CN111573984A - Coal washing wastewater treatment system - Google Patents
Coal washing wastewater treatment system Download PDFInfo
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- CN111573984A CN111573984A CN202010453579.2A CN202010453579A CN111573984A CN 111573984 A CN111573984 A CN 111573984A CN 202010453579 A CN202010453579 A CN 202010453579A CN 111573984 A CN111573984 A CN 111573984A
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- coal washing
- washing wastewater
- wastewater treatment
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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
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/10—Nature of the water, waste water, sewage or sludge to be treated from quarries or from mining activities
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention discloses a coal washing wastewater treatment system which comprises a residual sludge bin, a freezing bin, a high-temperature steam wall breaking system, a centrifugal device, a flocculation treatment tank and a solid-liquid separation device, wherein silicon dioxide with the particle size of less than 0.075mm in solid waste generated after coal washing wastewater treatment is used as a main component, the silicon dioxide is subjected to dehydration drying treatment, caustic soda is added, a product obtained after calcination and grinding and calcination is added with a hydrochloric acid solution and/or acid mine wastewater for activation treatment, iron and aluminum particles in residual sludge and lime added in the coal washing wastewater process are combined to finally form aluminum-iron-calcium polysilicate, and the sedimentation efficiency of the coal washing wastewater is remarkably improved.
Description
Technical Field
The invention belongs to the field of coal washing wastewater treatment, and particularly relates to a coal washing wastewater treatment system.
Background
The wet coal preparation needs a large amount of water, for example, jigging coal washing, 3-5 cubic meters of circulating water is needed for each 1t of raw coal, and part of clear water is needed to be supplemented, and the water can become wastewater containing a large amount of oil and fine particles, and the coal washing water containing suspended particles with the particle size of less than 1mm is generally called coal slime water and also called coal washing wastewater.
In the actual production process, the coal washing wastewater is a weakly alkaline stable colloid dispersion system and has the following remarkable characteristics: high suspended matter concentration (50-90g/L), high COD concentration, high fine particle content (the particle content smaller than 0.075mm is generally 50-60%), poor filtering performance, strong negative charge on the particle surface, high viscosity, small density of coal slime particles and the like; the coal washing wastewater is an industrial wastewater which is difficult to treat, and the main reason for the difficulty in treatment is that suspended particles have strong negative charges, so that the suspended particles become a stable colloidal dispersion system.
In the prior art, a large amount of coagulant and flocculant are added for treatment, although organic and inorganic flocculants can meet industrial requirements to a certain extent, the inorganic flocculant easily brings a large amount of inorganic ions into treated water, the polyacrylamide organic polymer flocculant is not easy to degrade, and a polymerized monomer of the polyacrylamide organic polymer flocculant has strong neurotoxicity. Bioflocculants have been the focus of research due to their environmentally friendly and readily degradable nature. CN105712494B discloses a method for treating mining wastewater by coagulation of a microbial flocculant and a surfactant, which solves the problems of large using amount, long flocculation time and the like of the conventional microbial flocculant, but is only limited to the treatment of simulated wastewater, and is difficult to have significant influence on coal washing wastewater in a colloidal state in the mining wastewater in actual application. The practical effects of microbial flocculants are not fully exerted.
Disclosure of Invention
The invention aims to provide a coal washing wastewater treatment system.
The purpose of the invention is realized by adopting the following technical scheme:
the invention discloses a coal washing wastewater treatment system which is characterized by comprising a residual sludge bin 1, a freezing bin 2, a high-temperature steam wall breaking system 3, a centrifugal device 4, a flocculation treatment tank 5 and a solid-liquid separation device 6; the residual sludge bin 1 is connected with the freezing bin 2, residual sludge is frozen in the freezing bin 2, the frozen residual sludge is conveyed to the high-temperature steam wall breaking system 3, high-temperature steam is introduced into the high-temperature steam wall breaking system 3 for wall breaking treatment to form sludge slurry, the sludge slurry after wall breaking is conveyed to the centrifugal device 4, and centrifugal supernatant after centrifugation is used as a residual sludge flocculant and conveyed to the residual sludge flocculant tank 7 for storage;
the flocculation treatment tank 5 is provided with a residual sludge flocculating agent tank 7 and a lime turbid liquid storage tank 8, and the flocculation sedimentation tank 5 is connected with a solid-liquid separation device 6.
Further, an ultrasonic device 9 is arranged in the high-temperature steam wall breaking system 3, and ultrasonic crushing is carried out for 10-25min during high-temperature steam wall breaking;
further, an acid mine wastewater inlet pipe is also arranged on the flocculation treatment tank 5; adding the acid mine wastewater to adjust the pH value to 6.5-8 under the condition of stirring;
further, the hydraulic screening removes particles with the particle size larger than 0.075mm in the coal washing wastewater;
further, a calcining furnace is arranged, the solid-liquid separation device 6 is communicated with the calcining furnace, solid waste generated by the solid-liquid separation device 6 is dehydrated, dried and calcined, and then the calcined residue is subjected to ball milling to prepare a porous material with the particle size of 1-5 mm;
further, a porous material dosing bin is arranged on the flocculation sedimentation tank;
further, after the solid waste is dehydrated and dried, the solid waste is dehydrated and dried according to the mass ratio of 10: adding caustic soda according to the proportion of 1, grinding to 0.05-0.2mm after calcining, adding a hydrochloric acid solution and/or acid mine wastewater into a calcined product, adjusting the pH to 3-5, stirring for 30-75min under a heating condition, cooling to room temperature after the reaction is finished, and removing waste residues to obtain a solution containing aluminum-iron-calcium polysilicate;
further, the aluminum-iron calcium polysilicate is mixed with the residual sludge flocculant according to the volume ratio of 1-10:20-50 to replace the residual sludge flocculant in the step (4);
further, the lime suspension liquid has the concentration of 3-5 percent, and the dosage is 1.8-3.5 g/L;
further, the calcination is carried out in a calcination furnace, and the sintering temperature in the calcination furnace is 1250-1800 ℃;
further, the dosage of the porous material is 5-9 g/L;
further, the solid-liquid separation device is one or combination of plate-frame filtration and secondary sedimentation tank sedimentation;
further, the pretreatment comprises grating and hydraulic screening.
The coal washing wastewater treatment process disclosed by the invention at least has the following advantages:
1. residual sludge, lime and the like of a coal mine water treatment plant are used as main flocculating agents, and nondegradable organic matters and metal ions influencing water quality chromaticity and turbidity are not introduced;
2. the method has the advantages that the method adopts the residual sludge of the coal mine water treatment plant and the solid waste generated by coal washing wastewater to produce and sell by itself, only a small amount of lime is used, so that the medicament cost and the possibility of secondary pollution are reduced;
3. silicon dioxide in solid waste generated after coal washing wastewater treatment is a main component, the solid waste is subjected to dehydration and drying treatment, caustic soda is added, a product obtained after calcination and grinding is added with a hydrochloric acid solution and/or acid mine wastewater for activation treatment, iron and aluminum particles in residual sludge are combined with lime added in the coal washing wastewater process, and finally calcium iron polysilicate is formed, so that the sedimentation efficiency of the coal washing wastewater is remarkably improved;
4. after lime and/or polysilicate aluminum ferric are added into the coal washing wastewater, calcium ions, iron ions and aluminum particles neutralize colloid with negative charges, and the sedimentation performance of the microbial flocculant is remarkably improved after the microbial flocculant is added;
5. the solid waste generated after the coal washing wastewater is treated by the microbial flocculant and the lime is calcined, and the solid waste contains the microbial flocculant and the coal powder, so that the use amount of fuel of a calciner is reduced, and the yield of coal mine waste is effectively reduced.
Drawings
FIG. 1 is a schematic view of a coal washing wastewater treatment system.
Detailed Description
The present invention is further described in detail below with reference to examples so that those skilled in the art can practice the invention with reference to the description.
It will be understood that terms such as "having," "including," and "comprising," when used herein, do not preclude the presence or addition of one or more other elements or groups thereof.
Example 1
A coal washing wastewater treatment system is characterized by comprising a residual sludge bin 1, a freezing bin 2, a high-temperature steam wall breaking system 3, a centrifugal device 4, a flocculation treatment tank 5 and a solid-liquid separation device 6; the residual sludge bin 1 is connected with the freezing bin 2, residual sludge is frozen in the freezing bin 2, the frozen residual sludge is conveyed to the high-temperature steam wall breaking system 3, high-temperature steam is introduced into the high-temperature steam wall breaking system 3 for wall breaking treatment to form sludge slurry, the sludge slurry after wall breaking is conveyed to the centrifugal device 4, and centrifugal supernatant after centrifugation is used as a residual sludge flocculant and conveyed to the residual sludge flocculant tank 7 for storage; the flocculation treatment tank 5 is provided with a residual sludge flocculant tank 7 and a lime suspension storage tank 8, the flocculation sedimentation tank 5 is connected with a solid-liquid separation device 6, the high-temperature steam wall breaking system 3 is provided with an ultrasonic device 9, and the flocculation treatment tank 5 is also provided with a porous material dosing bin 10 and an acid mine wastewater inlet pipe 11; the device is also provided with a calcining furnace 12, the solid-liquid separation device 6 is communicated with the calcining furnace, the solid-liquid separation device is a plate-frame filtration and secondary sedimentation tank, and the pretreatment comprises a grid and hydraulic screening.
The water quality of coal washing wastewater of a certain coal mine is as follows: pH value: 8.76, SS: 64.618g/L, COD: 19877 mg/L;
the method comprises the following steps:
(1) taking excess sludge generated by a coal mine water treatment plant;
(2) freezing the excess sludge obtained in the step (1), performing high-temperature steam wall breaking treatment on the frozen excess sludge, performing ultrasonic crushing for 10-25min during the high-temperature steam wall breaking treatment, performing first centrifugal separation, and taking centrifugal supernatant to obtain an excess sludge flocculating agent;
(3) adding lime suspension into the pretreated coal washing wastewater, and stirring, wherein the concentration of the lime suspension is 3%, and the dosage is 2 g/L; the pretreatment comprises a grid and a hydraulic screening, wherein the hydraulic screening removes particles with the particle size of more than 0.075mm in the coal washing wastewater;
(4) adding the residual sludge flocculating agent into the coal washing wastewater added with the lime suspension, and stirring, wherein the dosage of the biological sludge flocculating agent is 1.0 g/L;
(5) adding the acid mine wastewater to adjust the pH value to 6.5-8 under the condition of stirring;
(6) and finally, carrying out solid-liquid separation, wherein the solid-liquid separation is to firstly enter a secondary sedimentation tank for sedimentation for 150min and then carry out plate-and-frame filtration.
The pH value of effluent water is: 8.10, SS: 108g/L, COD: 84 mg/L.
Example 2
The quality of the mine water and the quality of the coal washing wastewater are the same as those of the example 1;
the experimental conditions were the same as in example 1;
and solid waste generated by the solid-liquid separation is dehydrated and dried, and then the solid waste is obtained by mixing the following raw materials in a mass ratio of 10: adding caustic soda according to the proportion of 1, grinding to 0.05-0.2mm after calcining, adding a hydrochloric acid solution and/or acid mine wastewater into a calcined product, adjusting the pH to 3-5, stirring for 60min under a heating condition, cooling to room temperature after the reaction is finished, and removing waste residues to obtain a solution containing aluminum-iron-calcium polysilicate; the aluminum-iron calcium polysilicate is mixed with the residual sludge flocculant according to the volume ratio of 5:30 to replace the residual sludge flocculant in the step (4);
the pH value of effluent water is: 8.07, SS: 89g/L, COD: 56 mg/L.
Example 3
The quality of the mine water and the quality of the coal washing wastewater are the same as those of the example 1;
the experimental conditions were the same as in example 1;
dehydrating and drying the solid waste generated by the solid-liquid separation, calcining, and then ball-milling the calcined residue to prepare a porous material with the particle size of 1-5mm, wherein the porous material is added in the step 4, the calcination is carried out in a calcining furnace, the sintering temperature in the calcining furnace is 1250-1800 ℃, and the adding amount of the porous material is 5-9 g/L;
the pH value of effluent water is: 7.93, SS: 98g/L, COD: 69 mg/L.
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable to various fields of endeavor for which the invention may be embodied with additional modifications as would be readily apparent to those skilled in the art, and the invention is therefore not limited to the details given herein and to the embodiments shown and described without departing from the generic concept as defined by the claims and their equivalents.
Claims (10)
1. A coal washing wastewater treatment system is characterized by comprising a residual sludge bin (1), a freezing bin (2), a high-temperature steam wall breaking system (3), a centrifugal device (4), a flocculation treatment tank (5) and a solid-liquid separation device (6); the residual sludge bin (1) is connected with the freezing bin (2), residual sludge is frozen in the freezing bin (2), the frozen residual sludge is conveyed to the high-temperature steam wall breaking system (3), high-temperature steam is introduced into the high-temperature steam wall breaking system (3) for wall breaking treatment to form sludge slurry, the sludge slurry after wall breaking is conveyed to the centrifugal device (4), and centrifugal supernatant after centrifugation is used as a residual sludge flocculating agent and conveyed to the residual sludge flocculating agent tank (7) for storage;
the flocculation treatment tank (5) is provided with a residual sludge flocculant tank (7) and a lime suspension storage tank (8), and the flocculation sedimentation tank (5) is connected with a solid-liquid separation device (6).
2. The coal washing wastewater treatment system as claimed in claim 1, wherein an ultrasonic device (9) is arranged in the high-temperature steam wall breaking system (3).
3. The coal washing wastewater treatment system as set forth in claim 1, characterized in that the flocculation basin (5) is further provided with an acid mine wastewater inlet pipe.
4. The coal washing wastewater treatment system of claim 1, wherein the solid-liquid separation device is one of plate-frame filtration and secondary sedimentation or a combination thereof, and the pretreatment comprises grating and hydraulic screening.
5. The coal washing wastewater treatment system of claim 4, wherein the hydraulic screening removes particles with a particle size of more than 0.075mm from the coal washing wastewater.
6. The coal washing wastewater treatment system as set forth in claim 1, characterized in that the system is further provided with a calcining furnace, the solid-liquid separation device (6) is communicated with the calcining furnace, the solid waste generated by the solid-liquid separation device (6) is dehydrated, dried and calcined, and then the calcined residue is ball-milled to prepare a porous material with a particle size of 1-5 mm.
7. The coal washing wastewater treatment system of claim 1, wherein the solid waste, after being dehydrated and dried, is treated in a mass ratio of 10: adding caustic soda according to the proportion of 1, calcining in the calcining furnace, grinding to 0.05-0.2mm, adding a hydrochloric acid solution and/or acid mine wastewater into a calcined product, adjusting the pH to 3-5, stirring for 30-75min under a heating condition, cooling to room temperature after the reaction is finished, and removing waste residues to obtain a solution containing aluminum-iron-calcium polysilicate.
8. The coal washing wastewater treatment system of claim 1, wherein the flocculation sedimentation tank is provided with a calcium iron polysilicate dosing pipe.
9. The coal washing wastewater treatment system as claimed in claim 6 or 7, wherein the calcination is performed in a calciner, and the sintering temperature in the calciner is 1250-.
10. The coal washing wastewater treatment system of claim 1, wherein a porous material dosing bin is arranged on the flocculation sedimentation tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010453579.2A CN111573984A (en) | 2020-05-26 | 2020-05-26 | Coal washing wastewater treatment system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010453579.2A CN111573984A (en) | 2020-05-26 | 2020-05-26 | Coal washing wastewater treatment system |
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| CN111573984A true CN111573984A (en) | 2020-08-25 |
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| CN202010453579.2A Withdrawn CN111573984A (en) | 2020-05-26 | 2020-05-26 | Coal washing wastewater treatment system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112254496A (en) * | 2020-09-25 | 2021-01-22 | 榆林学院 | Coal slime collection device |
| CN115465869A (en) * | 2022-10-31 | 2022-12-13 | 陕西科技大学 | Method for preparing calcium iron polysilicate from gasified slag |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102153182A (en) * | 2011-02-25 | 2011-08-17 | 同济大学 | Method for extracting bioflocculant from excess activated sludge |
| CN103288195A (en) * | 2013-06-28 | 2013-09-11 | 武汉科梦环境工程有限公司 | Method for preparing polysilicate composite coagulant from solid mineral by one-step process |
| CN105366777A (en) * | 2014-08-19 | 2016-03-02 | 武汉宏安伟立科技有限公司 | Method for preparing coal washing wastewater flocculant by using fly ash and pyrite sintered slag |
| CN108996753A (en) * | 2018-08-14 | 2018-12-14 | 冷应杰 | A kind of coal chemical industrial waste water purifying treatment method |
-
2020
- 2020-05-26 CN CN202010453579.2A patent/CN111573984A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102153182A (en) * | 2011-02-25 | 2011-08-17 | 同济大学 | Method for extracting bioflocculant from excess activated sludge |
| CN103288195A (en) * | 2013-06-28 | 2013-09-11 | 武汉科梦环境工程有限公司 | Method for preparing polysilicate composite coagulant from solid mineral by one-step process |
| CN105366777A (en) * | 2014-08-19 | 2016-03-02 | 武汉宏安伟立科技有限公司 | Method for preparing coal washing wastewater flocculant by using fly ash and pyrite sintered slag |
| CN108996753A (en) * | 2018-08-14 | 2018-12-14 | 冷应杰 | A kind of coal chemical industrial waste water purifying treatment method |
Non-Patent Citations (2)
| Title |
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| 李希勇等: "《龙固深部特大型矿井建设与生产技术》", 31 December 2011, 中国矿业大学出版社 * |
| 祁鲁梁等: "《水处理药剂及材料实用手册》", 31 March 2000, 中国石化出版社 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112254496A (en) * | 2020-09-25 | 2021-01-22 | 榆林学院 | Coal slime collection device |
| CN115465869A (en) * | 2022-10-31 | 2022-12-13 | 陕西科技大学 | Method for preparing calcium iron polysilicate from gasified slag |
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Application publication date: 20200825 |