CN211921176U - Metal processing wastewater treatment device - Google Patents
Metal processing wastewater treatment device Download PDFInfo
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- CN211921176U CN211921176U CN201922252600.8U CN201922252600U CN211921176U CN 211921176 U CN211921176 U CN 211921176U CN 201922252600 U CN201922252600 U CN 201922252600U CN 211921176 U CN211921176 U CN 211921176U
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Abstract
The utility model relates to a processing apparatus of metalworking waste water, include: the microfiltration membrane is used for filtering the metal cleaning wastewater; the first reverse osmosis membrane is connected to the permeation side of the microfiltration membrane and is used for performing reverse osmosis treatment on the permeate of the microfiltration membrane; the second reverse osmosis membrane is connected to the permeation side of the first reverse osmosis membrane and is used for performing reverse osmosis treatment on the permeate of the first reverse osmosis membrane; the concentration side of the second reverse osmosis membrane is connected with the feed inlet of the first reverse osmosis membrane; the ion exchange resin column is connected to the concentration side of the first reverse osmosis membrane and is used for carrying out ion exchange treatment on the concentrated solution of the first reverse osmosis membrane to remove impurity metal ions; and the evaporative crystallizer is connected with a water producing port of the ion exchange resin column and is used for carrying out evaporative concentration crystallization treatment on the water produced by the ion exchange resin to obtain the recovered NaCl salt.
Description
Technical Field
The utility model relates to a processing apparatus of metalworking waste water belongs to water treatment technical field.
Background
The metal processing washing wastewater is a large amount of wastewater generated in the mechanical processing process, contains a large amount of suspended matters, sodium chloride and soluble organic matters, is a main pollution source of the wastewater in the metal processing industry, and causes great harm to the environment.
The metal processing washing wastewater is mainly generated from wastewater generated in the process of washing in the mechanical processing process, and can be subjected to the steps of acid washing, alkali washing and the like in the washing process, and in the process, oil stains on the surface of metal, NaCl salt generated after an acid-base cleaning agent is neutralized, and fine particles on the surface of the metal can be introduced into the wastewater. After mixing and adjusting, the waste water has the following characteristics: SS not more than 600mg/L, hardness (as CaCO)3Calculated) is not more than 150mg/L, TDS is not more than 10000 mg/L, Cl-Not more than 6500mg/L.
Because the metal processing washing wastewater has small water volume, a sewage treatment station is independently established for treatment, the investment is high, and the sewage treatment station cannot be operated well. Meanwhile, the wastewater contains a large amount of white suspended matters, so that the biochemical performance is poor and the treatment difficulty is high. The wastewater is directly discharged into a sewage treatment plant, and the normal operation of the sewage treatment plant can be influenced.
SUMMERY OF THE UTILITY MODEL
The utility model aims at: the method is used for treating cleaning wastewater generated by acid washing and alkali washing processes of metal surfaces in the metal processing process, and the wastewater mainly contains oil stains, organic matters, metal particles on the metal surfaces and NaCl salt generated by acid-base neutralization.
The technical scheme of the utility model is that:
a treatment method of metal processing wastewater comprises the following steps:
step 1, carrying out microfiltration treatment on the metal processing wastewater;
step 2, filtering the microfiltration penetrating fluid through a first reverse osmosis membrane;
step 3, filtering the penetrating fluid of the first reverse osmosis membrane through the second reverse osmosis membrane;
step 4, returning the concentrated solution of the second reverse osmosis membrane to the first reverse osmosis membrane for treatment;
and 5, evaporating and crystallizing the concentrated solution of the first reverse osmosis membrane to obtain recovered NaCl.
In one embodiment, the metal processing wastewater is wastewater obtained by washing metal surfaces with acid and alkali.
In one embodiment, the metal processing wastewater SS does not exceed 600mg/L and has hardness (as CaCO)3Calculated) is not more than 150mg/L, TDS is not more than 10000 mg/L, Cl-Not more than 6500mg/L.
In one embodiment, the metal working wastewater is subjected to a cyclonic treatment, whereby the oil phase is removed from the top and the bottom aqueous phase is passed to a microfiltration membrane for treatment.
In one embodiment, the concentrate of the microfiltration process is subjected to pressure filtration by using a pressure filter to obtain solid particles.
In one embodiment, the microfiltration process adopts cross-flow filtration, the flow rate of the membrane surface is controlled to be 3-5m/s, the operating pressure is controlled to be 0.1-1MPa, and the temperature is controlled to be 1-80 ℃.
In one embodiment, the microfiltration process is carried out by adopting an external pressure type microfiltration membrane, and the membrane element is provided with filtrate backwashing and gas scrubbing, and when the transmembrane pressure difference of the membrane is greater than a set value, the system automatically enters a backwashing program.
In one embodiment, in step 5, the concentrated solution of the first reverse osmosis membrane is treated by ion exchange resin and then subjected to evaporative crystallization.
An apparatus for treating metal processing wastewater, comprising:
the microfiltration membrane is used for filtering the metal cleaning wastewater;
the first reverse osmosis membrane is connected to the permeation side of the microfiltration membrane and is used for performing reverse osmosis treatment on the permeate of the microfiltration membrane;
the second reverse osmosis membrane is connected to the permeation side of the first reverse osmosis membrane and is used for performing reverse osmosis treatment on the permeate of the first reverse osmosis membrane; the concentration side of the second reverse osmosis membrane is connected with the feed inlet of the first reverse osmosis membrane;
the ion exchange resin column is connected to the concentration side of the first reverse osmosis membrane and is used for carrying out ion exchange treatment on the concentrated solution of the first reverse osmosis membrane to remove impurity metal ions;
and the evaporative crystallizer is connected with a water producing port of the ion exchange resin column and is used for carrying out evaporative concentration crystallization treatment on the water produced by the ion exchange resin to obtain the recovered NaCl salt.
In one embodiment, further comprising: the cyclone separator is used for carrying out cyclone separation treatment on the metal cleaning wastewater, the bottom of the cyclone separator is a water phase outlet which is connected with a water inlet of the micro-filtration membrane, and the top of the cyclone separator is an oil phase outlet which is connected with the biochemical treatment tank.
In one embodiment, the filtration pore size of the microfiltration membrane is 0.002-0.2um, and the membrane element is in a tube type, a plate type, a disc type or a capillary tube type.
In one embodiment, further comprising: and the filter press is connected to the concentration side of the microfiltration membrane and used for carrying out filter pressing treatment on the concentrated solution obtained from the microfiltration membrane to obtain solid waste.
In one embodiment, the filter press is a plate or box filter press, wherein the filter plate is made of cast iron, rubber or polypropylene.
Advantageous effects
The method of the utility model can effectively treat the waste water produced in the cleaning of the metal processing process, can obtain solid particles from the waste water, and can recover the industrial salt in the waste water.
Drawings
Fig. 1 is a diagram of the device of the present invention.
Wherein, 1, microfiltration membrane; 2. a first reverse osmosis membrane; 3. a second reverse osmosis membrane; 4. ion exchange resin column; 5. an evaporative crystallizer; 6. a filter press; 7. a cyclone separator; 8. a biochemical treatment tank.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments. It will be understood by those skilled in the art that the following examples are illustrative of the present invention only and should not be taken as limiting the scope of the invention. The examples do not specify particular techniques or conditions, and are performed according to the techniques or conditions described in the literature in the art or according to the product specifications. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products commercially available.
Approximating language, as used herein throughout the specification and claims, may be applied to modify any quantitative representation that could permissibly vary without resulting in a change in the basic function to which it is related. Accordingly, a value modified by a term or terms, such as "about," is not to be limited to the precise value specified. In at least some instances, the approximating language may correspond to the precision of an instrument for measuring the value. Unless context or language indicates otherwise, range limitations may be combined and/or interchanged, and such ranges are identified and include all the sub-ranges included herein. Other than in the operating examples, or where otherwise indicated, all numbers or expressions referring to quantities of ingredients, reaction conditions, and so forth used in the specification and claims are to be understood as modified in all instances by the word "about".
The recitation of values by ranges is to be understood in a flexible manner to include not only the numerical values explicitly recited as the limits of the range, but also to include all the individual numerical values or sub-ranges encompassed within that range as if each numerical value and sub-range is explicitly recited. For example, a concentration range of "about 0.1% to about 5%" should be interpreted to include not only the explicitly recited concentration of about 0.1% to about 5%, but also include individual concentrations (e.g., 1%, 2%, 3%, and 4%) and sub-ranges (e.g., 0.1% to 0.5%, 1% to 2.2%, 3.3% to 4.4%) within the indicated range.
The term "removal" in the present specification includes not only a case where a target substance is completely removed but also a case where the target substance is partially removed (the amount of the substance is reduced). "purification" in this specification includes the removal of any or specific impurities.
The words "include," "have," or any other variation thereof, as used herein, are intended to cover a non-exclusive inclusion. For example, a process, method, article, or apparatus that comprises a list of elements is not necessarily limited to those elements, but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The utility model discloses the waste water that will handle comes from and carries out the waste water that acid-base washing process produced to metal surface in to the metal working process, wherein contains the greasy dirt on metal surface, the NaCl salt that generates after acid-base cleaner neutralization to and the tiny granule on metal surface. After mixing and adjusting, the waste water has the following characteristics: SS not more than 600mg/L, hardness (as CaCO)3Calculated) is not more than 150mg/L, TDS is not more than 10000 mg/L, Cl-Not more than 6500mg/L.
The utility model discloses an in the method, if can contain when more greasy dirt in the waste water, can carry out oil-water separation through cyclone's method earlier, the proportion of oil is less, discharges from cyclone's top, and the proportion of water and granule is great, discharges from the bottom.
And filtering the obtained wastewater by a microfiltration membrane, wherein the microfiltration can filter out particles in the wastewater, the microfiltration membrane system adopts cross flow filtration, the membrane surface flow rate is controlled at 3-5m/s, the operating pressure is controlled at 0.1-1MPa, the temperature is controlled at 1-80 ℃, the membrane element adopts an external pressure type microfiltration membrane, filtrate backwashing and gas scrubbing are arranged, and when the transmembrane pressure difference of the membrane is greater than a set value, the system automatically enters a backwashing program. The filtrate enters the water inlet side through the water production end to take away the pollutants, so that the membrane flux is recovered. The micro-filtration membrane is cleaned chemically, and the chemicals are mainly acid, alkali and sodium hypochlorite.
The microfiltration permeate is subjected to two-stage reverse osmosis treatment, a reverse osmosis system adopts a pollution-resistant reverse osmosis membrane element, and the rejection rate of the pollution-resistant reverse osmosis membrane element to sodium chloride is more than 99%. The reverse osmosis membrane system comprises a reverse osmosis water inlet pump, a cartridge filter, a primary booster pump, a secondary booster pump and a reverse osmosis membrane component, and all the devices are connected through pipelines. The wastewater from the cartridge filter firstly enters the first stage reverse osmosis device, and the permeate of the first stage reverse osmosis device enters the second stage reverse osmosis device for further filtration. The second reverse osmosis membrane permeate is recycled as process water, and the second reverse osmosis membrane concentrate flows back to the water inlet tank of the first reverse osmosis system. A transfer tank is arranged between the reverse osmosis systems. The first-stage reverse osmosis system is provided with a first-stage reverse osmosis water inlet tank and a first-stage reverse osmosis water production tank. The second-stage reverse osmosis system is provided with a second-stage reverse osmosis system water production tank, and the first-stage reverse osmosis water production tank is used as a second-stage reverse osmosis water inlet tank. The operating pressure of the reverse osmosis system is controlled to be 1-4MPa, after the pretreated wastewater is treated by the reverse osmosis system, the TDS of the produced water of the secondary reverse osmosis is not more than 100mg/L, and the COD isCrNot more than 5 mg/L.
The first-stage reverse osmosis equipment membrane concentrated solution can be subjected to deep hardness removal and treatment of other impurity metal ions through an ion exchange resin column, and then enters an evaporation crystallization system, so that NaCl salt can be obtained, and crystals obtained can be sold as industrial salts.
The concentrated solution obtained from the microfiltration membrane can be dehydrated by adopting a filter press, the cleaning reflux of the filter press system is carried out to the microfiltration membrane system for secondary filtration, the filter press adopts a plate type or box type filter press, the filter press is intermittent pressure filtration equipment and is used for solid-liquid separation of suspended matters, the material of the filter plate is cast iron, rubber or polypropylene, the liquid flow mode is open flow or dark flow, and the operating pressure is controlled to be 0.8-2.0 MPa. The filter press has the advantages of good filtering effect, 60% of water content of the obtained solid, small occupied area of equipment and the like.
Based on above method, the utility model provides a device is shown in FIG. 1, include:
the microfiltration membrane 1 is used for filtering the metal cleaning wastewater;
the first reverse osmosis membrane 2 is connected to the permeation side of the microfiltration membrane 1 and is used for performing reverse osmosis treatment on the permeate of the microfiltration membrane 1;
the second reverse osmosis membrane 3 is connected to the permeation side of the first reverse osmosis membrane 2 and is used for performing reverse osmosis treatment on the permeate of the first reverse osmosis membrane 2; the concentration side of the second reverse osmosis membrane 3 is connected with the feed inlet of the first reverse osmosis membrane 2;
the ion exchange resin column 4 is connected to the concentration side of the first reverse osmosis membrane 2 and is used for carrying out ion exchange treatment on the concentrated solution of the first reverse osmosis membrane 2 to remove impurity metal ions;
and the evaporative crystallizer 5 is connected with a water producing port of the ion exchange resin column 4 and is used for carrying out evaporative concentration crystallization treatment on the water produced by the ion exchange resin column 4 to obtain the recovered NaCl salt.
In one embodiment, further comprising: and the cyclone separator 7 is used for performing cyclone separation treatment on the metal cleaning wastewater, the bottom of the cyclone separator is a water phase outlet, the cyclone separator is connected to the water inlet of the microfiltration membrane 1, and the top of the cyclone separator is an oil phase outlet and is connected to the biochemical treatment tank 8.
In one embodiment, the filtration pore diameter of the microfiltration membrane 1 is 0.002-0.2um, and the membrane element is in a tube type, a plate type, a disc type or a capillary type.
In one embodiment, further comprising: and the filter press 6 is connected to the concentration side of the microfiltration membrane 1 and is used for carrying out filter pressing treatment on the concentrated solution obtained from the microfiltration membrane 1 to obtain solid waste.
In one embodiment, the filter press 6 is a plate or box filter press, wherein the filter plate material used is cast iron, rubber or polypropylene.
Example 1
Metal working washing waste water containing a large amount of suspended matterAfter cyclone treatment, removing oil stains on the surface of the water phase, wherein the water phase comprises the following components: CODcr: 150mg/L, SS: 600mg/L, hardness (as CaCO)3Meter): 150mg/L, TDS: 10000 mg/L, Cl- : 6500mg/L, the wastewater automatically flows into a microfiltration membrane water inlet tank, and is pumped into a microfiltration membrane system for pretreatment by a microfiltration membrane water inlet pump. After being filtered by a microfiltration membrane, suspended matters are removed, and the filtrate is clear and transparent. The filtrate enters a first-stage reverse osmosis water inlet tank, and the concentrated solution flows back to the microfiltration membrane water inlet tank, wherein the operating pressure of the microfiltration membrane is 0.3 MPa. And (3) feeding the microfiltration membrane concentrated water into a filter press system through a pump, refluxing filter pressing clear liquid to a water inlet tank of the microfiltration membrane system, and performing filter pressing to obtain a solid filter cake with the water content of 60%. The water produced by the micro-filtration membrane is pumped into a first-stage reverse osmosis system by a reverse osmosis water inlet pump. The first-stage reverse osmosis operation pressure is 3MPa, and the temperature is not more than 40 ℃. The water produced by the first-stage reverse osmosis system enters a water production tank of the first-stage reverse osmosis system, and the concentrated water of the first-stage reverse osmosis system enters a concentrated water tank. The first-stage reverse osmosis produced water is pumped into a second-stage reverse osmosis system through a pump to be continuously filtered, the produced water of the second-stage reverse osmosis system enters a water production tank to be used as process water, the TDS (total dissolved solids) of the produced water is not more than 100mg/L, the CODcr (chemical oxygen demand) is not more than 5mg/L, and concentrated water of the second-stage reverse osmosis system flows back to a water inlet tank of the first-stage reverse osmosis system. And (3) treating the concentrated water of the primary reverse osmosis system by using sodium ion exchange resin, pumping the treated concentrated water into an evaporative crystallization system by using a concentrated water pump, and concentrating the concentrated water by using the evaporative crystallization system to obtain crystallized salt and distilled water. Distilled water is used as process water and crystalline salt is sold as industrial salt. Therefore, the system can be used for solid-liquid separation and resource utilization.
Example 2
30m high yield and high hardness (CaCO) washing waste water with suspended matter content of 580mg/L3Calculated) is 160mg/L, TDS is 8000mg/L, Cl-6500mg/L. The wastewater automatically flows into a microfiltration membrane water inlet tank, enters a microfiltration membrane system through a pump, the filtrate is placed in a microfiltration membrane water production tank, the concentrated solution enters a microfiltration membrane concentrated water tank, then a filter cake with the water content of 60% is obtained through a plate filter press, and the filtrate flows back to a ceramic membrane water inlet tank. The filtrate of the micro-filtration membrane enters a reverse osmosis system. The operating pressure is 3-4 MPa. By filtration in a two-stage reverse osmosis system, producing waterTDS is not more than 100mg/L, and CODcr is not more than 5 mg/L. And treating the concentrated solution of the first-stage reverse osmosis system by using sodium ion exchange resin, and then, allowing the treated concentrated solution to enter an evaporative crystallization system to obtain crystalline salt solids and evaporative condensed water. And (5) recycling the evaporated condensate water, and selling the crystallized salt as industrial salt. The recovery of the system was 95.7%.
Claims (6)
1. A metal processing wastewater treatment apparatus, comprising:
the microfiltration membrane (1) is used for filtering the metal cleaning wastewater;
the first reverse osmosis membrane (2) is connected to the permeation side of the microfiltration membrane (1) and is used for performing reverse osmosis treatment on the permeate of the microfiltration membrane (1);
a second reverse osmosis membrane (3) connected to the permeate side of the first reverse osmosis membrane (2) and used for performing reverse osmosis treatment on the permeate of the first reverse osmosis membrane (2); the concentration side of the second reverse osmosis membrane (3) is connected with the feed inlet of the first reverse osmosis membrane (2);
the ion exchange resin column (4) is connected to the concentration side of the first reverse osmosis membrane (2) and is used for carrying out ion exchange treatment on the concentrated solution of the first reverse osmosis membrane (2) to remove impurity metal ions;
and the evaporative crystallizer (5) is connected with a water producing port of the ion exchange resin column (4) and is used for carrying out evaporative concentration crystallization treatment on the water produced by the ion exchange resin column (4) to obtain the recovered NaCl salt.
2. The metal processing wastewater treatment apparatus according to claim 1, further comprising: and the cyclone separator (7) is used for performing cyclone separation treatment on the metal cleaning wastewater, the bottom of the cyclone separator is a water phase outlet, the cyclone separator is connected to the water inlet of the microfiltration membrane (1), and the top of the cyclone separator is an oil phase outlet and is connected to the biochemical treatment tank (8).
3. The metal processing wastewater treatment apparatus according to claim 1, wherein the filtration pore size of the microfiltration membrane (1) is 0.002 to 0.2 μm, and the membrane element is of a tubular type, a plate type, a disk type or a capillary type.
4. The metal processing wastewater treatment apparatus according to claim 1, further comprising: and the pressure filter (6) is connected to the concentration side of the microfiltration membrane (1) and is used for carrying out pressure filtration treatment on the concentrated solution obtained from the microfiltration membrane (1) to obtain solid waste residue.
5. The metal processing wastewater treatment apparatus according to claim 1, wherein the filter press (6) is a plate type or box type filter press, and the filter plate material used is cast iron, rubber or polypropylene.
6. The metal processing wastewater treatment apparatus according to claim 1, wherein the ion exchange resin column (4) is filled with a sodium type cation exchange resin.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110981061A (en) * | 2019-12-16 | 2020-04-10 | 江苏久吾高科技股份有限公司 | Method and device for treating metal processing wastewater |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110981061A (en) * | 2019-12-16 | 2020-04-10 | 江苏久吾高科技股份有限公司 | Method and device for treating metal processing wastewater |
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