CN215480160U - Concentrated decrement zero discharge processing apparatus of desulfurization waste water integrates - Google Patents
Concentrated decrement zero discharge processing apparatus of desulfurization waste water integrates Download PDFInfo
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- CN215480160U CN215480160U CN202023007521.XU CN202023007521U CN215480160U CN 215480160 U CN215480160 U CN 215480160U CN 202023007521 U CN202023007521 U CN 202023007521U CN 215480160 U CN215480160 U CN 215480160U
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Abstract
The utility model provides an integrated desulfurization wastewater concentration decrement zero-emission treatment device, which comprises a softening and hardness-removing adsorption treatment unit, a tubular microfiltration membrane system, a nanofiltration system and a reverse osmosis unit which are sequentially connected through pipelines; the softening and hard-removing adsorption treatment unit comprises a reaction tank and a concentration tank; the tubular microfiltration membrane system adopts an internal pressure cross-flow type filtration membrane; the nanofiltration membrane system is a pressure-driven membrane separation process; the reverse osmosis unit comprises a first-stage reverse osmosis system, a high-pressure reverse osmosis system and a second-stage reverse osmosis system, wherein the high-pressure reverse osmosis system is used for treating concentrated water of the first-stage reverse osmosis. All the processing units are integrated into a process, a set of system and a box body, so that the process flow is smooth, the automation degree is high, the occupied area is small, the transportation is convenient, the flexible application is realized, and the like.
Description
Technical Field
The utility model belongs to the technical field of desulfurization wastewater treatment of thermal power plants, and relates to an integrated desulfurization wastewater concentration, decrement and zero emission treatment device.
Background
The consumption and the discharge of water resources of a thermal power plant are large, wherein impurities contained in the desulfurization wastewater by the limestone-gypsum method mainly comprise suspended matters, supersaturated sulfite, sulfate, mercury, copper and other heavy metals, and most of the impurities are first pollutants which are strictly controlled in the national environmental protection standard. If the desulfurization waste water is directly discharged without being treated, serious pollution is caused to the surrounding water environment. The traditional triple box type desulfurization wastewater treatment technology has large floor area, high content of suspended matters in the desulfurization wastewater, no precipitation link after neutralization reaction, large amount of suspended matters greatly influence subsequent process equipment, and the suspended matters in the effluent hardly reach the discharge standard. And the discharge amount of the desulfurization wastewater is small, a common triple box treatment process has certain defects in the aspects of treatment effect, occupied area, running cost and the like, and part of enterprises are intermittent production enterprises, and the permanent investment does not accord with the development of the enterprises.
Disclosure of Invention
Aiming at the defects, the utility model provides an integrated desulfurization wastewater concentration and decrement zero-emission treatment device which can effectively overcome the defects in the traditional desulfurization wastewater treatment process.
The technical scheme of the utility model is as follows: an integrated desulfurization wastewater concentration and decrement zero-emission treatment device comprises a softening and hard-removal adsorption treatment unit, a tubular microfiltration membrane system, a nanofiltration system and a reverse osmosis unit which are sequentially connected through pipelines;
the softening and hard-removing adsorption treatment unit comprises a reaction tank and a concentration tank;
the tubular microfiltration membrane system adopts an internal pressure cross-flow type filtration membrane;
the nanofiltration system is a pressure-driven membrane separation process;
the reverse osmosis unit comprises a primary reverse osmosis system, a high-pressure reverse osmosis system and a secondary reverse osmosis system, the primary reverse osmosis system is used for treating nanofiltration produced water and concentrated water of the secondary reverse osmosis system, and the secondary reverse osmosis system is used for treating the concentrated water of the primary reverse osmosis system and the high-pressure reverse osmosis system; the high-pressure reverse osmosis system is used for treating concentrated water of primary reverse osmosis.
The concentration tank is connected with a sludge pool, waste obtained after the treatment of the concentration tank enters the sludge pool, the waste is treated by a filter press after the precipitation, filtrate enters the softening and hardness-removing adsorption treatment unit for retreatment, and the sludge is discharged and transported outside.
Further, a concentrated decrement zero discharge treatment device of desulfurization waste water integrates, dense water backward flow after the tubular micro-filtration system handles is handled again to softening and removing hard absorption processing unit.
Further, the wastewater passes through a homogenizing adjusting tank before entering the treatment device.
Furthermore, the reaction tank adopts a chemical softening method, namely NaOH, a magnesium agent and Na2CO3 are added into the reaction tank.
Furthermore, the device for concentration, decrement and zero-emission treatment of the integrated desulfurization wastewater is characterized in that powdered activated carbon is selected in the adsorption of the concentration tank.
Furthermore, the internal pressure cross flow type filtering membrane is PVDF.
Furthermore, the membrane cleaning adopts a water washing mode, a gas washing mode or a medicine washing mode.
Furthermore, the reverse osmosis membrane adopted in the reverse osmosis unit is aromatic polyamide.
The utility model has the beneficial effects that: the integrated desulfurization wastewater concentration and decrement zero-emission treatment device integrates all treatment units into a process, a set of system and a box body, and has the advantages of smooth process flow, high automation degree, small occupied area, convenience in transportation, flexibility in application and the like. The process operating cost and the process investment cost are greatly reduced. The treatment result shows that the effluent has good quality, the COD content in the effluent is less than 50mg/L, the total soluble solid content is less than 500mg/L, and the investment per ton of water is about 4.0 ten thousand yuan. Low energy consumption, high efficiency and lower energy consumption per ton of water than the conventional desulfurization wastewater treatment process.
Drawings
FIG. 1 is a schematic flow diagram of an integrated desulfurization wastewater concentration and decrement zero-emission treatment device.
Detailed Description
The technical solution of the present invention is further described below with reference to the accompanying drawings: as shown in fig. 1: an integrated desulfurization wastewater concentration and decrement zero-emission treatment device comprises a softening and hard-removal adsorption treatment unit, a tubular microfiltration membrane system, a nanofiltration system and a reverse osmosis unit which are sequentially connected through pipelines; the softening and hard-removing adsorption treatment unit comprises a reaction tank and a concentration tank; the tubular microfiltration membrane system adopts an internal pressure cross-flow type filtration membrane; the nanofiltration membrane system is a pressure-driven membrane separation process; the reverse osmosis unit comprises a primary reverse osmosis system, a high-pressure reverse osmosis system and a secondary reverse osmosis system, the primary reverse osmosis system is used for treating nanofiltration produced water and concentrated water of the secondary reverse osmosis system, and the secondary reverse osmosis system is used for treating the concentrated water of the primary reverse osmosis system and the concentrated water of the high-pressure reverse osmosis system; the high-pressure reverse osmosis system is used for treating concentrated water of primary reverse osmosis.
The concentration tank is connected with a sludge pool, waste obtained after the treatment of the concentration tank enters the sludge pool, the waste is treated by a filter press after the precipitation, filtrate enters the softening and hardness-removing adsorption treatment unit for retreatment, and the sludge is discharged and transported outside.
The concentrated water treated by the tubular microfiltration system flows back to the softening and hard-removing adsorption treatment unit for treatment again; the wastewater passes through a homogenizing adjusting tank before entering the treatment device; the reaction tank adopts a chemical softening method, namely NaOH, a magnesium agent and Na2CO3 are added into the reaction tank; the adsorption of the concentration tank selects powdered activated carbon; the internal pressure cross-flow type filter membrane is PVDF; the membrane cleaning adopts a water washing mode, an air washing mode or a medicine washing mode; the reverse osmosis membrane adopted in the reverse osmosis unit is aromatic polyamide.
The utility model discloses an integrated desulfurization wastewater concentration and decrement zero emission treatment device, which comprises the following working processes:
A. desulfurization waste water enters into the homogeneity equalizing basin at first and carries out the regulation of quality of water yield, and the back enters into and softens the pretreatment unit and softens except that hard absorption:
a said homogeneous regulating tankThe liquid enters a reaction tank for softening and hardness removal reaction, the softening treatment process adopts a chemical softening method, the pH value of the reaction tank is adjusted to 8-9, and NaOH and Na are adopted simultaneously2CO3The magnesium method removes hardness and silicon in water, and only needs to keep the addition amount of NaOH at 360mg/L, the addition amount of magnesium at 600mg/L, NaOH and Na during normal operation2CO3Mixing with magnesium agent for 30min, adjusting pH to 11-11.5, stirring, and concentrating;
NaOH、Na2CO3the chemical reaction formula of the magnesium softening agent is as follows:
Ca(HCO3)2+Ca(OH)2-->2CaCO3↓
MgCl2+Ca(OH)2+Na2CO3-->2CaCO3↓+2NaCl+Mg(OH)2↓
removing silicon in water by adopting a magnesium agent method:
SiO2+Mg(OH)2(s)-->Mg(HSiO3)2↓
b, the liquid softened by the reaction tank enters a concentration tank, powdered activated carbon is added to remove organic matters through adsorption, and the friction effect of the inner surface of the membrane can be increased.
Adding powdered activated carbon in the utility model for reaction for 30min, keeping the adding amount of the powdered activated carbon at 50mg/L, and then lifting the powdered activated carbon into a tubular microfiltration membrane for solid-liquid separation; b, liquid in the concentration tank enters the sewage in the tubular microfiltration membrane for solid-liquid separation, when the solid concentration reaches 3-5%, sludge is discharged, the sludge is discharged to the sludge concentration tank, then the sludge enters a plate frame filter pressing treatment, and the filter pressing liquid is discharged into a reaction tank for retreatment;
c, the liquid after the solid-liquid separation by the tubular microfiltration enters a nanofiltration system, acid and sodium bisulfite are added into a water outlet pipeline of the tubular microfiltration, and the PH is adjusted from 9 to 9.5 back to 7 to 7.5; nanofiltration is carried out by means of the function of a selective permeable membrane and taking pressure difference as driving force, a large amount of monovalent salt and small molecular substances permeate the membrane, and soluble divalent ions, organic matters, bacteria, viruses and the like are intercepted on the water inlet side of the membrane;
meanwhile, TDS of nanofiltration produced water is reduced, and the operation load of a subsequent reverse osmosis unit and a DTRO unit is effectively reduced;
d, the separated liquid of the nanofiltration system enters a reverse osmosis unit;
in the utility model, the reverse osmosis unit adopts two-stage reverse osmosis for desalting, and the type of the reverse osmosis membrane element selects the membrane element with large water permeability, high desalting rate, good chemical stability, good pollution resistance and high mechanical strength according to the salt content of inlet water and the pollution degree of the inlet water. The material of the first-level reverse osmosis membrane is aromatic polyamide, and the recovery rate is more than or equal to 50%; the secondary reverse osmosis is used for treating the water produced by the primary reverse osmosis and the high-pressure reverse osmosis, the membrane material is aromatic clustered polyamide, and the recovery rate is more than or equal to 75 percent; and b, removing most of soluble salt, micromolecule soluble organic matters and the like in the water by utilizing the characteristics of the reverse osmosis membrane. Under sufficient pressure, the inlet water passes through the permeable membrane to become pure water which is discharged into the clean water tank, while the impurity concentration in the concentrated water side which can not pass through the membrane is gradually increased, and the concentrated water generated by the secondary reverse osmosis enters the front end of the primary reverse osmosis system for retreatment.
E, enabling the concentrated water of the first-stage reverse osmosis to enter a rear-end high-pressure reverse osmosis unit: in the utility model, the high-pressure reverse osmosis unit adopts a 90bar treatment mode, the concentrated water generated by the first-stage reverse osmosis is subjected to reduction treatment, and the desalination rate can reach 98%. The high-pressure reverse osmosis unit removes most of soluble salt, small molecular soluble organic matters and the like in the reverse osmosis unit concentrated water by utilizing the high rejection rate and the ultrahigh pressure resistance of the reverse osmosis membrane, and the reverse osmosis unit concentrated water is subjected to reduction treatment. And the produced water of the high-pressure reverse osmosis unit enters a secondary reverse osmosis unit for deep desalination treatment.
The high-pressure reverse osmosis membrane module is easy to disassemble and maintain, fully automatically operates, is simple to maintain, and allows any single component in the module to be independently replaced. The filtering part can be singly replaced when the membrane needs to be replaced, and the membrane with good filtering performance can still be continuously used, so that the replacement cost of the membrane is reduced to the maximum extent. The high-pressure reverse osmosis membrane group is easy to clean, and the flux recovery performance is good after cleaning.
F, the disc type membrane of the high-pressure reverse osmosis membrane is made of aromatic polyamide; all process units are integrated into a set of system and a box body, so that the process flow is smooth, the automation degree is high, the occupied area is small, the transportation is convenient, and the flexible application is realized.
Claims (7)
1. The utility model provides an integrate concentrated decrement zero discharge processing apparatus of desulfurization waste water which characterized in that: the treatment device comprises a softening and hard-removing adsorption treatment unit, a tubular microfiltration membrane system, a nanofiltration system and a reverse osmosis unit which are sequentially connected through pipelines;
the softening and hard-removing adsorption treatment unit comprises a reaction tank and a concentration tank;
the tubular microfiltration membrane system adopts an internal pressure cross-flow type filtration membrane;
the nanofiltration system is a pressure-driven membrane separation process;
the reverse osmosis unit comprises a primary reverse osmosis system, a high-pressure reverse osmosis system and a secondary reverse osmosis system, the primary reverse osmosis system is used for treating nanofiltration produced water and concentrated water of the secondary reverse osmosis system, and the secondary reverse osmosis system is used for treating the concentrated water of the primary reverse osmosis system and the high-pressure reverse osmosis system; the high-pressure reverse osmosis system is used for treating concentrated water of primary reverse osmosis.
2. The integrated desulfurization wastewater concentration and decrement zero-emission treatment device according to claim 1, characterized in that: the concentration tank is connected with a sludge pool, waste obtained after the treatment of the concentration tank enters the sludge pool, the waste is treated by a filter press after the precipitation, filtrate enters the softening and hardness-removing adsorption treatment unit for retreatment, and the sludge is discharged and transported outside.
3. The integrated desulfurization wastewater concentration and decrement zero-emission treatment device according to claim 1, characterized in that: and the concentrated water treated by the tubular microfiltration system flows back to the softening and hard-removing adsorption treatment unit for treatment again.
4. The integrated desulfurization wastewater concentration and decrement zero-emission treatment device according to claim 1, characterized in that: the wastewater passes through a homogenizing adjusting tank before entering the treatment device.
5. The integrated desulfurization wastewater concentration and decrement zero-emission treatment device according to claim 1, characterized in that: the adsorption of the concentration tank selects powdered activated carbon.
6. The integrated desulfurization wastewater concentration and decrement zero-emission treatment device according to claim 1, characterized in that: the internal pressure cross-flow type filter membrane is PVDF.
7. The integrated desulfurization wastewater concentration and decrement zero-emission treatment device according to claim 1, characterized in that: the reverse osmosis membrane adopted in the reverse osmosis unit is aromatic polyamide.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114804488A (en) * | 2022-04-25 | 2022-07-29 | 倍杰特集团股份有限公司 | Reduction treatment device and method for gasified concentrated water |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114804488A (en) * | 2022-04-25 | 2022-07-29 | 倍杰特集团股份有限公司 | Reduction treatment device and method for gasified concentrated water |
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