CN110563213B - Industrial wastewater zero discharge process - Google Patents
Industrial wastewater zero discharge process Download PDFInfo
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- 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
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- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/34—Treatment of water, waste water, or sewage with mechanical oscillations
- C02F1/36—Treatment of water, waste water, or sewage with mechanical oscillations ultrasonic vibrations
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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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
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- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
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- C02F2209/06—Controlling or monitoring parameters in water treatment pH
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- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/02—Softening water by precipitation of the hardness
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- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/02—Softening water by precipitation of the hardness
- C02F5/06—Softening water by precipitation of the hardness using calcium compounds
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Abstract
The invention discloses an industrial wastewater zero discharge process, which belongs to the field of wastewater treatment, wherein industrial wastewater is fully mixed and stirred with Ca (OH)2, Na2SO4 and FeCl3 in sequence through a softening clarification kettle, the industrial wastewater is completely softened, the softened wastewater is precipitated through a precipitation tank to remove solid impurities in the wastewater, a composite superfine fiber filtering membrane is arranged at an outlet of a third precipitation tank, the composite superfine fiber filtering membrane at least comprises a layer of sea-island fiber non-woven membrane, the thickness of the sea-island fiber non-woven membrane is 0.1-0.3mm, the island component is PTFE, the sea component is PE, the island number of each sea-island fiber is 124, and the specification of the sea-island fiber is 0.1-0.15 dtex; and separating pure water from concentrated water by the precipitated wastewater through a reverse osmosis device. The invention has the beneficial effects that: the method removes high-salt impurities in the wastewater by three steps of softening, precipitation and reverse osmosis, and has the characteristics of convenient operation, low cost, high efficiency and the like. And the sea-island fiber composite material is adopted in the sedimentation tank for filtration, so that tiny particles in the wastewater can be effectively removed.
Description
Technical Field
The invention relates to the field of wastewater treatment, in particular to an industrial wastewater zero-discharge process.
Background
At the present stage, China is facing to the serious problem of water resource shortage, and in order to save water resources, China puts forward higher requirements on industrial wastewater treatment. The zero-emission concept is applied to the research of the industrial wastewater treatment technology, and the development and the progress of the industrial wastewater treatment technology are promoted, so that the extensive production mode in the wastewater treatment work in the industrial field is thoroughly changed, and the effective treatment of water resource pollution is realized. At present, more and more enterprises begin to take the zero discharge concept as guidance to correspondingly research and develop the wastewater treatment technology, so that more and more efficient wastewater treatment technologies are continuously brought forward, the wastewater treatment efficiency is remarkably improved, and the method plays a great positive role in environmental protection in China.
The invention patent application with publication number CN110282774A discloses a zero-emission treatment process and equipment for pickling wastewater in stainless steel production, which comprises the steps of a) preparing a precipitator, b) pretreating the pickling wastewater, c) oxidizing and neutralizing, d) pre-pressing, e) primary neutralizing, f) primary precipitation, g) secondary neutralizing and precipitating, and the like.
Disclosure of Invention
In order to solve the problems of the prior art that only some simple wastewater can be removed, the cost for removing high-salinity wastewater is high, the process is complex, the removal effect is poor, and secondary pollution is easily caused, the invention provides an industrial wastewater zero-discharge process, which sequentially comprises the following steps:
the method comprises the following steps: the industrial wastewater is passed through a softening and clarifying kettle, and then fully mixed with Ca (OH)2, Na2SO4 and FeCl3, and stirred to be fully softened, wherein the softening and clarifying kettle comprises more than two softening kettles, Ca (OH)2 is introduced into the first softening kettle, the pH value is controlled to be 9-10, and the stirring speed is 300 r/min;
step two: precipitating the softened wastewater in a sedimentation tank to remove solid impurities in the wastewater, wherein the sedimentation tank comprises a first sedimentation tank, a second sedimentation tank and a third sedimentation tank, a composite superfine fiber filtering membrane is arranged at an outlet of the third sedimentation tank, the composite superfine fiber filtering membrane at least comprises a layer of sea-island fiber non-woven membrane, the thickness of the sea-island fiber non-woven membrane is 0.1-0.3mm, the island component of the sea-island fiber non-woven membrane is PTFE, the sea component of the sea-island fiber non-woven membrane is PE, the island number of each sea-island fiber is 124, and the specification of the sea-island fiber is 0.1-0.15 dtex;
step three: and separating pure water from concentrated water by the precipitated wastewater through a reverse osmosis device.
The method removes high-salt impurities in the wastewater by three steps of softening, precipitation and reverse osmosis, and has the characteristics of convenient operation, low cost, high efficiency and the like. And the sea-island fiber composite material is adopted in the sedimentation tank for filtration, so that tiny particles in the wastewater can be effectively removed.
Furthermore, the composite superfine fiber filtering membrane consists of PPS fiber base cloth and island fiber non-woven films attached to the PPS fiber base cloth, the thickness of the PPS fiber base cloth is 1.0-1.2cm, the specification of PPS fibers is 1.5D 51mm, and the PPS fiber base cloth is positioned on one side close to the third sedimentation tank.
The PPS fiber base cloth is compounded with the composite superfine fiber filtering membrane, the PPS fiber base cloth is used as a framework, a good reinforcing effect can be achieved on the superfine fiber filtering membrane, the size stability of the superfine fiber filtering membrane is effectively kept, and the PPS fiber and the island fiber non-woven membrane form a gradient filtering effect, namely the PPS fiber base cloth can block large particles passing through, the filtering pressure of the island fiber non-woven membrane is reduced, and better function division is achieved.
The sea-island fiber non-woven film is adopted, the specification of the sea-island fiber is 0.1-0.15dtex, so that the pore diameter is small enough, and the filtering efficiency of the film on tiny particles is greatly improved.
Further, the softening and clarifying kettle also comprises a second softening kettle which is arranged at the outlet of the first softening kettle and is internally filled with Ca (OH)2, Na2SO4 and FeCl3, wherein the molar ratio of Ca (OH)2, Na2SO4 and FeCl3 is controlled to be 2: 5: 3.
further, the outer circumferential surface of the second softening kettle is also provided with an ultrasonic generator which continuously applies ultrasonic waves with the frequency of 32.4kHz to the inside of the second softening kettle.
Further, the softening and clarifying kettle also comprises a third softening kettle, wherein the third softening kettle is arranged at the outlet of the second softening kettle, FeCl3 is filled in the third softening kettle, and the stirring speed is 500 r/min.
Sectional type precipitation is adopted, ultrasonic precipitation is adopted in the second step of precipitation, the reaction efficiency of high-salt ions, Ca (OH)2, Na2SO4 and FeCl3 in the wastewater can be improved, and generated solid particles can be effectively prevented from being aggregated into clusters.
Further, a first filter screen is arranged between the first sedimentation tank and the second sedimentation tank, a second filter screen is arranged between the second sedimentation tank and the third sedimentation tank, the first filter screen is a metal filter screen, the thickness of the first filter screen is 1.5cm, the diameter of a pore is 1.5-3.5mm, and the second filter screen is spunlace polyester fiber cloth, and the thickness of the second filter screen is 0.8-1.0 cm.
Compared with the prior art, the invention has the beneficial effects that:
(1) the method removes high-salt impurities in the wastewater by three steps of softening, precipitation and reverse osmosis, and has the characteristics of convenient operation, low cost, high efficiency and the like. And the sea-island fiber composite material is adopted in the sedimentation tank for filtration, so that tiny particles in the wastewater can be effectively removed.
(2) The PPS fiber base cloth is compounded with the composite superfine fiber filtering membrane, the PPS fiber base cloth is used as a framework, a good reinforcing effect can be achieved on the superfine fiber filtering membrane, the size stability of the superfine fiber filtering membrane is effectively kept, and the PPS fiber and the island fiber non-woven membrane form a gradient filtering effect, namely the PPS fiber base cloth can block large particles passing through, the filtering pressure of the island fiber non-woven membrane is reduced, and better function division is achieved.
(3) Sectional type precipitation is adopted, ultrasonic precipitation is adopted in the second step of precipitation, the reaction efficiency of high-salt ions, Ca (OH)2, Na2SO4 and FeCl3 in the wastewater can be improved, and generated solid particles can be effectively prevented from being aggregated into clusters.
Detailed Description
The present invention will be described in further detail with reference to examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The industrial wastewater zero-discharge process sequentially comprises the following steps:
the method comprises the following steps: the industrial wastewater is passed through a softening and clarifying kettle, and then fully mixed with Ca (OH)2, Na2SO4 and FeCl3, and stirred to be fully softened, wherein the softening and clarifying kettle comprises more than two softening kettles, Ca (OH)2 is introduced into the first softening kettle, the pH value is controlled to be 9-10, and the stirring speed is 300 r/min;
step two: precipitating the softened wastewater in a sedimentation tank to remove solid impurities in the wastewater, wherein the sedimentation tank comprises a first sedimentation tank, a second sedimentation tank and a third sedimentation tank, a composite superfine fiber filtering membrane is arranged at an outlet of the third sedimentation tank, the composite superfine fiber filtering membrane at least comprises a layer of sea-island fiber non-woven membrane, the thickness of the sea-island fiber non-woven membrane is 0.1-0.3mm, the island component of the sea-island fiber non-woven membrane is PTFE, the sea component of the sea-island fiber non-woven membrane is PE, the island number of each sea-island fiber is 124, and the specification of the sea-island fiber is 0.1-0.15 dtex;
step three: and separating pure water from concentrated water by the precipitated wastewater through a reverse osmosis device.
The method removes high-salt impurities in the wastewater by three steps of softening, precipitation and reverse osmosis, and has the characteristics of convenient operation, low cost, high efficiency and the like. And the sea-island fiber composite material is adopted in the sedimentation tank for filtration, so that tiny particles in the wastewater can be effectively removed.
In a preferred embodiment, the composite ultrafine fiber filtering membrane is composed of a PPS fiber base cloth and a sea-island fiber non-woven film attached thereto, the thickness of the PPS fiber base cloth is 1.0-1.2cm, the PPS fiber is 1.5D by 51mm, and the PPS fiber base cloth is positioned on the side close to the third sedimentation tank.
The PPS fiber base cloth is compounded with the composite superfine fiber filtering membrane, the PPS fiber base cloth is used as a framework, a good reinforcing effect can be achieved on the superfine fiber filtering membrane, the size stability of the superfine fiber filtering membrane is effectively kept, and the PPS fiber and the island fiber non-woven membrane form a gradient filtering effect, namely the PPS fiber base cloth can block large particles passing through, the filtering pressure of the island fiber non-woven membrane is reduced, and better function division is achieved.
The sea-island fiber non-woven film is adopted, the specification of the sea-island fiber is 0.1-0.15dtex, so that the pore diameter is small enough, and the filtering efficiency of the film on tiny particles is greatly improved.
As a preferred embodiment, the softening and clarifying tank further comprises a second softening tank, which is arranged at the outlet of the first softening tank and is filled with ca (oh)2, Na2SO4 and FeCl3, wherein the molar ratio of ca (oh)2, Na2SO4 and FeCl3 is controlled to be 2: 5: 3.
in a preferred embodiment, the outer circumferential surface of the second softening kettle is further provided with an ultrasonic generator, and ultrasonic waves with the frequency of 32.4kHz continuously act on the inside of the second softening kettle.
In a preferred embodiment, the softening and clarifying kettle further comprises a third softening kettle, the third softening kettle is arranged at the outlet of the second softening kettle, FeCl3 is filled in the third softening kettle, and the stirring speed is 500 r/min.
Sectional type precipitation is adopted, ultrasonic precipitation is adopted in the second step of precipitation, the reaction efficiency of high-salt ions, Ca (OH)2, Na2SO4 and FeCl3 in the wastewater can be improved, and generated solid particles can be effectively prevented from being aggregated into clusters.
As a preferable embodiment, a first filter screen is arranged between the first sedimentation tank and the second sedimentation tank, a second filter screen is arranged between the second sedimentation tank and the third sedimentation tank, the first filter screen is a metal filter screen with the thickness of 1.5cm and the pore diameter of 1.5-3.5mm, and the second filter screen is spunlace polyester fiber cloth with the thickness of 0.8-1.0 cm.
The advantages and technical effects of the embodiments of the present invention are specifically described below by implementing several sets of examples and comparative examples:
the first embodiment is as follows:
the industrial wastewater zero-discharge process sequentially comprises the following steps:
the method comprises the following steps: the industrial wastewater is passed through a softening and clarifying kettle, and then fully mixed with Ca (OH)2, Na2SO4 and FeCl3, and stirred to be fully softened, wherein the softening and clarifying kettle comprises more than two softening kettles, Ca (OH)2 is introduced into the first softening kettle, the pH value is controlled to be 9-10, and the stirring speed is 300 r/min;
the softening and clarifying kettle also comprises a second softening kettle which is arranged at the outlet of the first softening kettle and is internally filled with Ca (OH)2, Na2SO4 and FeCl3, wherein the molar ratio of Ca (OH)2, Na2SO4 and FeCl3 is controlled to be 2: 5: 3. and the outer circumferential surface of the second softening kettle is also provided with an ultrasonic generator which continuously applies ultrasonic waves with the frequency of 32.4kHz to the inside of the second softening kettle. The softening and clarifying kettle further comprises a third softening kettle, the third softening kettle is arranged at the outlet of the second softening kettle, FeCl3 is filled in the third softening kettle, and the stirring speed is 500 r/min.
Step two: precipitating the softened wastewater by a sedimentation tank to remove solid impurities in the wastewater, wherein the sedimentation tank comprises a first sedimentation tank, a second sedimentation tank and a third sedimentation tank, a composite superfine fiber filtering membrane is arranged at an outlet of the third sedimentation tank, the composite superfine fiber filtering membrane at least comprises a layer of sea-island fiber non-woven membrane, the thickness of the sea-island fiber non-woven membrane is 0.3mm, the island component of the sea-island fiber non-woven membrane is PTFE, the sea component is PE, the island number of each sea-island fiber is 124, and the specification of the sea-island fiber is 0.1 dtex; the composite superfine fiber filtering membrane consists of PPS fiber base cloth and a sea island fiber non-woven film attached to the PPS fiber base cloth, the thickness of the PPS fiber base cloth is 1.2cm, the specification of PPS fibers is 1.5D 51mm, and the PPS fiber base cloth is positioned on one side close to the third sedimentation tank.
Be equipped with first filter screen between first sedimentation tank and the second sedimentation tank, the second sedimentation tank with be equipped with the second filter screen between the third sedimentation tank, first filter screen is metal filter screen, and its thickness is 1.5cm, and the pore diameter is 2.0mm, the second filter screen is water thorn polyester fiber cloth, and its thickness is 1.0 cm.
Step three: and separating pure water from concentrated water by the precipitated wastewater through a reverse osmosis device.
Example two:
the industrial wastewater zero-discharge process sequentially comprises the following steps:
the method comprises the following steps: the industrial wastewater is passed through a softening and clarifying kettle, and then fully mixed with Ca (OH)2, Na2SO4 and FeCl3, and stirred to be fully softened, wherein the softening and clarifying kettle comprises more than two softening kettles, Ca (OH)2 is introduced into the first softening kettle, the pH value is controlled to be 9-10, and the stirring speed is 300 r/min; the softening and clarifying kettle also comprises a second softening kettle which is arranged at the outlet of the first softening kettle and is internally filled with Ca (OH)2, Na2SO4 and FeCl3, wherein the molar ratio of Ca (OH)2, Na2SO4 and FeCl3 is controlled to be 2: 5: 3.
the outer circumferential surface of the second softening kettle is also provided with an ultrasonic generator which continuously applies ultrasonic waves with the frequency of 32.4kHz to the interior of the second softening kettle. The softening and clarifying kettle further comprises a third softening kettle, the third softening kettle is arranged at the outlet of the second softening kettle, FeCl3 is filled in the third softening kettle, and the stirring speed is 500 r/min.
Step two: precipitating the softened wastewater by a sedimentation tank to remove solid impurities in the wastewater, wherein the sedimentation tank comprises a first sedimentation tank, a second sedimentation tank and a third sedimentation tank, a composite superfine fiber filtering membrane is arranged at an outlet of the third sedimentation tank, the composite superfine fiber filtering membrane at least comprises a layer of sea-island fiber non-woven membrane, the thickness of the sea-island fiber non-woven membrane is 0.1mm, the island component of the sea-island fiber non-woven membrane is PTFE, the sea component is PE, the island number of each sea-island fiber is 124, and the specification of the sea-island fiber is 0.15 dtex; the composite superfine fiber filtering membrane consists of PPS fiber base cloth and a sea island fiber non-woven film attached to the PPS fiber base cloth, the thickness of the PPS fiber base cloth is 1.0cm, the specification of PPS fibers is 1.5D 51mm, and the PPS fiber base cloth is positioned on one side close to the third sedimentation tank.
Be equipped with first filter screen between first sedimentation tank and the second sedimentation tank, the second sedimentation tank with be equipped with the second filter screen between the third sedimentation tank, first filter screen is metal filter screen, and its thickness is 1.5cm, and the pore diameter is 2.5mm, the second filter screen is water thorn polyester fiber cloth, and its thickness is 0.9 cm.
Step three: and separating pure water from concentrated water by the precipitated wastewater through a reverse osmosis device.
Comparative example one:
the industrial wastewater zero-discharge process sequentially comprises the following steps:
the method comprises the following steps: the industrial wastewater is passed through a softening and clarifying kettle, and then fully mixed with Ca (OH)2, Na2SO4 and FeCl3, and stirred to be fully softened, wherein the softening and clarifying kettle comprises more than two softening kettles, Ca (OH)2 is introduced into the first softening kettle, the pH value is controlled to be 9-10, and the stirring speed is 300 r/min;
the softening and clarifying kettle also comprises a second softening kettle which is arranged at the outlet of the first softening kettle and is internally filled with Ca (OH)2, Na2SO4 and FeCl3, wherein the molar ratio of Ca (OH)2, Na2SO4 and FeCl3 is controlled to be 2: 5: 3. the softening and clarifying kettle also comprises a third softening kettle which is arranged at the outlet of the second softening kettle, FeCl3 is filled in the third softening kettle, and the stirring speed is 500 r/min;
step two: precipitating the softened wastewater by a sedimentation tank to remove solid impurities in the wastewater, wherein the sedimentation tank comprises a first sedimentation tank, a second sedimentation tank and a third sedimentation tank, a composite superfine fiber filtering membrane is arranged at an outlet of the third sedimentation tank, the composite superfine fiber filtering membrane at least comprises a layer of sea-island fiber non-woven membrane, the thickness of the sea-island fiber non-woven membrane is 0.3mm, the island component of the sea-island fiber non-woven membrane is PTFE, the sea component is PE, the island number of each sea-island fiber is 124, and the specification of the sea-island fiber is 0.1 dtex; the composite superfine fiber filtering membrane consists of PPS fiber base cloth and a sea island fiber non-woven film attached to the PPS fiber base cloth, the thickness of the PPS fiber base cloth is 1.2cm, the specification of PPS fibers is 1.5D 51mm, and the PPS fiber base cloth is positioned on one side close to the third sedimentation tank.
Be equipped with first filter screen between first sedimentation tank and the second sedimentation tank, the second sedimentation tank with be equipped with the second filter screen between the third sedimentation tank, first filter screen is metal filter screen, and its thickness is 1.5cm, and the pore diameter is 2.0mm, the second filter screen is water thorn polyester fiber cloth, and its thickness is 1.0 cm.
Step three: and separating pure water from concentrated water by the precipitated wastewater through a reverse osmosis device.
Comparative example two:
the industrial wastewater zero-discharge process sequentially comprises the following steps:
the method comprises the following steps: the industrial wastewater is passed through a softening and clarifying kettle, and then fully mixed with Ca (OH)2, Na2SO4 and FeCl3, and stirred to be fully softened, wherein the softening and clarifying kettle comprises more than two softening kettles, Ca (OH)2 is introduced into the first softening kettle, the pH value is controlled to be 9-10, and the stirring speed is 300 r/min;
the softening and clarifying kettle also comprises a second softening kettle which is arranged at the outlet of the first softening kettle and is internally filled with Ca (OH)2, Na2SO4 and FeCl3, wherein the molar ratio of Ca (OH)2, Na2SO4 and FeCl3 is controlled to be 2: 5: 3. and the outer circumferential surface of the second softening kettle is also provided with an ultrasonic generator which continuously applies ultrasonic waves with the frequency of 32.4kHz to the inside of the second softening kettle. The softening and clarifying kettle further comprises a third softening kettle, the third softening kettle is arranged at the outlet of the second softening kettle, FeCl3 is filled in the third softening kettle, and the stirring speed is 500 r/min.
Step two: the softened wastewater is precipitated through a precipitation tank to remove solid impurities in the wastewater, and a layer of polypropylene film is arranged at an outlet of the precipitation tank and has the thickness of 0.3 mm.
Step three: and separating pure water from concentrated water by the precipitated wastewater through a reverse osmosis device.
Comparative example three:
the industrial wastewater zero-discharge process sequentially comprises the following steps:
the method comprises the following steps: the industrial wastewater is passed through a softening and clarifying kettle, and then fully mixed with Ca (OH)2, Na2SO4 and FeCl3, and stirred to be fully softened, wherein the softening and clarifying kettle comprises more than two softening kettles, Ca (OH)2 is introduced into the first softening kettle, the pH value is controlled to be 9-10, and the stirring speed is 300 r/min;
the softening and clarifying kettle also comprises a second softening kettle which is arranged at the outlet of the first softening kettle and is internally filled with Ca (OH)2, Na2SO4 and FeCl3, wherein the molar ratio of Ca (OH)2, Na2SO4 and FeCl3 is controlled to be 2: 5: 3. and the outer circumferential surface of the second softening kettle is also provided with an ultrasonic generator which continuously applies ultrasonic waves with the frequency of 32.4kHz to the inside of the second softening kettle. The softening and clarifying kettle further comprises a third softening kettle, the third softening kettle is arranged at the outlet of the second softening kettle, FeCl3 is filled in the third softening kettle, and the stirring speed is 500 r/min.
Step two: precipitating the softened wastewater in a sedimentation tank to remove solid impurities in the wastewater, wherein a composite superfine fiber filtering membrane is arranged at an outlet of the sedimentation tank, the composite superfine fiber filtering membrane at least comprises a layer of sea-island fiber non-woven membrane, the thickness of the sea-island fiber non-woven membrane is 0.3mm, the island component of the sea-island fiber non-woven membrane is PTFE, the sea component is PE, the island number of each sea-island fiber is 124, and the specification of the sea-island fiber is 0.1 dtex; the composite superfine fiber filtering membrane consists of PPS fiber base cloth and a sea island fiber non-woven film attached to the PPS fiber base cloth, the thickness of the PPS fiber base cloth is 1.2cm, the specification of PPS fibers is 1.5D 51mm, and the PPS fiber base cloth is positioned on one side close to the sedimentation tank.
Step three: and separating pure water from concentrated water by the precipitated wastewater through a reverse osmosis device.
Tests show that by adopting the discharge process, 25 tons of wastewater can be treated every day, the recovery rate of the wastewater reaches 93 percent, and the water quality of the discharged wastewater is as follows (unit: mg/L):
| item | TOC concentration | NH4 +Concentration of | TN concentration | SO4 2-Concentration of | Cl-Concentration of | Na + concentration | Ca2+Concentration of | Concentration of insoluble matter |
| Example one | 67 | 12 | 103 | 1682 | 14233 | 18260 | 3 | 13 |
| Example two | 72 | 17 | 126 | 1794 | 14382 | 17659 | 5 | 15 |
| Comparative example 1 | 102 | 42 | 167 | 2173 | 18271 | 24769 | 8 | 58 |
| Comparative example No. two | 95 | 36 | 176 | 2364 | 18523 | 23466 | 6 | 93 |
| Comparative example No. three | 83 | 21 | 149 | 1864 | 17584 | 19438 | 5 | 36 |
As can be seen from the experimental data, the quality of the wastewater obtained by the embodiment is better than that of the comparative example, the recovery rate of the wastewater is high, and the treatment capacity of the wastewater is strong.
While the foregoing description shows and describes the preferred embodiments of the present invention, it is to be understood that the invention is not limited to the forms disclosed herein, but is not to be construed as excluding other embodiments and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as described herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (1)
1. The industrial wastewater zero-discharge process is characterized by sequentially comprising the following steps of:
the method comprises the following steps: passing the industrial wastewater through a softening and clarifying kettle, and then sequentially reacting with Ca (OH)2、Na2SO4、FeCl3Mixing thoroughly, stirring, and softening completely, wherein the softening and clarifying kettle comprises two or more softening kettles, the first softening kettle is filled with Ca (OH)2Controlling the pH value to be 9-10, and stirring at the speed of 300 r/min;
the softening and clarifying kettle also comprises a second softening kettle which is arranged at the outlet of the first softening kettle,
wherein Ca (OH) is introduced2、Na2SO4、FeCl3Control of Ca (OH) therein2、Na2SO4、FeCl3In a molar ratio of 2: 5: 3; the outer circumferential surface of the second softening kettle is also provided with an ultrasonic generator, and the second softening kettle is internally provided with a water inlet pipeUltrasonic wave with continuous action frequency of 32.4 kHz; the softening and clarifying kettle further comprises a third softening kettle, the third softening kettle is arranged at the outlet of the second softening kettle, and FeCl is introduced into the third softening kettle3The stirring speed is 500 r/min;
step two: precipitating the softened wastewater by a sedimentation tank to remove solid impurities in the wastewater, wherein the sedimentation tank comprises a first sedimentation tank, a second sedimentation tank and a third sedimentation tank, a composite superfine fiber filtering membrane is arranged at an outlet of the third sedimentation tank, the composite superfine fiber filtering membrane at least comprises a layer of sea-island fiber non-woven membrane, the thickness of the sea-island fiber non-woven membrane is 0.3mm, the island component of the sea-island fiber non-woven membrane is PTFE, the sea component is PE, the island number of each sea-island fiber is 124, and the specification of the sea-island fiber is 0.1 dtex; the composite superfine fiber filtering membrane consists of PPS fiber base cloth and a sea island fiber non-woven film attached to the PPS fiber base cloth, the thickness of the PPS fiber base cloth is 1.2cm, the specification of PPS fibers is 1.5D 51mm, and the PPS fiber base cloth is positioned on one side close to the third sedimentation tank;
a first filter screen is arranged between the first sedimentation tank and the second sedimentation tank, and the second sedimentation tank and the third sedimentation tank
A second filter screen is arranged between the tanks, the first filter screen is a metal filter screen, the thickness of the first filter screen is 1.5cm, the diameter of a pore is 2.0mm, and the second filter screen is spunlace polyester fiber cloth, and the thickness of the second filter screen is 1.0 cm;
step three: and separating pure water from concentrated water by the precipitated wastewater through a reverse osmosis device.
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