CN108439666A - A kind of heavy metal chelating agent reactive tank and utilize its process for treating heavy-metal waste water - Google Patents
A kind of heavy metal chelating agent reactive tank and utilize its process for treating heavy-metal waste water Download PDFInfo
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- CN108439666A CN108439666A CN201810808505.9A CN201810808505A CN108439666A CN 108439666 A CN108439666 A CN 108439666A CN 201810808505 A CN201810808505 A CN 201810808505A CN 108439666 A CN108439666 A CN 108439666A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
- C02F1/62—Heavy metal compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/002—Construction details of the apparatus
- C02F2201/007—Modular design
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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- Separation Of Suspended Particles By Flocculating Agents (AREA)
- Removal Of Specific Substances (AREA)
Abstract
The present invention discloses a kind of heavy metal chelating agent reactive tank and utilizes its process for treating heavy-metal waste water.Reactive tank includes：Cone bucket formula sludge collecting tank, first order reaction slot, first order reaction slot blender, second order reaction slot, second order reaction slot blender and sludge delivery pump, wherein three slots are connected in series；Cone bucket formula sludge collecting tank is with first order reaction slot through partition board top trepanning unicom；First order reaction slot is with second order reaction slot through the lower partition trepanning unicom；Cone bucket formula sludge collecting tank is connect through sludge delivery pump with second order reaction slot.Process for treating heavy-metal waste water substantially reduces heavy metal chelating agent dosage, reduce the operating cost of wastewater treatment, strengthen the sedimentation separation effect that heavy metal chelating agent reacts the small amount insoluble matter to be formed with low-concentration heavy metal ions in waste water, improves removal of heavy metal ions rate.Total technological process is simpler, and effluent quality is more stable.
Description
Technical field
The present invention relates to heavy metal containing wastewater treatment field, relate more specifically to a kind of new heavy metal chelating agent reactive tank and
Utilize its process for treating heavy-metal waste water.
Background technology
The industrial enterprises such as stainless steel, plating will produce heavy metal wastewater thereby in process of manufacture, for example, being rolled in stainless steel
In steel acid cleaning process, the waste water containing heavy metal ion such as chromium, nickel will produce.Currently, the processing for heavy metal wastewater thereby, usually
Use the treatment process based on " neutralize, precipitation, filtering ", this it will be apparent to those skilled in the art that Fig. 1 show it is common
A kind of heavy metal waste water treatment process flow（One）.
As environmental pollution improvement requires increasingly to improve, the discharge standard of heavy metal wastewater thereby is increasingly stringenter, such as《Steel work
Industry pollution discharge standard》（GB 13456-2012）The discharge standard of middle proposition.The enterprise of given area should execute《Steel
Industrial water pollution object discharge standard》（GB 13456-2012）The special emission limit of water pollutant as defined in middle table 3, wherein chromium and
The emission limit of nickel is respectively 0.1mg/L and 0.05mg/L.In the case, " neutralization, precipitation, mistake common in the art
Filter " heavy metal waste water treatment process is just difficult to meet above-mentioned processing requirement.
More and more process for treating heavy-metal waste water, especially heavy metal wastewater thereby deep treatment method are developed as a result,
Out, as using processing methods such as ion exchange resin absorption and micro-filtration, ultrafiltration or reverse osmosis membrane filtrations.However, above-mentioned place
Reason method has that cost and operating cost are expensive.
In addition, also having using the processing method for adding heavy metal chelating agent, heavy metal chelating agent can be with solubilised state in waste water
Heavy metal ion reacts to form insoluble matter, and then is removed it by way of precipitating, filtering.
Costly due to heavy metal chelating agent price, usually it is used in combination with " neutralize, precipitation, filter " technique.
A kind of common combined treatment process is that heavy metal chelating agent reactive tank is arranged in neutralization reaction slot rear end, by heavy metal chelating agent
It adds to heavy metal chelating agent reactive tank.Fig. 2 shows another heavy metal waste water treatment process methods in the prior art.Herein
In process, alkali first is added in neutralization reaction slot, is allowed to react with most of solubilised state heavy metal ion in waste water, it is raw
At insoluble petal hydroxide；Heavy metal chelating agent is added in heavy metal chelating agent reactive tank again, with remaining low concentration
Solubilised state heavy metal ion is reacted, and insoluble matter is generated；Finally by precipitation, filters and remove from waste water insoluble matter.
The structure of common heavy metal chelating agent reactive tank is as shown in Fig. 3.For this heavy metal waste water treatment process
Slot structure is reacted with heavy metal chelating agent, is had the following problems：Heavy metal chelating agent is added directly after adding alkali neutralization
In heavy metal wastewater thereby, at this time there are a large amount of metal hydroxides sludge in waste water, these sludge can consume reaction part weight
Metal agent for capturing, to reduce the efficiency that heavy metal chelating agent specific aim removes low concentration solubilised state heavy metal ion, thus again
Metal agent for capturing consumption is larger.
Fig. 4 shows the combined treatment process of another common heavy metal containing wastewater treatment.The process is heavy using two-stage
Shallow lake tandem process handles heavy metal wastewater thereby.Heavy metal chelating agent reactive tank is arranged on first stage precipitation tank rear end, and heavy metal
Agent for capturing reaction slot structure is not made to change, and structure is identical as shown in figure 3.Since metal hydroxides sludge is in first stage precipitation tank
Middle precipitation separation, heavy metal chelating agent can pointedly be reacted with low concentration solubilised state heavy metal ion remaining in waste water.
But added under reactive mode such, it is formed by insoluble matter number since heavy metal chelating agent is reacted with heavy metal ion
Measure less, these insoluble matters are not easy to be separated from the water so that removal of heavy metal ions rate is relatively low, effluent quality is unstable.
For disadvantages mentioned above of the existing technology, it is necessary to improve the structure shape of existing heavy metal chelating agent reactive tank
Formula reduces heavy metal chelating agent dosage, to reduce wastewater treatment running cost under the premise of ensureing to discharge water water quality reaching standard
With；Strengthen the sedimentation point that heavy metal chelating agent reacts the small amount insoluble matter to be formed with low-concentration heavy metal ions in waste water simultaneously
From effect, removal of heavy metal ions rate is improved.
In the case where not adjusted to common heavy metal waste water treatment process flow shown in Fig. 2, weight is only improved
The structure type of metal agent for capturing reactive tank can solve the above problems, and compare common sewage treatment technology process shown in Fig. 4,
It is simpler and effluent quality is more stable.
Invention content
The object of the present invention is to provide a kind of new heavy metal chelating agent reactive tanks.The reaction slot structure is ensureing to discharge water
Under the premise of water quality reaching standard, heavy metal chelating agent dosage is reduced, to reduce wastewater treatment operating cost.Strengthen a huge sum of money simultaneously
Belong to the sedimentation separation effect that agent for capturing reacts the small amount insoluble matter to be formed with low-concentration heavy metal ions in waste water, improves a huge sum of money
Belong to ion remaval rate.Using the new heavy metal chelating agent reactive tank, heavy metal waste water treatment process flow is simpler, goes out
Water water quality is more stablized.
To achieve the goals above, the present invention uses following technical scheme.
A kind of heavy metal chelating agent reactive tank, including：Sludge collecting tank, is arranged in first order reaction slot first order reaction slot
First order reaction slot blender, second order reaction slot, the second order reaction slot blender being arranged in second order reaction slot and be connected to
Sludge delivery pump between sludge collecting tank and second order reaction slot, wherein：Sludge collecting tank, first order reaction slot and second order reaction slot
Three slots are connected in series；Partition board top between sludge collecting tank and first order reaction slot is provided with trepanning, sludge collecting tank and level-one
Reactive tank realizes unicom by partition board top trepanning；The lower partition between first order reaction slot and second order reaction slot is provided with
Trepanning, first order reaction slot realize unicom with second order reaction slot by the lower partition trepanning；Heavy metal chelating agent reactive tank
Water inlet is located at the middle part of sludge collecting tank；The water outlet of heavy metal chelating agent reactive tank is located at the top of second order reaction slot,
Described in water outlet be higher than the water inlet；The lower part of sludge collecting tank is cone bucket formula structure, and bottom is provided with trepanning and leads to
The input end of piping and sludge delivery pump connects；The bottom of second order reaction slot is provided with trepanning and is conveyed by pipeline and sludge
The outlet end of pump connects.
According to an embodiment of the invention, the sludge delivery pump flow of heavy metal chelating agent reactive tank is influent waste water flow
5~20%。
Heavy metal chelating agent in heavy metal chelating agent reactive tank adds 10 ~ 60mg/L of concentration.
The water inlet of the heavy metal chelating agent reactive tank is connected with the neutralization reaction slot of front end, the heavy metal chelating agent
The water outlet of reactive tank and the coagulating slot of rear end and flocculation reaction slot cascade.
Feeding lime breast in neutralization reaction slot, it is 9.5 ~ 10.5 to adjust pH value of waste water.Dosing coagulant in coagulating slot
For PB1 gene, 100 ~ 200mg/L of concentration is added.It is polyacrylamide PAM that flocculant is added in flocculation reaction slot, is thrown
Add 2 ~ 5mg/L of concentration.
The present invention also provides a kind of process for treating heavy-metal waste water using heavy metal chelating agent reactive tank, the heavy metals
Agent for capturing reactive tank includes：Cone bucket formula sludge collecting tank, first order reaction slot, the first order reaction slot that is arranged in first order reaction slot stir
It mixes machine, second order reaction slot, the second order reaction slot blender being arranged in second order reaction slot and is connected to sludge collecting tank and two
Sludge delivery pump between order reaction slot, wherein：Cone bucket formula sludge collecting tank, first order reaction slot and the series connection of three slot of second order reaction slot
It is connected；Partition board top between cone bucket formula sludge collecting tank and first order reaction slot is provided with trepanning, cone bucket formula sludge collecting tank with
First order reaction slot realizes unicom by partition board top trepanning；The lower partition between first order reaction slot and second order reaction slot is set
It is equipped with trepanning, first order reaction slot realizes unicom with second order reaction slot by the lower partition trepanning；Heavy metal chelating agent reacts
The water inlet of slot is located at the middle part of cone bucket formula sludge collecting tank；The water outlet of heavy metal chelating agent reactive tank is located at second order reaction slot
Top, wherein the water outlet be higher than the water inlet；The bottom of cone bucket formula sludge collecting tank is provided with trepanning and passes through pipe
The input end of road and sludge delivery pump connects；The bottom of second order reaction slot is provided with trepanning and by pipeline and sludge delivery pump
Outlet end connects,
The process for treating heavy-metal waste water includes the following steps：
S1：Heavy metal wastewater thereby containing metal hydroxides sludge flows into cone bucket formula sludge collecting tank, the gold in heavy metal wastewater thereby
Belong to hydroxide sludge to settle under the effect of gravity, be collected in the lower part cone bucket of cone bucket formula sludge collecting tank, containing a small amount of
The spacing board top that the heavy metal wastewater thereby of remaining solubilised state heavy metal ion passes through cone bucket formula sludge collecting tank and first order reaction slot
Trepanning flow into first order reaction slot in；
S2：Heavy metal chelating agent is launched into first order reaction slot, under the action of first order reaction slot blender, heavy metal chelating agent
It is sufficiently mixed with heavy metal wastewater thereby, heavy metal chelating agent carries out anti-with solubilised state heavy metal ion remaining in heavy metal wastewater thereby
It answers, forms insoluble matter；
S3：Trepanning of the heavy metal wastewater thereby through the lower partition between first order reaction slot and second order reaction slot in first order reaction slot flows into
Second order reaction slot；
S4：Collect metal hydroxides sludge in the cone bucket of cone bucket formula sludge collecting tank lower part be set sludge collecting tank with
Sludge delivery pump between second order reaction slot is delivered to second order reaction slot；
S5：Under the action of second order reaction slot blender, the heavy metal wastewater thereby and metal after heavy metal chelating agent reaction have been added
Hydroxide sludge is sufficiently mixed in second order reaction slot；The works such as sweep by the absorption of high concentration metal hydroxides, package, volume
With the insoluble matter formed in step S2 is migrated from water to the surface of metal hydroxides sludge or inside, generates co-sedimentation effect
It answers, the solubilised state heavy metal ion in heavy metal wastewater thereby is thus enable to remove；
S6：The water outlet of heavy metal chelating agent reactive tank is further by the coagulation in coagulation tank, flocculation tank, flocculation reaction, heavy
Mud-water separation is carried out in the pond of shallow lake；The remaining insoluble matter of removal is retained using filter, thus removes the huge sum of money in heavy metal wastewater thereby
Belong to.
Heavy metal chelating agent reactive tank using the present invention and substantially reduce drop using its process for treating heavy-metal waste water
Low heavy metal agent for capturing dosage, reduces the operating cost of wastewater treatment.Simultaneously strengthen heavy metal chelating agent with it is low dense in waste water
Degree heavy metal ion reacts the sedimentation separation effect for the small amount insoluble matter to be formed, and improves removal of heavy metal ions rate.Use this
New heavy metal chelating agent reactive tank, heavy metal waste water treatment process flow is simpler, and effluent quality is more stablized.
Description of the drawings
Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, other feature of the invention,
Objects and advantages will become more apparent upon.
Fig. 1 is existing heavy metal waste water treatment process one；
Fig. 2 is existing heavy metal waste water treatment process two；
Fig. 3 is existing heavy metal chelating agent reactive tank；
Fig. 4 is existing heavy metal waste water treatment process three；
Fig. 5 is the heavy metal chelating agent reactive tank of the present invention,
In attached drawing：1-1 is heavy metal chelating agent reactive tank, and 1-2 is blender；2-1 is sludge collecting tank, and 2-2 is first order reaction
Slot, 2-3 are first order reaction slot blender；2-4 is second order reaction slot, and 2-5 is second order reaction slot blender, and 2-6 conveys for sludge
Pump.
Specific implementation mode
Technical scheme of the present invention is specifically described below in conjunction with Figure of description.
Describe the detailed features and advantage of the present invention in detail in a specific embodiment below, content is enough to make any
Skilled in the art realises that the technology contents of the present invention and implement according to this, and specification disclosed by this specification, weigh
Profit requires and attached drawing, skilled person readily understands that the relevant purpose of the present invention and advantage.
Fig. 5 shows the structure of heavy metal chelating agent reactive tank according to the present invention.As shown in Fig. 5, a huge sum of money of the invention
Belonging to agent for capturing reactive tank includes：It is anti-by sludge collecting tank, first order reaction slot, first order reaction slot blender, second order reaction slot, two level
The integrated apparatus for answering slot blender and sludge delivery pump to form.Sludge collecting tank, first order reaction slot and second order reaction slot are three
Slot is connected, the partition board top trepanning unicom of sludge collecting tank and first order reaction slot, the partition board of first order reaction slot and second order reaction slot
Lower part trepanning unicom.The water inlet of heavy metal chelating agent reactive tank is located at the middle part of sludge collecting tank.Heavy metal chelating agent reacts
The water outlet of slot is located at the top of second order reaction slot.First order reaction slot and second order reaction slot are equipped with blender.Sludge collecting tank
Lower part is cone bucket formula structure, and bottom opening is simultaneously connected by the import of pipeline and sludge delivery pump.Second order reaction trench bottom is opened
Hole is simultaneously connected by the outlet of pipeline and sludge delivery pump.
Process for treating heavy-metal waste water using heavy metal chelating agent reactive tank of the present invention includes the following steps：
（1）The process for treating heavy-metal waste water of the present invention is as shown in Fig. 2, wherein heavy metal chelating agent reactive tank is as shown in Figure 5.Weight
Metallic wastewater is in front end neutralization reaction slot after adding alkali neutralization, and the heavy metal ion of most of solubilised state reacts life with alkali in waste water
At insoluble petal hydroxide, sludge is formed.
（2）Heavy metal wastewater thereby containing metal hydroxides sludge enters the heavy metal chelating agent reactive tank that the present invention designs
（Figure is as shown in Figure 5）.Heavy metal wastewater thereby flows into sludge collecting tank first, and the metal hydroxides sludge in waste water is in gravitational settling
It is collected under effect in the cone bucket of lower part, the waste water containing remaining a small amount of solubilised state heavy metal ion is flowed into through the trepanning of partition board top
First order reaction slot.
（3）Heavy metal chelating agent is added in first order reaction slot, under the action of first order reaction slot blender, heavy metal is caught
It catches agent to be sufficiently mixed with waste water, and is reacted with the heavy metal ion of remaining a small amount of solubilised state in waste water, form insoluble matter.
（4）Waste water in first order reaction slot flows into second order reaction slot through the lower partition trepanning.
（5）Metal hydroxides sludge in the cone bucket of sludge collecting tank lower part is delivered to second order reaction through sludge delivery pump
Slot.
（6）Under the action of second order reaction slot blender, the waste water after heavy metal chelating agent reaction has been added and through sludge
The metal hydroxides sludge that delivery pump is delivered to second order reaction slot is sufficiently mixed in second order reaction slot；Pass through high concentration metal
The effects that absorption of hydroxide, package, volume are swept, above（3）The insoluble matter of middle formation is migrated from water to metal hydroxides
The surface or inside of sludge generate co-sedimentation effect, the solubilised state heavy metal ion in waste water are enable to remove.
（7）The water outlet of heavy metal chelating agent reactive tank is in turn by the coagulation in coagulation tank, flocculation tank, flocculation reaction, heavy
Mud-water separation is carried out in the pond of shallow lake；The remaining insoluble matter of removal is retained using filter so that the heavy metal in waste water is removed.
According to the present invention, heavy metal waste water treatment process parameter is as follows：
（1）Feeding lime breast in neutralization reaction slot, it is 9.5 ~ 10.5 to adjust pH value of waste water；
（2）Heavy metal chelating agent is added in heavy metal chelating agent reactive tank, adds 10 ~ 60mg/L of concentration；
（3）Heavy metal chelating agent reactive tank sludge delivery pump flow is the 5 ~ 20% of influent waste water flow；
（4）Dosing coagulant in coagulating slot（Aluminium polychloride, PAC）, add 100 ~ 200mg/L of concentration；
（5）Flocculant is added in flocculation reaction slot（Polyacrylamide, PAM）, add 2 ~ 5mg/L of concentration.
The present invention improves going for heavy metal ions in wastewater by improving the structure type of heavy metal chelating agent reactive tank
Except effect.
In the present invention, by established metal hydroxides sludge and remaining solubilised state first in sludge collecting tank
Separation of heavy metal ions；Then heavy metal chelating agent is added in first order reaction slot, it is possible thereby to pointedly with heavy metal
Remaining solubilised state heavy metal ion carries out catching reaction in waste water；Insoluble matter is formed by second order reaction slot and passes through dirt
The metal hydroxides sludge that mud delivery pump is delivered in second order reaction slot is mixed, dirty by high concentration metal hydroxides
The effects that absorption of mud, package, volume are swept, heavy metal chelating agent react the insoluble matter to be formed and are migrated from water to metal hydroxides
The surface or inside of sludge generate co-sedimentation effect, the heavy metal ion in waste water are enable to remove.
The present invention solves the remaining low concentration solubilised state heavy metal ion efficiency of heavy metal chelating agent removal in the prior art
It is relatively low and be formed by the problem of insoluble matter is not easy to be separated from the water, and integrated artistic route is simple.
Embodiment 1：
Heavy metal chelating agent reactive tank using the present invention（Fig. 5）And use its process for treating heavy-metal waste water（Fig. 2）It is right
The pickling waste waters of enterprises of producing stainless steel hot rolling mill is handled, and heavy metal in waste water component is mainly chromium and nickel.Concrete operations
Parameter is as follows：
（1）Total chromium concn is 234mg/L in raw wastewater, total nickel concentration is 807mg/L, pH value 1；
（2）Feeding lime breast in neutralization reaction slot, it is 10 to adjust pH value of waste water；
（3）Heavy metal chelating agent is added in heavy metal chelating agent reactive tank, adds concentration 40mg/L；
（4）Heavy metal chelating agent reactive tank sludge delivery pump flow is the 15% of influent waste water flow；
（5）Dosing coagulant in coagulating slot（Aluminium polychloride, PAC）, add concentration 100mg/L；
（6）Flocculant is added in flocculation reaction slot（Polyacrylamide, PAM）, add concentration 3mg/L；
（7）In water outlet that treated, total chromium concn is 0.035mg/L, total nickel concentration is 0.028mg/L, is met《Steel and iron industry
Pollution discharge standard》（GB 13456-2012）The emission request of middle table 3（Total chromium ＜ 0.1mg/L, total nickel ＜ 0.05mg/
L）.
Comparative example 1
For stainless steel hot-rolling pickling waste waters in embodiment 1, using common heavy metal chelating agent reactive tank（Fig. 3）And include it
Process for treating heavy-metal waste water（Attached drawing 2）It is handled.In processing raw water quality, neutralization reaction slot water outlet pH value, heavy metal
In the case that agent for capturing adds concentration, coagulant dosage concentration and flocculant concentration concentration all same, in water outlet that treated, always
Chromium concn is 0.114mg/L, total nickel concentration is 0.085mg/L, is unsatisfactory for《Steel and iron industry pollution discharge standard》（GB
13456-2012）The emission request of middle table 3.
Embodiment 2
Using heavy metal chelating agent reactive tank of the present invention（Fig. 5）And include its process for treating heavy-metal waste water（Fig. 2）To stainless
The pickling waste waters of steel manufacturing enterprise cold rolling mill is handled, and heavy metal in waste water component is mainly chromium and nickel.Concrete operations parameter
It is as follows：
（1）A concentration of 185mg/L of total Chromium in Waste, total nickel concentration be 283mg/L, pH value 2；
（2）Feeding lime breast in neutralization reaction slot, adjusting water outlet pH value are 10；
（3）Heavy metal chelating agent is added in heavy metal chelating agent reactive tank, adds concentration 25mg/L；
（4）Heavy metal chelating agent reactive tank sludge delivery pump flow is the 15% of influent waste water flow；
（5）Dosing coagulant in coagulating slot（Aluminium polychloride, PAC）, add concentration 100mg/L；
（6）Flocculant is added in flocculation reaction slot（Polyacrylamide, PAM）, add concentration 3mg/L；
（7）In water outlet that treated, total chromium concn is 0.013mg/L, total nickel concentration is 0.012mg/L, is met《Steel and iron industry
Pollution discharge standard》（GB 13456-2012）The emission request of middle table 3（Total chromium ＜ 0.1mg/L, total nickel ＜ 0.05mg/
L）.
Comparative example 2
For stainless steel cold-rolling pickling wastewater in embodiment 2, using common heavy metal chelating agent reactive tank（Fig. 3）And include it
Process for treating heavy-metal waste water（Attached drawing 2）It is handled.In processing raw water quality, neutralization reaction slot water outlet pH value, heavy metal
In the case that agent for capturing adds concentration, coagulant dosage concentration and flocculant concentration concentration all same, in processing water outlet, total chromium is dense
Degree is 0.103mg/L, total nickel concentration is 0.072mg/L, is unsatisfactory for《Steel and iron industry pollution discharge standard》（GB 13456-
2012）The emission request of middle table 3.
Comparative example 3
For stainless steel cold-rolling pickling wastewater in embodiment 2, using common heavy metal chelating agent reactive tank（Fig. 3）And include it
Process for treating heavy-metal waste water（Attached drawing 2）It is handled.In processing raw water quality, neutralization reaction slot water outlet pH value, coagulant
In the case of adding concentration and flocculant concentration concentration all same, when heavy metal chelating agent being added concentration improving to 120mg/L,
In processing water outlet, total chromium concn is 0.055mg/L, total nickel concentration is 0.022mg/L, is met《Steel and iron industry Sewage Water Emissions
Standard》（GB 13456-2012）The emission request of middle table 3.
As seen from the above comparison, in the premise for the discharge of wastewater requirement for meeting steel and iron industry pollution discharge standard
Under, using the invention of the present invention, the concentration that adds of heavy metal chelating agent is only 25mg/L in heavy metal chelating agent reactive tank, and is adopted
120mg/L is then needed with the concentration that adds of the prior art, heavy metal chelating agent.Therefore, the method for the invention can substantially reduce
Heavy metal chelating agent dosage reduces the operating cost of wastewater treatment.
Finally it is pointed out that although the present invention is described with reference to current specific embodiment, this technology is led
Those of ordinary skill in domain it should be appreciated that more than embodiment be intended merely to illustrate the present invention, and be not used as to this
The restriction of invention can also make various equivalent change or replacement without departing from the inventive concept of the premise, therefore, as long as
The variation, modification of above-described embodiment will all be fallen in claims of the present invention range in the spirit of the present invention
It is interior.
Claims (14)
1. a kind of heavy metal chelating agent reactive tank, which is characterized in that the heavy metal chelating agent reactive tank includes：Sludge is collected
Slot, the first order reaction slot blender being arranged in first order reaction slot, second order reaction slot, is arranged in second order reaction first order reaction slot
Second order reaction slot blender in slot and the sludge delivery pump being connected between sludge collecting tank and second order reaction slot, wherein：
Sludge collecting tank, first order reaction slot and three slot of second order reaction slot are connected in series；
Partition board top between sludge collecting tank and first order reaction slot is provided with trepanning, and sludge collecting tank passes through with first order reaction slot
Unicom is realized in partition board top trepanning；
The lower partition between first order reaction slot and second order reaction slot is provided with trepanning, and first order reaction slot passes through with second order reaction slot
Unicom is realized in the lower partition trepanning；
The water inlet of heavy metal chelating agent reactive tank is located at the middle part of sludge collecting tank；
The water outlet of heavy metal chelating agent reactive tank is located at the top of second order reaction slot, wherein the water outlet is higher than the water inlet
Mouthful；
The lower part of sludge collecting tank is cone bucket formula structure, and bottom is provided with trepanning and by the import of pipeline and sludge delivery pump
End connection；
The bottom of second order reaction slot is provided with trepanning and is connected by the outlet end of pipeline and sludge delivery pump.
2. heavy metal chelating agent reactive tank as described in claim 1, it is characterised in that：The sludge of heavy metal chelating agent reactive tank
Convey 5 ~ 20% that pump discharge is influent waste water flow.
3. heavy metal chelating agent reactive tank as described in claim 1, it is characterised in that：Weight in heavy metal chelating agent reactive tank
Metal agent for capturing adds 10 ~ 60mg/L of concentration.
4. heavy metal chelating agent reactive tank as described in claim 1, it is characterised in that：The heavy metal chelating agent reactive tank
Water inlet be connected with the neutralization reaction slot of front end, the coagulating of the water outlet and rear end of the heavy metal chelating agent reactive tank
Slot and the cascade of flocculation reaction slot.
5. heavy metal chelating agent reactive tank as claimed in claim 4, it is characterised in that：Feeding lime breast in neutralization reaction slot,
It is 9.5 ~ 10.5 to adjust pH value of waste water.
6. heavy metal chelating agent reactive tank as claimed in claim 4, it is characterised in that：Dosing coagulant is in coagulating slot
PB1 gene adds 100 ~ 200mg/L of concentration.
7. heavy metal chelating agent reactive tank as claimed in claim 4, it is characterised in that：Adding flocculant in flocculation reaction slot is
Polyacrylamide PAM adds 2 ~ 5mg/L of concentration.
8. a kind of process for treating heavy-metal waste water using heavy metal chelating agent reactive tank, which is characterized in that the heavy metal is caught
Catching agent reactive tank includes：Cone bucket formula sludge collecting tank, first order reaction slot, the first order reaction slot stirring being arranged in first order reaction slot
Machine, second order reaction slot, the second order reaction slot blender being arranged in second order reaction slot and it is connected to sludge collecting tank and two level
Sludge delivery pump between reactive tank, wherein：Cone bucket formula sludge collecting tank, first order reaction slot and three slot of second order reaction slot series connection phase
Even；Partition board top between cone bucket formula sludge collecting tank and first order reaction slot is provided with trepanning, cone bucket formula sludge collecting tank and one
Order reaction slot realizes unicom by partition board top trepanning；The lower partition setting between first order reaction slot and second order reaction slot
There are trepanning, first order reaction slot to realize unicom by the lower partition trepanning with second order reaction slot；Heavy metal chelating agent reactive tank
Water inlet be located at the middle part of cone bucket formula sludge collecting tank；The water outlet of heavy metal chelating agent reactive tank is located at second order reaction slot
Top, wherein the water outlet is higher than the water inlet；The bottom of cone bucket formula sludge collecting tank is provided with trepanning and passes through pipeline
It is connect with the input end of sludge delivery pump；The bottom of second order reaction slot is provided with trepanning and going out by pipeline and sludge delivery pump
The connection of mouth end,
The process for treating heavy-metal waste water includes the following steps：
S1：Heavy metal wastewater thereby containing metal hydroxides sludge flows into cone bucket formula sludge collecting tank, the gold in heavy metal wastewater thereby
Belong to hydroxide sludge to settle under the effect of gravity, be collected in the lower part cone bucket of cone bucket formula sludge collecting tank, containing a small amount of
The spacing board top that the heavy metal wastewater thereby of remaining solubilised state heavy metal ion passes through cone bucket formula sludge collecting tank and first order reaction slot
Trepanning flow into first order reaction slot in；
S2：Heavy metal chelating agent is launched into first order reaction slot, under the action of first order reaction slot blender, heavy metal chelating agent
It is sufficiently mixed with heavy metal wastewater thereby, heavy metal chelating agent carries out anti-with solubilised state heavy metal ion remaining in heavy metal wastewater thereby
It answers, forms insoluble matter；
S3：Trepanning of the heavy metal wastewater thereby through the lower partition between first order reaction slot and second order reaction slot in first order reaction slot flows into
Second order reaction slot；
S4：Collect metal hydroxides sludge in the cone bucket of cone bucket formula sludge collecting tank lower part be set sludge collecting tank with
Sludge delivery pump between second order reaction slot is delivered to second order reaction slot；
S5：Under the action of second order reaction slot blender, the heavy metal wastewater thereby and metal after heavy metal chelating agent reaction have been added
Hydroxide sludge is sufficiently mixed in second order reaction slot；The works such as sweep by the absorption of high concentration metal hydroxides, package, volume
With the insoluble matter formed in step S2 is migrated from water to the surface of metal hydroxides sludge or inside, generates co-sedimentation effect
It answers, the solubilised state heavy metal ion in heavy metal wastewater thereby is thus enable to remove；
S6：The water outlet of heavy metal chelating agent reactive tank is further by the coagulation in coagulation tank, flocculation tank, flocculation reaction, heavy
Mud-water separation is carried out in the pond of shallow lake；The remaining insoluble matter of removal is retained using filter, thus removes the huge sum of money in heavy metal wastewater thereby
Belong to.
9. process for treating heavy-metal waste water as claimed in claim 8, it is characterised in that：The sludge of heavy metal chelating agent reactive tank
Convey 5 ~ 20% that pump discharge is influent waste water flow.
10. process for treating heavy-metal waste water as claimed in claim 8, it is characterised in that：In heavy metal chelating agent reactive tank
Heavy metal chelating agent adds 10 ~ 60mg/L of concentration.
11. process for treating heavy-metal waste water as claimed in claim 8, it is characterised in that：It can the heavy metal chelating agent reaction
The water inlet of slot is connected with the neutralization reaction slot of front end, by the coagulation of the water outlet and rear end of the heavy metal chelating agent reactive tank
Reactive tank and the cascade of flocculation reaction slot.
12. process for treating heavy-metal waste water as claimed in claim 11, it is characterised in that：Feeding lime in neutralization reaction slot
Breast, it is 9.5 ~ 10.5 to adjust pH value of waste water.
13. process for treating heavy-metal waste water as claimed in claim 11, it is characterised in that：Dosing coagulant in coagulating slot
For PB1 gene, 100 ~ 200mg/L of concentration is added.
14. process for treating heavy-metal waste water as claimed in claim 11, it is characterised in that：Flocculant is added in flocculation reaction slot
For polyacrylamide PAM, 2 ~ 5mg/L of concentration is added.
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| CN110040889A (en) * | 2019-05-06 | 2019-07-23 | 安徽科技学院 | A kind of sewage-treatment plant based on heavy metal pollution |
| CN111233204A (en) * | 2020-03-09 | 2020-06-05 | 上海东振环保工程技术有限公司 | Acidic heavy metal wastewater treatment device and process |
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| CN108439666B (en) | 2018-11-02 |
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