CN212864409U - Water denitrification adsorption dephosphorization deep purification system - Google Patents
Water denitrification adsorption dephosphorization deep purification system Download PDFInfo
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Abstract
The utility model discloses a water denitrification adsorption dephosphorization advanced purification system, which comprises a pretreatment device, a plasma denitrification device and an adsorption dephosphorization and phosphorus recovery device; the pretreatment device is communicated with a water body to be treated and is used for primary filtration through a precision filter; the plasma denitrification device comprises a plasma generator and a denitrification reaction tank, wherein a water inlet and an outlet of the plasma generator are respectively connected with the pretreatment device and the denitrification reaction tank; the device for removing phosphorus and recovering phosphorus through adsorption comprises an adsorption tower, a desorption regeneration system and a phosphorus precipitation recovery system, wherein a water inlet (311) of the adsorption tower is connected with the output end of the denitrification reaction tank, the desorption regeneration system is connected with the adsorption tower and stores the eluted recovery liquid in a phosphorus recovery liquid storage tank, and the output end of the phosphorus recovery liquid storage tank is connected with the phosphorus precipitation recovery system. The utility model discloses a system nitrogen removal adsorbs dephosphorization ability reinforce, can improve quality of water comprehensively, has the little advantage of area simultaneously.
Description
Technical Field
The utility model relates to a sewage treatment technical field, concretely says so and relates to a water denitrogenation adsorbs dephosphorization deep purification system.
Background
The poor V-class water body and the black and odorous water body are blackened and smelled due to the fact that the water body excessively receives dirt and exceeds the water environment capacity of the water body, and are generally lower than the V-class water quality standard of surface water environment quality standard (GB3838-2002), and the main characteristic indexes of the poor V-class water body and the black and odorous water body are that dissolved oxygen is less than 2.0mg/L, ammonia nitrogen is more than 2.0mg/L or total phosphorus is more than 0.4mg/L, the poor V-class water body and the black and odorous water body are located in areas with dense population, high pollution load intensity and incomplete infrastructure, and mainly comprise water bodies in urban built-up areas, urban and rural junctions. In order to strengthen water body treatment and improve water environment, the state academy reaches ten items of water in 2015, requires to treat the black and odorous water body in the city, adopts measures such as source control and sewage interception, garbage cleaning, dredging and dredging, ecological restoration and the like, increases the treatment strength of the black and odorous water body, and publishes treatment conditions to the society every half year. The Ministry of urban and rural construction of housing, together with the Ministry of environmental protection, Water conservancy and agriculture, has set up the working guidelines for treating black and odorous water in cities. Therefore, the treatment of water pollution is an urgent task.
Disclosure of Invention
In order to solve the technical problem, an object of the utility model is to provide a water denitrogenation adsorbs dephosphorization deep purification system.
The utility model discloses a following technical scheme realizes: a water denitrification adsorption dephosphorization advanced purification system comprises a pretreatment device (100), a plasma denitrification device (200) and an adsorption dephosphorization and phosphorus recovery device (300) which are sequentially connected; wherein the pretreatment device (100) is communicated with a water body to be treated and is used for primary filtration through a precision filter; the plasma denitrification device (200) comprises a plasma generator (210) and a denitrification reaction tank (230), wherein a water inlet (214) and an outlet (215) of the plasma generator are respectively connected with the pretreatment device (100) and the denitrification reaction tank (230); the device (300) for removing phosphorus by adsorption and recovering phosphorus comprises an adsorption tower (310), a desorption regeneration system (320) and a phosphorus precipitation recovery system (330), wherein a water inlet (311) of the adsorption tower is connected with the output end of the denitrification reaction tank (230), the desorption regeneration system (320) is connected with the adsorption tower (310) and stores eluted recovery liquid in a phosphorus recovery liquid storage tank (328), and the output end of the phosphorus recovery liquid storage tank (328) is connected with the phosphorus precipitation recovery system (330).
Preferably, a water distributor (232) is arranged at the lower part of the denitrification reaction tank (230), and the input end of the water distributor (232) is communicated with the water inlet (231) of the denitrification reaction tank.
Preferably, the desorption regeneration system (320) comprises a regeneration liquid storage tank (321), a clean water tank (324) and the phosphorus recovery liquid storage tank (328), the water outlet (318) of the adsorption tower (310) is respectively communicated with the phosphorus recovery liquid storage tank (328) and the clean water tank (324) through a water outlet cross joint (319), and the output end of the regeneration liquid storage tank (321) is communicated with the water inlet (311) of the adsorption tower through a water inlet cross joint (312).
Preferably, the regeneration liquid storage tank (321) stores 1-5% sodium hydroxide solution.
Preferably, the regeneration liquid storage tank (321) stores 3-5% of sodium hydroxide solution.
Preferably, the phosphorus precipitation recovery system (330) comprises a phosphorus precipitation reaction tank (333), a precipitant storage tank (335), a phosphorus precipitation recovery tank (337) and a concentration tank (339), wherein the input end and the output end of the phosphorus precipitation reaction tank (333) are respectively communicated with the phosphorus recovery liquid storage tank (328) and the phosphorus precipitation recovery tank (337), the phosphorus precipitation reaction tank (333) is further provided with the precipitant storage tank (335), and the precipitant storage tank (335) is used for inputting a medicament into the phosphorus precipitation reaction tank (333); the water outlet of the phosphorus precipitation recovery tank (337) is connected with the inlet of the concentration tank (339), and the outlet of the concentration tank (339) is connected with the desorption regeneration system (320) through a recovery pump (340).
Preferably, the precipitant storage tank (335) stores a saturated solution of calcium hydroxide.
Preferably, a stirrer (334) is also arranged on the phosphorus precipitation reaction tank (333).
Preferably, the plasma denitrification apparatus (200) further comprises a descaling system of the plasma generator, the descaling system is provided with a descaling agent storage tank (240), a one-way valve (241), a cleaning pump (242), an inlet valve (243) and a water outlet valve (244), the one-way valve (241), the cleaning pump (242) and the inlet valve (243) are sequentially arranged between the output end of the descaling agent storage tank (240) and the water inlet (214) of the plasma generator, and the water outlet valve (244) is arranged at the outlet (215) of the plasma generator (210).
Preferably, the adsorption tower (310) comprises a water inlet (311), a lower support plate (315), adsorption packing (316), an upper support plate (317) and a water outlet (318), wherein the adsorption packing is filled between the upper support plate (317) and the lower support plate (315).
The plasma coagulation integrated sewage treatment system and the plasma coagulation integrated sewage treatment method have the following action principles:
firstly, the plasma generator 210 generates a large amount of plasma when working, the plasma reacts with water to generate a large amount of free radicals with strong activity, wherein O & OH & can react with organic molecules of the plasma to generate water and carbon dioxide; o.and NH3Reaction to form water and NO3 ﹣(ii) a Cl and H with NO3 ﹣Reacts with ammonia nitrogen to generate N2And H2And O. H generated by the plasma effect and not participating in the reaction in time generates hydrogen to form a large amount of micro bubbles; in addition,. H and NO3 ﹣And NO2 ﹣Reaction to form N2A large number of microbubbles are also formed; along with the floating of the microbubbles of hydrogen and nitrogen, a large amount of suspended solids can be brought out, the effect of solid-liquid separation is achieved, the air flotation effect is formed, and the pollution indexes such as COD (chemical oxygen demand), chromaticity, turbidity and the like in the wastewater are further reduced; the plasma denitrification apparatus 200 has an effect of eliminating odor by the action of the radicals generated by the plasma and the odorous substances in the polluted water.
1. Principle of removing COD and BOD
RH+O·—→CO2↑+H2O
RH+HO·—→CO2↑+H2O
·Cl+H2O—→HClO—→O·+HCl
RH-means organic matter.
2. Decolorization (deodorization) principle
R-R＇+O·—→CO2↑+H2O
R' -represents an organic chromophore.
3. Principle of removing ammonia nitrogen
NH3+O·—→NO3 ﹣+H2O
4. Principle for removing nitrate nitrogen
NO2 ﹣+O·—→NO3 ﹣
NO3 ﹣+H·—→NO2 ﹣+H2O
NO2 ﹣+H·—→N2↑+H2Main reaction of O denitrogenation
5. Principle for increasing dissolved oxygen in water body
The plasma machine is adopted to carry out plasma treatment on the water body, a large amount of oxygen radicals and hydroxyl radicals can be generated, in the water body treatment process, the oxygen radicals or the hydroxyl radicals which are not completely consumed are combined with each other, water molecules and oxygen molecules are generated, and dissolved oxygen in the water is increased.
O·+O·—→O2↑
2HO·+2HO·—→2H2O+O2↑
Secondly, the effluent after plasma denitrification flows into a phosphorus adsorption tower through a water inlet of the adsorption tower, and phosphate ions in the water body are adsorbed by a special phosphorus adsorption filler in the phosphorus adsorption tower, so that phosphate in the water body is removed.
Reaction formula (adsorption reaction):
Fe-OOH+H2PO4 -＝Fe-O-HPO4 -+H2O
thirdly, when the adsorption saturation of the phosphorus reaches 80-90%, closing a water inlet valve 313 and a water outlet valve, opening a water inlet valve of the eluent and a regenerated liquid outlet valve 323, starting an eluent dosing pump, cleaning the phosphorus adsorption filler, desorbing phosphate radicals adsorbed in the filler, flowing out along with the eluent, and storing in a phosphorus recovery liquid storage tank 328; after the desorption is finished, the eluent water inlet valve and the regenerated liquid outlet valve are closed, the clean water inlet valve and the clean water valve 326 are opened, and the adsorption filler is washed to be neutral by clean water, so that the regeneration of the adsorption filler is finished.
Reaction formula (desorption reaction):
Fe-O-HPO4-+3OH-＝Fe-OOH+PO4 3-+OH-+H2O
fourthly, pumping the phosphorus eluent stored in the phosphorus recovery liquid storage tank 328 into the phosphorus precipitation reaction tank 333, starting the dosing pump 336 and the stirrer 334, pumping the calcium hydroxide saturated solution stored in the precipitant storage tank 335 into the phosphorus precipitation reaction tank 333, reacting to generate calcium phosphate precipitate, separating the precipitate, and returning the supernatant into the coagulation process to precipitate the calcium phosphate into the recovered calcium phosphate.
Reaction formula (precipitation crystallization reaction):
PO4 3-+3/2Ca(OH)2＝1/2Ca3(PO4)2+3OH-
after the water body denitrification adsorption dephosphorization advanced purification system is adopted and treated by the steps, the COD in the water body can be removed by 80-95%, and the COD of the effluent is less than or equal to 20 mg/L; BOD is removed by 95-99%, and the BOD of the effluent is less than or equal to 6 mg/L; 95-99.5% of total phosphorus is removed, so that the total phosphorus in the effluent is less than or equal to 0.1 mg/L; the ammonia nitrogen of the effluent is less than or equal to 1.0mg/L, the ammonia nitrogen is removed by 95-99.99%, the total nitrogen of the effluent is less than or equal to 5mg/L, and the total nitrogen is removed by 80-95%; removing 90-99% of chroma; is particularly suitable for the purification treatment of surface water bodies or black and odorous water bodies with inferior V-class water quality and the upgrading and reconstruction of sewage treatment plants, so that the water bodies reach the water quality standards of class II or class III of surface water environmental quality standards GB 3838-2002.
The water denitrification adsorption dephosphorization deep purification system process has the following remarkable effects:
1. the water denitrification adsorption dephosphorization advanced purification system integrates water pretreatment, plasma denitrification and adsorption dephosphorization, and can remove 95-99.99% of ammonia nitrogen and 80-95% of total nitrogen in water together during plasma denitrification, so that the ammonia nitrogen content of the effluent is less than or equal to 1.0mg/L and the total nitrogen content is less than or equal to 5mg/L, and the COD in the water can be further reduced.
2. The water denitrification adsorption dephosphorization advanced purification system is also provided with an adsorption dephosphorization device after plasma denitrification purification, phosphate radical in the water is removed through a phosphorus adsorption filler with a strong phosphate radical selecting effect, so that the total phosphorus in the water is less than or equal to 0.1mg/L, COD and chroma in the water are also adsorbed, the water quality is further improved, and after adsorption dephosphorization, the COD in the water can be removed by 80-95%, and the COD of the effluent is less than or equal to 20mg/L, BOD and less than or equal to 6 mg/L; 95-99.5% of total phosphorus is removed, so that the total phosphorus in the effluent is less than or equal to 0.1 mg/L; the ammonia nitrogen of the effluent is less than or equal to 1.0mg/L, the ammonia nitrogen is removed by 95-99.99%, the total nitrogen of the effluent is less than or equal to 5mg/L, and the total nitrogen is removed by 80-95%; removing 90-99% of chroma; is particularly suitable for the purification treatment of surface water bodies or black and odorous water bodies with inferior V-class water quality and the upgrading and reconstruction of sewage treatment plants, so that the water bodies reach the water quality standards of class II or class III of surface water environmental quality standards GB 3838-2002.
3. The device has the advantages of small floor area, small floor area and simple process steps, and the floor area of the device is less than one tenth of that of the traditional device.
4. The phosphorus removal of the invention is more thorough, the free radicals generated by the plasma treatment react with biological phosphorus and organic phosphorus in the water body to generate inorganic phosphate radicals, and then the total phosphorus content is less than or equal to 0.1mg/L after the phosphorus removal by adsorption.
5. According to the invention, water is decomposed to generate oxygen by impacting water molecules through plasma, the content of dissolved oxygen in the purified water body is higher than 7mg/L, the dissolved oxygen in the water body can be effectively increased, the growth of algae is effectively inhibited, and the water quality is comprehensively improved.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of the plasma denitrification and adsorption dephosphorization process of the present invention.
FIG. 2 is a schematic diagram of the adsorption dephosphorization of the present invention.
Fig. 3 is a schematic view of the apparatus of the present invention.
Fig. 4 is a schematic structural view of the plasma denitrification apparatus of the present invention.
FIG. 5 is a schematic structural view of the phosphorus adsorption and removal and recovery device of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
Referring to the attached drawings 1-5 of the specification, the invention provides a water denitrification adsorption dephosphorization advanced purification system, which comprises a pretreatment device, a plasma denitrification device 200 and an adsorption dephosphorization and phosphorus recovery device 300; wherein, the water inlet of the pretreatment device is connected with the sewage inlet, and the pretreatment device 100, the plasma denitrification device 200 and the adsorption dephosphorization and phosphorus recovery device 300 are connected in sequence.
1. Pretreatment device
The pretreatment device comprises a water collecting well 110, a lifting pump 120, a precision filter and an intermediate pool which are communicated in sequence; the water inlet of sump 110 and the sewage UNICOM that needs to handle, the input of elevator pump 120 with the delivery port intercommunication of sump 110, the delivery port of elevator pump 120 and precision filter's water inlet intercommunication, precision filter's delivery port and the water inlet intercommunication of middle pond, the delivery port of middle pond and plasma generator 210's input intercommunication.
2. Plasma denitrification device
The plasma denitrification device 200 comprises a plasma generator 210, a pulse power supply 220 and a denitrification reaction tank 230, wherein a water inlet of the plasma generator 210 is communicated with a middle water tank through a water taking pump 211 and a water inlet valve 212, clear water after coagulating sedimentation is input into the plasma generator, and an outlet 215 of the plasma generator 210 is communicated with a water inlet 231 of the denitrification reaction tank.
Preferably, the plasma generator 210 includes at least one set of electrodes therein, optionally one of graphite, iron, aluminum, zinc, copper, lead, nickel, alloys, and inert electrodes with noble metal oxide coatings; preferably, the inert electrode has a noble metal oxide coating.
Preferably, the pulsed operation of the plasma generator 210 is electricalThe voltage is 0.01-30 KV, and the current density is 1-10 mA/cm2The frequency is 2400-2600 MHz, and the residence time of the sewage body in the plasma generator 210 is 1-10 s.
Further, a water distributor 232 is disposed at the lower portion of the denitrification reaction tank 230 and used for uniformly distributing the polluted water output by the plasma generator 210 to the region in the denitrification reaction tank 230, and an input end of the water distributor 232 is communicated with a water inlet 231 of the denitrification reaction tank.
Preferably, the retention time of the polluted water body in the denitrification reaction tank 230 is 10-150 min.
Preferably, the plasma denitrification apparatus 200 further comprises a descaling system of the plasma generator, the descaling system comprises a descaling agent storage tank 240, a one-way valve 241, a cleaning pump 242, an inlet valve 243 and an outlet valve 244, the cleaning pump 242 and the inlet valve 243 are installed between the output end of the descaling agent storage tank 240 and the water inlet 214 of the plasma generator, and the outlet valve 244 is installed at the outlet 215 of the plasma generator, i.e. two water paths are arranged in parallel at the outlet 215 of the plasma generator 210.
3. Phosphorus adsorption and removal and phosphorus recovery device
The device 300 for removing phosphorus by adsorption and recovering phosphorus is composed of an adsorption tower 310, a desorption regeneration system 320 and a phosphorus precipitation recovery system 330.
Specifically, the adsorption tower 310 comprises a water inlet 311, a lower support plate 315, adsorption filler 316, an upper support plate 317 and a water outlet 318, wherein the adsorption filler 316 is positioned between the upper support plate 317 and the lower support plate 315 and is used for adsorbing phosphorus components in the water body entering the adsorption tower, and preferably, when adsorption dephosphorization is performed, the retention time of the water body after denitrification treatment in the adsorption tower 310 is 200-800 s; the water inlet 311 is communicated with a first water path of the water inlet cross 312, and the water inlet valve 313 is used for controlling the water communication between the adsorption tower and the plasma denitrification device; the water outlet 318 is communicated with a first waterway of the water outlet cross 319. When the phosphorus is removed by adsorption, the regenerated liquid outlet valve 323, the water outlet valve 314, the clean water valve 326 and the phosphorus recovery liquid outlet valve 327 are closed, and the water inlet body is further connected with the adsorption tower (310) through the water inlet valve 313, the water inlet four-way valve 312 and the water inlet 311.
The desorption regeneration system 320 comprises a regeneration liquid storage tank 321, a regeneration liquid delivery pump 322, a regeneration liquid outlet valve 323, a clean water tank 324, a clean water pump 325, a clean water valve 326, a phosphorus recovery liquid outlet valve 327 and a phosphorus recovery liquid storage tank 328, wherein the regeneration liquid storage tank 321 is communicated with the second water path of the water inlet four-way 312 through the regeneration liquid delivery pump 322 and the regeneration liquid outlet valve 323 and is connected to the water inlet 311 of the adsorption tower through the second water path of the water inlet four-way 312; the clean water tank 324 is communicated with a second waterway of the water outlet cross 319 through a clean water pump 325 and a clean water valve 326, and is further connected with the water outlet 318 of the adsorption tower 310 through the second waterway of the water outlet cross 319; the water inlet of the phosphorus recovery liquid storage tank 328 is connected with the water outlet 318 of the adsorption tower 310 through a water way of a phosphorus recovery liquid outlet valve 327 and a water outlet four-way 319, and the water outlet of the phosphorus recovery liquid storage tank is connected with a phosphorus precipitation recovery system 330. Wherein, the regenerated liquid storage tank 321 stores 1-5% sodium hydroxide solution as eluent (regenerated liquid) of phosphate radical, and is connected to the adsorption tower 310 through a regenerated liquid outlet valve 323 and a water inlet four-way 312; more preferably, the eluent stored in the regeneration liquid storage tank 321 is a 3-5% sodium hydroxide solution.
The phosphorus precipitation recovery system 330 comprises a phosphorus precipitation reaction tank 333, a precipitator storage tank 335, a phosphorus precipitation recovery tank 337 and a concentration tank 339, wherein the water outlet of the phosphorus recovery liquid storage tank 328 enters the phosphorus precipitation reaction tank 333 through an eluent water inlet valve 332; the phosphorus precipitation reaction tank 333 is provided with a stirrer 334, and the phosphorus precipitation reaction tank 333 is connected with a precipitator storage tank 335, preferably, the precipitator storage tank 335 is stored with calcium hydroxide saturated solution, and more preferably, the phosphorus precipitation solution storage tank is stored with calcium chloride solution; the water inlet of the phosphorus precipitation reaction tank 333 is communicated with the water outlet of the phosphorus recovery liquid storage tank 328, and the water outlet of the phosphorus precipitation reaction tank 333 is connected with the phosphorus precipitation recovery tank 337; the water outlet of the phosphorus precipitation recovery tank 337 is connected to the concentration tank 339, and the water outlet of the concentration tank 339 is connected to the regenerated liquid storage tank 321. When the device works, the phosphorus eluent in the phosphorus recovery liquid storage tank 328 is pumped into the phosphorus precipitation reaction tank 333, the dosing pump 336 is started, the calcium hydroxide saturated solution stored in the precipitator storage tank 335 is pumped into the phosphorus precipitation reaction tank 333, the stirrer 334 is started to accelerate the reaction to generate calcium phosphate precipitate, the calcium phosphate precipitate is pumped into the phosphorus precipitation recovery tank 337, and the supernatant in the phosphorus precipitation recovery tank enters the concentration tank 339 for concentration under the action of the pump 338 and is pumped into the regeneration liquid storage tank 321 by the recovery pump 340 for recycling.
In a preferred embodiment, the water body denitrification, adsorption and dephosphorization advanced purification system further comprises an automatic control device which consists of a controller, an electric conductivity sensor, a flow sensor, a potential sensor, a stirring rotation speed sensor, a temperature sensor, a chlorine sensor, a hydrogen sensor, a pH value sensor, a PLC and a control valve, wherein the control device comprises an electric valve or a pneumatic valve. Specifically, the controller comprises a control unit, a fault detection unit, a data receiving unit and a data processing unit, wherein the data processing unit comprises a calculation module and a judgment module, and the fault detection unit can receive a fault signal and transmit the fault signal to the control unit; the data receiving unit can receive working signals such as water quality, system operation, valve group switch states and pump operation states acquired by the sensors, transmit the working signals to the data processing unit, and transmit the working signals to the control unit after the working signals are processed by the computing module and the module. The control unit can send out an instruction to control the water body plasma purification, the coagulating sedimentation process and the sludge treatment process in the system, namely, the reflux repurification. The automatic operation of the plasma coagulation integrated sewage treatment system is realized through the automatic control device, and then the automatic purification of the polluted water body is realized.
The invention also provides a sewage denitrification and dephosphorization deep purification process, which comprises the following steps:
(1) pretreatment: injecting the sewage into a water collecting well 110, lifting the sewage by a lifting pump 120, entering a precision filter, filtering the sewage to remove various solid small-particle impurities, and then entering an intermediate water tank;
(2) plasma denitrification treatment: conveying the sewage from the middle water pool to the plasma generator 210 and staying for 1-10 s, wherein plasmas generated by the plasma generator 210 collide with each other to generate free radicals; the plasma generator210 has a pulse working voltage of 0.01-30 KV and a current density of 1-10 mA/cm2The frequency is 2400-2600 MHz;
(3) and (3) denitrification reaction: the effluent in the step (2) is uniformly distributed in a denitrification reaction tank 230 through a water distributor 232, the residence time is 10-150 min, and under the catalytic action of a catalyst, oxygen radicals (O.cndot.) and hydroxyl oxygen radicals (OH) in the water body react with ammonia nitrogen in the water body to generate nitrate nitrogen, nitrite nitrogen and water; meanwhile, hydrogen free radicals (. H) in the water body react with nitrate nitrogen and nitrite nitrogen to generate nitrogen and water; in addition, oxygen free radicals (O.OH) and hydroxyl free radicals (OH) in the water body react with BOD in the water body to generate CO2Water is blended to reduce COD, oxygen free radicals (O.OH) and hydroxyl oxygen free radicals (OH) in the water body can also react with organic phosphorus and biological phosphorus in the water body to generate phosphate radicals, nitrogen generated in the denitrification reaction process and oxygen generated by the action of plasma play a role in air flotation and can remove small particle solid matters in the water body; through denitrification reaction, 85-99.9% of ammonia nitrogen, 80-95% of total nitrogen, 90-100% of BOD, 99-100% of fecal coliform, 5-15% of COD and 5-10% of total phosphorus in the water body can be removed together, and meanwhile, the dissolved oxygen in the water body can be increased to be more than 7 mg/L;
the reaction to remove ammonia nitrogen is:
NH4 ++10O·→2NO3 -+4H2O
the reaction of the denitrified nitrogen is as follows:
NO2 -+O·→NO3 -
NO3 -+H·→NO2 -+H2O
NO2 -+H·→N2↑+H2O
(4) and (3) adsorption dephosphorization: the effluent water after the plasma denitrification step flows into the adsorption tower 310 for phosphorus through a water inlet 311 of the adsorption tower, phosphate ions in the water body are adsorbed by the special filler for phosphorus adsorption in the adsorption tower 310, so that phosphate in the water body is removed, and the main principle is as follows: part of metal oxyhydroxide has extremely strong selective adsorption capacity to phosphorus in water with neutral pH, and the adsorbed phosphorus can be rapidly desorbed when the pH is changed into strong alkali; the support of the metal oxyhydroxide is, for example, polyethylene or polystyrene, and the metal oxyhydroxide is grafted to the support. The total phosphorus in the effluent is less than or equal to 0.1mg/L, and the removal rate of phosphorus is 95-99.5%.
Reaction formula (adsorption reaction):
Fe-OOH+H2PO4 -＝Fe-O-HPO4 -+H2O
(5) elution of phosphorus and regeneration of adsorption packing: when the adsorption saturation of phosphorus reaches 80-90%, closing a water inlet valve 313 and a water outlet valve of the adsorption tower, opening a water inlet valve of eluent (regenerated liquid) and a regenerated liquid outlet valve 323, starting an eluent dosing pump, cleaning the phosphorus adsorption filler in the adsorption tower 310, desorbing phosphate radicals adsorbed in the filler, flowing out along with the eluent and storing in a phosphorus recovery liquid storage tank 328; after desorption, closing the eluent water inlet valve and the regenerated liquid outlet valve, opening the clear water inlet valve and the clear water valve 326, and washing with clear water until the materials are neutral, thereby completing the regeneration of the adsorption filler; the eluent is 1-5% of sodium hydroxide solution.
Reaction formula (desorption reaction):
Fe-O-HPO4 -+3OH-＝Fe-OOH+PO4 3-+OH-+H2O
(6) and (3) recovering the phosphorus through precipitation: pumping the phosphorus eluent stored in a phosphorus recovery liquid storage tank 328 into a phosphorus precipitation reaction tank 333, starting a dosing pump 336, pumping the calcium hydroxide saturated solution stored in a precipitator storage tank 335 into the phosphorus precipitation reaction tank 333, starting a stirrer 334 to react to generate calcium phosphate precipitate, pumping the calcium phosphate precipitate into a phosphorus precipitation recovery tank 337, pumping the supernatant into a concentration tank 339 for concentration through a pump 338, pumping the concentrated supernatant into a regeneration liquid storage tank 321 for recycling, and obtaining the recovered calcium phosphate precipitate.
Reaction formula (precipitation crystallization reaction):
PO4 3-+3/2Ca(OH)2＝1/2Ca3(PO4)2+3OH-
preferably, when the plasma generator in the plasma denitrification apparatus needs to be descaled, the water inlet valve 212 and the water outlet valve 216 are closed, the check valve 241, the inlet valve 243 and the water outlet valve 244 are opened, the cleaning pump 242 is started, and the descaling liquid is pumped into the plasma generator 210 for circular cleaning.
After the sewage denitrification adsorption dephosphorization advanced purification system device is adopted and treated by the steps, the COD in the water body can be removed by 80-95%, and the COD of the effluent is less than or equal to 20 mg/L; removing 95-99% of BOD, and enabling the BOD of the effluent to be less than or equal to 6 mg/L; 95-99.5% of total phosphorus is removed, so that the total phosphorus in the effluent is less than or equal to 0.1 mg/L; the ammonia nitrogen of the effluent is less than or equal to 1.0mg/L, the ammonia nitrogen is removed by 95-99.99%, the total nitrogen of the effluent is less than or equal to 5mg/L, and the total nitrogen is removed by 80-95%; the chroma is removed by 90-99%, and the method is particularly suitable for purification treatment of surface water bodies or black and odorous water bodies with inferior V-class water quality and upgrading transformation of sewage treatment plants, so that the water bodies reach the water quality standards of class II or class III in the environmental quality standard GB3838-2002 for surface water.
Example one
The untreated wastewater quality index of a river is shown in table 1 below:
TABLE 1 Water quality index of slightly polluted water in a river
| Serial number | Basic control items | Measured value (mg/L) |
| 1 | COD | 39.27 |
| 2 | BOD | 18.11 |
| 3 | SS | 77 |
| 4 | Total nitrogen (in N) | 8.46 |
| 5 | Ammonia nitrogen (in N) | 7.22 |
| 6 | Total phosphorus (in terms of P) | 1.95 |
| 7 | Chroma (dilution multiple) | 10 |
| 8 | pH | 7.5 |
| 9 | Dissolved oxygen | 1.91 |
The sewage water body enters the water body denitrification adsorption dephosphorization advanced purification system for treatment; the sewage water body is sequentially treated in the pretreatment device treatment 100, the plasma denitrification device 200 and the adsorption dephosphorization and phosphorus recovery device 300 of the water body denitrification and adsorption dephosphorization advanced purification system.
In the step 1, the effluent quality of the sewage water body after being subjected to the precision filtration treatment by the pretreatment device is shown in table 2.
TABLE 2 Water quality index of river water after precise filtration treatment
In the step 2 and the step 3, the pretreated water body enters a plasma denitrification device 200 for treatment, the treated water body enters a denitrification reaction tank 230 for denitrification reaction, and the water quality index of the effluent is shown in the table 3; wherein the working voltage of the plasma generator 210 is 30V, and the current density is 1mA/cm2。
TABLE 3 Water quality index of a slightly polluted water treated by coagulating sedimentation and plasma denitrification apparatus
| Serial number | Basic control items | Filtered water (mg/L) | Denitrification effluent (mg/L) | Removal Rate (%) |
| 1 | COD | 33.04 | 17.13 | 48.21 |
| 2 | BOD | 17.55 | Not detected out | 100 |
| 3 | SS | 15 | 10 | 33.33 |
| 4 | Animal and vegetable oil | 0.5 | Not detected out | 100 |
| 5 | Petroleum products | 0.3 | Not detected out | 100 |
| 6 | Total nitrogen (in N) | 7.37 | 0.93 | 87.38 |
| 8 | Ammonia nitrogen (in N) | 7.09 | 0.15 | 97.88 |
| 9 | Total phosphorus (in terms of P) | 1.84 | 1.79 | 2.72 |
| 10 | Dissolved oxygen | 2.5 | 8.67 | - |
| 11 | Chroma (dilution multiple) | 8 | 5 | 37.50 |
| 12 | pH | 7.6 | 7.5 | - |
In step 4, the effluent treated by the plasma denitrification device 200 flows through the adsorption dephosphorization treatment for deep purification, and the quality of the treated effluent is shown in table 4.
TABLE 4 Water quality index after plasma denitrification and adsorption dephosphorization system for certain slightly polluted water
As can be seen from Table 4, the effluent indexes of the slightly polluted riverway water body after treatment completely meet the III-class water quality standard of the quality standard of surface water environment (GB 3838-2002).
Example two
The water quality indexes after the precipitation of the secondary sedimentation tank of the sewage treatment plant are shown in the following table 5:
TABLE 5 Water quality index after precipitation in secondary sedimentation tank of certain sewage treatment plant
| Serial number | Basic control items | Measured value (mg/L) |
| 1 | COD | 57 |
| 2 | BOD | 16 |
| 3 | SS | 23 |
| 4 | Animal and vegetable oil | 1.5 |
| 5 | Petroleum products | 1.0 |
| 6 | Total nitrogen (in N) | 23 |
| 7 | Ammonia nitrogen (in N) | 12 |
| 8 | Total phosphorus (in terms of P) | 1.0 |
| 9 | Chroma (dilution multiple) | 40 |
| 10 | pH | 7 |
| 11 | Dissolved oxygen | 4.6 |
The effluent of the sewage treatment plant enters the pretreatment device 100 of the water body denitrification adsorption dephosphorization advanced purification system for treatment, the effluent enters the plasma denitrification device 200 for denitrification treatment, the effluent after plasma treatment enters the denitrification reaction tank 230 for denitrification reaction, and the effluent of the denitrification reaction tank 230 flows through the adsorption dephosphorization and phosphorus recovery device 300 for advanced purification treatment.
Wherein, in the step 1, when the water body enters the pretreatment device 100 for treatment, the effluent quality is as shown in table 6.
TABLE 6 Water quality index of water precipitated in secondary sedimentation tank of certain sewage treatment plant after precision filtration
In step 2 and step 3, the effluent after the precision filtration is treated by a plasma denitrification device 200: the sewage is conveyed into the plasma generator 210 to stay for 10s, the working voltage is 30KV, the current density is 10mA/cm2(ii) a The quality of the effluent treated by the plasma denitrification device (200) is shown in Table 7.
TABLE 7 quality index of effluent from certain sewage plant after plasma denitrification
| Serial number | Basic control items | Filtered water (mg/L) | Denitrification effluent (mg/L) | Removal Rate (%) |
| 1 | COD | 48.2 | 31.06 | 34.44 |
| 2 | BOD | 12.00 | Not detected out | 100 |
| 3 | SS | 9 | 7 | 22.22 |
| 4 | Animal and vegetable oil | 1.3 | 0 | 100 |
| 5 | Petroleum products | 0.8 | 0 | 100 |
| 6 | Total nitrogen (in N) | 22.07 | 3.75 | 83.00 |
| 7 | Ammonia nitrogen (in N) | 11.51 | 0.32 | 97.23 |
| 8 | Total phosphorus (in terms of P) | 0.91 | 0.35 | 61.54 |
| 9 | Dissolved oxygen | 4.8 | 7.93 | - |
| 10 | Chroma (dilution multiple) | 35 | 20 | 42.86 |
| 11 | pH | 7 | 7.1 | - |
In the step 4, the sewage treated by the plasma denitrification device 200 is subjected to adsorption dephosphorization treatment, the retention time is 275s, and the quality of the treated effluent is shown in Table 8.
TABLE 8 effluent index of sewage from certain sewage plant after adsorption and dephosphorization
| Serial number | Basic control items | Filtered water (mg/L) | Denitrification effluent (mg/L) | Removal Rate (%) |
| 1 | COD | 31.06 | 19.23 | 38.09 |
| 2 | BOD | Not detected out | 1 | - |
| 3 | SS | 7 | 3 | 57.14 |
| 4 | Animal and vegetable oil | 0 | 0 | 0 |
| 5 | Petroleum products | 0 | 0 | 0 |
| 6 | Total nitrogen (in N) | 3.75 | 3.21 | 14.40 |
| 7 | Ammonia nitrogen (in N) | 0.32 | 0.27 | 15.63 |
| 8 | Total phosphorus (in terms of P) | 0.35 | 0.03 | 91.43 |
| 9 | Dissolved oxygen | 7.93 | 7.85 | - |
| 10 | Chroma (dilution multiple) | 20 | 1 | 95.00 |
| 11 | pH | 7.1 | 7.0 | - |
As can be seen from Table 8, the effluent indexes of the treated effluent of the sewage treatment plant completely meet the IV-class water quality standards of the quality Standard of Water Environment on the surface (GB 3838-2002).
While the foregoing description shows and describes the preferred embodiments of the present invention, it is to be understood that the invention is not limited to the forms disclosed herein, but is not intended to be exhaustive or to exclude other embodiments and may be used in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as expressed herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. But that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention, which is to be limited only by the claims appended hereto.
Claims (10)
1. A water denitrification adsorption dephosphorization advanced purification system is characterized by comprising a pretreatment device (100), a plasma denitrification device (200) and an adsorption dephosphorization and phosphorus recovery device (300) which are sequentially connected; wherein the pretreatment device (100) is communicated with a water body to be treated and is used for primary filtration through a precision filter; the plasma denitrification device (200) comprises a plasma generator (210) and a denitrification reaction tank (230), wherein a water inlet (214) and an outlet (215) of the plasma generator are respectively connected with the pretreatment device (100) and the denitrification reaction tank (230); the device (300) for removing phosphorus by adsorption and recovering phosphorus comprises an adsorption tower (310), a desorption regeneration system (320) and a phosphorus precipitation recovery system (330), wherein a water inlet (311) of the adsorption tower is connected with the output end of the denitrification reaction tank (230), the desorption regeneration system (320) is connected with the adsorption tower (310) and stores eluted recovery liquid in a phosphorus recovery liquid storage tank (328), and the output end of the phosphorus recovery liquid storage tank (328) is connected with the phosphorus precipitation recovery system (330).
2. The system of claim 1, wherein a water distributor (232) is disposed at the lower part of the denitrification reaction tank (230), and the input end of the water distributor (232) is communicated with the water inlet (231) of the denitrification reaction tank.
3. The water denitrification adsorption dephosphorization advanced purification system according to claim 1, wherein the desorption regeneration system (320) comprises a regeneration liquid storage tank (321), a clean water tank (324) and the phosphorus recovery liquid storage tank (328), the water outlet (318) of the adsorption tower (310) is respectively communicated with the phosphorus recovery liquid storage tank (328) and the clean water tank (324) through a water outlet cross (319), and the output end of the regeneration liquid storage tank (321) is communicated with the water inlet (311) of the adsorption tower through a water inlet cross (312).
4. The system of claim 3, wherein the regeneration liquid storage tank (321) stores 1-5% sodium hydroxide solution.
5. The water body nitrogen and phosphorus removal and adsorption deep purification system as claimed in claim 3, wherein said regeneration liquid storage tank (321) stores 3-5% sodium hydroxide solution.
6. The advanced water denitrification, adsorption and phosphorus removal purification system as claimed in claim 1, wherein said phosphorus precipitation recovery system (330) comprises a phosphorus precipitation reaction tank (333), a precipitant storage tank (335), a phosphorus precipitation recovery tank (337) and a concentration tank (339), wherein the input and output ends of said phosphorus precipitation reaction tank (333) are respectively connected to said phosphorus recovery liquid storage tank (328) and said phosphorus precipitation recovery tank (337), said phosphorus precipitation reaction tank (333) is further provided with said precipitant storage tank (335), and said precipitant storage tank (335) is used for inputting a chemical into said phosphorus precipitation reaction tank (333); the water outlet of the phosphorus precipitation recovery tank (337) is connected with the inlet of the concentration tank (339), and the outlet of the concentration tank (339) is connected with the desorption regeneration system (320) through a recovery pump (340).
7. The system of claim 6, wherein the precipitant tank (335) stores saturated solution of calcium hydroxide.
8. The system of claim 6, wherein the phosphorus precipitation reaction tank (333) is further provided with a stirrer (334).
9. The system of claim 1, wherein the plasma denitrification apparatus (200) further comprises a descaling system of the plasma generator, the descaling system comprises a descaling agent storage tank (240), a one-way valve (241), a cleaning pump (242), an inlet valve (243) and a water outlet valve (244), the one-way valve (241), the cleaning pump (242) and the inlet valve (243) are sequentially installed between the output end of the descaling agent storage tank (240) and the water inlet (214) of the plasma generator, and the water outlet valve (244) is installed at the outlet (215) of the plasma generator (210).
10. The system of claim 1, wherein the adsorption tower (310) comprises a water inlet (311), a lower support plate (315), adsorption packing (316), an upper support plate (317) and a water outlet (318), and the adsorption packing is filled between the upper support plate (317) and the lower support plate (315).
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