CN112159034A - Autotrophic anti-blocking constructed wetland for deep purification of tail water of sewage treatment plant - Google Patents

Autotrophic anti-blocking constructed wetland for deep purification of tail water of sewage treatment plant Download PDF

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CN112159034A
CN112159034A CN202010983154.2A CN202010983154A CN112159034A CN 112159034 A CN112159034 A CN 112159034A CN 202010983154 A CN202010983154 A CN 202010983154A CN 112159034 A CN112159034 A CN 112159034A
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water
wetland
autotrophic
area
purification
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高镜清
李强
黄真真
班亚飞
张敬申
段浩宇
王文垅
周昊昕
李林帅
尚娜
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Zhengzhou Yuanzhihe Environmental Protection Technology Co ltd
Zhengzhou University
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Zhengzhou Yuanzhihe Environmental Protection Technology Co ltd
Zhengzhou University
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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
    • C02F2001/007—Processes including a sedimentation step
    • 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
    • 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
    • C02F2101/30—Organic compounds
    • C02F2101/38—Organic compounds containing nitrogen
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/14—Maintenance of water treatment installations
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2305/00—Use of specific compounds during water treatment
    • C02F2305/06—Nutrients for stimulating the growth of microorganisms
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/28—Anaerobic digestion processes
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/32—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used

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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)
  • Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)

Abstract

The invention relates to an autotrophic anti-clogging constructed wetland for deep purification of tail water of a sewage treatment plant, which comprises a water purification plant, a water collection area, a core functionalized filler matrix area, a cobble layer and a water distribution and sludge discharge area which are sequentially arranged from top to bottom, wherein the water distribution and sludge discharge area comprises a perforated support plate, a multi-bucket V-shaped sludge collection groove and support columns, and the support columns are fixed at the bottom of the wetland and support the perforated support plate; the lower part of the multi-bucket V-shaped mud collecting groove is filled with large cobbles; the upper part of the perforated supporting plate is provided with a core functional filler matrix area, the bottom of the perforated supporting plate is ensured to be uniformly filled with water by a cobble layer, the upper part of the core functional filler matrix area is planted with purification plants, a drain pipe is arranged in a water collecting area, and tail water after collection and treatment is dischargedAnd (5) wetland treatment. The artificial wetland can solve the problem of NO in tail water of the existing sewage treatment plant3The concentration of N is higher, the concentration of phosphorus needs to be further reduced, and the autotrophic wetland has serious hardening of matrix, system blockage and the like in the long-term operation of the actual engineering.

Description

Autotrophic anti-blocking constructed wetland for deep purification of tail water of sewage treatment plant
Technical Field
The invention belongs to the technical field of advanced wastewater treatment, and particularly relates to an autotrophic anti-clogging constructed wetland aiming at advanced purification of tail water of a sewage treatment plant.
Background
In recent years, with the rapid development of social economy and the continuous improvement of the urbanization degree of China, the discharge amount of sewage is high, but due to the limitation of water treatment technology, the water quality indexes of nitrogen, phosphorus and the like after the urban domestic sewage is treated by a sewage plant cannot meet the national regulation of quality standards for surface water environment, and the direct discharge of the tail water of the sewage plant into rivers and lakes can cause serious water eutrophication and algae outbreak and further harm the water environment safety. Therefore, the tail water of the sewage treatment plant needs to be further deeply treated, so that the environmental risk is reduced, and how to remove the nutrient elements such as nitrogen and phosphorus in the tail water of the sewage treatment plant becomes a significant problem faced by the water treatment in China at present.
Although the traditional treatment process can realize high-efficiency nitrogen and phosphorus removal, the traditional treatment process has the defects of high treatment cost, high maintenance cost, large environmental risk and the like. The artificial wetland process has been a hot point of research in recent years due to low construction cost, low operation cost, large treatment capacity, resistance to water impact and good environmental benefits. In addition, the artificial wetland technology has good ecological effect and certain economic effect, and simultaneously has no problem of large amount of sludge treatment of the traditional treatment process, thereby becoming the primary technology selection for deep treatment of the tail water of the sewage plant.
The removal efficiency of TN (total nitrogen) by the subsurface flow wetland in the traditional constructed wetland system is generally about 30-40%, the treatment efficiency of a surface flow system (low load) is more than 50%, the C/N of tail water of a sewage plant is less than or equal to 2, heterotrophic denitrification is difficult to culture, so that the denitrification efficiency is low, and in order to improve the efficiency, corncob particles or organic matters such as methanol, ethanol and the like are added into the system so as to improve the denitrification efficiency. But the cost is inevitably high, and the secondary pollution to the water quality of the outlet water of the whole system is easily caused by excessive addition. If solid-phase carbon is added, the whole wetland system can be blocked, the effluent turbidity can be increased, and the like.
Compared with heterotrophic denitrification, autotrophic denitrification has the characteristics of large hydraulic load, high efficiency, low sludge production, less temperature influence on dominant strains and the like, and is very suitable for advanced wastewater treatment. In the autotrophic denitrification system, the electron donors are generally classified into two main groups: firstly, a hydrogen autotrophic denitrification technology taking hydrogen base as an electron donor; secondly, sulfur autotrophic denitrification technology using sulfur (S) and the like as electron donors. In the hydrogen autotrophic denitrification technique, hydrogen (H)2) The supply of (a) and the effective area of denitrification on the hydrogen and packing are the main factors affecting the denitrification rate. The hydrogen is expensive and is not suitable for arrangement, and the treatment effect of the whole system is poor if the hydrogen production system is not arranged properly; compared with a hydrogen autotrophic denitrification technology, the sulfur autotrophic denitrification system has the advantages of easier arrangement of the filler matrix, low manufacturing cost, convenient operation and management and high treatment efficiency. The advantages lead the application of the sulfur autotrophic denitrification technology in the field of sewage treatment, in particular to the NO of the tail water of a sewage treatment plant3Deep removal of-N, and good development and application prospects. But at the same time, the sulfur autotrophic technology causes the pH value and SO in the effluent to be too low4 2-Too high, etc., and also has the disadvantage of not being negligible, SO that monitoring of SO is required during the treatment4 2-Not only the addition amount of the sulfur source needs to be accurately controlled, but also the SO needs to be reduced by other means such as adsorption and precipitation and the like as much as possible4 2-Concentration of (2) to prevent SO from appearing4 2-And (5) exceeding the standard. Research finds that when a sulfur source is selected to be combined with siderite and self-made polyaluminium chloride residue composite filler (baking-free filler made of slag portland cement, polyaluminium chloride residue, bentonite and the like) is added, the autotrophic denitrification high-efficiency denitrification phosphorus removal effect is achieved, hydrogen ions generated in the autotrophic denitrification process can be neutralized, the pH value can be adjusted automatically, and SO in effluent can be reduced4 2-The concentration of (c).
The application number is 201510067571.1's patent discloses an improve sewage treatment plant tail water nitrogen and phosphorus removal effect and avoid biological undercurrent wetland system who blocks up, including the water distribution district that sets gradually, purifying area and catchment area, the inlet tube is connected in the water distribution district, and the outlet pipe is connected in the catchment area, places sulphur lime stone mixture matrix, gravel matrix and zeolite matrix after to according to the rivers direction in the past in proper order in the purifying area. Compared with other technologies, the method combines the subsurface flow wetland and the sulfur autotrophic denitrification to remove the nitrate in the inlet water, and simultaneously utilizes the limestone in the mixed matrix to remove the phosphate in the inlet water. However, the application of limestone may increase the hardness of effluent, sulphur particles in the wetland are difficult to be consumed and supplemented with the reaction, the low specific surface area of the sulphur particles is not favorable for the attachment and mass transfer of microorganisms, and the denitrification effect is not easy to control.
The patent application No. 201710371963.6 discloses a slow-release electron donor and a method for deep denitrification of sewage by using the same. The slow-release electron donor comprises a compound consisting of siderite and sulfur in a volume ratio of 1: 10-5: 1. Through optimization, the siderite and the sulfur are respectively ground into particles with the diameter of 0.1-0.5 mm and are uniformly mixed for useAnd the filler such as microporous hollow balls is added as the filler of the biological filter. However, if siderite and sulfur are directly applied to the constructed wetland, SO of effluent can be caused4 2-The concentration exceeds the standard, and the filler matrixes such as siderite and the like are easy to harden along with the extension of the running time, so that the treatment effect is greatly reduced, and the popularization and the application of the filler matrixes in the constructed wetland are seriously limited.
Disclosure of Invention
The invention mainly aims to solve the problem of NO in tail water of the existing sewage treatment plant3The method develops an autotrophic denitrification process which takes sodium thiosulfate as a sulfur source, siderite as a buffering agent and an inorganic carbon source and plays a certain role of an electron donor, and adds a self-made polyaluminium chloride residue composite filler (a baking-free filler made of slag portland cement, polyaluminium chloride residue, bentonite and the like) as an SO generated in the process of reinforcing raw material adsorption treatment4 2-And phosphate in the tail water are used as the autotrophic anti-blocking vertical flow constructed wetland for deep purification of the tail water of the sewage treatment plant, so that the problems of the existing nitrogen and phosphorus removal process can be well solved, and the technical effect is good.
In order to achieve the purpose, the invention adopts the technical scheme that:
the autotrophic anti-blocking constructed wetland comprises a water purification plant, a water collection area, a core functionalized filler matrix area, a cobble layer and a water distribution sludge discharge area which are sequentially arranged from top to bottom, wherein the water distribution sludge discharge area comprises a perforated support plate, a channel, a multi-bucket V-shaped sludge collection groove and a support column; the lower part of the multi-bucket V-shaped sludge collection groove is filled with large cobbles to form a cobble filling area, and the multi-bucket V-shaped sludge collection groove is connected with a sludge discharge pipe; the upper part of the perforated supporting plate is provided with a core functionalized filler matrix area, the bottom of the core functionalized filler matrix area is ensured to be uniformly filled with cobblestone layers, the core functionalized filler matrix area comprises siderite, ceramsite and polyaluminium chloride residue composite filler, the upper part of the core functionalized filler matrix area is planted with purification plants, a drain pipe is arranged in a water collecting area, and the treated tail water is collected and discharged out of the wetland.
Preferably, the volume ratio of the siderite, the ceramsite and the polyaluminium chloride residue composite filler in the core functionalized filler matrix zone is 1:1:0.5, the particle size of the mixed matrix is 2-4cm, and the hydraulic retention time is 2-6 h.
Preferably, the slope i of the multi-bucket type V-shaped mud collection trough is 0.05-0.07.
Preferably, the water purifying plant is one or more of reed, polygonum hydropiper, marshmallow, Siberian iris and Pinna sikokiana.
Preferably, the wetland feed water is added relative to NO31.5 times the theoretical amount of sodium thiosulfate added, relative to the total amount of N.
Preferably, the polyaluminium chloride residue composite filler is a baking-free filler composed of polyaluminium chloride residue, portland slag cement, bentonite and the like, and specifically comprises the following components: 40-50 parts of slag portland cement, 45-55 parts of polyaluminium chloride residues and 7-9 parts of bentonite, wherein the solid raw materials and the water are uniformly mixed according to the weight ratio of 1:0.4-0.7, and then the mixture is pressed by a ball press to form 2-4cm cake-shaped small-ball polyaluminium chloride residue composite filler.
Preferably, the wetland is added with the sludge in the anaerobic tank of the sewage treatment plant into the autotrophic denitrifying microorganism enrichment culture solution before the wetland is started, and the sludge is inoculated into the wetland system after being cultured for 7 days. Further, the culture solution comprises the following components in percentage by weight: na (Na)2S2O3·5H2O 178mg/L，KNO386mg/L，KH2PO 4 4.4mg/L，NH4Cl 3.92mg/L，MgCl2·6H 2O 0.03mg/L，FeSO4·7H 2O 0.01mg/L。
Compared with the prior art, the invention has the beneficial effects that:
1. the invention can treat NO in tail water in the conventional artificial wetland3Water quality characteristics with higher N concentration, treatmentIn the process, a carbon source needs to be added, more sludge is generated in the heterotrophic denitrification process, the problems of hardening, blockage and the like of a filler matrix are easily caused in the autotrophic artificial wetland, and the autotrophic anti-blocking artificial wetland for deep purification of the tail water of the sewage treatment plant is innovatively provided.
2. The invention combines the innovation of autotrophic denitrification, adopts siderite and sodium thiosulfate as main raw materials of autotrophic denitrification, uses the self-made polyaluminium chloride residue composite filler as a reinforcing raw material, treats tail water of a certain sewage treatment plant on the basis of a small experiment, and provides the optimal addition amount of the sodium thiosulfate on the basis of meeting the relevant standard and economy of surface water.
3. The invention applies the self-made polyaluminium chloride residue composite filler to the constructed wetland for the first time, which not only has better dephosphorization effect, but also effectively reduces SO in the effluent4 2-The concentration of (c).
4. The invention creatively correlates the water inlet pipe and the water outlet pipe, ensures the relative independence of the water inlet system and the water outlet system in the operation process and plays a better role in the action processes of flushing and the like through the control of the valve.
5. The invention utilizes the principle of the communicating vessel to connect the dosing tank (sodium thiosulfate) with the water outlet pipe, reduces the use of the water pump, saves energy, and automatically controls the water surface of the dosing tank.
6. The invention has the advantages of low treatment cost, good effluent quality, simple operation and management, small occupied area, difficult blockage and hardening, high engineering practical value and the like, can realize long-term high-efficiency stable operation of the system compared with other related patents, and has better self-regulation pH value and dephosphorization effect when the siderite and the self-made polyaluminium chloride residue composite filler are used.
Drawings
FIG. 1 is a schematic cross-sectional structure view of the constructed wetland of the invention;
FIG. 2 is a schematic view of the arrangement of holes on the water inlet pipe according to the present invention;
FIG. 3 is a schematic diagram of a water inlet pipe and a water distribution pipe network structure according to the present invention;
FIG. 4 is a schematic view of a water distribution pipe network structure of a water outlet pipe according to the present invention;
FIG. 5 shows the NO addition at different sodium thiosulfate dosages in example 1 of the present invention3-N removal effect map;
in the figure: 1. the device comprises water purification plants, 2, a water collection area, 3, a core functional filler matrix area, 4, a cobble layer, 5, a perforated support plate, 6, a channel, 7, a multi-bucket type V-shaped mud collection groove, 8, a support column, 9, a cobblestone filling area, 10, a water inlet pipe, 11, a water outlet pipe, 12, a first valve, 13, a second valve, 14, a third valve, 15, a fourth valve, 16, a fifth valve, 17, a hole, 18, a dosing tank, 19, a stirrer, 20, a sixth valve, 21 and a metering pump.
Detailed Description
In order to make the objects, construction schemes and advantages of the present invention clearer, the following description and illustration of specific embodiments of the present invention are made with reference to the accompanying drawings, and the present invention is not limited thereto.
Example 1
The embodiment provides a novel autotrophic anti-blocking vertical flow constructed wetland that sewage treatment plant tail water deep purification, and the structure is as shown in fig. 1, including water purification plant 1, catchment area 2, core functionalization filler matrix district 3, cobblestone layer 4, water distribution row mud district, the dosing tank 18 that set gradually from the top down, water distribution row mud district is including perforation backup pad 5, passageway 6, many fill type V type mud collecting tank 7, support column 8, and inlet tube 10 arranges in the water distribution row mud district, at wetland bottom fixed stay post 8, support column 8 supports perforation backup pad 5, arranges passageway 6 on the perforation backup pad 5. In order to enable sludge at the bottom of the pond to smoothly slide into a sludge hopper and reduce the depth of the pond, the sludge is collected by a plurality of multi-hopper type V-shaped sludge collecting grooves 7 of a reinforced concrete structure, the gradient i is 0.05-0.07, the lower parts of the multi-hopper type V-shaped sludge collecting grooves 7 are filled with large cobblestones to form cobblestone filling areas 9, and the multi-hopper type V-shaped sludge collecting grooves 7 are connected with sludge discharge pipes for discharging the sludge from the multi-hopper type V-shaped sludge collecting grooves 7; and laying an anti-seepage geomembrane at the bottom of the wetland. A stirrer 19 is arranged in the dosing tank 18, and the dosing tank 18 is connected with the water inlet pipe 10 through a sixth valve 20 and a metering pump 21.
In this embodiment, the upper portion of the perforated support plate 5 is provided with an autotrophic denitrification functional zone of a multi-dimensional filler matrix, namely a core functionalized filler matrix zone 3, the bottom of the core functionalized filler matrix zone 3 is ensured to be uniformly fed with water by a cobblestone layer 4, the core functionalized filler matrix zone 3 comprises siderite, ceramsite and self-made polyaluminium chloride residue composite filler, the upper portion of the core functionalized filler matrix zone 3 is planted with a purification plant 1, a drain pipe 11 is arranged in the water collection zone 2, and the treated tail water is collected and discharged out of the wetland. In the embodiment, the volume ratio of the siderite, the ceramsite and the polyaluminium chloride residue composite filler in the core functionalized filler matrix area 3 is 1:1:0.5, the particle size of the mixed matrix is 2-4cm, and the hydraulic retention time is 2-6 h. The siderite can be used as a pH buffering agent and an inorganic carbon source on one hand, and can be used as an electron donor to directly participate in a denitrification process on the other hand, so that the siderite has a certain phosphorus removal effect; the self-made polyaluminium chloride residue composite filler has the functions of stabilizing pH and efficiently removing phosphorus.
In this embodiment, the self-made polyaluminium chloride residue composite filler is a baking-free filler composed of polyaluminium chloride, portland slag cement, bentonite, and the like, and specifically includes: 44 parts of Portland slag cement, 49 parts of polyaluminium chloride residues and 7 parts of bentonite, wherein the solid mixed raw materials and the water are uniformly mixed according to the weight ratio of 1:0.5, and then the mixture is pressed by a ball press to form a 3cm cake-shaped small-ball polyaluminium chloride residue composite filler.
The flow direction in the wetland is designed in a mode from bottom to top, the third valve 14 is closed when the wetland operates, the first valve 12, the second valve 13, the fourth valve 15, the fifth valve 16 and the sixth valve 20 are opened, tail water enters the water distribution and sludge discharge area through the water inlet pipe 10 to precipitate impurities and uniformly distribute water power, the impurities are precipitated and then slide into the multi-bucket V-shaped sludge collection tank 7, the precipitated tail water enters the core functional filler matrix area 3 through the perforated support plate 5, under the combined action of autotrophic microorganisms such as thiobacillus denitrificans, the filler matrix, the water purification plants 1 and the like, nutrients such as nitrogen, phosphorus and the like in the tail water are purified, and finally, the tail water is discharged through the water outlet pipe 11 in the water collection area 2, the required amount of sodium thiosulfate is calculated and determined, and is accurately added into the system through the metering pump 21. In this embodiment, the water inlet pipe 10 and the water outlet pipe 11 are both provided with holes 17, as shown in fig. 2 in detail.
The flushing and backwashing period is 35-60 d. In the embodiment, the backwashing period is determined to be 50d through measuring and calculating the water head loss, the first valve 12, the second valve 13, the fifth valve 16 and the sixth valve 20 are closed, the third valve 14 and the fourth valve 15 are simultaneously opened, the wetland system is backwashed, the core functionalized filler matrix area 3 is loosened, the biofilm falling off from the filler and the sediment generated by reaction return to the water distribution and sludge discharge system under the backwashing effect, and the impurities, the biofilm falling off and the sediment generated by reaction and the like are discharged out of the artificial wetland through the sludge discharge pipe under the hydrostatic pressure effect, so that the purposes of deep purification, hardening prevention and blockage are achieved. The invention not only makes full use of the autotrophic denitrification deep purification tail water, but also can exchange and flush through the valve and discharge mud in time, thereby solving the problem of serious hardening and blockage of iron filler matrix existing in the autotrophic constructed wetland for a long time and ensuring that the constructed wetland always keeps stable treatment effect. Meanwhile, the water inlet pipe and the water discharge pipe are mutually associated, the relative independence of a water inlet system and a water outlet system is ensured through the control of the valve in the running process, and better cooperativity is exerted in the action processes of flushing and the like. The water inlet pipe and the water outlet pipe adopt the same water distribution mode and correspond to each other up and down, so that dead zones in the wetland system are effectively avoided, as shown in fig. 3 and 4.
In the embodiment, the wetland is firstly added with the sludge in the anaerobic tank of the sewage treatment plant into the autotrophic denitrifying microorganism enrichment culture solution before the wetland is started, and the culture solution comprises the following components in percentage by weight: na (Na)2S2O3·5H2O 178mg/L，KNO3 86mg/L，KH2PO 4 4.4mg/L，NH4Cl3.92mg/L，MgCl2·6H 2O 0.03mg/L，FeSO4·7H 2O0.01 mg/L, inoculating to a wetland system after culturing for 7d, and performing high-throughput sequencing after stable operation to show that: the wetland substrate filler mainly comprises Thiobacillus denitrificans and Ferritophicum ferrooxidans.
The thiobacillus denitrificans attached in the core functionalized filler matrix area 3 is dissolved inReduction of NO by sodium thiosulfate in water3The reduced sulfur in the-N, sodium thiosulfate is oxidized into sulfate, and the self-made polyaluminium chloride residue composite filler has better dephosphorization effect, can remove partial sulfate and reduce SO in the effluent4 2-While siderite can not only neutralize H generated by autotrophic denitrification+The buffer has a certain buffering effect on acidic inlet water, and also has a certain removal effect on phosphate in the inlet water. The optimized water purifying plant plays a role in further purification, and the hydraulic retention time is 2.5 h. In the embodiment, the water purifying plants are one or more of reed, polygonum hydropiper, marshmallow, Siberian iris, and Pinna sida.
Example 2
In this example, the optimum amount of sodium thiosulfate added to the influent water of the autotrophic denitrification zone of the constructed wetland system in example 1 was mainly studied, and the denitrification effect of the filter was determined by adding 1, 1.5, 2 and 2.5 times of the theoretical amount of sodium thiosulfate, and the optimum amount of sodium thiosulfate was determined by analyzing the denitrification effect and economy of different amounts of sodium thiosulfate. The NO of the inlet water is measured in the experimental research process3 -The concentration of N is about 7.0mg/L, the concentration of TN of the inlet water is about 7.5mg/L, and the hydraulic retention time is 2.5 h.
Combining the experimental results and analysis of FIG. 5, 1mg NO was removed according to the equation of autotrophic denitrification reaction with sodium thiosulfate3 -N will yield 11.538mg of SO4 2-. Under the principle of considering the cost and ensuring the denitrification effect, the optimal addition amount of the sodium thiosulfate in the wetland inlet water is 1.5 times of the theoretical value.
Example 3
The embodiment mainly explores the purification effect of the autotrophic anti-blocking vertical flow constructed wetland in the embodiment 1 on the tail water of the actual sewage treatment plant. The inlet water is tail water of a certain sewage treatment plant, 1.5 times of theoretical adding amount of sodium thiosulfate is added, the tail water is uniformly stirred and then pumped into the inlet pipe, relevant indexes of the inlet water are shown in table 1, the hydraulic retention time HRT is 2.5h, and the deep purification effect of the autotrophic vertical flow artificial wetland in the stable operation period is inspected.
By combining the experimental results and analysis of the table 1, the constructed wetland has good deep purification effect on the tail water of the sewage treatment plant, the effluent quality is far superior to the standard II of the surface water, and the SO in the effluent is effectively reduced4 2-Theoretical yield.
TABLE 1 wetland indexes of water inlet and outlet average concentration and treatment efficiency
Total suspended matter Total nitrogen NO3-N Total phosphorus CODmn SO4 2-
Inflow (mg/L) 53 7.5 7 0.2 19 40
Water outlet (mg/L) 4.2 0.349 0.2 0.06 5 80
Removal Rate (%) 92.1 95.6 97.1 70 73 -
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (8)

1. The autotrophic anti-blocking constructed wetland is characterized by comprising a water purification plant, a water collection area, a core functionalized filler matrix area, a cobble layer and a water distribution and sludge discharge area which are sequentially arranged from top to bottom, wherein the water distribution and sludge discharge area comprises a perforated support plate, a channel, a multi-bucket V-shaped sludge collection groove and a support column; the lower part of the multi-bucket V-shaped sludge collection groove is filled with large cobbles to form a cobble filling area, and the multi-bucket V-shaped sludge collection groove is connected with a sludge discharge pipe; the upper part of the perforated supporting plate is provided with a core functionalized filler matrix area, the bottom of the core functionalized filler matrix area is ensured to be uniformly filled with cobblestone layers, the core functionalized filler matrix area comprises siderite, ceramsite and polyaluminium chloride residue composite filler, the upper part of the core functionalized filler matrix area is planted with purification plants, a drain pipe is arranged in a water collecting area, and the treated tail water is collected and discharged out of the wetland.
2. The autotrophic anti-clogging constructed wetland for deep purification of sewage treatment plant tail water according to claim 1, characterized in that the volume ratio of siderite, ceramsite and polyaluminium chloride residue composite filler in the core functionalized filler matrix zone is 1:1:0.5, the particle size of the mixed matrix is 2-4cm, and the hydraulic retention time is 2-6 h.
3. The autotrophic anti-clogging constructed wetland for deep purification of wastewater treatment plant tailwater according to claim 1, wherein the slope i =0.05-0.07 of the multi-bucket V-shaped sludge trough.
4. The autotrophic anti-clogging constructed wetland for deep purification of tail water from sewage treatment plants according to claim 1, wherein the water purification plants are one or more of reed, polygonum hydropiper, marshmallow, Siberian iris, and Nostoc communis.
5. The autotrophic anti-clogging constructed wetland for advanced wastewater treatment plant tailwater purification according to claim 1, wherein the wetland influent water is supplemented with NO relative to NO31.5 times the theoretical amount of sodium thiosulfate added, relative to the total amount of N.
6. The autotrophic anti-clogging constructed wetland for deep purification of sewage treatment plant tail water according to claim 1, wherein the polyaluminium chloride residue composite filler is a baking-free filler consisting of polyaluminium chloride residue, Portland slag cement and bentonite, and specifically comprises: 40-50 parts of slag portland cement, 45-55 parts of polyaluminium chloride residues and 7-9 parts of bentonite, wherein the solid raw materials and the water are uniformly mixed according to the weight ratio of 1:0.4-0.7, and then the mixture is pressed by a ball press to form 2-4cm cake-shaped small-ball polyaluminium chloride residue composite filler.
7. The autotrophic anti-clogging constructed wetland for deep purification of tail water from sewage treatment plants according to claim 1, wherein the wetland is characterized in that anaerobic tank sludge from the sewage treatment plants is added into the autotrophic denitrifying microorganism enrichment culture solution before the wetland is started, and the sludge is inoculated into the wetland system after being cultured for 7 days.
8. The autotrophic anti-clogging constructed wetland for advanced purification of wastewater from sewage treatment plants according to claim 7, wherein the culture solution comprises the following components in percentage by weight: na (Na)2S2O3·5H2O 178mg/L，KNO3 86mg/L，KH2PO 4 4.4mg/L，NH4Cl 3.92mg/L，MgCl2·6H 2O 0.03mg/L，FeSO4·7H 2O 0.01mg/L。
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