CN105000752A - Treatment method of heavy metal wastewater - Google Patents
Treatment method of heavy metal wastewater Download PDFInfo
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- CN105000752A CN105000752A CN201510391124.1A CN201510391124A CN105000752A CN 105000752 A CN105000752 A CN 105000752A CN 201510391124 A CN201510391124 A CN 201510391124A CN 105000752 A CN105000752 A CN 105000752A
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- heavy metal
- metal wastewater
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Abstract
The invention provides a treatment method of heavy metal wastewater. The treatment method comprises the following steps: Step 1, introducing heavy metal wastewater into a precipitation basin, introducing air into heavy metal wastewater and stirring heavy metal wastewater, and adding NaOH during introduction of air and stirring such that pH of heavy metal wastewater is 8-8.5, Cu<2+> in heavy metal wastewater is converted to Cu(OH)2 precipitation particles and Cr<3+> is converted to Cr(OH)3 precipitation particles; and adding NaOH while introducing air and stirring such that pH of heavy metal wastewater is 9.5-9.8 and Ni<2+> in heavy metal wastewater is converted to Ni(OH)2 precipitation particles; and Step 2, introducing heavy metal wastewater into a separation tank, filtering heavy metal wastewater by a PVDF immersed membrane bioreactor installed inside the separation tank to obtain a filtrate, and pumping away the filtrate by a magnetic drive pump. According to the treatment method of heavy metal wastewater, a chemical precipitation method is adopted. Precipitation velocity is fast, and separation is thorough. Heavy metal is recovered through a pressure pipe after precipitation.
Description
Technical field
The present invention relates to the treatment process of heavy metal wastewater thereby, refer to the treatment process of the waste water of the heavy metals such as a kind of cupric, nickel, chromium especially.
Background technology
Heavy metal industrial effluent is the very complicated trade effluent of a kind of composition, mainly from the waste water that the enterprises such as mine, smelting, electrolysis, plating, agricultural chemicals, medicine, paint, pigment discharge.Main containing various heavy, grease, soda acid, organism etc. in waste water.Often Pollutant levels are high, toxicity large for this kind of waste water, be difficult to biological degradation, not only polluted water environment, the also serious threat mankind and hydrobiological existence.China's heavy metal pollution of water body problem is very outstanding, the pollution rate of river,lake and reservior substrate up to 80.1%, the content overproof of lead, copper, mercury, chromium, cadmium, zinc in immediate offshore area seawater sampling product.In recent years, the poisoning caused by heavy metal wastewater therebies such as copper, nickel, chromium occurs repeatedly.Heavy metal contamination has become the great environmental problem being related to human health and life.
The method of tradition heavy-metal ion removal waste water is a lot, comprises the precipitator method, electrochemical treatment technology, physico-chemical processes, biochemical process etc., but all there is some weak point.
Chemical precipitation method is traditional and the electroplating waste water treatment technology of practicality, by adding as precipitation agents such as sodium hydroxide, carbonate, sulfide, carbaminate, benzoates in waste water, making heavy metal precipitated and removing.This method processing cost is low, convenient management, adds that sand filtration can make effluent quality clarify, qualified discharge, a kind of economical and effective method of can yet be regarded as.But it also has its weak point, sedimentation speed is comparatively slow, is separated not thorough, needs extra dosing coagulant and flocculation agent.Likely cause secondary pollution, and sludge quantity is large, and the drawback that heavy metal not easily reclaims.
Summary of the invention
The present invention proposes a kind for the treatment of process of heavy metal wastewater thereby, solves the drawback that chemical precipitation method sedimentation speed of the prior art is slow, heavy metal not easily reclaims.
Technical scheme of the present invention is achieved in that a kind for the treatment of process of heavy metal wastewater thereby, comprises the following steps:
Step one: pass into heavy metal wastewater thereby in settling tank, passes into air in heavy metal wastewater thereby and heavy metal waste water stirs, and passes in the process of air and stirring and adds NaOH, and the pH making heavy metal wastewater thereby is 8-8.5, makes the Cu in heavy metal wastewater thereby
2+be transformed into Cu (OH)
2deposit seeds, makes Cr
3+be transformed into Cr (OH)
3deposit seeds; Pass in the process of air and stirring and add NaOH, the pH making heavy metal wastewater thereby is 9.5-9.8, makes the Ni in heavy metal wastewater thereby
2+be transformed into Ni (OH)
2deposit seeds.
Step 2: passed into by heavy metal wastewater thereby in separate tank, is equipped with PVDF curtain type membrane bio-reactor in separate tank, the filtrate of heavy metal wastewater thereby after PVDF curtain type membrane bio-reactor filters is pumped through magnetic drive pump.
Further, the throw out blocked through the PVDF curtain type membrane of PVDF curtain type membrane bio-reactor in described step 2 is by surge pump press-in pressure mud machine, and throw out is pressed into solid matter and sends out process outer by pressure mud machine.
Further, in described step one, at the bottom of the pond of settling tank, arrange tracheae, described tracheae connects inflating pump.
Further, with the pH of pH value control instruments setting heavy metal wastewater thereby, the amount of NaOH is determined by the pH value set.
Further, the bottom of the PVDF curtain type membrane frame of described PVDF curtain type membrane bio-reactor is provided with aeration tube, and described aeration tube connects inflating pump.
Further, the top of the PVDF curtain type membrane frame of described PVDF curtain type membrane bio-reactor connects a port of magnetic drive pump by pipeline, another port of magnetic drive pump connects backwashing water water pipe and filtrate pipe respectively by a Y-tube, described backwashing water water pipe is for accessing backwashing water, and described filtrate pipe is for being transported away the filtrate after filtration.
Further, described backwashing water water pipe and described magnetic drive pump are provided with a valve, are provided with a valve between described filtrate pipe and described magnetic drive pump.
Further, the reaction times added in step one after NaOH is 20min.
Advantageous Effects of the present invention: the treatment process of heavy metal wastewater thereby of the present invention is by heavy metal waste water inflating stirring, and add NaOH, heavy metal cation is fully contacted with negatively charged ion, and the pH controlling waste water is 8-8.5, makes nickel ion be precipitated as Ni (OH) completely
2; The pH controlling waste water is 9.5-9.8, makes cupric ion be precipitated as Cu (OH) completely
2, make chromium ion be precipitated as Cr (OH) completely
3, sedimentation speed is fast; To precipitate simultaneously completely heavy metal wastewater thereby through PVDF curtain type membrane bio-reactor, filtrate heavy metal content after filtration is low, considerably beyond discharging standards, the throw out containing heavy metal after simultaneously filtering is pressed into solid matter through overvoltage mud machine and sends out process outer, solid waste can reuse, can be resell raw material business, continues to produce the raw materials such as CuSO4, NiSO4.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation of each equipment in the treatment process of a kind of heavy metal wastewater thereby of the present invention in separate tank.
In accompanying drawing, 1-separate tank; 2-presses mud machine; 3-PVDF curtain type membrane bio-reactor; 4-aeration tube; 5-inflating pump; 6-presses mud pipe; 7-magnetic drive pump; 8-valve; 9-backwashing water water pipe; 10-filtrate pipe.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
A treatment process for heavy metal wastewater thereby, comprises the following steps:
Step one: pass into heavy metal wastewater thereby in settling tank, passes into air in heavy metal wastewater thereby and heavy metal waste water stirs, and passes in the process of air and stirring and adds NaOH, and the pH making heavy metal wastewater thereby is 8-8.5, makes the Cu in heavy metal wastewater thereby
2+be transformed into Cu (OH)
2deposit seeds, makes Cr
3+be transformed into Cr (OH)
3deposit seeds; Pass in the process of air and stirring and add NaOH, the pH making heavy metal wastewater thereby is 9.5-9.8, makes the Ni in heavy metal wastewater thereby
2+be transformed into Ni (OH)
2deposit seeds.
Step 2: as shown in Figure 1, passes in separate tank 1 by heavy metal wastewater thereby, PVDF curtain type membrane bio-reactor 3 is housed in separate tank 1, and the filtrate of heavy metal wastewater thereby after PVDF curtain type membrane bio-reactor 3 filters is pumped through magnetic drive pump 7.
As shown in Figure 1, the throw out blocked through the PVDF curtain type membrane of PVDF curtain type membrane bio-reactor 3 in described step 2 presses mud machine 2 by surge pump press-in, and throw out is pressed into solid matter method and processes outward by pressure mud machine 2.
In described step one, at the bottom of the pond of settling tank, arrange tracheae, described tracheae connects inflating pump.
With the pH of pH value control instruments setting heavy metal wastewater thereby, determined the amount of NaOH by the pH value set.
The bottom of the PVDF curtain type membrane frame of described PVDF curtain type membrane bio-reactor 3 is provided with aeration tube 4, and described aeration tube 4 connects inflating pump 5.
The top of the PVDF curtain type membrane frame of described PVDF curtain type membrane bio-reactor 3 connects a port of magnetic drive pump 7 by pipeline, another port of magnetic drive pump 7 connects backwashing water water pipe 9 and filtrate pipe 10 respectively by a Y-tube, described backwashing water water pipe 9 is for accessing backwashing water, and described filtrate pipe 10 is for being transported away the filtrate after filtration.Backwashing water rinses PVDF curtain type membrane.
Described backwashing water water pipe 9 is provided with a valve 8 with described magnetic drive pump 7, is provided with a valve 8 between described filtrate pipe 10 and described magnetic drive pump 7.
Adding the reaction times after NaOH in step one is 20min.Sedimentation speed is fast.
PVDF curtain type membrane film silk surface apertures is less than 0.03um, heavy metal Cu ion, Ni ion, and Cr ion etc. becomes Cu (OH)
2, Cr (OH)
3, Ni (OH)
2precipitation is stood, and the ratio through PVDF curtain type membrane is less than six thousandths, and as contained Cu ion 30mg/L in former water, then discharge water Cu ion is less than 0.005mg/L, far below discharging standards.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. a treatment process for heavy metal wastewater thereby, is characterized in that, comprises the following steps:
Step one: pass into heavy metal wastewater thereby in settling tank, air is passed into and heavy metal waste water stirs in heavy metal wastewater thereby, pass in the process of air and stirring and add NaOH, the pH making heavy metal wastewater thereby is 8-8.5, makes to be transformed into Cu (OH) in heavy metal wastewater thereby
2deposit seeds, makes Cr
3+be transformed into Cr (OH)
3deposit seeds; Pass in the process of air and stirring and add NaOH, the pH making heavy metal wastewater thereby is 9.5-9.8, makes the Ni in heavy metal wastewater thereby
2+be transformed into Ni (OH)
2deposit seeds;
Step 2: passed into by heavy metal wastewater thereby in separate tank, is equipped with PVDF curtain type membrane bio-reactor in separate tank, the filtrate of heavy metal wastewater thereby after PVDF curtain type membrane bio-reactor filters is pumped through magnetic drive pump.
2. as the treatment process of claim 1 heavy metal wastewater thereby, it is characterized in that: the throw out blocked through the PVDF curtain type membrane of PVDF curtain type membrane bio-reactor in described step 2 is by surge pump press-in pressure mud machine, and throw out is pressed into solid matter and sends out process outer by pressure mud machine.
3. as the treatment process of claim 1 heavy metal wastewater thereby, it is characterized in that: in described step one, at the bottom of the pond of settling tank, arrange tracheae, described tracheae connects inflating pump.
4. as the treatment process of claim 1 heavy metal wastewater thereby, it is characterized in that: with the pH of pH value control instruments setting heavy metal wastewater thereby, determined the amount of NaOH by the pH value set.
5. as the treatment process of claim 1 heavy metal wastewater thereby, it is characterized in that: the bottom of the PVDF curtain type membrane frame of described PVDF curtain type membrane bio-reactor is provided with aeration tube, described aeration tube connects inflating pump.
6. as the treatment process of claim 1 heavy metal wastewater thereby, it is characterized in that: the top of the PVDF curtain type membrane frame of described PVDF curtain type membrane bio-reactor connects a port of magnetic drive pump by pipeline, another port of magnetic drive pump connects backwashing water water pipe and filtrate pipe respectively by a Y-tube, described backwashing water water pipe is for accessing backwashing water, and described filtrate pipe is for being transported away the filtrate after filtration.
7. as the treatment process of claim 6 heavy metal wastewater thereby, it is characterized in that: described backwashing water water pipe and described magnetic drive pump are provided with a valve, between described filtrate pipe and described magnetic drive pump, be provided with a valve.
8. as the treatment process of claim 1 heavy metal wastewater thereby, it is characterized in that: adding the reaction times after NaOH in step one is 20min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510391124.1A CN105000752A (en) | 2015-07-02 | 2015-07-02 | Treatment method of heavy metal wastewater |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510391124.1A CN105000752A (en) | 2015-07-02 | 2015-07-02 | Treatment method of heavy metal wastewater |
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| CN105000752A true CN105000752A (en) | 2015-10-28 |
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| CN201510391124.1A Pending CN105000752A (en) | 2015-07-02 | 2015-07-02 | Treatment method of heavy metal wastewater |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107973437A (en) * | 2017-10-25 | 2018-05-01 | 镇江市丹徒区华发五金有限公司 | A kind of Purification by filtration technique of copper-bearing industrial wastewater |
| CN108911136A (en) * | 2018-07-17 | 2018-11-30 | 厦门理工学院 | A kind of processing method of heavy metal wastewater thereby |
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| CN200978232Y (en) * | 2006-12-11 | 2007-11-21 | 深圳市金达莱环保股份有限公司 | Processing system for concentrated liquid of high-concentration waste water condensed by reverse osmosis |
| CN203700065U (en) * | 2013-10-25 | 2014-07-09 | 浙江博世华环保科技有限公司 | Refuse landfill leachate membrane treatment concentrated liquid treatment system |
| CN103964609A (en) * | 2014-05-16 | 2014-08-06 | 天津海普尔膜科技有限公司 | Membrane treatment method of landfill leachate concentrate |
| US20160075579A1 (en) * | 2014-09-15 | 2016-03-17 | Velocys Technologies, Ltd. | Methods of Making Purified Water from the Fischer-Tropsch Process |
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2015
- 2015-07-02 CN CN201510391124.1A patent/CN105000752A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200978232Y (en) * | 2006-12-11 | 2007-11-21 | 深圳市金达莱环保股份有限公司 | Processing system for concentrated liquid of high-concentration waste water condensed by reverse osmosis |
| CN203700065U (en) * | 2013-10-25 | 2014-07-09 | 浙江博世华环保科技有限公司 | Refuse landfill leachate membrane treatment concentrated liquid treatment system |
| CN103964609A (en) * | 2014-05-16 | 2014-08-06 | 天津海普尔膜科技有限公司 | Membrane treatment method of landfill leachate concentrate |
| US20160075579A1 (en) * | 2014-09-15 | 2016-03-17 | Velocys Technologies, Ltd. | Methods of Making Purified Water from the Fischer-Tropsch Process |
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| 周迟骏: "《环境工程设备设计手册》", 31 January 2009, 化学工业出版社 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107973437A (en) * | 2017-10-25 | 2018-05-01 | 镇江市丹徒区华发五金有限公司 | A kind of Purification by filtration technique of copper-bearing industrial wastewater |
| CN108911136A (en) * | 2018-07-17 | 2018-11-30 | 厦门理工学院 | A kind of processing method of heavy metal wastewater thereby |
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Application publication date: 20151028 |
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