CN113697980A - Flotation separation and recovery system and method for carbon-based adsorbent in polluted water environment - Google Patents
Flotation separation and recovery system and method for carbon-based adsorbent in polluted water environment Download PDFInfo
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- CN113697980A CN113697980A CN202111030216.9A CN202111030216A CN113697980A CN 113697980 A CN113697980 A CN 113697980A CN 202111030216 A CN202111030216 A CN 202111030216A CN 113697980 A CN113697980 A CN 113697980A
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- 239000003463 adsorbent Substances 0.000 title claims abstract description 118
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 112
- 238000005188 flotation Methods 0.000 title claims abstract description 110
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 101
- 238000000926 separation method Methods 0.000 title claims abstract description 98
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000011084 recovery Methods 0.000 title claims abstract description 33
- 239000002562 thickening agent Substances 0.000 claims abstract description 46
- 238000001179 sorption measurement Methods 0.000 claims abstract description 43
- 239000002002 slurry Substances 0.000 claims abstract description 39
- 239000012141 concentrate Substances 0.000 claims abstract description 27
- 230000003068 static effect Effects 0.000 claims abstract description 26
- 230000018044 dehydration Effects 0.000 claims abstract description 24
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 24
- 239000006260 foam Substances 0.000 claims abstract description 21
- 238000003825 pressing Methods 0.000 claims abstract description 16
- 238000004064 recycling Methods 0.000 claims abstract description 8
- 230000008929 regeneration Effects 0.000 claims abstract description 7
- 238000011069 regeneration method Methods 0.000 claims abstract description 7
- 230000003647 oxidation Effects 0.000 claims abstract description 4
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 4
- 239000010865 sewage Substances 0.000 claims abstract description 4
- 239000012065 filter cake Substances 0.000 claims description 21
- 208000005156 Dehydration Diseases 0.000 claims description 20
- 239000007788 liquid Substances 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 10
- 239000003344 environmental pollutant Substances 0.000 claims description 9
- 231100000719 pollutant Toxicity 0.000 claims description 9
- 238000009291 froth flotation Methods 0.000 claims description 7
- 239000000047 product Substances 0.000 claims description 7
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 239000004088 foaming agent Substances 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 5
- WVYWICLMDOOCFB-UHFFFAOYSA-N 4-methyl-2-pentanol Chemical group CC(C)CC(C)O WVYWICLMDOOCFB-UHFFFAOYSA-N 0.000 claims description 4
- 239000003245 coal Substances 0.000 claims description 4
- 239000003350 kerosene Substances 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- 238000006056 electrooxidation reaction Methods 0.000 claims description 3
- 238000000197 pyrolysis Methods 0.000 claims description 3
- 230000001172 regenerating effect Effects 0.000 claims description 3
- 239000003575 carbonaceous material Substances 0.000 claims description 2
- 238000005265 energy consumption Methods 0.000 abstract description 6
- 239000000571 coke Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000003911 water pollution Methods 0.000 description 3
- 238000003889 chemical engineering Methods 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 238000004939 coking Methods 0.000 description 2
- 238000005272 metallurgy Methods 0.000 description 2
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical class C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000011895 specific detection Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
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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
- C02F1/24—Treatment of water, waste water, or sewage by flotation
-
- 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
- C02F1/40—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
- C02F2303/00—Specific treatment goals
- C02F2303/16—Regeneration of sorbents, filters
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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)
Abstract
The invention discloses a system and a method for flotation, separation and recovery of a carbon-based adsorbent in a polluted water environment, which are suitable for the field of treatment and recovery of polluted water. Feeding the carbon-based adsorbent into a static adsorption device filled with polluted water for adsorption treatment, separating the treated sewage from the used carbon-based adsorbent slurry through a concentration and dehydration device after the adsorption is finished, and performing foam flotation separation on the separated carbon-based adsorbent slurry. The discharge of the concentrate outlet of the flotation separation device is directly subjected to filter pressing dehydration to recover the carbon-based adsorbent, the discharge of the tailing outlet of the flotation separation device is subjected to concentration dehydration and then to filter pressing dehydration recovery, and the recovered carbon-based adsorbent is subjected to crushing oxidation regeneration treatment, so that the reuse can be realized. The invention greatly reduces the workload of equipment such as a thickener, a filter press and the like, improves the recycling efficiency of the carbon-based adsorbent, reduces the energy consumption and has good market application prospect.
Description
Technical Field
The invention relates to a flotation separation and recovery system and a flotation separation and recovery method, in particular to a flotation separation and recovery system and a flotation separation and recovery method of a carbon-based adsorbent in a polluted water environment, which are suitable for treatment and recovery of polluted water.
Background
With the increasing severity of water pollution, adsorption methods using porous solid adsorbents to adsorb one or more components in a water sample on the surface are widely used for treating water pollution. The carbon-based adsorbent has the advantages of low cost, simple operation and no secondary pollution, and occupies a considerable proportion in the water pollution problem treatment by the adsorption method. Under the condition of the huge application range of the carbon-based adsorbent, how to efficiently realize solid-liquid separation and recycle the carbon-based adsorbent becomes an urgent problem to be solved. The existing adsorption implementation forms can be dynamic adsorption and static adsorption, the dynamic adsorption process which is widely applied at present has the limitations of insufficient contact, time consumption and labor consumption in the process of replacing the adsorbent, the static adsorption process has the advantages of full utilization of the adsorbent, high adsorption efficiency and the like, but the recovery mode of the adsorbent generally adopts concentration and filter pressing equipment to carry out direct dehydration treatment so as to realize solid-liquid separation and recover the carbon-based adsorbent, the separation efficiency is low, the energy consumption is high, and the general application of the process is seriously hindered. Therefore, a high-efficiency, low-cost and low-energy-consumption carbon-based adsorbent separation and recovery process is needed.
Disclosure of Invention
Aiming at the technical problems, the invention provides a system and a method for flotation separation and recovery of a carbon-based adsorbent in a polluted water environment, which are used for solving the problems of low separation and recovery efficiency and high energy consumption of the existing carbon-based adsorbent.
In order to achieve the technical purpose, the flotation separation and recovery system of the carbon-based adsorbent under the polluted water environment comprises a static adsorption device, a flotation separation device, a thickener I and an adsorbent recovery system;
the output end of the static adsorption device is connected with an inlet of a thickener I, a water outlet of the thickener I discharges separated water, a discharge hole of the thickener I is connected with a flotation separation device, a concentrate ore pulp outlet of the flotation separation device is connected with a feed hole of a filter press I, a tailing ore pulp outlet is connected with a feed hole of a thickener II, a discharge hole of the thickener is connected with a feed hole of the filter press II, and discharge holes of the filter press I and the filter press II are both connected with a feed hole of a crusher;
the adsorbent recovery system comprises a flotation machine, a thickener II, a filter press I, a filter press II and a crusher, wherein a concentrate discharge port of the flotation machine is connected with an inlet of the filter press I through a pipeline, a tailing outlet of the flotation machine is connected with an inlet of the thickener II, an outlet of the thickener II is connected with an inlet of the filter press II, and outlets of the filter press I and the filter press II are connected with the crusher.
The static adsorption device is an adsorption tank or a stirring adsorption bucket; the concentration and dehydration device is a conventional thickener, and the flotation separation device is a conventional flotation machine or a flotation column.
A recovery method of a carbon-based adsorbent flotation separation recovery system comprises the following steps:
the method comprises the steps of feeding polluted water mixed with a carbon-based adsorbent into a static adsorption device, adsorbing pollutants in the polluted water by the carbon-based adsorbent, separating treated sewage from used carbon-based adsorbent slurry only through a concentration and dehydration device, feeding the separated carbon-based adsorbent slurry into a flotation separation device for foam flotation separation, directly feeding discharged materials in a concentrate outlet of the flotation separation device for filter-pressing dehydration to obtain recovered carbon-based adsorbent filter cakes, concentrating and dehydrating the discharged materials at a tailing outlet of the flotation separation device, then performing filter-pressing dehydration to recover the carbon-based adsorbent filter cakes, crushing the recovered carbon-based adsorbent filter cakes, and then performing conventional oxidation regeneration treatment to realize reuse.
The method comprises the following specific steps:
step 1: performing static adsorption by using a carbon-based adsorbent; feeding the carbon-based adsorbent and the water to be treated into a static adsorption device to adsorb pollutant components in the water body to be treated;
step 2: feeding the slurry fully adsorbing the water to be treated by using the carbon-based adsorbent into a thickener I for solid-liquid separation, judging the separated liquid according to the detected pollution treatment degree to continue reduction or recycle the liquid as reduced water, feeding the underflow slurry after treatment into a flotation separation device for foam flotation separation,
and step 3: performing froth flotation separation; feeding the underflow slurry of the thickener I into a flotation separation device, adding a collecting agent and a foaming agent into the flotation separation device for foam flotation separation, separating concentrate slurry from a concentrate outlet by the flotation separation device through foam flotation separation, and separating tailing slurry from a tailing outlet by the flotation separation device;
and 4, step 4: concentrating and filter pressing slurry: feeding the concentrate slurry separated by the flotation separation device into a filter press I for dehydration treatment to obtain a recovered carbon-based adsorbent filter cake; concentrating the tailing pulp separated by the flotation separation device by a thickener II and performing filter pressing and dehydration treatment by a filter press II to obtain a recycled carbon-based adsorbent filter cake, and judging whether to perform subsequent treatment according to the concentration of pollutants in water generated in the process;
and 5: crushing, recovering and regenerating the carbon-based adsorbent: feeding the dehydrated filter cake of the recovered carbon-based adsorbent into a crusher for crushing, and treating the crushed filter cake of the recovered carbon-based adsorbent by using electrochemical oxidation and high-temperature pyrolysis to realize regeneration treatment, thereby realizing reuse.
The carbon-based adsorbent is a porous carbonaceous substance adsorbent or coal adsorbent with a high specific surface area, and the fixed carbon content is more than 50% and the particle size is less than 0.5 mm.
The concentration of the thickener I is increased to meet the feeding requirement of the flotation machine, the dosage of the carbon-based adsorbent is 6.2 g/L-7.6 g, and the concentration of the feeding material for the foam flotation is 80 g/L-120 g/L.
The collecting agent is kerosene, and the foaming agent is methyl isobutyl carbinol.
Performing froth flotation in a flotation separation device, wherein a froth product of the flotation separation device is a concentrate slurry containing a large proportion of carbon-based adsorbents; the non-foam product of the flotation separation device is tailing slurry, wherein the proportion of the carbon-based adsorbent is small.
The beneficial effects are that:
the invention adopts a static adsorption device, and a quantitative adsorbent is fully contacted with a quantitative solution to reach balance. The static adsorption generating device can increase the contact between the adsorbent and a water sample, and the adsorption performance of the adsorbent is fully utilized; compare in dynamic adsorption, reduce the input of adsorbent to a certain extent, more effectively avoid the dangerous operation that dynamic adsorption tower changes the adsorbent and wastes time, difficultly.
According to the invention, the concentrator I is arranged between the static adsorption device and the flotation separation device, so that the product concentration of the static adsorption generation device can be regulated and controlled, the requirement of the feed concentration of the separation generation device is met, and the production efficiency difference of the two devices is coordinated, so that the functions of transferring, buffering and adjusting are achieved. Due to the existence of the thickener, the separation generating device can continuously, uniformly and smoothly feed materials, and the whole process can be orderly and stably carried out.
The invention successfully introduces mature foam flotation technology for separating and recovering the carbon-based adsorbent based on the excellent floatability of the carbon-based adsorbent. The technology can adjust the use category and the use amount of the flotation reagent according to the surface property of the carbon-based adsorbent, only adds a trace amount of the flotation reagent, can realize the enrichment of the carbon-based adsorbent, has low cost, greatly reduces the burden of subsequent dewatering equipment such as a thickener, a filter press and the like, reduces the energy consumption of the separation and recovery process of the carbon-based adsorbent, and improves the process efficiency.
In the invention, the technical schemes can be combined with each other to realize more preferable combination schemes. The invention provides a flotation separation and recovery process of a carbon-based adsorbent in a water environment, which successfully introduces a mature froth flotation technology, and greatly concentrates and enriches the carbon-based adsorbent by utilizing the excellent floatability of the carbon-based adsorbent. The carbon-based adsorbent is concentrated in the concentrate pulp, and the content of the carbon-based adsorbent in the tailing pulp is low, so that the workload of equipment such as a thickener, a filter press and the like is reduced to a great extent, the recycling efficiency of the carbon-based adsorbent is improved, and the energy consumption is reduced.
Drawings
Fig. 1 is a schematic diagram of a flotation separation and recovery process of a carbon-based adsorbent in an aqueous environment.
Detailed Description
The embodiments of the present invention will be further explained with reference to the accompanying drawings:
as shown in fig. 1, the system for flotation, separation and recovery of a carbon-based adsorbent in a polluted water environment comprises a static adsorption device, a flotation separation device, a thickener i and an adsorbent recovery system; the static adsorption device is an adsorption tank or a stirring adsorption bucket; the concentration and dehydration device is a conventional thickener, and the flotation separation device is a conventional flotation machine or a flotation column.
The output end of the static adsorption device is connected with an inlet of a thickener I, a water outlet of the thickener I discharges separated water, a discharge hole of the thickener I is connected with a flotation separation device, a concentrate ore pulp outlet of the flotation separation device is connected with a feed hole of a filter press I, a tailing ore pulp outlet is connected with a feed hole of a thickener II, a discharge hole of the thickener is connected with a feed hole of the filter press II, and discharge holes of the filter press I and the filter press II are both connected with a feed hole of a crusher;
the adsorbent recovery system comprises a flotation machine, a thickener II, a filter press I, a filter press II and a crusher, wherein a concentrate discharge port of the flotation machine is connected with an inlet of the filter press I through a pipeline, a tailing outlet of the flotation machine is connected with an inlet of the thickener II, an outlet of the thickener II is connected with an inlet of the filter press II, and outlets of the filter press I and the filter press II are connected with the crusher.
A recovery method of a carbon-based adsorbent flotation separation recovery system in a polluted water environment comprises the following steps:
the method comprises the steps of feeding polluted water mixed with a carbon-based adsorbent into a static adsorption device, adsorbing pollutants in the polluted water by the carbon-based adsorbent, separating treated sewage from used carbon-based adsorbent slurry only through a concentration and dehydration device, feeding the separated carbon-based adsorbent slurry into a flotation separation device for foam flotation separation, directly feeding discharged materials in a concentrate outlet of the flotation separation device for filter-pressing dehydration to obtain recovered carbon-based adsorbent filter cakes, concentrating and dehydrating the discharged materials at a tailing outlet of the flotation separation device, then performing filter-pressing dehydration to recover the carbon-based adsorbent filter cakes, crushing the recovered carbon-based adsorbent filter cakes, and then performing conventional oxidation regeneration treatment to realize reuse.
The method comprises the following specific steps:
step 1: performing static adsorption by using a carbon-based adsorbent; feeding the carbon-based adsorbent and the water to be treated into a static adsorption device to adsorb pollutant components in the water body to be treated;
step 2: feeding the slurry which fully adsorbs the water to be treated by using the carbon-based adsorbent into a thickener I for solid-liquid separation, judging the separated liquid according to the detection pollution treatment degree to continue reduction or recycle as reduced water, feeding the underflow slurry after treatment into a flotation separation device for foam flotation separation, and increasing the concentration of the thickener I until the feeding requirement of the flotation machine is met, wherein the consumption of the carbon-based adsorbent is 6.2-7.6 g, and the concentration of the feeding material for foam flotation is 80-120 g/L;
and step 3: performing froth flotation separation; feeding the underflow slurry of the thickener I into a flotation separation device, adding a collecting agent and a foaming agent into the flotation separation device for foam flotation separation, separating concentrate slurry from a concentrate outlet by the flotation separation device through foam flotation separation, and separating tailing slurry from a tailing outlet by the flotation separation device; the collecting agent is kerosene, and the foaming agent is methyl isobutyl carbinol;
and 4, step 4: concentrating and filter pressing slurry: feeding the concentrate slurry separated by the flotation separation device into a filter press I for dehydration treatment to obtain a recovered carbon-based adsorbent filter cake; concentrating the tailing pulp separated by the flotation separation device by a thickener II and performing filter pressing and dehydration treatment by a filter press II to obtain a recycled carbon-based adsorbent filter cake, and judging whether to perform subsequent treatment according to the concentration of pollutants in water generated in the process;
and 5: crushing, recovering and regenerating the carbon-based adsorbent: feeding the dehydrated filter cake of the recovered carbon-based adsorbent into a crusher for crushing, and treating the crushed filter cake of the recovered carbon-based adsorbent by using electrochemical oxidation and high-temperature pyrolysis to realize regeneration treatment, thereby realizing reuse. Performing froth flotation in a flotation separation device, wherein a froth product of the flotation separation device is a concentrate slurry, and the carbon-based adsorbent contained in the concentrate slurry has a large proportion; the non-foam product of the flotation separation device is tailing slurry, wherein the proportion of the carbon-based adsorbent is small.
The carbon-based adsorbent is a porous carbonaceous adsorbent or coal adsorbent with a high specific surface area, the fixed carbon content is more than 50% and the granularity is less than 0.5mm, and the carbon-based adsorbent comprises: the porous carbon-containing substances with high specific surface area, such as active carbon, modified coke powder, modified anthracite and the like, which are made of coal or organic matters, can be suitable for the existing carbonaceous adsorbents meeting the requirement of granularity.
Specifically, coke powder is selected as a carbon-based adsorbent (the coke powder refers to coke with the particle size of less than 5mm generated in the coke production process of enterprises such as metallurgy and chemical engineering and the like), and secondary precipitated water (COD: 355mg/L) of a certain coking plant is taken as a water sample to be treated by the process.
Specifically, coke powder is selected as a carbon-based adsorbent (the coke powder refers to coke with the particle size of less than 5mm generated in the coke production process of enterprises such as metallurgy and chemical engineering and the like), and secondary precipitated water (COD: 355mg/L) of a certain coking plant is taken as a water sample to be treated by the process. Crushing and screening the coke powder to control the granularity of the coke powder to be less than 0.5mm, wherein the ash content of the used coke powder is 16.4 percent, and the specific detection components are shown in Table 1.
TABLE 1 Coke breeze ash composition
When the method is implemented, firstly, feeding the coke powder and secondary precipitation water into a static adsorption device, wherein the slurry concentration is 120g/L, stirring and adsorbing are carried out for 30min, and the stirring intensity is 500 r/min; then introducing into a flotation separation device, sequentially adding a collecting agent-kerosene and a foaming agent-methyl isobutyl carbinol (MIBC), and assisting in foam flotation; respectively obtaining concentrate ore pulp with slurry concentration of about 75% and tailing ore pulp with slurry concentration of 25%, and performing filter pressing, dehydration, drying and weighing in a filter press. The COD removal rate is higher than 90%, the recovery rate of the coke powder in the ore concentrate pulp reaches 93%, and the 100% recovery of the coke powder is realized in the whole process.
Claims (8)
1. A system for separating and recovering a carbon-based adsorbent in a polluted water environment by flotation is characterized in that: the device comprises a static adsorption device, a flotation separation device, a thickener I and an adsorbent recovery system;
the output end of the static adsorption device is connected with an inlet of a thickener I, a water outlet of the thickener I discharges separated water, a discharge hole of the thickener I is connected with a flotation separation device, a concentrate ore pulp outlet of the flotation separation device is connected with a feed hole of a filter press I, a tailing ore pulp outlet is connected with a feed hole of a thickener II, a discharge hole of the thickener is connected with a feed hole of the filter press II, and discharge holes of the filter press I and the filter press II are both connected with a feed hole of a crusher;
the adsorbent recovery system comprises a flotation machine, a thickener II, a filter press I, a filter press II and a crusher, wherein a concentrate discharge port of the flotation machine is connected with an inlet of the filter press I through a pipeline, a tailing outlet of the flotation machine is connected with an inlet of the thickener II, an outlet of the thickener II is connected with an inlet of the filter press II, and outlets of the filter press I and the filter press II are connected with the crusher.
2. The system for flotation separation and recovery of carbon-based adsorbents in a polluted water environment according to claim 1, wherein: the static adsorption device is an adsorption tank or a stirring adsorption bucket; the concentration and dehydration device is a conventional thickener, and the flotation separation device is a conventional flotation machine or a flotation column.
3. A recycling method using the system for flotation separation and recycling of carbon-based adsorbents in polluted water environment according to claim 1, which is characterized by comprising the following steps:
the method comprises the steps of feeding polluted water mixed with a carbon-based adsorbent into a static adsorption device, adsorbing pollutants in the polluted water by the carbon-based adsorbent, separating treated sewage from used carbon-based adsorbent slurry only through a concentration and dehydration device, feeding the separated carbon-based adsorbent slurry into a flotation separation device for foam flotation separation, directly feeding discharged materials in a concentrate outlet of the flotation separation device for filter-pressing dehydration to obtain recovered carbon-based adsorbent filter cakes, concentrating and dehydrating the discharged materials at a tailing outlet of the flotation separation device, then performing filter-pressing dehydration to recover the carbon-based adsorbent filter cakes, crushing the recovered carbon-based adsorbent filter cakes, and then performing conventional oxidation regeneration treatment to realize reuse.
4. A recycling method according to claim 3, characterized in that: the carbon-based adsorbent is a porous carbonaceous substance adsorbent or coal adsorbent with a high specific surface area, and the fixed carbon content is more than 50% and the particle size is less than 0.5 mm.
5. The recovery method according to claim 3, characterized by the following specific steps:
step 1: performing static adsorption by using a carbon-based adsorbent; feeding the carbon-based adsorbent and the water to be treated into a static adsorption device to adsorb pollutant components in the water body to be treated;
step 2: feeding the slurry fully adsorbing the water to be treated by using the carbon-based adsorbent into a thickener I for solid-liquid separation, judging the separated liquid according to the detected pollution treatment degree to continue reduction or recycle the liquid as reduced water, feeding the underflow slurry after treatment into a flotation separation device for foam flotation separation,
and step 3: performing froth flotation separation; feeding the underflow slurry of the thickener I into a flotation separation device, adding a collecting agent and a foaming agent into the flotation separation device for foam flotation separation, separating concentrate slurry from a concentrate outlet by the flotation separation device through foam flotation separation, and separating tailing slurry from a tailing outlet by the flotation separation device;
and 4, step 4: concentrating and filter pressing slurry: feeding the concentrate slurry separated by the flotation separation device into a filter press I for dehydration treatment to obtain a recovered carbon-based adsorbent filter cake; concentrating the tailing pulp separated by the flotation separation device by a thickener II and performing filter pressing and dehydration treatment by a filter press II to obtain a recycled carbon-based adsorbent filter cake, and judging whether to perform subsequent treatment according to the concentration of pollutants in water generated in the process;
and 5: crushing, recovering and regenerating the carbon-based adsorbent: feeding the dehydrated filter cake of the recovered carbon-based adsorbent into a crusher for crushing, and treating the crushed filter cake of the recovered carbon-based adsorbent by using electrochemical oxidation and high-temperature pyrolysis to realize regeneration treatment, thereby realizing reuse.
6. The recycling method according to claim 5, characterized in that: the concentration of the thickener I is increased to meet the feeding requirement of the flotation machine, the dosage of the carbon-based adsorbent is 6.2 g/L-7.6 g, and the concentration of the feeding material for the foam flotation is 80 g/L-120 g/L.
7. The recycling method according to claim 5, characterized in that: the collecting agent is kerosene, and the foaming agent is methyl isobutyl carbinol.
8. The recycling method according to claim 5, characterized in that: performing froth flotation in a flotation separation device, wherein a froth product of the flotation separation device is a concentrate slurry containing a large proportion of carbon-based adsorbents; the non-foam product of the flotation separation device is tailing slurry, wherein the proportion of the carbon-based adsorbent is small.
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| CN114956244A (en) * | 2022-03-24 | 2022-08-30 | 中国矿业大学 | Coal gasification slag carbon ash separation and coal chemical industry wastewater combined treatment method |
Citations (6)
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