31results about How to "Increase water depth" patented technology

The invention discloses a deformed inverse step rectifying energy dissipation method and a stilling basin. A continuous inverse step tail on a bottom plate is adopted instead of the conventional tail body type, and water current is collided with inverse steps hierarchically, so that energy is dissipated hierarchically, water current collision, doping and a fluctuation flow state before drainage are enhanced, and collision energy dissipation is realized; a vertical drop is arranged at a front-end inlet; side walls on both sides are asymmetrically diffused towards a river heart side curved surface, and the edges of each step are arranged in a continuous L or saw-tooth form, thereby forming transverse and longitudinal three-dimensional deformed inverse step structures being lower at the inlets, higher at the outlets, lower on the river heart sides and higher on the near-bank sides, so that a hydraulic jump energy dissipation flow state is formed forcibly in the basin. Meanwhile, water current is fully diffused transversely and is guided towards the river heart side, so that the basis length can be shortened effectively, the energy dissipation rate is increased, the effects of dissipating energy and adjusting the flow speed distribution are achieve, water current discharged out of the basin returns into a groove smoothly, and downstream erosion is relieved. The deformed inverse step rectifying energy dissipation method and the stilling basin are suitable for a water flow state with low water head, large unit width flux (particularly greater than m<2> / s) and low Fr number (particularly Fr number is smaller than 2).

The invention relates to the technical field of aquatic product aquaculture, in particular to a phycomycete water prawn circulating aquaculture system. The system comprises an aquaculture pond and a water treatment device, wherein a roof which is provided with an illumination intensity adjustable facility and covers the upside of the aquaculture pond is arranged above the aquaculture pond; the pool bottom of the aquaculture pond is gradually inclined from the periphery to the middle; a drainage port is formed in the middle of the pool bottom; an aquaculture area of the aquaculture pond is 400-1,000m<2>; the aquaculture pond is a circle or a chamfered square; the water treatment device consists of a water outlet well, a filter groove, a water return well, a circulating water pump and foam air floatation towers sequentially; the drainage port is connected with the water outlet well by a pipeline; the water outlet well is sequentially connected with the filter groove, the water return wall and the circulating water pump; the circulating water pump is connected with the foam air floatation towers by pipelines; and the foam air floatation towers are connected with tangent water distribution pipes arranged at the periphery of the aquaculture pond by pipelines. The system has the characteristics of low cost, low energy consumption, automatic purification, high yield and the like, and can be widely applied to the industry of intensive aquaculture.

The present invention relates to a sewage treatment process by adopting improved alternative type active sludge method. Said sewage treatment process utilizes the equipments of treatment tank, anaerobic chamber, anoxybiontic chamber, aeration tank and flocculation precipitation tank, etc. and alternatively adopts the process steps of stirring, aeration, concentration, sludge reflus, mixing, flocculation, precipitation and biological dephosphorization, etc. so as to attain the goal of purifying sewage.

The invention relates to a zanjon air lifting pushing solid circulation inversion A<2>O integrated construction oxidation ditch, which comprises an anoxic zone, an anaerobic zone, an aerobic zone provided with a millipore aerator group and an inversion A<2>O integrated construction oxidation ditch of a solid and liquid separating zone. The solid and liquid separating zone is arranged at the front end of a main ditch, the anaerobic zone is arranged at the tail end of the main ditch, and water inlets are respectively arranged at the front ends of the aerobic zone and the anaerobic zone. The integrated construction oxidation ditch is characterized in that a horizontal partition board which divides the main ditch into an upper groove layer and a lower groove layer is arranged at the middle-lower part of the main ditch, the aerobic zone and the anaerobic zone are respectively arranged at the upper groove layer and the lower groove layer, the aerobic zone is internally provided with n (n is more than or equal to 1) aeration lifting zone (s) which is (are) composed of an inlet water-retaining wall, an outlet water-retaining wall and the millipore aerator group and is (are) provided with a lower water inlet and an upper water outlet, the horizontal partition board of a first grade aeration lifting zone is provided with a plurality of lifting holes, and the aerobic zone is internally divided into n aerobic reaction zone (s) corresponding to the aeration lifting zone (s).The integrated construction oxidation ditch has the advantages that: the yielding water quality, particularly the dephosphorization and denitrification effect, is better, the occupation area is reduced, the equipment is reduced, the operation is simplified, and the operation cost is lowered.

The invention relates to a riser pipe installation that comprises a flexible duct of the non-bound type, the duct being vertically arranged between a mechanical connection with a submerged buoy at the stub on the one hand, and a mechanical connection with the seabed at the bottom on the other hand, wherein fluid connections are provided at the stub and at the bottom for connecting the riser pipe with surface equipment on the one hand and bottom equipment on the other hand; the bottom of the pipe is located at a depth of at least 1000 m where it is submitted to a computable maximum reverse bottom effect F, while the buoy is oversized in order to generate at the bottom of the riser pipe a reaction tension T higher than at least 50% or even 100% of the computable maximum reverse bottom effect F applied at the bottom of the pipe.

The invention discloses a jacket offshore wind turbine foundation with brackets. The jacket offshore wind turbine foundation with the brackets comprises a jacket, foundation piles, bracket flanges and the construction brackets, wherein the foundation piles are arranged in guide pipes of the jacket and extend to be embedded into a foundation; the bracket flanges are arranged on the guide pipes; and the construction brackets are connected with the guide pipes through the bracket flanges. According to the jacket offshore wind turbine foundation with the brackets, a temporary supporting system is formed through auxiliary piles constructed in advance, the jacket is placed on the supporting system in a suspended mode through the construction brackets, then the guide pipes of the jacket serve as a positioning guiding device so that the foundation piles can be piled, and finally grouting connection is conducted on the foundation piles and the guide pipes. By the adoption of the jacket offshore wind turbine foundation with the brackets, structure fixing and stabilizing of the suspended jacket during the construction period are achieved; positioning, guiding, pile clamping and the like of offshore construction of the foundation piles are achieved; and in addition, the height of the jacket can be reduced, and steel materials are saved. The structure is easy and convenient to construct, good in feasibility and suitable for areas with large water depths and thick covering layers and has broad application prospects in offshore wind power projects. The invention further discloses a construction method of the jacket offshore wind turbine foundation with the brackets.

The present invention belongs to the sewage treating apparatus adopting biochemical technology. The integrated stereo oxidation channel has two rectangular solid-liquid depositing separators, and the oxidation channel is separated with partition board into the upper aerobic area and the lower anaerobic area. Each of the solid-liquid depositing separators has inclined mixed liquid inlet in the bottom, overflow weir and water outlet on one side wall, and sludge reflowing port on the other wall. The two solid-liquid depositing separators are installed separately on two side walls of the stereo circulating oxidation channel. The stereo circulating oxidation channel has bottom isolated from air and this is favorable to forming anaerobic state and raising denitrifying efficiency. Compared with available oxidation channel, the present invention has 50 % reduced covered area.

The invention discloses an improved integrated oxidation ditch which is characterized in that an A2O process, an annular oxidation ditch and a secondary sedimentation tank are combined fully.The oxidation ditch achieves the intermittent aerobic and anoxic process, the center of a round reaction tank is provided with a radial flow type sedimentation tank, an anaerobic reaction tank is added to an air inlet of the oxidation ditch and is subject to combined construction together with the oxidation ditch, sludge flows back to the anaerobic reaction tank, and micropores are adopted for aeration so as to overcome the shortcomings that an ordinary oxidation ditch is small in water depth, low in aeration power efficiency and high in energy consumption.The improved integrated oxidation ditch has the advantages that the oxidation ditch is stable in treatment effect, good in nitrogen and phosphorus removal effect, stable in outlet water quality and resistant to impact load, the space occupied by a treatment facility is small, per ton water investment is saved, and the running cost is low; and the improved integrated oxidation ditch is suitable for small and medium sewage treatment plants having the nitrogen and phosphorus removal requirements.

The invention relates to a biochemical treatment and sedimentation integrated central sedimentation type active sludge biochemical treatment device, wherein the upper part in a shell is provided with an annular overflow trough with water inletting from two sides and a despin mechanism positioned below the annular overflow trough, the lower part of the shell is inverted frustum shaped, the bottom is provided with a sludge discharge port, the middle part is provided with a sedimentation cylinder with open upper and lower ends, and the upper end of the sedimentation cylinder is inverted umbrella shaped; an interspace for forming a sedimentation overflow area is reserved between the upper end of the sedimentation cylinder and the top of the shell, an interspace for forming a sludge area is reserved between the lower end of the sedimentation cylinder and the bottom of the shell, an interspace for forming a rotational flow passage is reserved between the outer wall of the sedimentation cylinder and the inner wall of the shell, and the part of the shell positioned in the sludge area is inverted frustum shaped; and a jet pipe of a high-efficiency aerator is connected into the shell along the tangential direction of the shell and is communicated with the inner space of the shell. The biochemical treatment and sedimentation integrated central sedimentation type active sludge biochemical treatment device forms ascending rotational flows in the shell, effectively improves the mixed mass transferring capacity, has high active sludge concentration and good purification effect, allows deeper water depth, and is mainly applied to the aerobic biochemical treatment of organic sewage.

The invention provides a low-energy coastal beach restoration design method. The method comprises the steps of constructing an outwards- protruding beach berm outer edge line, determining the transverse-to-longitudinal ratio of the beach berm outer edge line, determining the beach surface gradient, supplementing sand, determining a dredging area and dredging depth, and building a sand blocking dam. According to the method, the characteristic that waves gather on the headland in an auxiliary manner is utilized, the outwards-protruding headland-shaped beach berm outer edge line is constructed through a manual means, the needed beach face range and gradient are determined according to the outwards-protruding beach berm outer edge line, and sand supplementing is performed; when the beach is repaired, desilting is performed on the periphery of the beach face, the outwards-protruding near-shore terrain is constructed while a muddy material source is reduced and the near-shore water depth isincreased, the wave energy of the repaired position is effectively improved, and the situation of beach argillization of the low-energy coast is improved.

The invention belongs to the field of water environment protection, and particularly provides an ammonia-adsorption-based improved SBR biological nitrogen and phosphorus removal system and method for low-carbon-source sewage. The method is an improvement to a traditional SBR technology, and comprises the steps of (1) adding a powdery adsorbent in the system to promote ammonia adsorption of sludge and the adsorbent and to promote settling of the sludge at the same time; (2) additionally adding an anaerobic tank; and (3) changing a specific operating procedure of an original SBR. Sewage enters an SBR reaction tank after running through the anaerobic tank, and a circulating procedure of the SBR reaction tank comprises (1) water ingress, (2) oxygen deprivation, (3) sedimentation and water discharging, and (4) aeration. The most important difference between an SBR operating procedure part of the method and the traditional SBR is as follows: firstly, the front-end anaerobic tank is added, secondly, sedimentation and water discharging are conducted immediately after the oxygen deprivation procedure is carried out, and aeration is conducted on the sludge which is obtained after sedimentation and water discharging are conducted. The method is suitable for municipal sewage with a low carbon-nitrogen ratio, moreover, the nitrogen and phosphorus removal efficiency is high, the technology is simple, and energy consumption is low.

The invention relates to a biochemical treatment and sedimentation integrated backflow type active sludge biochemical treatment device, which comprises a cylindrical shell and a high-efficiency aerator, wherein a backflow cylinder with open upper and lower ends is arranged in the shell, an interspace for forming a sedimentation overflow area is reserved between the upper end of the backflow cylinder and the top of the shell, an interspace for forming a sludge area is reserved between the lower end of the backflow cylinder and the bottom of the shell, an interspace for forming a rotational flow passage is reserved between the outer wall of the backflow cylinder and the inner wall of the shell, a jet pipe of the high-efficiency aerator is connected into the shell along the tangential direction of the shell and is communicated with the space inside the shell, and the joint part corresponds to the lower part of the backflow cylinder. The biochemical treatment and sedimentation integrated backflow type active sludge biochemical treatment device forms backflows in the shell, effectively improves the mixed mass transferring capacity, has high active sludge concentration and good purification effect, allows deeper water depth, and is mainly applied to the aerobic biochemical treatment of organic sewage.

The invention relates to a device for securing floating bodies (1), in particular platforms and boats, comprising at least one floating dock (2) with at least one buoyancy element (3), a path structure (4), and a framework-like underwater structure (5). In order to provide advantageous disembarkation conditions, the path structure (4) and the framework-like underwater structure (5) of the floating dock (2) are connected to each other via pendulum supports (6) and are braced via pulling means (7), in particular cables and / or claims.

The invention provides a large reservoir sounding reference field construction method and application. The method comprises the steps of reference field site selection: in order to meet the calibration technical requirements of various sounding devices, arranging reference points and reference surfaces in various forms, constructing a reference point, and constructing a reference plane. Research on sounding errors, positioning errors and water level correction errors can be carried out on the basis of the sounding reference point, including the nominal precision of a depth finder, the sounding mode, the actual sounding depth and the dynamic draft influence, positioning precision, GNSS data updating rate, difference method influence and the like, a water level calculation model and the like. Based on the depth sounding reference surface, depth sounding environment error research and GNSS three-dimensional water channel depth sounding precision research can be carried out. The influence research includesa wave effect, a positioning center deviation effect, a single-beam sounding attitude effect, a sounding delay effect, a ship speed effect, a beam angle effect, a coupling effect, water body characteristics, sounding sampling frequency and smoothing mode, sound ray tracking and multi-beam sounding system sounding point cloud precision analysis.

The invention embodiment discloses an improved Orbal oxidation ditch. The improved Orbal oxidation ditch comprises an anaerobic tank, an anoxic tank, and an aerobic tank from the outside to the insidesuccessively; the external wall of the anaerobic tank is provided with a sewage inlet and a backflow sludge port; the improved Orbal oxidation ditch also comprises aeration machines and adjustable flow guide devices; the aeration machines are arranged in each tank, adjustable flow guide devices are arranged in each tank at the downstream of corresponding aeration machines. The improved Orbal oxidation ditch is capable of realizing appropriate increasing of water depth, adjusting flow speed, is high in dissolved oxygen efficiency, and is reliable in structure; and no deposition blind angle isformed.

A ship lift navigable ship draft standard improving method actively utilizes a ship lift docking locking mechanism to bear large unbalanced load, when a ship chamber is docked, the threshold water depth of a ship lift lock head working door is increased, meanwhile, the docking elevation of the ship chamber is reduced to make the ship chamber water level lower than an approach channel water level,and the ship chamber is filled with water through a ship chamber water depth adjusting device to make the water level flush with the approach channel water level, so after docking, the water depth ofthe ship chamber is increased, conditions are provided for improving the draft standard of the ship, and load change caused by increase of the water depth of the ship chamber is borne by the docking locking mechanism; when docking of the ship chamber is relieved, the ship chamber is drained through the ship chamber water depth adjusting device, and the water depth of the ship chamber is reduced toa designed water depth, so it is guaranteed that the lifting load of the ship lift is not changed, and normal lifting operation is not affected. The method is ingenious and easy to implement, and theship draft standard improving effect is remarkable.

The invention relates to a device for securing floating bodies (1), in particular platforms and boats, comprising at least one floating dock (2) with at least one buoyancy element (3), a path structure (4), and a framework-like underwater structure (5). In order to provide advantageous disembarkation conditions, the path structure (4) and the framework-like underwater structure (5) of the floating dock (2) are connected to each other via pendulum supports (6) and are braced via pulling means (7), in particular cables and / or claims.

The invention discloses a siphon type wall-mounted pedestal pan with a water tank. The siphon type wall-mounted pedestal pan comprises a pedestal pan body, wherein a urinal and the water tank are arranged on the pedestal pan body; and a water sinking bay is arranged at the bottom of the urinal, and the water sinking bay is connected with a siphon. A scrubbing pipeline is arranged at the top of theurinal; and one side of the scrubbing pipeline communicates with the water tank. A spraying pipeline is arranged in the pedestal pan body, a drain valve mounting hole used for being communicated withthe spraying pipeline is formed in the bottom of the water tank, a spraying opening is formed in the side wall of the water sinking bay, and the bottom of the spraying pipeline is communicated with the spraying opening. The siphon is arranged on the side, away from the wall, in the pedestal pan body, and the water inlet is opposite to the jet orifice. A sewage discharging channel is arranged at the lower portion inside the pedestal pan body, a sewage discharging opening is formed in the side, close to the wall, of the pedestal pan body, one end of the sewage discharging channel is connected with a siphon water outlet, and the other end is connected with the sewage discharging opening. The wall-mounted pedestal pan is provided with the water tank, and the pipeline is convenient to maintain; and pollution discharge is conducted in a siphon mode, and the pollution discharge effect is good; and the size of the pedestal pan is reduced due to the front siphon.

The invention relates to an intelligent barrier net aquaculture substrate blow-down system and method, and mainly relates to the field of seawater barrier net aquaculture. The system comprises a system control module, a wireless communication module, a water environment monitoring module, a blow-down treatment module, a position detection module, a terminal module, a barrier net and bottom mud inthe shape of a 'pointed bottom'. The invention further provides the blow-down method based on the system. The method includes the steps: detecting the flow speed and the water level of water; startingthe blow-down treatment module to work, accordingly cleaning sea bottom mud in an area with the barrier net into the shape of the 'pointed bottom', and then discharging dirt to open sea by tidal water flow when tide falls by one-third to two-thirds and the shape of the bottom mud reaches a set upper limit range; stopping work of the blow-down treatment module when the shape of the bottom mud reaches a set lower limit range. By the aid of the 'pointed bottom' shape of the bottom mud, water depth is increased, and pollution and energy consumption are reduced.

The invention provides a reverse slope type apron. The apron comprises a stilling pool apron section, a sea overtopping section and a big stone backfilling section; the sea overtopping section is arranged in a reverse slope type sea overtopping section manner; the scouring damage of water flowing out of a pond to the sea overtopping section is reduced; the flowing speed of water flowing out of thepond is reduced; a water surface line is smoothly connected with a downstream river channel; the vertical component speed of water flow flowing out of the pond is reduced; the water depth at the outlet of the stilling pool is increased, the overall stability of the stilling pool is improved, the depth of a water cushion in the stilling pool is increased, the energy dissipation rate is increased,the water surface line becomes gentle, water flow can better return to a groove, the stilling pool and the overall anti-scoring performance of the sea waves are improved, and the flow state of downstream water flow is greatly improved.

The invention discloses a tower type aerobic reactor which comprises a body and an aeration header pipe, and a water inlet pipe, a return sludge pipe and an effluent weir are arranged at the top of the body; the water inlet pipe and the return sludge pipe extend to the bottom of the body; a water outlet pipe is arranged on the effluent weir; a nitrification liquid inlet pipe and a sludge outlet pipe are arranged at the bottom of the body; a nitrification liquid outlet pipe is arranged between the nitrification liquid inlet pipe and the water inlet pipe, and the nitrification liquid outlet pipeand the nitrification liquid inlet pipe are respectively connected with a nitrification liquid internal circulation pump; a sludge inlet pipe is arranged between the sludge outlet pipe and the returnsludge pipe, and the sludge inlet pipe and the sludge outlet pipe are respectively connected with a sludge internal circulation pump; an aeration branch pipe is arranged on the aeration header pipe,and a liftable aerator is arranged at the end part of the aeration branch pipe; and the aeration branch pipes extend into the body from the top of the body. By the arrangement, high water depth, highoxygen utilization rate, high treatment capacity, sufficient contact reaction and low energy consumption can be realized.

The invention discloses an upward flow circular oil separation pretreatment device which mainly comprises a water inlet and distribution system, a bottom mud scraping mechanism, a surface oil and slag scraping mechanism and a water outlet area. A water distribution barrel 2 is employed for center water inlet; a diversion cone 3 uniformly distributes water around; and floating oil and dispersion oil in water are collected by using a density difference between the oil and the water. A surface oil skimmer 12 is matched with a floating slag hopper 13, so that the concentration of the collected floating oil can reach 20%. A mud scraper 6 is arranged at the bottom to concentrate precipitated oil sludge, the concentration of the concentrated sludge can reach 80-100g / L, and sludge thickening is not required. A designed upflow rate of the oil separation pretreatment device can reach 4m / h, and the floor area is saved. The device is widely applicable to a pretreatment stage of oily sewage and can achieve oil and suspended matter effluent of less than 100mg / L synchronously.

The invention discloses a deformed inverse step rectifying energy dissipation method and a stilling basin. A continuous inverse step tail on a bottom plate is adopted instead of the conventional tail body type, and water current is collided with inverse steps hierarchically, so that energy is dissipated hierarchically, water current collision, doping and a fluctuation flow state before drainage are enhanced, and collision energy dissipation is realized; a vertical drop is arranged at a front-end inlet; side walls on both sides are asymmetrically diffused towards a river heart side curved surface, and the edges of each step are arranged in a continuous L or saw-tooth form, thereby forming transverse and longitudinal three-dimensional deformed inverse step structures being lower at the inlets, higher at the outlets, lower on the river heart sides and higher on the near-bank sides, so that a hydraulic jump energy dissipation flow state is formed forcibly in the basin. Meanwhile, water current is fully diffused transversely and is guided towards the river heart side, so that the basis length can be shortened effectively, the energy dissipation rate is increased, the effects of dissipating energy and adjusting the flow speed distribution are achieve, water current discharged out of the basin returns into a groove smoothly, and downstream erosion is relieved. The deformed inverse step rectifying energy dissipation method and the stilling basin are suitable for a water flow state with low water head, large unit width flux (particularly greater than m<2> / s) and low Fr number (particularly Fr number is smaller than 2).

The invention relates to a zanjon air lifting pushing solid circulation integrated construction oxidation ditch, which comprises an anoxic zone, an anaerobic zone, an aerobic zone provided with a millipore aerator group and an integrated construction oxidation ditch of a solid and liquid separating zone, wherein, the anoxic zone is arranged at the front end of a main ditch. The integrated construction oxidation ditch is characterized in that a horizontal partition board which divides the main ditch into an upper groove layer and a lower groove layer as well as is left with channels at the front and the back is arranged at the middle-lower part of the ditch body between the ditch walls at the tail ends of the anoxic zone and the main ditch, the aerobic zone is arranged at the upper groove layer and the tail end of the main ditch and is provided with n (n is more than or equal to 1) aeration lifting zone (s) which is (are) composed of an inlet water-retaining wall, an outlet water-retaining wall and the millipore aerator group and is (are) provided with a lower water inlet and an upper water outlet. The aerobic zone is internally provided with n aerobic reaction zone (s), and the solid and the liquid separating zone is arranged between the anaerobic zone and the nth aerobic reaction zone. The lower groove layer is the anoxic zone. The integrated construction oxidation ditch has the advantages that: better anoxic, anaerobic, aerobic, and solid and liquid separating environments are created, the total dephosphorization and the total denitrification effects are improved, the yielding water quality is better, the occupation area is reduced, and the construction and the operation costs are lowered.

The invention provides a construction method and application of a large-scale reservoir sounding reference field. The location of the reference field: in order to meet the calibration technical requirements of various sounding equipment, it is necessary to lay out various forms of reference points and reference surfaces; reference point construction; reference surface construction. Based on the sounding reference point, it is possible to conduct research on sounding error, positioning error, and water level correction error, including the nominal accuracy of the sounding instrument, sounding method, actual depth of sounding, and the influence of dynamic draft; positioning accuracy, GNSS data update rate, and differential method Influence, etc.; water level reckoning model, etc. Based on the sounding datum, it is possible to conduct research on the sounding environment error and GNSS three-dimensional channel sounding accuracy, including wave effects, positioning center deviation effects, single-beam sounding attitude effects, sounding delay effects, ship speed effects, beam angle effects, Coupling effect, water body characteristics, bathymetry sampling frequency and smoothing method, sound ray tracking, and multi-beam bathymetry system bathymetry point cloud precision analysis and other impact studies.

The invention relates to a zanjon air lifting pushing solid circulation inversion A<2>O integrated construction oxidation ditch, which comprises an anoxic zone, an anaerobic zone, an aerobic zone provided with a millipore aerator group and an inversion A<2>O integrated construction oxidation ditch of a solid and liquid separating zone. The solid and liquid separating zone is arranged at the frontend of a main ditch, the anaerobic zone is arranged at the tail end of the main ditch, and water inlets are respectively arranged at the front ends of the aerobic zone and the anaerobic zone. The integrated construction oxidation ditch is characterized in that a horizontal partition board which divides the main ditch into an upper groove layer and a lower groove layer is arranged at the middle-lower part of the main ditch, the aerobic zone and the anaerobic zone are respectively arranged at the upper groove layer and the lower groove layer, the aerobic zone is internally provided with n (n ismore than or equal to 1) aeration lifting zone (s) which is (are) composed of an inlet water-retaining wall, an outlet water-retaining wall and the millipore aerator group and is (are) provided with a lower water inlet and an upper water outlet, the horizontal partition board of a first grade aeration lifting zone is provided with a plurality of lifting holes, and the aerobic zone is internally divided into n aerobic reaction zone (s) corresponding to the aeration lifting zone (s).The integrated construction oxidation ditch has the advantages that: the yielding water quality, particularly thedephosphorization and denitrification effect, is better, the occupation area is reduced, the equipment is reduced, the operation is simplified, and the operation cost is lowered.

The present invention relates to the technical field of aquatic product cultivation, in particular to a prawn recirculating aquaculture system in an algae-bacteria water system, comprising: a culture pond, a facility with adjustable light intensity is arranged above the culture pond and covers the roof above the culture pond, and the pond of the culture pond The bottom gradually inclines from the surroundings to the center and there is a drainage port in the center of the bottom of the pool. The breeding area of ​​the breeding pond is 400-1000m2, and the breeding pond is a round or chamfered square; the water treatment device consists of a water outlet well, a filter tank, It is composed of a return well, a circulating water pump and a foam air flotation tower. The outlet is connected to the water outlet well through a pipeline, and the water outlet well is connected to the filter tank, the return water well and the circulating water pump in turn. The air flotation tower is connected with the tangential water distribution pipes arranged around the culture pond through pipelines. The invention has the characteristics of low cost, low energy consumption, self-purification, high output and the like, and can be widely used in intensive aquaculture industry.

The invention discloses an upward flow circular oil separation pretreatment device which mainly comprises a water inlet and distribution system, a bottom mud scraping mechanism, a surface oil and slag scraping mechanism and a water outlet area. A water distribution barrel 2 is employed for center water inlet; a diversion cone 3 uniformly distributes water around; and floating oil and dispersion oil in water are collected by using a density difference between the oil and the water. A surface oil skimmer 12 is matched with a floating slag hopper 13, so that the concentration of the collected floating oil can reach 20%. A mud scraper 6 is arranged at the bottom to concentrate precipitated oil sludge, the concentration of the concentrated sludge can reach 80-100g / L, and sludge thickening is not required. A designed upflow rate of the oil separation pretreatment device can reach 4m / h, and the floor area is saved. The device is widely applicable to a pretreatment stage of oily sewage and can achieve oil and suspended matter effluent of less than 100mg / L synchronously.