CN113754175A - Method for treating grease in landfill leachate - Google Patents

Method for treating grease in landfill leachate Download PDF

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Publication number
CN113754175A
CN113754175A CN202111205127.3A CN202111205127A CN113754175A CN 113754175 A CN113754175 A CN 113754175A CN 202111205127 A CN202111205127 A CN 202111205127A CN 113754175 A CN113754175 A CN 113754175A
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Prior art keywords
grease
heating
activated carbon
treating
filtering
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CN202111205127.3A
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Chinese (zh)
Inventor
罗雅婧
周甜
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Hunan Tianwei Environmental Protection Technology Co ltd
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Hunan Tianwei Environmental Protection Technology Co ltd
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Priority to CN202111205127.3A priority Critical patent/CN113754175A/en
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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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
    • F23G7/001—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals for sludges or waste products from water treatment installations
    • 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
    • C02F1/02—Treatment of water, waste water, or sewage by heating
    • 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
    • C02F1/02—Treatment of water, waste water, or sewage by heating
    • C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
    • 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
    • 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
    • C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/30—Organic compounds
    • C02F2101/32—Hydrocarbons, e.g. oil
    • C02F2101/327—Polyaromatic Hydrocarbons [PAH's]
    • 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
    • C02F2103/06—Contaminated groundwater or leachate
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2301/00—General aspects of water treatment
    • C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/16—Regeneration of sorbents, filters

Abstract

The invention discloses a method for treating grease in garbage percolate, which belongs to the technical field of garbage percolate treatment and comprises the steps of placing garbage percolate collected by a garbage treatment plant in a liquid separating tank, standing, separating grease and waste water, placing the grease in a heating tank for heating, adding active carbon into the heating tank, fully stirring, filtering to obtain primarily treated grease and active carbon adsorbing organic impurities, placing the waste water in an evaporator for concentration, placing the concentrated solution in the heating tank for heating, adding the active carbon into the heating tank, continuously stirring, and filtering. The method solves the problems that the garbage leachate containing benzopyrene cannot be effectively treated to pollute water sources and soil, and the benzopyrene further enters foods such as vegetables, fruits, grains, aquatic products, meat and the like which are dependent on human survival, thereby posing great threat to human health.

Description

Method for treating grease in landfill leachate
Technical Field
The invention belongs to the technical field of landfill leachate treatment, and particularly relates to a treatment method of grease in landfill leachate.
Background
The landfill leachate is high-concentration organic wastewater which is formed by deducting the saturated water content of garbage and a soil covering layer from the water content of the garbage in a garbage landfill, rain, snow and water entering the landfill and other water content, and passing through the garbage layer and the soil covering layer.
At present, a considerable part of landfill sites enter kitchen waste, and bring a large amount of grease, and the grease contains a large amount of harmful substances, such as benzopyrene which is a strong carcinogen, through high temperature. Once the garbage leachate containing benzopyrene is not effectively treated and pollutes water sources and soil, the benzopyrene further enters foods such as vegetables, fruits, grains, aquatic products, meat and the like which are taken by human beings to live, and has great threat to human health.
Chinese invention patent CN111085527A discloses a method for treating waste kitchen grease, which comprises the following steps: s001, screening to remove impurities; pouring the collected waste kitchen grease into a material receiving device, and screening the waste kitchen grease through a screen; the treatment method of the waste kitchen grease provided by the invention overcomes the defects of high manual strength, low treatment efficiency, simple process, environmental sanitation and poor oil quality of the conventional waste kitchen grease treatment. The patent lacks a treatment method about that the oil contains a large amount of harmful substances at high temperature, and fails to solve the problem that the strong carcinogenic substances of benzopyrene in the oil pollute the environment.
Disclosure of Invention
The present invention is directed to a method for treating oil and fat in landfill leachate to address at least one of the problems and disadvantages set forth in the background above.
According to one aspect of the invention, the method for treating the grease in the landfill leachate comprises the following process steps:
s1, placing the garbage leachate collected by the garbage treatment plant into a liquid separation tank, standing, and separating grease and wastewater;
s2, heating the grease in a heating tank, adding activated carbon into the heating tank, fully stirring, and filtering to obtain primarily treated grease and activated carbon for adsorbing organic impurities;
s3, carrying out the step S2 on the once-treated grease for 1-3 times, and collecting and storing the obtained grease;
s4, merging the activated carbon obtained from S2 and S3 into an evaporator, adding an organic solvent, continuously stirring, heating and refluxing for 30-50 minutes, and filtering while the mixture is hot;
s5, repeating the operation of S4 twice on the activated carbon obtained by filtering the S4;
s6, rotatably steaming the filtrate obtained in S4 and S5 to finally obtain organic impurities in the landfill leachate grease, wherein the organic impurities comprise benzopyrene;
s7, putting the wastewater obtained in the step S1 into an evaporator for concentration to obtain a concentrated solution;
s8, heating the concentrated solution in a heating tank, adding activated carbon into the heating tank, continuously stirring and filtering;
s9, placing the activated carbon obtained by filtering the product of S8 in an evaporator, repeating the operation of S4 twice, then carrying out rotary evaporation on the organic solvent, mixing the residue obtained by the rotary evaporation and the organic impurities obtained by the rotary evaporation of S6 to obtain a mixture, and placing the mixture in a combustion furnace to combust and decompose the organic matters into CO2And H2O。
Further, in S1, the heating temperature of the heating tank is 60-120 ℃, and the stirring time is 30-60 minutes.
Further, the organic solvent used in S4 is one or two of acetone, diethyl ether, dichloromethane and ethyl acetate, and is mixed in any proportion.
Further, the heating temperature of the concentrated solution in the S8 is 80-100 ℃, and the heating and stirring time is 10-30 minutes.
Furthermore, the adding amount of the activated carbon in the grease is 3-10% of the mass of the grease.
Furthermore, the adding amount of the active carbon in the wastewater is 3-5% of the mass of the concentrated solution.
Furthermore, the method is also suitable for treating the kitchen waste oil.
Compared with the prior art, the invention has the beneficial effects that:
the method comprises the steps of placing garbage leachate collected by a garbage treatment plant into a liquid separation tank, standing, separating out grease and wastewater, respectively treating the grease and the wastewater, adding activated carbon into the grease and the wastewater, heating and stirring, removing harmful substances such as benzopyrene in the grease of the garbage leachate by using the adsorption capacity of the activated carbon, placing the activated carbon adsorbing the harmful substances such as benzopyrene into an evaporator, adding an organic solvent, continuously stirring, heating and refluxing, filtering while hot, and rotatably steaming the obtained residue by using filtrate.
Harmful substances such as benzopyrene and the like are combusted and decomposed by the combustion furnace, so that the harmful substances such as benzopyrene and the like in the garbage leachate can be effectively removed, the method has stronger applicability and higher efficiency compared with a microbial decomposition method, and solves the problems that the garbage leachate containing benzopyrene cannot be effectively treated to pollute water sources and soil, and the benzopyrene further enters foods such as vegetables, fruits, grains, aquatic products, meat and the like which are dependent on human survival and threaten human health.
Drawings
In order to facilitate understanding for those skilled in the art, the present invention will be further described with reference to the accompanying drawings.
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention are further described in detail below by way of examples with reference to the accompanying drawings. In the specification, the same or similar reference numerals denote the same or similar components. The following description of the embodiments of the present invention with reference to the accompanying drawings is intended to explain the general inventive concept of the present invention and should not be construed as limiting the method of treatment of the grease in landfill leachate of the present invention.
Furthermore, in the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the disclosure. It may be evident, however, that one or more embodiments may be practiced without these specific details. In other instances, well-known structures and devices are shown in schematic form in order to simplify the drawing.
Example 1
As shown in fig. 1, a method for treating grease in landfill leachate is provided, which comprises the following process steps:
s1, placing the garbage leachate collected by the garbage treatment plant into a liquid separation tank, standing, and separating grease and wastewater;
s2, heating the separated grease in a heating tank, adding activated carbon into the heating tank, wherein the adding amount of the activated carbon is 3% of the weight of the grease, continuously stirring for 30 minutes, and filtering to obtain the grease subjected to primary treatment and the activated carbon for adsorbing organic impurities;
s3, carrying out the step S2 on the primarily processed grease twice to obtain secondarily processed grease and activated carbon adsorbing organic impurities, and collecting and storing the grease;
s4, combining the activated carbon obtained from S2 and S3 into an evaporator, adding dichloromethane, continuously stirring, heating and refluxing for 30 minutes, and filtering while the mixture is hot;
s5, repeating the operation of S4 for three times on the activated carbon obtained by filtering the S4;
s6, carrying out vacuum-pumping rotary evaporation on the filtrate obtained in S4 and S5 at normal temperature, removing dichloromethane, and finally obtaining organic impurities in the landfill leachate grease, wherein the organic impurities comprise benzopyrene;
s7, putting the wastewater obtained in the step S1 into an evaporator for concentration to obtain a concentrated solution;
s8, heating the concentrated solution in a heating tank, adding activated carbon into the heating tank, wherein the adding amount of the activated carbon is 3% of the weight of the concentrated solution, continuously stirring for 10 minutes, filtering, and repeating the operation once;
s9, placing the activated carbon obtained by filtering the product in the S8 mode in an evaporator, repeating the operation of the S4 mode twice, then carrying out vacuum-pumping rotary evaporation on the obtained filtrate at normal temperature, mixing the residue obtained by rotary evaporation and organic impurities obtained by rotary evaporation in the S6 mode to obtain a mixture, placing the mixture in a combustion furnace to combust and decompose the organic matters into CO2And H2O。
Example 2
S1, placing the garbage leachate collected by the garbage treatment plant into a liquid separation tank, standing, and separating grease and wastewater;
s2, heating the separated grease in a heating tank, adding active carbon into the heating tank, wherein the adding amount of the active carbon is 5% of the weight of the grease, continuously stirring for 30 minutes, and filtering to obtain the grease subjected to primary treatment and the active carbon for adsorbing organic impurities;
s3, carrying out the step S2 on the primarily processed grease twice to obtain secondarily processed grease and active carbon for adsorbing organic impurities, collecting and storing the grease, and using the collected grease for preparing the biomass diesel oil;
s4, combining the activated carbon obtained from S2 and S3 into an evaporator, adding dichloromethane, continuously stirring, heating and refluxing for 30 minutes, and filtering while the mixture is hot;
s5, repeating the operation of S4 twice on the activated carbon obtained by filtering the S4;
s6, carrying out vacuum-pumping rotary evaporation on the filtrate obtained in S4 and S5 at normal temperature, removing dichloromethane, and finally obtaining organic impurities in the landfill leachate grease, wherein the organic impurities comprise benzopyrene;
s7, putting the wastewater obtained in the step S1 into an evaporator for concentration to obtain a concentrated solution;
s8, heating the concentrated solution in a heating tank, adding active carbon into the heating tank, wherein the adding amount of the active carbon is 5% of the weight of the concentrated solution, continuously stirring for 10 minutes, filtering, and repeating the operation once;
s9, placing the activated carbon obtained by filtering the product in the S8 mode in an evaporator, repeating the operation of the S4 mode twice, then carrying out vacuum-pumping rotary evaporation on the obtained filtrate at normal temperature, mixing the residue obtained by rotary evaporation and organic impurities obtained by rotary evaporation in the S6 mode to obtain a mixture, placing the mixture in a combustion furnace to combust and decompose the organic matters into CO2And H2O。
Example 3
S1, placing the garbage leachate collected by the garbage treatment plant into a liquid separation tank, standing, and separating grease and wastewater;
s2, heating the separated grease in a heating tank, adding activated carbon into the heating tank, wherein the adding amount of the activated carbon is 3% of the weight of the grease, continuously stirring for 30 minutes, and filtering to obtain the grease subjected to primary treatment and the activated carbon for adsorbing organic impurities;
s3, carrying out the step S2 on the primarily processed grease twice to obtain secondarily processed grease and active carbon for adsorbing organic impurities, collecting and storing the grease, and using the collected grease for preparing the biomass diesel oil;
s4, merging the activated carbon obtained from S2 and S3 into an evaporator, adding acetone, continuously stirring, heating and refluxing for 30 minutes, and filtering while the mixture is hot;
s5, repeating the operation of S4 twice on the activated carbon obtained by filtering the S4;
s6, carrying out vacuum-pumping rotary evaporation on the filtrate obtained in S4 and S5 at normal temperature, removing acetone, and finally obtaining organic impurities in the landfill leachate grease, wherein the organic impurities comprise benzopyrene;
s7, putting the wastewater obtained in the step S1 into an evaporator for concentration to obtain a concentrated solution;
s8, heating the concentrated solution in a heating tank, adding activated carbon into the heating tank, wherein the adding amount of the activated carbon is 3% of the weight of the concentrated solution, continuously stirring for 10 minutes, filtering, and repeating the operation once;
s9, placing the activated carbon obtained by filtering the product in the S8 mode in an evaporator, repeating the operation of the S4 mode twice, then carrying out vacuum-pumping rotary evaporation on the obtained filtrate at normal temperature, mixing the residue obtained by rotary evaporation and organic impurities obtained by rotary evaporation in the S6 mode to obtain a mixture, placing the mixture in a combustion furnace to combust and decompose the organic matters into CO2And H2O。
TABLE 1 detection results of harmful substances in the landfill leachate of the present invention
Figure BDA0003306593940000061
TABLE 1
Table 2 shows the results of detecting harmful substances in fats and oils and wastewater in example 1 of the present invention
Figure BDA0003306593940000062
Figure BDA0003306593940000071
TABLE 2
Table 3 shows the results of detecting harmful substances in fats and oils and wastewater in example 2 of the present invention
Figure BDA0003306593940000072
TABLE 3
Table 4 shows the results of detecting harmful substances in fats and oils and wastewater in example 3 of the present invention
Figure BDA0003306593940000073
Figure BDA0003306593940000081
TABLE 4
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (7)

1. A method for treating grease in landfill leachate is characterized by comprising the following process steps:
s1, placing the garbage leachate collected by the garbage treatment plant into a liquid separation tank, standing, and separating grease and wastewater;
s2, heating the grease in a heating tank, adding activated carbon into the heating tank, fully stirring, and filtering to obtain primarily treated grease and activated carbon for adsorbing organic impurities;
s3, carrying out the step S2 on the once-treated grease for 1-3 times, and collecting and storing the obtained grease;
s4, merging the activated carbon obtained from S2 and S3 into an evaporator, adding an organic solvent, continuously stirring, heating and refluxing for 30-50 minutes, and filtering while the mixture is hot;
s5, repeating the operation of S4 twice on the activated carbon obtained by filtering the S4;
s6, rotatably steaming the filtrate obtained in S4 and S5 to finally obtain organic impurities in the landfill leachate grease, wherein the organic impurities comprise benzopyrene;
s7, putting the wastewater obtained in the step S1 into an evaporator for concentration to obtain a concentrated solution;
s8, heating the concentrated solution in a heating tank, adding activated carbon into the heating tank, continuously stirring and filtering;
s9, placing the activated carbon obtained by filtering the product of S8 in an evaporator, repeating the operation of S4 twice, then carrying out rotary evaporation on the organic solvent, mixing the residue obtained by the rotary evaporation and the organic impurities obtained by the rotary evaporation of S6 to obtain a mixture, placing the mixture in a combustion furnace to be combusted into CO2And H2O。
2. The method for treating the grease in the landfill leachate according to claim 1, wherein the heating temperature of the heating tank in S1 is 60-120 ℃, and the stirring time is 30-60 minutes.
3. The method for treating the grease in the landfill leachate according to claim 1, wherein the organic solvent used in S4 is one or two of acetone, diethyl ether, dichloromethane and ethyl acetate, and is mixed in any proportion.
4. The method for treating the grease in the landfill leachate according to claim 1, wherein the heating temperature of the concentrated solution in the S8 is 80-100 ℃, and the heating and stirring time is 10-30 minutes.
5. The method for treating the oil in the landfill leachate according to claim 1, wherein the addition amount of the activated carbon in the oil is 3-10% of the mass of the oil.
6. The method for treating the grease in the landfill leachate according to claim 1, wherein the adding amount of the activated carbon in the wastewater is 3-5% of the mass of the concentrated solution.
7. The method for treating grease in landfill leachate according to claim 6, wherein the method is further suitable for treating kitchen waste oil.
CN202111205127.3A 2021-10-15 2021-10-15 Method for treating grease in landfill leachate Pending CN113754175A (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108372180A (en) * 2018-02-05 2018-08-07 宜兴市欧亚华都环境工程有限公司 A kind of processing method of changing food waste into resources
CN110862770A (en) * 2019-11-20 2020-03-06 贵州红星山海生物科技有限责任公司 Method for removing benzopyrene in capsicum oleoresin with low loss
CN111977878A (en) * 2020-08-11 2020-11-24 北京高能时代环境技术股份有限公司 Kitchen garbage leachate grease extraction system
CN112110565A (en) * 2020-08-26 2020-12-22 武汉雅洁净环境工程有限公司 Processing method for recycling kitchen garbage

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108372180A (en) * 2018-02-05 2018-08-07 宜兴市欧亚华都环境工程有限公司 A kind of processing method of changing food waste into resources
CN110862770A (en) * 2019-11-20 2020-03-06 贵州红星山海生物科技有限责任公司 Method for removing benzopyrene in capsicum oleoresin with low loss
CN111977878A (en) * 2020-08-11 2020-11-24 北京高能时代环境技术股份有限公司 Kitchen garbage leachate grease extraction system
CN112110565A (en) * 2020-08-26 2020-12-22 武汉雅洁净环境工程有限公司 Processing method for recycling kitchen garbage

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Application publication date: 20211207