CN105693003A - Treatment method for removing cadmium in electroplating wastewater - Google Patents
Treatment method for removing cadmium in electroplating wastewater Download PDFInfo
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- CN105693003A CN105693003A CN201610267551.3A CN201610267551A CN105693003A CN 105693003 A CN105693003 A CN 105693003A CN 201610267551 A CN201610267551 A CN 201610267551A CN 105693003 A CN105693003 A CN 105693003A
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- 239000002351 wastewater Substances 0.000 title claims abstract description 73
- 238000000034 method Methods 0.000 title claims abstract description 59
- 229910052793 cadmium Inorganic materials 0.000 title claims abstract description 49
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 title claims abstract description 49
- 238000009713 electroplating Methods 0.000 title claims abstract description 23
- 241001122767 Theaceae Species 0.000 claims abstract description 72
- 238000005273 aeration Methods 0.000 claims abstract description 47
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 45
- 238000005188 flotation Methods 0.000 claims abstract description 33
- 239000006260 foam Substances 0.000 claims abstract description 24
- WLZRMCYVCSSEQC-UHFFFAOYSA-N cadmium(2+) Chemical compound [Cd+2] WLZRMCYVCSSEQC-UHFFFAOYSA-N 0.000 claims abstract description 21
- 239000001397 quillaja saponaria molina bark Substances 0.000 claims abstract description 15
- 229930182490 saponin Natural products 0.000 claims abstract description 15
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- 238000010438 heat treatment Methods 0.000 claims abstract description 12
- 238000000746 purification Methods 0.000 claims abstract description 4
- 238000004062 sedimentation Methods 0.000 claims description 33
- 239000002699 waste material Substances 0.000 claims description 33
- 230000008569 process Effects 0.000 claims description 30
- 238000005202 decontamination Methods 0.000 claims description 29
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- 238000004065 wastewater treatment Methods 0.000 abstract description 4
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- 229910001385 heavy metal Inorganic materials 0.000 description 3
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- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
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- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
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- 241000245654 Gladiolus Species 0.000 description 1
- 241000489433 Isoetes lacustris Species 0.000 description 1
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- 241001465754 Metazoa Species 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 244000030765 Phaleria macrocarpa Species 0.000 description 1
- 208000031320 Teratogenesis Diseases 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 210000000081 body of the sternum Anatomy 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 235000011116 calcium hydroxide Nutrition 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 230000000711 cancerogenic effect Effects 0.000 description 1
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- 229910000514 dolomite Inorganic materials 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000011790 ferrous sulphate Substances 0.000 description 1
- 235000003891 ferrous sulphate Nutrition 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
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- 238000005342 ion exchange Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 1
- 229910000359 iron(II) sulfate Inorganic materials 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 230000004060 metabolic process Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
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- 229910021645 metal ion Inorganic materials 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
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- 231100000219 mutagenic Toxicity 0.000 description 1
- 230000003505 mutagenic effect Effects 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 230000008085 renal dysfunction Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 108010048734 sclerotin Proteins 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- HYHCSLBZRBJJCH-UHFFFAOYSA-M sodium hydrosulfide Chemical compound [Na+].[SH-] HYHCSLBZRBJJCH-UHFFFAOYSA-M 0.000 description 1
- 229910052979 sodium sulfide Inorganic materials 0.000 description 1
- GRVFOGOEDUUMBP-UHFFFAOYSA-N sodium sulfide (anhydrous) Chemical compound [Na+].[Na+].[S-2] GRVFOGOEDUUMBP-UHFFFAOYSA-N 0.000 description 1
- HUAUNKAZQWMVFY-UHFFFAOYSA-M sodium;oxocalcium;hydroxide Chemical compound [OH-].[Na+].[Ca]=O HUAUNKAZQWMVFY-UHFFFAOYSA-M 0.000 description 1
- 238000000638 solvent extraction Methods 0.000 description 1
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Classifications
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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
-
- 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
-
- 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
- C02F1/02—Treatment of water, waste water, or sewage by heating
-
- 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
- C02F1/24—Treatment of water, waste water, or sewage by flotation
-
- 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
-
- 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
-
- 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
-
- 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
-
- 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
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Physical Water Treatments (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
Abstract
The invention discloses a treatment method for removing cadmium in electroplating wastewater.Wastewater passes through a water-collecting well, a coarse screen, a primary settling tank, a pH value adjusting pool, a tea seed meal-aeration flotation purification system, a heating and contracting pool, an alkalizing and settling pool, a secondary pH value adjusting pool, a secondary settling pool and a water purifying pool to be treated.According to the treatment method, the cadmium ion flotation characteristic of tea saponin in tea seed meal is utilized creatively, in the condition that the pH value is 5.5-6.5, the saponin in the tea seed meal is combined with cadmium ions in the wastewater to form a molecular structure prone to air floatation, then a great number of air bubbles are introduced to the water through compressed air aeration, and the air bubbles carry the saponin combined with the cadmium ions to be floated on the water surface and gathered to form foams, so that the cadmium ions in the wastewater are removed in a targeted mode; meanwhile the tea seed meal is residues obtained after camellia seeds are subjected to oil expression, cost is low, the tea seed meal is easy to obtain, and material cost of wastewater treatment can be greatly lowered.
Description
Technical field
The present invention relates to and a kind of remove the processing method of cadmium in electroplating wastewater, belong to the field of waste water treatment in environmental conservation。
Background technology
Heavy metal pollution of water body becomes one of environmental problem of world today's common concern。Cadmium is heavy metal ion extremely common in industry plating wastewater。It is enriched with by food chain, brings high risks to animals and humans。Occur the local exactly aluminium manufacturer of " Itai-itai diseases " event at Japan folic hill that cadmium wastewater is entered water body, resident eats containing cadmium rice for a long time, drinks containing cadmium water, internal Cd accumulation is too much, causes the calcium in renal dysfunction, sclerotin to be replaced by cadmium, makes skeleton softening, fracture cause。Cadmium also carcinogenic, teratogenesis shape, mutagenic toxic action。
Existing mainly have three major types to the removal technology of cadmium in water environment: one is physical chemistry recovery technique, two is phytoremediation technology, three is bioremediation technology。
1, physical chemistry recovery technique
Physical chemistry recovery technique contains many concrete processing methods, such as precipitation, solvent extraction, ion exchange, membrance separation, absorption, neutralisation, oxidization by bleaching powder method, ferrum oxidation-precipitation method and metal deoxidization, electrolysis etc.。
(1) neutralization precipitation method: in the basic conditions, cadmium generates indissoluble, stable precipitate。Soda lime (CaO), slaked lime [Ca (OH)2], flying dust (pulverized limestone, CaO), the lime nertralizer such as dolomite (CaO&MgO) cheap, the cadmium ion in waste water can be removed, and technique is simple。But this method sediment weight is big, goes out water hardness height。
(2) sulphide precipitation: be added in waste water by vulcanizing agent, cadmium ion just precipitates out in sulfide precipitation, and conventional vulcanizing agent has Na2S、NaHS、H2S etc.。The sediment moisture content that sulfuration method produces is low, and not easily returns molten formation secondary precipitation。But vulcanizing agent price is high, is easily generated H in acid waste water2S and pollute the environment of surrounding, process in this way costly, be easily generated secondary pollution, be industrially difficult to extensive use。
(3) absorption method: absorption method is to utilize porous solid matter, makes one or more materials in water be attracted to the surface of solids and the method that removes。Absorption method process more containing the influence factor every waste water, as the granularity of adsorbent, the addition of adsorbent, the composition of waste water, waste water containing cadmium concentration, pH value, adsorption time etc., these all can increase the difficulty of practical operation。
(4) oxidization by bleaching powder method: the waste water that this method is only applicable to process in Qing Fa cadmium plating factory containing cyanogen, cadmium, the main component of this waste water is [Cd (CN)4]2-、Cd2+And CN-。Dominant response process in wastewater treatment is: first bleaching powder is hydrolyzed generation Cd (OH)2And HOC, OH-With Cd2+Generate Cd (OH)2Precipitation, the HOC that bleaching powder hydrolysis generates has strong oxidizing property, by CN-Oxidation generates CO3 2-And N2, promote [Cd (CN) 4]2-Dissociation, last CO3 2-With Ca2+Generate CaCO in the basic conditions3Precipitation, but the method scope of application is narrower。
(5) ferrum oxidizing process: add ferrous sulfate in cadmium wastewater, sodium hydroxide is adopted to regulate pH to 9 ~ 10, heat and pass into compression air and aoxidize, ferrite crystal can be formed and make the metal ions such as cadmium enter in ferrite lattice, filtering and just may separate out containing Cd ferrite。The method uses face narrower, also has the problem that many technical combinations are brought。
(6) electrolysis: electrolysis refers to the ultimate principle of application electrolysis, makes heavy metal in waste water isolation electrolysis, occurs oxidation and reduction reaction to make it be enriched with respectively, then process on sun-cloudy the two poles of the earth。The method cadmium clearance is high, but cost is also higher。
2, phytoremediation technology
Phytoremediation technology is to utilize the water plant patience to cadmium pollution water body such as gladiolus, Taiwan quillwort, point leaf Phaleria macrocarpa, water body is repaired, can remove the cadmium in water body to some extent, but selectable tolerant plant kind and quantity are few。
3, biological reinforcing technology
Namely traditional bioremediation technology utilizes the metabolism of biology to process waste water。Adding the microorganism with specific function or some substrate in traditional biological treatment system, strengthen its degradation capability to specific pollutants, thus improving the treatment effect of whole sewage disposal system, this technology is referred to as biological reinforcing technology。The shortcoming of the method is that fixation support cost is high, service life is short。
At present, existing have that reaction is slow containing cadmium electroplating effluent treatment method, narrow application range, control condition is many, cost is high and easily causes the deficiencies such as secondary pollution。Therefore, it is necessary to break away from existing treatment technology thinking, hew out and process the new way having cadmium in electroplating wastewater, and then develop the electroplating wastewater Cadmium treated technology of a kind of new type。
Summary of the invention
For solving the deficiencies in the prior art, the invention provides and a kind of remove the processing method of cadmium in electroplating wastewater, electroplating wastewater containing cadmium enters sump by waste line, carry out centralized collection at this and preliminarily stabilised regulates, the outlet of sump connects coarse rack by waste line, the major diameter solid matter in waste water is removed at this, the outlet of coarse rack connects primary sedimentation basin by waste line, the insoluble matter in waste water is removed further at this, the outlet of primary sedimentation basin connects pH value regulating reservoir by waste line, waste water carries out the accurate adjustment of pH value at this, the pH value range of pH value regulating reservoir water outlet is 5.5 ~ 6.5, water pH value requirement is entered with what meet tea seed cake-aeration flotation decontamination systems, the outlet of pH value regulating reservoir connects tea seed cake-aeration flotation decontamination systems by waste line, foam row's mouth of tea seed cake-aeration flotation decontamination systems connects heating concentration basin by waste line, foam is made to be concentrated at this by low-temperature heat (50 ~ 60 DEG C), the outlet of heating concentration basin connects alkalization sedimentation tank by waste line, waste water carries out basification at this, so as to complete the precipitation process of cadmium in the basic conditions, formed containing cadmium mud and recycle, simultaneously, the outlet of alkalization sedimentation tank and tea seed cake-aeration flotation decontamination systems connects pH value Secondary Control pond respectively through waste line, at this, pH value of the waste water after tea seed cake-aeration flotation decontamination systems processes and the waste water after alkalization sedimentation tank processes is adjusted to close to neutral, the outlet in pH value Secondary Control pond is by waste line connecting secondary sedimentation tank, at this, other insoluble matters in waste water are all removed, the outlet of secondary sedimentation tank connects water purifying tank by waste line, the outlet of water purifying tank will be arranged outside the purification water outlet after native system processes by waste line；Wherein, tea seed cake-aeration flotation decontamination systems adopts high-silicon austenite stainless steel material, internal layer brushing corrosion-resistant finishes, 10 micro porous aeration heads are installed bottom cell body, every micro porous aeration head is connected to air compressor by gas piping, 4 groups of totally 8 worry hopper bases it are longitudinally provided with in the middle part of cell body, often two worry hopper bases of group are symmetrical, often group worry hopper base is respectively and fixedly provided with a tea seed cake filter hopper, cell body left side central portion is provided with inlet valve, the above position of the cell body right hand top water surface is provided with foam row's mouth, below the cell body right hand top water surface, position is provided with flowing water Valve；After pH value adjustment processes, the electroplating wastewater of (after process, pH value is 5.5 ~ 6.5) enters inside cleaning system by the inlet valve of tea seed cake-aeration flotation decontamination systems left side central portion, the tea seed cake being arranged in the middle part of cell body 4 tea seed cake filter hopper is fully contacted with waste water, the tea saponin contained in tea seed cake cadmium ion in waste water is combined and is formed and is prone to pneumatically supported molecular structure, simultaneously, it is positioned at bottom cell body 10 micro porous aeration heads to start working, produce the ultra-fine bubble of 80 ~ 120 μm, and inside cell body, do floating motion, when ultra-fine bubble is by tea seed cake filter hopper, can carry secretly and float up to the water surface together in conjunction with the tea saponin of cadmium ion, and converge formation buoyant foam gradually, buoyant foam escapes and enter heating concentration basin by being positioned at foam row's mouth of more than the water surface, foam waste water after low-temperature heat (50 ~ 60 DEG C) concentrates enters alkalization sedimentation tank, complete the precipitation process of cadmium in the basic conditions, formed containing cadmium mud, thus cadmium ion is removed from waste water, and recycled；Wherein, the effect of pH value regulating reservoir is to regulate the pH value of waste water through primary sedimentation to 5.5 ~ 6.5, enters water pH value requirement with what meet tea seed cake-aeration flotation decontamination systems；Wherein, the effect heating concentration basin is to make foam be concentrated by low-temperature heat (50 ~ 60 DEG C)；Wherein, the effect of alkalization sedimentation tank is to be alkalized by waste water, so as to the precipitation process completing cadmium in the basic conditions is formed containing cadmium mud；Wherein, the effect in pH value Secondary Control pond is to be adjusted to the pH value of the waste water after tea seed cake-aeration flotation decontamination systems processes and the waste water after alkalization sedimentation tank processes close to neutral。
Wherein, the dischargeable capacity of tea seed cake-aeration flotation decontamination systems cell body is 260m3, the volume of tea seed cake filter hopper is 10.5m3, aperture is 25 orders, and the tea saponin content in tea seed cake is 18.5% ~ 21.0%。
Wherein, the running voltage of the air compressor of tea seed cake-aeration flotation decontamination systems is 380V, and micro porous aeration head can produce the bubble that diameter is 80 ~ 120 μm, and the loss of its aeration resistance is 8500Pa。
It is an advantage of the current invention that:
(1) this method has been broken away from existing containing cadmium purifying electroplating wastewater handling principle, the creationary cadmium ion flotation characteristic that make use of the tea saponin contained in tea seed cake to have, under mild acid conditions, tea saponin very easily occurs with cadmium to combine and formed to be prone to pneumatically supported molecular structure, is conducive to the carrying out that follow-up aeration flotation processes。
(2) a set of aeration floatation system of this method innovative design, longitudinally disposed 4 filter hopper being assembled with tea seed cake granule, as its surface haptoreaction medium, the tea saponin contained in cadmium ion in waste water and tea seed cake granule is enable to be fully contacted, improve absorption complex reaction efficiency, improving the disposal ability of whole system, the electroplating wastewater after being processed by this method, its cadmium ion removal efficiency is up to 97.2%。
(3) this method have employed Semen Camelliae residue tea seed cake after oil expression as reaction mass, does not use any toxic chemical substance, thus eliminating the risk introducing the pollutant new, harm is bigger；Meanwhile, tea seed cake is with low cost, it is easy to obtains, can be substantially reduced the Material Cost of wastewater treatment。
(4) this method principle is simple, designes and constructes less costly, and treatment effect is better, and operation expense is very low, is conducive in the vast Semen Camelliae growing area popularization and application of China。
Accompanying drawing explanation
Fig. 1 is the equipment schematic diagram of the present invention。
In figure: 1-sump, 2-coarse rack, 3-primary sedimentation basin, 4-pH value regulating reservoir, 5-tea seed cake-aeration flotation decontamination systems, 6-heat concentration basin, 7-alkalizes sedimentation tank, 8-pH value Secondary Control pond, 9-secondary sedimentation tank, 10-water purifying tank
Fig. 2 is the schematic diagram of tea seed cake-aeration flotation decontamination systems。
51-inlet valve, 52-micro porous aeration head, 53-gas piping, 54-air compressor, 55-filter hopper support, 56-tea seed cake filter hopper, 57-flowing water Valve, 58-foam row's mouth。
Detailed description of the invention
The processing method of cadmium in removal electroplating wastewater as shown in Figure 1, electroplating wastewater containing cadmium enters sump 1 by waste line, carry out centralized collection at this and preliminarily stabilised regulates, the outlet of sump 1 connects coarse rack 2 by waste line, the major diameter solid matter in waste water is removed at this, the outlet of coarse rack 2 connects primary sedimentation basin 3 by waste line, the insoluble matter in waste water is removed further at this, the outlet of primary sedimentation basin 3 connects pH value regulating reservoir 4 by waste line, waste water carries out the accurate adjustment of pH value at this, the pH value range of pH value regulating reservoir 4 water outlet is 5.5 ~ 6.5, water pH value requirement is entered with what meet tea seed cake-aeration flotation decontamination systems 5, the outlet of pH value regulating reservoir 4 connects tea seed cake-aeration flotation decontamination systems 5 by waste line, foam row's mouth of tea seed cake-aeration flotation decontamination systems 5 connects heating concentration basin 6 by waste line, foam is made to be concentrated at this by low-temperature heat (50 ~ 60 DEG C), the outlet of heating concentration basin 6 connects alkalization sedimentation tank 7 by waste line, waste water carries out basification at this, so as to complete the precipitation process of cadmium in the basic conditions, formed containing cadmium mud and recycle, simultaneously, the outlet of alkalization sedimentation tank 7 and tea seed cake-aeration flotation decontamination systems 5 connects pH value Secondary Control pond 8 respectively through waste line, at this, pH value of the waste water after tea seed cake-aeration flotation decontamination systems 5 processes and the waste water after alkalization sedimentation tank 7 processes is adjusted to close to neutral, the outlet in pH value Secondary Control pond 8 is by waste line connecting secondary sedimentation tank 9, at this, other insoluble matters in waste water are all removed, the outlet of secondary sedimentation tank 9 connects water purifying tank 10 by waste line, the outlet of water purifying tank 10 will be arranged outside the purification water outlet after native system processes by waste line；Wherein, tea seed cake-aeration flotation decontamination systems 5 adopts high-silicon austenite stainless steel material, internal layer brushing corrosion-resistant finishes, and the dischargeable capacity of cell body is 260m310 micro porous aeration heads 52 are installed bottom cell body, every micro porous aeration head 52 is connected to air compressor 54 by gas piping 53,4 groups of totally 8 worry hopper bases 55 it are longitudinally provided with in the middle part of cell body, often two worry hopper bases 55 of group are symmetrical, often being respectively and fixedly provided with a tea seed cake filter hopper 56 on group worry hopper base 55, the volume of tea seed cake filter hopper 56 is 10.5m3, aperture is 25 orders, and cell body left side central portion is provided with inlet valve 51, and the above position of the cell body right hand top water surface is provided with foam row's mouth 58, and below the cell body right hand top water surface, position is provided with flowing water Valve 57；After pH value adjustment processes, the electroplating wastewater of (after process, pH value is 5.5 ~ 6.5) enters inside cleaning system by the inlet valve 51 of tea seed cake-aeration flotation decontamination systems 5 left side central portion, the tea seed cake being arranged in the middle part of cell body 4 tea seed cake filter hopper 56 is fully contacted with waste water, the tea saponin contained in tea seed cake cadmium ion in waste water is combined and is formed and is prone to pneumatically supported molecular structure, tea saponin mass content in tea seed cake is 18.5% ~ 21.0%, simultaneously, it is positioned at bottom cell body 10 micro porous aeration heads 52 to start working, produce the ultra-fine bubble of 80 ~ 120 μm, and inside cell body, do floating motion, when ultra-fine bubble is by tea seed cake filter hopper 56, can carry secretly and float up to the water surface together in conjunction with the tea saponin of cadmium ion, and converge formation buoyant foam gradually, buoyant foam escapes and enter heating concentration basin 6 by being positioned at foam row's mouth 58 of more than the water surface, foam waste water after low-temperature heat (50 ~ 60 DEG C) concentrates enters alkalization sedimentation tank 7, complete the precipitation process of cadmium in the basic conditions, formed containing cadmium mud, thus cadmium ion is removed from waste water, and recycled；Wherein, the effect of pH value regulating reservoir 4 is to regulate the pH value of waste water through primary sedimentation to 5.5 ~ 6.5, enters water pH value requirement with what meet tea seed cake-aeration flotation decontamination systems 5；Wherein, the effect heating concentration basin 6 is to make foam be concentrated by low-temperature heat (50 ~ 60 DEG C)；Wherein, the effect of alkalization sedimentation tank 7 is to be alkalized by waste water, so as to the precipitation process completing cadmium in the basic conditions is formed containing cadmium mud；Wherein, the effect in pH value Secondary Control pond 8 is to be adjusted to the pH value of the waste water after tea seed cake-aeration flotation decontamination systems 5 processes and the waste water after alkalization sedimentation tank 7 processes close to neutral。
Electroplating wastewater after being processed by this method, its cadmium ion removal efficiency is up to 97.2%。
Claims (4)
1. remove the processing method of cadmium in electroplating wastewater for one kind, it is characterized in that, electroplating wastewater containing cadmium enters sump by waste line, the outlet of sump connects coarse rack by waste line, the outlet of coarse rack connects primary sedimentation basin by waste line, the outlet of primary sedimentation basin connects pH value regulating reservoir by waste line, the outlet of pH value regulating reservoir connects tea seed cake-aeration flotation decontamination systems by waste line, foam row's mouth of tea seed cake-aeration flotation decontamination systems connects heating concentration basin by waste line, the outlet of heating concentration basin connects alkalization sedimentation tank by waste line, alkalization sedimentation tank discharge containing cadmium mud recycling, simultaneously, the outlet of alkalization sedimentation tank and tea seed cake-aeration flotation decontamination systems connects pH value Secondary Control pond respectively through waste line, the outlet in pH value Secondary Control pond is by waste line connecting secondary sedimentation tank, the outlet of secondary sedimentation tank connects water purifying tank by waste line, the outlet of water purifying tank will be arranged outside purification water outlet after treatment by waste line；Wherein, 10 micro porous aeration heads are installed bottom the cell body of tea seed cake-aeration flotation decontamination systems, every micro porous aeration head is connected to air compressor by gas piping, 4 groups of totally 8 worry hopper bases it are longitudinally provided with in the middle part of cell body, often two worry hopper bases of group are symmetrical, often group worry hopper base is respectively and fixedly provided with a tea seed cake filter hopper, cell body left side central portion is provided with inlet valve, the above position of the cell body right hand top water surface is provided with foam row's mouth, and below the cell body right hand top water surface, position is provided with flowing water Valve；Electroplating wastewater after pH value adjustment processes enters inside cleaning system by the inlet valve of tea seed cake-aeration flotation decontamination systems left side central portion, the tea seed cake being arranged in the middle part of cell body 4 tea seed cake filter hopper is fully contacted with waste water, the tea saponin contained in tea seed cake cadmium ion in waste water is combined and is formed and is prone to pneumatically supported molecular structure, simultaneously, be positioned at bottom cell body 10 micro porous aeration heads start working generation ultra-fine bubble, and inside cell body, do floating motion, when ultra-fine bubble is by tea seed cake filter hopper, can carry secretly and float up to the water surface together in conjunction with the tea saponin of cadmium ion, and converge formation buoyant foam gradually, buoyant foam escapes and enter heating concentration basin by being positioned at foam row's mouth of more than the water surface, foam waste water after low-temperature heat concentrates enters alkalization sedimentation tank, complete the precipitation process of cadmium in the basic conditions, formed containing cadmium mud, thus cadmium ion is removed from waste water, and recycled。
2. the processing method of cadmium in removal electroplating wastewater according to claim 1, it is characterised in that the dischargeable capacity of tea seed cake-aeration flotation decontamination systems cell body is 260m3, the volume of tea seed cake filter hopper is 10.5m3, aperture is 25 orders, and the tea saponin content in tea seed cake is about 18.5% ~ 21.0%。
3. the processing method of cadmium in removal electroplating wastewater according to claim 1, it is characterized in that, the running voltage of the air compressor in tea seed cake-aeration flotation decontamination systems is 380V, and micro porous aeration head can produce the bubble that diameter is 80 ~ 120 μm, and the loss of its aeration resistance is 8500Pa。
4. the processing method of cadmium in removal electroplating wastewater according to claim 1, it is characterised in that the pH value of the electroplating wastewater after pH value adjustment processes is about 5.5 ~ 6.5。
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| CN106583432A (en) * | 2017-01-05 | 2017-04-26 | 长沙汇聚环境技术有限公司 | Repairing method for cadmium polluted farmland soil |
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