CN112062339A - Sludge retreatment type coal washing wastewater treatment method - Google Patents
Sludge retreatment type coal washing wastewater treatment method Download PDFInfo
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- CN112062339A CN112062339A CN202010935121.0A CN202010935121A CN112062339A CN 112062339 A CN112062339 A CN 112062339A CN 202010935121 A CN202010935121 A CN 202010935121A CN 112062339 A CN112062339 A CN 112062339A
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- 239000003245 coal Substances 0.000 title claims abstract description 57
- 238000005406 washing Methods 0.000 title claims abstract description 25
- 238000004065 wastewater treatment Methods 0.000 title claims abstract description 12
- 239000010802 sludge Substances 0.000 title claims abstract description 10
- 238000011268 retreatment Methods 0.000 title claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 49
- 238000004659 sterilization and disinfection Methods 0.000 claims abstract description 21
- 238000000926 separation method Methods 0.000 claims abstract description 17
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000002244 precipitate Substances 0.000 claims abstract description 14
- 239000002351 wastewater Substances 0.000 claims abstract description 14
- 238000001223 reverse osmosis Methods 0.000 claims abstract description 13
- 239000012528 membrane Substances 0.000 claims abstract description 12
- 238000005189 flocculation Methods 0.000 claims abstract description 11
- 230000016615 flocculation Effects 0.000 claims abstract description 11
- 238000004062 sedimentation Methods 0.000 claims abstract description 11
- 238000009284 supercritical water oxidation Methods 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract description 9
- 239000006228 supernatant Substances 0.000 claims abstract description 8
- 238000001914 filtration Methods 0.000 claims abstract description 7
- 238000000108 ultra-filtration Methods 0.000 claims abstract description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 10
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 5
- 239000008394 flocculating agent Substances 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 4
- 239000001569 carbon dioxide Substances 0.000 claims description 3
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 claims description 3
- 229920002401 polyacrylamide Polymers 0.000 claims description 3
- 238000012958 reprocessing Methods 0.000 claims description 2
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- 239000003344 environmental pollutant Substances 0.000 abstract description 4
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- KZBUYRJDOAKODT-UHFFFAOYSA-N Chlorine Chemical compound ClCl KZBUYRJDOAKODT-UHFFFAOYSA-N 0.000 description 2
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- 241000894006 Bacteria Species 0.000 description 1
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 description 1
- 241000223935 Cryptosporidium Species 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
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- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 1
- 239000003830 anthracite Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- FOCAUTSVDIKZOP-UHFFFAOYSA-N chloroacetic acid Chemical compound OC(=O)CCl FOCAUTSVDIKZOP-UHFFFAOYSA-N 0.000 description 1
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- 239000010815 organic waste Substances 0.000 description 1
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- 238000002203 pretreatment Methods 0.000 description 1
- 102000004169 proteins and genes Human genes 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
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Images
Classifications
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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
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/30—Active carbon
- C01B32/312—Preparation
- C01B32/318—Preparation characterised by the starting materials
- C01B32/324—Preparation characterised by the starting materials from waste materials, e.g. tyres or spent sulfite pulp liquor
-
- 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
- C02F1/34—Treatment of water, waste water, or sewage with mechanical oscillations
- C02F1/36—Treatment of water, waste water, or sewage with mechanical oscillations ultrasonic vibrations
-
- 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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by 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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
-
- 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
-
- 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
- C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
-
- 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
- C02F2303/04—Disinfection
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/54—Improvements relating to the production of bulk chemicals using solvents, e.g. supercritical solvents or ionic liquids
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Materials Engineering (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Water Supply & Treatment (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention relates to the technical field of wastewater treatment, in particular to a sludge retreatment type coal washing wastewater treatment method. The method comprises the following steps: a) feeding the coal washing wastewater into an oil separation tank for oil separation treatment; b) separating the precipitate and the supernatant in a flocculation sedimentation tank by using the water subjected to the oil removal treatment; c) supernatant separated from the flocculation sedimentation tank enters a disinfection tank for ultrasonic disinfection, and separated precipitates are sent into a supercritical water oxidation system for treatment; d) water is sent into a multi-medium filter for multi-medium filtration; e) feeding water into an ultrafilter for ultrafiltration; f) the water is subjected to reverse osmosis through a reverse osmosis membrane. The invention adopts ultrasonic wave disinfection to avoid the generation of harmful byproducts and the irreversible influence on human bodies and environment. The coal slime and the coal slag are treated by supercritical water oxidation, so that pollutants in the coal slime and the coal slag are completely removed, and further reprocessed products such as activated carbon and the like are prepared for utilizing resources.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a sludge retreatment type coal washing wastewater treatment method.
Background
The coal washing wastewater is a multi-item system formed by mixing primary coal slime, secondary coal slime and water. The coal washing wastewater contains coal slime particles (coarse coal slime particles are 0.5-1 mm, fine coal slime particles are 0-0.5 mm), minerals, clay particles and the like. The coal washing wastewater generally has the characteristics of high SS, CODcr and BOD5 concentrations, so the coal slime water not only has the property of suspension, but also often has the property of colloid; the granularity of fine coal slime particles, clay particles and the like is very small, the fine coal slime particles, the clay particles and the like are not easy to settle, and the properties determine that the wastewater is seriously polluted and has high treatment difficulty. The original process generally adopts a disinfection mode of chlorine injection disinfection, but chlorine gas is toxic, and safety must be paid attention to during use to prevent leakage. And the water is often disinfected by chlorine to produce various harmful substances, especially disinfection byproducts with the 'three-cause' effect, such as trichloromethane, chloroacetic acid and the like. In addition, liquid chlorine is not effective in killing cryptosporidium and its cysts. And cannot treat the coal slime and coal slag precipitated from the coal washing wastewater.
Disclosure of Invention
In order to solve the technical problems described in the background art, the invention provides a sludge retreatment type coal washing wastewater treatment method. This application adopts ultrasonic wave disinfection to avoid the production of harmful accessory substance, has avoided producing irreversible influence to human body and environment. The coal slime and the coal slag are treated by supercritical water oxidation, so that pollutants in the coal slime and the coal slag are completely removed, and further reprocessed products such as activated carbon and the like are prepared for utilizing resources. Therefore, zero discharge of coal washing wastewater is really achieved, clean water separated by filtering is repeatedly used for washing coal, water resources and water cost can be saved, and waste materials such as coal slime, coal slag and the like can be recycled and reprocessed every year.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a sludge retreatment type coal washing wastewater treatment method comprises the following steps:
a) the coal washing wastewater is sent into an oil separation tank for oil separation treatment, the oil separated from the oil separation tank is transported away and recovered, and the water separated from the oil separation tank is sent into a flocculation sedimentation tank;
b) separating the precipitate and the supernatant in a flocculation sedimentation tank of the water subjected to the oil removal treatment, and adding a flocculating agent into the tank to remove suspended matters in the water;
c) the supernatant separated from the flocculation sedimentation tank enters a disinfection tank for ultrasonic disinfection, and the separated precipitate is sent into a supercritical water oxidation system for treatment, organic matters in the precipitate are oxidized into carbon dioxide and water, meanwhile, the intermediate converted matter is also completely decomposed, and the treated precipitate is prepared into activated carbon;
d) the water after the ultrasonic disinfection is sent into a multi-medium filter for multi-medium filtration, so that suspended impurities in the water are removed;
e) the water filtered by the multi-media is sent into an ultrafilter for ultrafiltration;
f) and finally, performing reverse osmosis on the ultrafiltered water through a reverse osmosis membrane to obtain recyclable water.
Specifically, the flocculant is polyacrylamide.
The invention has the beneficial effects that: the invention provides a sludge retreatment type coal washing wastewater treatment method. This application adopts ultrasonic wave disinfection to avoid the production of harmful accessory substance, has avoided producing irreversible influence to human body and environment. The coal slime and the coal slag are treated by supercritical water oxidation, so that pollutants in the coal slime and the coal slag are completely removed, and further reprocessed products such as activated carbon and the like are prepared for utilizing resources. Therefore, zero discharge of coal washing wastewater is really achieved, clean water separated by filtering is repeatedly used for washing coal, water resources and water cost can be saved, and waste materials such as coal slime, coal slag and the like can be recycled and reprocessed every year.
Drawings
The invention is further described with reference to the following figures and examples.
FIG. 1 is a schematic diagram of the framework of the present invention;
Detailed Description
The invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams illustrating only the basic structure of the invention in a schematic manner, and thus show only the constitution related to the invention.
Fig. 1 is a schematic diagram of the framework of the present invention.
As shown in the attached figure 1, the sludge retreatment type coal washing wastewater treatment method comprises the following steps:
a) the coal washing wastewater is sent into an oil separation tank for oil separation treatment, the oil separated from the oil separation tank is transported away and recovered, and the water separated from the oil separation tank is sent into a flocculation sedimentation tank;
b) separating the precipitate and the supernatant in a flocculation sedimentation tank of the water subjected to the oil removal treatment, and adding a flocculating agent into the tank to remove suspended matters in the water;
c) the supernatant separated from the flocculation sedimentation tank enters a disinfection tank for ultrasonic disinfection, and the separated precipitate is sent into a supercritical water oxidation system for treatment, organic matters in the precipitate are oxidized into carbon dioxide and water, meanwhile, the intermediate converted matter is also completely decomposed, and the treated precipitate is prepared into activated carbon;
d) the water after the ultrasonic disinfection is sent into a multi-medium filter for multi-medium filtration, so that suspended impurities in the water are removed;
e) the water filtered by the multi-media is sent into an ultrafilter for ultrafiltration;
f) and finally, performing reverse osmosis on the ultrafiltered water through a reverse osmosis membrane to obtain recyclable water.
The flocculating agent is polyacrylamide.
Supercritical Water Oxidation (SCWO) technology is a technology capable of realizing deep Oxidation treatment of various organic wastes. Supercritical water oxidation is to completely oxidize organic matters into clean substances such as H2O, CO2, N2 and the like through oxidation, S, P and the like are converted into salts with the highest valence for stabilization, and heavy metal oxidation stabilization solid phase exists in ash. The principle of the Supercritical Water Oxidation (SCWO) technology is that Supercritical Water is used as a reaction medium, and organic matters are rapidly converted into CO2, H2O, N2 and other harmless small molecules through a homogeneous Oxidation reaction.
The supercritical water oxidation is used for treating the coal slime and the coal slag, so that pollutants in the coal slime and the coal slag are completely removed, and further, reprocessing products such as activated carbon and the like are prepared for utilizing resources. Therefore, zero emission of the coal washing wastewater is really achieved, the clear water separated by filtering is repeatedly used for washing coal, water resources and water cost can be saved, the waste such as coal slime, coal slag and the like can be recycled and reprocessed every year, considerable economic benefits can be obtained, the coal washing wastewater is treated, high pollution discharge cost can be avoided, the obtained economic benefits can not only offset the operation cost of wastewater treatment, but also can obtain additional economic benefits.
The multi-medium filter is a process of making high-turbidity water pass through granular or non-granular material with a certain thickness under a certain pressure by using one or several kinds of filter media so as to effectively remove suspended impurities and make the water clear, and the commonly used filter materials include quartz sand, anthracite, manganese sand and the like, and are mainly used for removing turbidity and softening water in water treatment, pre-treatment of pure water and the like, and the turbidity of the effluent can reach below 3 ℃.
Ultrafiltration is one of the membrane separation techniques using pressure as the driving force. The pore diameter of the membrane is between 20 and 1000A DEG for the purpose of separating macromolecules from small molecules. The hollow fiber ultrafilter (membrane) has the advantages of high filling density in a unit container, small occupied area and the like.
Reverse osmosis, also known as reverse osmosis, is a membrane separation operation that uses a pressure differential as a driving force to separate a solvent from a solution. Reverse osmosis is known because it is in the opposite direction to natural osmosis. According to different osmotic pressures of various materials, a reverse osmosis pressure which is larger than the osmotic pressure, namely a reverse osmosis method, can be used for achieving the purposes of separation, extraction, purification and concentration.
The sterilization and disinfection mechanism of the ultrasonic wave is that the ultrasonic wave can perform ultrasonic cavitation in liquid to instantly generate hundreds of millions of cavitation micro bubbles, a plurality of cavitation bubbles are instantly generated and instantly exploded, meanwhile, the temperature of the liquid is continuously increased along with high temperature and high pressure, a hand is stretched into the liquid to feel pinprick, the cavitation generates strong mechanical shearing action, and the cell walls of microorganisms can be broken, so that the cell contents overflow out of the cell walls, and thus, certain components in the cells, such as DNA, RNA, amino acid, alkaloid, protein and the like can be extracted. The adoption of ultrasonic wave sterilization avoids the generation of harmful byproducts and the irreversible influence on human bodies and the environment. If the sterilization is incomplete at this stage, and then microorganisms such as bacteria enter the membrane component, the operation of the membrane treatment process can be directly influenced, and the ultrasonic wave is more comprehensive and thorough than chlorine-throwing sterilization, so that the ultrasonic membrane treatment process is a good driving protection for the subsequent membrane treatment process.
In light of the foregoing description of preferred embodiments according to the invention, many modifications and variations can be made by the worker skilled in the art without departing from the scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (2)
1. A sludge retreatment type coal washing wastewater treatment method is characterized in that: the method comprises the following steps:
a) the coal washing wastewater is sent into an oil separation tank for oil separation treatment, the oil separated from the oil separation tank is transported away and recovered, and the water separated from the oil separation tank is sent into a flocculation sedimentation tank;
b) separating the precipitate and the supernatant in a flocculation sedimentation tank of the water subjected to the oil removal treatment, and adding a flocculating agent into the tank to remove suspended matters in the water;
c) the supernatant separated from the flocculation sedimentation tank enters a disinfection tank for ultrasonic disinfection, and the separated precipitate is sent into a supercritical water oxidation system for treatment, organic matters in the precipitate are oxidized into carbon dioxide and water, meanwhile, the intermediate converted matter is also completely decomposed, and the treated precipitate is prepared into activated carbon;
d) the water after the ultrasonic disinfection is sent into a multi-medium filter for multi-medium filtration, so that suspended impurities in the water are removed;
e) the water filtered by the multi-media is sent into an ultrafilter for ultrafiltration;
f) and finally, performing reverse osmosis on the ultrafiltered water through a reverse osmosis membrane to obtain recyclable water.
2. The method for treating sludge reprocessing type coal washing wastewater according to claim 1, characterized in that: the flocculant is polyacrylamide.
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| CN202010935121.0A CN112062339A (en) | 2020-09-08 | 2020-09-08 | Sludge retreatment type coal washing wastewater treatment method |
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| CN202010935121.0A CN112062339A (en) | 2020-09-08 | 2020-09-08 | Sludge retreatment type coal washing wastewater treatment method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112876036A (en) * | 2021-02-23 | 2021-06-01 | 扬州阿鲁达环境科技有限公司 | Ultrasonic-based oily sludge treatment system and process |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103613253A (en) * | 2013-12-12 | 2014-03-05 | 北京赛科康仑环保科技有限公司 | Coal upgrading wastewater treatment process |
| CN105967405A (en) * | 2016-06-28 | 2016-09-28 | 南京德邦金属装备工程股份有限公司 | Treating and recycling method of coal washing wastewater |
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- 2020-09-08 CN CN202010935121.0A patent/CN112062339A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103613253A (en) * | 2013-12-12 | 2014-03-05 | 北京赛科康仑环保科技有限公司 | Coal upgrading wastewater treatment process |
| CN105967405A (en) * | 2016-06-28 | 2016-09-28 | 南京德邦金属装备工程股份有限公司 | Treating and recycling method of coal washing wastewater |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112876036A (en) * | 2021-02-23 | 2021-06-01 | 扬州阿鲁达环境科技有限公司 | Ultrasonic-based oily sludge treatment system and process |
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