CN112661328A - Production press filtration water treatment process - Google Patents
Production press filtration water treatment process Download PDFInfo
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- CN112661328A CN112661328A CN202011361976.3A CN202011361976A CN112661328A CN 112661328 A CN112661328 A CN 112661328A CN 202011361976 A CN202011361976 A CN 202011361976A CN 112661328 A CN112661328 A CN 112661328A
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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 make the pH value of the product C 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, 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 H into a water cooling system for reprocessing, and pumping the, and (4) obtaining a product I, and treating the product j and the product I 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 press filtration water in production. 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 secondary intermediate water tank, stirring, adding acid or alkali to make product C pH 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 middle water pool of the four levels 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 production pressure filtration water treatment process, the system for realizing the process comprises a first-stage intermediate water tank, a first water pump, a first-stage membrane filtering device, a dissolved air flotation system and a second-stage intermediate water tank which are sequentially connected, the second water pump, second grade membrane filter equipment, pond in the middle of the tertiary, third water pump and full-automatic tow filter equipment, pond in the middle of the second grade is connected to full-automatic tow filter equipment's backwash water discharge port, pond in the middle of the fourth level is connected to full-automatic tow filter equipment's delivery port, pond in the middle of the fourth level passes through fourth water pump connection water cooling system, pond in the middle of the fourth level passes through fifth water pump connection equalizing basin, be equipped with aeration system in the equalizing basin, the equalizing basin is filtered automatic water making device through the ultrafilter and is connected the storage pond, ultrafilter is filtered 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 which is quickly separated out, long-time sedimentation waiting time is not needed, and continuous production is realized, so that the treatment efficiency of the filter pressing water is improved by more than 80%. 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 are scattered and swing along with the back flushing water flow to generate strong throwing drag force, 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 more than 95% of the impurity particles can be filtered after the impurity particles are treated by the full-automatic fiber bundle filtering device. 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 illustrated by 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 connected in sequence, 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 calcium carbonate manufacturers 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, 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 for nanofiltration of an ultrafiltration machine, and the automatic water production device for nanofiltration of the ultrafiltration machine and the secondary membrane filtering device 7 are both 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 JGM 40-750-23.
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. the product A is pumped to a first-stage membrane filtering device 3 through a first water pump 2 and separated to obtain concentrated calcium carbonate slurry and a product B, the calcium carbonate slurry is recycled 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 a full-automatic fiber bundle filtering device 10 through a water filtering pump, the full-automatic fiber bundle filtering device 10 can automatically perform back flushing and automatic filtering to obtain back flushing water and filtered water (namely a product G), the back flushing water flows back to a secondary intermediate water tank 5,
h. the product G enters a middle water tank 11 of the four levels 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, all the products I are subjected to aeration treatment 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 large 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, when filtering, filtered water passes through the full-automatic fiber bundle filtering device 10 from an upper conducting wire, and when backwashing is performed, backwashing water passes through the full-automatic fiber bundle filtering device 10 from the bottom to the top. 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 (8)
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 8.5-8.9 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. and (5) treating the product I to obtain treated water.
2. The production press filtration water treatment process according to claim 1, characterized in that: 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 the 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).
3. The production press filtration water treatment process according to claim 1, characterized in that: in the step d, the pH is 8.7.
4. The production press filtration water treatment process according to claim 1, characterized in that: the system for realizing the process comprises a first-stage intermediate water tank (1), a first water pump (2), a first-stage membrane filtering device (3), a dissolved air flotation system (4), a second-stage intermediate water tank (5), a second water pump (6), a second-stage membrane 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), and the adjusting tank (, the ultrafiltration automatic water production device and the secondary membrane filtration device (7) of the ultrafiltration machine are both connected with a sewage treatment system (16).
5. The production press filtration water treatment process according to claim 4, characterized in that: the automatic water making device for nanofiltration of the ultrafiltration machine is composed of 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).
6. The production press filtration water treatment process according to claim 1, characterized in that: the sewage treatment system (16) is connected with a washing water tank (19) through a pressure filtration device (20).
7. The production press filtration water treatment process according to claim 4, characterized in that: 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 and free ends, and the lower ends of the asymmetric fiber bundles are bound together to form a continuous gradient density filter bed structure with a loose upper part and a dense lower part.
8. The production press filtration water treatment process according to claim 7, characterized in that: the full-automatic fiber bundle filtering device (10) adopts air-water combined backwashing.
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