WO2020177264A1 - Procédé de traitement de liquide résiduaire de déchets de filtre à particules diesel d'un moteur diesel, liquide résiduaire obtenu par traitement et utilisation de celui-ci - Google Patents

Procédé de traitement de liquide résiduaire de déchets de filtre à particules diesel d'un moteur diesel, liquide résiduaire obtenu par traitement et utilisation de celui-ci Download PDF

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Publication number
WO2020177264A1
WO2020177264A1 PCT/CN2019/096703 CN2019096703W WO2020177264A1 WO 2020177264 A1 WO2020177264 A1 WO 2020177264A1 CN 2019096703 W CN2019096703 W CN 2019096703W WO 2020177264 A1 WO2020177264 A1 WO 2020177264A1
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Prior art keywords
diesel engine
waste liquid
solution
engine dpf
cleaning
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PCT/CN2019/096703
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English (en)
Chinese (zh)
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孙丽媛
陈毛毛
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江苏可兰素汽车环保科技有限公司
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Publication of WO2020177264A1 publication Critical patent/WO2020177264A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00—Multistage treatment of water, waste water or sewage
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • 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
    • C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
    • C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
    • 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

Definitions

  • the invention relates to a waste water treatment method, a cleaning liquid obtained by the treatment and its application, and in particular to a method for treating a diesel engine DPF cleaning waste liquid and the cleaning liquid obtained by the treatment and its application.
  • Diesel vehicles have the advantages of low fuel consumption, high torque output, and wide power coverage. They are widely used in transportation and construction machinery. With the tightening of automobile emission regulations, diesel vehicles can only meet the stringent emission regulations in the future if they adopt aftertreatment devices.
  • the emissions of HC, CO, and NOx in the exhaust of diesel vehicles are less than those of gasoline vehicles.
  • the disadvantage is that the emissions of soot particles in the exhaust are higher than that of gasoline vehicles, or even dozens of times higher.
  • the solid pollutants emitted by diesel engines are mainly particulate matter, which is composed of dry soot (SOOT), soluble organic components (SOF), and a small amount of sulfuric acid and sulfate.
  • Diesel particulate filter can effectively reduce diesel particulate emissions, but with the increase in mileage, more and more particulates are deposited in the trap, resulting in an increase in exhaust back pressure, and the economy and power of the engine Therefore, the trapped combustible particles must be removed in time to realize the regeneration of the particle trap.
  • the exhaust temperature is generally 250-500°C
  • the ignition point of particles is generally 550-600°C. It is difficult to regenerate the trap depending on the exhaust of the diesel engine. Oxidizing and burning the particles trapped in the DPF is now a common DPF regeneration method, but this method is likely to cause thermal damage to the filter.
  • the application number is CN201711463677.9.
  • the cleaning and regenerating effect on blocked DPF is very obvious, but after cleaning, a large amount of cleaning waste liquid will be produced, and the waste liquid is in the micron level.
  • the carbon smoke particles are highly dispersed to form a uniformly dispersed waste liquid.
  • Direct discharge leads to waste of resources and serious excess of suspended solids in the wastewater may cause environmental pollution, which needs to be recycled after recycling.
  • the traditional separation method is solid-liquid separation, specifically sedimentation, filtration, centrifugation, etc., but the waste liquid generated after cleaning the blocked DPF, in which the solid particles are micron-sized, uniformly dispersed, and the number is large.
  • the traditional solid-liquid The separation methods are difficult to realize the recovery of the waste liquid after DPF cleaning, and the waste liquid needs to be recycled after special treatment, and then recycled.
  • the first objective of the present invention is to provide a safe and efficient method for the treatment of diesel engine DPF cleaning waste liquid that enables the treated waste liquid to reach the standard for direct recycling and utilization;
  • the second object of the present invention is to provide a cleaning solution obtained by processing
  • the third object of the present invention is to provide the application of cleaning liquid.
  • the method for processing diesel engine DPF cleaning waste liquid of the present invention includes the following steps:
  • the preliminary filtration in step (1) is to filter out particles with a diameter of more than 50 ⁇ m in the waste liquid.
  • the preliminary filtration in step (1) is the preliminary filtration by means of filter press.
  • the polymer inorganic coagulant contained in the polymer inorganic coagulant aid solution added in step (2) accounts for 0.1 to 5% of the mass fraction of the polymer inorganic coagulant aid solution; the added polymer organic flocculant The polymer organic flocculant contained in the solution accounts for 0.1 to 1% of the mass fraction of the polymer organic flocculant solution.
  • the polymer inorganic flocculant is one of polyaluminum chloride, polyaluminum sulfate, and polyaluminum ferric sulfate; the polymer organic flocculant is anionic polyacrylamide, cationic polyacrylamide and One of non-ionic polyacrylamide.
  • the flocculation effect of the inorganic salt flocculant solution is good, and the "bridging" effect of the polymer organic flocculant solution makes the flocculation speed faster The advantages of this can effectively speed up the flocculation speed, so that the treated cleaning fluid can reach a higher standard.
  • the stirring speed is 100-400 r/min; the stirring time is 10-30 min; and the standing time is 1-5 h.
  • the stirring speed is 100-400 r/min; the stirring time is 10-30 min; and the standing time is 1-5 h.
  • the coarse filtration in step (3) is static pressure filtration.
  • the soot particles in the DPF cleaning waste liquid are flocculated, they are subjected to electrostatic attraction and chemical bonding to form an agglomerated floc system, but the flocculation system is not strong and will still deform once the force is applied. Therefore, after the flocculation of the DPF cleaning liquid, further
  • the filtration should adopt static pressure filtration, for example, it can be transported by a pump and filtered through a filter.
  • the coarse filtration in step (3) can be an XF450 filter
  • the filter screen is a 300 mesh stainless steel filter screen
  • a peristaltic pump is used to transport the flocculation system.
  • the compliance standard of the cleaning solution in step (4) is to use pure water as a reference sample and detect at a wavelength of 550 nm, and the absorbance is below 0.05.
  • the detection instrument can be a 721 spectrophotometer.
  • the invention also provides a cleaning liquid obtained by the treatment method of the diesel engine DPF cleaning waste liquid, and the cleaning liquid can be directly recycled and reused.
  • the method for treating diesel engine DPF cleaning waste liquid provided by the present invention enables the treated waste liquid to reach the standard for direct recycling and utilization, which is safe and efficient; among them, the flocculant is used in combination with a polymer inorganic flocculant and a polymer organic flocculant.
  • Inorganic salt flocculant has good flocculation effect, and the "bridging" effect of polymer organic flocculant makes the flocculation speed faster.
  • This compound system combines the advantages of both, especially the flocculation speed. It only takes 10 minutes for 200L diesel engine DPF cleaning waste liquid. A stable flocculent precipitate can be formed from left to right, which shortens the recycling time of the DPF cleaning waste liquid of the blocked diesel engine. At the same time, the treated cleaning liquid can reach a higher standard.
  • Fig. 1 is a flow chart of a method for processing diesel engine DPF cleaning waste liquid of the present invention.
  • the method for processing diesel engine DPF cleaning waste liquid of the present invention is mainly aimed at the recovery processing method of blocking DPF cleaning waste liquid, which includes the following steps:
  • Step 1 Perform a primary filtration on the waste liquid generated after the clogged diesel engine is cleaned to filter out particles larger than 50 ⁇ m in the waste liquid.
  • the primary filtration uses a small plate and frame filter press and the filter cloth uses polyester filter cloth.
  • Step 2 Add 4% by mass polyaluminum chloride solution and 0.1% by mass cationic polyacrylamide solution to the suspension obtained after step one in sequence, and a large amount of black is produced immediately after adding the polyaluminum chloride solution After adding the cationic polyacrylamide solution to the alum flower, a large floccule was formed and suspended in the solution, stirred at 100r/min for 30min, and allowed to stand for 1h.
  • Step 3 Perform secondary coarse filtration on the flocculation system obtained in Step 2 to filter out the flocculated sediments.
  • the secondary coarse filtration uses XF450 filter, peristaltic pump to transport the flocculation system, filter through 300 mesh filter, DPF cleans the carbon in the waste liquid After the smoke particles are flocculated, they are subjected to electrostatic attraction and chemical bonding to form an agglomerated floc system, but the strength of the flocculation system is not high, and deformation will still occur once the force is applied. Therefore, the flocculation and filtration of the DPF cleaning solution should adopt static pressure filtration.
  • Step 4 The filtrate obtained in Step 3 is subjected to membrane filtration treatment to obtain the recovered cleaning solution.
  • the method for processing diesel engine DPF cleaning waste liquid of the present invention is mainly aimed at the recovery processing method of blocking DPF cleaning waste liquid, which includes the following steps:
  • Step 1 Perform a primary filtration on the waste liquid generated after the clogged diesel engine is cleaned to filter out particles larger than 50 ⁇ m in the waste liquid.
  • the primary filtration uses a small plate and frame filter press and the filter cloth uses polyester filter cloth.
  • Step 2 Add 1% mass fraction of polyaluminum ferric sulfate solution and 1% mass fraction of anionic polyacrylamide solution to the suspension obtained after step one in sequence. After adding the polyaluminum ferric sulfate solution, a large amount of After adding the black alum, the anionic polyacrylamide solution immediately formed large flocs and suspended in the solution, stirred at 400r/min for 20min, and allowed to stand for 5h.
  • Step 3 Perform secondary coarse filtration on the flocculation system obtained in Step 2 to filter out the flocculated sediments.
  • the secondary coarse filtration uses XF450 filter, peristaltic pump to transport the flocculation system, filter through 300 mesh filter, DPF cleans the carbon in the waste liquid After the smoke particles are flocculated, they are subjected to electrostatic attraction and chemical bonding to form an agglomerated floc system, but the strength of the flocculation system is not high, and deformation will still occur once the force is applied. Therefore, the flocculation and filtration of the DPF cleaning solution should adopt static pressure filtration.
  • Step 4 The filtrate obtained in Step 3 is subjected to membrane filtration treatment to obtain the recovered cleaning solution.
  • the method for processing diesel engine DPF cleaning waste liquid of the present invention is mainly aimed at the recovery processing method of blocking DPF cleaning waste liquid, which includes the following steps:
  • Step 1 Perform a primary filtration on the waste liquid generated after the clogged diesel engine is cleaned to filter out particles larger than 50 ⁇ m in the waste liquid.
  • the primary filtration uses a small plate and frame filter press and the filter cloth uses polyester filter cloth.
  • Step 2 Add 3% by mass polyaluminum sulfate solution and 1% by mass non-ionic polyacrylamide solution to the suspension obtained after step one in sequence. After adding the polyaluminum sulfate solution, a large amount of black is produced immediately Alum flower, and then adding non-ionic polyacrylamide solution, immediately form large floccules suspended in the solution, stirring at 400r/min for 10min, and standing for 1h.
  • Step 3 Perform secondary coarse filtration on the flocculation system obtained in Step 2 to filter out the flocculated sediments.
  • the secondary coarse filtration uses XF450 filter, peristaltic pump to transport the flocculation system, filter through 300 mesh filter, DPF cleans the carbon in the waste liquid After the smoke particles are flocculated, they are subjected to electrostatic attraction and chemical bonding to form an agglomerated floc system, but the strength of the flocculation system is not high, and deformation will still occur once the force is applied. Therefore, the flocculation and filtration of the DPF cleaning solution should adopt static pressure filtration.
  • Step 4 The filtrate obtained in Step 3 is subjected to membrane filtration treatment to obtain the recovered cleaning solution.
  • the method for processing diesel engine DPF cleaning waste liquid of the present invention is mainly aimed at the recovery processing method of blocking DPF cleaning waste liquid, which includes the following steps:
  • Step 1 Perform a primary filtration on the waste liquid generated after the clogged diesel engine is cleaned to filter out particles larger than 50 ⁇ m in the waste liquid.
  • the primary filtration uses a small plate and frame filter press and the filter cloth uses polyester filter cloth.
  • Step 2 Add 3% by mass polyaluminum sulfate solution and 1% by mass non-ionic polyacrylamide solution to the suspension obtained after step one in sequence. After adding the polyaluminum sulfate solution, a large amount of black is produced immediately Alum flower, and then adding non-ionic polyacrylamide solution, immediately form large floccules suspended in the solution, stirring at 200r/min for 20min, and standing for 3h.
  • Step 3 Perform secondary coarse filtration on the flocculation system obtained in Step 2 to filter out the flocculated sediments.
  • the secondary coarse filtration uses XF450 filter, peristaltic pump to transport the flocculation system, filter through 300 mesh filter, DPF cleans the carbon in the waste liquid After the smoke particles are flocculated, they are subjected to electrostatic attraction and chemical bonding to form an agglomerated floc system.
  • the strength of the flocculation system is not high, and deformation will still occur once the force is applied. Therefore, the flocculation and filtration of the DPF cleaning solution adopts static pressure filtration.
  • Step 4 The filtrate obtained in Step 3 is subjected to membrane filtration treatment to obtain the recovered cleaning solution.
  • the filtrate obtained from step three of Examples 1, 2, and 3 was filtered using a 721 spectrophotometer, and the absorbance test was performed at a wavelength of 500 nm to verify the treatment effect of the present invention on the DPF cleaning waste liquid. According to the absorbance value, the relative concentration of suspended particulates in the filtrate was compared to verify the treatment effect of the present invention on the DPF cleaning waste liquid.
  • the experimental results are shown in the following table. The absorbance values at the three wavelengths of Example 1 are all low, achieving direct recycling. The standard indicates that the flocculation effect of Example 1 is relatively best.
  • step (2) only the polymer inorganic coagulant aid polyaluminum chloride solution is added; B. In step (2), only the polymer inorganic coagulant aid is added with a mass fraction of 5% for polymerization Aluminum sulfate solution; C. In step (2), only 5% polymer inorganic coagulant aid polyaluminum iron sulfate solution is added; D. In step (2), only 5% polymer organic flocculation is added Agent anionic polyacrylamide solution; E. In step (2), only add the mass fraction of 5% polymer organic flocculant cationic polyacrylamide solution; F. In step (2), only add the mass fraction of 5% Polymer organic flocculant non-ionic polyacrylamide solution; G.
  • step (2) add 4% mass fraction of polymer inorganic coagulant aid polyaluminum chloride solution and 0.1% mass fraction of polymer organic flocculation Reagent non-ionic polyacrylamide solution; the experimental reagents and processing methods of the remaining steps in the above 7 experimental groups are the same as in Example 1.
  • the 721 spectrophotometer was used to test the absorbance of each experimental group at a wavelength of 550nm; and the time required to process 200L diesel engine DPF cleaning waste to form a stable flocculent precipitate.
  • the experimental results are shown in Table 2:
  • the experimental results show that the compound system of experimental group G combines the advantages of polymer inorganic flocculant solution and polymer organic flocculant solution, especially the flocculation speed. It only takes about 10 minutes for 200L diesel engine DPF cleaning waste liquid to form a stable flocculant. It shortens the recycling time of the DPF cleaning waste liquid that blocked the diesel engine.
  • the treated cleaning liquid can reach the wavelength of 550nm and the absorbance is below 0.05, reaching the standard for direct recycling; while the absorbance of the experimental group A to F exceeds 0.05 , And the flocculation time is greatly increased, all are more than half an hour, indicating that a single polymer inorganic coagulant aid solution or a polymer organic flocculant solution can not achieve the effect of a compound system regardless of the specific choice; it cannot be directly recycled. It needs further processing.
  • the 721 spectrophotometer was used to test the absorbance of each experimental group at a wavelength of 550nm; and the time required to process 200L diesel engine DPF cleaning waste to form a stable flocculent precipitate.
  • the experimental results are shown in Table 3:
  • the experimental results show that, as in Group E and Examples 1 to 4, when the mass fraction of the polymer inorganic flocculant solution is 0.1 to 5%, and the mass fraction of the polymer organic flocculant solution is 0.1 to 1%, flocculation The speed is increased and the absorbance is less than 0.05 at a wavelength of 550nm, reaching the standard for direct recycling; Groups A to D show that when the mass fraction of polymer inorganic coagulant solution is added less than 0.1% or greater than 5%, or the mass fraction is less than 0.1% or When the polymer organic flocculant solution is greater than 1%, the flocculation speed becomes slower, and the absorbance far exceeds 0.05, which does not meet the recovery standard.

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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)
  • Separation Of Suspended Particles By Flocculating Agents (AREA)

Abstract

L'invention concerne un procédé de traitement d'un liquide résiduaire de déchets de filtre à particules diesel d'un moteur diesel, un liquide résiduaire obtenu par traitement et une utilisation de celui-ci. Le procédé de traitement comprend les étapes suivantes consistant à : effectuer d'abord un filtrage préliminaire sur un liquide résiduaire produit par nettoyage d'un filtre à particules diesel encrassé d'un moteur diesel afin d'obtenir un filtrat primaire, l'ajout, dans le filtrat primaire, d'un mélange d'une solution polymère inorganique d'aide à la coagulation et d'une solution de floculant polymère, l'agitation et le repos pour obtenir un système de floculation stable ; la filtration grossière du système de floculation en vue de filtrer un précipité de floculation de façon à obtenir un filtrat ; et la filtration sur membrane du filtrat en vue d'obtenir un liquide résiduaire qui satisfait à une norme. L'utilisation d'un système de mélange combine les avantages des deux mélanges, et en particulier, la vitesse de floculation est telle qu'il ne faut qu'environ 10 min pour former une précipitation de floculants stable à partir de 200 l d'un liquide résiduaire de filtre à particules diesel d'un moteur diesel, le temps nécessaire pour recycler un liquide résiduaire d'un filtre à particules diesel encrassé d'un moteur diesel est raccourci, et le liquide résiduaire traité peut atteindre une norme supérieure.
PCT/CN2019/096703 2019-03-04 2019-07-19 Procédé de traitement de liquide résiduaire de déchets de filtre à particules diesel d'un moteur diesel, liquide résiduaire obtenu par traitement et utilisation de celui-ci WO2020177264A1 (fr)

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CN201910159409.0A CN110015776A (zh) 2019-03-04 2019-03-04 柴油机dpf清洗废液的处理方法和处理得到的清洗液及其应用
CN201910159409.0 2019-03-04

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CN110015776A (zh) * 2019-03-04 2019-07-16 江苏可兰素汽车环保科技有限公司 柴油机dpf清洗废液的处理方法和处理得到的清洗液及其应用
CN111533311B (zh) * 2020-05-11 2023-10-13 华辰环保能源(广州)有限责任公司 一种切削液化学结合膜过滤处理及有价金属回收的方法

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WO2008054262A1 (fr) * 2006-10-31 2008-05-08 Volvo Lastvagnar Ab Dispositif destiné au nettoyage d'un filtre à particules diesel
EP2114547A1 (fr) * 2007-01-24 2009-11-11 Ubd Cleantech AB Procédé et système de nettoyage de filtres
US20100213405A1 (en) * 2008-09-26 2010-08-26 David Allen Wensloff Composition and process for removal of contaminants from water and wastewater(s)
CN105271486A (zh) * 2014-06-05 2016-01-27 颜笑天 一种污水污泥零排放污水处理方法
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