CN106082452B - A kind of preparation of advanced treatment of electroplating waste - Google Patents
A kind of preparation of advanced treatment of electroplating waste Download PDFInfo
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- CN106082452B CN106082452B CN201610624797.1A CN201610624797A CN106082452B CN 106082452 B CN106082452 B CN 106082452B CN 201610624797 A CN201610624797 A CN 201610624797A CN 106082452 B CN106082452 B CN 106082452B
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
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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
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/46104—Devices therefor; Their operating or servicing
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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
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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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/16—Nature of the water, waste water, sewage or sludge to be treated from metallurgical processes, i.e. from the production, refining or treatment of metals, e.g. galvanic wastes
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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
Abstract
The present invention relates to a kind of preparations of advanced treatment of electroplating waste, the preparation includes flocculant and composite bacteria agent, the flocculant are as follows: compounded according to diatomite, hydrogen peroxide, aluminium polychloride, inorganic cerium salt by the weight ratio of 5:3:2:2, the inorganic cerium salt can choose the one or several kinds of cerous nitrate, cerous sulfate or cerium hydroxide.Invention formulation improves the processing water and water quality treatment of electroplating wastewater, reduces operating cost, and discharge water quality is promoted to reach standard.
Description
Technical field
The invention belongs to technical field of waste water processing, and in particular to a kind of preparation of advanced treatment of electroplating waste.
Background technique
Electroplating industry is usually broadly divided into cyanide wastewater, chromate waste water, heavy metal wastewater thereby and soda acid according to pollutant kind
Waste water, wherein for chromate waste water containing cyanogen due to cyanide and Cr VI containing severe toxicity, the untreated water body up to standard that is just discharged into can be right
Aquatile causes damages.Under normal circumstances, independent processing need to be collected separately containing cyanogen and chromate waste water, because of sexavalence in chromate waste water
It is acidity that chromium, which handles pH, and generally 2 ~ 3, chemical precipitation again need to be restored with reducing agent, and cyanide wastewater pH is needed under alkaline condition,
Generally 10 ~ 11, with hypochlorite oxidation cyanide, then pH to 7 ~ 8 is adjusted to continue broken cyanide, then discharged.And enterprise is electroplated in reality
Industry is difficult that water quality is completely separable, is often mixed in cyanide or cyanide wastewater in chromate waste water often containing Cr VI or trivalent
Chromium, waste water ratio is more intractable after mixing, and especially Some Enterprises are thoroughly mixed, and a large amount of molysite, iron easy to form are also contained in waste water
Cyanide, be the oxidations such as sodium hypochlorite not, further increase processing difficulty, often cyanide and total chromium is not up to standard.
According to statistics, electroplating industry average annual waste water yield in China's is up to 4,000,000,000 tons, and the 1/6 of the total discharged volume of industrial waste water of Zhan.
Simultaneously as the complexity of electroplating technology, causes the waste component generated complicated and changeable, pollutant concentration is high, it is difficult to reach day
The discharge standard for becoming stringent.As electroplating wastewater discharge standard and reclamation rate requirement are further stringent, therefore, it is necessary to carry out to waste water
Advanced treating makes it meet reuse water quality requirement.
The prior art is generally following several to the processing method of electroplating wastewater:
1, solvent extraction
Solvent extraction is that heavy metal is concentrated in organic phase and the difference of solubility in water using heavy metal ion
In the separation method of organic phase.Organic phase is also referred to as extractant, common are tributyl phosphate, trioctylphosphine oxide, diformazan heptyl
Acetamide, trioctylamine, primary amine, oleic acid and linoleic acid etc..In addition, organic extractant is also answered extensively in metal form analysis
With, such as acetone, ethyl alcohol.Solvent extraction processing heavy metal wastewater thereby equipment is simple, easy to operate, and addition extraction dosage is small, extraction
Take agent is recyclable to recycle, secondary pollution is small, is a kind of processing method for having very much development potentiality.
2, chemical precipitation method
Chemical precipitation method is the principle according to solubility product, adds hydroxide, sulfide, carbonated etc., makes heavy metal
Ion and hydroxide ion, sulphion, carbanion etc. combine and form insoluble compound.Although technique is relatively simple, operation
Also it is easier, but influence of this method vulnerable to precipitating reagent and environmental condition, make aqueous concentration that discharge standard be not achieved.In addition,
If a large amount of waste residues that reaction generates are not handled well, it is easy to produce secondary pollution, does not meet environmentally protective original
Then.
3, ion-exchange
Ion-exchange is the process that ion exchange occurs for heavy metal ion and ion exchange resin, resin property counterweight
Metal removal has larger impact.Common ion exchange resin has cation exchange resin, anion exchange resin, chelating resin
With Humic Acid Resin etc..Ion-exchange is to be optionally removed heavy metal ion, simple process, easy to operate, removal effect
Very well.Compared with the precipitation method and electrolysis method, ion-exchange has certain advantage in terms of the wastewater treatment of low concentration, but should
Method by resin adsorption capacity, useless impurities in water is influenced and the limitation of exchanger kind, yield and cost, and to waste water
Pre-processing requirements are higher, and regeneration of ion-exchange resin and the processing of regenerated liquid are also an insoluble problem.
4, absorption method
Absorption method is substantially attraction of the adsorbent activity surface to heavy metal ion, is to utilize porous solid substance
Suction-operated makes the heavy metal ion adsorbed a kind of method removed in solid adsorbent surfaces in waste water.Most common suction
Attached dose is active carbon, but it is expensive, and service life is short, needs to regenerate, and operating cost is high.In addition, absorption method processing is containing a huge sum of money
It is applied widely to belong to waste water, not will cause secondary pollution, but adsorbent is not often high to the adsorptive selectivity of heavy metal ion, no
It can be promoted well.
5, materialization+biochemistry
It is handled using materialization+biochemistry mode, due to using hypophosphite as reducing agent in electroplating wastewater, it is difficult to
Effectively precipitating causes total phosphorus concentration in biochemical tail water usually also to contain highly concentrated usually in 2-5mg/L, and after using calcium precipitation
The fluorine ion of degree, concentration range 10-20mg/L, it is difficult to reach increasingly stringent discharge standard
State Ministry of Environmental Protection requires electroplating industry that need to discharge according to GB21900-2008 " discharge standard for electroplating pollutants ", makes
With the electroplating wastewater of conventional processing method processes composition complexity, it is difficult to shunt thorough, it is difficult to up to standard, biochemical difficulty is handled, or
It needing through transformation of facility or multistep treatment etc., such drug dosage is big, and technique repetition generation sludge is also more, at high cost,
It is difficult to ensure the qualified discharge of waste water.Therefore, develop that a kind of construction investment is few, operating cost is low, the plating of good treatment efficiency is useless
Water treatment technology is this field technical problem urgently to be solved.
Summary of the invention
The object of the present invention is to provide a kind of preparations of advanced treatment of electroplating waste
The present invention is achieved by the following technical scheme:
A kind of preparation of advanced treatment of electroplating waste, the preparation include flocculant and composite bacteria agent
The flocculant are as follows: multiple by the weight ratio of 5:3:2:2 according to diatomite, hydrogen peroxide, aluminium polychloride, inorganic cerium salt
With forming.
The inorganic cerium salt can choose the one or several kinds of cerous nitrate, cerous sulfate or cerium hydroxide.
The composite bacteria agent is prepared as follows:
(1) peanut shell is put into pulverizer, smashes it through 100 meshes and obtains peanut shell powder；
(2) by Rhodococcus ruber, Clostridium papyrosolvens, Paracoccus denitrificans, Thiobacillus ferrooxidans cultivate respectively to concentration be 1 ×
107Then the bacterium solution of a/ml mixes according to the volume ratio of 4:3:1:2, obtains mixed bacteria liquid；
The Rhodococcus ruber (Rhodococcus ruber) is ATCC15906；
The Clostridium papyrosolvens (Clostridium papyrosolvens) it is ATCC 700395；
The Paracoccus denitrificans (Paracoccus denitrificans) is ATCC13543
The Thiobacillus ferrooxidans (Thiobacillus ferrooxidans) be CGMCC NO.0727 (referring to
CN1375553A)；
(3) carrier is prepared:
10 parts of peanut shell powder that the carrier is prepared by step (1), 7 parts of chitosan, 5 parts of chitin, 20 parts of water, according to weight
Amount number takes above-mentioned raw materials to be added in stirred reactor, and 500 turns/min stirs 10min, stands 30min, is placed in 60 DEG C of bakings
Doing to moisture content is 5% to obtain the final product；
The carrier of the mixed bacteria liquid of step (2) preparation, step (3) preparation is mixed according to the mass ratio of 1:3, stirring is equal
Even, 30 DEG C of dryings to water content are 10% to get bacteria agent.
It uses the method for above-mentioned preparation advanced treatment of electroplating waste: including the following steps:
(1) electroplating wastewater is separated by solid-liquid separation, can effectively prevent generating in waste water transmission process by the operation stifled
Fill in phenomenon and damage equipment；
(2) step (1) is obtained into liquid and passes through micro-electrolysis reactor, it is interior to be equipped with anode and cathode, in the work of direct current
Under, iron anode constantly dissolve generate ferrous ion, in acid condition by hexavalent chrome reduction at trivalent chromium, and can effectively by
The complex compound of complex compound and heavy metal in waste water containing cyanogen is broken.
(3) 11 will be adjusted to by the wastewater pH of micro-electrolysis reactor, add sodium hypochlorite and sodium hydroxide, the hypochlorous acid
The weight ratio of sodium and sodium hydroxide is 1:2, and the additive amount of the two is 0.8% parts by weight, after reaction 20-30 minutes, by waste water
PH value is controlled in 6-7, then reacts 20-30min, after according to the ratio of 0.1g/L flocculant is added, carry out flocculation treatment, then into
Row staticly settles, and time 4-6h obtains clarified supernatant later；
(4) supernatant that step (3) processing obtains is discharged to microbial reaction pond, adjustings pH value is 7-8, then according to
Every cubic metre of liquid adds bacteria agent 10g, stands one week.
Strain of the present invention can be from China Committee for Culture Collection of Microorganisms's common micro-organisms center
(CGMCC) and American Type Culture collection warehousing (ATCC), Chinese agriculture Microbiological Culture Collection administrative center (ACCC) are purchased
It can buy.
Strain of the present invention and algae can obtain the bacterium solution or algae solution of required concentration by conventional cultural method,
The innovative point of this and non-present invention does not repeat one by one as space is limited.
Flocculant of the present invention passes through the catalysis oxidation class Fenton's reaction of hydrogen peroxide and inorganic cerium salt, so that in waste water first
Hypophosphite be converted into orthophosphates so that the phosphorus in water body is easy to be removed by coagulating sedimentation, solve
Lead to not the problems such as being effectively treated because of the morphology issues of phosphorus；Simultaneously as cerium salt and fluorine ion affinity are stronger, so that portion
Fluorine ion is divided to adsorb to be removed by cerium salt；And flocculant of the present invention is made using diatomite and aluminium polychloride cooperation
With, can synchronize removal water body in phosphate radical and fluorine ion, settling velocity is fast, high treating effect, and the sludge quantity of generation is small, symbol
Close the minimizing principle of solid waste.Flocculant of the present invention has good removal to act on to COD, phosphorus, the fluorine etc. in waste water, in use
It states flocculant and optimum synergistic effect is reached to waste water effect.
The present invention removes network using sodium hypochlorite and sodium hydroxide coordination, the removal rate of iron cyano complex is enhanced, so that iron
Cyano complex is gone out in the form precipitated by mud discharging.
The various strains that can form dominant microflora are configured to high-efficiency microorganism preparation, by one by composite bacteria agent of the invention
It is quantitatively added in waste water treatment system, accelerates the degradation of microbe, to improve the biological treatment efficiency of system, protect
Demonstrate,prove system stable operation.It contains there are many there is the microorganism of excellent degradation capability to Recalcitrant chemicals, between each strain rationally
Compatibility, symbiosis are coordinated, mutually not antagonism, and activity is high, and biomass is big, and breeding is fast, and suitable for the processing of electroplating wastewater, processing water can be improved
Amount and water quality treatment reduce operating cost, promote qualified discharge.
Specific embodiment
Embodiment 1:
A kind of preparation of advanced treatment of electroplating waste, the preparation include flocculant and composite bacteria agent；
The flocculant are as follows: multiple by the weight ratio of 5:3:2:2 according to diatomite, hydrogen peroxide, aluminium polychloride, inorganic cerium salt
With forming.
The inorganic cerium salt can choose the one or several kinds of cerous nitrate, cerous sulfate or cerium hydroxide.
Using the method for above-mentioned preparation advanced treatment of electroplating waste, include the following steps:
(1) electroplating wastewater is separated by solid-liquid separation, can effectively prevent generating in waste water transmission process by the operation stifled
Fill in phenomenon and damage equipment；
(2) step (1) is obtained into liquid by micro-electrolysis reactor, interior to be equipped with anode and cathode, iron anode is constantly molten
Solution generate ferrous ion, in acid condition by hexavalent chrome reduction at trivalent chromium, and can effectively by waste water containing the complexing of cyanogen
The complex compound of object and heavy metal is broken.
(3) 11 will be adjusted to by the wastewater pH of micro-electrolysis reactor, add sodium hypochlorite and sodium hydroxide, the hypochlorous acid
The weight ratio of sodium and sodium hydroxide is 1:2, and the additive amount of the two is 0.8% parts by weight, is reacted after twenty minutes, by the pH of waste water
Value control then reacts 20min 6, after according to the ratio of 0.1g/L flocculant is added, carry out flocculation treatment, then stood
Precipitating, time 4-6h obtain clarified supernatant later；
The flocculant are as follows: compounded according to diatomite, hydrogen peroxide, aluminium polychloride, cerous nitrate by the weight ratio of 5:3:2:2
It forms；
(4) supernatant that step (3) processing obtains is discharged to microbial reaction pond, adjusting pH value is 7, then according to often standing
Square rice liquid adds composite bacteria agent 10g, stands one week.
The composite bacteria agent is prepared as follows:
(1) peanut shell is put into pulverizer, smashes it through 100 meshes and obtains peanut shell powder；
(2) by Rhodococcus ruber, Clostridium papyrosolvens, Paracoccus denitrificans, Thiobacillus ferrooxidans cultivate respectively to concentration be 1 ×
107Then the bacterium solution of a/ml mixes according to the volume ratio of 4:3:1:2, obtains mixed bacteria liquid；
The Rhodococcus ruber (Rhodococcus ruber) is ATCC15906；
The Clostridium papyrosolvens (Clostridium papyrosolvens) it is ATCC 700395；
The Paracoccus denitrificans (Paracoccus denitrificans) is ATCC13543
The Thiobacillus ferrooxidans (Thiobacillus ferrooxidans) be CGMCC NO.0727 (referring to
CN1375553A)；
(3) carrier is prepared:
10 parts of peanut shell powder that the carrier is prepared by step (1), 7 parts of chitosan, 5 parts of chitin, 20 parts of water, according to weight
Amount number takes above-mentioned raw materials to be added in stirred reactor, and 500 turns/min stirs 10min, stands 30min, is placed in 60 DEG C of bakings
Doing to moisture content is 5% to obtain the final product；
The carrier of the mixed bacteria liquid of step (2) preparation, step (3) preparation is mixed according to the mass ratio of 1:3, stirring is equal
Even, 30 DEG C of dryings to water content are 10% to get bacteria agent.
Embodiment 2
A kind of preparation of advanced treatment of electroplating waste, the preparation include flocculant and composite bacteria agent
The flocculant are as follows: multiple by the weight ratio of 5:3:2:2 according to diatomite, hydrogen peroxide, aluminium polychloride, inorganic cerium salt
With forming.
The inorganic cerium salt can choose the one or several kinds of cerous nitrate, cerous sulfate or cerium hydroxide.
Using the method for above-mentioned preparation advanced treatment of electroplating waste, include the following steps:
(1) electroplating wastewater is separated by solid-liquid separation, can effectively prevent generating in waste water transmission process by the operation stifled
Fill in phenomenon and damage equipment；
(2) step (1) is obtained into liquid and passes through micro-electrolysis reactor, it is interior to be equipped with anode and cathode, in the work of direct current
Under, iron anode constantly dissolve generate ferrous ion, in acid condition by hexavalent chrome reduction at trivalent chromium, and can effectively by
The complex compound of complex compound and heavy metal in waste water containing cyanogen is broken.
(3) 11 will be adjusted to by the wastewater pH of micro-electrolysis reactor, add sodium hypochlorite and sodium hydroxide, the hypochlorous acid
The weight ratio of sodium and sodium hydroxide is 1:2, and the additive amount of the two is 0.8% parts by weight, after reaction 30 minutes, by the pH of waste water
Value control then reacts 30min 7, after according to the ratio of 0.1g/L flocculant is added, carry out flocculation treatment, then stood
Precipitating, time 6h obtain clarified supernatant later；
The flocculant are as follows: compounded according to diatomite, hydrogen peroxide, aluminium polychloride, cerous nitrate by the weight ratio of 5:3:2:2
It forms；
(4) supernatant that step (3) processing obtains is discharged to microbial reaction pond, adjusting pH value is 8, then according to often standing
Square rice liquid adds composite bacteria agent 10g, stands one week.
The composite bacteria agent is prepared as follows:
(1) peanut shell is put into pulverizer, smashes it through 100 meshes and obtains peanut shell powder；
(2) by Rhodococcus ruber, Clostridium papyrosolvens, Paracoccus denitrificans, Thiobacillus ferrooxidans cultivate respectively to concentration be 1 ×
107Then the bacterium solution of a/ml mixes according to the volume ratio of 4:3:1:2, obtains mixed bacteria liquid；
The Rhodococcus ruber (Rhodococcus ruber) is ATCC15906；
The Clostridium papyrosolvens (Clostridium papyrosolvens) it is ATCC 700395；
The Paracoccus denitrificans (Paracoccus denitrificans) is ATCC13543
The Thiobacillus ferrooxidans (Thiobacillus ferrooxidans) be CGMCC NO.0727 (referring to
CN1375553A)；
(3) carrier is prepared:
10 parts of peanut shell powder that the carrier is prepared by step (1), 7 parts of chitosan, 5 parts of chitin, 20 parts of water, according to weight
Amount number takes above-mentioned raw materials to be added in stirred reactor, and 500 turns/min stirs 10min, stands 30min, is placed in 60 DEG C of bakings
Doing to moisture content is 5% to obtain the final product；
The carrier of the mixed bacteria liquid of step (2) preparation, step (3) preparation is mixed according to the mass ratio of 1:3, stirring is equal
Even, 30 DEG C of dryings to water content are 10% to get bacteria agent.
Embodiment 3
Certain one batch electroplating wastewater of factory is handled using the method for embodiment 1, the results are shown in Table 1.
Table 1
| Before processing (mg/L) | After processing (mg/L) | Removal rate | |
| COD | 1308 | 15 | 98.8% |
| Total chromium | 27 | 0.2 | 99.2% |
| Cr6+ | 0.44 | 0.003 | 99.3% |
| Total cyanogen | 133 | 0.02 | 99.9% |
| Phosphorus | 8.7 | 0.12 | 98.6% |
| Fluorine | 9.8 | 0.4 | 95.9% |
Advanced treating is carried out to electroplating wastewater by the method for the present invention, in processed waste water, total phosphorus concentration is less than 0.5mg/
L, fluoride are less than 10mg/L, and total cyanide content is less than 0.2mg/L, compound 2008 " plating pollutant emission mark of GB21900-
It is quasi- ", there is good treatment effect.
Although above having made detailed explanation to this case with generality explanation and specific embodiment, at this
On the basis of invention, it can be made some modifications or improvements, this will be apparent to those skilled in the art.Therefore,
It is made without departing from theon the basis of the spirit of the present invention to modify or improve, it falls within the scope of the claimed invention.
Claims (3)
1. a kind of preparation of advanced treatment of electroplating waste, the preparation include flocculant and composite bacteria agent;
The flocculant are as follows: according to diatomite, hydrogen peroxide, aluminium polychloride, inorganic cerium salt by 5:3:2:2 weight ratio compounding and
At;The inorganic cerium salt is cerous nitrate, cerous sulfate or cerium hydroxide；
The composite bacteria agent is prepared as follows:
(1) peanut shell is put into pulverizer, smashes it through 100 meshes and obtains peanut shell powder；
(2) cultivating Rhodococcus ruber, Clostridium papyrosolvens, Paracoccus denitrificans, Thiobacillus ferrooxidans to concentration respectively is 1 × 107A/
Then the bacterium solution of ml mixes according to the volume ratio of 4:3:1:2, obtains mixed bacteria liquid；
(3) carrier is prepared:
10 parts of peanut shell powder, 7 parts of chitosan, 5 parts of chitin, 20 parts of water are taken according to parts by weight, are successively added to and are stirred to react
In device, 500 turns/min stirs 10min, stands 30min, and being placed in 60 DEG C and being dried to moisture content is 5% to obtain the final product；
(4) composite bacteria agent is prepared:
The carrier of the mixed bacteria liquid of step (2) preparation, step (3) preparation is mixed according to the mass ratio of 1:3, is stirred evenly, 30
It is DEG C dry to water content be 10% to get composite bacteria agent.
2. preparation according to claim 1, which is characterized in that
The Rhodococcus ruber (Rhodococcus ruber) is ATCC15906；
The Clostridium papyrosolvens (Clostridium papyrosolvens) it is ATCC 700395；
The Paracoccus denitrificans (Paracoccus denitrificans) is ATCC13543；
The Thiobacillus ferrooxidans (Thiobacillus ferrooxidans) is CGMCC NO.0727.
3. preparation according to claim 1, which is characterized in that the method using preparation advanced treatment of electroplating waste is as follows:
(1) electroplating wastewater is separated by solid-liquid separation, prevents from generating clogging in waste water transmission process；
(2) step (1) is obtained into liquid by micro-electrolysis reactor, interior to be equipped with anode and cathode, iron anode constantly dissolves production
Raw ferrous ion, in acid condition by hexavalent chrome reduction at trivalent chromium；
(3) 11 will be adjusted to by the wastewater pH of micro-electrolysis reactor, and add sodium hypochlorite and sodium hydroxide, the sodium hypochlorite and
The weight ratio of sodium hydroxide is 1:2, and the total amount of adding of the two is 0.8% parts by weight, after reaction 20-30 minutes, then by waste water
PH value is adjusted to 6-7, and flocculant is added according to the ratio of 0.1g/L after 20-30min, carries out flocculation treatment, is then stood
Precipitating, time 4-6h obtain clarified supernatant later；
(4) supernatant that step (3) processing obtains is discharged to microbial reaction pond, adjusting pH value is 7-8, then according to every cube
Rice liquid adds bacteria agent 10g, stands one week.
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| CN111606519A (en) * | 2020-06-09 | 2020-09-01 | 闫娟 | Advanced treatment method for electroplating wastewater |
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