A (en) * | 2018-04-24 | 2018-09-21 | 张燕 | A kind of process for producing a variety of biological deodorants using Domestic Waste Leachate |
| CN109374880A (en) * | 2018-09-30 | 2019-02-22 | 广西驰胜农业科技有限公司 | A kind of accurate detection method of tealeaves content of beary metal |
| CN109928553A (en) * | 2019-03-21 | 2019-06-25 | 广东工业大学 | A kind of chemical nickel plating waste solution processing unit and method |
| CN110656902A (en) * | 2019-10-21 | 2020-01-07 | 延安能源化工（集团）有限责任公司 | Drilling fluid waste treatment process and drilling fluid waste treatment device |
| CN111039450A (en) * | 2019-12-16 | 2020-04-21 | 北京协同创新研究院 | Integrated runner heavy metal removal system and sewage treatment method |
| CN111304703A (en) * | 2020-03-11 | 2020-06-19 | 吕文广 | Method for removing sulfate radical in high-quality surface treatment material |
| CN112062411A (en) * | 2020-09-11 | 2020-12-11 | 深圳市粤昆仑环保实业有限公司 | Electroplating sewage treatment method |
| CN113429020A (en) * | 2021-06-29 | 2021-09-24 | 上海应用技术大学 | Method for removing heavy metal ions in acidic wastewater |
| CN116803931A (en) * | 2023-08-15 | 2023-09-26 | 连云港绿润环保科技有限公司 | Recovery system and method for waste alkali liquor containing heavy metals |
| CN116803931B (en) * | 2023-08-15 | 2024-03-08 | 连云港绿润环保科技有限公司 | Recovery system and method for waste alkali liquor containing heavy metals |
| CN118125582A (en) * | 2024-05-06 | 2024-06-04 | 成都师范学院 | Sewage treatment method |
| CN118125582B (en) * | 2024-05-06 | 2024-07-05 | 成都师范学院 | Sewage treatment method |
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