CN111547956A - Biochemical method for breaking chromium-containing organic wastewater - Google Patents
Biochemical method for breaking chromium-containing organic wastewater Download PDFInfo
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- CN111547956A CN111547956A CN202010450633.8A CN202010450633A CN111547956A CN 111547956 A CN111547956 A CN 111547956A CN 202010450633 A CN202010450633 A CN 202010450633A CN 111547956 A CN111547956 A CN 111547956A
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- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 title claims abstract description 58
- 229910052804 chromium Inorganic materials 0.000 title claims abstract description 58
- 239000011651 chromium Substances 0.000 title claims abstract description 58
- 239000002351 wastewater Substances 0.000 title claims abstract description 49
- 238000002306 biochemical method Methods 0.000 title description 2
- 238000000034 method Methods 0.000 claims abstract description 33
- 238000006243 chemical reaction Methods 0.000 claims abstract description 20
- 239000010802 sludge Substances 0.000 claims abstract description 18
- 239000007788 liquid Substances 0.000 claims abstract description 17
- 238000000926 separation method Methods 0.000 claims abstract description 12
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 11
- 238000005842 biochemical reaction Methods 0.000 claims abstract description 10
- 239000003463 adsorbent Substances 0.000 claims abstract description 7
- 210000003462 vein Anatomy 0.000 claims abstract description 7
- 239000007787 solid Substances 0.000 claims abstract description 6
- 238000003756 stirring Methods 0.000 claims abstract description 6
- 239000006228 supernatant Substances 0.000 claims abstract description 3
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical group O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 claims description 40
- 150000003242 quaternary ammonium salts Chemical group 0.000 claims description 13
- 239000003607 modifier Substances 0.000 claims description 9
- 238000001179 sorption measurement Methods 0.000 claims description 8
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 6
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 4
- 239000000178 monomer Substances 0.000 claims description 4
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 claims description 4
- 150000004714 phosphonium salts Chemical group 0.000 claims description 3
- 229910001428 transition metal ion Inorganic materials 0.000 claims description 3
- MCTWTZJPVLRJOU-UHFFFAOYSA-O 1-methylimidazole Chemical group CN1C=C[NH+]=C1 MCTWTZJPVLRJOU-UHFFFAOYSA-O 0.000 claims description 2
- 230000000813 microbial effect Effects 0.000 claims description 2
- 229910000027 potassium carbonate Inorganic materials 0.000 claims description 2
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 2
- 239000002910 solid waste Substances 0.000 abstract description 3
- 238000004065 wastewater treatment Methods 0.000 abstract description 2
- 229910052901 montmorillonite Inorganic materials 0.000 description 32
- -1 montmorillonite quaternary ammonium salt Chemical class 0.000 description 10
- 239000010410 layer Substances 0.000 description 7
- 238000001556 precipitation Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000011229 interlayer Substances 0.000 description 4
- 238000005342 ion exchange Methods 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 229910052723 transition metal Inorganic materials 0.000 description 3
- 150000003624 transition metals Chemical class 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 239000004094 surface-active agent Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- WYTZZXDRDKSJID-UHFFFAOYSA-N (3-aminopropyl)triethoxysilane Chemical compound CCO[Si](OCC)(OCC)CCCN WYTZZXDRDKSJID-UHFFFAOYSA-N 0.000 description 1
- MYMSJFSOOQERIO-UHFFFAOYSA-N 1-bromodecane Chemical compound CCCCCCCCCCBr MYMSJFSOOQERIO-UHFFFAOYSA-N 0.000 description 1
- GIWQSPITLQVMSG-UHFFFAOYSA-O 2,3-dimethylimidazolium ion Chemical class CC1=[NH+]C=CN1C GIWQSPITLQVMSG-UHFFFAOYSA-O 0.000 description 1
- BKFRZOZNMWIFLH-UHFFFAOYSA-O 3-decyl-2-methyl-1h-imidazol-3-ium Chemical class CCCCCCCCCCN1C=C[NH+]=C1C BKFRZOZNMWIFLH-UHFFFAOYSA-O 0.000 description 1
- 239000005995 Aluminium silicate Substances 0.000 description 1
- FVNBLVJWHLOLDU-UHFFFAOYSA-N CCCCCCCCCCCCCCC(CCC)P(CCCC)CCCC.Cl Chemical compound CCCCCCCCCCCCCCC(CCC)P(CCCC)CCCC.Cl FVNBLVJWHLOLDU-UHFFFAOYSA-N 0.000 description 1
- LZZYPRNAOMGNLH-UHFFFAOYSA-M Cetrimonium bromide Chemical compound [Br-].CCCCCCCCCCCCCCCC[N+](C)(C)C LZZYPRNAOMGNLH-UHFFFAOYSA-M 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 241000501667 Etroplus Species 0.000 description 1
- RAXXELZNTBOGNW-UHFFFAOYSA-O Imidazolium Chemical compound C1=C[NH+]=CN1 RAXXELZNTBOGNW-UHFFFAOYSA-O 0.000 description 1
- 229910001374 Invar Inorganic materials 0.000 description 1
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 description 1
- QRDQDVDCSYYLLB-UHFFFAOYSA-N OC=CCCCCCCCCCBr Chemical compound OC=CCCCCCCCCCBr QRDQDVDCSYYLLB-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 235000012211 aluminium silicate Nutrition 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000005341 cation exchange Methods 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 238000009388 chemical precipitation Methods 0.000 description 1
- 150000001844 chromium Chemical class 0.000 description 1
- 229910001430 chromium ion Inorganic materials 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical class O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- 238000004043 dyeing Methods 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 210000000750 endocrine system Anatomy 0.000 description 1
- 125000004185 ester group Chemical group 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000008394 flocculating agent Substances 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 229910001410 inorganic ion Inorganic materials 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 210000003734 kidney Anatomy 0.000 description 1
- 239000010985 leather Substances 0.000 description 1
- 210000004185 liver Anatomy 0.000 description 1
- 210000004072 lung Anatomy 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 239000000693 micelle Substances 0.000 description 1
- 238000012703 microemulsion polymerization Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 125000000962 organic group Chemical group 0.000 description 1
- 229920001195 polyisoprene Polymers 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 210000001533 respiratory mucosa Anatomy 0.000 description 1
- 210000002345 respiratory system Anatomy 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 125000001424 substituent group Chemical group 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
- 238000002411 thermogravimetry Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- SZEMGTQCPRNXEG-UHFFFAOYSA-M trimethyl(octadecyl)azanium;bromide Chemical compound [Br-].CCCCCCCCCCCCCCCCCC[N+](C)(C)C SZEMGTQCPRNXEG-UHFFFAOYSA-M 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
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
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
-
- 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
- C02F2101/30—Organic compounds
-
- 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
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
Abstract
The invention discloses a biochemical vein breaking method for chromium-containing organic wastewater, relates to the technical field of wastewater treatment, and aims to solve the technical problems of high cost and multiple solid wastes of the treatment method for chromium-containing wastewater in the prior art, wherein the technical scheme of the invention is as follows: the method comprises the following steps: adding an alkaline agent for adjusting pH into chromium-containing organic wastewater to adjust the pH value to 7-8; step two, adding activated sludge into the wastewater in the step one at the temperature of 20-40 ℃, aerating and stirring the wastewater, carrying out biochemical reaction, and carrying out solid-liquid separation after the reaction is finished to finish complex breaking; and step three, after the step two is finished, taking supernatant liquid, stirring, adding a solid adsorbent, and after the reaction is finished, carrying out solid-liquid separation to finish dechromization.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a biochemical vein breaking method for chromium-containing organic wastewater.
Background
The metal chromium has wide industrial application, and the compound of the metal chromium is widely present in waste water discharged by industries such as chromium salt production, textile dyeing, dye production, leather making, electroplating and the like. It exists primarily as trivalent and hexavalent adducts, which are more biologically toxic than trivalent chromium due to its high solubility. Chromide can invade the human body through respiratory tract and mucosa, and mainly accumulates in liver, kidney, endocrine system and lung.
The chromium-containing wastewater is treated by a plurality of methods, such as a precipitation method, an adsorption method, an ion exchange method and the like, but the chromium in a complex state in the organic wastewater cannot be completely removed by using the precipitation method and the adsorption method alone, and a plurality of chromium-containing sludge is generated. The ion exchange method is to adsorb chromium by porous resin or ion exchange fiber, most of the adsorbed chromium is in an ionic state, the effect on the chromium in a complex state is limited, and in the actual operation process, the problems of regeneration, recovery and the like of the adsorbent are difficult due to strong adsorption capacity, and the treatment cost is high.
In conclusion, the prior art method for treating the chromium-containing wastewater has the defects of high cost and more solid wastes.
Disclosure of Invention
In order to solve the technical problems of high cost and multiple solid wastes of the treatment method of the chromium-containing wastewater in the prior art, the technical scheme of the invention is as follows:
the invention relates to a biochemical complex breaking method for chromium-containing organic wastewater, which comprises the following steps:
adding an alkaline agent for adjusting pH into chromium-containing organic wastewater to adjust the pH value to 7-8;
step two, adding activated sludge into the wastewater in the step one at the temperature of 20-40 ℃, aerating and stirring the wastewater, carrying out biochemical reaction, and carrying out solid-liquid separation after the reaction is finished to finish complex breaking;
and step three, after the step two is finished, taking supernatant liquid, stirring, adding a solid adsorbent, and after the reaction is finished, carrying out solid-liquid separation to finish dechromization.
Furthermore, the chromium in the chromium-containing organic wastewater exists in a complex state, and the total chromium concentration is 0.001-500 mg/L.
Further, in the first step, the alkaline agent used for adjusting the pH is one or more of sodium hydroxide, potassium carbonate and sodium carbonate.
Further, in the second step, the activated sludge is one or more of municipal biochemical sludge, industrial biochemical sludge and microbial agents.
Further, in the second step, the sludge concentration in the biochemical reaction is kept at 4000-6000 mg/L.
Further, in the second step, the biochemical reaction is carried out at the temperature of 20-40 ℃ for 12-48 h.
Further, in the third step, adsorption reaction is carried out for 40min-2h at the temperature of 20-40 ℃.
Further, in the third step, the solid adsorbent is modified montmorillonite. Montmorillonite is naturally stored abundantly, the price is cheap, take the form of lamellar or lamellar structure, the monolayer of each crystal, the thickness is about 1nm, the horizontal width of surface reaches 100nm, these structural features make it demonstrate good cation exchange capacity, strong adsorptivity and surface activity. Since a large amount of inorganic ions are dispersed among montmorillonite layers to make the surfaces hydrophilic and oleophobic, which is not favorable for dispersion in waste water, it is very necessary to organically modify montmorillonite. The modified montmorillonite reduces the surface polarity of the montmorillonite, increases the interlayer spacing of the montmorillonite, improves the thermal stability of the montmorillonite, and realizes the nanoscale dispersion of the montmorillonite in wastewater.
Further, the modifier of the modified montmorillonite is quaternary ammonium salt, quaternary phosphonium salt, methyl-imidazolium salt, transition metal ions or functional monomer.
The montmorillonite quaternary ammonium salt modifier is characterized in that natural montmorillonite generally contains hydrated Na + and K +, quaternary ammonium salt is generally added into montmorillonite dispersion liquid, quaternary ammonium salt cations and cations among montmorillonite are subjected to ion exchange, so that quaternary ammonium salt cations or organic groups are inserted or covered among the montmorillonite layers, and the quaternary ammonium salt enters the montmorillonite layers to enlarge the space between the montmorillonite layers due to the larger volume of the quaternary ammonium salt while changing the microenvironment among the montmorillonite layers, thereby being beneficial to the insertion of macromolecules and further achieving the purpose of modification. The traditional quaternary ammonium salt modifier mainly comprises cetyl trimethyl ammonium bromide and octadecyl trimethyl ammonium bromide. Compared with the common quaternary ammonium salt surfactant, the Gemini quaternary ammonium salt surfactant has the greatest difference that two electrons can be exchanged with ions between montmorillonite layers, the critical micelle concentration is lower, and the efficiency of reducing the oil/water interfacial tension is higher. Compared with the common quaternary ammonium salt, the Gemini quaternary ammonium salt can obviously increase the interlayer spacing of the montmorillonite, the modified montmorillonite forms a peeling state, and the performances of all aspects are obviously better than those of the montmorillonite treated by the common quaternary ammonium salt. The special ester group-containing Gemini quaternary ammonium salt modified montmorillonite is used, the interlayer spacing of the montmorillonite can achieve an ideal effect, the surface area of the montmorillonite can be obviously increased, and the prepared modified montmorillonite is used for adsorbing ionic chromium pollutants, and the adsorption amount of the modified montmorillonite is 133mg/g and is far higher than that of activated carbon, kaolin and modified zeolite.
The montmorillonite quaternary phosphonium salt modifier is prepared by mixing 3-aminopropyl triethoxysilane and tetradecyl tributyl phosphine chloride to modify montmorillonite, and can improve the thermal stability of montmorillonite to 344 deg.C.
The montmorillonite methyl-imidazolium salt modifier has the thermal stability of imidazolium cation higher than that of quaternary ammonium salt or quaternary phosphonium salt cation. 1-decyl-2-methylimidazolium salt, 1, 2-dimethylimidazolium salt, 11-bromoundecaprate, 1-bromodecane and 11-bromo-1-undecenol which have different substituents or functional groups modify the montmorillonite, and the pyrolysis temperature of the modified montmorillonite can reach 376 ℃ at most.
The montmorillonite transition metal ion modifier is the montmorillonite modified by transition metals (such as copper and iron), and thermogravimetric analysis shows that the thermal degradation temperature of the montmorillonite modified by the transition metals reaches 400 ℃, and the transition metals are washed by a better solvent to obviously influence the modification effect. The montmorillonite treated by Fe-Ni invar alloy can form a spherical structure with the diameter of 30-40nm, and the adsorption capacity to pollutants is obviously improved.
The montmorillonite functional monomer modifier intercalates functional monomer polyisoprene into a montmorillonite layer by using a microemulsion polymerization method, increases the interlayer spacing of montmorillonite to 3.8nm and is in a peeling type, and has excellent mechanical, barrier and adsorption properties.
Compared with the prior art, the biochemical vein breaking method for chromium-containing organic wastewater has the beneficial effects that:
in the prior art, chromium ions are generally directly subjected to physical and chemical precipitation, but complex chromium in water is difficult to directly precipitate and more chromium-containing sludge is generated. Compared with the prior art, the invention has the following advantages: the process can completely convert the complex chromium in the chromium-containing organic wastewater into the ionic chromium, has less generation amount of dangerous waste, no additional complex breaking agent and lower cost, adsorbs the ionic chromium by the activated sludge and the solid adsorbent, does not use a flocculating agent in the process, has small generation amount of the chromium-containing sludge, avoids secondary pollution and is easy to popularize.
Drawings
FIG. 1 is a schematic flow chart of a biochemical complex breaking method for chromium-containing organic wastewater in the invention.
Detailed Description
The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
the embodiment provides a biochemical complex breaking method for chromium-containing organic wastewater, which specifically comprises the following steps:
selecting chromium-containing organic wastewater subjected to alkaline agent precipitation treatment in a certain tanning factory, wherein the total chromium content is 15.6mg/L, the pH value is 8, adding the organic wastewater into the factory, carrying out biochemical reaction for 12 hours, the sludge concentration is 5000mg/L, the reaction temperature is 25 ℃, after solid-liquid separation, adding a certain amount of Gemini quaternary ammonium salt modified montmorillonite for reaction, keeping the wastewater in a slowly stirred state, carrying out the reaction for 30min, and carrying out the solid-liquid separation after the reaction is finished, wherein the total chromium content in the obtained clear liquid is 0.33 mg/L.
Example 2
The embodiment provides a biochemical complex breaking method for chromium-containing organic wastewater, which specifically comprises the following steps:
selecting chromium-containing organic wastewater subjected to alkaline agent precipitation treatment in a certain tanning factory, wherein the total chromium content is 10.2mg/L, the pH value is 8, adding the organic wastewater into the factory, carrying out biochemical reaction for 12h, the sludge concentration is 5000mg/L, the reaction temperature is 29 ℃, after solid-liquid separation, adding a certain amount of Fe ion modified montmorillonite for reaction, keeping the wastewater in a slowly stirred state, carrying out reaction for 30min, and carrying out solid-liquid separation after the reaction is finished, wherein the total chromium content in the obtained clear solution is 0.28 mg/L.
Example 3
The embodiment provides a biochemical complex breaking method for chromium-containing organic wastewater, which specifically comprises the following steps:
selecting chromium-containing organic wastewater subjected to alkaline agent precipitation treatment in a certain tanning factory, wherein the total chromium content is 13.8mg/L, the pH value is 7.6, adding the organic wastewater into the factory, carrying out biochemical reaction for 12 hours, the sludge concentration is 5000mg/L, the reaction temperature is 27 ℃, carrying out solid-liquid separation, adding a certain amount of methyl-imidazolium salt modified montmorillonite for reaction, keeping the wastewater in a slowly-stirred state, carrying out the reaction for 30min, and carrying out solid-liquid separation after the reaction is finished, wherein the total chromium content in the obtained clear solution is 0.41 mg/L.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A biochemical complex breaking method for chromium-containing organic wastewater is characterized by comprising the following steps:
adding an alkaline agent for adjusting pH into chromium-containing organic wastewater to adjust the pH value to 7-8;
step two, adding activated sludge into the wastewater in the step one at the temperature of 20-40 ℃, aerating and stirring the wastewater, carrying out biochemical reaction, and carrying out solid-liquid separation after the reaction is finished to finish complex breaking;
and step three, after the step two is finished, taking supernatant liquid, stirring, adding a solid adsorbent, and after the reaction is finished, carrying out solid-liquid separation to finish dechromization.
2. The biochemical complex breaking method for chromium-containing organic wastewater as claimed in claim 1, wherein the chromium in the chromium-containing organic wastewater exists in a complex state, and the total chromium concentration is 0.001-500 mg/L.
3. The biochemical complex breaking method for chromium-containing organic wastewater according to claim 1, wherein in the first step, the alkaline agent for adjusting the pH is one or more of sodium hydroxide, potassium carbonate and sodium carbonate.
4. The biochemical complex breaking method for chromium-containing organic wastewater according to claim 1, wherein in the second step, the activated sludge is one or more of municipal biochemical sludge, industrial biochemical sludge and microbial agents.
5. The biochemical vein breaking method for chromium-containing organic wastewater as claimed in claim 1, wherein in the second step, the sludge concentration in the biochemical reaction is maintained at 4000-6000 mg/L.
6. The biochemical complex breaking method for chromium-containing organic wastewater according to claim 1, wherein in the second step, the biochemical reaction is carried out at 20-40 ℃ for 12-48 h.
7. The biochemical vein breaking method for chromium-containing organic wastewater according to claim 1, wherein in the third step, the adsorption reaction is carried out for 40min-2h at 20-40 ℃.
8. The biochemical vein breaking method for chromium-containing organic wastewater according to claim 1, wherein in the third step, the solid adsorbent is modified montmorillonite.
9. The biochemical complex breaking method for chromium-containing organic wastewater according to claim 8, wherein the modifier of the modified montmorillonite is quaternary ammonium salt, quaternary phosphonium salt, methyl-imidazolium salt, transition metal ion or functional monomer.
10. The biochemical vein breaking method for chromium-containing organic wastewater according to claim 9, wherein the modifier of the modified montmorillonite is Gemini quaternary ammonium salt.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114031228A (en) * | 2021-11-12 | 2022-02-11 | 西安优瑞卡环保科技有限公司 | Method for breaking and stably releasing chromium in organic chromium-containing wastewater |
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| CN109824219A (en) * | 2019-04-01 | 2019-05-31 | 陕西科技大学 | A kind of system for processing chrome-containing wastewater and its method |
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2020
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|---|---|---|---|---|
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