483 results about "Constructed wetland" patented technology

The invention relates to a Fenton-like functional filler which is prepared from 10-20% of iron particles coated with a carbonized film, 10-20% of aluminum sulfate modified straw, 20-30% of PBAT-coated calcium peroxide, 20-30% of diatomite and 10-30% of an adhesive. A processing method of a Fenton-like functional filler comprises the following steps: uniformly mixing iron particles coated with a carbonized film, aluminum sulfate modified straws, PBAT-coated calcium peroxide and diatomite, then adding an adhesive, mixing isocyanate serving as the adhesive with polyol according to a volume ratio of 1: 5, and continuously and uniformly mixing; then the mixed raw materials are injected into a mold coated with a release agent in advance, the mold temperature ranges from 40 DEG C to 60 DEG C, the foaming curing time ranges from 15 min to 20 min, and the Fenton-like functional filler can be obtained. The invention relates to an application of a Fenton-like functional filler in constructed wetlands. The method has the beneficial effects that the method is not influenced by temperature, and the removal effect of the constructed wetland on nitrate nitrogen and refractory COD (Chemical Oxygen Demand) can be obviously enhanced.

The invention provides a low-carbon modular artificial wetland system and a carbon sink collaborative purification method thereof, and relates to the technical field of artificial wetlands, the low-carbon modular artificial wetland system comprises a modular box body, and a water inlet layer, a carbon sink layer and a purification layer which are sequentially arranged in the modular box body from top to bottom; the water inlet layer is used for filtering suspended matters through coarse sand; the carbon sequestration layer is used for adsorbing carbon dioxide through biochar and carbon sequestration microorganisms, and meanwhile, the carbon sequestration capacity is enhanced through the plant-microorganism synergistic effect; the purification layer is used for purifying a water body through an iron-based phosphorus removal material and a zeolite denitrification filler. The technical problems of low-carbon material selection, carbon sink potential excavation, renewable energy source coupling and greenhouse gas emission inhibition of an existing constructed wetland system are solved, the technical effects of efficient sewage purification and carbon emission reduction are achieved, and a carbon emission reduction closed loop of the whole life cycle is achieved.

The invention relates to the technical field of environmental engineering, in particular to an intelligent operation management platform and method for a tail water constructed wetland of a large sewage plant, and the operation management platform comprises a monitoring system device which is used for collecting wetland monitoring data in real time, and transmitting the collected wetland monitoring data to an analysis and storage module; the analysis storage module is used for analyzing the wetland monitoring data to obtain structured monitoring parameter data; the operation scheduling management module comprises a scheme management unit used for storing a plurality of regulation and control schemes; the operation control unit is used for regulating and controlling the regulation and control object equipment by adopting preset scheduling logic according to the current monitoring parameter data and the regulation and control scheme; the operation and maintenance management unit is used for sending an inspection work order to a mobile terminal of a corresponding operation and maintenance worker according to a preset inspection plan; and the evaluation module is also used for receiving the inspection result data reported and sent by the mobile terminal of the operation and maintenance personnel and evaluating the inspection result data by adopting a preset rule to obtain an evaluation result.

The invention relates to the technical field of sewage treatment, and discloses an intelligent regulation type constructed wetland nitrogen and phosphorus removal control method, which comprises the following steps: S1, collecting constructed wetland multi-dimensional operation parameter data, and generating water quality dynamic monitoring data, plant physiological status data and microbial activity characteristic data; s2, calculating a pollutant removal efficiency index based on the water quality dynamic monitoring data, and generating nitrogen and phosphorus removal efficiency evaluation data; by integrating multi-dimensional operation parameter acquisition and acquiring water quality, plant physiological status and microbial activity data in real time, comprehensive perception of the operation state of the wetland system is realized, the integrity and real-time performance of system monitoring are ensured, collaborative analysis and intelligent decision are performed based on multi-source data, the pollutant removal efficiency is identified, and the system has a wide application prospect. The evaluation precision of the operation state of the wetland system is improved, and a basis is provided for subsequent regulation and control.

The invention discloses an enhanced denitrification method and device for a constructed wetland with a high-void-ratio filler, and aims to create favorable conditions for deep nitrification by screening light materials and constructing a high-low-high gradient resistance layer and inducing flow velocity differentiation to form an oxygen concentration fluctuation zone. Function switching type microorganisms with nitrification-denitrification bidirectional conversion capacity are cultured, and a seasonal flora switching mechanism and a complementary symbiotic network are established to adapt to annual temperature change; multi-point distributed water supply is designed to form a river branch type water flow path, and bionic water flow distribution is achieved; the periodic change of the water level of pulsating water inlet is used for driving gas exchange in the filler to form a tidal breathing effect, and deep oxygen supply can be realized without mechanical aeration; and real-time monitoring is carried out based on an intermittent operation time table, and operation parameters are dynamically optimized. According to the invention, the problems of limited oxygen transfer and seasonal performance fluctuation of the traditional constructed wetland are solved, and a technical scheme with low energy consumption and high stability is provided for nitrogen-containing wastewater treatment.

The invention discloses a multi-stage composite constructed wetland construction method based on micro-ecological optimization, and relates to the technical field of constructed wetland ecological restoration. According to the method, fluctuation characteristics of pollutant concentration and hydraulic load and coupling risks of the fluctuation characteristics are systematically and quantitatively recognized, a high-disturbance risk area and an induction succession area are accurately divided, and a multi-stage composite constructed wetland is constructed. The micro-ecological state and succession potential of the wetland are dynamically monitored and evaluated, the wetland type layout is scientifically regulated and controlled on the basis of the hydraulic path resistance index, the non-linear impact of pollution impact on micro-ecology is effectively relieved, the ecological self-repairing capacity and toughness of the wetland system are improved, the function passivation phenomenon is avoided, and the method is suitable for large-scale popularization and application. Meanwhile, the resource allocation efficiency and the pollution treatment effect are improved, the operation and maintenance cost is reduced, and the adaptability and continuous purification capacity of the constructed wetland to the complex polluted water body are remarkably enhanced.

The invention relates to the technical field of wetland ecological engineering, and discloses a constructed wetland comprehensive development system and method, computer equipment, a medium and a product, and the system comprises a multi-business collaborative coupling physical space configuration layer which is used for carrying out function division and space facility layout design in a target wetland region based on a multi-business collaborative coupling principle, a multi-business infrastructure is constructed based on function partition and spatial layout design; and the dynamic regulation and control center is in communication connection with the multi-business-state collaborative coupling physical space configuration layer, and the dynamic regulation and control center is used for collecting multi-source data of the multi-business-state collaborative coupling physical space configuration layer, monitoring the multi-business-state collaborative coupling physical space configuration layer in real time based on the multi-source data, dynamically coordinating operation of each business state and optimizing resource configuration. According to the invention, multi-business deep fusion is realized, intelligent dynamic regulation and control capability is realized, long-term stable operation of the system is guaranteed, and comprehensive economic, ecological and social benefits are improved.

The invention discloses a composite artificial wetland system, and relates to the technical field of artificial wetlands. The composite artificial wetland system comprises an ecological pool, and a surface flow wetland unit, a horizontal subsurface flow wetland unit, an internal circulation system unit and plant ecological buffer zone units around the wetland are arranged in the ecological pool; the surface flow wetland unit comprises a wetland water inlet pipe and a wetland water outlet pipe which are arranged on the two sides of the ecological pool respectively, a gravel layer and a medium-coarse sand planting layer are sequentially stacked and laid at the bottom of the ecological pool, and a submerged plant vallisneria natans community is planted on the medium-coarse sand planting layer; the invention solves the problems of single function, low treatment efficiency and the like of the traditional constructed wetland, has the advantages of prominent denitrification effect, good phosphorus removal and suspended matter interception effect, strong impact load resistance, low cost, easiness in maintenance, ecological friendliness, landscape fusion and the like, also has the advantages of initial rainwater interception and the like, and is wider in application range.

The invention discloses a constructed wetland construction method for tail water lifting of an urban domestic sewage treatment plant, and particularly relates to the technical field of sewage treatment, and the constructed wetland construction method comprises the following steps: S1, landform reconstruction and diversion system construction; s2, layered construction of the composite anti-seepage structure; s3, precise configuration of gradient plants; s4, constructing an anti-impact hydraulic system; s5, establishing an ecological cooperation system; and S6, implementing a dynamic operation and maintenance mechanism. Uniform distribution of water flow is achieved through optimization of a flow guide structure, long-acting anti-seepage is guaranteed through a composite anti-seepage layer, gradient plant communities construct a three-dimensional purification network, the pollutant removal efficiency is remarkably improved, an anti-impact system is integrated with an intelligent regulation and control module, water quantity fluctuation of 30% or above can be rapidly responded, and the water quality is improved. The three-level ecological cooperation system realizes pollution interception-deep purification-ecological restoration whole process control, and the intelligent operation and maintenance system improves the management precision by three times and reduces the operation cost by more than 40% through a real-time monitoring and prediction model.

An ecological combined constructed wetland system for rare earth mine tail water treatment is characterized in that a downward vertical flow wetland and an upward vertical flow wetland of a three-stage combined wetland system are communicated through a bottom communicating pipe, and the upward vertical flow wetland and a floating island wetland are communicated through an upper overflow weir; the tail water treated by the sewage adjusting tank sequentially flows through the downward vertical flow wetland, the upward vertical flow wetland and the floating island wetland; each of the downward vertical flow wetland and the upward vertical flow wetland comprises a filler layer with a three-layer structure, and the upper layer is a plant substrate layer and is composed of fine sand or sandy loam; the middle layer is a functional material layer and is composed of hematite, zeolite or activated carbon; the lower layer is a supporting layer and is composed of coarse sand or gravel; and the aquatic plants of the floating island wetland adsorb pollutants in the water body through root systems, and decompose residual pollutants by utilizing the metabolism of the plants. The tail water treatment device can efficiently remove particular pollutants such as ammonia nitrogen, nitrate nitrogen, heavy metals and rare earth elements in the tail water of the rare earth mine.

The invention discloses a carbon source and sink accounting method based on flux observation, an ecological system carbon reserve accounting system and a flux observation carbon source and sink accounting system are established, and the ecological system carbon reserve accounting system obtains carbon reserves of plants, soil, water and ground mud based on a sample point investigation method to estimate the carbon reserves of the ecological system. Estimating regional carbon reserves in combination with remote sensing survey; the flux observation carbon source sink accounting system is based on the constructed wetland carbon sink monitoring system and monitors data in real time; regional ecological system carbon reserve dynamic accounting is carried out by combining sample plot investigation with a carbon sink model and a remote sensing image technology, compared with the prior art, long-term fixed observation sample plots are set from multiple angles of lake wetland water, soil and gas generation, and Hongze lake wetland carbon sink observation data acquisition is carried out; and carrying out parameter adjustment and correction by utilizing a modern technical means and a large model technology, carrying out Hongze lake carbon sink model construction, and realizing Hongze lake carbon sink value accounting.

The utility model relates to an aeration backwashing device for reducing blockage of a percolation tank of a constructed wetland. The device comprises a pore plate, a first backwash main pipe, a first backwash branch pipe, a second backwash main pipe and a second backwash branch pipe, a percolation tank is separated by the pore plate, the upper layer is a percolation layer, the lower layer is a drainage layer, the first backwash main pipe is mounted below an aeration main pipe, and the second backwash main pipe is mounted below the aeration main pipe. First backwash branch pipes corresponding to the aeration branch pipes are uniformly arranged on the first backwash main pipe, exhaust holes are uniformly formed in the first backwash branch pipes, and the first backwash main pipe is connected with air supply equipment through a second air supply pipe; the second backwash main pipe is mounted at the drainage layer, second backwash branch pipes are uniformly arranged on the second backwash main pipe, drainage holes are uniformly formed in the second backwash branch pipes, and the second backwash main pipe is connected with water supply equipment through a water supply pipe. According to the scheme provided by the invention, the percolation layer can be backwashed in a water-gas combination manner, and the blockage clearing effect on the percolation layer is ensured.

The invention provides a domestic sewage coupling treatment system and method based on artificial intelligence control, and relates to the technical field of sewage treatment.The domestic sewage coupling treatment system comprises a compact annular treatment unit module, an MFC-artificial wetland cooperation module, an LSTM-MPC hybrid control module and a hybrid energy supply module; constructing a sensor acquisition network, and acquiring corresponding data in real time; according to the data and based on an LSTM model, constructing a domestic sewage prediction treatment model, further outputting a predicted key water quality parameter set, and updating parameters of the domestic sewage prediction treatment model; according to the predicted key water quality parameter set, an optimization objective function is constructed, a corresponding control instruction after optimization is obtained, and optimization control over corresponding equipment is achieved; a full-dimension fault model is constructed, and a full-dimension fault analysis result is obtained according to the full-dimension fault model, so that a worker can make a maintenance preparation; and formulating an energy scheduling strategy, and realizing intelligent power supply of the system according to the energy scheduling strategy.

The utility model belongs to the technical field of organic pollutant removal, and provides a device for removing organophosphate in sewage by an iron-containing substrate reinforced artificial wetland, the iron-containing substrate comprises four layers, namely a gravel layer, a zeolite layer, a zeolite buffer layer and a quartz sand layer from bottom to top in sequence; and the zeolite layer is doped with an iron matrix. According to the device for removing the organophosphorus ester in the sewage by the iron-containing substrate reinforced artificial wetland, the reinforced removal of organophosphorus ester pollutants can be realized, the pollutant removal capability of an artificial wetland system is further effectively improved, and the ecological risk level of OPEs to a receiving water body is relieved; the device for removing the organophosphorus ester in the sewage by the iron-containing substrate reinforced constructed wetland is relatively simple in structure and convenient to construct, and has no other special requirements on the device in the process of removing the organophosphorus ester in the sewage, so that the operation cost can be effectively reduced.

The utility model relates to the technical field of sewage treatment, and particularly discloses an anti-blocking aeration backwashing device, a cleaning system and an artificial wetland substrate backwashing system, which adopt airflow backwashing to replace water flow washing, and utilize the characteristic that bubbles naturally float in water to take away obstructions in gaps of a substrate layer, so as to achieve the purpose of preventing blockage. Meanwhile, each layer of the matrix is also protected from being dispersed and mixed; blockage in the aeration device is prevented through a gravity self-sealing air guide structure, and long-term maintenance is facilitated; each filter layer of the constructed wetland is cleaned through the aeration devices which are distributed in an array manner, so that the cleaning efficiency is high, and the substrate layer of the constructed wetland system is effectively prevented from being blocked; an aeration system and a backwashing system are combined into a whole, and backwashing is carried out while aeration is carried out, so that the construction cost and the operation cost are saved, and the system is suitable for popularization and promotion.

The present application relates to the technical field of leakage detection, in particular to a method and system for detecting leakage of an anti-seepage layer in the construction of an artificial wetland, which determines the seepage time period in which each electrode grid may produce seepage by analyzing the changes in the potential difference data and humidity data of the electrode grid below the anti-seepage layer; based on the seepage time period, analyzes the coincidence of liquid diffusion between different electrode grids, and divides the electrode grid into several diffusion regions; divides the diffusion regions into suspected damage regions and diffusion interaction regions, and analyzes the area relationship between the suspected damage regions and the diffusion interaction regions to obtain the seepage damage probability of the diffusion region corresponding to each electrode grid; and according to the seepage damage probability, marks the leakage point region. Through the present application, the region where the anti-seepage layer may be damaged and diffused can be more accurately positioned, the accuracy of identifying the specific position of the anti-seepage layer where leakage occurs is improved, and the credibility of the leakage detection result of the anti-seepage layer is further improved.

The present invention proposes a water treatment system that couples anoxic biofilters with artificial wetlands, belonging to the field of water treatment technology. The key technical points are: sewage is collected through a pipe network and flows into a water collection pool, and then enters a regulating / anoxic pool through a lift pump. The solid carbon source in the pool provides a carrier for microorganisms while achieving slow-release supplementation of the carbon source, thereby strengthening the denitrification reaction to remove total nitrogen. The system is then transported to a biofilter and a contact oxidation pool by a lift pump, and COD and ammonia nitrogen are removed through carbon oxidation and nitrification reactions. The effluent enters a high-efficiency clarifier, and after most of the total phosphorus and SS are removed through chemical phosphorus removal and coagulation and sedimentation, the overflow enters an artificial wetland, and is subjected to a comprehensive treatment of plant-microorganism-filler to deeply purify the pollutants and meet the discharge standards. Using the water treatment method of the present application, the effluent water quality can be improved to the Class B emission standard.

The invention relates to the technical field of environmental engineering, in particular to a filler-replaceable artificial ecological wetland system and a construction method, and the filler-replaceable artificial ecological wetland system comprises modular filler units, a filler replacement track system, a water level control system, a biological membrane protection system, a monitoring feedback system and an intelligent control system. According to the artificial ecological wetland system capable of replacing the filler and the construction method, the modular filler units are filled with volcanic rock and activated carbon composite functional filler, and rapid replacement is achieved through the track system; the monitoring feedback system collects data such as permeability coefficient and pollutant concentration in real time, the intelligent control system generates a replacement instruction based on a machine learning algorithm, and the biological membrane protection system is combined to ensure the microbial activity in the replacement process, so that the problems of difficult replacement and fast treatment efficiency attenuation of traditional wetland filler are solved; the method is suitable for the scenes of urban sewage advanced treatment, rural non-point source pollution treatment and the like, and provides technical support for efficient and stable operation of the constructed wetland.

This invention relates to an optimized control method for the enrichment of anaerobic ammonia-oxidizing bacteria based on niche regulation, comprising: S1, selecting key niche indicators of constructed wetlands as investigation factors, differentially setting the investigation factors to form experimental systems with different niches, conducting constructed wetland control and monitoring, and collecting data; S2, using the relative abundance and / or absolute abundance of anaerobic ammonia-oxidizing bacteria collected in S1 as dependent variables and the key niche indicators as independent variables, fitting and then predicting a model; S3, making predictions using the prediction model, comparing the prediction results with the control target, and optimizing the control of anaerobic ammonia-oxidizing bacteria enrichment in constructed wetlands based on the comparison results. This method can obtain a prediction model with high prediction accuracy, and then, by adjusting the niche indicators in constructed wetlands, the enrichment of anaerobic ammonia-oxidizing bacteria can be ensured, wastewater treatment efficiency can be improved, and a better total nitrogen removal effect can be achieved.

The utility model discloses a compound circulating type constructed wetland tail water treatment system, and belongs to the technical field of water treatment systems. The system comprises a vertical subsurface flow wetland, a horizontal subsurface flow wetland and a surface flow wetland which are sequentially connected in series, tail water firstly passes through a water distribution unit of the vertical subsurface flow wetland, passes through a first multi-layer filler from bottom to top, and then passes through a second multi-layer filler from bottom to top; according to the utility model, the three wetland systems are combined, and are strengthened in the circulating plug-flow type surface flow wetland, the function division is reasonable, the operation is simple, the operation is convenient, the cost is low, the operation is convenient, the operation is simple, the operation is convenient, the operation is convenient, the operation is convenient, and the cost is low. The tail water firstly enters the vertical subsurface flow wetland and the horizontal subsurface flow wetland to intensively remove various types of pollutants such as organic matters, nitrogen and phosphorus, and subsequently enters the surface flow wetland, and the submerged plants at the water bottom and the emergent aquatic plants on the water surface act together to intensify the purified water quality and improve the purification effect of the tail water.

The invention provides a method and a system for regulating and controlling nitrogen circulation of a constructed wetland by using root exudates, and relates to the technical field of constructed wetland sewage treatment. The method comprises the following steps: 1) constructing a plant root exudate database; 2) training a machine learning prediction model and optimizing parameters by adopting a machine learning algorithm and using the data of the plant root exudate database; 3) screening the compounds in the natural product database by using the machine learning prediction model in the step 2), predicting the denitrification potential of the compounds, and selecting candidate substances; and 4) constructing a microcosm culture system, in the microcosm culture system, detecting nitrogen removal and microbial response by adding the candidate substances obtained in the step 3) with different concentration gradients, and verifying the denitrification effect of the candidate substances. The system disclosed by the invention is high in datamation degree, simple and convenient to operate, accurate in prediction and low in cost, provides a new technical means for enhanced denitrification of the constructed wetland, and has a good industrial application prospect.

This invention relates to a high-efficiency nitrogen and phosphorus removal composite constructed wetland system based on short-cut nitrification-anaerobic ammonium oxidation (ATAO) co-embedded particles. The system comprises a surface flow constructed wetland, a vertical subsurface flow constructed wetland, an aeration pond, and a horizontal subsurface flow constructed wetland arranged sequentially along the water flow direction. The horizontal subsurface flow constructed wetland includes a soil layer and a layer of short-cut nitrification-anaerobic ammonium oxidation co-embedded particle filler. The main body of the composite constructed wetland system is submerged in the river channel, forming a closed corridor container through the constructed wetlands and the ecological pond frame, making full use of previously unusable space and achieving space saving. Compared with existing technologies, this invention overcomes the shortcomings of existing constructed wetlands, such as large land area, low nitrogen and phosphorus removal efficiency, and significant susceptibility to natural environmental influences. It has stronger processing capacity and better adaptability, achieving low-carbon, energy-saving, green, and highly efficient nitrogen and phosphorus removal.

The invention relates to the technical field of sewage treatment, in particular to a resource recycling method for rural domestic sewage. On the basis of the rural domestic sewage, after the rural domestic sewage is subjected to anaerobic-aerobic treatment, on one hand, the concentration of organic matters and the content of nitrogen and phosphorus in the domestic sewage are effectively reduced, on the other hand, the aerobic effluent is not specially treated, and the aerobic effluent still contains sufficient nitrogen and can be directly used for irrigation after being precipitated; meanwhile, sludge obtained by the sedimentation tank contains rich phosphorus, phosphorus in the sludge can be effectively extracted through carbonization and acid leaching of the sludge and can be used for supplementing phosphorus for crops, meanwhile, when effluent of the sedimentation tank needs to be discharged, the constructed wetland is adopted for further treatment, and sludge carbonized slag is made into filler to be used in the constructed wetland, so that the sludge can be recycled. The device has a good water quality purification effect, realizes treatment and recycling of water resources, and is of great significance to environmental protection and resource saving.

The utility model provides a kind of artificial wetland of urban sewage treatment, including preliminary filter box and wetland body, the left side of preliminary filter box is connected with inlet pipe, the right side of wetland body is located preliminary filter box, the right side of preliminary filter box is connected with drain pipe, the middle end of drain pipe is fixedly installed with water pump, the end of drain pipe away from preliminary filter box is connected into the inner chamber of wetland body, the outside of preliminary filter box is fixedly installed with fixed frame, the surface of preliminary filter box is provided with cleaning mechanism, the cleaning mechanism includes motor, driven gear, support frame and frame, by setting cleaning mechanism, it can effectively avoid after carrying out preliminary filtration to sewage, due to the influence of garbage, leading to sewage cannot normally flow into the situation occurs in the inner chamber of wetland body, while reducing the step of manually fishing garbage in the inner chamber of preliminary filter box, reduce the waste of artificial cost.

The invention discloses a lake-entering estuary wetland system. The sewage treatment device sequentially comprises a water inlet unit, a speed reduction and siltation promotion area, a deep turbidity reduction area, an enhanced purification area, a water quality stabilization area and a water outlet unit in the water flow direction, the lake-entering estuary wetland system is separated from the lake through an embankment; the water inlet unit comprises a wetland water inlet gate and a flood discharge gate. Aiming at the special hydrology and water quality conditions of the estuary entering the lake, the invention solves the problems of low plant survival rate, easy system blockage, unstable purification efficiency and the like in the existing constructed wetland system.

The utility model relates to an enhanced denitrification device for a microbial electrolysis constructed wetland. The enhanced denitrification device comprises a constructed wetland system, an electrolysis system and an intelligent control system, the constructed wetland system comprises a water distribution area and a constructed wetland reaction area; a water inlet device is arranged in the water distribution area, and the water distribution area is communicated with the constructed wetland reaction area through the water inlet device; wherein an electrolysis system and an intelligent control system are also arranged in the constructed wetland reaction zone. The device has the advantages that the removal of pollutants, mainly nitrogen, of the constructed wetland is enhanced by mainly utilizing external voltage in the electrolysis system 2, and the water inlet flow, the external voltage and the distance between the electrodes can be adjusted according to the intelligent control system 3, so that the surface hydraulic load of the constructed wetland and the current intensity in the wetland are controlled; and the two systems cooperate to enhance the removal of pollutants, especially nitrogen, of the constructed wetland, so that the pollutants in water are efficiently removed, the water quality of discharged wastewater is improved, and the environmental water quality is improved.

The application discloses a magnetic LDH biochar as well as a preparation method and application thereof, and belongs to the technical field of pollution prevention and control. The preparation method of the magnetic LDH biochar comprises the following steps: sequentially performing puffing treatment and pyrolysis carbonization treatment on iron-containing biomass to obtain magnetic biochar; mixing a magnesium salt solution and the magnetic biochar, and then performing hydrothermal reaction to obtain magnetic loaded iron-magnesium hydrotalcite biochar; mixing the magnetic loaded iron-magnesium hydrotalcite biochar and a nitrogen source, and then heating and doping to obtain the magnetic LDH biochar. The magnetic LDH biochar prepared by the application can adsorb dissolved oxygen around the carbon material, improve the mass transfer efficiency and dissolved oxygen utilization rate of microbial degradation of pollutants in the artificial wetland, rapidly enrich oxygen, increase the dissolved oxygen concentration of the water body, has the advantages of low energy consumption, difficulty in blocking, high nitrogen and phosphorus removal efficiency and the like, and when the magnetic LDH biochar is applied to the intermittent aeration artificial wetland, the nitrogen and phosphorus treatment performance of the artificial wetland can be effectively strengthened.

The present invention discloses a bio-battery coupled artificial wetland, which relates to the technical field of artificial wetlands and includes a lower filler area arranged above a water distribution pipe; an upper filler area arranged on the upper side of the lower filler area; and a biofilm frame arranged on the upper side of the upper filler area. The bio-battery coupled artificial wetland of the present invention has a simple structure and a good water treatment effect. The present invention discloses a water treatment method of a bio-battery coupled artificial wetland, which firstly treats and acclimates the sludge through a filtering and cleaning device, and then adds the sludge near the rare earth-reinforced biofilm electrode of the upper filler, and introduces sewage to operate the artificial wetland to treat the water. The present invention enhances the denitrification performance of the artificial wetland by coupling the bio-battery to the artificial wetland, mainly enhancing the nitrate nitrogen reduction effect.

The present application relates to the technical field of sewage treatment, in particular to a method for recycling and utilizing rural domestic sewage. Based on rural domestic sewage, the method effectively reduces the concentration of organic matter and the content of nitrogen and phosphorus in the domestic sewage after anaerobic-aerobic treatment. The aerobic effluent still contains sufficient nitrogen, which can be directly used for irrigation after precipitation. The sludge obtained from the sedimentation tank contains rich phosphorus, which can be extracted by carbonization and acid leaching of the sludge, and used for supplementing phosphorus for crops. When the effluent from the sedimentation tank needs to be discharged, it is further treated by artificial wetland, and the carbonization residue of the sludge is made into filler for the artificial wetland, which has good water purification effect, realizes the treatment and recycling of water resources, and has important significance for environmental protection and resource conservation.

The application relates to a horizontal subsurface flow constructed wetland system capable of adding agricultural biomass carbon sources, and belongs to the technical field of environmental protection and water treatment technology. The system comprises a water inlet collecting area, a carbon source adding unit arranged in the water inlet collecting area, a ceramsite type wetland unit connected with the water inlet collecting area, a brick slag type wetland unit connected with the ceramsite type wetland unit, a zeolite type wetland unit connected with the brick slag type wetland unit, an oyster shell type wetland unit connected with the zeolite type wetland unit, and a water outlet collecting area connected with the oyster shell type wetland unit. Plants are planted on the ceramsite type wetland unit, the brick slag type wetland unit, the zeolite type wetland unit and the oyster shell type wetland unit. Agricultural wastes are arranged in the carbon source adding unit. Water in the water inlet collecting area enters the ceramsite type wetland unit through the carbon source adding unit and a water passing assembly. The application has the effects of maintaining sufficient carbon sources in the wetland system, applying agricultural wastes to the water treatment wetland system, and improving the utilization rate of the agricultural wastes.