CN114920409A - Zero-emission treatment system and method for nitrogen and phosphorus-containing wastewater of automobile part factory - Google Patents
Zero-emission treatment system and method for nitrogen and phosphorus-containing wastewater of automobile part factory Download PDFInfo
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- C02F9/00—Multistage treatment of water, waste water or sewage
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/041—Treatment of water, waste water, or sewage by heating by distillation or evaporation by means of vapour compression
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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- C02F2001/5218—Crystallization
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
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- C02F2101/105—Phosphorus compounds
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
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- C02F2101/38—Organic compounds containing nitrogen
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/02—Softening water by precipitation of the hardness
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
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Abstract
The invention belongs to the technical field of wastewater treatment, and particularly relates to a zero-emission treatment system and method for nitrogen-phosphorus-containing wastewater of an automobile part factory. The treatment system comprises a sewage pool, a softening unit, a filter membrane solid-liquid separation unit, a reverse osmosis water treatment unit, a pipe network type reverse osmosis unit, a mechanical steam recompression unit, a sludge treatment unit, a reuse water pool and a crystallized salt recovery unit. The invention adopts a means of combining a plurality of treatment modes, the treatment modes are safe and efficient, the treated effluent can stably reach the zero discharge standard of the wastewater containing nitrogen and phosphorus, and simultaneously, the water waste caused by the discharge of water is avoided.
Description
Technical Field
The invention belongs to the technical field of wastewater treatment, and particularly relates to a zero-emission treatment system and method for nitrogen-phosphorus-containing wastewater of an automobile part factory.
Background
In order to promote the coordinated development of industrial economy, water resources and environment, in recent years, the requirements for developing the recycling of discharged wastewater and zero emission technology are higher and higher, for example, wastewater recycling is promoted in key industries such as steel, electric power, chemical industry and coal, and the aim of realizing less or zero emission of wastewater is fulfilled.
Degreasing wastewater, phosphating wastewater, pickling wastewater and the like generated in a coating workshop of a part factory in the automobile industry contain high nitrogen and phosphorus pollutants. At present, the process for treating the wastewater in the Taihu river basin is mainly discharged. The wastewater is collected independently and treated independently, and is treated and purified layer by layer, part of the wastewater is recycled after treatment, and part of the wastewater is guaranteed that nitrogen and phosphorus pollutants cannot be detected in a discharged water body, so that the requirement of discharge is met, and the purpose of discharging the nitrogen and phosphorus-containing wastewater is achieved. Although the process meets the policy requirements, the zero emission of nitrogen and phosphorus pollutants is only ensured, but the zero emission of wastewater is not. By zero emission is meant the activity of reducing pollutant and energy emissions indefinitely until it reaches zero. And the process still has the following problems in the practical engineering implementation: (1) the concentration of the discharged wastewater is low and cannot be detected, that is, the discharged wastewater does not contain nitrogen and phosphorus pollutants and is limited by the precision of an under-eye detection instrument; (2) the parameter fluctuation in the actual system operation can generate the risk of exceeding the standard of water quality; (3) water is discharged outside, and water resource waste is caused.
Disclosure of Invention
The invention provides a zero-emission treatment system and a zero-emission treatment method for nitrogen and phosphorus-containing wastewater of an automobile part factory, aiming at avoiding the defects and risks of the conventional process at present and achieving the purpose of zero emission of the nitrogen and phosphorus-containing wastewater by using the safest treatment process.
According to the technical scheme, the zero-emission treatment system for nitrogen and phosphorus-containing wastewater of the automobile part factory comprises a sewage pool, a softening unit, a filter membrane solid-liquid separation unit (TMF unit), a reverse osmosis water treatment unit (RO unit), a pipe network type reverse osmosis unit (STRO unit), a mechanical vapor recompression unit (MVR unit), a sludge treatment unit, a reuse water pool and a crystallized salt recovery unit;
the softening unit comprises a dosing device and a coagulation and flocculation tank, a water inlet of the coagulation and flocculation tank is connected with a sewage tank, a sludge discharge port of the coagulation and flocculation tank is connected with a sludge treatment unit, and a water outlet of the coagulation and flocculation tank is connected with a water inlet of the filter membrane solid-liquid separation unit; the water outlet of the filter membrane solid-liquid separation unit is connected with the water inlet of the reverse osmosis water treatment unit, and the sludge discharge port of the filter membrane solid-liquid separation unit is connected with the sludge treatment unit; a concentrated water outlet of the reverse osmosis water treatment unit is connected with a water inlet of the net type reverse osmosis unit, and a clear water outlet of the reverse osmosis water treatment unit is connected with a reuse water pool; the concentrated water outlet of the pipe network type reverse osmosis unit is connected with the mechanical vapor recompression unit, and the clear water outlet of the pipe network type reverse osmosis unit is connected with a reuse water pool; the water outlet of the mechanical vapor recompression unit is connected with a reuse water pool, and the precipitation outlet of the mechanical vapor recompression unit is connected with a crystallization salt recovery unit.
Furthermore, the softening unit is divided into four parts with communicated inner parts, and each part is respectively connected with the dosing device.
Furthermore, an outlet of the crystallized salt recovery unit is provided with a crystallized salt treatment device.
The invention also provides a zero-emission treatment method of nitrogen and phosphorus-containing wastewater in an automobile part factory, which adopts the zero-emission treatment system and comprises the following steps,
s1: nitrogen and phosphorus containing wastewater of automobile part factories enters a softening unit, coagulation flocculation reaction is carried out under the action of a flocculating agent to remove calcium and magnesium ions, and precipitates generated by the coagulation flocculation reaction enter a sludge treatment unit;
s2: the treated effluent of the softening unit enters a filter membrane solid-liquid separation unit to remove suspended matters, and the removed suspended matters form precipitates and enter a sludge treatment unit;
s3: the treated effluent of the filter membrane solid-liquid separation unit enters a reverse osmosis water treatment unit for reverse osmosis treatment, concentrated water with higher salt content is obtained by concentration, and the residual concentrated clear water enters a reuse water pool;
s4: the concentrated water of the reverse osmosis water treatment unit enters a pipe network type reverse osmosis unit for reverse osmosis treatment, concentrated water with higher salinity is obtained by concentration, and the residual concentrated clear water enters a reuse water pool;
s5: concentrated water of the pipe network type reverse osmosis unit enters a mechanical steam recompression unit to be subjected to mechanical steam recompression, the obtained crystallized salt enters a crystallized salt recovery unit, and clear water enters a reuse water pool.
After the treatment by the method, pollutants such as phosphate, nitrate nitrogen, ammonia nitrogen, other salts and the like contained in the wastewater containing nitrogen and phosphorus are evaporated into crystal salt, condensed water and produced water of each system are collected and input into a reuse water pool, and the method can be used for flushing toilets and greening in plants.
Further, the flocculant comprises NaOH and NaCO 3 PAC (polyaluminium chloride) and PAM (polyacrylamide).
Further, in the step S1, the total reaction time of the nitrogen and phosphorus-containing wastewater of the automobile part factory in the softening unit is 60-80min, and after mud-water separation, the removal rate of calcium and magnesium ions in water exceeds 98%.
Further, in the step S2, the operating pressure of the membrane solid-liquid separation unit is 0.4-0.5MPa, and the removal rate of calcium and magnesium ions in water exceeds 98% after mud-water separation.
Further, in step S3, the operating pressure of the reverse osmosis water treatment unit is 1.0 to 1.5MPa, and the water yield is not less than 70%. Compared with the raw water, the water quantity of the concentrated water is reduced by 70 percent, and the salt concentration in the water is nearly 3 times.
Further, in the step S4, the operation pressure of the pipe network type reverse osmosis unit is 7-8MPa, and the water yield is 70%. Compared with the original water, the water quantity of the concentrated water is reduced by 90%, and the salinity concentration in the water is approximately 10 times.
Compared with the prior art, the technical scheme of the invention has the following advantages: the invention adopts a means of combining a plurality of treatment modes, the treatment modes are safe and efficient, the treated effluent can stably reach the zero discharge standard of the wastewater containing nitrogen and phosphorus, and simultaneously, the water waste caused by the discharge of water is avoided.
Drawings
Fig. 1 is a schematic structural view of a zero-discharge treatment system for nitrogen-phosphorus-containing wastewater of an automobile part plant in example 1.
Fig. 2 is a flowchart of a zero-discharge treatment method of nitrogen-phosphorus-containing wastewater of an automobile part plant in example 2.
Description of reference numerals:
1-a sewage tank, 2-a coagulation flocculation tank, 3-a filter membrane solid-liquid separation unit, 4-a reverse osmosis water treatment unit, 5-a pipe network type reverse osmosis unit, 6-a mechanical vapor recompression unit, 8-a sludge treatment unit, 9-a reuse water tank, 7-a crystallized salt recovery unit and 10-a dosing device.
Detailed Description
The present invention is further described below in conjunction with the following figures and specific examples so that those skilled in the art may better understand the present invention and practice it, but the examples are not intended to limit the present invention.
Example 1
As shown in fig. 1: the zero-emission treatment system for nitrogen-phosphorus-containing wastewater of an automobile part factory comprises a sewage tank 1, a softening unit, a filter membrane solid-liquid separation unit 3, a reverse osmosis water treatment unit 4, a pipe network type reverse osmosis unit 5, a mechanical steam recompression unit 6, a sludge treatment unit 8, a reuse tank 9 and a crystallized salt recovery unit 7.
The softening unit comprises a dosing device 10 and a coagulation and flocculation tank 2, a water inlet of the coagulation and flocculation tank 2 is connected with a sewage tank 1, a sludge discharge port of the coagulation and flocculation tank 2 is connected with a sludge treatment unit 8, and a water outlet of the coagulation and flocculation tank 2 is connected with a water inlet of a filter membrane solid-liquid separation unit 3; the water outlet of the filter membrane solid-liquid separation unit 3 is connected with the water inlet of the reverse osmosis water treatment unit 4, and the sludge discharge port of the filter membrane solid-liquid separation unit 3 is connected with the sludge treatment unit 8; a concentrated water outlet of the reverse osmosis water treatment unit 4 is connected with a water inlet of the net type reverse osmosis unit 5, and a clear water outlet of the reverse osmosis water treatment unit 4 is connected with a reuse water pool 9; a concentrated water outlet of the pipe network type reverse osmosis unit 5 is connected with the mechanical vapor recompression unit 6, and a clear water outlet of the pipe network type reverse osmosis unit 5 is connected with a reuse water pool 9; the water outlet of the mechanical vapor recompression unit 6 is connected with a reuse water pool 9, and the precipitation outlet of the mechanical vapor recompression unit 6 is connected with a crystallization salt recovery unit 7.
Example 2 zero discharge treatment of nitrogen and phosphorus-containing wastewater of automobile parts factory
The water quality of concentrated water obtained after the wastewater containing nitrogen and phosphorus passes through an RO system for a certain automobile part factory in Suzhou is as follows: TDS (total dissolved solids) is less than or equal to 4000mg/L, COD (chemical oxygen demand) is less than or equal to 100mg/L, ammonia nitrogen is less than or equal to 30mg/L, total phosphorus is less than or equal to 8mg/L, and hardness is less than or equal to 1000 mg/L.
Waste water (RO concentrated water) containing nitrogen and phosphorus of an automobile part factory enters a softening unit, alkali liquor is added into a first grid to pre-adjust the pH value, the pH value is adjusted to 9-10, and a solution agent is added to prepare the concentration of 30%; adding sodium carbonate into the second grid, and reacting with calcium and magnesium ions of the wastewater under an alkaline condition to generate precipitate calcium carbonate and magnesium carbonate; and an inorganic flocculant PAC is added into the third grid, so that the ion concentration in the wastewater is increased, and the thickness of a diffusion layer is reduced. The solid micro particles on the surface can be rapidly condensed to form larger solid particles which are easy to precipitate; the fourth polymeric organic flocculant (PAM) can enable larger solid particles to be flocculated into clusters rapidly. And the fourth grid of effluent is connected with the TMF unit, TMF produced water enters the RO unit, and generated sludge is discharged to the sludge disposal unit of the original sewage station. After passing through the unit, the removal rate of calcium and magnesium ions reaches 98%, and the hardness of water produced by the TMF unit is less than 20 mg/L.
The produced water of the TMF unit enters a reverse osmosis unit and passes through an RO unit and an STRO unit, wherein the running pressure of the RO unit reaches 1.5MPa, and the running pressure of the STRO reaches 8.0 MPa. The running cost of the RO unit is 1.5 yuan/ton, and the running cost of the STRO unit is 12.0 yuan/ton. The compressed concentrated water enters an MVR unit, the water amount is reduced to 10% of the original water amount, and the concentration of each pollutant in the water is as follows: ammonia nitrogen: 200 mg/L; COD: 1000 mg/L; and SS: 50 mg/L; hardness: 200 mg/L; TDS: 40000 mg/L. The produced water is discharged into a reuse water pool, and the water production rate reaches 90 percent. The water quality meets the following standards: pH: 6-9, BOD 5: less than or equal to 10mg/L, turbidity: 5 or less, anionic surfactant: less than or equal to 0.5mg/L, iron: less than or equal to 0.3mg/L, manganese: less than or equal to 0.1mg/L, dissolved oxygen: not less than 1.0mg/L, ammonia nitrogen not more than 10mg/L, total residual chlorine: the total coliform number is more than or equal to 1.0mg/L after 30min of contact, the tail end of a pipe network is more than or equal to 0.2 mg/L: less than or equal to 3/L, chroma: less than or equal to 30; can be used for flushing toilet and greening in factory.
The compressed concentrated water enters the evaporation unit, and a Mechanical Vapor Recompression (MVR) evaporator is adopted, so that more than 80% of energy is saved, more than 90% of condensed water is saved, and more than 50% of occupied area is reduced compared with a conventional evaporator. After the treatment by the process, the crystal salt with the raw water content of about 0.5 percent can be obtained, and the cooling water is discharged into a reuse water pool for reuse.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the spirit or scope of the invention.
Claims (10)
1. A zero-emission treatment system for nitrogen and phosphorus-containing wastewater of an automobile part factory is characterized by comprising a sewage tank, a softening unit, a filter membrane solid-liquid separation unit, a reverse osmosis water treatment unit, a pipe network type reverse osmosis unit, a mechanical steam recompression unit, a sludge treatment unit, a reuse water tank and a crystallized salt recovery unit;
the softening unit comprises a dosing device and a coagulation and flocculation tank, a water inlet of the coagulation and flocculation tank is connected with a sewage tank, a sludge discharge port of the coagulation and flocculation tank is connected with a sludge treatment unit, and a water outlet of the coagulation and flocculation tank is connected with a water inlet of the filter membrane solid-liquid separation unit; the water outlet of the filter membrane solid-liquid separation unit is connected with the water inlet of the reverse osmosis water treatment unit, and the sludge discharge port of the filter membrane solid-liquid separation unit is connected with the sludge treatment unit; a concentrated water outlet of the reverse osmosis water treatment unit is connected with a water inlet of the net type reverse osmosis unit, and a clear water outlet of the reverse osmosis water treatment unit is connected with a reuse water pool; the concentrated water outlet of the pipe network type reverse osmosis unit is connected with the mechanical vapor recompression unit, and the clear water outlet of the pipe network type reverse osmosis unit is connected with a reuse water pool; and a water outlet of the mechanical vapor recompression unit is connected with a reuse water pool, and a precipitation outlet of the mechanical vapor recompression unit is connected with a crystallization salt recovery unit.
2. The zero-emission treatment system for nitrogen-phosphorus-containing wastewater in an automobile part factory as claimed in claim 1, wherein the softening unit is divided into four parts with communicated interiors, and each part is connected with the dosing device.
3. The zero-emission treatment system for nitrogen-phosphorus-containing wastewater of an automobile part factory as claimed in claim 1, wherein an outlet of the crystallized salt recovery unit is provided with a crystallized salt treatment device.
4. A zero-discharge treatment method of nitrogen and phosphorus-containing wastewater of an automobile part factory, which is characterized in that the zero-discharge treatment system of claim 1 is adopted, and comprises the following steps,
s1: nitrogen and phosphorus-containing wastewater of an automobile part factory enters a softening unit, a coagulation flocculation reaction is carried out under the action of a flocculating agent to remove calcium and magnesium ions, and precipitates generated by the coagulation flocculation reaction enter a sludge treatment unit;
s2: the treated effluent of the softening unit enters a filter membrane solid-liquid separation unit to remove suspended matters, and the removed suspended matters form precipitates and enter a sludge treatment unit;
s3: the treated effluent of the filter membrane solid-liquid separation unit enters a reverse osmosis water treatment unit for reverse osmosis treatment, concentrated water with higher salt content is obtained by concentration, and the residual concentrated clear water enters a reuse water pool;
s4: the concentrated water of the reverse osmosis water treatment unit enters a pipe network type reverse osmosis unit for reverse osmosis treatment, concentrated water with higher salinity is obtained by concentration, and the residual concentrated clear water enters a reuse water pool;
s5: concentrated water of the pipe network type reverse osmosis unit enters a mechanical steam recompression unit to be subjected to mechanical steam recompression, the obtained crystallized salt enters a crystallized salt recovery unit, and clear water enters a reuse water pool.
5. The method for zero discharge of nitrogen and phosphorus containing wastewater of automobile part factory as claimed in claim 4, wherein said flocculant comprises NaOH, NaCO 3 PAC and PAM.
6. The method for zero-emission treatment of wastewater containing nitrogen and phosphorus in an automobile parts factory as set forth in claim 4, wherein in step S1, the pH in the softening unit is 9-11.
7. The method for zero-emission treatment of nitrogen-and phosphorus-containing wastewater of an automobile parts plant as claimed in any one of claims 3 to 6, wherein in the step S1, the total reaction time of the nitrogen-and phosphorus-containing wastewater of the automobile parts plant in the softening unit is 60-80 min.
8. The method for zero discharge of wastewater containing nitrogen and phosphorus in an automobile parts factory as set forth in claim 4, wherein in step S2, the operation pressure of the membrane solid-liquid separation unit is 0.4-0.5 MPa.
9. The method for zero discharge of wastewater containing nitrogen and phosphorus in an automobile parts plant as set forth in claim 4, wherein in step S3, the operating pressure of the reverse osmosis water treatment unit is 1.0-1.5 MPa.
10. The method for zero-emission treatment of nitrogen-and phosphorus-containing wastewater of an automobile parts factory as set forth in claim 4, wherein in step S4, the operation pressure of the pipe-network type reverse osmosis unit is 7-8 MPa.
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