90 results about "Sequencing batch reactor" patented technology

The invention provides a method for inhibiting sludge bulking through hypoxia-anoxic intermittent aeration. The method comprises the following steps: inoculating activated sludge into a sequencing batch reactor, introducing sewage to be treated, mixing, and carrying out intermittent aeration treatment; wherein the intermittent aeration treatment comprises at least one cycle formed by alternation of a low-oxygen treatment time period and an anoxic treatment time period; and in the low-oxygen treatment period, the dissolved oxygen concentration in the reactor is controlled to be higher than that in the anoxic treatment period through aeration. According to the method, through low-oxygen-oxygen-deficiency alternate environment regulation and control, efficient nitrification and denitrification are achieved, meanwhile, filamentous bacterium growth is selectively inhibited, flora structure optimization is promoted, the sludge settling performance is rapidly recovered, the system denitrification efficiency is improved, and the method has the advantages of being simple in process, environmentally friendly and low in operation cost.

The invention discloses a sequencing batch sewage treatment device and method. The sequencing batch sewage treatment device comprises a reaction tank body; aeration units of the microporous aeration assembly are distributed in the bottom area of the reaction tank body in an array manner; the rotating axis of the stirring assembly coincides with the geometric center of the reaction tank body; and the time sequence cooperative controller is connected with the microporous aeration assembly through a first signal link, is connected with the stirring assembly through a second signal link, and is configured to control the microporous aeration assembly and the stirring assembly to be alternately started and stopped in a single treatment period, and maintain the duration ratio of the aeration stage to the stirring stage to be within an adjustable range. According to the scheme, the timing sequence cooperative controller is connected with the aeration and stirring assembly, the aeration and stirring assembly are controlled to be alternately started and stopped in a single treatment period, the aeration / stirring duration proportion is dynamically adjusted, and the precise micro-aerobic environment is constructed.

The invention discloses a carrier type anaerobic sequencing batch reactor suitable for anaerobic digestion treatment of sludge and a treatment method. The anaerobic sequencing batch reactor comprises a tank body, a stirrer, a biogas water-sealed tank, a temperature adjusting module, a bottom sludge inlet valve, a scum valve, an overflow sludge discharge valve, a bottom sludge discharge valve, a circulating sludge path and carrier adding equipment, the carrier recovery device comprises a magnetic adsorption recovery device, the output end of the overflow sludge discharge valve and the output end of the bottom mud discharge valve are connected with the input end of the magnetic adsorption recovery device, the reactor can enrich microorganisms by adding the magnetic carrier, the settleability of the sludge can be improved by formed anaerobic granular sludge, and the magnetic carrier can be recycled. The device is simple in structure, realizes shorter sludge hydraulic retention time and longer sludge retention time, and is matched with carrier recovery equipment to recover carriers in discharged sludge and enable the carriers to flow back to the reactor, so that loss of the carriers is avoided.

The application discloses a method for simultaneously strengthening phosphorus removal and nitrogen removal by using an anaerobic-aerobic granular sludge reactor, and specifically comprises the following steps: adopting an anaerobic-aerobic operation mode to form aerobic granular sludge with biological phosphorus removal capacity in a sequencing batch reactor; sequentially performing an anaerobic water feeding stage, an aerobic stage, a sedimentation stage and a water discharge stage in each operation cycle; wherein the multi-point layered water feeding mode is adopted in the anaerobic water feeding stage; the wastewater to be treated is fed from the bottom and the middle of the granular sludge layer, wherein the water feeding amount at the bottom of the granular sludge layer accounts for 70-90% of the total water feeding amount; the intermittent aeration mode is adopted in the aerobic stage, each intermittent aeration cycle comprises an aeration period and a non-aeration period, and the time ratio of the single aeration period to the single non-aeration period is 2-3:1. By operation regulation, a microenvironment conducive to denitrification and phosphorus precipitation is constructed inside the aerobic granular sludge, carbon source competition can be effectively alleviated, phosphorus removal pathways are expanded, and the synergistic strengthening of the nitrogen removal and phosphorus removal processes is promoted.

A method and apparatus for treating wastewater using a sequencing batch reactor wherein the biological solids are densified through hydraulic and organic selection pressures. Wastewater is introduced to the reactor near the end of the treatment cycle under anaerobic conditions following the effluent withdrawal step and prior to the start of next treatment cycle. A floating sludge withdrawal apparatus is used in conjunction with a floating surface mixer to selectively remove lighter flocculant solids and retain denser solids by temporarily reducing the mixing energy during the wasting process.

The invention discloses a deep denitrification system and method for driving Coammox and Anammox synergism by utilizing micro-current Fe-Cu bipolar biological electrode particles, and belongs to the technical field of biological sewage treatment and microorganism enrichment. The system comprises an SBR (Sequencing Batch Reactor) added with Fe-Cu bipolar biological electrode particles, an aeration and control system and a DO / ORP (Dissolved Oxygen / Oxidation Reduction Potential) online monitoring device. Under the condition of ultralow dissolved oxygen, through microampere-level current and by utilizing the ecological niche advantages of in-situ slow release of Fe and Cu trace elements and active reinforcement of Comammox and Anammox of a bipolar electrode and electron directional flow in a nitrogen metabolism process, metabolic synergy and spatial copolymerization of Comammox and Anammox are driven, so that high enrichment and efficient deep denitrification of Comammox and Anammox are realized under the mainstream ammonia nitrogen concentration (40mg-N / L). The system does not need an organic carbon source, is simple in process and stable in operation, can remarkably reduce aeration energy consumption and material consumption, is suitable for low-carbon deep denitrification and upgrading and reconstruction of municipal sewage treatment, and provides a new insight for global biological nitrogen circulation.

The invention discloses a starting and control method for treating ammonia-nitrogen wastewater by an integrated complete ammoxidation coupling short-cut denitrification anaerobic ammoxidation process, and belongs to the field of wastewater biological treatment. The starting method adopts a step-by-step inoculation strategy, and comprises the following steps: firstly, inoculating complete ammoxidation sludge in the SBR reactor for low-oxygen domestication, and after successful starting, supplementing and inoculating short-cut denitrification coupled anaerobic ammoxidation sludge. The control method adopts a sectional water inlet mode, and comprises the following steps: a first part of ammonia nitrogen wastewater firstly enters an integrated SBR (Sequencing Batch Reactor), and ammonia nitrogen is directly oxidized into nitrate nitrogen through complete ammonia oxidizing bacteria (Comammox) under the condition of low dissolved oxygen; aeration is stopped, a carbon source is added for short-cut denitrification, and nitrate nitrogen is reduced into nitrite nitrogen; and then pumping a second part of ammonia nitrogen wastewater, and converting ammonia nitrogen in the wastewater and accumulated nitrite nitrogen into nitrogen by using anaerobic ammonium oxidation bacteria, so as to remove the ammonia nitrogen in the wastewater. According to the invention, deep denitrification is realized under the condition of saving energy consumption and a carbon source.

The invention discloses a process for producing titanium-zirconium-hafnium series metal through continuous reduction, which comprises the following steps: in an inert atmosphere, heating a reactor to a reaction temperature, adding metal magnesium, and then continuously adding tetrachloride at a constant high speed to carry out reduction reaction. In the reaction process, magnesium chloride melt is continuously or intermittently discharged, and metal magnesium is supplemented to maintain the reaction; meanwhile, the generated sponge titanium is continuously moved out and conveyed to a collector through a conveying device directly communicated with the reactor. The whole process of feeding, reacting, discharging and product moving-out is continuous, a traditional sequencing batch production mode is subverted, the titanium tetrachloride feeding speed can be stably kept at a high level (for example, the titanium tetrachloride feeding speed is larger than or equal to 1600 kg / h), the production efficiency is remarkably improved compared with a traditional process, meanwhile, stability and excellent product quality are guaranteed, the automation degree is high, and the production cost is low. And centralized recycling of reaction waste heat can be realized.

The invention provides a method for treating comprehensive wastewater by combining potassium ferrate with oxidation, and belongs to the field of industrial wastewater treatment. The method comprises three stages of wastewater pretreatment and treatment system starting, catalytic oxidation, solid-liquid separation and material regeneration, a Fe3O4 (at) MIP-Azo (at) K2FeO4: Azo-SO3 nanosheet material is combined with potassium hydrogen peroxymonosulfate, a sequencing batch reactor is used for catalytic oxidation treatment of comprehensive wastewater, and the Fe3O4 (at) MIP-Azo (at) K2FeO4: Azo-SO3 nanosheet is recycled after being separated and regenerated. According to the invention, the balance of selective adsorption and broad-spectrum oxidation is realized, the Fe3O4 (at) MIP-Azo (at) K2FeO4: Azo-SO3 nanosheets are used for targeted enrichment of specific pollutants, potassium hydrogen peroxymonosulfate and K2FeO4 are used for full-spectrum oxidation, full-chain treatment of comprehensive wastewater is realized, and the method is especially suitable for deep purification of industrial wastewater with complex components and high toxicity.

This invention provides a sequential batch process for treating nitrogen and phosphorus in wastewater. The method includes the following steps: (1) introducing wastewater into an electrochemical reaction device while adding sulfur-containing materials; (2) subjecting the wastewater to an electrochemical reaction under the action of a DC power supply, followed by sequential stirring and aeration; (3) repeating step (2) in a cycle, allowing the wastewater to settle before discharge. This invention achieves immediate start-up, extreme nitrogen and phosphorus removal, and rapid proliferation of sulfur-autotrophic bacteria in the wastewater treatment process by combining intermittent DC power supply with intermittent microaerobic aeration. Furthermore, it eliminates the need to adjust the pH during the wastewater treatment process and improves the service life of the anode.

The invention provides a sewage treatment method beneficial to sludge reduction, and relates to the field of sewage treatment. The sewage treatment method comprises the following steps: adding graphene subjected to surface hydrophilization modification into an activated sludge system, and intensifying the formation of granular sludge through anaerobic-aerobic alternate operation and hydraulic separation in a sequencing batch reactor. The Raman spectrum ID / IG ratio of the modified graphene is less than or equal to 0.2. According to the present invention, the modified graphene provides the microorganism attachment carrier and the electron transfer channel, and the dynamic precipitation control strategy is combined to achieve the rapid formation of the granular sludge, the improvement of the system treatment efficiency and the significant reduction of the excess sludge, such that the method is suitable for the low-carbon and high-efficiency municipal and industrial sewage treatment.

This invention relates to a device and method for rapidly starting a short-cut nitrification process, belonging to the field of water treatment. The invention involves inoculating a secondary sedimentation tank with sludge and adding a polyurethane biological sponge carrier into a sequencing batch reactor (SBR). First, a phased influent influent + incremental post-aeration strategy (increasing aeration time first, then increasing aeration rate) is adopted. This utilizes nitrate and a dynamic oxygen environment to drive the migration of *Candidatus Contendobacter* to the sponge carrier and complete its enrichment and acclimatization, reducing the obstruction of O2 on the endogenous denitrification process of *Candidatus Contendobacter* under aerobic conditions. The phased influent influent is then eliminated, and NH4 is introduced. + -N synthesis wastewater is treated using a low-alkalinity strategy (reducing influent KHCO3 concentration) + post-aeration with an initial increase followed by a decrease in aeration volume, combined with strong NO2 stimulation from Candidatus Contendobacter in a low dissolved oxygen environment. ‑ -N reducing power inhibits NOB growth, enabling rapid start-up of the short-cut nitration process.

The invention relates to an anaerobic ammonia oxidation coupled anaerobic digestion system with biological denitrification cooperating with biogas purification and a use method thereof. The system comprises an anaerobic digestion tank, a carbon dioxide absorption device and a PN / A unit, the PN / A unit comprises an anaerobic ammonia oxidation reactor and a sequencing batch reactor; the anaerobic digestion tank is used for providing an anaerobic digestion environment for organic solid waste or organic wastewater, a biogas outlet of the anaerobic digestion tank is connected with the carbon dioxide absorption device, and a digestion liquid outlet of the anaerobic digestion tank is connected with a water inlet of the sequencing batch reactor; the carbon dioxide absorption device is used for absorbing carbon dioxide in gas discharged from the biogas outlet through water so as to purify the biogas; the water outlet of the sequencing batch reactor is connected with the water inlet of the anaerobic ammonia oxidation reactor, the water outlet of the anaerobic ammonia oxidation reactor is connected with the carbon dioxide absorption device, and the liquid outlet of the carbon dioxide absorption device is connected with the water inlet of the anaerobic ammonia oxidation reactor to form a liquid circulation loop. According to the invention, integration of biogas purification, denitrification, sulfur removal and pH self-regulation is realized.

The application discloses a method for strengthening double short-cut anaerobic ammonia oxidation of municipal sewage by means of intermittent aeration and segmented water feeding, and belongs to the field of sewage biological treatment. The double short-cut anaerobic ammonia oxidation is a biological denitrification process dominated by short-cut nitrification, short-cut denitrification and anaerobic ammonia oxidation reaction. The method is characterized in that the double short-cut anaerobic ammonia oxidation process is operated by means of intermittent aeration AOAOAOA, is used for maintaining stable operation of the short-cut nitrification, and provides a stable substrate source for the anaerobic ammonia oxidation bacteria; segmented water feeding is used, 4 / 5 of raw water is pumped into the SBR (Sequencing Batch Reactor) reactor, internal carbon sources are stored under anaerobic conditions, and the remaining 1 / 5 of raw water is pumped into the second aerobic end of the intermittent aeration, so that the COD in the raw water is directly used by the denitrifying bacteria. The method solves the problems of unstable short-cut nitrification, high demand for carbon sources of the short-cut denitrification, long time consumption of the internal source denitrification and the like in the double short-cut anaerobic ammonia oxidation process.

The utility model discloses an SBR (Sequencing Batch Reactor) reaction tank, which relates to the technical field of sewage treatment and comprises a reaction tank main body, a circulating pipe arranged on the reaction tank main body, a water outlet pipe arranged at the edge of one side of the reaction tank main body, a water inlet pipe arranged at the edge of the other side of the reaction tank main body, an aerator pipe arranged at the bottom of the reaction tank main body and an inner partition wall plate arranged in the reaction tank main body, a stirring mechanism is arranged on the reaction tank main body and comprises a mechanism shell arranged above the reaction tank main body, a stirring shaft is movably mounted at the bottom of the mechanism shell, stirring blades are fixedly mounted at the lower end of the stirring shaft, a transmission shaft is movably mounted in the mechanism shell, and a driving motor is fixedly mounted at one end of the mechanism shell; a lifting mechanism is arranged at the bottom of the mechanism shell. And the SBR reaction tank. And through cooperative use of the stirring mechanism and the lifting mechanism, the stirring blades can be separated from sewage when stirring is stopped, the risk that the stirring blades are corroded is reduced, and the service life of the stirring blades is prolonged.

The utility model relates to the technical field of sewage treatment devices, in particular to an SBR (Sequencing Batch Reactor) aeration device which comprises a central rod, the lower end of the central rod is connected with a chassis seat through a butt joint mechanism, the outer side of the central rod is symmetrically and rotationally sleeved with a rotating shell, and a gas dispersion cavity and a water dispersion cavity are arranged between the central rod and the rotating shell; a connecting mechanism is arranged on the side wall of the center rod and arranged in the rotating shell through a mounting mechanism, and a sweeping mechanism is arranged on the side wall of the rotating shell. Through the rotating shell and the drain pipe, the exhaust pipe and the brush which are distributed in the circumferential direction, gas and water are horizontally sprayed to form power for driving the rotating shell to rotate, so that the brush is driven to synchronously rotate for sweeping, and through the gas dispersing cavity and the water dispersing cavity, respective supply and flow control of the water and the gas are conveniently achieved; the drainage pipe, the exhaust pipe and the brush are all of a detachable splicing structure, so that the spraying coverage area of water and gas and the cleaning area of the brush are changed.

The invention relates to the technical field of biological sewage treatment, and discloses a high-efficiency denitrification method based on an anaerobic ammonia oxidation process, the method is operated based on a sequencing batch reactor, and the method comprises a composite conductive matrix construction step and a time sequence pulse maintenance operation step, the method comprises the following steps: firstly, adding ferroferric oxide and ferrous sulfide powder into a sludge mixed solution to construct a composite magnetic biological carrier; in the water inlet stage, local acid microenvironment construction, protective pulse activation and mainstream water inlet and in-situ reconstruction operation are sequentially executed. By controlling the pH value and the dosing sequence, the acidic environment is utilized to trigger ferrous sulfide to release reducing components so as to protect the hydroxylamine metabolism activator from being oxidized, and then the pH value is adjusted back by utilizing mainstream inlet water to induce dissolved ions to generate in-situ flocculation. According to the method, the utilization rate of the activating agent is effectively increased, the problems of carrier surface passivation and sludge loss are solved, and the denitrification efficiency and the operation stability of the system are remarkably enhanced.

This invention discloses a method for treating dyeing and printing wastewater based on an nZVI / AGS coupling process, comprising the following steps: wastewater pre-activation and interface optimization, wherein the dyeing and printing wastewater is introduced into a pre-activation tank; nZVI gradient functionalization modification: nZVI is treated using a "core-shell" approach, with nZVI as the core, and conductive polymer polypyrrole and biochar nanosheets are sequentially coated on it; AGS gradient structure directional cultivation: AGS is cultivated using a "dual substrate-magnetic field induced" cultivation method, wherein sodium acetate and glucose are selected as composite carbon sources in a sequencing batch reactor, with a mass ratio of 3:1, and the C:N:P ratio is controlled at 100:5:1, and magnetic nano-iron oxide particles at a concentration of 20-30 mg / L are added; gradient coupling synergistic degradation: the modified nZVI and the optimized cultured AGS are fed into a three-stage gradient coupling reactor, and the wastewater treated by gradient coupling synergistic degradation enters a photocatalysis-membrane filtration coupling unit for further treatment.

The invention discloses a deep nitrogen and phosphorus removal method for directionally regulating and controlling phosphorus-accumulating bacteria and glycogen-accumulating bacteria in allusion to low-concentration municipal sewage. In a sequencing batch reactor, low-concentration municipal sewage is used as a matrix, and coupling of PAOs / DPAOs and GAOs / DGAOs in aerobic granular sludge is fully utilized to realize deep nitrogen and phosphorus removal of wastewater. In the starting stage, sludge is regularly discharged through an A / O operation mode to rapidly enrich PAOs; in the operation stage, through an A / O / A mode, sludge age control and dissolved oxygen concentration regulation, DGAOs enrichment is realized, conditions are created for DPAOs appearance, NOB is inhibited, and short-cut nitrification endogenous denitrification is promoted. According to the method, the abundance balance of PAOs / DPAOs and GAOs / DGAOs is achieved by adopting a periodic carbon source multiplication coupling PO4 < 3-> concentration control technology and post-anoxic section time length regulation and control in the stable period of the system, at the moment, yellow particles and white particles in the system coexist, the cultured aerobic particles are stable in structure, and synchronous carbon, nitrogen and phosphorus synergistic removal can be achieved. According to the method for directionally regulating and controlling PAOs / DPAOs and GAOs / DGAOs provided by the invention, the removal rate of COD (Chemical Oxygen Demand) in sewage can be more than 90%, and the removal rate of TN (Total Nitrogen) / TP (Total Protein) is nearly 100%.

The utility model provides a reaction device for promoting generation of compact activated sludge, which relates to the technical field of sewage treatment and comprises a main flow SBR (sequencing batch reactor) reaction structure, a side flow SBR reaction structure, a water inlet bucket, a water outlet bucket and an aeration structure. The side flow SBR reaction structure is connected with the main flow SBR reaction structure through a water conveying assembly; the main flow SBR reaction structure is used for taking out sewage from the water inlet barrel and conveying part of the taken-out sewage to the side flow SBR reaction structure; and the side flow SBR reaction structure is used for stirring the sewage through the second stirring mechanism so as to enable the sewage to be in an anoxic state, and discharging the sewage in the anoxic state to the main flow SBR reaction structure after the reaction of the main flow SBR reaction structure is finished. According to the utility model, the technical problems in the prior art that the forming speed of compact activated sludge is relatively slow and the settling performance of the compact activated sludge in the generation process is relatively poor are solved.

The application discloses a low-carbon and high-efficiency seawater breeding wastewater treatment device and method, wherein the device comprises a sequencing batch reactor and a modified hollow fiber membrane assembly arranged in the sequencing batch reactor, and is provided with a stirring, constant temperature, monitoring and aeration control unit. The method strengthens the microbial biofilm by the modified membrane assembly, adopts a salinity and antibiotic gradient domestication strategy, constructs a stable simultaneous nitrification and denitrification (SND) process under a low dissolved oxygen (DO<0.2 mg / L) condition, and realizes efficient and collaborative removal of carbon, nitrogen pollutants and antibiotics. The application significantly improves the stability of the system against salinity and antibiotic impact, reduces the aeration energy consumption, effectively solves the problem that the microbial activity is inhibited when the traditional biological process is used to treat high-salinity and antibiotic-containing seawater breeding wastewater, and provides a reliable technical scheme for low-carbon and high-efficiency treatment of seawater breeding wastewater.

The application relates to a high-nitrogen garbage leachate degradation device, which comprises two connected sequencing batch anaerobic reactors, and reactor water inlet pipes and reactor sludge inlet pipes are respectively connected to the lower parts of the anaerobic reactors, and belongs to the technical field of water treatment equipment. The device is characterized in that the upper end of the anaerobic sequencing batch reactor is provided with an electrodeionization device which is composed of five compartments, i.e. an anode chamber, a first concentrated water chamber, a fresh water chamber, a second concentrated water chamber and a cathode chamber. The fresh water chamber is communicated with the reactor and is filled with mixed cation and anion exchange resins in a ratio of 1:1. The garbage leachate enters the fresh water chamber from the lower end of the reactor. The device fully utilizes the anaerobic biological treatment method and the electrodeionization technology, is energy-saving and environment-friendly, can effectively remove ammonia nitrogen and COD in the high-nitrogen garbage leachate, does not need frequent shutdown and cleaning, can be operated for a long time, and meets the environmental protection requirements.

The invention discloses a method for regulating and controlling enrichment fermentation type phosphorus-accumulating bacteria based on anaerobic residence time. According to the method, acid hydrolysis casein simulates macromolecular organic matters in domestic sewage and / or excess sludge as a unique carbon source, and the method comprises two stages: the first stage is an enrichment stage, inoculated sludge continuously runs for more than 200 days in a sequencing batch reactor, so that the relative abundance of fermentation type phosphorus-accumulating bacteria reaches more than 14%; the fermentation type phosphorus-accumulating bacterium flora is successfully enriched; the second stage is an optimization stage, the enriched sludge is inoculated into a new sequencing batch reactor, the anaerobic residence time is adjusted to be 7 h, after more than 70 cycles of operation, the concentration of phosphate in effluent of the system is kept stable, and the relative abundance of fermentation type phosphorus-accumulating bacteria is increased to 16% or above, which indicates that the anaerobic residence time regulation and control are completed. The method is easy and convenient to operate and low in cost, the community proportion of the fermentation type phosphorus-accumulating bacteria can be remarkably increased, and therefore the utilization capacity of a biological phosphorus removal system on a complex carbon source is improved and enhanced.

The invention discloses a device and a method for rapidly enriching in-situ anaerobic iron ammonia oxidizing bacteria based on an ammonia nitrogen and ferric iron substrate concentration regulation strategy, and belongs to the technical field of biological sewage treatment. The invention aims to solve the technical problems of slow start and difficult in-situ enrichment of anaerobic iron ammonia oxidizing bacteria. The device mainly comprises a sequencing batch reactor, a wastewater storage tank and a water outlet tank. According to the method, the concentrations of ammonia nitrogen and ferric iron in inlet water are regulated and controlled by stages, and three stages of flora adaptation and starting, rapid enrichment under a low-concentration condition and internal iron circulation construction after the addition of exogenous iron is completely stopped are sequentially performed, so that the stable enrichment of the functional flora is finally realized. The whole process is operated under an anaerobic condition, aeration and additional organic carbon sources are not needed, and an efficient and controllable new technical scheme is provided for realizing low-carbon and energy-saving deep denitrification of urban sewage.

The utility model relates to the technical field of wastewater treatment devices, and discloses a comprehensive treatment system for paint spraying wastewater, which comprises the paint spraying wastewater, a paint spraying wastewater collection tank, an oil separation sedimentation tank, a dissolved air flotation machine, an SBR (sequencing batch reactor) reaction tank, a sludge tank and a plate-and-frame filter press, and gas is injected into the paint spraying wastewater collecting tank. According to the comprehensive treatment system for the paint spraying wastewater, sewage is collected through the paint spraying wastewater collecting tank, meanwhile, the sewage is settled through the oil separation settling tank, demulsification and oil removal treatment is conducted through the dissolved air flotation machine, aeration is conducted on the sewage through the SBR reaction tank, it is ensured that sewage treatment is more sufficient, and meanwhile solid-liquid separation can be conducted on the treated sewage through the filter pressing device; therefore, the paint spraying wastewater is effectively treated, the treatment investment cost is saved, and up-to-standard discharge is realized.

The invention provides a double-threshold (SI, Ca / P) closed-loop device and a double-threshold (SI, Ca / P) closed-loop method taking a hydroxyapatite (HAP) skeletonization window as a core, aiming at rapid prototyping of anammox granular sludge in a high ammonia nitrogen sewage treatment process. The device comprises an SBR (sequencing batch reactor), an online DO / pH / TDS (dissolved oxygen / pH / total dissolved solids) and Ca / P feeding and linkage controller, is matched with a coaxial double-ring microporous injection component to realize short pulse (lagging for 2-10 seconds) of'first calcium and then phosphorus', and is provided with a replaceable sacrificial nucleation cylinder to capture Ca-P microcrystals and reduce scale. The controller adjusts Ca and P pulses and SBR phase time in a linkage mode according to DO, pH, TDS and a manually-input target window (SI = 0.2-0.6, Ca / P = 1.4-1.8); when TDS / pH exceeds a limit value or an excessive mineralization symptom (for example, the HAP peak area in XRD is greater than 15%) occurs, Ca is automatically reduced, and hunger time is prolonged. OCT / FBRM can be selectively accessed, mu t / void ratio or chord length distribution is used as auxiliary triggering, and integration of structure-chemistry-operation is achieved. According to the scheme, anammox granulation is stably and efficiently achieved, an HAP nucleation-growth window is used as a main target, the volume fraction of particles with the particle size larger than or equal to 0.5 mm and larger than or equal to 80% can be obtained within 2-4 weeks, the strength and settleability are remarkably improved, and over-mineralization embrittlement is avoided.

The application discloses a river sewage treatment method and a treatment agent, and belongs to the technical field of sewage treatment. The river sewage treatment agent is obtained by fixing and compounding microbial liquid with modified polyurethane foam as a carrier, wherein the modified polyurethane foam comprises a magnetic hydrophilic polyurethane foaming framework and a polyethylene imine crosslinking layer loaded on the surface of the foaming framework; the compounding microbial liquid is composed of polyphosphorus bacteria fermentation liquor, nitrifying bacteria fermentation liquor, denitrifying bacteria fermentation liquor and Rhodospirillum rubrum fermentation liquor in a certain volume ratio. By adding the treatment agent into a sequencing batch reactor at a certain volume filling rate, the chemical oxygen demand, ammonia nitrogen and total phosphorus in the river sewage can be efficiently removed; meanwhile, the magnetic response performance of the treatment agent can realize rapid recovery and reuse, and further reduces the treatment cost.

The application discloses a shewanella extracellular polymer coated nano-iron material and a preparation method and application thereof, and the method comprises the following steps: after commercially available shewanella is recovered, the shewanella is expanded to a nutrient broth culture medium, and after the shewanella grows to a stable period, the bacterial liquid is washed and centrifuged, and the extracellular polymer (EPS) of the shewanella is extracted by heating. Nano-iron (nZVI) powder prepared by ball milling is added to the EPS solution, and after stirring and mixing, the EPS coated nZVI material (EPS@nZVI) is prepared. The EPS@nZVI is added to a continuous flow denitrification tank or a sequencing batch reactor for treating low carbon-nitrogen ratio sewage and is uniformly mixed and reacted, water samples are taken out, and the concentration changes of nitrate nitrogen and the toxicity of the EPS@nZVI to microorganisms are detected. In order to solve the defects of low electron utilization efficiency of nZVI in treating low carbon-nitrogen ratio wastewater and relieve the toxicity of nZVI to microorganisms, the EPS@nZVI prepared based on nZVI and shewanella EPS not only retains the strong reducibility of nZVI, but also has the potential of EPS promoting extracellular electron transfer, reduces the biological toxicity of nZVI, and has high reduction efficiency of nitrate and is easy to recycle.

The present application belongs to the field of oligocarbon source sewage biological treatment technology, in particular to a device and method for fermentation enhanced sewage denitrification and phosphorus removal and sludge reduction, comprising a main stream sewage treatment system and a side stream sludge fermentation system, wherein the main stream sewage treatment system comprises a sequencing batch reactor of cyclic activated sludge method (CASS); a partition plate with water passing holes is arranged in the sequencing batch reactor, and the sequencing batch reactor is divided into a pre-mixing zone and a main reaction zone by the partition plate with water passing holes; the device has a high-efficiency side stream enhancement effect, the side stream sludge treatment capacity is small (only 3% to 20% of the side stream flow rate is used to treat the sludge), and the treatment time is short (the sludge fermentation time is less than 96 h); no chemicals need to be added, and pH and heating need not be controlled during the fermentation process; only anaerobic fermentation of the refluxed sludge at room temperature can improve the main stream denitrification and phosphorus removal efficiency, reduce the total nitrogen and total phosphorus in the effluent, realize the denitrification and phosphorus removal treatment of oligocarbon source (COD / TN<8) municipal sewage to meet the standards, and has the characteristics of economy and high efficiency.