CN110639479A - Rice husk ash/aluminum oxide decolorizing agent for treating printing and dyeing wastewater - Google Patents
Rice husk ash/aluminum oxide decolorizing agent for treating printing and dyeing wastewater Download PDFInfo
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- CN110639479A CN110639479A CN201911081946.4A CN201911081946A CN110639479A CN 110639479 A CN110639479 A CN 110639479A CN 201911081946 A CN201911081946 A CN 201911081946A CN 110639479 A CN110639479 A CN 110639479A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/22—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material
- B01J20/24—Naturally occurring macromolecular compounds, e.g. humic acids or their derivatives
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/06—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising oxides or hydroxides of metals not provided for in group B01J20/04
- B01J20/08—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising oxides or hydroxides of metals not provided for in group B01J20/04 comprising aluminium oxide or hydroxide; comprising bauxite
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/3078—Thermal treatment, e.g. calcining or pyrolizing
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/288—Treatment of water, waste water, or sewage by sorption using composite sorbents, e.g. coated, impregnated, multi-layered
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2220/00—Aspects relating to sorbent materials
- B01J2220/40—Aspects relating to the composition of sorbent or filter aid materials
- B01J2220/48—Sorbents characterised by the starting material used for their preparation
- B01J2220/4875—Sorbents characterised by the starting material used for their preparation the starting material being a waste, residue or of undefined composition
- B01J2220/4881—Residues from shells, e.g. eggshells, mollusk shells
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/30—Nature of the water, waste water, sewage or sludge to be treated from the textile industry
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Abstract
The invention relates to a rice husk ash/alumina decolorant for printing and dyeing wastewater treatment, which is prepared by taking rice husk ash and sodium aluminate as raw materials through the steps of pretreatment of rice husk, carbonization of sodium aluminate, compounding and roasting. The rice husk ash/alumina decolorant is applied to printing and dyeing wastewater treatment, and is combined with UASB (upflow anaerobic sludge blanket), biological contact oxidation and artificial wetland combined process to treat the printing and dyeing wastewater, so that the effluent quality of the printing and dyeing wastewater can reach the standard of 'quality of reuse water in textile printing and finishing industry' (FZ/T01107-2011) and can be reused for production. The rice husk ash/alumina decolorant has the advantages of simple preparation method, convenient use, low operation cost for printing and dyeing wastewater treatment, good treatment effect, and high chroma removal rate of more than 90 percent, and is well applied to the advanced treatment of printing and dyeing wastewater.
Description
Technical Field
The invention relates to a rice husk ash/aluminum oxide decolorizing agent for treating printing and dyeing wastewater, and particularly belongs to the technical field of wastewater treatment.
Background
The printing and dyeing wastewater discharged by the textile printing and dyeing industry is one of important pollution sources in industrial systems in China and also belongs to industrial wastewater which is difficult to treat. With the rapid development of textile printing and dyeing technology and the progress of after-finishing technology, a large amount of dyes and auxiliaries are used, the types of raw materials such as dyes and auxiliaries used in different production processes are different, so that the characteristics of high concentration of organic matters, complex components, large pH change, large water quantity and water quality change, deep and variable chromaticity of printing and dyeing wastewater are caused, and the prominent problems of chromaticity and refractory organic matters in the printing and dyeing wastewater treatment are solved. At present, the printing and dyeing wastewater treatment technology comprises a physical method, an advanced oxidation technology, a biological method, a combined process combining physical chemistry and biochemistry, and the printing and dyeing wastewater decolorization mainly comprises an adsorption method, a coagulation method, an oxidation-reduction method, a biochemical method and a membrane method. The adsorption method is the most widely used one at present, and the adsorbents comprise active carbon, kieselguhr, natural montmorillonite, chitosan and the like. In order to realize standard discharge of wastewater and improve the regeneration utilization rate of the wastewater, the invention uses rice husk waste and sodium aluminate as raw materials, develops rice husk ash/alumina decolorant to be applied to printing and dyeing wastewater treatment, and combines UASB + biological contact oxidation + artificial wetland combined process to treat the printing and dyeing wastewater, so that the water quality of the effluent after the printing and dyeing wastewater treatment can be reused for production after reaching the standards of 'quality of reuse water in textile printing and finishing industry' (FZ/T01107-2011), and the regeneration utilization rate of the wastewater is improved. The rice husk ash/aluminum oxide decolorizing agent has the advantages of simple preparation method, convenient use, low operation cost for printing and dyeing wastewater treatment and good treatment effect, and can be well applied to the advanced treatment of printing and dyeing wastewater.
Disclosure of Invention
The invention aims to provide a novel printing and dyeing wastewater adsorption decolorant to reduce the pollution of printing and dyeing wastewater to the environment and improve the regeneration utilization rate of the wastewater.
The invention relates to a rice husk ash/alumina decolorant for treating printing and dyeing wastewater, which is prepared from rice husk ash and sodium aluminate through pretreatment of rice husk pretreatment, carbonization of sodium aluminate, compounding and roasting, and comprises the following steps:
step 1, husk pretreatment
Soaking the rice husk ash in 5wt% sodium carbonate solution for one night according to the mass ratio of 5: 1, filtering, washing, and centrifuging to obtain pretreated rice husk ash;
step 2: preparing sodium aluminate solution
Slowly adding aluminum hydroxide into a sodium hydroxide solution under the condition of stirring, heating to 70 ~ 95 ℃ after the addition is finished, and stirring for reaction for 1 ~ 3h to obtain a 10-40 wt% sodium aluminate solution;
and step 3: carbonization of sodium aluminate
Adding 10-40 wt% of sodium aluminate solution into a reaction tank with stirring, filling carbon dioxide gas into the bottom of the reaction tank at the stirring speed of 60-120 r/min and the temperature of 10 ~ 15 ℃ until the pH value of a reaction system is 9.0 ~ 11.0.0, and aging the product at the temperature of 30 ~ 80 ℃ for 3 ~ 5h to obtain an intermediate product aluminum hydroxide;
and 4, step 4: compounding and roasting
And (3) adding the pretreated rice hull ash into the aluminum hydroxide prepared in the step (3), uniformly mixing, filtering, washing with water for 1 ~ 2 times, drying the product at 105 +/-5 ℃ and roasting at 350 ~ 500 ℃ to obtain the rice hull ash/alumina decolorizing agent for treating the printing and dyeing wastewater, wherein the mass ratio of the rice hull ash to the alumina is 2-5: 1.
The invention has the beneficial effects that: the rice husk ash/aluminum oxide decolorant is applied to printing and dyeing wastewater treatment, and the printing and dyeing wastewater is treated by combining UASB (upflow anaerobic sludge blanket), biological contact oxidation and artificial wetland combined processes, so that the quality of the effluent after the printing and dyeing wastewater treatment can be reused for production after reaching the standard of 'quality of reuse water in textile printing and finishing industry' (FZ/T01107-2011), and the regeneration utilization rate of the wastewater is improved. The rice husk ash/alumina decolorant has the advantages of simple preparation method, convenient use, low operation cost for printing and dyeing wastewater treatment, good treatment effect, and good application in advanced printing and dyeing wastewater treatment, and the chroma removal rate is more than 90%.
Detailed Description
Example 1
Preparation of rice husk ash/alumina decolorizing agent for treating printing and dyeing wastewater
The method takes rice husk ash and sodium aluminate as raw materials, and prepares the rice husk ash/alumina decolorant by the working procedures of pretreatment of rice husk, carbonization of sodium aluminate, compounding and roasting, and comprises the following steps:
step 1, husk pretreatment
Soaking the rice husk ash in 5wt% sodium carbonate solution for one night according to the mass ratio of 5: 1, filtering, washing, and centrifuging to obtain pretreated rice husk ash;
step 2: preparing sodium aluminate solution
Slowly adding aluminum hydroxide into a sodium hydroxide solution under the condition of stirring, heating to 75 ℃ after the addition is finished, and stirring for reacting for 3 hours to obtain a 35wt% sodium aluminate solution;
and step 3: carbonization of sodium aluminate
Adding 35wt% sodium aluminate solution into a reaction tank with stirring, filling carbon dioxide gas into the bottom of the reaction tank at the stirring speed of 70 r/min and the temperature of 11 ℃ until the pH value of a reaction system is 9.0 ~ 11.0.0, and aging the product at the temperature of 40 ℃ for 5 hours to obtain an intermediate product aluminum hydroxide;
and 4, step 4: compounding and roasting
Adding the pretreated rice hull ash into the aluminum hydroxide prepared in the step 3, uniformly mixing, filtering, washing for 2 times, drying the product at 105 +/-5 ℃ for 6 hours, and roasting at 350 ~ 500 ℃ for 5 times to obtain the rice hull ash/alumina decolorizing agent for treating the printing and dyeing wastewater, wherein the mass ratio of the rice hull ash to the alumina is 4: 1.
Example 2
Application of rice husk ash/aluminum oxide decolorant in printing and dyeing wastewater treatment
Printing and dyeing wastewater quality:
COD is 800-1500 mg/L, BOD is 250-600 mg/L, SS is 200-500 mg/L, chroma is 200-500 times, and pH value is 8-12.
The process of the wastewater treatment method is as follows:
(1) and removing larger impurities in the printing and dyeing wastewater through the grating and the wool fishing machine, wherein the wastewater after the grating flows into the regulating tank.
The width of the grid gaps is 10mm, the inclination angle of the grid is 60 degrees, and the number of the grid gaps is 16. The width of the grid bars is 10m, the width of the grid grooves is 500mm, and a 30-mesh stainless steel wool fishing machine is additionally arranged behind the grids.
(2) The quality and the quantity of the printing and dyeing wastewater are balanced and homogenized through the regulating tank, and the effective hydraulic retention time is 12 hours. A PH meter is arranged in the adjusting tank, and the PH value of the wastewater is controlled to be less than or equal to 10; the spraying cooling system is arranged, when the temperature T in the pool is more than or equal to 35 ℃, the booster pump is started, water is pressurized by the pump and then sprayed into the air through the nozzle, and the water temperature in the pool is reduced by utilizing the heat absorbed when the water is evaporated. Set up aeration agitating unit, regularly carry out the mixed effect of aeration stirring in order to guarantee waste water.
(3) And the wastewater is balanced and homogenized by the regulating tank and then pumped into the UASB + biological contact oxidation tank integrated combined tank by the lift pump. The combined pool is a semi-underground reinforced concrete pool, the plane size is L multiplied by B multiplied by H = 12.0 multiplied by 10.0m, the underground part is UASB and is 4.5m high, and the overground part is a biological contact oxidation pool and is 5.5m high. The effective hydraulic retention time was 12.0 hours.
The thickness of the UASB sludge bed is controlled between 2 m and 3m, and the elastic filler is suspended in the sludge suspension zone. The wastewater flows upward from the bottom and is mixed and contacted with sludge at the bottom of the anaerobic sludge bed, and organic matters in the wastewater are adsorbed and decomposed by microorganisms in the sludge. And (4) periodically discharging anaerobic sludge at the bottom to a sludge concentration tank. An umbrella-shaped cover is arranged at the contact part of the top of the anaerobic zone and the aerobic zone to prevent the phenomenon of sludge floating and loss when pulse water enters.
The wastewater treated by the anaerobic zone rises to enter the aerobic zone, the aerobic zone is filled with the filler, a large number of microorganisms exist on the filler in a proper living environment to form a good biological community, the microorganisms are adsorbed, adhered, collided and captured in an aerobic condition to contact organic substances in the wastewater, assimilation and dissimilation are carried out, organic substances in the wastewater are oxidatively decomposed and assimilated to form carbon dioxide, water and cell substances, and self-metabolism and proliferation are completed. And the residual sludge is periodically discharged to a sludge concentration tank. The aerobic zone is provided with a blast aeration system. The top of the aerobic zone is provided with a three-phase separator. And the effluent is drained by an overflow weir, most of the sinking sludge circularly flows back to the aerobic zone, and a small part of the sludge falls back to the anaerobic zone.
(4) And (4) enabling the wastewater to enter a secondary sedimentation tank from the contact oxidation tank for solid-liquid separation, and discharging the supernatant into a coagulating sedimentation tank. Returning a part of the precipitated sludge to the contact oxidation pond to supplement the sludge; discharging the residual sludge into a sludge concentration tank. The secondary sedimentation tank adopts a radial flow sedimentation tank and a semi-underground reinforced concrete structure, has the size of phi 6.5m, is PIKHz 6.5m, and is provided with 1 central transmission type mud scraper.
(5) Coagulating sedimentation tank
The coagulating sedimentation tank comprises a coagulating reaction zone and a sedimentation zone, and the coagulating reaction zone is provided with two sets of medicament adding devices. One set is to add rice husk ash/alumina decolorant, and the other set is coagulant aid PAC. The adding amount of the rice husk ash/aluminum oxide decolorant is 5g/L of the treated water amount, and the adding amount of the coagulant aid PAC is 0.2g/L of the treated water amount.
The plane size of the coagulation basin is L multiplied by B multiplied by H = 4.5 multiplied by 4.0 multiplied by 3.5m, and 2 groups are used in series. The sedimentation tank is of an inclined plate type, and the plane area is 180m2The size is L × B × H = 8.0 × 22.5 × 3.5m, and the two cells are used in parallel. The bottom is provided with a V-shaped sludge collecting groove, and the inclination angle of the sludge bucket is more than or equal to 63 degrees.
(6) Artificial wet land
The artificial wetland system adopts a process of combining an underflow wetland and a surface flow wetland, and the artificial wetland treatment system comprises a treatment unit consisting of soil, microorganisms, plankton and reeds. The reed wetland has higher treatment efficiency on nitrogen, phosphorus and organic matters. About 1800m of artificial wetland2It is composed of shallow water reservoir lined with impervious material layer, soil or gravel matrix and reed. The middle of the water distribution pipe is provided with a water distribution pipe network.
(7) Sludge thickening tank
Effective volume 300m of sludge concentration tank3Total depth of 3.5m and plane area of 108m2And the size is L × B × H = 18.0 × 6.0 × 3.5 m. And discharging the sludge into a presser for drying, transporting the sludge outwards, and discharging the filtrate into a regulating tank.
Water quality after printing and dyeing wastewater treatment:
COD is 48.7-49.7 mg/L, BOD is 22.5-23.7 mg/L, SS is 28.7-30 mg/L, and chroma is 23.9-25 times.
After the printing and dyeing wastewater is treated by the processes, the removal rate of COD (chemical oxygen demand) is more than 95%, the removal rate of BOD (biochemical oxygen demand) is more than 94%, the removal rate of SS (suspended substances) is more than 92%, and the removal rate of chromaticity is more than 93%, so that the printing and dyeing wastewater can stably reach the standard of the quality of reuse water in the textile printing industry (FZ/T01107-2011).
Claims (1)
1. A rice husk ash/alumina decolorant for treating printing and dyeing wastewater is characterized in that: the rice husk ash/alumina decolorant is prepared by taking rice husk ash and sodium aluminate as raw materials through the working procedures of pretreatment of rice husk, carbonization of sodium aluminate, compounding and roasting, and comprises the following specific steps:
step 1, husk pretreatment
Soaking the rice husk ash in 5wt% sodium carbonate solution for one night according to the mass ratio of 5: 1, filtering, washing, and centrifuging to obtain pretreated rice husk ash;
step 2: preparing sodium aluminate solution
Slowly adding aluminum hydroxide into a sodium hydroxide solution under the condition of stirring, heating to 70 ~ 95 ℃ after the addition is finished, and stirring for reaction for 1 ~ 3h to obtain a 10-40 wt% sodium aluminate solution;
and step 3: carbonization of sodium aluminate
Adding 10-40 wt% of sodium aluminate solution into a reaction tank with stirring, filling carbon dioxide gas into the bottom of the reaction tank at the stirring speed of 60-120 r/min and the temperature of 10 ~ 15 ℃ until the pH value of a reaction system is 9.0 ~ 11.0.0, and aging the product at the temperature of 30 ~ 80 ℃ for 3 ~ 5h to obtain an intermediate product aluminum hydroxide;
and 4, step 4: compounding and roasting
And (3) adding the pretreated rice hull ash into the aluminum hydroxide prepared in the step (3), uniformly mixing, filtering, washing with water for 1 ~ 2 times, drying the product at 105 +/-5 ℃ and roasting at 350 ~ 500 ℃ to obtain the rice hull ash/alumina decolorizing agent for treating the printing and dyeing wastewater, wherein the mass ratio of the rice hull ash to the alumina is 2-5: 1.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911081946.4A CN110639479A (en) | 2019-11-07 | 2019-11-07 | Rice husk ash/aluminum oxide decolorizing agent for treating printing and dyeing wastewater |
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| CN201911081946.4A CN110639479A (en) | 2019-11-07 | 2019-11-07 | Rice husk ash/aluminum oxide decolorizing agent for treating printing and dyeing wastewater |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101670278A (en) * | 2009-09-22 | 2010-03-17 | 江汉大学 | Method for preparing desulfurization absorbent by using rice husk ash |
| CN104307469A (en) * | 2014-09-29 | 2015-01-28 | 中国石油化工股份有限公司 | Desulfurization absorbent for deeply desulfurizing refined diesel oil and preparation method of desulfurization absorbent |
| CN105056894A (en) * | 2015-08-11 | 2015-11-18 | 常州大学 | Novel adsorbent |
| CN106824143A (en) * | 2017-01-03 | 2017-06-13 | 张云波 | A kind of novel forming activated carbon and preparation method thereof |
-
2019
- 2019-11-07 CN CN201911081946.4A patent/CN110639479A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101670278A (en) * | 2009-09-22 | 2010-03-17 | 江汉大学 | Method for preparing desulfurization absorbent by using rice husk ash |
| CN104307469A (en) * | 2014-09-29 | 2015-01-28 | 中国石油化工股份有限公司 | Desulfurization absorbent for deeply desulfurizing refined diesel oil and preparation method of desulfurization absorbent |
| CN105056894A (en) * | 2015-08-11 | 2015-11-18 | 常州大学 | Novel adsorbent |
| CN106824143A (en) * | 2017-01-03 | 2017-06-13 | 张云波 | A kind of novel forming activated carbon and preparation method thereof |
Non-Patent Citations (8)
| Title |
|---|
| W. M. YOUSSEF ET AL.: "Synthesis, characterization and application of composite derived from rice husk ash with aluminium oxide for sorption of uranium", 《ADSORPTION SCIENCE & TECHNOLOGY》 * |
| 刘伶等: "改性稻壳灰对废水中苯酚吸附性能的研究", 《科学技术创新》 * |
| 吕少仿: "《绿色生化技术与小城镇可持续发展》", 31 December 2017, 华中科技大学出版社 * |
| 吴晓等: "UASB+生物接触氧化组合工艺处理纺织印染废水工程实例", 《江西化工》 * |
| 秦浩正: "《中学生学习辞典 化学卷》", 30 September 2012, 上海世界图书出版公司 * |
| 谢杰等: "稻壳发电残余物稻壳灰对有机物的吸附作用", 《农业工程学报》 * |
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Application publication date: 20200103 |