CN208561983U - A kind of heavy metal waste water treatment system - Google Patents

A kind of heavy metal waste water treatment system Download PDF

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Publication number
CN208561983U
CN208561983U CN201820997412.0U CN201820997412U CN208561983U CN 208561983 U CN208561983 U CN 208561983U CN 201820997412 U CN201820997412 U CN 201820997412U CN 208561983 U CN208561983 U CN 208561983U
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heavy metal
waste water
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water treatment
treatment system
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李骎
马文臣
甄胜利
赵静
王铸
王伟龙
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Beijing Geoenviron Engineering and Technology Inc
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Beijing Geoenviron Engineering and Technology Inc
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Abstract

The utility model discloses a kind of heavy metal waste water treatment systems.The heavy metal waste water treatment system includes sequentially connected: conditioning tank, level-one high-efficiency clarifier, intermediate pool, second level flocculation tank, second level high-efficiency clarifier, sand filter, promotes pond, cartridge filter, hyperfiltration membrane assembly, ultrafiltration production pond, active carbon adsorber, clear water reserviors at level-one flocculation tank;Wherein, the concentrated water outlet of the hyperfiltration membrane assembly is connected to conditioning tank.The utility model has the beneficial effects that the utility model can efficiently remove the heavy metal ion pollutants such as As, Pb, Cd, Zn in the industrial wastewaters such as ore dressing draining, metal smelt, intermetallic composite coating simultaneously;The construction investment cost and operating cost rather moderate of the utility model are easy to promote and apply in whole industry heavy metal containing wastewater treatment field;Treated, and water outlet major pollutants index has reached " water environment quality standard " (GB3838-2002) III class standard of high stringency.

Description

A kind of heavy metal waste water treatment system
Technical field
The utility model belongs to industrial waste water treatment, more particularly, to a kind of heavy metal containing wastewater treatment system System.
Background technique
With the heavy metal pollution event frequently to happen suddenly in recent years, heavy metal pollution increasingly attracts people's attention, It is one of maximum water pollution problems of harm, heavy metal refers mainly to mercury (Hg), cadmium (Cd), lead (Pb), chromium (Cr), arsenic (As), copper (Cu), zinc (Zn), cobalt (Co), nickel (Ni) etc. are big with toxicity, be not easily decomposed, be easily bioaccumulation and have biomagnification The features such as, mainly pass through mining, metal smelt, intermetallic composite coating and chemical production wastewater, fossil-fueled, applying pesticides and life The man-made pollution sources such as rubbish living are discharged into water body, and not only polluted source, also seriously threatens the existence and health of the mankind.
Currently, there are two main classes for the method for processing heavy metal ion-containing waste water, first is that making the passing through of heavy metal of solubilised state Reaction is learned to form insoluble heavy metal compound precipitating and remove, can applied chemistry coagulant sedimentation, electrodeposit method, ion float Select method etc.;Second is that it is concentrated and is separated under conditions of not changing original Chemical Forms of Heavy Metals, it can Applied Physics suction Attached method, ion-exchange, membrane separation process etc..
Chemical precipitation method as conventional waste water processing method, development time length, technical maturity, removal efficiency are high, range is wide, Economical and convenient and obtain more application.Chemical precipitation method, which is directed to addition medicament in heavy metal wastewater thereby, to be made by chemical reaction in molten The heavy metal of solution state is changed into compound precipitation not soluble in water and removes, including neutralization precipitation method, sulphide precipitation, also The former precipitation method and ferrite coprecipitation etc..Wherein neutralization precipitation method is a kind of most widely used method, into heavy metal wastewater thereby Adding alkali nertralizer (usually milk of lime, NaOH) makes the heavy metal in waste water form the lesser hydroxide of solubility or carbonic acid Salt is precipitated and is removed, including primary sedimentation method and two kinds of fractional precipitation.Primary sedimentation simple process, but it is unfavorable for heavy metal Recycling, fractional precipitation precipitate various metals respectively, this method complex process, pH value control requirement is stringent, together by adjusting pH value When be conducive to the recycling of heavy metal.
Ion-exchange is in the free-moving ion of energy and solution processed using ion-exchanger itself institute band Ion realizes the method that harmful substance separates in waste water by ion exchange.The power for pushing ion exchange is interionic concentration Function base in difference and exchanger is to the affinity of ion, and ion is first to be adsorbed, then exchanged in most cases, and ion is handed over Changing agent has absorption, exchange double action.Concentration of heavy metal ion is heavy far below chemistry in water outlet after ion exchange technique purification Method treated concentration in shallow lake may be implemented the recycling of heavy metal by the solution after regeneration, while also avoid chemical precipitation method The a large amount of sludge generated are handled, the waste water big suitable for concentration low wash water is unsuitable for handling the waste water excessively high containing heavy metal concentration.
There are commonly diffusion dialysis, electrodialysis, ultrafiltration, reverse osmosis etc. for membrane separation process, will be molten in solution using semi-permeable membrane Agent infiltrates into the film other side, and heavy metal ion solution is made to reach concentration and separation.The method has separative efficiency height, equipment simple, behaviour Make the features such as easy, there is comparable technical advantage in water treatment field, can not only make applied in heavy metal containing wastewater treatment It must be discharged and reach discharge standard and reuse production, and heavy metal resources can be recycled, there is important application value.
Requirement with country to heavy metal wastewater thereby discharge index is increasingly strict, in actual production, only leans on single place Reason technique unit has been unable to meet the standard of heavy metals emission.Therefore kinds of processes unit should be combined in technological design and is integrated Consider.
Utility model content
The purpose of this utility model is to be combined optimization for above-mentioned single heavy metal treatment process, combines chemistry The precipitation method and membrane separation technique guarantee the efficient removal of heavy metal ions in wastewater, reach the effluent quality standard of high stringency, " water environment quality standard " (GB3838-2002) III class standard.
To achieve the goals above, the utility model provides a kind of heavy metal waste water treatment system, at the heavy metal wastewater thereby Reason system includes sequentially connected:
Conditioning tank, level-one flocculation tank, level-one high-efficiency clarifier, intermediate pool, second level flocculation tank, second level are efficient Clarifier, sand filter promote pond, cartridge filter, hyperfiltration membrane assembly, ultrafiltration production pond, active carbon adsorber, clear water reserviors;
Wherein, the concentrated water outlet of the hyperfiltration membrane assembly is connected to conditioning tank.
As the utility model preferred embodiment, the heavy metal waste water treatment system further includes sequentially connected dirt Mud thickener and sludge dehydration device;
The mud discharging mouth of the level-one high-efficiency clarifier and the second level high-efficiency clarifier with the sludge concentration tank Connection;
The supernatant outlet of the supernatant outlet of the sludge concentration tank and the sludge dehydration device with it is described Conditioning tank connection.
As the utility model preferred embodiment, the heavy metal waste water treatment system further includes chemicals dosing plant, institute Chemicals dosing plant is stated for adding medicament into level-one flocculation tank and/or second level flocculation tank.
As the utility model preferred embodiment, the chemicals dosing plant include medicine-chest, blender, dosing pump, valve, On-line checking instrument and electric cabinet.
As the utility model preferred embodiment, it is provided with the first agitating device in the conditioning tank, plays faster The effect of regulating water quality water more evenly.
As the utility model preferred embodiment, in the level-one flocculation tank and second level flocculation tank respectively It is provided with the second agitating device and third agitating device, that realizes medicament and waste water is sufficiently mixed agitating function, accelerates its chemistry The progress of reaction.
As the utility model preferred embodiment, the ultrafiltration membrane that the hyperfiltration membrane assembly uses is flat ultrafiltration Film, rolling ultrafiltration membrane or hollow fiber form ultrafiltration membrane.
As the utility model preferred embodiment, the sludge concentration tank be gravity concentration tank, floatation thickening pond or Centrifugal concentrating pond.
As the utility model preferred embodiment, the sludge dehydration device is filter pressing dehydrator, centrifugal dehydrator Or sludge drying bed.
In the utility model operational process, according to heavy metal contained by the different raw water qualities of analysis and water situation and waste water Type and concentration, generally directed to the industry such as such as ore dressing draining, metal smelt, non-ferrous metals processing and pesticide, medicine, fuel Contain contents of many kinds of heavy metal ion, such as Zn, Cd, Pb, As in waste water, using " conditioning tank+two-stage chemical reaction precipitating+sand filtration+ The process route of the processing heavy metal wastewater thereby of ultrafiltration+activated carbon adsorption ", is accomplished in the following manner:
Step 1: will first contain heavy metal ion raw water and lead to conditioning tank under room temperature, which has storage, adjusts and ease up Raw water quality water is adjusted in the effect of punching, and de- to the concentrate, sludge concentration tank and sludge of hyperfiltration membrane assembly reflux The supernatant fluid filtrate and raw wastewater of water installations are sufficiently mixed homogenizing, guarantee the stability of subsequent two-stage reaction precipitating Inlet and outlet water, more preferably Realization chemical reaction and precipitating removal;
Step 2: the boosted pump of step 1 treated waste water enters level-one flocculation tank, adjusts pH value 9~10.5, And heavy metal chelating agent is added, it reacts to form the precipitation of heavy metal ion insoluble matter with the heavy metal ion in waste water, be added simultaneously Complex reaction occurs for polymeric complexing agent and heavy metal ion, adds flocculant, is up to the small molecule of critical micelle concentration Particle forms the cotton-shaped group of macromolecular, and micelle size reaches 0.005-0.1 μm, meets the requirement of ultra-filtration and separation.
The acid and/or alkaline matter for adjusting pH value are respectively as follows: acid, including hydrochloric acid or sulfuric acid;Alkali, including NaOH, milk of lime Or quick lime.
The heavy metal chelating agent can select different agent for capturing according to heavy metal ion type and content, mainly include with Under it is several: a. lye, including NaOH, KOH, milk of lime or the reactant for generating above lye, to form the metal hydrogen-oxygen of indissoluble Compound precipitating;B. sulfide, including Na2S、K2S or the reactant for generating both the above substance, to form the metal vulcanization of indissoluble Object precipitating;C. reducing agent, including FeSO4, iron powder, by heavy metal ion be reduced into metal simple-substance or the lower metal of valence state from Son.
The polymeric complexing agent includes the surfactant of organic synthesis, water-soluble polymer etc., with heavy metal ion Synergistic effect is generated, macromolecular micella and complex compound are formed.
The flocculant includes FeCl3, the molysite, aluminium salt such as ferric sulfate, form ferrite or Admicelle to trap cladding Heavy metal ion forms precipitating.
Step 3: step 2 treated waste water is staticly settled from flowing in level-one high-efficiency clarifier, passes through separation of solid and liquid By the sludge containing heavy metal, precipitation and separation is come out from waste water, and removal rate can reach 70%, and sludge sediment enters Treatment of Sludge system System, if by sludge concentration tank, sludge dehydration device processing after mud cake regard as dangerous waste, subsequently through dangerous waste processing system into The supernatant fluid filtrate of row dangerous waste disposal, concentration and dehydration is back to conditioning tank.
Step 4: the supernatant being discharged after the processing of step 3 level-one high-efficiency clarifier passes through the of short duration hydraulic retention of intermediate pool Enter second level flocculation tank afterwards, handles with level-one flocculation tank, further precipitate heavy metal ion remaining in waste water It is precipitated.
Step 5: from flowing in second level high-efficiency clarifier, treatment process is efficiently clear with level-one for step 4 treated water outlet Clear device, removal of heavy metal ions rate can reach 95% after two-stage chemical reaction precipitates.
Step 6: step 5 second level high-efficiency clarifier treated supernatant enters sand filter, sand filter is for removing two The remaining non-solubility solid that can not be settled in being discharged after order reaction precipitating, such as remaining part macromolecular solid particle and glue Body, the SS concentration in waste water can be made to be down to 10mg/L by sand filter hereinafter, filtering water outlet enter promoted pond, for it is subsequent into Enter hyperfiltration membrane assembly and necessary hydraulic pressure is provided.
Using quartz sand as filler, partial size has the sand filter according to water quality situation, conventional selection OrThe rate of filtration of the waste water in sand filter is 8-12m/ H need to backwash sand filter, back washing strength 12L/m when sand filter pressure at two ends is more than 0.07Mpa2.S.Sand Filter, up to 90% or more, guarantees the pollution index SDI of filtering water outlet to suspended matter in water and macromolecular particle object removal efficiency ≤5。
Step 7: the promotion tank water of step 6 is lifted into cartridge filter through intake pump, enters back into ultrafiltration after filtering Membrane module, under pressure, the complexing of water apoplex involving the channels and collaterals mixture increase complex object, floccule body and the small molecule particle of glue It is retained by the ultrafiltration membrane of hyperfiltration membrane assembly, forms concentrate and be back to conditioning tank, ultrafiltration produces water and enters ultrafiltration production pond.It is described super Filter membrane includes that complete membranous system raw water pump, filter, backwashing pump, backwash chemicals dosing plant and valve instrument are automatically controlled.
Step 8: step 7 ultrafiltration production tank water is pumped into active carbon adsorber and is made by the superpower physical absorption of active carbon With further removing a small amount of complexing agent and small molecule contaminants in water removal, water outlet enters clear water reserviors, guarantees the effluent quality of discharge Reach III class standard of surface water.
The active carbon adsorber is using high-quality shell-shaped active carbon as filtrate, rate of filtration 8-12m/h, bottom A small amount of bulky grain quartz sand is loaded as support layer, prevents active carbon leakage contribution effluent quality, big using activated carbon surface product, The features such as strong adsorption, COD removal rate is up to 70% or more.
The utility model has the beneficial effects that
1) the utility model is to the weight such as As, Pb, Cd, Zn in the industrial wastewaters such as ore dressing draining, metal smelt, intermetallic composite coating Contaminant metal ions can be removed efficiently simultaneously;
2) coagulation is carried out to heavy metal wastewater thereby using two-stage chemical reaction precipitating, recycle heavy metal and complexing agent, The complex reaction of flocculant and Flocculating mechanism form enhancing micella and are used in combination again with ultrafiltration apparatus and active carbon adsorber Reinforced absorption and filtration function, process route is brief, strong operability, and removal of heavy metal ions rate is high, it is easy to accomplish each stage it is automatic Change operation and monitoring, convenient for management;
3) the construction investment cost and operating cost rather moderate of the utility model, is easy at whole industry heavy metal wastewater thereby Reason field promotes and applies;
4) treated, and water outlet major pollutants index has reached " water environment quality standard " of high stringency (GB3838-2002) III class standard.
Other features and advantages of the utility model will then part of the detailed description can be specified.
Detailed description of the invention
The utility model illustrative embodiments are described in more detail in conjunction with the accompanying drawings, the utility model it is upper It states and other purposes, feature and advantage will be apparent, wherein in the utility model illustrative embodiments, phase Same reference label typically represents same parts.
Fig. 1 shows a kind of schematic diagram of heavy metal waste water treatment system of the utility model one embodiment.
Description of symbols: 1- conditioning tank, 2- level-one flocculation tank, 3- level-one high-efficiency clarifier, 4- intermediate pool, 5- second level flocculation tank, 6- second level high-efficiency clarifier, 7- sand filter, 8- promote pond, 9- cartridge filter, 10- ultrafiltration membrane Component, 11- ultrafiltration produce pond, 12- active carbon adsorber, 13- clear water reserviors, 14- sludge concentration tank, 15- sludge dehydration device.
Specific embodiment
Preferred embodiments of the present invention are described in more detail below.Although the following describe the utility model Preferred embodiment, however, it is to be appreciated that may be realized in various forms the utility model without the implementation that should be illustrated here Mode is limited.On the contrary, thesing embodiments are provided so that the utility model is more thorough and complete, and can be by this The range of utility model is completely communicated to those skilled in the art.
Embodiment 1
As shown in Figure 1, heavy metal wastewater thereby enters conditioning tank 1, be sufficiently mixed ultrafiltration reflux concentrated water, sludge condensation supernatant with And level-one flocculation tank 2 is pumped into after sludge dewatering supernatant;According to different heavy metal ion add different agents and As, Optimal pH range when the heavy metal ion such as Zn, Cd, Pb initially form precipitating in aqueous solution, precipitate complete is different, through throwing Acid/base is added to adjust pH to 9~10.5, add heavy metal chelating agent, polymeric complexing agent and flocculant, in the work of agitating device Make to chemically react under and sufficiently carry out;Enter level-one high-efficiency clarifier 3 after the reaction was completed to staticly settle, supernatant is through centre Pond 4 is promoted to second level flocculation tank 5 again, and it is high to enter second level with level-one flocculation tank 2 after the reaction was completed for reaction process Effect clarifier 6 staticly settles;Two-stage chemical reaction precipitating is to remove the core process of heavy metal ions in wastewater, and sludge is heavy Cinder ladle is covered with heavy metal ion and uniformly enters sludge treating system, is concentrated by sludge concentration tank 14 and sludge dehydration device 15 de- Enter subsequent dangerous waste processing system after water process, the supernatant fluid filtrate of sludge concentration tank 14 and sludge dehydration device 15 is back to adjusting Pond 1;Second level high-efficiency clarifier supernatant enters sand filter 7, and the non-dissolution that can not be settled in water removal is gone by quartz sand filler Property solid, further decreases the SS concentration in water;The water outlet of sand filter 7, which enters, promotes pond 8, to provide ultrafiltration system necessary water Power is forced, then cartridge filter 9 is entered by membranous system raw water pump, hyperfiltration membrane assembly 10, hyperfiltration membrane assembly 10 are entered after filtering Ultrafiltration concentrate recirculation to conditioning tank 1, ultrafiltration, which produces water and enters ultrafiltration, produces pond 11, water outlet substantially removal major part heavy metal from Son has reached III class standard of surface water of high standard, for the stably reaching standard discharge for ensuring final outflow water water quality, finally passes through work again Property charcoal absorber 12, entering clear water reserviors 13 using the superpower adsorption capacity of active carbon, after the completion of adsorption filtration stores for future use or discharges, High standards of the strict guarantee water outlet to heavy metal ion content.
Each embodiment of the utility model is described above, above description is exemplary, and non-exclusive, and And it is also not necessarily limited to disclosed each embodiment.Without departing from the scope and spirit of illustrated each embodiment, for Many modifications and changes are obvious for those skilled in the art.

Claims (9)

1. a kind of heavy metal waste water treatment system, which is characterized in that the heavy metal waste water treatment system includes sequentially connected:
Conditioning tank, level-one flocculation tank, level-one high-efficiency clarifier, intermediate pool, second level flocculation tank, second level are efficiently clarified Device, sand filter promote pond, cartridge filter, hyperfiltration membrane assembly, ultrafiltration production pond, active carbon adsorber, clear water reserviors;
Wherein, the concentrated water outlet of the hyperfiltration membrane assembly is connected to conditioning tank.
2. heavy metal waste water treatment system according to claim 1, which is characterized in that the heavy metal waste water treatment system It further include sequentially connected sludge concentration tank and sludge dehydration device;
The mud discharging mouth of the level-one high-efficiency clarifier and the second level high-efficiency clarifier is connect with the sludge concentration tank;
The supernatant outlet of the supernatant outlet of the sludge concentration tank and the sludge dehydration device with the adjusting Pond connection.
3. heavy metal waste water treatment system according to claim 1, which is characterized in that the heavy metal waste water treatment system It further include chemicals dosing plant, the chemicals dosing plant is for adding medicament into level-one flocculation tank and/or second level flocculation tank.
4. heavy metal waste water treatment system according to claim 3, which is characterized in that the chemicals dosing plant include medicine-chest, Blender, dosing pump, valve, on-line checking instrument and electric cabinet.
5. heavy metal waste water treatment system according to claim 1, which is characterized in that be provided with first in the conditioning tank Agitating device.
6. heavy metal waste water treatment system according to claim 1, which is characterized in that the level-one flocculation tank and two The second agitating device and third agitating device are respectively arranged in grade flocculation tank.
7. heavy metal waste water treatment system according to claim 1, which is characterized in that the hyperfiltration membrane assembly uses super Filter membrane is flat-plate ultrafiltration membrane, rolling ultrafiltration membrane or hollow fiber form ultrafiltration membrane.
8. heavy metal waste water treatment system according to claim 2, which is characterized in that the sludge concentration tank is that gravity is dense Contracting pond, floatation thickening pond or centrifugal concentrating pond.
9. heavy metal waste water treatment system according to claim 2, which is characterized in that the sludge dehydration device is filters pressing Dewaterer, centrifugal dehydrator or sludge drying bed.
CN201820997412.0U 2018-06-26 2018-06-26 A kind of heavy metal waste water treatment system Active CN208561983U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112811644A (en) * 2020-12-22 2021-05-18 利晟(杭州)科技有限公司 Zinc-containing water pollution treatment system and method
CN114590945A (en) * 2022-03-23 2022-06-07 国网河北省电力有限公司电力科学研究院 Method for removing heavy metals in desulfurization wastewater

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112811644A (en) * 2020-12-22 2021-05-18 利晟(杭州)科技有限公司 Zinc-containing water pollution treatment system and method
CN114590945A (en) * 2022-03-23 2022-06-07 国网河北省电力有限公司电力科学研究院 Method for removing heavy metals in desulfurization wastewater
CN114590945B (en) * 2022-03-23 2024-02-13 国网河北省电力有限公司电力科学研究院 Method for removing heavy metals in desulfurization wastewater

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