CN110723784A - Wastewater treatment and recovery method - Google Patents
Wastewater treatment and recovery method Download PDFInfo
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- CN110723784A CN110723784A CN201910985699.4A CN201910985699A CN110723784A CN 110723784 A CN110723784 A CN 110723784A CN 201910985699 A CN201910985699 A CN 201910985699A CN 110723784 A CN110723784 A CN 110723784A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/14—Maintenance of water treatment installations
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/16—Regeneration of sorbents, filters
Abstract
The invention provides a wastewater treatment and recovery method, which comprises the following steps: (1) enabling the wastewater with the conductivity of 150-13000 mu s to flow into a fourth raw water tank, wherein the wastewater with the conductivity of 150-1500 mu s flows into a first raw water tank, the wastewater with the conductivity of 1001-1500 mu s flows into a second raw water tank, the wastewater with the conductivity of 1501-13000 mu s flows into a third raw water tank, and the wastewater with the conductivity of more than 13000 mu s flows into a fourth raw water tank; (2) the waste liquid of the first raw water tank flows into a raw water tank A, the waste liquid of the second raw water tank flows into a raw water tank B, and the waste liquid of the third raw water tank flows into a raw water tank C; (3) the waste liquid in the raw water tank A flows into a first ultrafiltration device and a first reverse osmosis device for treatment to obtain pure water and concentrated water; and treating the waste liquid in the raw water tank B by a second ultrafiltration device and a second reverse osmosis device to obtain pure water and concentrated water. The method can recycle the acid-washing and alkali-washing wastewater, recycle acid and alkali and part of pure water, save and utilize water resources, reduce wastewater discharge and reduce environmental pollution.
Description
Technical Field
The invention relates to the technical field of wastewater treatment and recovery, in particular to a wastewater treatment and recovery method.
Background
Along with the development of the manufacturing industry in China, the production wastewater is increased day by day, the environment is seriously polluted, in order to relieve the pressure on the environment, a series of environmental protection guidelines are formulated by the nation, wherein the discharged sewage of various industries is required to reach the discharge standard, and the development of the industries of starch sugar and derivatives thereof is more rapid. In the production process, the ion exchange resin is regenerated to generate a large amount of wastewater containing acid and alkali, the acid and alkali wastewater has strong corrosivity, contains various metal salts and organic impurities, has large sewage treatment pressure, and is mainly neutralized by acid and alkali at present, and the regenerant is degraded to reach the national discharge standard, so that the cost is high, and the production cost of the product is increased.
Therefore, it is necessary to provide a wastewater treatment and recovery method to solve the above-mentioned drawbacks.
Disclosure of Invention
The invention aims to provide a wastewater treatment and recovery method, which is used for recycling acid-washing wastewater and alkali-washing wastewater, can recycle acid, alkali and part of pure water, effectively saves and utilizes precious water resources, can reduce wastewater discharge of enterprises, reduces environmental pollution, and has obvious economic effect and environmental protection effect.
In order to achieve the above object, the present invention provides a wastewater treatment and recovery method, comprising the steps of:
(1) testing the conductivity of the wastewater by using a conductivity meter, wherein the wastewater with the conductivity of 150-;
(2) enabling waste liquid of the first raw water tank to flow into a raw water tank A, enabling waste liquid of the second raw water tank to flow into a raw water tank B, and enabling waste liquid of the third raw water tank to flow into a raw water tank C;
(3) the waste liquid in the raw water tank A flows into a first ultrafiltration device, flows into a first reverse osmosis device after being treated by the first ultrafiltration device, and is treated by the first reverse osmosis device to obtain pure water and concentrated water, wherein the pure water flows into a first pure water barrel, and the concentrated water flows into the raw water tank B; the waste liquid in the raw water tank B flows into a second ultrafiltration device, flows into a second reverse osmosis device after being treated by the second ultrafiltration device, pure water and concentrated water are obtained after being treated by the second reverse osmosis device, the pure water flows into a second pure water barrel, the concentrated water flows into the raw water tank C, and the waste liquid in the raw water tank C is gradually concentrated and recycled; wherein the water production of the first reverse osmosis unit is greater than the water production of the second reverse osmosis unit.
Compared with the prior art, the wastewater treatment and recovery method has the advantages that the wastewater is tested for the conductivity, the conductivity with different range values respectively enters the corresponding box bodies, then the first ultrafiltration device or the second ultrafiltration device is used for treatment, and macromolecular substances such as suspended matters, colloids, proteins and microorganisms in the solution are intercepted, so that the purposes of purification and separation are achieved. And then the first reverse osmosis device and the second reverse osmosis device are utilized to carry out treatment to obtain pure water and concentrated water, wherein the pure water can be used by factories, and the concentrated water is continuously recycled. The method not only effectively saves and utilizes precious water resources, but also can reduce the wastewater discharge of enterprises and reduce the environmental pollution, and has obvious economic effect and environmental protection effect.
Preferably, the wastewater treatment and recovery method further comprises a pH adjusting device for adjusting the pH of the wastewater in the raw water tank a and the raw water tank B, wherein the pH adjusting device adjusts the pH of the wastewater in the raw water tank a and the raw water tank B to be neutral.
Preferably, the pH adjusting device comprises a concentrated acid barrel, a concentrated alkali barrel and dosing devices respectively installed in the raw water tank a and the raw water tank B, and the concentrated acid barrel and the concentrated alkali barrel are respectively communicated with the raw water tank a and the raw water tank B.
Preferably, the fourth raw water tank comprises a fourth acid bucket and a fourth alkali bucket, the waste liquid of the fourth acid bucket flows into the concentrated acid bucket, and the waste liquid of the fourth alkali bucket flows into the concentrated alkali bucket.
Preferably, the wastewater treatment and recovery method further comprises a first backwashing pump connected in parallel with the first ultrafiltration device and a second backwashing pump connected in parallel with the second ultrafiltration device, the first backwashing pump pumps pure water from the first pure water tank to backwash the first ultrafiltration device, the backwashed water flows into the raw water tank B, the second backwashing pump pumps pure water from the second pure water tank to backwash the second ultrafiltration device, and the backwashed water flows into the raw water tank C.
Preferably, the wastewater treatment and recovery method further comprises a first filter, a first high-pressure pump, a second filter and a second high-pressure pump, wherein the waste liquid treated by the first ultrafiltration device flows into the first reverse osmosis device through the first filter and the first high-pressure pump in sequence; and the waste liquid treated by the second ultrafiltration device sequentially flows into a second reverse osmosis device through the second filter and the second high-pressure pump.
Preferably, the waste liquid with the conductivity less than 2500 μ s in the raw water tank C flows back to the raw water tank B through the return pipe.
Preferably, the wastewater treatment and recovery method further comprises a cleaning device, wherein the cleaning device comprises a containing barrel containing cleaning fluid, a delivery pump and a filtering device, a water outlet of the filtering device is communicated with a water inlet of the device to be cleaned, and a water outlet of the device to be cleaned is communicated with a water inlet of the containing barrel.
Preferably, the cleaning solution is selected from one of a cleaning solution a, a cleaning solution B and a cleaning solution C, wherein:
the cleaning solution A comprises 8 parts of citric acid and 1000 parts of water, and the pH value is adjusted to 3 by adopting hydrochloric acid;
the cleaning solution B comprises 8 parts of sodium tripolyphosphate, 4 parts of EDTA sodium salt and 1000 parts of water, and the pH value is adjusted to 11 by adopting sodium hydroxide;
the cleaning solution C comprises 8 parts of sodium tripolyphosphate, 1 part of sodium dodecyl benzene sulfonate and 1000 parts of water, and the pH value is adjusted to 11 by adopting sodium hydroxide
Preferably, scale inhibitors and sodium bisulfite are added periodically to the first and second reverse osmosis units.
Drawings
FIG. 1 is a schematic view of the wastewater treatment and recovery process of the present invention.
Detailed Description
In order to explain technical contents, structural features, and effects of the present invention in detail, the following detailed description is given with reference to the embodiments and the accompanying drawings.
Referring to fig. 1, a schematic flow chart of a wastewater treatment and recovery process of the present invention is shown, wherein the wastewater treatment and recovery method comprises the steps of:
(1) the conductivity of the wastewater is tested by adopting a conductivity meter, the wastewater with the conductivity of 150-;
(2) the waste liquid in the first raw water tank 10 flows into the raw water tank A14, the waste liquid in the second raw water tank 11 flows into the raw water tank B15, and the waste liquid in the third raw water tank 12 flows into the raw water tank C16;
(3) the waste liquid in the raw water tank A14 flows into the first ultrafiltration device 21, flows into the first reverse osmosis device 23 after being treated by the first ultrafiltration device 21, and is treated by the first reverse osmosis device 23 to obtain pure water and concentrated water, wherein the pure water flows into the first pure water barrel 17, and the concentrated water flows into the raw water tank B15; the waste liquid in the raw water tank B15 flows into the second ultrafiltration device 31, flows into the second reverse osmosis device 33 after being treated by the second ultrafiltration device 31, pure water and concentrated water are obtained after being treated by the second reverse osmosis device 33, the pure water flows into the second pure water barrel 18, the concentrated water flows into the raw water tank C16, and the waste liquid in the raw water tank C16 is gradually concentrated and recycled; wherein the water production of the first reverse osmosis unit 23 is greater than the water production of the second reverse osmosis unit 33.
The waste water is pickling waste liquid or alkaline washing waste liquid, and is provided with a pickling waste liquid inlet pipeline 60 and an alkaline washing waste liquid inlet pipeline 63, an online detection conductivity meter and an electric valve 70 are arranged in pipelines of the pickling waste liquid inlet pipeline 60 and the alkaline washing waste liquid inlet pipeline 63, the online detection conductivity meter is used for testing the conductivity of the waste water, and the electric valve 70 is correspondingly and automatically opened according to a set conductivity value, so that the waste water enters the corresponding first raw water tank 10, the second raw water tank 11, the third raw water tank 12 or the fourth raw water tank 13. The first ultrafiltration device 21 and the second ultrafiltration device 31 comprise ultrafiltration membranes, which only allow solvents (such as water molecules), inorganic salts and small molecular organic matters in the solution to permeate through, and retain suspended substances, colloids, proteins, microorganisms and other macromolecular substances in the solution, thereby achieving the purposes of purification and separation. The first reverse osmosis unit 23 and the second reverse osmosis unit 33 comprise reverse osmosis membranes, and water molecules are forced to permeate through the reverse osmosis membranes having selective permeation of water molecules by pressure. In this embodiment, the water yield of the first reverse osmosis device 23 is 5T/H, and the water yield of the second reverse osmosis device 33 is 3T/H, but not limited thereto.
In the preferred embodiment, before the wastewater enters the first ultrafiltration device 21 and the second ultrafiltration device 31, the wastewater in the raw water tank A14 and the raw water tank B15 is subjected to pH adjustment by using a pH adjusting device, and the wastewater in the raw water tank A14 and the raw water tank B15 is adjusted to be neutral by the pH adjusting device. Specifically, the pH adjusting device comprises a concentrated acid barrel 41, a concentrated alkali barrel 43 and dosing devices respectively installed in a raw water tank a14 and a raw water tank B15, wherein the concentrated acid barrel 41 and the concentrated alkali barrel 43 are respectively communicated with the raw water tank a14 and the raw water tank B15. Each water tank can be provided with a conductivity meter and a pH meter, pH regulator is added from the medicine adding device, and acid and alkali can be extracted from the concentrated acid barrel 41 and the concentrated alkali barrel 43 by the medicine adding pump for pH regulation, and the specific acid and alkali extraction can be carried out according to actual conditions, which is not described in detail herein. Further, the fourth raw water tank 13 includes a fourth acid bucket 131 and a fourth alkali bucket 133, and the waste liquid of the fourth acid bucket 131 flows into the concentrated acid bucket 41, and the waste liquid of the fourth alkali bucket 133 flows into the concentrated alkali bucket 43, so as to achieve full recycling.
With continued reference to fig. 1, the wastewater treatment and recovery method further comprises a first backwashing pump 25 connected in parallel with the first ultrafiltration device 21 and a second backwashing pump 35 connected in parallel with the second ultrafiltration device 31, wherein the first backwashing pump 25 pumps pure water from the first pure water tank 17 to backwash the first ultrafiltration device 21, the backwashed water flows into the raw water tank B15, the second backwashing pump 35 pumps pure water from the second pure water tank 18 to backwash the second ultrafiltration device 31, and the backwashed water flows into the raw water tank C16. Every time first ultrafiltration device 21 and second ultrafiltration device 31 operate for a period of time, draw the pure water from first pure water bucket 17 by first backwash pump 25 and carry out the backwash to first ultrafiltration device 21, the system does not produce water during the backwash, the rivers of backwash flow into former water tank B15, second backwash pump 35 extracts the pure water from second pure water bucket 18 and carries out the backwash to second ultrafiltration device 31, the rivers of backwash flow into former water tank C16, can guarantee the cleanness of milipore filter, and the efficiency of treatment and effect are improved.
With continued reference to fig. 1, the wastewater treatment and recovery method further comprises a first filter 27, a first high-pressure pump 29, a second filter 37 and a second high-pressure pump 39, wherein the waste liquid treated by the first ultrafiltration device 21 flows into the first reverse osmosis device 23 through the first filter 27 and the first high-pressure pump 29 in sequence; the waste liquid treated by the second ultrafiltration device 31 flows into the second reverse osmosis device 33 through a second filter 37 and a second high-pressure pump 39 in sequence. After the waste liquid in the raw water tank a14 is conveyed to the first ultrafiltration device 21 by the pump, the first filter 27 can intercept large particulate matters which may exist, and the service life of the first reverse osmosis device 23 is prolonged. After the waste liquid in the raw water tank B15 is pumped to the second ultrafiltration device 31, the second filter 37 can intercept large particulate matters which may exist, and the service life of the second reverse osmosis device 33 is prolonged. The first and second high pressure pumps 29 and 39 increase the flow rate of the water, increasing the treatment rate of the first and second reverse osmosis devices 23 and 33.
With continued reference to fig. 1, the waste liquid with conductivity less than 2500 μ s in the raw water tank C16 is returned to the raw water tank B15 through the return pipe 65, thereby reducing the loss of the waste liquid. When the conductivity of the waste liquid in the raw water tank C16 is larger than 13000 mus, the waste liquid is sent out by the water return pump 71, thereby realizing gradual concentration and recycling of the waste liquid in the raw water tank C16.
With continued reference to fig. 1, the wastewater treatment and recovery method further comprises a cleaning device 50, wherein the cleaning device 50 comprises a containing barrel 51 containing cleaning fluid, a delivery pump 53 and a filtering device 55, a water outlet of the filtering device 55 is communicated with a water inlet of the device to be cleaned, and a water outlet of the device to be cleaned is communicated with a water inlet of the containing barrel 51. For example, the first reverse osmosis device 23 needs to be cleaned, the whole system stops operating, the corresponding valve is closed, the water outlet of the filtering device 55 is communicated with the water inlet of the first reverse osmosis device 23, the water outlet of the first reverse osmosis device 23 is communicated with the water inlet of the container 51, and the delivery pump 53 is started to perform circular cleaning. The cleaning of the remaining apparatus is the same as in the above-described embodiment, and will not be described in detail here. Because the membrane pollutants have large differences with different water sources, the accumulated pollutants are usually one or more of colloid, mixed colloid, metal chloride, micro-dissolved salt, bacteria debris and the like. Therefore, different cleaning liquids are required for cleaning. Specifically, the cleaning liquid is selected from one of a cleaning liquid a, a cleaning liquid B and a cleaning liquid C, wherein: the cleaning solution A comprises 8 parts of citric acid and 1000 parts of water, and the pH value is adjusted to 3 by adopting hydrochloric acid; the cleaning solution B comprises 8 parts of sodium tripolyphosphate, 4 parts of EDTA sodium salt and 1000 parts of water, and the pH value is adjusted to 11 by adopting sodium hydroxide; the cleaning solution C comprises 8 parts of sodium tripolyphosphate, 1 part of dodecyl benzene sulfonate and 1000 parts of water, and the pH value is adjusted to 11 by adopting sodium hydroxide. When the waste water contains more metal oxides (iron, copper, nickel and the like), cleaning is carried out by using a cleaning solution A after a period of treatment. When the wastewater contains a large amount of various colloids (organic matter and colloidal silica), the wastewater is treated for a period of time and then is cleaned by cleaning fluid B. When the wastewater contains organic matters and precipitates, cleaning liquid B is adopted for cleaning after a period of treatment. Further, in order to improve the treatment efficiency and effect of the first and second reverse osmosis units 23 and 33, scale inhibitors and sodium bisulfite are periodically added to the first and second reverse osmosis units 23 and 33. The scale inhibitor can effectively prevent calcium and magnesium ions in water from scaling on the membrane surfaces of the first reverse osmosis device 23 and the second reverse osmosis device 33, effectively protect the membrane group and prolong the service life of the membrane group. In this embodiment, the scale inhibitor is of the type Rohm and Haas 4035, but not limited thereto. The sodium bisulfite can prevent the membranes of the first reverse osmosis device 23 and the second reverse osmosis device 33 from being damaged by the oxidant, and the service life of the reverse osmosis device is prolonged.
The above disclosure is only a preferred embodiment of the present invention, which is convenient for those skilled in the art to understand and implement, and certainly not to limit the scope of the present invention, therefore, the present invention is not limited by the claims and their equivalents.
Claims (10)
1. A wastewater treatment and recovery method is characterized by comprising the following steps:
(1) testing the conductivity of the wastewater by using a conductivity meter, wherein the wastewater with the conductivity of 150-;
(2) enabling waste liquid of the first raw water tank to flow into a raw water tank A, enabling waste liquid of the second raw water tank to flow into a raw water tank B, and enabling waste liquid of the third raw water tank to flow into a raw water tank C;
(3) the waste liquid in the raw water tank A flows into a first ultrafiltration device, flows into a first reverse osmosis device after being treated by the first ultrafiltration device, and is treated by the first reverse osmosis device to obtain pure water and concentrated water, wherein the pure water flows into a first pure water barrel, and the concentrated water flows into the raw water tank B; the waste liquid in the raw water tank B flows into a second ultrafiltration device, flows into a second reverse osmosis device after being treated by the second ultrafiltration device, pure water and concentrated water are obtained after being treated by the second reverse osmosis device, the pure water flows into a second pure water barrel, the concentrated water flows into the raw water tank C, and the waste liquid in the raw water tank C is gradually concentrated and recycled; wherein the water production of the first reverse osmosis unit is greater than the water production of the second reverse osmosis unit.
2. The method for treating and recycling wastewater according to claim 1, further comprising a pH adjusting device for adjusting pH of wastewater in the raw water tank A and the raw water tank B, wherein the pH adjusting device adjusts the wastewater in the raw water tank A and the raw water tank B to be neutral.
3. The wastewater treatment and recovery method according to claim 2, wherein the pH adjusting device comprises a concentrated acid tank, a concentrated alkali tank and a chemical adding device respectively installed in the raw water tank A and the raw water tank B, and the concentrated acid tank and the concentrated alkali tank are respectively communicated with the raw water tank A and the raw water tank B.
4. The wastewater treatment and recovery method of claim 3, wherein the fourth raw water tank comprises a fourth acid tank and a fourth alkali tank, the waste liquid of the fourth acid tank flows into the concentrated acid tank, and the waste liquid of the fourth alkali tank flows into the concentrated alkali tank.
5. The wastewater treatment and recovery method according to claim 1, further comprising a first backwash pump connected in parallel to the first ultrafiltration device and a second backwash pump connected in parallel to the second ultrafiltration device, wherein the first backwash pump pumps pure water from the first pure water tank to backwash the first ultrafiltration device, backwashed water flows into the raw water tank B, the second backwash pump pumps pure water from the second pure water tank to backwash the second ultrafiltration device, and backwashed water flows into the raw water tank C.
6. The wastewater treatment and recovery method of claim 1, further comprising a first filter, a first high-pressure pump, a second filter and a second high-pressure pump, wherein the waste liquid treated by the first ultrafiltration device flows into the first reverse osmosis device through the first filter and the first high-pressure pump in sequence; and the waste liquid treated by the second ultrafiltration device sequentially flows into a second reverse osmosis device through the second filter and the second high-pressure pump.
7. The wastewater treatment and recovery method according to claim 1, wherein the waste water having an electrical conductivity of less than 2500 μ s in the raw water tank C is returned to the raw water tank B through a return pipe.
8. The wastewater treatment and recovery method of claim 1, further comprising a cleaning device, wherein the cleaning device comprises a containing barrel containing the cleaning solution, a delivery pump and a filtering device, a water outlet of the filtering device is communicated with a water inlet of the device to be cleaned, and a water outlet of the device to be cleaned is communicated with a water inlet of the containing barrel.
9. The wastewater treatment recovery method according to claim 8, wherein the cleaning solution is one selected from the group consisting of cleaning solution a, cleaning solution B and cleaning solution C, wherein:
the cleaning solution A comprises 8 parts of citric acid and 1000 parts of water, and the pH value is adjusted to 3 by adopting hydrochloric acid;
the cleaning solution B comprises 8 parts of sodium tripolyphosphate, 4 parts of EDTA sodium salt and 1000 parts of water, and the pH value is adjusted to 11 by adopting sodium hydroxide;
the cleaning solution C comprises 8 parts of sodium tripolyphosphate, 1 part of sodium dodecyl benzene sulfonate and 1000 parts of water, and the pH value is adjusted to 11 by adopting sodium hydroxide.
10. The wastewater treatment recovery method of claim 1, wherein scale inhibitor and sodium bisulfite are added to the first reverse osmosis unit and the second reverse osmosis unit periodically.
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