CN111185135A - Activated bentonite and process for pretreating landfill leachate by activated bentonite adsorption method - Google Patents

Activated bentonite and process for pretreating landfill leachate by activated bentonite adsorption method Download PDF

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Publication number
CN111185135A
CN111185135A CN202010033931.7A CN202010033931A CN111185135A CN 111185135 A CN111185135 A CN 111185135A CN 202010033931 A CN202010033931 A CN 202010033931A CN 111185135 A CN111185135 A CN 111185135A
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bentonite
landfill leachate
activated bentonite
leachate
activated
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潘玉峰
赵迎朝
代家聚
陈辉
李利平
李嘉隆
何伟峰
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Luoyang Building Materials & Architectural Design And Research Institute Co ltd
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Luoyang Building Materials & Architectural Design And Research Institute Co ltd
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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
    • B01J20/10—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate
    • B01J20/12—Naturally occurring clays or bleaching earth
    • 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
    • B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
    • B01J20/28054—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their surface properties or porosity
    • B01J20/28057—Surface area, e.g. B.E.T specific surface area
    • 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
    • C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
    • 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
    • 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
    • C02F2101/10—Inorganic compounds
    • C02F2101/16—Nitrogen compounds, e.g. ammonia
    • 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
    • C02F2101/10—Inorganic compounds
    • C02F2101/20—Heavy metals or heavy metal compounds
    • 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
    • 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
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/10—Solids, e.g. total solids [TS], total suspended solids [TSS] or volatile solids [VS]
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/14—NH3-N

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Hydrology & Water Resources (AREA)
  • Analytical Chemistry (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Inorganic Chemistry (AREA)
  • Dispersion Chemistry (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Water Treatment By Sorption (AREA)

Abstract

A technology for pretreating landfill leachate by an activated bentonite adsorption method comprises the steps of standing and filtering collected landfill leachate, feeding the filtered landfill leachate into an adjusting tank, and adjusting the pH value to 7-9; and then sending the landfill leachate after the pH value is adjusted to a pretreatment tank, adding activated bentonite into the pretreatment tank according to the proportion that 0.03t of activated bentonite is added into each cubic meter of the landfill leachate, stirring for 10min at the speed of 200-300 r/min, standing for 60min after stirring, draining to obtain effluent of the landfill leachate pretreatment process, and sending the effluent of the landfill leachate pretreatment process to a subsequent treatment process. The process provided by the invention can effectively remove the COD, ammonia nitrogen and SS contents in the leachate, remove more than 65% of the chromaticity of the leachate and more than 80% of heavy metal pollutants, and can also use the pretreated leachate for water quantity and water quality regulation of the stock solution; and the process flow is simple, the operation is stable and reliable, the investment and treatment cost is low, the pressure is reduced for the subsequent treatment of the percolate, the treatment cost is reduced, and the treatment efficiency is improved.

Description

Activated bentonite and process for pretreating landfill leachate by activated bentonite adsorption method
Technical Field
The invention belongs to the technical field of environmental protection, and particularly relates to a process for pretreating domestic garbage leachate by an activated bentonite adsorption method.
Background
At present, the main methods for treating the municipal solid waste comprise composting, landfill, incineration, pyrolysis and the like, and the municipal solid waste in China has the characteristics of high inorganic components, low heat value and the like, so that sanitary landfill is determined to be an important mode for treating the municipal solid waste in China at present. In the process of collecting, transporting and burying the municipal domestic garbage, the pollutants contained in the municipal domestic garbage can generate odorous liquid with high heavy metal content, deep chroma, high pollutant concentration, wide variation range and high ammonia nitrogen content due to the actions of compaction, fermentation, precipitation seepage and the like, and the odorous liquid is called as landfill leachate. Leachate generated after sanitary landfill of garbage can directly or indirectly pollute surface runoff, underground water and soil, so that the treatment of the domestic garbage leachate becomes a great problem in the treatment of urban domestic garbage.
Because the biodegradability of the landfill leachate is low, COD after biochemical treatment can not reach the standard and can not be discharged, although the COD can be ensured to reach the standard by adopting the subsequent treatment procedures such as aeration, ultrafiltration, nitrification, reverse osmosis and the like, the process flow is complex, the problem of recycling of concentrated water is prominent, the biochemical sludge amount is large, and the equipment investment and the treatment cost are relatively high. In view of the above, the present invention provides a process for pretreating landfill leachate by activated bentonite adsorption.
Disclosure of Invention
Aiming at the problems, the invention aims to provide a pretreatment process of landfill leachate, which has stable operation, simple and convenient operation, low investment and low treatment cost, and can reduce the COD (chemical oxygen demand) and ammonia nitrogen content in the landfill leachate so as to reduce the pressure of the subsequent treatment process of the leachate.
The purpose of the invention is realized by adopting the following technical scheme. The activated bentonite provided by the invention is prepared by the following method: adding bentonite into activation modifier according to the proportion of adding 20g of bentonite into each 100ml of solution to obtain mixed solution, wherein the bentonite adopts natural sodium bentonite or modified sodium bentonite, and the activation modifier adopts 5% Al2(SO4)3A solution; and stirring the mixed solution for 1h, soaking and standing for 12h, then carrying out suction filtration and dehydration, drying and roasting for 1h at 450-500 ℃, and sieving by a 10-mesh sieve after grinding to obtain the activated bentonite. The activated bentonite prepared by the invention is introduced with Al3+The ion exchange performance of the bentonite is enhanced, the internal specific surface area is increased, and the adsorption performance of the bentonite is greatly enhanced.
The purpose of the invention is realized by adopting the following technical scheme. According to the technology for pretreating the landfill leachate by the activated bentonite adsorption method, which is provided by the invention, the technology is suitable for pretreating the domestic landfill leachate with the COD content of 800-90000 mg/L and the ammonia nitrogen content of 500-7000 mg/L, SS content of 200-2000 mg/L, pH value of 6-9, and specifically comprises the following steps:
(1) collecting and treating garbage leachate: standing and filtering the collected landfill leachate, and then sending the landfill leachate into an adjusting tank to adjust the pH value to 7-9;
(2) sending the landfill leachate after the pH value is adjusted to a pretreatment tank, adding activated bentonite into the pretreatment tank according to the proportion that 0.03t of activated bentonite is added into each cubic meter of the landfill leachate, stirring for 10min at the speed of 200-300 r/min, standing for 60min after stirring, draining to obtain effluent of a landfill leachate pretreatment process, and sending the effluent of the landfill leachate pretreatment process to a subsequent treatment process.
Bentonite is also called as bentonite or bentonite, is a kind of bentonite with montmorillonite as main component, and has excellent ion exchange, dispersion suspension and adhesion, and owing to the relatively great inner specific surface area, bentonite has excellent adsorption capacity. The pretreatment process of activated bentonite can effectively remove the chromaticity, ammonia nitrogen and COD of the landfill leachate, but the final standard discharge still needs to be removed through the subsequent process reaction.
The process for pretreating landfill leachate by the activated bentonite adsorption method has the following beneficial effects:
1. not only can effectively remove the COD, ammonia nitrogen and SS contents in the leachate, remove more than 65 percent of the chromaticity of the leachate and more than 80 percent of heavy metal pollutants, but also can use the pretreated leachate for regulating the water quantity and the water quality of a stock solution;
2. the process has the advantages of simple flow, stable and reliable operation, low investment and treatment cost, pressure reduction for the subsequent treatment of the percolate, treatment cost reduction and treatment efficiency improvement.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented in accordance with the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more clearly understood, the following preferred embodiments are described in detail with reference to the accompanying drawings.
Drawings
FIG. 1 is a process flow diagram of the activated bentonite adsorption method for pretreating landfill leachate according to the invention.
Detailed Description
The invention is further described with reference to the accompanying drawings and preferred embodiments.
Referring to fig. 1, the process steps for pretreating landfill leachate by activated bentonite adsorption in this embodiment are as follows: 250m of the filtered sample will be collected3Sending the landfill leachate into an adjusting tank, adjusting the pH value to 7-9, then sending the landfill leachate into a pretreatment tank, adding 7.5t of activated bentonite as an adsorbent, stirring at the speed of 200r/min for 10min, standing for 60min after stirring is finished, draining water to obtain effluent of a landfill leachate pretreatment process, and then sending the effluent of the landfill leachate pretreatment process to a subsequent treatment process. The water inflow of the landfill leachate is 250m3The test results of each index in the landfill leachate before and after pretreatment are shown in the following table:
Figure BDA0002365347070000021
from the above table, it can be seen that: the pretreatment process provided by the invention can effectively remove the chromaticity, COD, ammonia nitrogen and SS content of the landfill leachate.
The above description is only a preferred embodiment of the present invention, and any person skilled in the art can make any simple modification, equivalent change and modification to the above embodiments according to the technical essence of the present invention without departing from the scope of the present invention, and still fall within the scope of the present invention.

Claims (3)

1. The activated bentonite is characterized by being prepared by the following method: adding bentonite into activation modifier according to the proportion of adding 20g of bentonite into each 100ml of solution to obtain mixed solution, wherein the bentonite adopts natural sodium bentonite or modified sodium bentonite, and the activation modifier adopts 5% Al2(SO4)3A solution; and stirring the mixed solution for 1h, soaking and standing for 12h, then carrying out suction filtration and dehydration, drying and roasting for 1h at 450-500 ℃, and sieving by a 10-mesh sieve after grinding to obtain the activated bentonite.
2. A process for pretreating landfill leachate by an activated bentonite adsorption method is characterized by comprising the following steps:
(1) standing and filtering the collected landfill leachate, and then sending the landfill leachate into an adjusting tank to adjust the pH value to 7-9;
(2) sending the landfill leachate after the pH value is adjusted to a pretreatment tank, adding activated bentonite into the pretreatment tank according to the proportion that 0.03t of activated bentonite is added into each cubic meter of the landfill leachate, stirring for 10min at the speed of 200-300 r/min, standing for 60min after stirring, draining to obtain effluent of a landfill leachate pretreatment process, and sending the effluent of the landfill leachate pretreatment process to a subsequent treatment process;
the activated bentonite in the step (2) is prepared by the following method: adding bentonite into the activating modifier solution according to the proportion of adding 20g of bentonite into each 100ml of the solution to obtain a mixed solution, wherein the bentonite adopts natural sodium bentonite or modified sodium bentonite, and the activating modifier adopts 5 percent Al2(SO4)3A solution; and stirring the mixed solution for 1h, soaking and standing for 12h, then carrying out suction filtration and dehydration, drying and roasting for 1h at 450-500 ℃, and sieving by a 10-mesh sieve after grinding to obtain the activated bentonite.
3. The process for pretreating landfill leachate by using the activated bentonite adsorption method according to claim 2, wherein the process is suitable for domestic landfill leachate with COD content of 800-90000 mg/L and ammonia nitrogen content of 500-7000 mg/L, SS content of 200-2000 mg/L, pH value of 6-9.
CN202010033931.7A 2020-01-13 2020-01-13 Activated bentonite and process for pretreating landfill leachate by activated bentonite adsorption method Pending CN111185135A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113559683A (en) * 2021-09-06 2021-10-29 安庆市鑫祥瑞环保科技有限公司 Drying agent with heavy metal removal function and preparation method thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113559683A (en) * 2021-09-06 2021-10-29 安庆市鑫祥瑞环保科技有限公司 Drying agent with heavy metal removal function and preparation method thereof
CN113559683B (en) * 2021-09-06 2024-04-09 安庆市鑫祥瑞环保科技有限公司 Drying agent with heavy metal removal function and preparation method thereof

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