CN214088061U - Zinc-containing wastewater recycling treatment system - Google Patents
Zinc-containing wastewater recycling treatment system Download PDFInfo
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- CN214088061U CN214088061U CN202023276858.0U CN202023276858U CN214088061U CN 214088061 U CN214088061 U CN 214088061U CN 202023276858 U CN202023276858 U CN 202023276858U CN 214088061 U CN214088061 U CN 214088061U
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Abstract
The utility model relates to a zinc-containing waste water recycling treatment system, this system include waste water collecting pit, integration flocculation and precipitation unit, middle water tank, first filter unit, ultrafiltration unit, second filter unit, RO water treatment unit and retrieval and utilization water tank in proper order the bottom of waste water collecting pit is equipped with first aeration equipment still be equipped with second aeration equipment in the integration flocculation and precipitation unit. This system is through the effectual organic matter that gets rid of in zinciferous waste water of integration flocculation and precipitation unit, microorganism, heavy metal ion and other suspended solids, first aeration equipment all makes the flocculation and precipitation reaction more abundant with setting up of second aeration equipment, before RO reverse osmosis process, the filter unit has still been set gradually, ultrafiltration unit, further get rid of zinc in a large number through the materialization method, iron plasma, alleviate RO's burden greatly, prevent that the membrane is dirty stifled, the RO water treatment unit of being convenient for carries out regeneration and reuse to water, both the environment is protected, realize the utilization of resources simultaneously.
Description
Technical Field
The utility model relates to a waste water treatment technical field especially relates to a zinc-containing waste water recycling treatment system.
Background
The zinc-containing heavy metal sewage is a great problem in the front of galvanizing enterprises. The discharge of the zinc-containing wastewater has serious harm to the health of human bodies and the activities of industry and agriculture, has the harm of persistence, high toxicity, serious pollution and the like, once the zinc element enters the environment, the zinc element cannot be biodegraded, most of the zinc element participates in food chain circulation and is finally accumulated in organisms to destroy the normal physiological metabolic activity of the organisms, thus the health of human bodies is harmed. The common methods for treating the zinc-containing electroplating wastewater include an ion exchange method, current decomposition, a coagulating sedimentation method and the like.
Among them, the current decomposition is not widely used because it is likely to cause a large power consumption and a large consumption of iron plates. The ion exchange method has certain advantages in removing low-concentration zinc-containing wastewater from a solution, but is not applicable to a water body with high zinc concentration, the resin needs to be regenerated when the ion exchange method is used for treating the zinc-containing wastewater, the zinc-containing wastewater is enriched in a concentrated solution, and the concentrated solution needs to be treated. The principle of the coagulating sedimentation method is that coagulants (lime, iron salt and aluminum salt) are added into zinc-containing wastewater, under the alkalescent condition that the pH value is 8-10, hydroxide floccules are formed, zinc ions are flocculated, and coprecipitation is separated out.
Disclosure of Invention
The application mainly solves the problem of how to efficiently and fully remove zinc ions and zinc-containing impurities in zinc-containing wastewater, and provides a sewage treatment system.
In order to realize the above-mentioned purpose, this application provides a zinc-containing waste water recycling treatment system, this system include waste water collecting tank, integration flocculation and precipitation unit, middle water tank, first filter unit, ultrafiltration unit, second filter unit, RO water treatment unit and retrieval and utilization water tank in proper order waste water collecting tank's bottom is equipped with first aeration equipment still be equipped with second aeration equipment in the integration flocculation and precipitation unit.
As a further improvement of the application, a stirring device for stirring the zinc-containing wastewater in the wastewater collection tank is arranged at the upper part of the first aeration device.
As a further improvement of this application, integration flocculation and precipitation unit is including intaking district, settling zone, buffers, mud district and play water zone, second aeration equipment set up in it is interior to intake, it still is equipped with dosing pump and control to intake the district the dosing controlling means of dosing pump.
As a further development of the application, a porous packing is provided in the precipitation zone.
As a further improvement of the application, the pore diameter of the porous filler is between 5mm and 15 mm.
As a further improvement of the present application, the first filtering unit comprises a manganese sand filter, an activated carbon filter and a first safety filter in sequence; the second filtering unit is a second security filter.
As a further improvement of the present application, an evaporator is provided at the RO water treatment unit.
As a further refinement of the present application, the evaporator is an MVR evaporator.
As a further improvement of the application, a sludge storage tank is arranged at the integrated flocculation and precipitation unit.
As a further improvement of the application, a plate-and-frame filter press is arranged at the sludge storage tank.
The beneficial effect of this application lies in, this application through providing a zinc-containing waste water recycling treatment system, this system includes waste water collecting pit, integration flocculation and precipitation unit, middle water tank, first filter unit, ultrafiltration unit, second filter unit, RO water treatment unit and retrieval and utilization water tank in proper order the bottom of waste water collecting pit is equipped with first aeration equipment still be equipped with second aeration equipment in the integration flocculation and precipitation unit. This system is through the effectual organic matter that gets rid of in zinciferous waste water of integration flocculation and precipitation unit, microorganism, heavy metal ion and other suspended solids, first aeration equipment all makes the flocculation and precipitation reaction more abundant with setting up of second aeration equipment, before RO reverse osmosis process, the filter unit has still been set gradually, ultrafiltration unit, further get rid of zinc in a large number through the materialization method, iron plasma, alleviate RO's burden greatly, prevent that the membrane is dirty stifled, the RO water treatment unit of being convenient for carries out regeneration and reuse to water, both the environment is protected, realize the utilization of resources simultaneously.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of a zinc-containing wastewater recycling treatment system.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more clear, the following description of the present application will be made in detail and completely with reference to the specific embodiments and the accompanying drawings. It should be understood that the described embodiments are only a few embodiments of the present application, not all embodiments, and are not intended to limit the scope of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
For realizing high-efficient, convenient processing zinciferous heavy metal sewage, this application provides this system and includes waste water collecting tank, integration flocculation and precipitation unit, middle water tank, first filter unit, ultrafiltration unit, second filter unit, RO water treatment unit and retrieval and utilization water tank in proper order waste water collecting tank's bottom is equipped with first aeration equipment still be equipped with second aeration equipment in the integration flocculation and precipitation unit.
In the application, the aeration device is equipment for supplying oxygen to an aeration tank in the wastewater treatment process, the aeration not only makes liquid in the tank contact with air for oxygenation, but also accelerates the transfer of oxygen in the air to the liquid due to stirring of the liquid, thereby completing the purpose of oxygenation; in addition, the aeration also can prevent the suspension body in the tank from sinking and strengthen the contact between the organic matters and the microorganisms in the tank and the dissolved oxygen, thereby ensuring the oxidative decomposition of the microorganisms in the tank on the organic matters in the sewage under the condition of sufficient dissolved oxygen. The quality of the aeration device not only affects the biochemical treatment effect of sewage, but also directly affects the land occupation, investment and operation cost of a treatment field. The aeration device has the following modes: (1) a blower aeration device: mainly comprises an aeration blower, a connecting pipeline and an aerator; (2) a mechanical aeration device: mainly comprises an underwater aerator and a diffusion device. In this application, the preferred air-blower aeration equipment of aeration equipment that uses the bottom of waste water collecting tank sets up a plurality of aerators, and this kind of aeration equipment, aeration air current stability is good, can be according to impurity content adjustment aeration air current in the quality of water moreover, is favorable to saving the cost. In a further preferable embodiment, a stirring device for stirring the zinc-containing wastewater in the wastewater collection tank is arranged at the upper part of the aeration device, the stirring device is a spiral stirring paddle, and the rotating speed of the spiral stirring paddle is 300 r/min-1500 r/min. The cooperation of agitating unit and aeration equipment in this application enables organic matter and the abundant decomposition of microorganism in the waste water.
In this application, the flocculation and precipitation is the process that the particulate matter was made the flocculation and precipitation in aqueous, select for use inorganic flocculant and organic anion promptly and prepare into aqueous solution and add in the waste water, just can produce the compression electric double layer, make the suspended particle in the waste water lose stability, colloidal particle looks mutual condensation makes the particle increase, forms flocculating constituent, alum blossom, the flocculating constituent is grown to and breaks away from the aqueous phase under the action of gravity promptly after certain volume and deposits, thereby get rid of a large amount of suspended solids in the waste water, thereby reach the effect of water treatment. Alum floc formed after coagulant is added into ground water, organic suspended matters in domestic sewage and activated sludge are flocculated and precipitated in the precipitation process. In this application, integration flocculation and precipitation unit contains dosing pump, adds medicine controlling means and sedimentation tank, and wherein, sedimentation tank sets up into five parts in district, settling zone, buffers, mud district and the play pool of intaking district department sets up the dosing pump entry. The water inlet area and the water outlet area have the functions of enabling water flow to uniformly flow through the sedimentation tank, avoiding the adverse effects of short flow and reduction of turbulent flow on sedimentation, reducing dead water areas and improving the volume utilization rate of the sedimentation tank; the settling zone is also called a clarification zone, namely a working zone of the settling tank, and is a zone which can separate settling particles from wastewater; the sludge area is an area for storing, concentrating and discharging sludge; the buffer zone is a water layer zone for separating the settling zone from the sludge zone, and ensures that settled particles are not floated again due to the stirring of water flow.
As a preferred embodiment, NaOH, PAC and PAM are used as agents in the process of treating the zinc-containing wastewater in the integrated flocculation precipitation unit. The polyaluminium chloride (PAC) is fundamentally different from the traditional inorganic coagulant in that the traditional inorganic coagulant is low-molecular crystal salt, and the structure of the polyaluminium chloride consists of multi-element carboxyl complex with various forms, so that the flocculation precipitation speed is high, the applicable PH value range is wide, the corrosion to pipeline equipment is avoided, the water purification effect is obvious, and the heavy metal ions such as the chromaticness SS, the COD, the BOD, the arsenic, the mercury and the like in water can be effectively removed; the flocculation of Polyacrylamide (PAM) flocculants in wastewater treatment is due to its two characteristics: the long-chain (linear) molecular structure and polyacrylamide molecules contain a large amount of active groups, the flocculation effect of the polyacrylamide flocculant and colloid in the wastewater is generated through two forms of chemical adsorption and physical network, and according to the mechanism, the polyacrylamide with higher molecular weight and longer molecules can adsorb more particles and has stronger network forming capability, so the flocculation efficiency is better; the NaOH is mainly used for adjusting the pH value of the sewage in the integrated flocculation precipitation unit. In the application, as a preferable embodiment, a second aeration device is further arranged in the integrated flocculation and precipitation unit, and the second aeration device can quickly and fully treat organic matters and microorganisms in the integrated flocculation and precipitation unit. The sedimentation tank is provided with an integrated flocculation and sedimentation unit comprising a water inlet area, a sedimentation area, a buffer area, a sludge area and a water outlet area, and the second aeration device is arranged at the water inlet area to promote the full reaction of a flocculating agent, a coagulant aid and a pH value regulator with organic matters and microorganisms in the wastewater. As a preferred embodiment, the settling zone is provided with a porous filler, the porous filler divides the settling zone into an upper layer and a lower layer, the flocculated large-particle sediment is deposited on the upper part of the porous filler, the upper part of the settling zone is provided with a sludge discharge port of the settling zone, and the filtrate passing through the porous filler enters a buffer zone for further settling, so that organic matters, microorganisms and other suspended particles in the wastewater can be removed. As a further preferred embodiment, the pore size of the porous filler is between 5mm and 15 mm.
In the present application, as a preferred embodiment, a sludge reservoir is provided at the integrated flocculation and sedimentation unit. The sludge has a water content of about 95-97% after concentration and digestion, the volume is still large, void water and capillary water in the sludge can be further removed by sludge dehydration, the volume is reduced, the water content of the sludge can be reduced to 70-80% after dehydration treatment, the volume is 1/10-1/4 of the original volume, and subsequent transportation and treatment are facilitated. In this application, as preferred embodiment the water tank in the middle of the exit of integration flocculation and precipitation unit sets up, middle water tank plays the cushioning effect on the one hand, and on the other hand can also deposit the sediment in the sewage again, middle water tank sets up sedimentation tank and clean water basin, water in the sedimentation tank gets into in the clean water basin through the mode of overflow.
In this application, the filter unit includes manganese sand filter, activated carbon filter and first safety filter in proper order. The manganese sand filter is mainly used for removing iron ions and manganese ions in wastewater, after the iron and manganese ions are aerated and oxidized, ferrous iron and ferrous manganese in raw water can be oxidized into insoluble ferric iron and tetravalent manganese compounds respectively, and the iron and manganese can be removed by utilizing the adsorption filtration of the manganese sand filter. Quartz sand filter is jar internal portion and packs the quartz sand filter material, and the quartz sand filter material is mainly impurity such as silt of interception aquatic, and the quartz sand is different from ordinary sand, because quartz hardness is than stronger, and the granule can be thinner, if with ordinary sand, through the backwash, just wash very easy breakage, and the live time has long will lead to sand to run off more seriously, when the quartz sand filter in this application uses under the abominable condition of environment, long service life, save the cost. In this application, set up the ultrafiltration unit behind the filter unit, the ultrafiltration technology is one of membrane separation technology, is to utilize the interception ability of porous membrane as the driving force with 0.1 ~ 0.5 MPa's pressure differential to the mode of physics interception separates the material granule of the variation in size in the solution, thereby reaches the purpose of purification and concentration, screening different components in the solution, in this application, the aperture of milipore filter is between 10 nm-60 nm. A second security filter is also provided after the ultrafiltration unit.
In the application, the cartridge filter is mainly used for solid-liquid separation of various suspensions, and has high environmental requirements. The cartridge filter is therefore placed after the manganese sand filter and the activated carbon filter. The cartridge filter is mainly used after the multi-medium pretreatment filtration and before membrane filtration equipment such as reverse osmosis, ultrafiltration and the like. The filter element is used for filtering fine substances (such as tiny quartz sand, activated carbon particles and the like) filtered by a plurality of media so as to ensure the water quality filtering precision and protect the membrane filter element from being damaged by large-particle substances. The precision grade of the filtering element arranged in the precise filtering device can be divided into 0.5 mu s,1 mu s,5 mu s,10 mu s and the like, and different filtering precisions are selected according to different use occasions to ensure the precision of the post-stage water outlet and the safety of the post-stage membrane element. The first safety filter is mainly used for filtering out tiny quartz sand, active carbon and the like.
In the application, the RO water treatment unit can remove bacteria, viruses, colloids, organic matters and more than 98% of soluble salts in water. The method has the characteristics of low operation cost, simple operation, high automation degree, stable effluent quality and the like. The core of the RO water treatment unit is an RO membrane, and the membrane process is used for overcoming the osmotic pressure of a solvent (usually water) by utilizing the selectivity of the RO membrane and taking the static pressure difference on two sides of the membrane as a power, allowing the solvent to pass through to intercept ionic substances and separating a liquid mixture. There are 2 requirements for performing the RO separation process: firstly, the external pressure must be larger than the osmotic pressure of the solution (the operation pressure is generally 1.5-10.5 MPa); and the other is that a semipermeable membrane with high water permeability and high selectivity is required. The pore diameter of the micro-pores on the surface of the RO membrane is generally less than 1nm, and the RO membrane has high removal rate to most of inorganic salts, soluble organic matters, soluble solids, organisms and colloids.
In the present application, as a preferred embodiment, an evaporator is further provided after the RO water treatment unit; as a further preferred embodiment, the evaporator is an MVR evaporator, and the system is provided with the MVR evaporator at the tail end of sewage treatment, so that zero emission of polluted waste at the tail end of sewage treatment can be realized.
To sum up, this application includes waste water collecting tank, integration flocculation and precipitation unit, middle water tank, first filter unit, ultrafiltration unit, second filter unit, RO water treatment unit and retrieval and utilization water tank in proper order through providing a zinc-containing waste water recycling treatment system the bottom of waste water collecting tank is equipped with first aeration equipment still be equipped with second aeration equipment in the integration flocculation and precipitation unit. This system is through the effectual organic matter that gets rid of in zinciferous waste water of integration flocculation and precipitation unit, microorganism, heavy metal ion and other suspended solids, first aeration equipment all makes the flocculation and precipitation reaction more abundant with setting up of second aeration equipment, before RO reverse osmosis process, the filter unit has still been set gradually, ultrafiltration unit, further get rid of zinc in a large number through the materialization method, iron plasma, alleviate RO's burden greatly, prevent that the membrane is dirty stifled, the RO water treatment unit of being convenient for carries out regeneration and reuse to water, both the environment is protected, realize the utilization of resources simultaneously.
Although the description is given in terms of embodiments, not every embodiment includes only a single embodiment, and such description is for clarity only, and those skilled in the art will recognize that the embodiments described herein may be combined as a whole to form other embodiments as would be understood by those skilled in the art.
The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.
Claims (10)
1. The utility model provides a zinc-containing waste water recycling treatment system, its characterized in that, this system include waste water collecting pit, integration flocculation and precipitation unit, middle water tank, first filter unit, ultrafiltration unit, second filter unit, RO water treatment unit and retrieval and utilization water tank in proper order the bottom of waste water collecting pit is equipped with first aeration equipment still be equipped with second aeration equipment in the integration flocculation and precipitation unit.
2. The zinc-containing wastewater recycling treatment system of claim 1, wherein a stirring device for stirring the zinc-containing wastewater in the wastewater collection tank is arranged at the upper part of the first aeration device.
3. The zinc-containing wastewater recycling treatment system of claim 1, wherein the integrated flocculation and precipitation unit comprises a water inlet area, a precipitation area, a buffer area, a sludge area and a water outlet area, the second aeration device is arranged in the water inlet area, and the water inlet area is further provided with a dosing pump and a dosing control device for controlling the dosing pump.
4. The zinc-containing wastewater recycling treatment system of claim 3, wherein a porous filler is provided in the settling zone.
5. The zinc-containing wastewater recycling treatment system of claim 4, wherein the pore size of the porous filler is between 5mm and 15 mm.
6. The zinc-containing wastewater recycling treatment system of claim 1, wherein the first filtering unit comprises a manganese sand filter, an activated carbon filter and a first safety filter in sequence; the second filtering unit is a second security filter.
7. The zinc-containing wastewater recycling treatment system of claim 1, wherein an evaporator is provided at said RO water treatment unit.
8. The zinc-containing wastewater recycling treatment system of claim 7, wherein the evaporator is an MVR evaporator.
9. The zinc-containing wastewater recycling treatment system of claim 1, wherein a sludge storage tank is arranged at the integrated flocculation and precipitation unit.
10. The zinc-containing wastewater recycling treatment system of claim 9, wherein a plate and frame filter press is arranged at the sludge storage tank.
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| CN202023276858.0U CN214088061U (en) | 2020-12-30 | 2020-12-30 | Zinc-containing wastewater recycling treatment system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115465970A (en) * | 2022-09-27 | 2022-12-13 | 江西江铜银珠山矿业有限公司 | Production process for degrading zinc content in wastewater by comprehensively stirring lime and zinc-containing wastewater |
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2020
- 2020-12-30 CN CN202023276858.0U patent/CN214088061U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115465970A (en) * | 2022-09-27 | 2022-12-13 | 江西江铜银珠山矿业有限公司 | Production process for degrading zinc content in wastewater by comprehensively stirring lime and zinc-containing wastewater |
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