34 results about "Anoxic waters" patented technology

The invention discloses a mainstream short-range nitrification and denitrification / anammox system and method, belonging to the technical field of water treatment. Sewage undergoes chemical flocculation and precipitation to capture particulate organic matter, colloidal organic matter and phosphorus; followed by anaerobic hydrolysis and acidification, the organic matter in the wastewater is decomposed into volatile fatty acids and ammonia nitrogen. The next stage is the multi-cycle SBR pool. Through multi-step water inflow and multi-step A / O reaction, denitrification / anaerobic ammonium oxidation is strengthened, nitrite nitrogen is removed in time, and nitrifying bacteria (NOB) substrate deficiency is formed, supplemented by dissolution Oxygen online control and short sludge age eliminate NOB bacteria to achieve stable mainstream short-cut nitrification and denitrification / anammox denitrification. The short-cut nitrification rate of the multi-circulation SBR tank is above 80%, and the removal rates of COD, ammonia nitrogen and TN are 87%, 98% and 88% respectively. The method has the advantages of simple control strategy, strong automation, low energy consumption, less greenhouse gas emissions, good effluent quality, and low sludge output.

The application relates to a method for remediation and / or restoration of an anoxic body of water (10), wherein a calcium nitrate solution (3) is added to the anoxic body of water (10), and the methodcomprises the steps of mixing water having a percent of oxygen saturation of between 50% and 150% with the calcium nitrate solution (3), resulting in a mixture, and pumping the mixture into the anoxic body of water (10), wherein the final concentration of nitrate-N in the remedied and / or restored anoxic body of water (10) is between 1 and 20mg / l. The application furthermore relates to a system (1) for remediation and / or restoration of an anoxic body of water (10), wherein the system (1) is provided with means to add a calcium nitrate solution (3) to the anoxic body of water (10), wherein themeans to add the calcium nitrate solution (3) to the anoxic body of water (10) consists of a mixing device (2) arranged to mix the calcium nitrate solution (3) with water having a percent of oxygen saturation of between 50% and 150%, resulting in a mixture, and wherein the system (1) comprises first pumping means (5) for pumping the mixture into the anoxic body of water (10).

The invention discloses a tidal rage type manual downwelling device, and belongs to the technical field of marine anoxia. The tidal rage type manual downwelling device comprises an upper water storagetank, electromagnetic valves, downwelling vertical pipes, mixers and a lower drainage tank; the upper water storage tank is communicated with the lower drainage tank through at least one downwellingvertical pipe; one electromagnetic valve is arranged on each downwelling vertical pipe; the mixers are arranged on the inner side wall of the lower drainage tank; and the side wall of the lower drainage tank is provided with drain outlets. According to the tidal rage type manual downwelling device, the problem of seabed anoxia can be solved by utilizing the tidal range to generate downwelling; during the flood tide, the electromagnetic valves are closed, and the upper water storage tank stores water; after the tide ebbs and is static for a period of time, water in the upper water storage tankreaches the salinity close to that of bottom seawater after the evaporation temperature of the water in the upper water storage tank is increased, and then the electromagnetic valves are opened to form downwelling; and oxygen-enriched water in the upper water storage tank and anoxic water in the lower drainage tank are fully mixed under the action of the mixers and are discharged through the drainoutlets in the wall of the lower drainage tank, and the discharged oxygen-enriched water is mixed with the surrounding anoxic water so as to alleviate the anoxia problem under the sea.

The invention discloses an underwater swimming type jet oxygen-increasing machine. The underwater swimming type jet oxygen-increasing machine is characterized by comprising an underwater pump positioned below the water surface of a water body, a supporting plate for supporting the underwater pump, a positioning float bowl for adjusting the depth of the underwater pump, a positioning anchor for keeping the underwater pump at a selected position in the water body and a waterproof trailing cable with adjustable length for controlling an underwater swimming radius of the underwater pump. A middleopening of a three-way valve on the underwater pump is communicated with a water outlet of the underwater pump; the openings at both sides of the three-way valve on the underwater pump are respectively communicated with a sector diversion tube; the sector diversion tube is provided with a plurality of jet devices uniformly distributed along the radial direction; the jet devices are provided with air inlet tubes the openings of the upper end of which extend from the water surface; and the positioning anchor is positioned at the middle zone of the water body. The invention has the advantages ofbeing capable of solving low energy oxygenation of anoxic water at the middle and bottom layers with a large scope, pushing the water body to do circular motion simultaneously, and generating downwelling and vertical convection so as to improve circulation of the water body and ecological restoration and realize pumping function.

The invention discloses a curtain type manual down-flow device combined with fish reefs, and belongs to the technical field of ocean anoxia solving; the curtain type manual down-flow device comprisesfloating balls, ropes, curtain cloth, a steel fixing frame, artificial reefs and anchoring structures, wherein the floating balls are connected with the steel fixing frame through the ropes, the curtain cloth is fitted on the steel fixing frame, reinforcing ribs penetrate the steel fixing frame, and the artificial reefs are connected to the bottom of the steel fixing frame and fixed on the seabedthrough the anchoring structures. When oxygen-enriched water entrained by tidal currents flows through the device, a down-flow is generated under the induction of the inclined curtain cloth and is discharged after being mixed by the artificial reefs at the bottom of the device, and the discharged oxygen-enriched water is mixed with surrounding anoxic water so as to alleviate the anoxia problem ofthe seabed.

The invention relates to the technical field of water purification and water oxygenation apparatuses, and especially relates to a porous plate oxygenation apparatus related with oxygen supply of medicine and chemical engineering wastewater treatment, domestic wastewater treatment, agricultural culture oxygenation and fish and shrimp transportation and selling processes and used for dispersing bubbles in water. The apparatus comprises at least two layers of porous plates arranged between a water bottom and a water surface at intervals, the porous plates are arranged on a supporting frame or a pole, a plurality of air holes are distributed on each of the porous plates, the apertures of all the air holes are equal to each other, and the apertures are 0.5-3mm. The porous plate oxygenation apparatus allows bubbles blown into water through an aeration device to be cut and dispersed multiple times, contacts and bumps circulating water in a high density manner, and rapidly changes anoxic water in a water container into water rich in dissolved oxygen.

The invention discloses a mobile oxygenation device for a bottom water body of an aquaculture pond. The oxygenation device comprises a solar power assembly, an upper layer water body extraction assembly, a first floating body and a second floating body, wherein the first floating body is used for bearing the solar power assembly; the second floating body is used for bearing the upper layer water body extraction assembly; the first floating body and the second floating body are connected integrally through a connecting rod; the solar power assembly comprises a solar power generation plate, a solar power source, a guide bracket and a driving motor; and the upper layer water body extraction assembly comprises an upper layer water body extraction barrel and propeller blades. With the adoption of the device, the oxygen production capability of phytoplankton in the pond is used, and supersaturated dissolved oxygen produced by the phytoplankton on the water body surface of the pond at noon is extracted to the anoxic water body at the bottom of the pond and stored, so that the dissolved oxygen content in the whole pond is significantly increased, and problems of oxygen deficiency at the bottom of a traditional pond, water quality stratification and previous insufficient utilization of the oxygen produced by the phytoplankton are solved. The solar plate is used as a power source, and the device is independent of external power sources and electric wires, so that the device can be used normally in unpowered regions.

The invention discloses a denitriding microbial nest based on basalt fiber filling materials and a culture method thereof. The denitriding microbial nest is attached onto a basalt fiber beam, and sequentially comprises an aerobic layer, an anoxic layer, an anaerobic layer and the like from outside to inside. Through the combination of the basalt fiber filling materials, a bioreactor and an aerator, the sewage is treated; the air and active sludge realize the strong mixing through the aerator; an ascending flow is generated; circulation flows are formed at the two sides of the basalt fiber filling materials; under the hydraulic effect, the basalt fiber beam performs coating and support on the active sludge attached onto the surface of the fiber beam; under the layered coverage of the basalt fiber on the active sludge, the spherical or spheroid active sludge microorganism aggregates, i.e., the denitriding microbial nests are gradually formed. The denitriding microbial nests are subjected to domestication culture; the goal of removing nitrogen in the sewage is achieved.

The invention discloses a CoMoO 4 / g‑C 3 N 4 Composite photocatalyst, described photocatalyst is two-dimensional lamellar g-C 3 N 4 A certain amount of CoMoO is loaded on 4 Nanorods; g‑C 3 N 4 On CoMoO 4 The loading amount of nanorods is 5%-15% (mass percentage). The present invention also discloses the above-mentioned CoMoO 4 / g‑C 3 N 4 Preparation method of composite photocatalyst and its application in adsorption and degradation of humic acid in anoxic water. CoMoO of the present invention 4 / g‑C 3 N 4 The composite material has good adsorption and degradation capabilities for humic acid in water under visible light, especially in the presence of persulfate in water, CoMoO 4 / g‑C 3 N 4 It can effectively activate persulfate to generate sulfate radicals, thereby further improving its ability to degrade organic pollutants in water.

The invention discloses a combined emergency treatment method for black and odorous water by forward osmosis, coagulation and anoxic hydrolysis. The black and odorous water is first subjected to three-stage concentration treatment through stepped forward osmosis, and the stepped concentration makes the single-stage flux low and the degree of membrane pollution light. , which can be operated continuously; the drawn liquid diluted in the forward osmosis process is re-concentrated and recycled by reverse osmosis, which can avoid secondary pollution; the volume of concentrated black and odorous water is greatly reduced, and the concentration of organic matter, iron, manganese, etc. is significantly increased, which is effective Reduce treatment capacity and improve efficiency; then remove iron, manganese, suspended solids and colloidal substances in water through coagulation and sedimentation, and anoxic hydrolysis to improve the biodegradability of concentrated water. The effluent finally enters the sewage plant, avoiding aeration and in-situ injection. The disadvantages of conventional methods such as adding coagulants still remain in the water body.