CN111039416A - Novel biological method for removing chromaticity in printing and dyeing wastewater - Google Patents
Novel biological method for removing chromaticity in printing and dyeing wastewater Download PDFInfo
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Abstract
The invention provides a novel method for removing chromaticity in printing and dyeing wastewater by a biological method, which relates to the technical field of sewage treatment, and is characterized in that rare earth load modified basalt fibers and activated sludge are uniformly mixed and then added into a bioreactor; preparing bacillus coagulans into a bacterial suspension, inoculating the bacterial suspension into a bioreactor, adding a culture solution, and finishing biofilm formation and domestication; the method for treating the printing and dyeing wastewater has good effect of removing both chromaticity and COD, has high removal efficiency, and can ensure that both chromaticity and chemical oxygen demand are qualified after 30 hours of treatment, thereby reaching the discharge standard.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a novel method for removing chromaticity in printing and dyeing wastewater by a biological method.
Background
Dyes are organic substances which give other substances vivid colors, and have been used for thousands of years by humans, and more than 100000 dyes are currently used commercially. According to statistics, the dye yield of China reaches 91.72 ten thousand tons in 2014, and the dye is at the top of the world. Dyes according to chemical structure can be classified into azo dyes, anthraquinone dyes, indigo dyes, sulfur dyes, cyanine dyes, triarylmethane dyes, etc., wherein the most used generic azo dyes account for 65% -70% of all dyes. A large amount of printing and dyeing wastewater is inevitably generated in the production and use processes of the dye, 160 million tons of dye is estimated to be produced in the world every year, the dye accounts for 10% -15% of the total volume and is discharged as wastewater, the wastewater has the characteristics of high chromaticity, high organic matter content, complex components, difficult biodegradation and the like, and some wastewater also has carcinogenic, teratogenic and mutagenic effects and belongs to one of the wastewater in the intractable industry.
The printing and dyeing wastewater comprises desizing wastewater which contains various sizing agents and decomposition products thereof, fiber scraps, acid and alkali, enzyme pollutants and the like, the BOD and COD in the wastewater using the starch sizing agent are high, while the COD in the wastewater synthesizing the sizing agent is higher, and the BOD is less than 5 mg/L; the boiling wastewater has strong alkalinity of the wastewater of the cotton fiber, high COD and BOD values (up to thousands of milligrams per liter), large water volume, high pollution degree and brown color, and the pollution degree of the wastewater of the chemical fiber is light; bleaching waste water, the water yield is large, and the pollution is light; mercerizing wastewater. The fabric is alkaline, has a pH value of 12-13, contains a plurality of fiber scraps and other suspended matters, and has high BOD and COD values; the dyeing wastewater has different pollution degrees with different fiber types, dye types and concentrations, auxiliary agents and scales, mainly contains organic dye, surfactant and the like, has high basic COD and BOD and less suspended matters; the printing wastewater mainly contains organic dye, surfactant and other pollutants, and has high COD and BOD values; the finishing process wastewater mainly contains fiber scraps, resin, formaldehyde, oil solution and slurry, and has small water amount. The wastewater pollution concentration of the wool weaving and dyeing plant is high, the wastewater is about 318t when 454kg of cleaned wool is produced, the water quality is brown and colloidal, and the organic pollutants calculated by BOD are 91-114 kg.
The common methods for treating the wastewater mainly comprise a coagulating sedimentation method, an adsorption method, membrane separation, an advanced oxidation technology, a biochemical method and the like, but due to the characteristics of high organic matter content and high chromaticity of the dye wastewater, the technologies cannot achieve ideal treatment effects, and particularly the removal of chromaticity in the printing and dyeing wastewater is always difficult.
Disclosure of Invention
The purpose of the invention is as follows: aiming at the technical problems, the invention provides a novel method for removing chromaticity in printing and dyeing wastewater by a biological method.
In order to achieve the purpose of the invention, the technical scheme adopted by the invention is as follows:
a novel biological method for removing chromaticity in printing and dyeing wastewater comprises the following specific steps:
(1) adding basalt fiber into mixed acid, heating to 50-60 ℃, stirring for 20-30min, taking out, washing with water to neutrality, drying, adding into deionized water, adding hexadecyl trimethyl ammonium chloride and KH-550, heating to 30-35 ℃, stirring for 1-3h, taking out, washing with water, and drying to obtain modified basalt fiber;
(2) preparing a rare earth solution, adding the modified basalt fiber into the rare earth solution, stirring at the speed of 200-;
(3) uniformly mixing the rare earth loaded modified basalt fiber and activated sludge, and adding the mixture into a bioreactor;
(4) inoculating bacillus coagulans into a liquid culture medium to prepare a bacterial suspension, performing shake culture at 37 ℃ for 3-5 days, inoculating into a bioreactor, adding a culture solution, aerating for 10-15 days, completing biofilm culturing, and replacing fresh culture solution every day;
(5) continuously aerating, mixing the culture solution and the printing and dyeing wastewater according to the volume ratio of 3-5:1 to replace the culture solution in the bioreactor, culturing for 3-6 days, mixing the culture solution and the printing and dyeing wastewater according to the volume ratio of 1:1, adding the mixture into the bioreactor, culturing for 10-15 days, mixing the culture solution and the printing and dyeing wastewater according to the volume ratio of 1:3-5, adding the mixture into the bioreactor, culturing for 3-6 days, mixing the culture solution and the printing and dyeing wastewater according to the volume ratio of 1:8-10, adding the mixture into the bioreactor, culturing for 3-6 days, and completing acclimation;
(6) and (3) placing the bioreactor in a printing and dyeing wastewater pool, treating the printing and dyeing wastewater, measuring the chromaticity every day, and discharging after the wastewater is qualified.
Further, the mixed acid is formed by mixing concentrated sulfuric acid and concentrated nitric acid according to the volume ratio of 1: 1-2.
Further, the mass of the hexadecyl trimethyl ammonium chloride and the KH-550 is 0.5-1.5 percent and 4-8 percent of the mass of the deionized water.
Further, the preparation method of the rare earth solution comprises the following steps:
mixing cerium nitrate, yttrium nitrate and erbium nitrate according to the mass ratio of 1:1:1, adding into concentrated hydrochloric acid, heating, stirring and dissolving, heating to 80-90 ℃ to drive acid, supplementing water at proper time during the period to keep the total volume unchanged, and cooling to room temperature when the pH value of the solution is 6-7.
Further, the solid-liquid mass ratio of the modified basalt fiber to the rare earth solution is 1: 50-80.
Further, the mixing mass ratio of the rare earth loaded modified basalt fiber to the activated sludge is 1: 3-10.
Further, the liquid culture medium is a beef extract peptone liquid culture medium or an LB liquid culture medium.
Further, the formulation of each 1L of the culture solution is as follows:
30-50g of glucose, 2-4g of sodium tartrate, 41-2 g of K2HPO, 0.5-0.8g of MgSO4.7H2O, 0.5-1g of KCl, 0.1-0.3g of FeSO4.7H2O and the balance of water.
Further, the formulation of each 1L of the culture solution is as follows:
35g of glucose, 3g of sodium tartrate, K2HPO 41.2 g, 0.6g of MgSO4.7H 2O, 0.5g of KCl, 0.1g of FeSO4.7H 2O and the balance of water.
The invention has the beneficial effects that:
the inventors guess that the rare earth element can effectively activate the biological enzyme in the bacillus coagulans to promote the synthesis of protein and further promote the growth of bacteria, or the rare earth element can improve the contents of amino acid, nucleic acid and protein in the bacillus coagulans to accelerate metabolism, so that the growth speed is greatly increased, the domestication survival rate is also greatly improved, the domestication period is shortened, the activated sludge contains complex microorganisms, and forms a complex food chain with organic nutrients in printing and dyeing wastewater, wherein the anaerobic bacteria and the saprophytic fungi can be cooperated with the bacillus coagulans to improve the purification effect of the printing and dyeing wastewater, actual experiments show that the method for treating the printing and dyeing wastewater has good effect of removing both chromaticity and COD, and has high removal efficiency, and the chromaticity and the chemical oxygen demand are qualified after 30 hours of treatment, thereby reaching the discharge standard.
Detailed Description
The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
Example 1:
a novel biological method for removing chromaticity in printing and dyeing wastewater comprises the following specific steps:
(1) adding basalt fiber into mixed acid formed by mixing concentrated sulfuric acid and concentrated nitric acid according to the volume ratio of 1:1, heating to 55 ℃, stirring for 30min, fishing out, washing to be neutral, drying, adding into deionized water, adding hexadecyl trimethyl ammonium chloride and KH-550 with the mass of 1% and 5% of the deionized water, heating to 35 ℃, stirring for 1h, fishing out, washing with water, and drying to obtain modified basalt fiber;
(2) mixing cerium nitrate, yttrium nitrate and erbium nitrate according to a mass ratio of 1:1:1, adding into concentrated hydrochloric acid, heating, stirring and dissolving, heating to 85 ℃ to drive acid, supplementing water in due time to keep the total volume unchanged, cooling to room temperature when the pH of the solution is 6-7 to obtain a rare earth solution, adding modified basalt fiber into the rare earth solution, stirring at a speed of 400r/min for 5 hours, standing for 25 hours, taking out, transferring into a 110 ℃ drying oven, drying for 12 hours, taking out, calcining in a muffle furnace at an air atmosphere of 500 ℃ for 5 hours to obtain the rare earth-loaded modified basalt fiber;
(3) uniformly mixing the rare earth loaded modified basalt fiber and the activated sludge according to the mass ratio of 1:5, and adding the mixture into a bioreactor;
(4) inoculating bacillus coagulans into a beef extract peptone liquid culture medium to prepare a bacterial suspension, carrying out shake culture at 37 ℃ for 5 days, inoculating into a bioreactor, adding a culture solution, aerating for 12 days, completing biofilm culturing, and replacing fresh culture solution every day, wherein the formula of each 1L of the culture solution is as follows:
35g of glucose, 3g of sodium tartrate, 0.6g of K2HPO41.2g of MgSO4.7H2O, 0.5g of KCl, 0.1g of FeSO4.7H2O0.1 g and the balance of water;
(5) continuously aerating, mixing the culture solution and the printing and dyeing wastewater according to the volume ratio of 3:1 to replace the culture solution in the bioreactor, culturing for 5d, mixing the culture solution and the printing and dyeing wastewater according to the volume ratio of 1:1, adding the mixture into the bioreactor, culturing for 15d, mixing the culture solution and the printing and dyeing wastewater according to the volume ratio of 1:3, adding the mixture into the bioreactor, culturing for 5d, mixing the culture solution and the printing and dyeing wastewater according to the volume ratio of 1:10, adding the mixture into the bioreactor, culturing for 5d, and completing acclimation;
(6) and (3) placing the bioreactor in a printing and dyeing wastewater pool, treating the printing and dyeing wastewater, measuring the chromaticity every day, and discharging after the wastewater is qualified.
Example 2:
a novel biological method for removing chromaticity in printing and dyeing wastewater comprises the following specific steps:
(1) adding basalt fiber into mixed acid formed by mixing concentrated sulfuric acid and concentrated nitric acid according to the volume ratio of 1:2, heating to 60 ℃, stirring for 30min, fishing out, washing to be neutral, drying, adding into deionized water, adding hexadecyl trimethyl ammonium chloride and KH-550 with the mass of 1.2% and 4% of the deionized water, heating to 30 ℃, stirring for 1h, fishing out, washing and drying to obtain modified basalt fiber;
(2) mixing cerium nitrate, yttrium nitrate and erbium nitrate according to a mass ratio of 1:1:1, adding into concentrated hydrochloric acid, heating, stirring and dissolving, heating to 80 ℃ to drive acid, supplementing water in due course to keep the total volume unchanged, cooling to room temperature when the pH of the solution is 6-7 to obtain a rare earth solution, adding modified basalt fiber into the rare earth solution, wherein the solid-liquid mass ratio of the modified basalt fiber to the rare earth solution is 1:60, stirring at a speed of 200r/min for 5 hours, standing for 20 hours, taking out, transferring into a 110 ℃ drying oven for drying for 12 hours, taking out, calcining in a muffle furnace at an air atmosphere of 480 ℃ for 6 hours, and preparing the rare earth-loaded modified basalt fiber;
(3) uniformly mixing the rare earth loaded modified basalt fiber and the activated sludge according to the mass ratio of 1:8, and adding the mixture into a bioreactor;
(4) inoculating bacillus coagulans into a beef extract peptone liquid culture medium to prepare a bacterial suspension, carrying out shake culture at 37 ℃ for 3-5 days, inoculating into a bioreactor, adding a culture solution, aerating for 10-15 days, completing biofilm culturing, and replacing fresh culture solution every day, wherein the formula of each 1L of the culture solution is as follows:
30g of glucose, 4g of sodium tartrate, K2HPO 42 g, 0.5g of MgSO4.7H2O, 0.5g of KCl, 0.2g of FeSO4.7H2O and the balance of water;
(5) continuously aerating, mixing the culture solution and the printing and dyeing wastewater according to the volume ratio of 3:1 to replace the culture solution in the bioreactor, culturing for 3d, mixing the culture solution and the printing and dyeing wastewater according to the volume ratio of 1:1, adding the mixture into the bioreactor, culturing for 10d, mixing the culture solution and the printing and dyeing wastewater according to the volume ratio of 1:3, adding the mixture into the bioreactor, culturing for 3d, mixing the culture solution and the printing and dyeing wastewater according to the volume ratio of 1:8, adding the mixture into the bioreactor, culturing for 5d, and completing acclimation;
(6) and (3) placing the bioreactor in a printing and dyeing wastewater pool, treating the printing and dyeing wastewater, measuring the chromaticity every day, and discharging after the wastewater is qualified.
Example 3:
a novel biological method for removing chromaticity in printing and dyeing wastewater comprises the following specific steps:
(1) adding basalt fiber into mixed acid formed by mixing concentrated sulfuric acid and concentrated nitric acid according to the volume ratio of 1:1.5, heating to 60 ℃, stirring for 30min, fishing out, washing to be neutral, drying, adding into deionized water, adding hexadecyl trimethyl ammonium chloride and KH-550 which are 0.5% and 6% of the mass of the deionized water, heating to 35 ℃, stirring for 1h, fishing out, washing with water, and drying to obtain modified basalt fiber;
(2) mixing cerium nitrate, yttrium nitrate and erbium nitrate according to a mass ratio of 1:1:1, adding into concentrated hydrochloric acid, heating, stirring and dissolving, heating to 90 ℃ to drive acid, supplementing water in due time to keep the total volume unchanged, cooling to room temperature when the pH of the solution is 6-7 to obtain a rare earth solution, adding modified basalt fiber into the rare earth solution, stirring at a speed of 400r/min for 5 hours, standing for 20 hours, taking out, transferring into a 105 ℃ drying oven, drying for 12 hours, taking out, calcining in a muffle furnace at an air atmosphere of 500 ℃ for 5 hours to obtain the rare earth-loaded modified basalt fiber;
(3) uniformly mixing the rare earth loaded modified basalt fiber and the activated sludge according to the mass ratio of 1:5, and adding the mixture into a bioreactor;
(4) inoculating bacillus coagulans into a beef extract peptone liquid culture medium to prepare a bacterial suspension, carrying out shake culture at 37 ℃ for 5 days, inoculating into a bioreactor, adding a culture solution, aerating for 10 days, completing biofilm culturing, and replacing fresh culture solution every day, wherein the formula of each 1L of the culture solution is as follows:
35g of glucose, 2g of sodium tartrate, K2HPO 42 g, 0.6g of MgSO4.7H2O, 0.5g of KCl, 0.3g of FeSO4.7H2O and the balance of water;
(5) continuously aerating, mixing the culture solution and the printing and dyeing wastewater according to the volume ratio of 3:1 to replace the culture solution in the bioreactor, culturing for 6d, mixing the culture solution and the printing and dyeing wastewater according to the volume ratio of 1:1, adding the mixture into the bioreactor, culturing for 12d, mixing the culture solution and the printing and dyeing wastewater according to the volume ratio of 1:3, adding the mixture into the bioreactor, culturing for 6d, mixing the culture solution and the printing and dyeing wastewater according to the volume ratio of 1:8, adding the mixture into the bioreactor, culturing for 6d, and completing acclimation;
(6) and (3) placing the bioreactor in a printing and dyeing wastewater pool, treating the printing and dyeing wastewater, measuring the chromaticity every day, and discharging after the wastewater is qualified.
Example 4:
a novel biological method for removing chromaticity in printing and dyeing wastewater comprises the following specific steps:
(1) adding basalt fiber into mixed acid formed by mixing concentrated sulfuric acid and concentrated nitric acid according to the volume ratio of 1:1, heating to 60 ℃, stirring for 25min, fishing out, washing to be neutral, drying, adding into deionized water, adding hexadecyl trimethyl ammonium chloride and KH-550 with the mass of 1% and 5% of the deionized water, heating to 35 ℃, stirring for 3h, fishing out, washing with water, and drying to obtain modified basalt fiber;
(2) mixing cerium nitrate, yttrium nitrate and erbium nitrate according to a mass ratio of 1:1:1, adding into concentrated hydrochloric acid, heating, stirring and dissolving, heating to 80 ℃ to drive acid, supplementing water in due course to keep the total volume unchanged, cooling to room temperature when the pH of the solution is 6-7 to obtain a rare earth solution, adding modified basalt fiber into the rare earth solution, wherein the solid-liquid mass ratio of the modified basalt fiber to the rare earth solution is 1:50, stirring at a speed of 200r/min for 5h, standing for 25h, taking out, transferring into a 110 ℃ drying oven for drying for 15h, taking out, calcining in a muffle furnace at an air atmosphere of 500 ℃ for 5h to obtain the rare earth-loaded modified basalt fiber;
(3) uniformly mixing the rare earth loaded modified basalt fiber and the activated sludge according to the mass ratio of 1:5, and adding the mixture into a bioreactor;
(4) inoculating bacillus coagulans into a beef extract peptone liquid culture medium to prepare a bacterial suspension, carrying out shake culture at 37 ℃ for 5 days, inoculating into a bioreactor, adding a culture solution, aerating for 10 days, completing biofilm culturing, and replacing fresh culture solution every day, wherein the formula of each 1L of the culture solution is as follows:
40g of glucose, 4g of sodium tartrate, K2HPO 41 g, 0.5g of MgSO4.7H2O, 1g of KCl, 0.1g of FeSO4.7H2O and the balance of water;
(5) continuously aerating, mixing the culture solution and the printing and dyeing wastewater according to the volume ratio of 5:1 to replace the culture solution in the bioreactor, culturing for 6d, mixing the culture solution and the printing and dyeing wastewater according to the volume ratio of 1:1, adding the mixture into the bioreactor, culturing for 10d, mixing the culture solution and the printing and dyeing wastewater according to the volume ratio of 1:5, adding the mixture into the bioreactor, culturing for 6d, mixing the culture solution and the printing and dyeing wastewater according to the volume ratio of 1:8, adding the mixture into the bioreactor, culturing for 6d, and completing acclimation;
(6) and (3) placing the bioreactor in a printing and dyeing wastewater pool, treating the printing and dyeing wastewater, measuring the chromaticity every day, and discharging after the wastewater is qualified.
Example 5:
a novel biological method for removing chromaticity in printing and dyeing wastewater comprises the following specific steps:
(1) adding basalt fiber into mixed acid formed by mixing concentrated sulfuric acid and concentrated nitric acid according to the volume ratio of 1:1, heating to 50 ℃, stirring for 20min, fishing out, washing to be neutral, drying, adding into deionized water, adding hexadecyl trimethyl ammonium chloride and KH-550 which are 0.5% and 4% of the mass of the deionized water, heating to 30 ℃, stirring for 1h, fishing out, washing, and drying to obtain modified basalt fiber;
(2) mixing cerium nitrate, yttrium nitrate and erbium nitrate according to a mass ratio of 1:1:1, adding into concentrated hydrochloric acid, heating, stirring and dissolving, heating to 80 ℃ to drive acid, supplementing water in due course to keep the total volume unchanged, cooling to room temperature when the pH of the solution is 6-7 to obtain a rare earth solution, adding modified basalt fiber into the rare earth solution, wherein the solid-liquid mass ratio of the modified basalt fiber to the rare earth solution is 1:50, stirring at a speed of 200r/min for 2 hours, standing for 20 hours, taking out, transferring into a 100 ℃ oven, drying for 12 hours, taking out, calcining in a muffle furnace at an air atmosphere of 450 ℃ for 3 hours to obtain the rare earth-loaded modified basalt fiber;
(3) uniformly mixing the rare earth loaded modified basalt fiber and the activated sludge according to the mass ratio of 1:3, and adding the mixture into a bioreactor;
(4) inoculating bacillus coagulans into a beef extract peptone liquid culture medium to prepare a bacterial suspension, carrying out shake culture at 37 ℃ for 3d, inoculating into a bioreactor, adding a culture solution, aerating for 10d, completing biofilm culturing, and replacing fresh culture solution every day, wherein the formula of each 1L of the culture solution is as follows:
30g of glucose, 2g of sodium tartrate, K2HPO 41 g, 0.5g of MgSO4.7H2O, 0.5g of KCl, 0.1g of FeSO4.7H2O and the balance of water;
(5) continuously aerating, mixing the culture solution and the printing and dyeing wastewater according to the volume ratio of 3:1 to replace the culture solution in the bioreactor, culturing for 3d, mixing the culture solution and the printing and dyeing wastewater according to the volume ratio of 1:1, adding the mixture into the bioreactor, culturing for 10d, mixing the culture solution and the printing and dyeing wastewater according to the volume ratio of 1:3, adding the mixture into the bioreactor, culturing for 3d, mixing the culture solution and the printing and dyeing wastewater according to the volume ratio of 1:8, adding the mixture into the bioreactor, culturing for 3d, and completing acclimation;
(6) and (3) placing the bioreactor in a printing and dyeing wastewater pool, treating the printing and dyeing wastewater, measuring the chromaticity every day, and discharging after the wastewater is qualified.
Example 6:
a novel biological method for removing chromaticity in printing and dyeing wastewater comprises the following specific steps:
(1) adding basalt fiber into mixed acid formed by mixing concentrated sulfuric acid and concentrated nitric acid according to the volume ratio of 1:2, heating to 60 ℃, stirring for 30min, fishing out, washing to be neutral, drying, adding into deionized water, adding hexadecyl trimethyl ammonium chloride and KH-550 with the mass of 1.5% and 8% of the deionized water, heating to 35 ℃, stirring for 3h, fishing out, washing and drying to obtain modified basalt fiber;
(2) mixing cerium nitrate, yttrium nitrate and erbium nitrate according to a mass ratio of 1:1:1, adding into concentrated hydrochloric acid, heating, stirring and dissolving, heating to 90 ℃ to drive acid, supplementing water in due time to keep the total volume unchanged, cooling to room temperature when the pH of the solution is 6-7 to obtain a rare earth solution, adding modified basalt fiber into the rare earth solution, stirring at a speed of 500r/min for 5 hours, standing for 25 hours, taking out, transferring into a 110 ℃ drying oven, drying for 15 hours, taking out, calcining in a muffle furnace at an air atmosphere of 500 ℃ for 6 hours to obtain the rare earth-loaded modified basalt fiber;
(3) uniformly mixing the rare earth loaded modified basalt fiber and the activated sludge according to the mass ratio of 1:10, and adding the mixture into a bioreactor;
(4) inoculating bacillus coagulans into a beef extract peptone liquid culture medium to prepare a bacterial suspension, carrying out shake culture at 37 ℃ for 5 days, inoculating into a bioreactor, adding a culture solution, aerating for 15 days, completing biofilm culturing, and replacing fresh culture solution every day, wherein the formula of each 1L of the culture solution is as follows:
50g of glucose, 4g of sodium tartrate, K2HPO 42 g, 0.8g of MgSO4.7H2O, 1g of KCl, 0.3g of FeSO4.7H2O and the balance of water;
(5) continuously aerating, mixing the culture solution and the printing and dyeing wastewater according to the volume ratio of 5:1 to replace the culture solution in the bioreactor, culturing for 6d, mixing the culture solution and the printing and dyeing wastewater according to the volume ratio of 1:1, adding the mixture into the bioreactor, culturing for 15d, mixing the culture solution and the printing and dyeing wastewater according to the volume ratio of 1:5, adding the mixture into the bioreactor, culturing for 6d, mixing the culture solution and the printing and dyeing wastewater according to the volume ratio of 1:10, adding the mixture into the bioreactor, culturing for 6d, and completing acclimation;
(6) and (3) placing the bioreactor in a printing and dyeing wastewater pool, treating the printing and dyeing wastewater, measuring the chromaticity every day, and discharging after the wastewater is qualified.
Chroma removal test:
the water quality chromaticity was measured by a platinum-cobalt standard colorimetric method, i.e., a standard solution for measuring chromaticity prepared from potassium chloroplatinate and cobalt chloride, and when 2.419mg of potassium chloroplatinate and 2.00mg of cobalt chloride were contained in 1L of water, the color shade produced when the concentration of platinum (Pt) was 1mg per liter was defined as 1 degree (1 °).
COD (chemical oxygen demand) was determined by the potassium dichromate method.
The method of the invention in example 1 was used to detect the chromaticity of the printing and dyeing wastewater over time (from the time when the bioreactor was placed in the printing and dyeing wastewater tank), and the results are shown in table 1 below.
Table 1:
| 0h | 5h | 10h | 15h | 20h | 25h | 30h | |
| colour (degree) | 200 | 164 | 120 | 65 | 23 | 15 | 10 |
| COD（mg/L） | 497 | 350 | 264 | 143 | 76 | 63 | 59 |
As can be seen from the above table, the method for treating the printing and dyeing wastewater has good removal effect on the chroma and the COD, and high removal efficiency, and the chroma and the chemical oxygen demand are qualified after 30 hours of treatment, thereby reaching the discharge standard.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
1. A novel biological method for removing chromaticity in printing and dyeing wastewater is characterized by comprising the following steps:
(1) adding basalt fiber into mixed acid, heating to 50-60 ℃, stirring for 20-30min, taking out, washing with water to neutrality, drying, adding into deionized water, adding hexadecyl trimethyl ammonium chloride and KH-550, heating to 30-35 ℃, stirring for 1-3h, taking out, washing with water, and drying to obtain modified basalt fiber;
(2) preparing a rare earth solution, adding the modified basalt fiber into the rare earth solution, stirring at the speed of 200-;
(3) uniformly mixing the rare earth loaded modified basalt fiber and activated sludge, and adding the mixture into a bioreactor;
(4) inoculating bacillus coagulans into a liquid culture medium to prepare a bacterial suspension, performing shake culture at 37 ℃ for 3-5 days, inoculating into a bioreactor, adding a culture solution, aerating for 10-15 days, completing biofilm culturing, and replacing fresh culture solution every day;
(5) continuously aerating, mixing the culture solution and the printing and dyeing wastewater according to the volume ratio of 3-5:1 to replace the culture solution in the bioreactor, culturing for 3-6 days, mixing the culture solution and the printing and dyeing wastewater according to the volume ratio of 1:1, adding the mixture into the bioreactor, culturing for 10-15 days, mixing the culture solution and the printing and dyeing wastewater according to the volume ratio of 1:3-5, adding the mixture into the bioreactor, culturing for 3-6 days, mixing the culture solution and the printing and dyeing wastewater according to the volume ratio of 1:8-10, adding the mixture into the bioreactor, culturing for 3-6 days, and completing acclimation;
(6) and (3) placing the bioreactor in a printing and dyeing wastewater pool, treating the printing and dyeing wastewater, measuring the chromaticity every day, and discharging after the wastewater is qualified.
2. The novel biological method for removing the chromaticity in the printing and dyeing wastewater according to claim 1, characterized in that the mixed acid is formed by mixing concentrated sulfuric acid and concentrated nitric acid according to the volume ratio of 1: 1-2.
3. The novel biological process for removing chroma in printing and dyeing wastewater as claimed in claim 1, characterized in that cetyltrimethylammonium chloride, KH-550 are 0.5-1.5%, 4-8% of the mass of deionized water.
4. The novel biological process for removing chromaticity from printing and dyeing wastewater according to claim 1, wherein the rare earth solution is prepared by the following method:
mixing cerium nitrate, yttrium nitrate and erbium nitrate according to the mass ratio of 1:1:1, adding into concentrated hydrochloric acid, heating, stirring and dissolving, heating to 80-90 ℃ to drive acid, supplementing water at proper time during the period to keep the total volume unchanged, and cooling to room temperature when the pH value of the solution is 6-7.
5. The novel biological method for removing the chromaticity in the printing and dyeing wastewater as claimed in claim 1, characterized in that the solid-liquid mass ratio of the modified basalt fiber to the rare earth solution is 1: 50-80.
6. The novel biological method for removing the chromaticity in the printing and dyeing wastewater as claimed in claim 1, characterized in that the mixing mass ratio of the rare earth-loaded modified basalt fiber and the activated sludge is 1: 3-10.
7. The novel biological process for removing color from printing and dyeing wastewater according to claim 1, wherein the liquid medium is beef extract peptone liquid medium or LB liquid medium.
8. The novel biological process for removing color from printing and dyeing wastewater according to claim 1, wherein the formulation of each 1L of the culture solution is as follows:
30-50g of glucose, 2-4g of sodium tartrate, 41-2 g of K2HPO, 0.5-0.8g of MgSO4.7H2O, 0.5-1g of KCl, 0.1-0.3g of FeSO4.7H2O and the balance of water.
9. The novel biological process for removing color from printing and dyeing wastewater according to claim 8, wherein the formulation of each 1L of the culture solution is as follows:
35g of glucose, 3g of sodium tartrate, K2HPO 41.2 g, 0.6g of MgSO4.7H 2O, 0.5g of KCl, 0.1g of FeSO4.7H 2O and the balance of water.
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| WO2022163871A1 (en) * | 2021-02-01 | 2022-08-04 | Kabushiki Kaisha Toshiba | Wastewater treatment apparatus and wastewater treatment method |
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