CN113830934A - Purification treatment system and process for surface water or urban landscape water - Google Patents

Purification treatment system and process for surface water or urban landscape water Download PDF

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Publication number
CN113830934A
CN113830934A CN202111282399.3A CN202111282399A CN113830934A CN 113830934 A CN113830934 A CN 113830934A CN 202111282399 A CN202111282399 A CN 202111282399A CN 113830934 A CN113830934 A CN 113830934A
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water
reduction reaction
area
zeolite
filter layer
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CN113830934B (en
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吴鹍
刘婷
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Xian University of Architecture and Technology
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Xian University of Architecture and Technology
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00—Multistage treatment of water, waste water or sewage
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/28—Treatment of water, waste water, or sewage by sorption
    • C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/70—Treatment of water, waste water, or sewage by reduction
    • C02F1/705—Reduction by metals
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/105—Phosphorus compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/16—Nitrogen compounds, e.g. ammonia
    • C02F2101/163—Nitrates

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  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Water Treatment By Sorption (AREA)

Abstract

A purification treatment system and process aiming at surface water or urban landscape water, the system comprises a reduction reaction unit and an adsorption filtration unit; the reduction reaction unit comprises a pH adjusting area and a reduction reaction area; the pH adjusting area is connected with inlet water and adjusts the pH of the inlet water to be alkaline, and the reduction reaction area is filled with zero-valent aluminum metal filler or granular filler containing zero-valent aluminum, so that nitrate radical of the inlet water after the pH is adjusted is reduced into ammonia gas and nitrogen gas in the reduction reaction area; the adsorption filtering unit comprises a medical stone filtering layer adsorption area and a zeolite filtering layer adsorption area; the treated water out of the reduction reaction zone sequentially enters a medical stone filter layer adsorption zone and a zeolite filter layer adsorption zone from top to bottom; the medical stone filter layer adsorption area is filled with a medical stone filter material, and the zeolite filter layer adsorption area is filled with a zeolite filter material; the invention realizes the aim of Al by a method for adjusting the pH value of the solution through low maintenance0And the morphological function of the product thereof are effectively controlled, thereby improving Al while reducing the difficulty of process maintenance0The application efficiency in denitrification and dephosphorization is high.

Description

Purification treatment system and process for surface water or urban landscape water
Technical Field
The invention belongs to the technical field of surface water purification treatment, relates to treatment of artificial water bodies in natural rivers and lakes and cities, can be used for deep nitrogen and phosphorus removal treatment of domestic sewage in communities or campuses under certain conditions, and is a purification treatment system and process aiming at surface water or urban landscape water.
Background
In recent years, natural rivers and lakesAnd the problems of deterioration of water quality and eutrophication of lakes in cities are becoming serious. Nitrogen and phosphorus pollutants are key factors for accelerating the eutrophication trend of the water body. The conventional biological nitrogen and phosphorus removal process is limited when being applied to nitrogen and phosphorus removal treatment of natural rivers, lakes or urban water bodies. In addition, in the biological treatment process of the sewage treatment station in the residential area or campus, due to the low carbon bit points of the distributed domestic sewage, the removal effect of the conventional biological method on nitrate nitrogen (nitrate) in water cannot meet the emission standard. Zero valent iron (Fe)0) Because of good reduction performance and Fe release2+The method has wide application in the aspects of nitrogen and phosphorus removal of sewage. Wherein, Fe0Denitrification is mainly accomplished by reduction, while Fe0Phosphorus removal is mainly through Fe3+Coprecipitation of phosphate radical and adsorption of Fe hydroxide. Zero valent aluminum (Al)0) Oxidation reduction potential ratio of Fe0In theory, nitrate in water can also be effectively reduced. However, due to Fe0Or Al0The surface is prone to produce Fe hydroxide or Al hydroxide films (i.e., "passivation" phenomena) which prevent the reaction between the zero-valent metal and the nitrate from proceeding. The acidification treatment can dissolve Fe0Or Al0Passivation of the surface, but this leads to Fe3+Or Al3+The release into the water may create a risk of the metal ions exceeding standards. Moreover, in order to ensure that the pH of the effluent reaches the standard, alkali liquor needs to be added subsequently to neutralize the pH of the solution, so that the difficulty of process operation is increased. Therefore, the application of acidified zero-valent iron or zero-valent aluminum in nitrogen and phosphorus removal is still more limited.
Disclosure of Invention
In order to overcome the disadvantages of the prior art, the present invention provides a system and a process for purifying surface water or city landscape water, considering Al0Strong reducing property of (2) and Al (OH)3The characteristic of amphoteric hydroxide is that Al is adjusted by low maintenance method of adjusting solution pH0And the morphological function of the product thereof are effectively controlled, thereby improving Al while reducing the difficulty of process maintenance0The application efficiency in denitrification and dephosphorization is high.
In order to achieve the purpose, the invention adopts the technical scheme that:
a purification treatment system for surface water or urban landscape water comprises a reduction reaction unit and an adsorption filtration unit;
the reduction reaction unit comprises a pH adjusting area and a reduction reaction area; the pH adjusting area is connected with inlet water and adjusts the pH of the inlet water to be alkaline, and the reduction reaction area is filled with zero-valent aluminum metal filler or granular filler containing zero-valent aluminum, so that nitrate radical of the inlet water after the pH adjustment is reduced into ammonia gas and nitrogen gas in the reduction reaction area;
the adsorption filtering unit comprises a medical stone filtering layer adsorption area and a zeolite filtering layer adsorption area; the treated water out of the reduction reaction zone sequentially enters the medical stone filter layer adsorption zone and the zeolite filter layer adsorption zone from top to bottom; the medical stone filter layer adsorption area is filled with a medical stone filter material, and the zeolite filter layer adsorption area is filled with a zeolite filter material; h in the treated water2AlO3 –Al released from the surface of medical stone3+Reacting to generate aluminum hydroxide floc, and neutralizing the pH value of the treated water, wherein the aluminum hydroxide floc adsorbs phosphate radicals in the treated water and is trapped in a medical stone filter layer adsorption area; the zeolite filter layer adsorption zone removes residual ammonia nitrogen in water through ion exchange effect, and Al released on the surface of zeolite3+With residual H in water2AlO3 –The reaction is carried out to generate aluminum hydroxide floc so as to further adsorb phosphate radical in the treated water.
Preferably, the pH adjusting area includes intake pool and pH adjusting medicament device, and the graticule mesh has been arranged at the intake pool top, and the intaking gets into the intake pool after the graticule mesh filters, and the delivery port of intake pool carries out the flow of S-shaped through vertical baffle in the bottom side, gets into the reduction reaction district from the bottom in reduction reaction district.
Preferably, the outlet water of the reduction reaction zone is connected with a water storage buffer zone, the top of the water storage buffer zone is provided with an outlet weir, the outlet water of the water storage buffer zone is connected with a water distributor through the outlet weir, and the water distributor is arranged right above the medical stone filter layer adsorption zone.
Preferably, a gravel supporting layer is arranged below the adsorption area of the zeolite filter layer, the bottom of the gravel supporting layer is connected with a bottom water collecting pipe and a backwashing system, the bottom water collecting pipe is used for discharging final treated water, and the backwashing system is used for flushing each layer of the adsorption filtration unit.
The invention also provides a purification treatment process for surface water or urban landscape water, which comprises the following steps:
step 1, adjusting the pH of inlet water to be alkaline;
step 2, feeding the inlet water after pH adjustment into a reduction reaction zone filled with a zero-valent aluminum metal filler or a particle filler containing zero-valent aluminum, and coating nitric acid radicals in the water with Al0Reducing the ammonia gas into ammonia gas and nitrogen gas, wherein the nitrogen gas and a part of the ammonia gas are released into the air, and the other part of the ammonia gas is dissolved and remains in the water in the form of ammonia nitrogen;
step 3, the water after the reduction reaction flows into the medical stone filtering layer adsorption area and the zeolite filtering layer adsorption area from top to bottom, and H in the water2AlO3 –Al released from the surface of medical stone3+Reacting to generate aluminum hydroxide floc, and neutralizing the pH value of the treated water, wherein the aluminum hydroxide floc adsorbs phosphate radicals in the treated water and is trapped in a medical stone filter layer adsorption area; the zeolite filter layer adsorption zone removes residual ammonia nitrogen in water through ion exchange effect, and Al released on the surface of zeolite3+With residual H in water2AlO3 –Reacting to generate aluminum hydroxide floc to further adsorb phosphate radical in the treated water;
and 4, discharging the water treated by the adsorption area of the zeolite filter layer.
Preferably, in the step 1, the pH of the inlet water is adjusted to 9-10, and in the step 2, the pH is 8.5-9 when the inlet water is discharged from the reduction reaction zone and is 6-8 when the inlet water is discharged from the zeolite filter layer adsorption zone under the condition that no medicament is added for adjusting the pH.
Preferably, in the step 3, along with the operation of the process, a layer of active filter membrane containing aluminum oxide or aluminum hydroxide is gradually loaded on the surfaces of the medical stone filter material in the medical stone filter layer adsorption area and the zeolite filter material in the zeolite filter layer adsorption area, and the active filter membrane adsorbs and removes the phosphate radical remained in the water through surface complexation.
Preferably, during the process operation, the medical stone filter layer adsorption area and the zeolite filter layer adsorption area are backwashed by using a backwashing system.
Compared with the prior art, the invention has the advantages that the reduction reaction zone filled with the zero-valent metal filler at the front end can convert nitrate nitrogen in water into nitrogen (escaping from the water surface) and ammonia nitrogen, and then the adsorption filtration zone filled with medical stone and zeolite at the rear end removes ammonia nitrogen and phosphate radical in water through adsorption and micro flocculation-filtration, so as to realize deep denitrification and dephosphorization treatment on water. The invention is based on Al0And a reduction-adsorption filtration process of the mineral composite filler, can provide an efficient new method for deeply removing nitrate radical and phosphate radical in water. The system can be flexibly configured in the treatment of specific water bodies, for example, the in-situ treatment of the water bodies can be realized by a bypass circulation mode at the side of a landscape lake or a river channel.
Drawings
Fig. 1 is a schematic diagram (front view) of the system configuration of the present invention.
Fig. 2 is a schematic diagram (top view) of the system configuration of the present invention.
Detailed Description
The embodiments of the present invention will be described in detail below with reference to the drawings and examples.
As shown in fig. 1 and 2, the present invention is a purification treatment system for surface water or urban landscape water, which mainly comprises a reduction reaction unit and an adsorption filtration unit.
Wherein the reduction reaction unit comprises a pH adjusting zone 7 and a reduction reaction zone 3. The pH adjusting zone 7 is directly connected with the inlet water and adjusts the pH of the inlet water to be alkaline, and the reduction reaction zone 3 is filled with a zero-valent aluminum metal filler or a granular filler containing zero-valent aluminum, and mainly has the function of reducing the nitrate radical of the inlet water after the pH adjustment into ammonia and nitrogen in the reduction reaction zone. The particle size and combination mode of the filler can be variously combined according to specific conditions. When the composite filler is adopted, the filling can adopt a combination mode, and the proportion of two or more fillers and the selection of the particle size thereof can be flexibly configured according to specific conditions. The reduction reaction zone 3 can induce the zero-valent aluminum metal to lose electrons by a method of reasonably controlling the pH value, and effectively inhibit the passivation of the metal surface, thereby promoting the nitrate radical reduction reaction. Illustratively, the pH of the feed water can be adjusted to 9-10 in the pH adjusting zone 7, and the pH of the feed water can be stabilized at 8.5-9 when the feed water is discharged from the reduction reaction zone 3 without adding any medicament for adjusting the pH.
The adsorption filtering unit comprises a medical stone filtering layer adsorption area 4 and a zeolite filtering layer adsorption area 5, the medical stone filtering layer adsorption area 4 is positioned right above the zeolite filtering layer adsorption area 5, and the treated water which is discharged from the reduction reaction area 3 sequentially enters the medical stone filtering layer adsorption area 4 and the zeolite filtering layer adsorption area 5 from top to bottom. The medical stone filtering layer adsorption area 4 is filled with medical stone filtering materials, and the zeolite filtering layer adsorption area 5 is filled with zeolite filtering materials. The gradation height and the grain size selection of each layer of the filter material can be flexibly adjusted according to actual conditions. Preferably, under the condition that no medicament is added to adjust the pH, the pH can be adjusted to 6-8 when the zeolite filter material is discharged from the zeolite filter layer adsorption area 5 after the pH neutralization effect of the medical stone filter material and the zeolite filter material.
In the embodiment of the invention, the pH adjusting area 7 comprises a water inlet tank and a pH adjusting medicament device 2, the top of the water inlet tank is provided with a grid 1, inlet water enters the water inlet tank after being filtered by the grid 1, and the grid 1 intercepts solid residues or impurities with larger sizes in the water. The water outlet of the water inlet tank is arranged on the side surface of the bottom, and the water inlet tank flows in an S shape through the vertical partition plate and enters the reduction reaction zone 3 from the bottom of the reduction reaction zone 3. The alkaline liquid medicine in the pH adjusting agent device 2 is added to the water inlet of the water inlet tank through the diaphragm pump and the medicine pipe, the mixing of the alkaline liquid and the water inlet pumped into the water inlet tank is enhanced by utilizing the water dropping effect, and the mixing and stirring effect after the alkaline liquid is added can be further enhanced by the corridor structure formed by the vertical partition plates arranged in the water inlet tank.
Illustratively, the medicament added in the pH adjusting medicament device 2 can be NaOH and Na2CO3Mixed solution of NaOH and Na2CO3The concentration and the substance ratio of the mixed solution are determined according to specific requirements.
In the embodiment of the invention, a water storage buffer zone can be arranged behind the reduction reaction zone 3, the water outlet of the reduction reaction zone 3 is connected with the water storage buffer zone, a water outlet weir is arranged at the top of the water storage buffer zone, and a lifting pump can be arranged in the water storage buffer zone. The water outlet of the water storage buffer zone is connected with a water distributor 8 through a water outlet weir, the water distributor 8 is arranged right above the medical stone filter layer adsorption zone 4 and comprises a plurality of water distribution pipes which are uniformly distributed, holes are uniformly formed below the pipes, and water is delivered to the medical stone filter layer adsorption zone 4.
In the embodiment of the invention, the gravel bearing layer 6 is arranged below the adsorption zone 5 of the zeolite filter layer, and the gradation height from bottom to top can be flexibly adjusted according to specific conditions. The bottom of the gravel supporting layer 6 is connected with a bottom water collecting pipe and a back washing system, the bottom water collecting pipe is used for discharging final treated water, the back washing system (gas, water or combination of gas and water) is used for washing each layer of the adsorption filtering unit, and the back washing period is determined by combining the treatment effect, the head loss and the like.
According to the system, the process flow and the principle of the invention are as follows:
step 1, adjusting the pH of inlet water to be alkaline. NaOH and Na can be added by using a dosing pump and a flowmeter2CO3The mixed solution is used for adjusting the pH value of the inlet water (a pH meter can be arranged on the wall of the tank), thereby ensuring the smooth proceeding of the subsequent treatment. At which the samples can be taken for detection of nitrate, ammonia nitrogen and phosphate in water.
Step 2, feeding the inlet water after pH adjustment into a reduction reaction zone 3 filled with a zero-valent aluminum metal filler or a particle filler containing zero-valent aluminum, and coating nitrate in the water with Al0Reducing into ammonia gas and nitrogen gas, specifically, nitrate radical in water is extracted from aluminum scrap or zero-valent aluminum (Al)0) The filler surface obtains electrons released by the metal simple substance and then is reduced into ammonia gas and a small part of nitrogen gas.
Specifically, since the solution is alkaline, Al on the surface of the filler0Can be reacted with NO3 -Reaction to nitrogen (N)2) Or ammonia (NH)3) Released into the air, partially dissolved NH3Remaining in the water in the form of ammonia nitrogen (reactions 1-3). At the same time, Al is released in the reaction3+Formation of Al (OH)3Then react with OH-React to dissolve (generate metaaluminate (AlO)2 -) (reaction 4). Therefore, onlyThe pH of the solution during the reduction process needs to be controlled in an alkaline range, Al0The passivation of the surface can be effectively suppressed and the reduction reaction of nitrate can be smoothly performed.
3NO3 -+2Al+3H2O→3NO2 -+2Al(OH)3 (1)
NO2 -+2Al+5H2O→NH3+2Al(OH)3+OH- (2)
2NO2 -+2Al+4H2O→N2↑+2Al(OH)3+2OH- (3)
Al(OH)3+OH-→AlO2 -+2H2O (4)
In this step, the pH value of the solution, the concentrations of nitrate, ammonia nitrogen and Al ions can be sampled and measured, and the amount of alkali added for the front-end pretreatment can be adjusted accordingly.
And 3, enabling the water after the reduction reaction to flow into the medical stone filtering layer adsorption area 4 and the zeolite filtering layer adsorption area 5 from top to bottom. Specifically, the water flow can uniformly flow into the surface of the medical stone filter material from top to bottom by utilizing the lift pump and the water distributor 8. The solution flowing out of the reduction reaction zone 3 carries a concentration of metaaluminate (AlO)2 -) Al released by medical stone and zeolite under the condition of not adding medicament to adjust the pH value of the solution3+And AlO2 -The reaction can reach the effect of neutralizing the pH value of the solution, and Al (OH) is generated by the reaction3The floc can remove phosphate radicals in water through micro-flocculation-filtration.
Specifically, the water flow realizes oxygenation and aeration under the action of water drop, and part of ammonia dissolved in the water escapes from the water surface under the action of aeration. And in the process that water flows through the medical stone filter material, H in the water2AlO3 –Al released from the surface of medical stone3+The reaction is carried out to generate aluminum hydroxide floc (reaction 5), the pH value is gradually reduced from 9 to neutral by neutralization, and the aluminum hydroxide floc can absorb phosphate radicals and then is trapped in the medical stone filtering layer adsorption area 4, so that the phosphorus removal effect is achieved, namely the phosphorus removal effect is realized by utilizing the micro-flocculation-filtration effect.
Al3++3AlO2 -+6H2O→4Al(OH)3 (5)
Thereafter, when the water flow passes through the zeolite filter layer adsorption zone 5, the zeolite filter material can remove residual ammonia Nitrogen (NH) in the water through ion exchange4 +) And Al released from the zeolite surface3+Can be continuously mixed with residual H in water2AlO3 -The reaction is carried out and aluminum hydroxide floc is generated to further adsorb phosphate radical in the treated water.
After a period of operation, the exchanged aluminum in the water can be adsorbed on the surface of the filter material in the form of hydrated aluminum ions or hydroxohydrated aluminum ions by the action of electrostatic force. Along with the part of the adsorbed aluminum ions, OH in water can be reacted-The reaction generates aluminum (hydrogen) oxide, the surface of the filter material is gradually loaded with a layer of active filter membrane containing aluminum oxide or aluminum hydroxide (AlO (OH)), and the active filter membrane adsorbs and removes residual phosphate radical in water through surface complexation.
In this step, the Dissolved Oxygen (DO) concentration and pH in the water may be sampled and detected, and the height between the water distributor 8 and the liquid surface may be adjusted accordingly. And periodically measuring the nitrogen and phosphorus pollutant indexes, pH (selecting a test sampling point along the way), head loss and the like of the effluent.
And 4, discharging the water treated by the zeolite filter layer adsorption area 5.
After the 4 steps are carried out and the operation is carried out for a period of time, when water flows through the medical stone-zeolite filter layer, the filter membrane containing Al (hydrogen) oxide formed on the surfaces of the medical stone filter material and the zeolite filter material can absorb phosphate radicals remained in the water, and then the water flows through the gravel bearing layer 6 below and is discharged from the water collecting pipe at the bottom.
And after the operation for a period of time, the backwashing system can be started to flush the filter layer, and flocs and particles intercepted by the adsorption filtration unit are flushed out.
The following is a specific application case of the present invention, which includes two parts of a pilot test experiment and a pilot test experiment.
1. Bench scale experiment
Xi' an cityThe water quality of partial river reach of a river channel is poor V-class water, the total nitrogen is about 4mg/L, the nitrate nitrogen is about 3.2mg/L, the total phosphorus is about 2.6mg/L, continuous water inlet and outlet of a reactor are realized by taking water in a dynamic treatment mode, and the water inlet flow is 1L3And h, the total hydraulic retention time is about 10h, the pH value of inlet water is adjusted to about 9.0 by adding NaOH, then the pH value is not adjusted, the water quality of outlet water can reach the IV-class water standard, the total nitrogen removal rate is about 60 percent, the total phosphorus removal rate is about 84 percent, and the residual nitrate nitrogen, ammonia nitrogen and total phosphorus are about 0.88mg/L, 0.66mg/L and 0.42mg/L respectively. From the laboratory bench test results, it can be known that when the integrated reduction-adsorption filtration reactor is used for treating surface water, the residual NO in the water is treated- 3The removal effect of-N, TN and TP is better, thereby showing that the invention has pilot-scale research value.
2. Pilot plant experiment
The water quality of a certain small lake in Nanchang city of Jiangxi province is poor V-class water, the total nitrogen is about 3.3mg/L, the nitrate nitrogen is about 2.9mg/L, and the total phosphorus is about 2.3mg/L, an integrated pilot-scale reactor is arranged beside the lake, the lake water is extracted to realize continuous water inlet and outlet of the reactor in a dynamic treatment mode, the water inlet flow is 10m3And d, the total hydraulic retention time is about 12 hours, the pH value of inlet water is adjusted to about 9.0 by adding NaOH, the water quality of outlet water can reach the IV-class water standard, the total nitrogen removal rate is about 61 percent, the total phosphorus removal rate is about 79 percent, and the residual nitrate nitrogen, ammonia nitrogen and total phosphorus are about 0.77mg/L, 0.52mg/L and 0.48mg/L respectively. From the field pilot test results, it can be known that the integrated reduction-adsorption filtration reactor treats the surface water with NO-3The removal rates of N, TN and TP are greatly improved, thereby showing that the invention has stronger application value.

Claims (8)

1. A purification treatment system for surface water or urban landscape water is characterized by comprising a reduction reaction unit and an adsorption filtration unit;
the reduction reaction unit comprises a pH adjusting area and a reduction reaction area; the pH adjusting area is connected with inlet water and adjusts the pH of the inlet water to be alkaline, and the reduction reaction area is filled with zero-valent aluminum metal filler or granular filler containing zero-valent aluminum, so that nitrate radical of the inlet water after the pH adjustment is reduced into ammonia gas and nitrogen gas in the reduction reaction area;
the adsorption filtering unit comprises a medical stone filtering layer adsorption area and a zeolite filtering layer adsorption area; the treated water out of the reduction reaction zone sequentially enters the medical stone filter layer adsorption zone and the zeolite filter layer adsorption zone from top to bottom; the medical stone filter layer adsorption area is filled with a medical stone filter material, and the zeolite filter layer adsorption area is filled with a zeolite filter material; h in the treated water2AlO3 –Al released from the surface of medical stone3+Reacting to generate aluminum hydroxide floc, and neutralizing the pH value of the treated water, wherein the aluminum hydroxide floc adsorbs phosphate radicals in the treated water and is trapped in a medical stone filter layer adsorption area; the zeolite filter layer adsorption zone removes residual ammonia nitrogen in water through ion exchange effect, and Al released on the surface of zeolite3+With residual H in water2AlO3 –The reaction is carried out to generate aluminum hydroxide floc so as to further adsorb phosphate radical in the treated water.
2. The purification treatment system for surface water or urban landscape water according to claim 1, wherein the pH adjustment zone comprises a water inlet tank and a pH adjustment agent device, the top of the water inlet tank is provided with a grid, the inlet water is filtered by the grid and then enters the water inlet tank, the water outlet of the water inlet tank is arranged on the side surface of the bottom, the S-shaped flow is carried out through a vertical partition plate, and the inlet water enters the reduction reaction zone from the bottom of the reduction reaction zone.
3. The system of claim 1, wherein the effluent of the reduction reaction zone is connected to a water storage buffer zone, the top of the water storage buffer zone is provided with an effluent weir, the effluent of the water storage buffer zone is connected to a water distributor through the effluent weir, and the water distributor is arranged right above the Maifanitum filter layer adsorption zone.
4. The system of claim 1, wherein a gravel supporting layer is arranged below the adsorption zone of the zeolite filtering layer, the bottom of the gravel supporting layer is connected with a bottom water collecting pipe and a back washing system, the bottom water collecting pipe is used for discharging final treated water, and the back washing system is used for washing each layer of the adsorption filtering unit.
5. A purification treatment process for surface water or urban landscape water is characterized by comprising the following steps:
step 1, adjusting the pH of inlet water to be alkaline;
step 2, feeding the inlet water after pH adjustment into a reduction reaction zone filled with a zero-valent aluminum metal filler or a particle filler containing zero-valent aluminum, and coating nitric acid radicals in the water with Al0Reducing the ammonia gas into ammonia gas and nitrogen gas, wherein the nitrogen gas and a part of the ammonia gas are released into the air, and the other part of the ammonia gas is dissolved and remains in the water in the form of ammonia nitrogen;
step 3, the water after the reduction reaction flows into the medical stone filtering layer adsorption area and the zeolite filtering layer adsorption area from top to bottom, and H in the water2AlO3 –Al released from the surface of medical stone3+Reacting to generate aluminum hydroxide floc, and neutralizing the pH value of the treated water, wherein the aluminum hydroxide floc adsorbs phosphate radicals in the treated water and is trapped in a medical stone filter layer adsorption area; the zeolite filter layer adsorption zone removes residual ammonia nitrogen in water through ion exchange effect, and Al released on the surface of zeolite3+With residual H in water2AlO3 –Reacting to generate aluminum hydroxide floc to further adsorb phosphate radical in the treated water;
and 4, discharging the water treated by the adsorption area of the zeolite filter layer.
6. The purification treatment process for surface water or urban landscape water according to claim 5, wherein in the step 1, the pH of the inlet water is adjusted to 9-10, and in the case of adjusting the pH without adding any medicament, in the step 2, the pH is 8.5-9 when the outlet water exits the reduction reaction zone, and the pH is 6-8 when the outlet water exits the zeolite filter layer adsorption zone.
7. The process of claim 5, wherein in step 3, an active filter membrane containing aluminum oxide or aluminum hydroxide is gradually loaded on the surfaces of the Maifanitum filter material in the Maifanitum filter layer adsorption region and the zeolite filter material in the zeolite filter layer adsorption region along with the operation of the process, and the active filter membrane adsorbs and removes the residual phosphate radicals in the water through surface complexation.
8. The process of claim 5, wherein the Maifanitum filter layer adsorption region and the zeolite filter layer adsorption region are backwashed by a backwash system during operation of the process.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115583761A (en) * 2022-10-31 2023-01-10 西安建筑科技大学 Cross-flow biological filter system and nitrogen and phosphorus removal method
CN116174700A (en) * 2022-11-16 2023-05-30 上海大学 Preparation method and application of high-activity zero-valent metal aluminum powder

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