CN112645520A - Recycling method of sludge press-filtration wastewater - Google Patents
Recycling method of sludge press-filtration wastewater Download PDFInfo
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- CN112645520A CN112645520A CN202011247104.4A CN202011247104A CN112645520A CN 112645520 A CN112645520 A CN 112645520A CN 202011247104 A CN202011247104 A CN 202011247104A CN 112645520 A CN112645520 A CN 112645520A
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- filtration
- wastewater
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- fine filtration
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- 238000001914 filtration Methods 0.000 title claims abstract description 68
- 239000002351 wastewater Substances 0.000 title claims abstract description 57
- 239000010802 sludge Substances 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000004064 recycling Methods 0.000 title claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 25
- 238000001704 evaporation Methods 0.000 claims abstract description 13
- 230000008020 evaporation Effects 0.000 claims abstract description 9
- 239000000835 fiber Substances 0.000 claims description 10
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical group [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 9
- 229920000728 polyester Polymers 0.000 claims description 6
- -1 polypropylene Polymers 0.000 claims description 6
- 239000004743 Polypropylene Substances 0.000 claims description 4
- 238000001728 nano-filtration Methods 0.000 claims description 4
- 229920001155 polypropylene Polymers 0.000 claims description 4
- CDBYLPFSWZWCQE-UHFFFAOYSA-L sodium carbonate Substances [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 4
- 239000013505 freshwater Substances 0.000 claims description 3
- 238000011085 pressure filtration Methods 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 2
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 2
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 2
- 239000000956 alloy Substances 0.000 description 12
- 229910045601 alloy Inorganic materials 0.000 description 10
- 239000004519 grease Substances 0.000 description 8
- 150000003839 salts Chemical class 0.000 description 8
- 238000005554 pickling Methods 0.000 description 6
- 238000003825 pressing Methods 0.000 description 5
- 229910000838 Al alloy Inorganic materials 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000005491 wire drawing Methods 0.000 description 3
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 2
- 235000011941 Tilia x europaea Nutrition 0.000 description 2
- 238000005485 electric heating Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000009776 industrial production Methods 0.000 description 2
- 239000004571 lime Substances 0.000 description 2
- 239000008267 milk Substances 0.000 description 2
- 210000004080 milk Anatomy 0.000 description 2
- 235000013336 milk Nutrition 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006386 neutralization reaction Methods 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000003311 flocculating effect Effects 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Images
Classifications
-
- 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
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/041—Treatment of water, waste water, or sewage by heating by distillation or evaporation by means of vapour compression
-
- 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
- C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
-
- 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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/16—Nature of the water, waste water, sewage or sludge to be treated from metallurgical processes, i.e. from the production, refining or treatment of metals, e.g. galvanic wastes
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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 Using Semi-Permeable Membranes (AREA)
Abstract
The invention discloses a recycling method of sludge press filtration wastewater, which comprises the following steps: (1) adjusting the pH value; (2) primary fine filtration; (3) evaporating; (4) secondary fine filtering. According to the method for recycling the sludge press-filtration wastewater, the purity of the wastewater is effectively improved through pH value adjustment, evaporation and two-stage fine filtration treatment, the use level of reuse water is reached, the sludge press-filtration wastewater is effectively recycled, and finally zero discharge of the wastewater and full and reasonable utilization of water resources are realized.
Description
Technical Field
The invention relates to the field of wastewater treatment, in particular to a method for recycling sludge press filtration wastewater in electrothermal alloy wire pickling solution.
Background
The electrothermal alloy is an alloy material for manufacturing an electrothermal element, is an aluminum alloy material and comprises iron-chromium-aluminum alloy and nickel-chromium-aluminum alloy. The electrothermal alloy wire is easy to oxidize in the production process, and the surface of the electrothermal alloy wire is covered with an oxide layer; during the rough wire drawing process, a lubricant is needed to be used, so that oxide skin on the surface of the resistance wire always floats on the surface of the wire along with the gradual reduction of a wire drawing die in the wire drawing process, and an oxide skin layer and partial grease are attached to the surface of a finished product of the electrothermal alloy wire, so that the use performance of the electrothermal alloy wire is influenced.
The pickling solution of the electric heating alloy wire usually contains a certain amount of impurities such as grease, salt and the like, and in the prior art, the method for treating the pickling solution of the electric heating alloy wire mostly adopts a lime milk adding neutralization mode and the like, so that the pickling solution after neutralization treatment inevitably contains impurities such as grease, salt, a large amount of mud and the like, sedimentation filtration is needed to collect sediments, and a certain amount of mud still remains after anhydrous water after sedimentation is evaporated by MVR equipment.
Disclosure of Invention
The invention mainly solves the technical problem of providing a recycling method of sludge press filtration wastewater, which can solve the problems existing in the prior art that the press filtration wastewater is directly discharged.
In order to solve the technical problems, the invention adopts a technical scheme that: the method for recycling the sludge press-filtration wastewater comprises the following steps:
(1) adjusting the pH value: collecting sludge filter-pressing wastewater, testing the pH value of the sludge filter-pressing wastewater, adding a pH value regulator under a stirring state, and regulating the pH value of the sludge filter-pressing wastewater to 7-8;
(2) primary fine filtration: carrying out fine filtration treatment on the wastewater after the pH value is adjusted by using a primary fine filtration filter;
(3) and (3) evaporation: evaporating and condensing the waste water after fine filtration by using an MVR evaporator, and converting the waste water into condensate;
(4) secondary fine filtration: and (4) carrying out fine filtration treatment on the condensate obtained in the step (3) by using a secondary nanofiltration system, and reusing fresh water obtained by fine filtration as reuse water.
In a preferred embodiment of the invention, the concentrated water obtained by the primary fine filtration and the secondary fine filtration in the steps (2) and (4) is added into the sludge for pressure filtration again, and the obtained wastewater is treated by repeating the steps (1) to (4).
In a preferred embodiment of the present invention, the solid obtained after evaporation in step (3) is collected and incinerated.
In a preferred embodiment of the present invention, in the step (1), the pH regulator is sodium hydroxide, sodium carbonate or ammonia water.
In a preferred embodiment of the present invention, the filter element of the primary fine filter is a hollow polyester fiber or polypropylene fiber with a diameter of 5 um.
In a preferred embodiment of the present invention, the filter element of the secondary fine filter is hollow polyester fiber or polypropylene fiber with a diameter of 1 um.
The invention has the beneficial effects that: according to the method for recycling the sludge press-filtration wastewater, the purity of the wastewater is effectively improved through pH value adjustment, evaporation and two-stage fine filtration treatment, the use level of reuse water is reached, the sludge press-filtration wastewater is effectively recycled, and finally zero discharge of the wastewater and full and reasonable utilization of water resources are realized.
Drawings
FIG. 1 is a schematic view of the treatment process of the method for recycling sludge press filtration wastewater of the present invention.
Detailed Description
The following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will make the advantages and features of the invention easier to understand by those skilled in the art, and thus will clearly and clearly define the scope of the invention.
Referring to fig. 1, an embodiment of the present invention includes:
the invention discloses a recycling method of sludge press filtration wastewater, which can carry out secondary treatment and recycling on the press filtration wastewater generated by press filtration of sludge collected by a precipitation and/or flocculation process in the treatment process of electrothermal alloy wire pickling solution; the method comprises the following steps:
(1) adjusting the pH value: the method comprises the steps of settling, filtering and flocculating grease, salt and mud generated by adding neutralizers such as lime milk and the like into electrothermal alloy wire pickling waste liquid, collecting the settled grease, salt and mud, squeezing and filtering the collected grease, salt and mud by using a filter press, collecting filtered waste water, testing the pH value of the waste water, adding a pH value regulator into the waste water under a stirring state according to the actually measured pH value, and regulating the pH value of the waste water to be neutral or alkalescent, so that on one hand, corrosion of subsequent purification equipment and the waste water serving as reuse water to the equipment under an acidic state is avoided, on the other hand, the generation of salt is facilitated, and the subsequent further purification is facilitated;
for example, the pH value of the wastewater generated by the filtration is tested to be 5.6, a sodium hydroxide solution with the mass concentration of 15% is added thereto, and the pH value of the wastewater is adjusted to be 7.5;
(2) primary fine filtration: carrying out fine filtration treatment on the wastewater after the pH value is adjusted by using a primary fine filtration filter, wherein a filter element of the primary fine filtration filter is a hollow polyester fiber with the diameter of 5 um;
(3) and (3) evaporation: evaporating and condensing the waste water after fine filtration by using an MVR evaporator, and converting the waste water into condensate;
(4) secondary fine filtration: and (3) carrying out fine filtration treatment on the condensate obtained in the step (3) by using a secondary nanofiltration system, wherein a filter element of the secondary fine filtration filter is hollow polyester fiber with the diameter of 1um, and fresh water obtained by fine filtration reaches the standard of reuse water and is reused as reuse water, such as product flushing water, supply cooling water and the like.
And (3) adding concentrated water obtained by fine filtration and nanofiltration in the steps (2) and (4) into sludge for pressure filtration again, and repeating the steps (1) to (4) on the obtained wastewater.
And (3) adding the concentrated water obtained by the first-stage fine filtration and the concentrated water obtained by the second-stage fine filtration into the collected grease, salt and mud, carrying out filter pressing, and filtering water to repeat the steps (1) - (4).
The solid obtained after evaporation is collected and filtered with the partial pressure of grease, salt and mud to obtain solid for incineration treatment, so that zero discharge of waste water and full and reasonable utilization of water resources are realized, and the problem of industrial production water in areas short of water resources is effectively solved.
The method for recycling the sludge press filtration wastewater has the following advantages:
1. the waste water generated by filter pressing is collected and treated uniformly, a small amount of waste water is collected into a large amount, and considerable amount of recovered water can be obtained after the waste water is treated and can be used as production water, so that the problem of large water consumption in industrial production can be relieved to a certain extent;
2. through pH value adjustment, evaporation and two-stage fine filtration treatment, the purity of the wastewater is effectively improved, the use level of reuse water is reached, the effective recycling of sludge press filtration wastewater is realized, and finally, zero discharge of the wastewater and full and reasonable utilization of water resources are realized.
The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.
Claims (6)
1. A recycling method of sludge press filtration wastewater is characterized by comprising the following steps:
(1) adjusting the pH value: collecting sludge press filtration wastewater, testing the pH value of the sludge press filtration wastewater, adding a pH value regulator under a stirring state, and regulating the pH value of the sludge press filtration wastewater to 7-8;
(2) primary fine filtration: carrying out fine filtration treatment on the wastewater after the pH value is adjusted by using a primary fine filtration filter;
(3) and (3) evaporation: evaporating and condensing the waste water after fine filtration by using an MVR evaporator, and converting the waste water into condensate;
(4) secondary fine filtration: and (4) carrying out fine filtration treatment on the condensate obtained in the step (3) by using a secondary nanofiltration system, and reusing fresh water obtained by fine filtration as reuse water.
2. The method for recycling sludge press-filtration wastewater according to claim 1, wherein concentrated water obtained by the primary fine filtration and the secondary fine filtration in the steps (2) and (4) is added into sludge for pressure filtration again, and the obtained wastewater is treated by repeating the steps (1) to (4).
3. The method for recycling sludge press filtration wastewater according to claim 1, wherein the solid obtained after evaporation in the step (3) is collected and incinerated.
4. The method for recycling sludge press-filtration wastewater according to claim 1, wherein in the step (1), the pH value regulator is sodium hydroxide, sodium carbonate or ammonia water.
5. The method for recycling sludge press-filtration wastewater according to claim 1, wherein a filter element of the primary fine filtration filter is a hollow polyester fiber or polypropylene fiber with a diameter of 5 μm.
6. The method for recycling sludge press-filtration wastewater according to claim 1, wherein a filter element of the secondary fine filtration filter is a hollow polyester fiber or polypropylene fiber with a diameter of 1 um.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011247104.4A CN112645520A (en) | 2020-11-10 | 2020-11-10 | Recycling method of sludge press-filtration wastewater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011247104.4A CN112645520A (en) | 2020-11-10 | 2020-11-10 | Recycling method of sludge press-filtration wastewater |
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| Publication Number | Publication Date |
|---|---|
| CN112645520A true CN112645520A (en) | 2021-04-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011247104.4A Pending CN112645520A (en) | 2020-11-10 | 2020-11-10 | Recycling method of sludge press-filtration wastewater |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102826681A (en) * | 2012-08-27 | 2012-12-19 | 厦门世达膜科技有限公司 | Method for comprehensively processing waste water and exhaust gas from lead-zinc smeltery |
| CN105198143A (en) * | 2014-06-18 | 2015-12-30 | 中国石油化工股份有限公司 | High-concentration wastewater zero-discharging method |
| CN110092519A (en) * | 2019-05-13 | 2019-08-06 | 山东金汇膜科技股份有限公司 | A kind of silica gel wastewater treatment method |
| CN110921887A (en) * | 2019-11-05 | 2020-03-27 | 四川美富特环境治理有限责任公司 | Electroplating wastewater recycling treatment method |
| CN111453891A (en) * | 2020-05-21 | 2020-07-28 | 天津市海纳源科技有限公司 | Evaporation concentration recycling zero discharge system for phosphating wastewater treatment |
-
2020
- 2020-11-10 CN CN202011247104.4A patent/CN112645520A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102826681A (en) * | 2012-08-27 | 2012-12-19 | 厦门世达膜科技有限公司 | Method for comprehensively processing waste water and exhaust gas from lead-zinc smeltery |
| CN105198143A (en) * | 2014-06-18 | 2015-12-30 | 中国石油化工股份有限公司 | High-concentration wastewater zero-discharging method |
| CN110092519A (en) * | 2019-05-13 | 2019-08-06 | 山东金汇膜科技股份有限公司 | A kind of silica gel wastewater treatment method |
| CN110921887A (en) * | 2019-11-05 | 2020-03-27 | 四川美富特环境治理有限责任公司 | Electroplating wastewater recycling treatment method |
| CN111453891A (en) * | 2020-05-21 | 2020-07-28 | 天津市海纳源科技有限公司 | Evaporation concentration recycling zero discharge system for phosphating wastewater treatment |
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Application publication date: 20210413 |
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