CN110407352B - Method for treating biomass pyrolysis aqueous solution product - Google Patents
Method for treating biomass pyrolysis aqueous solution product Download PDFInfo
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- CN110407352B CN110407352B CN201910365765.8A CN201910365765A CN110407352B CN 110407352 B CN110407352 B CN 110407352B CN 201910365765 A CN201910365765 A CN 201910365765A CN 110407352 B CN110407352 B CN 110407352B
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- aqueous solution
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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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
- C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/722—Oxidation by peroxides
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- 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)
- Water Treatment By Sorption (AREA)
- Removal Of Specific Substances (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention discloses a method for treating a biomass pyrolysis aqueous solution productThe industrial wastewater as a biomass pyrolysis aqueous solution product is treated as a raw material, is heated and kept warm and then is cooled, PAM, aluminum salt, activated carbon and activated carbon or carclazyte are sequentially added into the cooled wastewater solution, corresponding reagents are added respectively and then are filtered, and finally hydrogen peroxide is added to complete the treatment. The invention can effectively BOD in biomass pyrolysis aqueous solution product5And pollutants such as ammonia nitrogen, total phosphorus, COD and the like are treated, so that the water quality is effectively improved, and the industrial process is easy to control and the quantitative operation is easy to control.
Description
Technical Field
The invention relates to a sewage treatment technology, in particular to a method for treating a biomass pyrolysis aqueous solution product by treating an aqueous solution containing a large amount of chemical substances in a biomass pyrolysis process.
Background
The aqueous solution product in the biomass thermal cracking process is formed by carbonizing trees, converting the energy of the trees into gas and naturally cooling the gas into concentrated liquid, wherein the produced aqueous solution containing a large amount of chemical substances has high chromaticity of sewage, high pollutant content in the sewage, more substances which are difficult to biodegrade, low B/C ratio, poor biodegradability, more toxic and harmful substances, complex water quality components and more byproducts, and reaction raw materials are often solvent substances or compounds with annular structures, so that the difficulty in treating the sewage is increased. If the waste water is directly discharged without treatment, the waste water has great influence on the surrounding environment.
In the prior art, flocculation is widely used in sewage treatment processes as one of the most important water pollution control methods. Among them, aluminum salt is a commonly used flocculant, which is first ionized into Al when put into water3+Ions, Al3+OH produced by ionization with water-The aluminum hydroxide is generated by combination, colloid particles of the aluminum hydroxide have positive charges, and the aluminum hydroxide and colloid particles with the negative charges have the effects of anisotropic electro-attraction and electro-neutralization, are gradually condensed into thick floccules, and then are settled under the action of gravity to remove suspended matters and colloids in water, and in addition, the aluminum salt can bring additional settling effect along with other physical effects such as surface contact effect, net catching effect and the like besides the chemical effect of the aluminum salt. In order to improve the flocculation effect, there are also methods using polyAcrylamide (PAM) is used as a flocculating agent, PAM is used as a linear organic high molecular polymer, the action mechanism of the PAM is basically the same as that of aluminum salt, but the formed colloid has larger molecular weight and longer colloid chain, and can play a role of bridging among particles when adsorbing suspended particles in water, so that fine particles form larger flocs and the sedimentation speed is accelerated, thereby being more suitable for treating high-turbidity sewage. In addition, experiments prove that PAM has good space for improving turbidity and chromaticity by utilizing the adsorption and bridging effects of PAM in drinking water treatment. But the toxicity of the monomer greatly increases the quality control requirement and limits the use of the monomer.
At present, domestic wastewater treatment aiming at biomass pyrolysis is not reported, domestic industrial wastewater treatment modes are single, but industrial water treatment components are increasingly complex and increasingly difficult, and when a single flocculating agent is used for treating the effect, the effect of the flocculating agent is far from lagging behind the treatment requirement of increasing day by day. However, from the current situation of water treatment agents at home and abroad, further research and development are needed in variety, performance, technological method and cost.
Disclosure of Invention
The technical problem solved by the invention is to provide a method for treating a biomass pyrolysis aqueous solution product, which is convenient for carrying out effective multidimensional purification treatment on wastewater by selecting a proper water treatment agent and matching with a specific physical and chemical combined treatment step, has simple process flow and high treatment efficiency, and can be used for solving the defects in the technical background.
The technical problem solved by the invention is realized by adopting the following technical scheme:
a method for treating a biomass pyrolysis aqueous solution product specifically comprises the following operation steps:
s1: heating industrial wastewater serving as a biomass pyrolysis water solution product to 90-100 ℃, preserving heat for 8-12 min, and then cooling the heat-preserved stock solution to 20-50 ℃ for filtering.
S2: and (4) adding PAM into the filtrate treated in the step S1, and filtering after the reaction is finished.
S3: and heating the filtrate treated in the step S2 to 40-60 ℃, adding aluminum salt, and filtering after the reaction is finished.
S4: and (4) adding activated carbon accounting for 7-15% of the mass of the filtrate into the filtrate treated in the step S3, filtering through a filter screen of 1-3 mu m after the reaction is completed, adjusting the pH value of the filtrate to be neutral, and filtering.
S5: and (4) adding activated carbon or argil accounting for 5% of the mass of the filtrate into the filtrate after the step S4, and filtering.
S6: and (4) adding hydrogen peroxide into the filtrate treated in the step S5, and finishing treatment after complete reaction.
In the further limitation, in the filtering process of the solution in the steps S1, S2, S3, S4 and S5, the filtering is performed by a filter screen with the diameter of 30-50 μm except that the filtering is performed by a filter screen with the diameter of 1-3 μm after the first active carbon adding reaction is completed.
In a further limitation, the adding amount of the PAM in the step S2 is 0.1-1.0% of the mass percentage of the stock solution.
In step S2, in order to achieve the effects of fully reacting and effectively reducing the dosage of the drug, the filtrate is stirred and reacted at a rotation speed of 2000-3000 r/min after PAM is added, and the reaction time is 20-60 min.
In the step S3, the amount of the aluminum salt added is 5-10% of the mass concentration of the filtrate.
In step S3, to achieve the effects of fully reacting and effectively reducing the dosage of the chemical, the filtrate is stirred at 2000-3000 r/min for 10-30 min after adding the aluminum salt, and then is left to stand at 30-40 ℃ for 30-60 min before performing the filtering operation.
The activated carbon adopted in the steps S4 and S5 is powder activated carbon, and compared with common activated carbon, the powder activated carbon has the characteristics of large surface area, stronger adsorption force, high purity, high filtration speed, stable quality, flocculation effect, filtration assisting effect and the like.
As a further limitation, the concentration of the hydrogen peroxide added in the step S6 is 30%, and the adding amount thereof is preferably 4-10% of the volume percentage of the solution.
In step S6, in order to promote the reaction between hydrogen peroxide and the solution, the solution is stirred at room temperature after adding hydrogen peroxide, the stirring speed is controlled to be 100-300 r/min, and the reaction time is 200-800 min.
Has the advantages that: according to the method for treating the biomass pyrolysis aqueous solution product, the water body which is colorless, tasteless and free of harmful substances is obtained by reasonably selecting the proper water treatment agent and the optimal proportion of each medicament and adding the proper physical treatment in order adjustment and matching. The method has the advantages of simple process flow, high working efficiency, no secondary pollutant generation, effective improvement of water utilization rate, reduction of resource waste, realization of industrial large-scale treatment and environmental friendliness.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easily understood, the invention is further described with reference to the specific embodiments.
The first embodiment is as follows:
in the first embodiment, the rice hulls are used as raw materials to prepare the industrial wastewater generated by the rice hull thermal cracking liquid as the raw materials.
During treatment, large-particle solid impurities are removed through solid-liquid separation, then the separated industrial wastewater is heated to 100 ℃, the temperature is kept for 8min, then the stock solution is cooled to 40 ℃, and the cooled stock solution is filtered through a filter screen with the diameter of 50 mu m to remove suspended impurities. Adding PAM accounting for 0.75 percent of the mass of the stock solution into the liquid, then adding the PAM into a reaction kettle, stirring and reacting the PAM in the reaction kettle for 60min at the rotating speed of 2200r/min by using a stirring device, and filtering impurities after the reaction is finished. Heating the liquid obtained after filtering impurities to 60 ℃, adding aluminum salt with the mass concentration of 9%, stirring for 28min under the speed of 2200r/min, standing for 60min under the temperature of 35 ℃, filtering and separating through a 30-micrometer filter screen, and removing pasty impurities to obtain filtrate.
Adding activated carbon accounting for 15% of the filtrate by mass into the filtrate, standing for reaction for 1h, and filtering through a filter screen with the diameter of 3 mu m; dropwise adding NaOH solution into the filtrate, adjusting the filtrate to be neutral, and filtering through a 30-micron filter screen; adding argil accounting for 5% of the mass of the filtrate into the filtered filtrate, and filtering through a 30-micrometer filter screen again; adding 30% hydrogen peroxide accounting for 8% of the filtrate volume into the filtrate, stirring at the normal temperature at the rotating speed of 200r/min, and reacting for 600min to finish the purification treatment operation. The important detection factor components in the industrial wastewater before and after treatment were detected to obtain data shown in table 1:
example two:
in the second embodiment, waste branches are used as raw materials to prepare the industrial wastewater generated by the rice hull thermal cracking liquid as the raw materials.
During treatment, large-particle solid impurities are removed through solid-liquid separation, industrial wastewater generated in a biomass thermal cracking process is heated to 100 ℃, kept for 10min and then cooled to 30 ℃, then filtered through a 40-micron filter screen, PAM with the mass percent of 0.15% of the original solution is added into the filtrate, stirred for 30min under the condition of 2000r/min, the solution is heated to 60 ℃ after full reaction, aluminum salt with the mass percent of 7.5% of the solution is added, stirred for 30min under the condition of 3000r/min, kept at 32 ℃ and kept stand for 60min, then filtered through a 40-micron filter screen, activated carbon with the mass percent of 8% of the filtrate is added, reaction is carried out for 1h, then filtered through a 1-micron filter screen, the pH of the liquid is adjusted to be neutral, filtered through a 40-micron filter screen, activated carbon with the mass percent of the filtrate of 5% of the filtrate is added into the filtrate, filtered through a 40-micron filter screen, finally hydrogen peroxide (with the concentration of 30%) with the volume percent of the filtrate is added into the filtrate, stirring at normal temperature, controlling the rotating speed to be 300r/min, reacting for 500min to obtain a treated water sample, and detecting important detection factor components in the industrial wastewater water sample before and after treatment to obtain data shown in Table 2.
As can be seen from the above tables 1 and 2, the concentration of the basic wastewater discharge control project is reduced, the treatment rate of each pollutant is more than 95%, the treatment effect is obvious, the water liquid obtained after filtration is clear in color and free of special odor, and meanwhile, the water liquid is easy to control and quantify through an industrial process, so that the water quality pollution can be effectively improved, the utilization rate of water is improved, and the waste of water resources and the environmental pollution can be reduced, thereby the invention has better economical efficiency and environmental protection.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, and that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. A method for processing biomass pyrolysis aqueous solution products is characterized by comprising the following operation steps:
s1: heating industrial wastewater serving as a biomass pyrolysis water solution product to 90-100 ℃, preserving heat for 8-12 min, and then cooling the heat-preserved stock solution to 20-50 ℃ for filtering;
s2: adding PAM into the filtrate treated in the step S1, and filtering after the reaction is finished;
s3: heating the filtrate treated in the step S2 to 40-60 ℃, then adding aluminum salt, and filtering after the reaction is finished;
s4: adding activated carbon accounting for 7-15% of the mass of the filtrate into the filtrate treated in the step S3, filtering through a filter screen of 1-3 mu m after complete reaction, adjusting the pH value of the filtrate to be neutral, and filtering;
s5: adding activated carbon or argil accounting for 5% of the mass of the filtrate into the filtrate treated in the step S4 again, and then filtering;
s6: and (4) adding hydrogen peroxide into the filtrate treated in the step S5, and finishing treatment after complete reaction.
2. The method for treating the biomass pyrolysis aqueous solution product as claimed in claim 1, wherein in the filtering process of the solution in the steps S1, S2, S3, S4 and S5, the filtering is performed by a 30-50 μm filter screen except that the activated carbon is added in the step S4 for the first time, and the filtering is performed by a 1-3 μm filter screen after the reaction is completed.
3. The method for treating the biomass pyrolysis aqueous solution product according to claim 1, wherein the amount of PAM added in the step S2 is 0.1-1.0% by mass of the stock solution.
4. The method for treating the biomass pyrolysis aqueous solution product according to claim 1, wherein in the step S2, the filtrate is stirred and reacted at a rotation speed of 2000-3000 r/min after PAM is added, and the reaction time is 20-60 min.
5. The method for treating the biomass pyrolysis aqueous solution product according to claim 1, wherein in the step S3, the filtrate is stirred and reacted for 10-30 min under 2000-3000 r/min after the aluminum salt is added, and then is kept stand for 30-60 min under the temperature condition of 30-40 ℃ before being filtered.
6. The method for treating a biomass pyrolysis aqueous solution product according to claim 1, wherein the activated carbon used in the steps S4 and S5 is powdered activated carbon.
7. The method for treating the biomass pyrolysis aqueous solution product as claimed in claim 1, wherein the concentration of the hydrogen peroxide added in the step S6 is 30%, and the adding amount of the hydrogen peroxide is 4-10% of the volume percentage of the solution.
8. The method for treating the biomass pyrolysis aqueous solution product as claimed in claim 1, wherein the solution is stirred and reacted at normal temperature after hydrogen peroxide is added, the stirring speed is 100-300 r/min, and the reaction time is 200-800 min.
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Citations (8)
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| CN103145299A (en) * | 2013-03-26 | 2013-06-12 | 哈尔滨工业大学 | Advanced treatment method for Lurgi coal gasification wastewater |
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| CN107381879A (en) * | 2017-09-05 | 2017-11-24 | 浙江大学宁波理工学院 | A kind of method for handling gasification of biomass gas washing wastewater and recycling wastewater treatment product |
| CN108946883A (en) * | 2018-08-10 | 2018-12-07 | 安徽科技学院 | Handle the method and dedicated reactor tank of biomass thermal liquid waste solution |
| CN108975616A (en) * | 2018-08-01 | 2018-12-11 | 启迪桑德环境资源股份有限公司 | Handle the system and method for biomass pyrolytic water |
-
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- 2019-04-24 CN CN201910365765.8A patent/CN110407352B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS6214985A (en) * | 1985-07-15 | 1987-01-23 | Mitsui Toatsu Chem Inc | Method for removing phosphorus |
| CN101987762A (en) * | 2009-08-03 | 2011-03-23 | 上海未来企业有限公司 | Coking wastewater treatment device and coking wastewater posttreatment method |
| CN101654316A (en) * | 2009-09-27 | 2010-02-24 | 新奥科技发展有限公司 | Method for processing coal gasification wastewater |
| CN103145299A (en) * | 2013-03-26 | 2013-06-12 | 哈尔滨工业大学 | Advanced treatment method for Lurgi coal gasification wastewater |
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