CN111747558A - System for continuously purifying sewage by using gas - Google Patents

System for continuously purifying sewage by using gas Download PDF

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Publication number
CN111747558A
CN111747558A CN201910250367.1A CN201910250367A CN111747558A CN 111747558 A CN111747558 A CN 111747558A CN 201910250367 A CN201910250367 A CN 201910250367A CN 111747558 A CN111747558 A CN 111747558A
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CN
China
Prior art keywords
sewage
venturi mixer
gas
efficiency reactor
outlet
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CN201910250367.1A
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Chinese (zh)
Inventor
胥永
余磊
邓爱民
曾芳成
王召启
刘涛
余智艳
邓磊
彭宏道
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China Nerin Engineering Co Ltd
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China Nerin Engineering Co Ltd
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Application filed by China Nerin Engineering Co Ltd filed Critical China Nerin Engineering Co Ltd
Priority to CN201910250367.1A priority Critical patent/CN111747558A/en
Priority claimed from PCT/CN2019/093384 external-priority patent/WO2020199382A1/en
Publication of CN111747558A publication Critical patent/CN111747558A/en
Pending legal-status Critical Current

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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/58Treatment of water, waste water, or sewage by removing specified dissolved compounds
    • C02F1/62Heavy metal compounds
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/72Treatment of water, waste water, or sewage by oxidation
    • C02F1/78Treatment of water, waste water, or sewage by oxidation with ozone
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00Nature of the contaminant
    • C02F2101/10Inorganic compounds
    • C02F2101/20Heavy metals or heavy metal compounds
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2201/00Apparatus for treatment of water, waste water or sewage
    • C02F2201/002Construction details of the apparatus
    • C02F2201/007Modular design

Abstract

The invention discloses a system for continuously purifying sewage by using purified gas, which comprises: the system comprises a sewage tank, a sewage delivery pump, a static mixer, a first Venturi mixer, a second Venturi mixer, a high-efficiency reactor and a liquid-solid separation device, wherein the static mixer is connected with the sewage delivery pump through two pipelines; the first Venturi mixer and the second Venturi mixer are respectively arranged on the two pipelines, and the first Venturi mixer and the second Venturi mixer are provided with purified gas suction ports; the high-efficiency reactor is provided with a sewage inlet, an overflow outlet and a purified gas outlet, the sewage inlet is connected with the static mixer, and an overflow pipe extending into the high-efficiency reactor is arranged in the overflow outlet; the liquid-solid separation device is provided with a reacted sewage inlet, a precipitation outlet and a purified sewage outlet, and the reacted sewage inlet is connected with the overflow outlet. The system can realize continuous treatment of the waste liquid and has the advantages of simple flow, convenient operation, high treatment efficiency and high safety.

Description

System for continuously purifying sewage by using gas
Technical Field
The invention belongs to the field of sewage heavy metal treatment, and particularly relates to a system for continuously purifying sewage by using purified gas.
Background
Since the 21 st century, the smelting and chemical industries in China are rapidly developed, the generated pollutants are increased, and waste liquid containing heavy metal ions such as copper and arsenic generated in the production process is a large pollution source. Traditionally using Na2S is used as a vulcanizing agent to carry out removal treatment on the copper-containing and arsenic-containing plasma waste liquid. To reduce sodium ion enrichment in the system, more and more H has been used in recent years2S is substituted for Na2And S. Tradition Na2S as vulcanizing agent and in recent years H2The treatment of the waste liquid by using S as a vulcanizing agent is mostly a discontinuous vulcanization reaction process. The individual continuous vulcanization process has the disadvantages of complicated process device, high cost and the like, and H2S is a highly toxic gas, to effect H2The S is used as a vulcanizing agent to carry out the continuous sulfuration and dearsenification of the waste liquid, the equipment is simple, the flow is simple, the operation is convenient, and the reaction efficiency, the safety and the H are improved2The utilization rate of S is becoming a research hotspot.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, an object of the present invention is to provide a system for continuously purifying sewage by using purified gas, which can continuously treat waste liquid and has the advantages of simple process, convenient operation, high treatment efficiency and high safety.
According to an aspect of the invention, the invention proposes a system for continuous purification of contaminated water with a purified gas, according to an embodiment of the invention, the system comprising:
a sewage tank;
the sewage conveying pump is connected with the sewage tank;
the static mixer is connected with the sewage delivery pump through two pipelines;
a first venturi mixer and a second venturi mixer, the first venturi mixer and the second venturi mixer being disposed on the two pipes, respectively, the first venturi mixer and the second venturi mixer having purge gas suction ports;
the high-efficiency reactor is provided with a sewage inlet, an overflow outlet and a purified gas outlet, the sewage inlet is connected with the static mixer, and an overflow pipe extending into the high-efficiency reactor is arranged in the overflow outlet;
the liquid-solid separation device is provided with a reacted sewage inlet, a precipitation outlet and a purified sewage outlet, and the reacted sewage inlet is connected with the overflow outlet.
Therefore, the sewage in the sewage tank is conveyed to the high-efficiency reactor in two ways by the sewage conveying pump, the first Venturi mixer and the second Venturi mixer are respectively arranged on the two ways of pipelines, the static mixer is arranged on the main pipe after the two ways of pipelines are converged, and negative pressure is formed at the suction cavity of the first Venturi mixer and the second Venturi mixer to suck purified gas. The mixed gas enters a static mixer for further mixing reaction through high-speed mixing reaction of a throat pipe of the first Venturi mixer and a throat pipe of the second Venturi mixer and deceleration pressurization of a Venturi diffusion pipe, and then enters the high-efficiency reactor. The purified gas is further fully reacted with heavy metals in the sewage in the high-efficiency reactor, and the sewage after the reaction continuously overflows and is sent to liquid-solid separation to obtain the purified sewage. Therefore, the invention skillfully utilizes the Venturi mixer to effectively mix the purified gas into the sewage, and the purified gas introduced by the system can be fully mixed into the sewage and reacts with heavy metal ions in the sewage to generate precipitation, thereby obviously improving the purification efficiency. Moreover, the system can realize continuous removal of heavy metal ions in sewage, and has the advantages of simple flow, simple equipment and reduced cost.
In addition, the system for continuously purifying sewage by using purified gas according to the above embodiment of the present invention may further have the following additional technical features:
in some embodiments of the invention, the system further comprises: a high efficiency reactor circulation pump having a circulation fluid outlet and a circulation fluid inlet, the high efficiency reactor circulation pump disposed between the circulation fluid outlet and the circulation fluid inlet; and the third Venturi mixer is arranged between the circulating pump of the high-efficiency reactor and the circulating liquid inlet, and is connected with the purified gas storage tank. Therefore, the liquid-solid mixture at the bottom of the high-efficiency reactor is further extracted and returned to the high-efficiency reactor, and the returned pipeline is further supplemented with purified gas by arranging a third Venturi mixer, so that heavy metal ions and the like in the sewage are fully reacted to form precipitates and are removed.
In some embodiments of the present invention, the system for continuously purifying sewage with purified gas of the above embodiments further comprises: the intermediate tank is internally provided with a stirrer or a circulating pump and is arranged between the overflow outlet of the high-efficiency reactor and the liquid-solid separation device.
In some embodiments of the invention, the first venturi mixer is connected to the top gas outlet of the intermediate tank and the purge gas outlet of the high efficiency reactor, respectively, for recovering the purge gas.
In some embodiments of the invention, the recycle inlet on the high efficiency reactor sidewall is tangential to the high efficiency reactor sidewall; or the circulating liquid inlet is arranged along the diameter direction of the high-efficiency reactor.
In some embodiments of the present invention, the circulating liquid inlet comprises a plurality of circulating liquid inlets, and the plurality of circulating liquid inlets are arranged on the side wall of the high-efficiency reactor at intervals along the height direction.
In some embodiments of the invention, the recycle liquid inlet is below the liquid level in the high efficiency reactor.
In some embodiments of the invention, the first venturi mixer, the second venturi mixer, and the third venturi mixer each have at least two purge gas intake ports.
Drawings
Fig. 1 is a schematic configuration diagram of a system for continuously purifying sewage using purified gas according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
According to a first aspect of the invention, the invention proposes a system for continuous purification of contaminated water with a purification gas. The system of the present invention is described in detail below.
According to a specific embodiment of the present invention, the system for continuously purifying contaminated water using a purification gas comprises: sewage tank 100, sewage delivery pump 200, static mixer 300, first venturi mixer 400, second venturi mixer 500, high-efficient reactor 600, liquid-solid separator 700, high-efficient reactor circulating pump 800, third venturi mixer 900. Wherein the sewage transfer pump 200 is connected with the sewage tank 100; the static mixer 300 is connected with the sewage delivery pump 200 through two pipelines; the first venturi mixer 400 and the second venturi mixer 500 are respectively disposed on the two pipes; the high-efficiency reactor 600 is provided with a sewage inlet 610, an overflow outlet 620, a circulating liquid outlet 630, a circulating liquid inlet 640 and a purified gas outlet 650, the high-efficiency reactor 600 is connected with the static mixer 300, and an overflow pipe 660 extending into the high-efficiency reactor 600 is arranged in the overflow outlet 620; the liquid-solid separating device 700 has a post-reaction sewage inlet 710, a precipitation outlet (not shown), and a purified sewage outlet 720, the post-reaction sewage inlet 710 being connected to the overflow outlet 610; the high efficiency reactor circulation pump 800 is disposed between the circulation fluid outlet 620 and the circulation fluid inlet 630; the third venturi mixer 900 is disposed between the high efficiency reactor circulation pump 800 and the circulation liquid inlet 630. Wherein the first venturi mixer 400 is connected to the purge gas outlet 640, and the second venturi mixer 500 and the third venturi mixer 900 are respectively connected to the purge gas storage tank a.
Therefore, the invention conveys the sewage containing heavy metal ions to the high-efficiency reactor in two paths through the sewage conveying pump, the first Venturi mixer and the second Venturi mixer are respectively arranged on the two paths of pipelines, the static mixer is arranged on the main pipe after the two paths are converged, and negative pressure is formed at the suction cavity of the first Venturi mixer and the second Venturi mixer to suck purified gas. The mixed gas enters a static mixer for further mixing reaction through high-speed mixing reaction of a throat pipe of the first Venturi mixer and a throat pipe of the second Venturi mixer and deceleration pressurization of a Venturi diffusion pipe, and then enters the high-efficiency reactor. The purified gas and the heavy metal in the sewage are further fully reacted in the high-efficiency reactor, and the sewage after the reaction continuously overflows and is sent to liquid-solid separation to obtain the purified sewage. Further, the liquid-solid mixture at the bottom of the high-efficiency reactor is pumped out and returned to the high-efficiency reactor, and the returned pipeline is provided with a third Venturi mixer to further supplement purified gas, so that heavy metal ions in the sewage fully react to form sulfide precipitates to be removed. Therefore, the invention skillfully utilizes the Venturi mixer to effectively mix the purified gas into the sewage, and the purified gas introduced by the system can be fully mixed into the sewage and reacts with the heavy metal to generate sulfide precipitation, thereby obviously improving the removal efficiency of the heavy metal. Moreover, the system can realize continuous removal of heavy metal ions in the sewage, and has the advantages of simple flow, simple equipment and reduced cost.
The system for continuously purifying sewage using purified gas according to the embodiment of the present invention will be described in detail.
Continuous purification with purge gas according to the above-described embodiment of the inventionThe sewage system is suitable for the treatment of domestic production water, surface water and acid sewage. In particular, it may be selected from H2S、O3、CO2And air as a purge gas. For example, CO may be utilized2Removing calcium from domestic and production water, and reducing hardness of domestic and production water; can utilize O3Sterilizing surface water; can utilize H2And S, removing heavy metal ions in the acidic sewage.
According to a particular embodiment of the invention, the above system is particularly suitable for the treatment of acid effluents containing heavy metals and uses hydrogen sulphide gas as the purge gas. Specifically, the concentration of heavy metals contained in the acidic wastewater may be As: 1-30 g/L, Cu: 0.1-10 g/L, Hg: 0.01-5 g/L, Cd: 0.01-5 g/L, Cr: 0.01-5 g/L. The acidic sewage can be heavy metal ion waste acid containing copper, arsenic and the like from a flue gas purification process of a sulfuric acid system. Thereby, use H2The S gas can carry out fluidization reaction with the heavy metal in the acidic sewage, and the produced fluidized precipitate is separated out, so that the aim of purification is fulfilled.
The system of the embodiment of the invention utilizes hydrogen sulfide gas to treat the acidic sewage containing heavy metal ions. Specifically, the system of the invention adopts a Venturi mixer to feed H into the acidic sewage2The S gas is obtained by forming negative pressure in a sealed Venturi mixer to make H gas2The S gas and the acidic sewage are fully mixed. Thereby not only increasing H2The mixing efficiency of S gas and H can be effectively avoided2S gas leaks.
To facilitate an understanding of the purification system of the above-described embodiment of the present invention, the following is given H2The purification of acidic wastewater containing heavy metals by S gas is exemplified.
According to an embodiment of the present invention, first, the above-described system includes a wastewater tank 100, a wastewater delivery pump 200, a static mixer 300, a first venturi mixer 400, a second venturi mixer 500, and a high efficiency reactor 600. Wherein the wastewater tank 100, the wastewater delivery pump 200, the static mixer 300 and the high efficiency reactor 600 are connected in sequence so as to facilitate the wastewater treatmentThe sewage in the tank 100 is finally conveyed into the high-efficiency reactor 600, and the sewage conveying pump 200 is connected with the static mixer 300 through two pipelines; and the first venturi mixer 400 and the second venturi mixer 500 are respectively provided on the two pipes. The invention just arranges two dune mixers on two pipelines, and uses the two dune mixers to introduce purified gas into sewage. Specifically, sewage with certain pressure (more than 0.05Mpa) passes through the Venturi mixer, negative pressure is formed in a suction cavity of the Venturi mixer, purified gas is sucked and mixed with the sewage, and heavy metals and the like in the sewage react with the purified gas to generate precipitates which are then separated. For example, in the case of purifying acidic wastewater containing heavy metal ions with hydrogen sulfide gas, the present invention uses a venturi mixer to introduce H into the acidic wastewater2Compared with the method of blowing H into the acidic sewage by using a fan2S gas method, effectively avoids H2There is a potential for leakage of S gas through the equipment.
In addition, the sewage is conveyed through two paths, and the first Venturi mixer and the second Venturi mixer are respectively arranged on the two paths of pipelines, so that the mixing point of purified gas is effectively increased, and the efficiency of the purified gas being mixed into the sewage is obviously improved. In addition, the invention skillfully utilizes the Venturi mixer to realize the mixing of purified gas and sewage in the sewage conveying process, thereby not only improving the mixing efficiency of the purified gas, but also realizing the continuous treatment of the sewage, and further obviously improving the sewage treatment efficiency.
According to the embodiment of the present invention, further, the first venturi mixer 400 and the second venturi mixer 500 are used to introduce the purified gas into the sewage, and further, the two paths of sewage are merged in the static mixer 300 before entering the high efficiency reactor 600. Therefore, the mixing degree of the sewage and the purified gas is further improved, and the reaction efficiency of the heavy metal is improved.
According to an embodiment of the present invention, the wastewater inlet 610 of the high efficiency reactor 600 is connected to the static mixer 300. Specifically, the sewage inlet 610 is disposed such that the incoming sewage enters the high efficiency reactor 600 in a tangential direction along the inner sidewall of the high efficiency reactor. Therefore, the mixing degree of sewage and purified gas can be further improved, and the problem of incomplete reaction of heavy metals and the like caused by uneven gas-liquid mixing is effectively solved.
Therefore, the purified gas is fully mixed with the sewage at three nodes in the Venturi mixer, the static mixer and when entering the high-efficiency reactor tangentially, so that the full mixing of the purified gas and the sewage is effectively ensured, and the removal rate of heavy metals in the sewage is improved. Finally, only one high-efficiency reactor 600 is needed to provide a reaction site and reaction time for sewage, so that the system has the advantages of simple equipment and simpler process.
According to an embodiment of the present invention, the overflow outlet 620 of the high efficiency reactor 600 is connected to the post-reaction sewage inlet 710 of the liquid-solid separation apparatus 700, so that the overflow product at the upper portion of the inside of the high efficiency reactor 600 overflows and is subjected to liquid-solid separation, so that purified sewage is obtained.
According to an embodiment of the present invention, the system further includes: the device comprises an intermediate tank 1000, wherein a stirrer 1100 is arranged in the intermediate tank 1000, and the intermediate tank 1000 is arranged between an overflow outlet 620 of the high-efficiency reactor and the liquid-solid separation device 700.
Therefore, the sewage before the filtered heavy metal sulfide precipitate is stirred, and the unreacted purified gas dissolved in the sewage can be released as much as possible. Furthermore, according to an embodiment of the present invention, the top gas outlet of the intermediate tank 1000 is connected to a first venturi mixer, so that the purge gas overflowing from the top of the intermediate tank is introduced into the first venturi mixer for recycling. Specifically, the negative pressure of the first Venturi mixer can be utilized to effectively suck the purified gas overflowing from the top of the middle tank out as much as possible and return the purified gas to the front reaction, so that the recycling of the purified gas is improved, and the excessive purified gas is prevented from being discharged randomly.
According to a specific embodiment of the present invention, the system further includes: a high efficiency reactor circulation pump 800 and a third venturi mixer 900. The high efficiency reactor circulation pump 800 is disposed between the circulation liquid outlet 620 and the circulation liquid inlet 630; the third venturi mixer 900 is disposed between the high efficiency reactor circulation pump 800 and the circulation liquid inlet 630.
Thus, by providing the high-efficiency reactor 600 with the high-efficiency reactor circulation pump 800 and the third venturi mixer 900 outside, the liquid-solid mixture passing through the bottom portion in the high-efficiency reactor 600 is extracted and returned into the high-efficiency reactor, and the third venturi mixer 900 is provided in the return line to add purge gas to the liquid-solid mixture. And further, the suction amount of the system to the purified gas can be effectively improved, so that the removal rate of heavy metal ions such as copper, arsenic and the like in the sewage is improved. In addition, through extracting the liquid-solid mixture with high-efficient reactor bottom and squeezing into the upper portion in the high-efficient reactor, can also reach the effect of circulation stirring reaction medium, this setting has effectively avoided appearing the possibility that highly toxic purified gas reveals in the mode that sets up the agitator more traditionally inside the high-efficient reactor.
In addition, according to an embodiment of the present invention, the circulating liquid inlet 630 formed on the sidewall of the high efficiency reactor 600 is tangentially arranged to the sidewall of the high efficiency reactor 600. And then the returned liquid-solid mixture can return to the inside of the high-efficiency reactor along the tangential direction of the side wall of the high-efficiency reactor, and then forms a rotational flow after entering the inside of the high-efficiency reactor, so that the mixing degree and the reaction rate of a reaction medium in the high-efficiency reactor are further improved, and the removal rate of heavy metals is further improved.
According to an embodiment of the present invention, the circulation liquid inlet 630 may include a plurality of inlets, and the plurality of inlets may be spaced apart from each other in a height direction on the sidewall of the high efficiency reactor 600. And the liquid-solid mixture can form cross flow at different heights, so that the mixing degree and the reaction rate of reaction media in the reactor are improved.
According to an embodiment of the present invention, the recycle inlet 630 is lower than the liquid level in the high efficiency reactor. This prevents the purge gas sucked in via the third venturi mixer from being drawn off directly by the first venturi mixer, thereby increasing this proportion H2S and sewage reaction time.
Therefore, the sewage is conveyed to the high-efficiency reactor in two paths, and the first Venturi mixer and the second Venturi mixer are respectively arranged on the two paths of pipelines. Wherein, the first Venturi mixer is used for sucking the purified gas remained at the top of the high-efficiency reactor and the middle tank, and the second Venturi mixer is used for sucking the fresh purified gas. And then can be effectual the problem of the purge gas recovery of complete reaction in the solution device, simultaneously, use the surplus ability for drawing in fresh purge gas and be used for reacting. In addition, fresh purified gas is replenished into the sewage again by utilizing the circulation of a liquid-solid mixture at the bottom in the high-efficiency reactor, so that the removal rate of heavy metals and the like in the sewage is effectively ensured. Therefore, the system of the embodiment of the invention can improve the removal rate of heavy metal ions such as copper, arsenic and the like in the sewage under the condition of ensuring safety, and simultaneously realize continuous removal of the heavy metal ions such as copper, arsenic and the like in the sewage.
In order to further understand the system for continuously purifying sewage by using purified gas according to the above embodiments of the present invention, the following description will be made on the implementation method of the system.
According to a specific embodiment of the invention, the method comprises:
(1) the sewage in the sewage tank 100 is conveyed in two paths by the sewage conveying pump 200, and a first venturi mixer 400 and a second venturi mixer 500 are respectively arranged on the two paths of pipelines so as to introduce purified gas into the sewage;
(2) mixing two paths of sewage containing purified gas by a static mixer 300, and then entering a high-efficiency reactor 600 for reaction so as to generate a precipitate;
(3) so that the overflow product at the upper part in the high-efficiency reactor continuously overflows and is subjected to liquid-solid separation 700, so as to obtain purified sewage.
Therefore, the sewage is conveyed to the high-efficiency reactor in two paths by the sewage conveying pump, the first Venturi mixer and the second Venturi mixer are respectively arranged on the two paths of pipelines, the static mixer is arranged on the main pipe after the two paths are converged, and negative pressure is formed at the suction cavity of the first Venturi mixer and the second Venturi mixer to suck purified gas. The mixed gas enters a static mixer for further mixing reaction through high-speed mixing reaction of a throat pipe of the first Venturi mixer and a throat pipe of the second Venturi mixer and deceleration pressurization of a Venturi diffusion pipe, and then enters the high-efficiency reactor. The purified gas and the sewage are further fully reacted in the high-efficiency reactor, and the sewage after the reaction continuously overflows and is sent to liquid-solid separation to obtain the purified sewage. Therefore, the invention skillfully utilizes the Venturi mixer to effectively mix the purified gas into the sewage, and the purified gas introduced by the method can be fully mixed into the sewage and reacts with heavy metal ions and the like in the sewage to generate precipitation, thereby obviously improving the purification efficiency. And the method can realize continuous removal of heavy metal ions in sewage, and has the advantages of simple process, simple equipment and reduced cost.
The method for continuously purifying sewage using purified gas according to the embodiment of the present invention will be described in detail.
The sewage treated by the method can be domestic production water, surface water and acidic sewage. The purge gas employed may be selected from H2S、O3、CO2At least one of (1). For example, CO may be utilized2Removing calcium from domestic and production water, and reducing hardness of domestic and production water; can utilize O3Sterilizing surface water; can utilize H2And S, removing heavy metal ions in the acidic sewage.
According to the specific embodiment of the invention, the sewage to be treated can be acid sewage containing heavy metals, and the concentration of the heavy metals in the acid sewage can be As: 1-30 g/L, Cu: 0.1-10 g/L, Hg: 0.01-5 g/L, Cd: 0.01-5 g/L, Cr: 0.01-5 g/L. Specifically, the acidic wastewater may be a waste acid containing heavy metal ions such as copper and arsenic from a flue gas purification process of a sulfuric acid system. For this purpose, the purge gas used may be H2And (4) S gas. Thereby, use H2The S gas can carry out fluidization reaction with the heavy metal in the acidic sewage, and the produced fluidized precipitate is separated out, so that the aim of purification is fulfilled.
To facilitate an understanding of the purification method of the above embodiment of the present invention, the following is given as H2S gasThe purification of acidic wastewater containing heavy metals is exemplified.
Step (1): firstly, the sewage tank 100 is used for conveying acidic sewage containing heavy metal ions in two paths by the sewage conveying pump 200, and a first venturi mixer 400 and a second venturi mixer 500 are respectively arranged on the two paths of pipelines so as to introduce H into the acidic sewage2And (4) S gas. Specifically, the invention utilizes the acidic sewage with certain pressure (more than 0.05Mpa) to pass through a Venturi mixer, and heavy metal and H in the acidic sewage2S gas is subjected to a sulfuration reaction to generate sulfuration precipitate, and then the sulfuration precipitate is separated out. Therefore, the invention adopts the Venturi mixer to feed H into the acidic sewage2The S gas is obtained by forming negative pressure in a sealed Venturi mixer to make H gas2The S gas and the acidic sewage are fully mixed. Not only can increase H2The mixing efficiency of S gas and H can be effectively avoided2S gas leaks.
Due to H2S gas is toxic gas, the leakage problem is a significant problem existing in the sewage treatment by purifying gas at present, and H gas existing at present2The S gas is mixed by blowing H into the sewage by a fan2S gas, and the method adopts power equipment to apply pressure to the sewage, so that a great leakage risk exists. The invention adopts a Venturi mixer to lead H to be in a sealed negative pressure condition2S gas is mixed with sewage, so that H can be effectively avoided2The possibility of leakage exists when the S gas passes through the fan power equipment, and the process safety is further remarkably improved.
In addition, the invention effectively increases H by conveying the acidic sewage through two paths and respectively arranging the Venturi mixers on the two paths of pipelines2S gas mixing point, obviously improves H2The efficiency of S gas integration into acidic wastewater. In addition, the invention skillfully utilizes the Venturi mixer to realize H in the conveying process of the acidic sewage2Mixing S gas and sewage, and further not only increasing H2The mixing efficiency of S gas and the continuous treatment of the acid sewage are realized, and the treatment efficiency of the acid sewage is obviously improved。
According to a specific embodiment of the present invention, H is used2S gas is H with high concentration2S gas, for example, may be H at a concentration of 70 to 100 vol%2S gas, and further H can be increased2The efficiency of S gas being merged into the acid sewage. Further, by using the above-mentioned H2The S gas and the Venturi mixer can ensure that 0.5-20 liters of H is finally mixed into each liter of acid sewage2S gas can further effectively remove heavy metals in the acidic sewage, and particularly can effectively remove As in the acidic sewage. The inventor also controls the introduction of H into the acidic sewage by measuring the concentration of As in the acidic sewage in advance2Concentration of S gas and H dissolved in final acidic wastewater2Amount of S gas. Thereby avoiding the introduction of excessive H2S gas causes reaction residue, and increases the burden of tail gas treatment.
Step (2): secondly, two paths of the mixture containing H2The acidic wastewater of the S gas is mixed by the static mixer 300 and then enters the high-efficiency reactor 600 to react, so as to generate a sulfide precipitate. The acidic sewage conveyed by the two paths is mixed by the static mixer before entering the high-efficiency reactor, so that the acidic sewage and H can be further improved2The mixing degree of S gas improves the reaction efficiency of heavy metal.
According to the specific embodiment of the present invention, in step (2), two paths containing H are introduced2The acidic wastewater of the S gas is mixed by the static mixer 300 and then enters the high-efficiency reactor 600 along the tangential direction of the sidewall of the high-efficiency reactor 600. Further, the acidic wastewater and H participating in the reaction can be further improved2The gas mixing degree of S effectively reduces the problem of insufficient reaction caused by uneven gas-liquid mixing.
Thus, H2S gas is fully mixed with the acidic sewage in the Venturi mixer, the static mixer and three nodes when entering the high-efficiency reactor tangentially, so that H is effectively ensured2The S gas is fully mixed with the acidic sewage, so that the removal rate of heavy metals in the acidic sewage is improved. Finally, only one high-efficiency reactor is needed to provide reaction for the acidic sewageThe method has simple equipment and simpler flow.
And (3): finally, the overflow product at the upper part in the high efficiency reactor 600 is overflowed and subjected to liquid-solid separation to obtain purified waste liquid.
According to a specific embodiment of the present invention, step (3) further comprises: and enabling overflow products at the upper part in the high-efficiency reactor to continuously overflow into the intermediate tank, stirring and then carrying out liquid-solid separation. Thereby dissolving unreacted H in the acidic sewage2The S gas is released as much as possible. And according to a specific embodiment of the present invention, further comprising: h overflowing the top of the middle groove2The S gas is passed into the first venturi mixer 400 for recovery. Specifically, the negative pressure of the first venturi mixer 400 can be utilized to effectively discharge the H overflowing from the top of the intermediate tank2The S gas is pumped out as much as possible and returns to the previous reaction, thereby increasing H2S gas recovery and reuse while avoiding excessive H2And (4) discharging the S gas at will.
And (4): in addition, the method also comprises the steps of pumping out the liquid-solid mixture at the bottom in the high-efficiency reactor 600 and returning the liquid-solid mixture to the high-efficiency reactor 600, and simultaneously, arranging a third Venturi mixer 900 on a return pipeline to introduce H into the liquid-solid mixture2And (4) S gas. A third Venturi mixer 900 is thus arranged on the return line, and H is replenished by means of the third Venturi mixer 9002S gas, can effectively improve system pair H2The suction amount of S gas is increased, so that the removal rate of heavy metal ions such as copper, arsenic and the like in the acidic sewage is improved.
Specifically, a circulating pump may be disposed outside the high-efficiency reactor, and the liquid-solid mixture may be pumped out of the bottom of the high-efficiency reactor and into the upper portion of the high-efficiency reactor. Thereby achieving the purpose of circularly stirring the reaction medium and effectively avoiding the occurrence of high-toxicity H in a mode of arranging a stirrer in the high-efficiency reactor2Possibility of S gas leakage.
According to an embodiment of the present invention, in this step, the liquid-solid mixture at the bottom of the high efficiency reactor is extracted and returned to the high efficiency reactor along the tangential direction of the side wall of the high efficiency reactor. Whereby the liquid-solid mixture forms a rotational flow after entering the high efficiency reactor. Or aimed at the central axis of the high efficiency reactor, whereby strong impingement of the water streams may occur. And further, the mixing degree and the reaction rate of the reaction medium in the high-efficiency reactor can be further improved, and the removal rate of heavy metals is further improved.
According to an embodiment of the present invention, the liquid-solid mixture may be returned to the high efficiency reactor through a plurality of circulating liquid inlets with different heights. Thereby leading the media in the reactor to form cross flow at different heights and improving the mixing degree and the reaction rate of the reaction media in the reactor.
According to an embodiment of the present invention, the method further includes:
and (5): h overflowing from the top of the high-efficiency reactor 6002The S gas is passed into the first venturi mixer 400 for recovery. Specifically, the negative pressure of the first venturi mixer 400 can be utilized to effectively remove the overflow H from the top of the high efficiency reactor 6002The S gas is pumped out as much as possible and returns to the previous reaction, thereby increasing H2S gas recovery and reuse while avoiding excessive H2And (4) discharging the S gas at will.
Therefore, the present invention provides a first venturi mixer 400 and a second venturi mixer 500 on two pipelines by delivering the acidic wastewater to the high efficiency reactor 600 in two pipelines. Wherein the first venturi mixer 400 is used to suck in the H remaining at the top of the high efficiency reactor 600 and the middle tank 10002S gas, second Venturi Mixer 500 for fresh H suction2And (4) S gas. Thereby effectively solving the problem of incomplete reaction of H in the device2S gas reuse problem, while the excess capacity is used for pumping in fresh H2The S gas is used for the reaction.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims (8)

1. A system for continuously purifying sewage with gas, comprising:
a sewage tank;
the sewage conveying pump is connected with the sewage tank;
the static mixer is connected with the sewage delivery pump through two pipelines;
a first venturi mixer and a second venturi mixer, the first venturi mixer and the second venturi mixer being disposed on the two pipes, respectively, the first venturi mixer and the second venturi mixer having purge gas suction ports;
the high-efficiency reactor is provided with a sewage inlet, an overflow outlet and a purified gas outlet, the sewage inlet is connected with the static mixer, and an overflow pipe extending into the high-efficiency reactor is arranged in the overflow outlet;
the liquid-solid separation device is provided with a reacted sewage inlet, a precipitation outlet and a purified sewage outlet, and the reacted sewage inlet is connected with the overflow outlet.
2. The system of claim 1, further comprising:
a high efficiency reactor circulation pump having a circulation fluid outlet and a circulation fluid inlet, the high efficiency reactor circulation pump disposed between the circulation fluid outlet and the circulation fluid inlet;
and the third Venturi mixer is arranged between the circulating pump of the high-efficiency reactor and the circulating liquid inlet, and is connected with the purified gas storage tank.
3. The system of claim 2, further comprising:
the intermediate tank is internally provided with a stirrer or a circulating pump and is arranged between the overflow outlet of the high-efficiency reactor and the liquid-solid separation device.
4. The system of claim 3, wherein the first venturi mixer is connected to the top gas outlet of the intermediate tank and the purge gas outlet of the high efficiency reactor, respectively, to recover the purge gas.
5. The system of claim 2 or 4, wherein the circulating liquid inlet on the high efficiency reactor side wall is tangential to the high efficiency reactor side wall; or the circulating liquid inlet is arranged along the diameter direction of the high-efficiency reactor.
6. The system of claim 5, wherein the circulation fluid inlet comprises a plurality of circulation fluid inlets spaced apart in height on the high efficiency reactor sidewall.
7. The system of claim 6, wherein the recycle liquid inlet is below a liquid level within the high efficiency reactor.
8. The system of claim 1, wherein the first venturi mixer, the second venturi mixer, and the third venturi mixer each have at least two purge gas intake ports.
CN201910250367.1A 2019-03-29 2019-03-29 System for continuously purifying sewage by using gas Pending CN111747558A (en)

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CN201910250367.1A CN111747558A (en) 2019-03-29 2019-03-29 System for continuously purifying sewage by using gas
PCT/CN2019/093384 WO2020199382A1 (en) 2019-03-29 2019-06-27 Method and system for continuously purifying sewage by using gas
CL2021002436A CL2021002436A1 (en) 2019-03-29 2021-09-20 Method and system for continuous purification of wastewater through the use of gas

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111747501A (en) * 2019-03-29 2020-10-09 中国瑞林工程技术股份有限公司 Method and system for continuously purifying sewage by using gas

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111747501A (en) * 2019-03-29 2020-10-09 中国瑞林工程技术股份有限公司 Method and system for continuously purifying sewage by using gas

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