CN112661328B - Production press filtration water treatment process - Google Patents
Production press filtration water treatment process Download PDFInfo
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- CN112661328B CN112661328B CN202011361976.3A CN202011361976A CN112661328B CN 112661328 B CN112661328 B CN 112661328B CN 202011361976 A CN202011361976 A CN 202011361976A CN 112661328 B CN112661328 B CN 112661328B
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Abstract
The invention discloses a production press filtration water treatment process, which comprises the following steps of a, feeding production press filtration water into a primary intermediate water tank to obtain a product A, B, pumping the product A to a primary membrane filter device to obtain concentrated calcium carbonate slurry and a product B, feeding the product C and the product B into a dissolved air flotation system, performing air flotation treatment to obtain scum and a product C, feeding the product D and the product C into a secondary intermediate water tank to enable the pH value of the product C to reach 8.5-8.9 to obtain a product D, pumping the product E and the product D into the secondary membrane filter device to obtain a product E and concentrated sewage, feeding the product F and the product E into a tertiary intermediate water tank to obtain a product F, feeding the product G and the product F into a full-automatic fiber bundle filter device through a water filtration pump to obtain backwash water and a product G, reflowing the backwash water to the secondary intermediate water tank, feeding the product H and the product G into a quaternary intermediate water tank to obtain a product H, pumping a small part of the product I and the product I into an adjusting tank to be treated to obtain treated water. The invention has the advantages of high treatment efficiency and good treatment effect.
Description
Technical Field
The invention belongs to the field of calcium carbonate production processes, and particularly relates to a press filtration water treatment process for calcium carbonate production.
Background
A large amount of press filtration water is generated in the production process of calcium carbonate, the press filtration water contains a large amount of calcium carbonate and a part of impurities, the environment is polluted by directly discharging the press filtration water, and a large amount of calcium carbonate raw materials are wasted, so that the press filtration water is necessary to be treated. The existing treatment process is to put the press filtration water into a pool for precipitation, recover a part of calcium carbonate precipitation and generate supernatant, and directly discharge the supernatant. Because calcium carbonate in the filter pressing water can be precipitated for a long time, the treatment efficiency of the filter pressing water is low, and in addition, a large amount of impurities are still contained in supernatant formed after the filter pressing water is precipitated, mainly comprising oil, scum and heavy metal ions, and certain environmental pollution can still be caused by direct discharge, so that the treatment effect of the filter pressing water is poor. Therefore, the existing filter-pressing water treatment process has the defects of low treatment efficiency and poor treatment effect.
Disclosure of Invention
The invention aims to provide a process for treating production press-filtered water. The invention has the advantages of high treatment efficiency and good treatment effect.
The technical scheme of the invention is as follows: a process for treating the pressure filtered water includes such steps as preparing the pressure filtered water, feeding it to the primary intermediate pool to obtain product A,
b. pumping the product A to a first-stage membrane filtering device, separating to obtain concentrated calcium carbonate slurry and product B, recovering the calcium carbonate slurry,
c. the product B enters a dissolved air flotation system, scum and a product C are obtained through air flotation treatment, the scum is burnt,
d. feeding product C into second-stage intermediate water tank, stirring, adding acid or alkali to make pH of product C reach 8.5-8.9 to obtain product D,
e. pumping the product D into a secondary membrane filtering device, separating to obtain a product E and concentrated sewage, introducing the sewage into a sewage treatment system,
f. the product E enters a third-level middle water tank to obtain a product F,
g. the product F enters a full-automatic fiber bundle filtering device through a water filtering pump to obtain backwash water and a product G, the backwash water flows back to a secondary intermediate water tank,
h. the product G enters a four-stage middle water pool to obtain a product H,
i. pumping a small part of the H product into a water cooling system for recycling, pumping the rest H product into a regulating tank to obtain an I product,
j. and (5) treating the product I to obtain treated water. In the step j, all the products I are subjected to aeration treatment to obtain treated water; or aerating a part of the I products to obtain treated water, treating the rest I products in an automatic water production device for nanofiltration of an ultrafiltration machine to obtain pure water and sewage with a first-level water quality standard, pumping the pure water to a storage pool for later use, and introducing the sewage to a sewage treatment system.
In the foregoing process for treating the production press filtration water, in the step d, the pH is 8.7.
In the aforesaid production press filtration water treatment process, realize the system that technology was used, including the middle pond of one-level, first water pump, one-level membrane filter equipment, dissolved air flotation system, the middle pond of second grade, the second water pump, second grade membrane filter equipment, the middle pond of tertiary, third water pump and full-automatic tow filter equipment that connect gradually, full-automatic tow filter equipment's back flush water discharge port is connected the middle pond of second grade, the middle pond of level four is connected through the middle pond of fourth water pump in the delivery port of full-automatic tow filter equipment, the middle pond of level four passes through the water cooling system of fourth water pump connection, the middle pond of level four passes through the fifth water pump connection equalizing basin, be equipped with aeration system in the equalizing basin, the equalizing basin is received automatic water making device through the ultrafiltration machine and is connected the storage pond, ultrafiltration machine receives automatic water making device and second grade membrane filter equipment and all is connected with sewage treatment system.
In the production press filtration water treatment process, the ultrafiltration machine nanofiltration automatic water production device consists of an ultrafiltration device and a nanofiltration device which are connected in series, the ultrafiltration device is connected with the regulating tank through a sixth water pump, the nanofiltration device is connected with the storage tank, and a drain outlet of the ultrafiltration device and a drain outlet of the nanofiltration device are both connected with the sewage treatment system.
In the production press filtration water treatment process, the sewage treatment system is connected with a washing water tank through a press filtration device.
In the production press filtration water treatment process, the full-automatic fiber bundle filtering device adopts asymmetric fiber bundles as filtering materials, the upper ends of the asymmetric fiber bundles are loose free ends, and the lower ends of the asymmetric fiber bundles are bound together, so that a continuous gradient density filter bed structure with a loose upper part and a dense lower part is formed.
In the production press filtration water treatment process, the full-automatic fiber bundle filtering device adopts air-water combined backwashing.
Compared with the prior art, the membrane filtration device is used for separating the filter pressing water, calcium carbonate in the filter pressing water is formed into slurry and is quickly separated out, long-time precipitation waiting time is not needed, and continuous production is realized, so that the treatment efficiency of the filter pressing water is improved by over 80 percent. The invention removes the scum and heavy metals in the filter-pressing water through the cooperation of a plurality of processes, carries out grading treatment, has good treatment effect, can obtain water with water quality reaching one grade by partial treatment, can be used for factory use, is free from discharge and does not cause environmental pollution. The filter material of the full-automatic fiber bundle filter device is improved, the asymmetric fiber bundle with loose upper end and compact lower end is used, the diameter of the existing fiber can be as small as several micrometers, so that the asymmetric fiber bundle has the advantages of large specific surface area and small filter resistance, the contact chance of impurity particles in water and the filter material and the adsorption capacity of the filter material are increased, the filter efficiency and the sewage interception capacity are improved, the filter efficiency is more than 3 times that of a common sand filter, the sewage interception capacity is more than 4 times that of the common sand filter, and the water quality filter effect is good. Because the density of the upper end and the lower end of the asymmetrical fiber bundle is different, during back flushing, the fibers at the upper end scatter and swing along with the back flushing water flow, and strong throwing drag force is generated, so that impurity particles adhered to the fibers can be thoroughly washed, the back flushing performance is good, the filtering effect of water quality is further improved, and after the impurity particles are treated by the full-automatic fiber bundle filtering device, more than 95% of the impurity particles can be filtered. Therefore, the invention has the advantages of high treatment efficiency and good treatment effect.
Drawings
Fig. 1 is a schematic diagram of the system.
The labels in the figures are: 1-a first-stage intermediate water tank, 2-a first water pump, 3-a first-stage membrane filtering device, 4-a dissolved air flotation system, 5-a second-stage intermediate water tank, 6-a second water pump, 7-a second-stage membrane filtering device, 8-a third-stage intermediate water tank, 9-a third water pump, 10-a full-automatic fiber bundle filtering device, 11-a fourth-stage intermediate water tank, 12-a fifth water pump, 13-a regulating tank, 14-an aeration system, 15-a storage tank, 16-a sewage treatment system, 17-an ultrafiltration device, 18-a nanofiltration device, 19-a washing water tank and 20-a filter pressing device.
Detailed Description
The invention is further described with reference to the following figures and examples, which are not to be construed as limiting the invention.
Examples are given. The system for realizing the production press filtration water treatment process comprises a first-stage intermediate water tank 1, a first water pump 2, a first-stage film filtering device 3, a dissolved air flotation system 4, a second-stage intermediate water tank 5, a second water pump 6, a second-stage film filtering device 7, a third-stage intermediate water tank 8, a third water pump 9 and a full-automatic fiber bundle filtering device 10 which are sequentially connected, wherein a reverse flushing water outlet of the full-automatic fiber bundle filtering device 10 is connected with the second-stage intermediate water tank 5, a water outlet of the full-automatic fiber bundle filtering device 10 is connected with a fourth-stage intermediate water tank 11, the fourth-stage intermediate water tank 11 is connected with a water cooling system (the fourth water pump and the water cooling system are not shown in the figure, the water cooling system is a system generally configured by a calcium carbonate manufacturer and used for cooling raw material slurry for preparing nano calcium carbonate, water in the fourth-stage intermediate water tank 11 is used for preparing the raw material slurry), the fourth-stage intermediate water tank 11 is connected with an adjusting tank 13 through a fifth water pump 12, an aeration system 14 is arranged in the adjusting tank 13, the adjusting tank 13 is connected with a storage tank 15 through an automatic water production device through an ultrafiltration water preparation device, and the ultrafiltration automatic water preparation device and the second-filtration device 7 are connected with a sewage treatment system 16.
The automatic water production device for nanofiltration of the ultrafiltration machine comprises an ultrafiltration device 17 and a nanofiltration device 18 which are connected in series, wherein the ultrafiltration device 17 is connected with a regulating tank 13 through a sixth water pump, the nanofiltration device 18 is connected with a storage tank 15, and a drain outlet of the ultrafiltration device 17 and a drain outlet of the nanofiltration device 18 are both connected with a sewage treatment system 16.
The sewage treatment system 16 is connected with a washing water tank 19 through a filter pressing device 20.
The full-automatic fiber bundle filtering device 10 is provided with two devices which are connected in parallel. The aeration system 14 comprises an aerator arranged outside the adjusting tank 13 and an aeration pipeline arranged at the bottom of the adjusting tank 13, and the aerator introduces oxygen into the aeration pipeline.
And a stirring device is arranged in the second-stage intermediate water tank 5, and is a paddle stirrer with the model number of JGM40-750-23.
The production press filtration water treatment process based on the system comprises the following steps,
a. the filter pressing water generated by the calcium carbonate production line enters a primary intermediate water tank 1 to obtain a product A,
b. pumping the product A to a first-stage membrane filtering device 3 through a first water pump 2, separating to obtain concentrated calcium carbonate slurry and a product B, recycling the calcium carbonate slurry for preparing calcium carbonate,
c. the product B enters a dissolved air flotation system 4, oil (stearic acid) in the product B is separated out through micro bubbles generated by the dissolved air flotation system 4 to obtain scum, air flotation is used for removing water (namely, the product C), the scum is incinerated,
d. feeding product C into second-stage intermediate water tank 5, stirring, adding sulfuric acid or calcium hydroxide according to pH of product C to make pH of product C reach 8.5-8.9, optimally 8.7, to obtain product D,
e. the D product is pumped into a secondary membrane filtering device 7 through a second water pump 6 and separated to obtain an E product and concentrated sewage, the sewage is introduced into a sewage treatment system 16,
f. the product E flows into a third-stage intermediate water tank 8 to obtain a product F,
g. the product F enters the full-automatic fiber bundle filtering device 10 through a water filtering pump, the full-automatic fiber bundle filtering device 10 can automatically perform backflushing and automatic filtering to obtain backflushing water and filtered water (namely product G), the backflushing water flows back to the secondary intermediate water tank 5,
h. the product G enters a four-stage middle water tank 11 to obtain a product H,
i. pumping a small part of H product into a water cooling system for recycling (for preparing nano calcium carbonate raw material slurry), pumping the rest H product into a digestion system as digestion water for treatment to obtain treated water, pumping the rest H product into an adjusting tank 13 when the digestion system is stopped to obtain a product I,
j. and (5) treating the product I to obtain treated water.
In the step j, performing aeration treatment on all the products I to obtain treated water; when the quantity of the I products is too large and all the I products are difficult to treat only through aeration treatment, a part of the I products are aerated to obtain treated water, the rest I products enter an automatic water preparation device for nanofiltration of an ultrafiltration machine to be treated to obtain sewage and pure water with a first-level water quality standard, the pure water is pumped to a storage pool 15 for standby, and the sewage is led to a sewage treatment system 16.
The sewage treatment system 16 is to the treatment mode of sewage, including adding substances such as PAC, PAM and lime breast, make the multiple ion combination in the sewage form the flocculent precipitate, then add acid or alkali, carry out neutralization reaction to sewage, sewage is neutral, then lets in filter pressing device, separates sewage, and the flocculent precipitate in the sewage is pressed to be the filter residue and discharges, and sewage can purify, can be as water such as the ground washing of mill.
The full-automatic fiber bundle filtering device 10 adopts asymmetric fiber bundles as filtering materials, the upper ends of the asymmetric fiber bundles are loose free ends, and the lower ends of the asymmetric fiber bundles are bound together and fixed on a solid body with high specific gravity, such as an iron block, so as to form a continuous gradient density filter bed structure with a loose upper part and a dense lower part, filtered water passes through the full-automatic fiber bundle filtering device 10 from an upper conducting wire during filtering, and backwash water passes through the full-automatic fiber bundle filtering device 10 from bottom to top during backwashing. The full-automatic fiber bundle filtering device 10 adopts air-water combined backwashing.
The invention has the advantages of high treatment efficiency and good treatment effect.
Claims (1)
1. A process for treating pressure filtration water in production is characterized in that: comprises the following steps of (a) carrying out,
a. the produced filter pressing water enters a first-stage intermediate water tank to obtain a product A,
b. pumping the product A to a first-stage membrane filtering device (3), separating to obtain concentrated calcium carbonate slurry and a product B, recovering the calcium carbonate slurry,
c. the product B enters a dissolved air flotation system (4) and is subjected to air flotation treatment to obtain scum and a product C, the scum is incinerated,
d. feeding product C into secondary intermediate water tank (5), stirring, adding acid or alkali to make product C pH 8.7 to obtain product D,
e. pumping the product D into a secondary membrane filtering device (7), separating to obtain a product E and concentrated sewage, introducing the sewage into a sewage treatment system (16),
f. the product E enters a third-level middle water tank (8) to obtain a product F,
g. the product F enters a full-automatic fiber bundle filtering device (10) through a water filtering pump to obtain backwash water and a product G, the backwash water flows back to a secondary intermediate water tank (5),
h. the product G enters a four-stage middle water pool (11) to obtain a product H,
i. pumping a small part of the H product into a water cooling system for recycling, pumping the rest H product into a regulating tank (13) to obtain an I product,
j. treating the product I to obtain treated water;
in the step j, all the products I are subjected to aeration treatment to obtain treated water; or a part of the products I are aerated to obtain treated water, the rest products I enter an automatic water production device for nanofiltration of an ultrafiltration machine to be treated to obtain pure water and sewage with a first-level water quality standard, the pure water is pumped to a storage pool (15) for standby, and the sewage is introduced to a sewage treatment system (16);
the system for realizing the process comprises a first-stage intermediate water tank (1), a first water pump (2), a first-stage film filtering device (3), a dissolved air flotation system (4), a second-stage intermediate water tank (5), a second water pump (6), a second-stage film filtering device (7), a third-stage intermediate water tank (8), a third water pump (9) and a full-automatic fiber bundle filtering device (10) which are sequentially connected, wherein a reverse flushing water outlet of the full-automatic fiber bundle filtering device (10) is connected with the second-stage intermediate water tank (5), a water outlet of the full-automatic fiber bundle filtering device (10) is connected with a fourth-stage intermediate water tank (11), the fourth-stage intermediate water tank (11) is connected with a water cooling system through a fourth water pump, the fourth-stage intermediate water tank (11) is connected with an adjusting tank (13) through a fifth water pump (12), an aeration system (14) is arranged in the adjusting tank (13), the adjusting tank (13) is connected with a storage tank (15) through an ultrafiltration automatic nanofiltration water making device, and the ultrafiltration automatic water making device and the second-stage film filtering device (7) are both connected with a sewage treatment system (16);
the ultrafiltration automatic water production device of the ultrafiltration machine comprises an ultrafiltration device (17) and a nanofiltration device (18) which are connected in series, wherein the ultrafiltration device (17) is connected with an adjusting tank (13) through a sixth water pump, the nanofiltration device (18) is connected with a storage tank (15), and a sewage discharge outlet of the ultrafiltration device (17) and a sewage discharge outlet of the nanofiltration device (18) are both connected with a sewage treatment system (16);
the sewage treatment system (16) is connected with a washing water tank (19) through a pressure filtration device (20);
the full-automatic fiber bundle filtering device (10) adopts asymmetric fiber bundles as filtering materials, the upper ends of the asymmetric fiber bundles are loose free ends, and the lower ends of the asymmetric fiber bundles are bound together to form a continuous gradient density filter bed structure which is sparse at the upper part and dense at the lower part;
the full-automatic fiber bundle filtering device (10) adopts air-water combined backwashing.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105540813A (en) * | 2015-12-25 | 2016-05-04 | 广西华纳新材料科技有限公司 | Nano calcium carbonate filter pressing wastewater treatment method and equipment |
| CN107540161A (en) * | 2017-10-10 | 2018-01-05 | 河北宏顺旺吉环保科技有限公司 | High pure and ultra-fine modified calcium carbonate produces the processing method and processing system of waste water |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN203159368U (en) * | 2013-04-03 | 2013-08-28 | 中冶长天国际工程有限责任公司 | Wastewater treatment system for nano calcium carbonate production |
| CN205773402U (en) * | 2016-05-19 | 2016-12-07 | 连南瑶族自治县华信钙业有限公司 | The calcium carbonate production line of water circulation use |
| JP6735830B2 (en) * | 2016-08-08 | 2020-08-05 | オルガノ株式会社 | Membrane filtration method and membrane filtration system |
| CN106430737A (en) * | 2016-11-30 | 2017-02-22 | 中冶华天南京工程技术有限公司 | Low-permeability oilfield reinjection water treatment method |
| CN107555659A (en) * | 2017-09-30 | 2018-01-09 | 河南恒泰环保工程有限公司 | Emulsifying liquid waste water processing unit and its technique |
| CN109607921A (en) * | 2018-12-29 | 2019-04-12 | 江苏坤奕环境工程有限公司 | A kind of efficient percolate treating process |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105540813A (en) * | 2015-12-25 | 2016-05-04 | 广西华纳新材料科技有限公司 | Nano calcium carbonate filter pressing wastewater treatment method and equipment |
| CN107540161A (en) * | 2017-10-10 | 2018-01-05 | 河北宏顺旺吉环保科技有限公司 | High pure and ultra-fine modified calcium carbonate produces the processing method and processing system of waste water |
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